artikel elektronika

Panel LCD

2012-01-25T11:57:00.000-08:00

Pembacaan komponen SMD(surface mount device)

2011-12-08T18:33:00.000-08:00

maaf bahasanya masih asli dari sononya

SMD Ceramic Capacitor Coding

SMD ceramic capacitors are sometimes marked with a code, consisting of one or two letters and a digit. The first
letter if present is a manufacturer code (i.e K for Kemet, etc.), the second letter the mantissa and the digit the
exponent (multiplier) of the capacitance in pF. For example S3 is a 4.7nF (4.7 x 10³ pf) capactitor from an
unknown manufacturer, while KA2 is a 100 pF (1.0 x 10² pF) capacitor from Kemet. Thanks to K7ITM for
providing this information!
Letter Mantissa Letter Mantissa Letter Mantissa Letter Mantissa
A 1.0 J 2.2 S 4.7 a 2.5
B 1.1 K 2.4 T 5.1 b 3.5
C 1.2 L 2.7 U 5.6 d 4.0
D 1.3 M 3.0 V 6.2 e 4.5
E 1.5 N 3.3 W 6.8 f 5.0
F 1.6 P 3.6 X 7.5 m 6.0
G 1.8 Q 3.9 Y 8.2 n 7.0
H 2.0 R 4.3 Z 9.1 t 8.0
y 9.0

SMD Electrolytic Capacitor Coding

SMD electrolytic capacitors are often marked with their capacitance and working voltage, e.g.
10 6V is 10 μF 6V . Sometimes a code is used instead, which normally consists of a letter and
3 digits. The letter indicates the working voltage and the 3 digits (2 digits and multiplier) give
the capacitance in pF.
The band or stripe indicates the positive terminal.
For example, a capacitor marked A475 is a 4.7μ F 10V unit.
475 = 47 x 10*5 pF = 4.7 x 10*6 pF = 4.7μ F

Letter Voltage
e 2.5
G 4
J 6.3
A 10
C 16
D 20
E 25
V 35
H 50

SMD Resistor Coding

SMD Resistors are usually coded with a numerical equivalent of the familiar three
band colour code. In the same way as wire ended components, precision resistors
(1% or better) may be marked with a four digit code.
The first two (or 3) digits are the first two (or 3) digits of the resistance in ohms, and

the third(or 4th) is the number of zeros to follow - the 'multiplier'.
Resistances of less than 10 ohms have a 'R' to indicate the position of the decimal
point.
Some examples will meake this clearer:
Three Digit Examples Four Digit Examples
330 is 33 ohms - not 330 ohms 1000 is 100 ohms - not 1000 ohms
221 is 220 ohms 4992 is 49900 ohms, or 49.9 kohm
683 is 68000 ohms, or 68 kohm 16234 is 162000 ohms, or 162 kohm
105 is 1000000 ohms, or 1 Mohm
8R2 is 8.2 ohms 0R56 or R56 is 0.56 ohms

tv sanyo

2011-04-17T01:02:00.000-07:00

lama ndak pernah update, kali ini baru nengoki blog................
model tv kali ini adalah tv sanyo type CG14CE1, IC prog/croma QXXAVC896...M(SMD).
impedansi yoke HOR 9,2 ohm, Vert 29,2 ohm.
problemnya : Raster cuma beberapa cm di tengah......seperti yg nampak di gambar.
sebenarnya dari pertama sdh curiga sama yoke nya, iseng2 saya pasang yoke tv panasonic
tv coba dinyalakan ..........led indikator malah kedip2 layar ndak mau buka.
lha dalah TR hor malah putus....................brarti yoke nya ndak sama, setelah saya ukur yoke tv panasonic impedansi HOR 3,1 ohm, Vert 15,2 ohm.
kemudian saya sharing di klinik tv , rata2 rekan2 menyarankan membongkar yoke nya.
dengan posisi tr hor masih terlepas saya coba ukur sekali lagi teg B+ nya dengan beban Bolam.
pada saat pengukuran yoke vertikal bagian atas kok berderik dan hangat sedang bagian bawah dingin2 aja......
dari hasil diatas saya coba bongkar yokenya.......dan memang benar yoke yang dingin memang putus.
kebetulan ada yoke bekas tv sharp yg rusak bagin hor nya maka saya ambil bagian vert nya dan saya pasang pada yoke sanyo.
setelah terpasang tv saya hidupkan ............pyar....gambar mau tampil normal di layar.
impedansi yoke sanyo setelah dikanibal tadi impedansi terukur Hor 9,2 ohm, vert 16,2 ohm.
demikian semoga bermanfaat bagi yang lain.......

TV AKARI blue beach

2010-10-15T15:56:00.000-07:00

keluhan dari tv ini yaitu gambar bagus tapi suara noise. Tv ini menggunakan IC prog PTCS030201 dan IC croma LA 76810.
langkah yg saya lakukan adalah masuk SERMOD dengan menekan MENU(TV)+SLEEP(remote), memang data sif sys terubah ke 6,0mhz yang seharusnya 5,5mhz.
setelah merubah ke 5,5mhz suara normal tapi begitu keluar dari sermod suara kembali noise lagi..ada apa ini????????????
rupanya ic memory tidak mau safe data yang telah saya rubah tadi.....akhirnya meluncur ke toko nanya ic memory akari yang sudah di flash......alhamdulillah ada.
langsung pasang .....auto search untuk cari cannel........jreng suara timbul.
cuma gambar agak ketinggian sedikit, masuk sermod lagi atur Vsize.....ok deh.

dibawah ini datanya
00
osd contrast 60
sub bright 80
sub contrast 55
sub collor 63
sub tint 80
sub sharp 50

01
red bias 127
green bias 160
blue bias 140
red drive 63
green drive 8
blue drive 63

02
V pos/50mhz 10
V pos/60mhz 20
Vsize/50mhz 58
Vsize/60mhz 90
Vsc 18
Vlinearity 15
Vsize CMP 6

03
H freq 20
H phase/50mhz 10
H phase/60mhz 13
H blk L 2
H blk R 5
blank def 0
coring enable 0

04
collor sya 2
sif sys sw 5,5
C ext 0
C bypass 0
C kill on 0
C kill off 0

05
syn kill 0
rf agc delay 18
V kill 0
cross B/W 0
fm level 12
video level 6

06
digital osd 0
audio sw 0
video sw 0
AKB def 1
auto fresh 0
count down mod 0
gray mode 0
vsync sep up 0

07
killer sys 2
volume filter 0
Vif sys sw 38,9
brt abl def 1
brt abl treshold 0
brt mod stop def 0
emg abl def 1

08
afc gain and gate 0
secam B-y dc 8
secam R-y dc 8
R-y/B-y gain bal 8
R-y/B-y angle 8
B gamma seleck 3
RG gamma def 0

09
audio mute 0
fm mute 0
video mute 0
sound trap 4
fm gain 0
de emphasis tc 0
fbp blk sw 0

10
disable 0
vertikal tes 0
tint test 0
collor test 1
drive test 0
contrast test 0
osd contras test 0
AKB tes 0

11
osd H position 12
opt collor sys 1
opt sif sys 0
bass opt no
cen spk opt no

sharp 21FL94 GA-4

2010-07-16T19:49:00.000-07:00

(IXA983WJ, STR W6753, M61251CF, AN178208, STV9302A)

Note:
Q751 : REG 5v
Q752 : REG 8v
Q804 : ACL buffer
Q801 : REG 8,7v
Q753 : REG 5v
Q1001 : sound mute
Q201 : IF pre amp
DZ201 : REG 33v
DZ603 : REG 27v
Q754 : REG 5v
Q1073 : spot discharge circuit
Q603 : heater protector circuit

TV Akari No sound

2010-06-09T16:29:00.000-07:00

kemarin dapat servisan tv akari dengan IC croma TA 8690, keluhan dari siempunya yaitu tv tidak ada suara tapi gambar bagus.
setelah memperbaiki semua solderan dan belum membuahkan hasil dilanjutkan penggantian kristal pada FM detector 5,5mhz.........coba tv di nyalakan jrenggggggg suara bisa nongol........
tapi kok masih ada suara dengung.....dengan peggantian condesantor copel unuk input dan output blog audio suara dengung bisa dihilangkan...
salam sukses selalu.....

TV INTEL frequensi selalu bergeser

2010-03-20T15:55:00.000-07:00

Tv intel ini menggunakan ic croma TA8690, dimana keluhan si empunya tv bahwa pada saat dinyalakan untuk pertama kali gambar tampak normal tapi beberapa detik kemudian gambar jadi meleot2/tidak bisa ditonton.........

pada saat saya coba memang benar pada saat pertama tv on gambar memang tampak normal untuk beberapa detik tapi suara agak timbul tenggelam
aksi pertama yang saya lakukan cek semua solderan..... apabila sudah dirasa ok, coba tv di onkan kemabli dan hasilnya......masih sama seperti semula.
aksi kedua mempraktekan pengalaman teman2 yang sdh di tulis di blog.......hasilnya juga nihil......waktu auto search channel tidak mau pindah.
karena capek coba sana sini belum ada hasil istirahat dulu ahhh..........
setelah badan terasa fresh pelacakan kerusakan di lanjutkan kembali....coba saya ukur tegangan vt dan tegangan AFT out.
pada channel kosong teg VT menunjukan 0,7v dan AFT OUT 3,2v.......iseng2 saya justment trafo AFT dan teg aft bisa turun ke 1,5v kemudian saya justment trafo IF dan teg bisa 0,7v,coba auto search dan.............hasilnya semua channel bisa tertangkap.
saya sempat kurang yakin saya coba ulangi langkah di atas dan hasilnya memang mak....nyosssssss.......
untuk suara yang timbul tenggelam bisa mengikuti trik kang zaenal.......dengan mengganti kristal 5,5 dengan modifikasi trfo if fm.
salam dan sukses untuk semua...............

MANUAL LCD PROJECTION TV

2010-02-05T15:43:00.000-08:00

tv_lcd_projection(daewoo).

PIN Flyback

2010-01-13T02:04:00.000-08:00

154-064P Goldstar
154-177B
FCK-14B047
C _ 180v _ B+ _ Gnd _ 16v _ 24v _ 40v _ Abl _ Heater _ Afc

F 0101KM-SA
F 0141 PE-M
C _ B+ _ Gnd _ 24v _ 16v _ Afc _ 180v _ Gnd _ Heater _ Abl

K 148 TC
C - 180v _ B+ - Gnd _ Afc _ 16v _ Abl _ Heater _ Nc _ Nc

FCG 2045 BL
Afc - 16,5v _ Heater _ Boost-up _ B+83v _ Gnd _ Nc _ C _ Abl _ 175v _ 24v

FSA 16012M
DCF 2077A
DCF 1577
FSA 16012M
C - B+ - Afc _ Boost-up _ 16,5 _ Abl _ 25v _ Gnd _ 185v _Heater

JF 0501-1206 sansui
C _ B+ _ 180v _ 16v _ 25v _ Heater _ Gnd _ Abl _ Afc _ Nc

JF0601-19577 (polytron)
C_B+_gnd_200v_nc_Ht_nc_abl_+12_-12

FCK 14A006 digitec, polytron
FCM 2015HE
FCM 14A032
C _ B+ _ Abl _ 24v _ Heater _ 16v _ 180v _ Gnd _ Nc _ Abl

FCM-20B061N (polytron)
c_B+_gnd_185_nc_Ht_Nc_abl_+12_-12

FUY-20C009 (akari)
C_180_B+_gnd_nc_24_nc_abl_Ht_afc

BSC 65A changhong
C _ B+ _ 190v _ Gnd _ Nc _ Nc _ 14,5v _ Abl _ Heater _ Afc

154 - 132A intel
154 - 132C
C _ 40v _ 16,5 _ Heater _ Gnd _ B+ _ 180v _ Gnd _ Abl _40v

FCK 1411 L 01
FCM 14A025
C _ Boost-up _ Abl _ B+ _ Gnd _ 180v _ 24V _ Heater _ Afc _ 16,5v

154 189H
154 277C
FCM 20B027
C _ B+ _ 180v _ 16v _ 24v _ Heater _ Gnd _ Abl _ Afc _ Nc

MC - FBC-015
LCE CF0854
C _ B+ _ Gnd _ Afc _ 185 _ Heater _ 25 _ 15 _ Gnd _ Abl

FSV - 20A001 samsung
FCK - 14A033
FSV - 14A001
C _ B+125v _ Abl _ Nc _ Gnd _ 185 _ 46 _ Heater _ Nc _ 16,5

FTK-14A004P (samsung)
C_B+125v_ABL_ Nc_ Gnd_ 180v_24v_Ht_afc_16,5

8-598-858--00 sony KV-PG21P70
8-598-811
C _ B+135v _ 200v _ Heater _ Gnd _ -16,5(vertkl) _ Gnd(vertkl) _ +16,5(vertkl) _ Nc _ Abl

8-598-960-00 sony KV-G21P1
C_b+115V_200V_ht_ gnd_-13v_gnd_+15v_nc_abl

TFB 4125 DY (thosiba)
TFB 4125 HY
C _ B+ _ 180 _ Gnd _ Nc _ 26v _ 12v _ Abl _ Heater _ Afc

BSC 22-01-06
BSC 25-48
BSC 25-4803
BSC 24-01N362
C _ B+ _ Nc _ afc _ gnd _ Heater _abl _ nc

BSC 24-01N4014K tv china
BSC 25-T1010A
BSC 25-09N21A
BSC 25-05N2110A
BSC 25-09N20E
Tep _ C _ Tep _ B+ _ Tep _ Tep _ gnd _ Heater _ abl _ 180v

BSC25-2678S konka K2169TC
C_200v_B+_ gnd_afc_16v_abl_ht_nc_nc

JY0301-0206 tv china 29
C_B+_nc_afc_gnd_HT_abl_tep_tep_tep

DCF 2217J
C _ B+ _ afc _ boost-up _ 16,5 _ 24 _ abl _ gnd _ 200v _ heater

F0101 KM-SA sharp 14R20
F0102 KM-SA sharp 20R20B, 20R200, 51R200
C_B+_GND_24V_16V_AFC_180V_GND_HT_ABL

FA122WJ-B
C_B+(130V)_GND_24V_NC_AFC_180V_GND_HT_ABL

F094
FA061 WJ-SA sharp 51X200
C_B+(130V)_GND_24V_12V_AFC_185V_GND_HT_ABL

F0122 PE-M sharp 20Q250
C_B+_24V_16V_NC_AFC_GND_HT_180V_ABL

F0147
C_B+_GND_24V_16V_AFC_180V_GND_HT_ABL

F0194 PEN1-SA sharp 20R200MKII, 51U200, 20W200
F2037 PE-B sharp 20AG2-S
C_B+_GND_40V_16V_AFC_180V_GND_HT_ABL

FA011 WJ-B sharp
C_B+_GND_24V_16V_AFC_180V_NC_HT_ABL

FA060 WJ-SA sharp 14S20MKII
C_B+_CND_NC_12V_AFC(-12V)_180V_GND_HT_ABL

FA113 WJ-B sharp 51DXF250E
C_B+_GND_24V_NC_AFC_180V_GND_HT_ABL

F0193 PEN1-SA sharp 14U15
C_B+(115)_GND_40V_12V_AFC_180V_GND_HT_ABL

JF0501-32601= FA132 sharp Alexander 21PXF200
coll_B+_GND_24_NC_AFC_180_GND_H_ABL

BSC 25-0216F= FA135= F0147 Sharp 14V20D2
C_B+_GND_24V_16V_AFC_180V_GND_HT_ABL

TV LG 29fs4rk (chassis cw 62c)

2009-12-23T20:22:00.000-08:00

lg_29fs4rk_chassis-cw62c_[ET]

TV sharp Universe

2009-11-22T15:50:00.000-08:00

Kemarin lusa saya mendapatkan tv sharp type 21U25 dalam kondisi power mati.
setelah dilakukan penelusuran ternyata IC 701(STR F6654), R704(15 ohm),optocoupler PC123,D711(IN4148),D70(zener 10v),D716(zener 15v) dalam kondisi rusak.
setelah semua komponen di atas di ganti dan tv coba dinyalakan......lampu indikator nyala hijau sebentar terus mati(tidak stanby).
Penelusuran komponen kembali di lakukan pada output regulator,dari hasil penelusuran
ditemukan R780(1K) putus,R760(470 ohm)membesar menjadi 67K.
setelah penggantian tv coba dinyalakan lagi.......dan byakkkkk......tv dapat hidup dengan normal.
allhamdulillah akhirnya terbayarkan rasa capek,ngantuk selama 2hari.
salam sukses untuk teman2 semua................

Tv sharp model 14V20D2

2009-10-22T03:57:00.000-07:00

Tadi siang saya buka tv sharp model 14V20D2 dengan keluhan tv standby,setelah buka casing dan lepas tr horizontal saya coba ukur output regulator.
Dari hasil pengukuran tercatat normal yaitu 130v, 14v dan 12v. kemudian lakukan solder ulang dan dilanjutkan pemasangan Tr horizontal.
coba tv dinyalakan............masih seperti semula.
saya coba pegang Tr hor kok panas banget padahal Tr kondisi baik, maka kesimpulan saya flyback short. tv ini menggunakan flyback BSC 25-0216 yang agak sulit di cari,kemudian saya memutuskan untuk mengganti flyback yang identic yaitu F0147 (sebenarnya ada beberapa misal F0101,F0102,FA122WJ-b dll).
setelah penggantian flyback tv coba dinyalakan crackkk..........layar buka cuma u/vertikal kurang tinggi dan hor kurang lebar. masuk mode sevice coba set hasil kurang max. kemudian saya coba naikan C mylar dari 502pf ke 802pf, hidupka tv ......alhamdulillah layar sudah bisa tampil penuh.
o..ya tv ini menggunakan IC tunggal untuk Prog dan Croma (model SMD/surface mount device).

MANUAL LG LCD TV

2009-10-07T06:36:00.001-07:00

LG TSL108Q_RZRT-20LA90

Tv TCL type 14276 S

2009-09-24T20:21:00.001-07:00

Kemarin saya buka tv tcl, keluhan dari siempunya yaitu gambar normal tapi suara posisi max(Nyaring sekali),Remote , keypad pada panel tv( volume, menu, AV ) tidak berfungsi. Satu2nya yang berfungsi cuma tombol program pada tv. Langkah pertama, biasa cek solderan, cek tombol keypad,ukur R pada jalur keypad setelah ok coba tv dinyalakan,lha.... kok masih sama saja. Langkah kedua coba ganti cristal 8 Mhz belum juga ada hasil. Kemudian langkah ketiga (Langkah ngawur), tv ini menggunakan IC Tunggal 8823( prog+croma) coba saya buka kemudian pasang lagi. Coba tv di hidupkan dan...,alhamdulillah remote + tombol panel semua berfungsi normal. Kenapa demikian saya juga tidak tahu, bagi yang mengetahui tolong di jelaskan...

Beberapa kerusakan DVD

2009-08-21T23:15:00.000-07:00

1. Sharp DVD model 740/H (tidak ada suara)
- ganti c 58( 470mf/25v).

2. Toshiba DVD u/beberapa merk toshiba (suara pelan/tidak ada suara)
- lepas c 928.

3. Toshiba DVD model SD 210e/SD 1700( kehilangan suara dan display pada front panel)
- ganti c927/c928(100mf/16v) dengan 100mf/25v

4. LG DVD model DVD5083 (mati)
- ganti IC 101

5. Sanyo DVD model DVD7201(terkunci/gambar kunci di layar)
- Tekan tombol open + tombol FF kira2 10 detik.

6. Panasonic DVD model SA HT 70( disk tdk putar)
- ganti motor spindle.

2009-08-13T21:16:00.000-07:00

TUTORIAL MONITOR

Berikut adalah tutorial tentang Bagian-bagian dari Monitor,fungsi-fungsinya & gangguan-2nya,semoga tutorial ini berguna bagi rekan-rekan yang hobi,maupun yang bekerja dibidang elektronika,terutama bagi pemula yang belum mengenal tentang Monitor.kami selaku penulis mohon maaf apabila dalam tutorial ini ada kesalahan dan kekurangan yg tidak kami sengaja,karena manusia itu tidak luput dari salah dan kekurangan.

=======================================

BAGIAN REGULATOR
BAGIAN OSILATOR VERTICAL & HORISONTAL
BAGIAN PROGRAM
BAGIAN DRIVER HORISONTAL
TRANSISTOR HORISONTAL OUTPUT
FLYBACK
BAGIAN VERTICAL OUTPUT
BAGIAN RGB

****************************************************************************************

A.Tabung/CRT(catoda ray tube):Tabung berfungsi untuk menampilkan informasi-informasi gambar yang kita lihat,disekeliling tabung terdapat gulungan tembaga yg dibungkus dengan solasi yg dinamakan degaussing coil,degaussing berguna untuk menyetabilkan medan magnit didalam tabung, ciri-ciri dari kerusakan tabung Ialah: 1.gambar tak tampak 2.gambar tampak tapi gelap. 3.warna tidak lengkapatau pincang. 4.gambar tidak focus atau buyar 5.layar nyala merah/hijau/biruterang tapi bergaris. 6.gambar tampak tapi hanya salah satu warna saja dll.

B1.Defleksi yoke : defleksi yoke terbuat dari tembaga yang dililit dibatang ferit yg melingkar, defleksi yoke terdiri dari dua bagian,yaitu lilitan horisontal dan vertikal, untuk lilitan horisontal terletak dibagian dalam dan vertilal dibagian luar, defleki berfungsi untuk menarik elektron-elektron didalam tabung kearah horisontal dan verikal.ciri-ciri dari kerusakan defleksi Ialah: 1. defleksi horisontal,untuk kerusakan defleksi horisontal biasanya kebakar,atau jamuran dan dilayar gambar tampak tapi ditengah dan kanan kiri melengkung.2.Defleksi vetical,ciri-ciri kerusakan defleksi vertical ialah gambar nampak ditengah dan bergaris-garis atas bawah hitam,tetapi untuk defleksi vertical biasanya jarang sekali terjadi kerusakan.

B2.pincusent adjustmen/cincin pengatur warna:cincin ini berperan penting didalam monitor,cincin ini berfungsi untuk mengatur bayangan warna,supaya gambar maupun tulisan tidak ada bayangan warna,sehingga akan tampak warna aslinya.

C.Regulator/power suply :Regulator berfungsi untuk menyuplay tegangan keseluruh rangkaian pcb/board, juga kerangkaian RGB dan tabung,biasanya tegangan output/sekunder pada tiap2 regulator monitor belum tentu sama,tapi pada intinya ada 3 yaitu 1. +Dc 6,5 volt untuk menyuplay tegangan ke vilamen CRT, 2. +Dc 12>15 volt untuk menyuplay tegangan ke IC oscilator horisontal dan vertical dan juga ke IC program,3+Dc 50> 75 volt untuk menyuplay tegangan ke horisontal output melalui flyback.Ciri-ciri kerusakan dari regulator ialah:1. Monitor nggak bisa nyala, 2.Monitor kalau dinyalakan terjadi konsleting pada jalur listrik,3.Monitor nyala tetapi gambar ngleod/bergoyang dll.

D.flyback :flyback berfungsi untuk membangkitkan tegangan tinggi yang semula antara 75.s/d 130. volt menjadi 25 kilo volt,flyback berguna untuk menbangkitkan cahaya didalam tabung,dibadan flyback terdapat 2 trimpot pengaturan yaitu,pengaturan scren dan focus,scren berguna untuk mengatur gelap terangnya gambar,dan focus berguna untuk mengatur kefokusan gambar atau tulisan.Ciri-ciri dari kerusakan flyback ialah:1.Gambar buyar/tidak focus 2.gambar ada tapi terlalu terang,ada garis buku 3.gambar gelap 4.led control nyala tapi monitor nggak bisa hidup 5.monitor nyala tapi bunyi pletek-pletek 6.monitor nyala tapi gambar kedip kedip dll.

E.Rangkaian RGB:rangkaian ini berfungsi untuk mengolah warna yg datang dari VGA card dan dikirim ketabung gambar/CRT. Ciri-ciri dari kerusakan RGB ialah:1.gambar merah kekuning kuningan 2.gambar biru kemerah merahan 3.gambar biru keputih putihan 4.gambar tampak tapi hanya hijau,merah atau biru dll.

F.Dibawah tabung ini terdapat 1. Rangkaian program 2.Rangkaian oscilator vertical,horisontal 3.Rangkaian vertical output 4.horisontal driver dan output,untuk gambar ini tidak saya perlihatkan secara detail karena untuk tiap-tiap jenis monitor letaknya belum tentu sama,dan sebagai contoh lihat gambar diatas, Board samsung 591s.tetapi akan saya terangkan cici-cirinya .

Rangkaian program: terdiri dari IC (intergrated circuit) dan tambahan komponen disekelilingnya untuk mengetahui IC program ciri-cirinnya ialah,sebagian kaki- kakinya terhubung ke swit Digital yang ada dipanel depan monitor,IC program berfungsi untuk mengendalikan semua pengaturan yang ada di monitor, seperti V size,V center,H size,H center,colour dll.ciri-ciri kerusakan dari IC program ialah,led indikator nyala tapi monitor nggak mau hidup,monitor nyala tapi semua pengaturan nggak berfungsi,monitor nyala kemudian beberapa menit mati dll.
Rangkaian oscilator Vertical & Horisontal :Untuk rangkaian oscilator vertikal dan horisontal biasanya jadi satu dalam IC (intergrated circuit) ada juga yang jadi satu dengan rangkaian program.ciri-ciri dari rangkaian oscilator vertical dan horisontal ialah,sebagian kaki-kakinya terhubung ke ic output vertical dan basis transistor driver horisontal....

**from:sadarelektronic**************************************************************************************

SOKET VGA

Pin CRT

2009-08-13T21:01:00.000-07:00

9 pin

1. GND (NC)
2. GND
3. KG (green)
4. G2 (screen)
5. KR (red)
6. heater
7. heater
8. KB (blue)
9. GND (NC)

7 pin

1. KB (blue)
2. heater
3. heater
4. GND
5. KR (red)
6. G2 (screen)
7. KG (green)

11 pin

1. KB
2. gnd
3. gnd
4. H1
5. H2
6. KR
7. gnd
8. G2
9. gnd
10. KG
11. gnd

TV merk china layar gelap

2009-07-07T16:41:00.000-07:00

Merk dari tv ini multimax platinum series, gejala awal yaitu layar gelap /tidak ada bayangan sama sekali.
langkah awal saya lakukan pengukuran semua tegangan B+110v, 28vv, 18v, 11v, teg video 180v, filamen, g2, semua dalam keadaan normal.
klo semua dalam keadaan baik/normal kenapa layar masih gelap................................................,
langkah kedua saya coba ganti C pada G2, biasanya C ini juga bisa menyebabkan layar gelap.
sudah di ganti C nya EEEEE........................layarnya kok masih gelap, kira2 apanya...............,
langkah ke tiga cek kesehatah tabung, dengan mengunakan external voltage untuk filamen saya coba ukur kaki2 katodanya dengan avometer pada posisi 1K. lha......dari sini ketahuan ternyata tabungnya yang kurang sehat karena simpangan jarum avometer sangat kecil sekali. pada posisi pengukuran seperti diatas seharusnya simpangannya 1/2 - 3/4 klo tabung kondisi normal.
setelah tabung di restore kemudian di coba ALHAMDULILLAH tv bisa tampil dengan gambar yang normal.
Demikian sedikit pengalaman semoga bermanfaat bagi yang memerlukan.

Tv sharp QBEAT 20R200

2009-04-27T06:01:00.000-07:00

Satu minggu yang lalu saya mendapatkan TV sharp Qbeat type 20R200 dengan keluhan setelah power on led indikantor nyala hijau sebentar kemudian berubah merah dan berkedip2( 2x).
saya coba cek output regulator B+115v, 16v,12v, Tr hor semuanya dalam keadaan normal.
Perkiraan saya kerusakan pada IC memory(EEPROM), setelah coba saya ganti hasil tetap seperti semula tetap proteck.
karena pikiran sudah buntu saya istirahat dulu sambil mengamati papan PCB, disitu saya menemukan switch NOR dan SEV.
saya coba arahkan switch ke SEV dan mengukur teg B+115 ternyata drop tinggal 60v dengan Tr hor dan R kapur panas sekali.
atas saran seorang teman saya di anjurkan mengganti flyback, setelah flyback saya ganti dan tv saya hidupkan mak byak...... layar mau buka.
tapi timbul masalah baru lagi jika switch dipindah ke normal tv proteck lagi, jadi layar cuma mau buka pada posisi sev itupun OSD tidak tampil dan mode servis tidak bisa di set.
tanpa sengaja kemarin saya kepingin nglepas ic program untuk coba saya ganti yg baru,
sebelum saya beli saya cek harga dulu ternyata harganya lumayan mahal.
karena ndak menemukan jalan keluar saya pasang lagi IC progam yg tadi saya lepas.
untung2an tv saya nyalakan lagi dan .............................tv bisa hidup dan tidak proteck lagi.
ini sekelumit pengalaman semoga bermanfaat.
Thank's issy romadona blogspot haved support me.

Tv Sharp trouble

2009-03-28T16:02:00.000-07:00

Tiga hari yang lalu saya mendapatkan tv sharp dengan gambar di bagian tengah berlipat,gambar sisi kiri maupun kanan agak berkurang.
Pertama saya cek solderan kalo2 ada yang kurang bagus, kemudian tv saya hidupkan e.....hasil masih sama (gambar masih terlipat bagian tengah).
saya pernah baca sebuah artikel jika tv bagian sisi kanan maupun sisi kiri menyempit problem pada B+ 110V.
kemudian saya coba lepas elco 100mf/160v, teryata kaki2nya sudah korosi.
setelah saya ganti elco tersebut dan tv coba saya hidupkan lha.............gambar langsung penuh dan tidak terlipat lagi.
semoga berguna bagi para pemula.

Tv goldstar sering standby

2009-03-18T16:09:00.000-07:00

Problem tv goldstar yang sering standby sendiri ini terjadi sebulan yang lalu.
tv goldstar 21" cuma typenya saya lupa, langkah pertama buka casing kemudian ukur semua tegangan regulator dan memperbaiki semua solderan.
Dari hasil semua pengukuran tegangan regulator tidak menunjukan adanya kelainan, tapi kenapa setelah di onkan sekitar 2jam tv akan mati sendiri dan akan hidup kembali apabila kita tekan tombol power pada remote.
saya sempat melakukan beberapa exsperimen termasuk mencoba dengan external regulator, karena saya pikir sumber trouble pasti dari regulator.
Tapi dari semua exsperimen itu hasil tetap nihil, akhirnya saya share dengan teman2 di yahoo answer.
Dari situ saya mendapat jawaban dari seorang teman yang saya lupa namanya, beliau menyarankan untuk mengganti Condesantor untuk catu driver transistor horizontal yang nilainya 2,2mf/160v.
kondensator tersebut klo dilihat dari atas memang tanpa cacat/tidak gembung, tapi setelah saya lepas, ternyata bagian bawahnya yang gembung.
setelah saya ganti C tersebut dan tv saya nyalakan alhamdulillah tv bisa hidup tanpa stanby2 lagi.
ini sekelumit pengalaman semoga berguna bagi para pemula, intinya jangan malu untuk bertanya.

Tv Lg protek

2009-03-16T17:04:00.000-07:00

Kemarin ada orang antar tv merk LG ke ruamah saya, dengan keluhan layarnya gelap.
setelah saya buka saya coba on kan, saat pertama start memang terasa hentakan HV nya, tapi heater tidak nyala juga G2 nol.

kemudian saya coba lepas kabel yoke, soket crt, dan kabel HV dari crt.
saya coba semburan HV pada sebuah besi, eee... ternyata teg HV cuma keluar sebentar langsung protek.
kesimpulannya tv terprotek, baru saya coba cari apa penyebabnya.
dari teori bang zic, saya coba pasang external heater dari sebuah trafo 1 A dengan voltage 6v.
untuk mengetahui sumber protek.
Tv coba saya hidupkan la dala.... tv malah hidup dan tidak terprotek lagi, berarti sumber protek pada heater.
kemudian saya buat lilitan pada Fbt untuk mencatu heater, lagi-lagi saya nyontek teori bang zic.

semoga bermanfaat.

Tv Norita layar gelap

2009-03-16T16:34:00.000-07:00

Beberapa hari yang lalu dapat servisan tv cina merek NORITA dengan keluhan layar gelap tapi suara normal.

saya coba buka casingnya kemudian tv saya onkan, dari indkantor yang ada heater nyala(6v), G2 75v, tegangan Katoda R G B (120v-130).
dari indikator tegangan seperti diatas layar seharusnya sudah membuka tapi kenapa kok masih gelap padahal screen sudah di putar max.

beberapa bulan yang lalu saya pernah membaca artikel pada blog www.elektronikrepairguide.com tentang monitor yang tampilannya gelap.
dari situ diterangkan bahwa kemungkinan kerusakan pada kondensator tegangan tinggi pada G2 yang di paralel dengan ground, nilai kondensator itu 102/2kv yang letaknya di blog R G B di belakang CRT.
saya coba terapkan teori artikel di atas dengan mengganti kondensator teg tingginya.
Pada tv norita nilai kondensatornya 202/2kv, alhamdulillah begitu tv di onkan layar langsung membuka.
semoga bermanfaat.

2009-03-15T18:10:00.000-07:00

Macam - macam gejala kerusakan umum dan penyebab kerusakannya (berdasarkan dokumentasi service monitor) :

No.	Keluhan	Gejala kerusakan	Penyebab kerusakan, bagian
1.	Mati	Lampu power off	Power Supply
		Meledak, berasap	Power Supply, Horizontal, Vertical

2.	Blank	Lampu power kedap-kedip	Power Supply, Horizontal, FBT, Digital Control
		Tidak ada tampilan	Video, Digital Control, Horizontal
		Kadang ada gambar	Video kendor, kalau dipukul nyala bagus

3.	Gambar bermasalah	Warna berubah	Video, Kabel Monitor
		Warna merah tidak ada	Video, Kabel Monitor
		Warna hijau semua	Video, Kabel Monitor
		Warna biru, kuning	Video, Kabel Monitor
		Berbayang	Video
		Buram, tidak fokus	Video, FBT
		Terlalu / makin terang	Video, FBT
		Ada titik di tengah	FBT, CRT
		Gelap, lama baru terang	Video, CRT
		Mengecil, Melebar	Horizontal, Vertical
		Segaris vertical	Horizontal
		Satu garis horizontal	Vertical
		Rolling naik turun	Sinkronisasi, Vertical
		Warna-warni, bercak biru	Degaussing, pengaruh medan magnet
		Panas, lalu mati	Power Supply, FBT, Horizontal
		Gambar cuma setengah	Vertical
		kalau lama, panas, bunyi	FBT
		Resolusi tinggi tdk bisa	Sinkronisasi, standar monitor ?

4.	Panel bermasalah	Tombol tdk berfungsi	Switch panel, Panel Control
		OSD Menu tdk tampil	Switch panel, Panel Control
		Gambar terlalu ke kiri	Switch panel, Panel Control
		Tidak bisa setel menu	Switch panel, Panel Control

source: pusatservice.com

2009-03-08T08:31:00.001-07:00

How To Repair Computer Monitor Display Problems Caused By A Defective Screen Grid Voltage (G2) Capacitor

Computer Monitor display problems such as no display with high voltage symptom can be caused by many reasons. A defective picture tube, a faulty video preamplifier IC, a missing heater voltage, torn signal cable, negative G1 voltage became too high (-120 volt and above), CRT board problems, a missing or low G2 voltage and etc could cause no display but with the present of high voltage.

In this article I’m going to show you how to tackle a missing or low G2 voltage problem. First, you must confirm if there is high voltage present at the monitor. You can use a high voltage probe to measure the anode voltage (24 KV) or you can try to listen to the high voltage sound produced (if you are experienced enough) once the monitor is switch on If the high voltage is present then your focus should be in the screen grid voltage (G2) circuit. If there is no high voltage, then I will explain it in another article.

How to confirm if G2 voltage present at the pin of the CRT board? By placing your positive probe (red probe) to the G2 point and negative probe to cold ground with power on, your meter should registered some reading.

For your information, certain types of computer monitors, if you place your multimeter to the G2 point it would caused the monitor to shut down due to the caused of impedance loading of your meter. Assuming you measured a low G2 voltage say 20 volts dc (a good G2 voltage is somewhere between 250 – 300 + DC volt), the next step you should do is to isolate the problem to see whether is the G2 circuit that dragged down the voltage or the flyback transformer focus/screen voltage divider that had gone bad.

Switch off the monitor and desolder the G2 wire from the CRT board. Place your probe accordingly (red probe to G2 wire and black probe to cold ground) Now, switch on the monitor and begin to see the meter readout. If the reading you get is still about 20 volts or higher a little bit then suspect a defective flyback. You can also try to adjust the screen voltage control of the flyback.

If it already turned to maximum then the flyback need to be replaced. You can also use a cheaper way to solve it. Use a monitor blur buster to add in and defeat the original focus/screen cable and use the cable from the monitor blur buster to act as focus and G2. Thus, with this method the newly tapped G2 voltage could be solder it back to its original location and you will get a display when the monitor is switched on!

Now, what if the readout from your meter shown 250 to 300+ volts dc when the G2 wire voltage checked out of circuit? This is a very clear indication that there could be components that pulling down the G2 voltage to 20 vdc. From experienced, the resin coated type high voltage ceramic disc capacitor (usually in the 1-3 KV range) had caused quite a number of monitors became no display due to the capacitor pulling down the G2 voltage.

If you measure the high voltage capacitor with a digital capacitance meter or tester, chances are very high it reads okay (within the capacitance range). The truth is, you cannot rely on digital capacitance meter to test the capacitance value only, in fact this high voltage capacitor have a high tendency to breakdown when under full load or operating voltage.

The capacitor can only be accurately test by a special meter like the Sencore LC103 capacitor analyzer.

The cost of this meter is very high, so what I did I bought a Kyoritsu insulation tester for checking the high voltage capacitor purposes. Just clip on the capacitor leads under test and press start, a good capacitor will show some charge and discharge reading but the spoilt one will remained high and would not discharge.

Replacing only the bad high voltage capacitor made the G2 voltage rise back to normal and solve the computer monitor display problem. Hope you enjoy this article and please feel free to drop by website to learn electronic repair tips and secrets everyday.

A Kyoritsu Insulation Tester

source: Electronicrepairguide.com

2009-03-08T08:22:00.001-07:00

What Is Flyback Transformer?

Definition of flyback transformer and how it can generate high voltage with the help of a driver pulse.

A Flyback Transformer

The flyback transformer is an integrated transformer which mean it has built in rectifiers and divider networks and several low voltage windings. The purpose of a flyback transformer in a monitor or television is to generate high voltage about 24 kilovolts dc to picture tube or crt.

Older type of flyback transformer design have its high voltage diode built in outside and is called tripler. If any of the diodes spoilt you just have to replace the triple, But today, the flyback transformer came in one piece and all the high voltage diodes are molded inside the casing. If one of the diodes shorted inside you have to replace the whole unit.

The external features of a flyback transformer consist of a voltage divider where we called it as focus and screen. Inside the divider is actually a resistor networks control where the top control is always the focus adjustment and the bottom one is screen or G2. In order for a flyback transformer to function, a B+ supply voltage must enter to the primary winding and at the same time a horizontal output transistor or HOT must switch.

The HOT switching was done by horizontal driver circuit and with the help of a horizontal driver
transformer. If missing either one of the B+ voltage or signal to the HOT, the flyback transformer will not work. Of course there are many more factors that contribute to the malfunction of a flyback which i will explain in more details to you in this website.

source:Electronicrepairguide.com

2009-03-08T08:21:00.001-07:00

How To Locate Flyback Transformer ABL Pin Using Analog Multimeter

The flyback transformer abl pin play a very important part in a monitor and tv circuit. If there is a problem in monitor about contrast not clear or no contrast, the first thing i will do is to test on the flyback transformerABL pinout (automatic blanking limiter) circuit line. Sometimes a weak picture tube you can be mistaken to be contrast problem. If the cathode ray tube is good after checking it with a crt tester, i will head straight to look at the contrast circuit in crt board and flyback transformer. The question is how do we know where is the contrast circuit located especially there are so many models of monitor in the market? Is easy, if you have the information or specification for the video pre-amplifier ic which you can download free from the internet , definitely you can locate the contrast pin.

LM1203N video pre-amp ic is very common used in computer monitor circuit and the contrast pin is located at pin 12 of the ic and marked as contrast. You have the choice to replace the ic or trace from this circuit to find the cause of the contrast problem. From my experienced, usually capacitors shorted and resistor turned into high values were the caused of the contrast problem. Sometimes the video pre-amplifier ic can also be the caused of the problem.

To confirm whether is the circuit or ic problem, you have to remove the contrast pin and switch on the monitor. If the monitor have a good picture (contrast ok) then suspect the abl line circuit. If it remain the same (dim contrast or weak picture) replace the color video pre-amp ic will usually solve the problem. The contrast signal are taken from one of the pin (leg) of a flyback transformer which we called it as abl pin. Many engineers and technicians have the difficulty to trace the abl pin because most of the flyback transformer have 10 pins and you do not know which is the abl pin. Some pins are B+, GROUND, AFC, ABL, X-RAY PROTECT, VCC, to HOT, HEATER, horizontal centering and etc. But there is one and simple way that i' m going to show you how to locate the abl pin effectively. Combine two analogue meters set to the range of time x10kohm and connect it in series (+ probe to - probe) and measure the flyback transformer from anode (the suction cap) to all of the pins under the flyback transformer.

You have to desolder all the pin or just remove the flyback transformer from the monitor board in order to get a precise reading. If either one of the pin shows a diode reading that is the abl pin. I guessed now you should know about testing diode, if you don't know you can always refer back to my website to find the diode testing page. The reason we use two analogue meters is because the flyback transformer internally have couple of high voltage diodes connected in series.

If you have a schematic diagram or any monitor or television electronic servicing magazine, book or circuit, you will see that the internal flyback diode are connected in series. By connecting two analogue multimeters the output from the probe is about 24 VOLTS which is enough power to measure the flyback internal diodes. After you have determined the abl pin, you are now can proceed to trace the line and find the faulty components that cause the contrast problem. Television or tv flyback transformer generally have the same designed compare to monitor flyback except that the monitor flyback have an extra high voltage capacitor which we called it the internal capacitor or just internal caps.

Whether it is a montblanc flyback transformer, rca, mitsubishi or sony flyback transformer the checking usually is the same. Please do not use an analog multimeter that have the time 100kohm range because the internal battery (only 3 volts) is not enough power to check the high voltage diodes in the flyback transformer. With more practice i hope that you can find flyback transformer abl pin easily and be able to tackle the contrast problem.

source:Electronicrepairguide.com

2009-03-08T08:19:00.000-07:00

Finding Monitor Flyback Transformer Substitution with the help of Schematic and Cross Reference

The Monitor flyback transformer comes with many parts number, design and winding values. Even though it have different part numbers, some can be use to replace on another monitor! Monitor flyback transformer are manufactures by many different manufacturers thus many different types of part numbers are produced. If you know the winding value of each flyback then it is easy for you find a substitution.

One example is the Samtron flyback with part number of FKD15A001 and is the same as FKG15A001. Another good example is the acer monitor-19.00026 same as 19.00038. In order to successfully find out whether a particular flyback can be substitute with another part number or even with another brand of flyback transformer is to use an inductance meter.

Usually monitor flyback transformer have few pins that are important which is the B+ pin, collector pulse pin, G1, AFC (automatic frequency control), X-RAY PROTECH, ABL (automatic blanking limiter), GROUND, and horizontal centering pin. If you want 100% sure that the replacement flyback can work for your monitor, you have to first calculate the inductance values of each winding.

Tolerances should be around 5-10 % and make sure you know which pin you are measuring. Let’s say the original flyback primary winding (B+ pin and collector pulse pin) have a inductance value of 1.5 milihenry then the substitution flyback should have a value somewhere between 1.4 to 1.6 milihenry. If the inductance value is too high or too low, it will cause the monitor display horizontal size becomes too large or too small and even can burn the Horizontal output transistor in split of seconds.

The flyback transformer pinouts winding value that you should know before substitution

Your next move is to find out the value of Ground to G1, Ground to AFC and so on. If you want to find out the ABL pin you can refer to this abl pin out article. If you have a flyback transformer schematic or circuit diagram then it would be good to help you to easily locate the right pins. If you don’t have then you have to find the pin on your own with the inductance meter.

It may take you some time to master the art of checking the inductance value of flyback but the time you have invested is well spent and who knows one day you can get the right substitution of monitor flyback transformer even without the help of a flyback transformer cross reference schematic. One last word, whether it is a Imac, Hitachi, Sony, Rca Tv, or any type of flyback, the method of finding the substitution is the same. It just need hard work.

source:Electronicrepairguide.com

2009-03-08T08:18:00.001-07:00

Understanding Flyback Transformer Pinout The Easy Way

Television and monitor flyback transformer pinout have some common designed except that the monitor flyback have internal capacitor built in. The internal capacitor value have around 2.7 nanofarad to 4.5 nanofarad to improve the picture quality especially when the monitor that can go for a higher resolution compare to Tv. If without the internal capacitor in the monitor flyback the display will curve or slightly out of shape especially at both the right and left hand side of the picture.

Mostly tv and monitor flyback transformers have about ten pins at the bottom of the flyback. Each of the pin have a purpose or function as part of a complete circuit. The common pins that you can find in monitor flyback are: B+ pin, Horizontal collector pulse, ABL (automatic blanking limiter), GROUND, G1, AFC (automatic frequency control), VCC, HEATER (to filament) and X-RAY protection.

The B+ and horizontal collector pulse pin forms one winding which we call it as flyback primary winding. It can only can be test by using a flyback meter such as the Dick Smith Lopt tester or sencore LC102 and LC103C.Normal meters can't check this kind of fault. This is the most important winding compares to others and it can easily developed a short circuit when B+ voltage line or Horizontal output transistor (HOT) shorted. Sometimes a shorted internal capacitor in the flyback transformer may cause the primary winding to burn internally and the flyback became bulge and poured out the epoxy.

Other pins are the ground, G1, and AFC winding. AFC stand for automatic frequency control and it send signal (pulse) from the flyback transformer to the horizontal oscillator ic to lock or synchronize the frequency of the monitor. If this AFC line fails the picture will shift either to the far left or far right. There is no way that you can adjust the picture to the center even with the internal adjustment in the mainboard. The purpose of G1 voltage is to pull the electron generated from the cathode (after the heater or filament heat up) and passed it to G2 which is the screen voltage.

G1 normally is a negative voltage. Most tv picture tube do not use G1 voltage. If the G1 voltage is missing or zero voltage to the picture tube the monitor display will becomes very bright with retrace lines (diagonal lines or flyback lines) across the screen and sometimes the monitor will goes into shutdown mode.
ABL stand for automatic blanking limiter- I refer it as a contrast circuit. Why? because whenever there is a contrast problem i will search for this pin and begin to trace from there. Normally a resistor increased in resistance and a shorted ceramic capacitor caused the display to become dim and you may think it might be the fault of a bad CRT.

Heater or filament pin nowadays hardly found in monitor flyback because the crt heater voltage now is derived directly from the switch mode power supply. However heater pin is still can be found in television flyback transformer. If the anode voltage is too high (more than 30 kilovolt), the x-ray protect pin will send a signal to horizontal oscillator ic in order to disable the horizontal drive waveform.

Without the horizontal drive pulse the high voltage generated by the flyback will collapsed and protect the user from excessive x-ray.

The flyback transformer pinout will also generate high pulse ac which later convert to dc through an ultra fast recovery diode. For your information, the ac pulse generated by the flyback transformer cannot be check with our normal analog or digital meter. the frequency is so high and you need a special meter to do the job. The dc voltages are then supply to various circuit such as the vertical output circuit. If you understand all the functions of each flyback transformer pinout, repairing monitor or tv will be much easier and save your precious time.

If you want to know more details about tv and monitor flyback transformer ,you may visit HRDIEMEN website and buy one of those CD that they offered. A little amount of investment can change the whole concept on how you look at a flyback transformer especially the pinout.

source:Electronicrepairguide.com

2009-03-08T08:14:00.001-07:00

Finding A Diode Replacement With The Help Of Diodes In Series And Parallel Method.

Troubleshooting tough dog (difficult to repair) problems consumed you lots of time and another problem that take you lots of time is to locate the original spare part numbers. You may take couple of minutes to find a bad components but because of no spare parts available in your component’s compartment, then you will need some extra time to find it such as to call up your electronic suppliers, finding your semiconductor data book for specification and replacement, searching the internet for the particular component data hope to get an exact substitution and some of you may visit forum to ask for an answer.

This little ‘extra time’ sometimes may take you longer than an hour. Forums usually take couples of hours to days to give you the answer.

Worst case, if there are no answer from the forum and the equipment you repair lying down the corner of the technical department waiting for you to settle it-sound familiar? Even if your electronic suppliers have the part, you will again wasting your time purposely drive to town just to get that part only. If your customer can wait then there will be no problem and what if the customers want it fast?

In today’s article I’m going to show you how you can use diodes to connect either in series or parallel to get the desire volts and ampere for replacement assuming that there is no way you can find the original part number.

When talks about diode specification, one always refer to peak reverse voltage (PRV) and ampere (A). Assuming you have a diode with the spec of 800V 2A and you want to find a replacement. You can always use diodes connect in series method to get the desire spec.

For example, two 400V 2A diodes connect in series will get you 800V 2A. You can always use this method for replacement but to make the diodes last longer you have to connect a resistor and a capacitor and place across each diode to equalize the PRV drops and guard against transient voltage.

In order to find the resistor value, as a rule of thumb, multiply the PRV rating of the diodes by 500 ohms. For example, an 800 PRV diode should be shunted by 800 X 500 equal to 400,000 ohms. As for the capacitor value, use a 0.01 microfarad ceramic disc capacitor connected across each diode.

Now, if you have a 400V 10A diode that needs replacement, you may use the diodes connect in parallel method to get the desire spec. Connect two 400V 5A in parallel and you will get 400V 10A. From experienced, if possible try to find or get the exact or equivalent part number first before using the above method. Hope this article can cut short your repair time. Have a good day!

source:Electronicrepairguide.com

2009-03-08T08:09:00.001-07:00

Understanding The High Voltage Transistor Secrets

High voltage transistors are transistors with higher specification than the normal transistor. It is usually located in the area of power transformer such as the switch mode power transformer and flyback transformer. In television and monitor that uses the flyback transformer to generate high voltage, a high voltage transistor is required to perform the job. It's location mainly beside the flyback transformer and attach to a heat sink in order to transfer heat faster. Otherwise it may blow in a very short time due to the hard work of this transistor in switching.

Typical part number of high voltage transistor that used in monitor and TV is BU2508DF, C3998, C5148, C5047, C5589, C5803 and etc. Usually their rating of volt, amp and watt is in the 1500 volt and above, 10 amps, 50 watt and more. Their sizes are much bigger than the common signal transistor.

If this high voltage transistor is shorted, you have to find the exact replacement part number in order for the equipment to last longer. Substitution part number usually won’t last long-perhaps in the few weeks or few months time and it will blow again unless you know the storage and the fall time of the transistor.

Higher voltage, ampere and wattage will not guarantee that your transistor will last long. Many times a bigger specification will blow in a split of seconds the moment you switch on the equipment. You have to go to that particular manufacturer to get the transistor datasheet and find out the spec of the transistor. Look for the fall time and storage time value. The original and the replacement value should have tolerance of not more than 20%. If not the replacement transistor will run hot and eventually blow the transistor. This will waste your precious time.

As to why sometimes even the nearest specification transistor also won't work well is because the particular equipment such as monitor-the yoke coil and the flyback transformer is designed based on the specification of the transistor. Thus, only original part number transistor that can be install in that particular equipment.

I have seen even the original number with different batch of transistor when install in the monitor causing the display to curve in (pincushion out) and the transistor runs very hot. I've checked all the circuit and components that connected to the transistor to be okay.

Even replacing the flyback transformer also won’t help. The transistor's temperature keeps rising and if I don't turn off the monitor, I believe it will eventually blow the transistor. I took out the transistor and compared with the original one and discovered that the replacement logo is a little bit different from the original transistor logo.

When I called my electronic supplier about the logo, they said that the transistor that I bought is of a newer version, thought from the same factory.

After long hour of searching for the original transistor, I managed to find one. Unbelievable, the original transistor that i replaced runs cool and the picture is perfectly fine. Guess what is the high voltage transistor part number? It was C5148!

In another case, there was one Monitor came in with no power symptom. Upon carefully check the high voltage area; I confirmed that only HOT shorted causing no power. After the replacement (the part number was BU2508DF), when the monitor is switch on, the power blink. I thought that there was some other bad components are causing the power to blink. I check again the power and high voltage section but just could not locate the fault. I took out the HOT that I had just replaced and realize that it was a little bit different from the original one. I took out another HOT that is exactly the same from my spare parts compartment and voila the monitor works perfectly okay. I begin to compare both HOT and you can clearly see the different from the picture shown below.

The lesson that I learned from this mistake is that one should always replace the HOT or high voltage transistor with an original part number (if possible) and don’t buy any components that is cheaper than the normal market price.

source:Electronicrepairguide.com

2009-03-08T06:29:00.001-07:00

Viewsonic Monitor Problems-CRT or The Degaussing Circuit?

This Viewsonic 15” Monitor came in with the complaint of color problem in the whole display. Some techs called it as rainbow display while some referred to it as color patches fault. This problem usually were related to a bad picture tube (due to a fall that caused the internal shadow mask to come out from the original location) or from a faulty degaussing circuit.

The degaussing circuit consists only of the Posistor, degaussing coil and a relay (depends on designs). Digital Monitors are using the microprocessor to trigger the relay through a NPN transistor (C945) in order to activate the degaussing circuit.

Now, whenever I see this problem I would normally first use a demagnetizer to degauss (to make the color problem (purity) to be even again). If the Monitor color patches still remain the same (no changes) then it is confirm that the Monitor CRT is at fault. There is no way to solve the bad CRT problem unless you replace it with a used or a new pc tube. If the display color can get back to normal again, then most probably the degaussing circuit has problems.

Some common problems that can happen in the degaussing circuit were dry joints (very high percentage) especially at the leads of the Posistor and a defective Posistor. You can’t test a Posistor with a normal multimeter. The only method to check it is direct replacement and retest again to see if the color problem symptom has gone away or not. If you can’t find any dry joints in the degaussing circuit, chances are very high that the Posistor may have problem. Sometimes you can remove the Posistor from the board and shake it to hear if there any loosen materials inside the Posistor. A good working Posistor should not produce a loud noise.

As for the degaussing coil, you can easily unplug the coil and test it with an ohmmeter. I came across before an open coil but the problem was very rare. You may also test the degaussing coil with the Dick Smith flyback tester. A good coil should show at least 3-4 bars and above! Assuming the problem was can’t degauss the picture tube and the Posistor and the degaussing coil you had checked to be okay, then suspect a bad relay or the circuit that trigger the relay. It could be the microprocessor is not sending the signal or the faulty NPN transistor along the circuit.

Overall, color patches problem is not difficult to repair but you must understand how the circuit works first. Many times, Monitor repairer confused about the symptom. For example- if you could see a display (character) with color patches then it is either a bad CRT or a degaussing circuit. If you could not see the display character but with color patches then suspect a defective vertical section. I had solved lots of the problem (no display character but with color patches) by changing the vertical IC and resoldering the circuit. Please take note on this complain! The Viewsonic Monitor problem that mentioned above was actually solved by replacing only the Posistor.

source:Electronicrepairguide.com

servis Mode

2009-03-07T01:25:00.001-08:00

TV WANSONIC
1. Dari Remote tekan tombol di dalam lubang (di sebalah kanan bawah)berulang-ulang (2-3x)
atau tekan tombol MENU berulang kali sampai pada posisi SEARCH/cari saluran.
tekan tombol P+/P- untuk memilih target pos. tekan angka 2483 atau 6568 atau secara berurutan, maka F0 akan tampil.
pada posisi F MODE:
Gunakan tombol P+/P- dan V+/V- untuk memilih dan merubah nilai yang di inginkan
Gunakan tombol 1-7 untuk masuk ke menu DATA SERVICE F1-F7.
untuk keluar dari service mode tekan DISP berulang-ulang.

TV MASDA
1.Tekan tombol PROD pada lubang diatas remote.
2.Tombol MUTE untuk halaman atas dan display halaman bawah, mau masuk ke menu tekan SETUP SELECT
3.Tombol vol+/vol- untuk mengganti nilai perincian.

TOSHIBA : TEKAN MUTE DI REMOTE SEKALI,KEMUDIAN TEKAN LAGI DAN TAHAN MUTE + MENU DI TV .ULANGI UNTUK PROSES BERIKUTNYA
TEKAN MENU DIREMOTE-TEKAN ANGKA 4,7,2,5
TEKAN VOL(-) DI TV -TEKAN DAN TAHAN ANGKA 9

SANYO : MENU DI REMOTE + VOLUME UP TV

TV SANYO DYNAMIC type CG14SP1Z
	1. ON kan tv
	2. Tekan dan tahan tombol MENU pada tv
	3. Tekan angka 1 pada REMOTE untuk masuk ke DATA.
	4. Untuk menyeleksi item gunakan MUTE untuk ke bawah dan Tombol TIMER untuk ke atas.

	5. Untuk merubah gunakan VOL -/VOL +
	6. Untuk SAVE gunakan tombol MENU remote.

LG FLATRON: TEKAN OK DIREMOTE + OK DI TV atau MENU REMOTE + MENU DI TV

LG ULTRA SLIM
PENCET MENU DI REMOT 2 X LALU TAHAN DAN PENCET MENU DI TV

Service Menu GoldStar MC-51B
CTV Service Mode
Simultaneously press MENU, Volume -, Program - on
the television panel.

TCL : TEKAN DISPLAY (OSD) DIREMOTE + VOLUME DOWN DI TV ,tahan 3 detik

TCL-1497AT, buka remote aslinya. Di bagian bawah ada 2 tombol, untuk setting factory dan setting logo. Tv TCL ini menggunakan IC M61266 dan IC M37160M8.

TCL Television factory Code.
Colour TV TCL Type T2111A.
Switch On television And Simultaneously press “DISPLAY” button on remote handset and Volume- button on remote control, select value press pro+/- and change value data press volume +/-.

PHILLIPS : POSISI TV STNDBY,TEKAN 0,6,2,5,9,MENU

POLYTRON : POSISI TV STNDBY, TEKAN DAN TAHAN MENU DI REMOTE HINGGA TV MENYALA MASUKAN KODE ANGKA 1013.

PANASONIC : SHORT (KONEK SESAAT) PIN 'FA-1' KE 'FA-2' ATAU TP-8 KE GROUND
PANASONIC TX SERIES :TEKAN VOL(-) DI TV + OSD

TV PANASONIC TC 14S10J
	1. Tekan tombol VOLUME -(pada tv) dan OSD (pada remote)

SHARP dengan UOC IXC-844

1. Cara pertama : Tekan tombol SERVICE pada remote. Kemudian tekan tombol MENU. Tekan tombol SERVICE lagi untuk keluar.
2. Cara kedua : Pin-5 dihubungkan ke ground. Kemudian tekan tombol MENU

SHARP : SHORT KAKI (PIN)6 DAN PIN 7 SESAAT PADA IC MCU (TDA 98XXX).UNTUK KELUAR SHORTKAN KEMBALI

SHARP EXPRESSION : HUBUNGKAN ATAU JEPIT DUA KAWAT /JUMPER J800 ( ADA DISEBELAH TUNER ) YG PCB- TELAH DISEDIAKAN LUBANG DAN DUA JUMPER SEJAJAR.

CRYSTAL : POSISI TV STNDBY,TEKAN VOLUME UP + VOLIME DOWN PADA TV BERSAMAAN DAN TAHAN HINGA TV ON

SHARP ALEXANDER : tekan VOL - dan chanel UP di sertai dengan menekan tombol power (semua pada panel tv). untuk merubah data menggunakan Remote.

.
AKARI: TEKAN SLEEP DI REMOTE + MENU TV

AKARI Service Menu
Press Menu button on television panel, Hold down menu button with sleep buton on remote control use program up or down to select type value if you wish & volume up and down to decrease or increase data value.

SAMSUNG : POSISI STANDBY TEKAN DI REMOTE : MENU - PSTD - MUTE - POWER ON
SAMSUNG PLANO :POSISI STANDBY, TEKAN DI REMOTE : DISPLAY-MENU-MUTE-POWER ON
SAMSUNG PLANO DIGITAL HD100: STANDBY-DISPLAY-MENU-MUTE-POWER
ATAU : STANDBY-MUTE-1-8-2-POWER ON
Samsung factory code.
Service Menu
Press power button on remote control going to STAND-BY mode -->press P.STD --> MENU -->
SLEEP --> POWER ON quckly.

Samsung CN5039

Posted by Elcid | 9:47 PM | Service Menu Samsung CN5039

Service Menu Samsung CN5039
Television off possition, press MUTE button, input these number , 1, 8, 2, POWER, enter the menu
service principal, to select a sub menu use Channel + / - and volume + / - to
enter service mode Samsung CN5039 .
To select items press channel up or down to adjust press volume up or down
To return to the main menu, press MENU, press to exit and save settings of Samsung tv press.
POWER.
Samsung CN565B, CT5038, CT5066.

Samsung CX7039

Posted by Elcid | 10:09 PM | Service Menu Samsung CX7039

Service Menu Samsung CX7039
Within the remote control of tv Samsung at the plate, on the side of the tracks there is a marked
diode, a 1N4148 or similar place. Turn the Television and press MENU button to
enter the Samsung tv service mode.

Service Menu Samsung
CX5944 CX6844 SCT12B CTV Service Mode
STAND-BY --> P.STD --> HELP --> SLEEP -->
POWER ON.
FACTORY MODE: set PSL=15 and PVA=63.
Controls: VOL +/-, CH +/-. Exit: STATUS

Service Menu Samsung
CB-14V10,CB-3373
CB-14V20,CB-5073
CB-20P30,CB-5079
CB-20S10,CB-5373
CB-20S20,CB-21P30
CB-21S10,CB-21S20
SCT13B
CTV Service Menu
STAND-BY --> P.STD --> HELP --> SLEEP -->
POWER ON.
Controls: VOL +/-, CH +/-. Exit: STATUS.

Service Menu Samsung
TVP3350,TVP5050,SCV11A,SCV11B
CTV/VCR Service Menu
STAND-BY --> P.STD --> MENU -->
SLEEP --> POWER ON

Service Menu Samsung
CS-721
CS-723
SCT52A CTV Service Menu
PICTURE OFF --> SLEEP --> P.STD -->
MUTE --> PICTURE ON

TV SAMSUNG CB- 1439Z ZOOM VISION
	1 Tv posisi standby
	2. Tekan P.STD
	3. Tekan HELP
	4. Tekan SLEEP
	5. Tekan POWER

.
AKIRA,FUJITEC,BOOMBA:
DAN BEBERAPA MEREK CHINA YANG LAINNYA YG MENGGUNAKAN IC PROGRAM TYPE LC8632XX SERIES : TEKAN MENU DI REMOTE DUAKALI - RECALL (Q.VIEW) - MUTE.

TV CHINA LAINNYA ( KCL,MITOCHIBA,BAZZOMBA) TEKAN VOLUME DI TV HINGGA NOL.TEKAN RECCAL DI REMOTE SEKALI, TEKAN DAN TAHAN VOLUME ( - ) DI TV BERSAMAAN DENGAN TEKAN KEMBALI RECALL DI REMOTE..ulang proses tersebut untuk masuk ke sub menu selanjutnya sampai ke posisi keluar menu servis.

AIWA : TOMBOL MENU SERVISNYA ADA DI DALAM REMOTE DI ATAS TOMBOL VOLUME (+),BONGKAR DAHULU.

JVC : TEKAN DAN TAHAN BERSAMAAN OSD+MUTE
ATAU TEKAN DAN TAHAN OSD+PICTURE

HITACHI: TEKAN DAN TAHAN TOMBOL AVDI TV, HIDUPKAN POWER SWITCH TV

SONY : STANDBY- OSD - 5 - VOL(-) - POWER ON

RCA/THOMSON : TEKAN DAN TAHAN TOMBOL VT DI TV + POWER SWITCH ON TV

AKIRA 8821 Service menu
Enter to Factory Mode settings
Press and hold key volume down on television.
Volume going to 0, press "DISPLAY" button on remote control.
Select value press program up or down and change the value pres volume up or volume down.
To exit, press and release key "DISPLAY"

AKIRA UOC 9381
Key location Steps to enter into the Factory Mode
user remote 1) Press and release key "MENU"
user remote 2) Press and release key "8"

user remote 3) Press and release key "5"
user remote 4) Press and release key "0"
user remote 5) Press and release key "0"
Success - "M" displayed

PIONER PDP-4214

Service Menu Pioner
PDP-4214
Press the {INPUT} button on the remote.
The input list will come up.
Then press the {0} {9} {1} {7} buttons on the remote.
To exit, press the {EXIT} button on the remote.
You can also press the back button when you are
in each category to get back to the main menu.
PDP-4214
Press the {INPUT} button on the remote.
The input list will come up.
Then press the {0} {9} {1} {7} buttons on the remote.
To exit, press the {EXIT} button on the remote.
You can also press the back button when you are
in each category to get back to the main menu.
PDP-4214
Press the {INPUT} button on the remote.
The input list will come up.
Then press the {0} {9} {1} {7} buttons on the remote.
To exit, press the {EXIT} button on the remote.
You can also press the back button when you are
in each category to get back to the main menu.

******Service Mode TV China dengan IC tunggal LA76931S 7N trus dibawahnya ada no 59F8 dan 7KA78.

- Cabut antena
- Volume 0
- Tekan MENU pada remote
- Tekan 6568
Muncul deh factory modenya
trus kalo mau ganti menu tinggal tekan DISPLAY
Trus kalo mau simpan
- Tekah MENU
- Tekan 6568
- Terus ulangi sampai muncul BUS OPEN
- Lalu Cabut kabel power, tersimpan deh.

TV changhong
CHANGHONG ST-29F55N processor TMPA8829CSNG,
CHANGHONG chassis CH-16 processor TDA9384PS/N2/3l CH05T1610,
CHANGHONG chassis CH-20 processor TDA9594H/N1/51 VARK90 SCAVEM-10P,
CHANGHONG chassis CN9E, CN9EA processor CH08T0934 (TMP87CM38N-2A98-1F31, CH08T0934 5H32-3K49, 5H31-3PB3 (TMP87CP38N),
CHANGHONG chassis CN-18EA processor SH08T0606 8821CSNG5BE5,
CHANGHONG chassis CN-18ED processor SH08T0605 8827CSNG5BKO,
CHANGHONG chassis EX-1A1 21C99 processor TDA9381PS/N2/2l1091 CH05T0102,
CHANGHONG chassis EX-1A4 14BM19 processor TDA9351PS/N2/3I, TDQ935XPS/N2, TDQ936XPS/N2, TDQ938X/PS/N2 (CH05T0102),
TDA9351 48K PAL / NTSC / SECAM 1 PAGE TELETEXT,
TDA9350 48K PAL / NTSC 1 PAGE TELETEXT,
TDA9361 64K PAL / NTSC / SECAM 10 PAGE TELETEXT,
TDA9360 64K PAL / NTSC 10 PAGE TELETEXT,
TDA9380 32K PAL / NTSC,
TDA9387 32K NTSC,
Set volume to 0 on the remote. Then press and hold the MUTE button on the remote and "MENU" on TV once about 2 seconds.
Exit: press POWER DIGIT or to exit.
To remove the key when you click on KEY code 8888.

CHANGHONG chassis CN-12C1 processor CH04T1221-50L9 (CH04T1222, CH04T1228) Set volume to 0 on the remote. Then press and hold the MUTE button on the remote control for TV and VIDEO both about 2 seconds.
Exit: i click to exit the S mode.

Cleaning plasma screen

2009-02-27T15:33:00.000-08:00

Summary: Although some people confuse a liquid crystal display (LCD) with a PDP (plasma display panel), both types of display are cleaned in much the same way. The most important thing to remember when cleaning a plasma TV screen is never to touch the screen with wood products—such as paper towels—or solvents that contain alcohol.

Commonly confused with, and the acronyms often mistakenly interchanged, liquid crystal displays (LCDs) and plasma display panels (PDPs) are two different forms of technology. As of this writing, LCDs have traditionally been used for smaller-sized displays, lending clearer pictures for the small screen, and PDPs used for larger viewers, such as large-screed plasma TVs. However, technology is lessening the gap between the two viewers and researchers believe that soon LCDs will be used for large displays just as PDPs are now.

As with LCDs, PDPs – or plasma TV screens – should be cleaned by a different method than what we were used to with glass-surfaced television

screens. Special anti-glare coatings are applied to plasma screens, and solvents contained within glass cleaners such as Windex and Formula 409 contain high alcohol content and can damage the plasma TV screen and anti-glare coating. Abrasive materials, such as paper towels, should never be used to clean a plasma TV screen, as wood products will scratch and etch the surface of the screen.

Instead, follow these tips to clean your plasma TV screen and keep it in pristine condition:

Unplug the television from the power source.
Using a soft, lint-free cloth, such as a microfiber cloth, gently wipe the surface of the screen.
If the screen is particularly smudged and dirty, dilute a mild detergent with water, at the rate of 1 part detergent with 100 parts water, soak a clean, lint-free cloth in the solution, wring it nearly dry, and then gently wipe the surface of the PDP, and then gently wipe it completely dry with another clean, lint-free cloth.
When the surface is completely dry, plug the unit back into the power supply.

Always avoid touching the plasma TV screen with fingers or fingernails, and certainly do not allow hard objects to come in contact with the screen. If you are dusting adjacent furniture, never allow dusting solutions or other spray solvents to contact the plasma TV screen.

Do not scratch or hit the surface of the panel with fingernails or other hard objects. Furthermore, avoid contact with volatile substances such as insect sprays, solvents, and thinner, otherwise the quality of the surface may be adversely affected.

Istilah-istilah pada monitor

2009-02-26T18:45:00.000-08:00

CRT
Cathode Ray Tube, jenis monitor yang menggunakan tabung besar sebagai display yang biasanya Anda temukan pada unit TV konvensional.
LCD
Liquid Crystal Display adalah jenis monitor terbaru yang menggunakan bahan cairan kristal dalam membentuk pemampang display di monitor.
TFT
Thin Film Transistor, suatu tipe teknologi dari monitor LCD dimana tiap pixel terhubung langsung dengan komponen transistor.
Pixel
Kependekan dari picture element, dimana merupakan elemen terkecil yang membentuk suatu gambar di dalam suatu monitor.
Colours
Menunjukkan berapa banyak warna yang dapat ditampilkan oleh sebuah monitor. Sampai sekarang kemampuan monitor untuk menghadirkan warna hingga 16,7 milyar warna.
Dithering
Dithering adalah salah satu teknik dari program komputer untuk memprediksi suatu warna tertentu berdasarkan dari pencampuran warna-warna lainnya, ketika warna yang dimaksud tidak ada.
Response Time
Menunjukkan seberapa cepat sebuah monitor bereaksi terhadap interaksi yang mengubah konten grafis di monitor. Contoh perubahan gambar di aplikasi game.
Dot Pitch
Menunjukkan ukuran jarak antara titik pusat dua titik dot pixel yang memiliki warna yang sama. Semakin dekat jarak titik (dot), maka dot pitch makin kecil, dan karena ini gambar yang dihasilkan akan semakin tajam. (PCMedia 03/2009)

LG LCD TV Reapair tips

2009-02-23T02:06:00.000-08:00

RZ15LA31 LCD DEAD DC CONNECTOR JACK
RZ15LA31 LCD ML024A
RZ15LA31 ML012A 2002/2003
RZ15LA31 ML024A DEAD T701 (SEME CD CIRCUIT)
RZ15LA32 ML024A, LCD 2002/2003 CLOVER LEAF MAINS PLUG
RZ15LA32 DEAD R712(680K) R707(330K) IC701(??? SM) CAUSE NEVER OFF
RZ15LA32 LCD INT BLANKS PIC,C51,C55(220NF) REMOVE CAN
RZ15LA32 LCD INT PIC C51,C55(220NF100V),KA3883C

Hitachi LCD Repair tips

2009-02-23T02:05:00.000-08:00

15LD2200 -No pictures -Fuse F1 and C16 or C5(150n) on inverter board

-Tidak ada gambar- cek fuse F1 dan C16 atau C5(15 on) pada inverter board

22LD4200 -Lost picture after diferent time-Dry joints on video procesor IC100 board (17MB10).

-Gambar hilang setelah beberapa saat- cek sambungan pada video prosesor pada board IC 100

22LD4200-No pictures sound ok,no pictures after diferent time CHECK 5v on 17amp07 p/s board if less 3,0 or 1,5replaced C111(25v1000mkgf)

-Tidak ada gambar suara bagus, tidak ada gambar setelah beberapa saat cek teg 5v pada 17amp07 board p/s jika kurang dar 3v ata 1.5v ganti c11(1000mkgf 25v)

22LD4200 -Lines on the picture Bad conection between PS(PL108) and VIdeo board (PL100) .

-Garis pada gambar karena sambungan yang buruk antara PS(PL108) dan Board video (PL100)

22LD4200 -Flashing green line-Green horizontal line flashing across the screen intermittently-Remove resistor R149 on the Input signal board and replace it with Jumper SMD (0 W)

22LD4200 -St-by redlight go green and back to red-Transistor(Q104 Bc548) and Resistor (100oM).

22LD4500U-No sound-Very low sound on terrestial and no sound on Digital or any AV inputs-Replace memory IC302 Type 24LC16.All customer controls are set to minimum on the new IC. Please reset language and all picture controls to normal after replacing the IC.

26LD6200-Lines on the screen,strange picture-Replaced cable from main board to the screen.

26LD6200/32LD6200-No pictures or lost after 10,20sek -replaced inverter board(P.Suplly)17PW11-2 (24Volts)

26LD6200/32LD6200-Unit does not work, standby LED not lighting-Replace Ferrite bead L500 and L501 with a jumper wire.

26LD6600/32LD6600- Looks like no Synchro impulse eeprom fault -Just go in service menu(menu,4,7,2,5) option-Factory reset.

26LD6600/32LD6600- no sound -Reinstate sound settings as follows:
Enter Service mode.Press Menu then 4,7,2,5.
Go to Audio menu.
Select Sound 2. and enter the following values:
FM PRESCALER 15
NICAM PRESCALE AVL ON 35
SCART PRESCALE AVL ON 14
SCART VOLUME AVL ON 122
GO TO STANDBY TO MEMORISE SETTINGS
Reinstate sound settings as follows.

26LD6600/32LD6600- Lines on the screen -Cable from the main board to screen super glue it.

26LD6600/32LD6600-Lines, no pictures back light present -resoldered IC224 (videoprocesor).

26LD6600/32LD6600 -

28LD5200- No colour Colour drops out after the unit has been running for two to three hours.Resolder capacitor C510 and other components in its vicinity.

32LD9700 -No sound bad conection in PFA1(HDMI board) pin 2 just take it out press and put it back.

32LD9700/42LD9700 -No sound bad soldering on cristal X800 (HDMI board).

2009-02-22T00:13:00.001-08:00

LCD Monitor Repair Tips

If you have repair the lcd monitor, then you will know the most defective parts on the lcd monitor are Electrolytic Capacitor! Why? Because the capacitor are always working on high temperature, then the material inside capacitor will easily leakage or their ESR value out. Below is some of the photo for your reference:

Tip monitor

2009-02-21T22:47:00.000-08:00

Infinity Monitor Model: 14ED (W745114477 Chassis)
No power
Checked and tested power supply section, all resistors and filter capacitor checked ok. Replaced IC802 and unit then powered up ok
(Wiland Malapit - Philippines)

Likom Monitor Model: L503RDN (13MLB0004424 Chassis)
Vertical problem, small picture, cannot adjust, sometimes rolling
Checked vertical section and found resistor R527 (10ohms) located near ICU501 had gone high resistance, replacing resistor cleared the fault
(Wiland Malapit - Philippines)

Kds Monitor Model: VS21E (Evoked 2100K Chassis)
Dead
I found following parts had failed: Q425, C4924 and R497 (10ohm, 1w), the horizontal output transistor was also short circuit, replaced with type BU2527
(Imran Khan)

Dell Monitor Model: D-1728D-LS (FCC ID A3LCMG737)
No display
I checked many parts in the Video driver area and found all was ok but IC MM1207 was found to have failed
(Imran Khan)

Sony Monitor Model: GDM2036S
Monitor dead, green led comes on then fades out, EHT sometimes starts up
Remove power supply (very easy on this monitor). I found C102, C109, C112 and C101 on sub board o/c plus C19, C8 and C9 on main pcb also o/c, all 105deg caps. This is a quality built monitor
(Bernie)

Mag Monitor Model: DX1795
Reduced width with failure to store settings
Dry joints on the display mode relay RL501
(Lacko)

Silicon Graphics Monitor Model: 340C (Panasonic PanaSync P70)
No horizontal, single white line up centre of screen
Check fuse link J114 which feeds 220v to collector of Q881
(Steve May)

Silicon Graphics Monitor Model: 340C (Panasonic PanaSync P70)
Vertical line down centre of screen, no horizontal drive
Check for horizontal drive across C516 (3V p-p both sides) if not change C516 (1uF, 100v), C516 is the blocking cap before the horizontal driver mosFet, also check for bad soldered joints
(Steve May)

Belinea Monitor Model: 10 70 35 (Panasonic PanaSync P70)
No horizontal, single white line up centre of screen
Check fuse link J114 which feeds 220v to collector of Q881
(Steve May)

Belinea Monitor Model: 10 70 35 (Panasonic PanaSync P70)
Vertical line down centre of screen, no horizontal drive
Check for horizontal drive across C516 (3V p-p both sides) if not change C516 (1uF, 100v), C516 is the blocking cap before the horizontal driver mosFet, also check for bad soldered joints
(Steve May)

Iiyama Monitor Model: Vision Master Pro 411 (A705MT Chassis)
Tripping
Change the secondary psu smoothing caps for the 12v, 28v and 80v supplies (2200uF, 25v cap blown apart), the board is also prone to dry joints
(Steve May)

Tatung Monitor Model: 47/2000 (VT-1980 Chassis)
No video
Change transistor C5521
(Roberto)

Jean Monitor Model: JD144K (Ver 6.22 Chassis)
No picture, power led blinking, ticking sound
Replaced shorted HOT (BU2508DF). Resoldered dry joints on Q408 & Q412 pins
(Mattiemutare)

Viewsonic Monitor Model: A75F
Dead
PCB board was cracked across 2 tracers cutting their path. Visible arc burn present. Occurred at position D1. I pulled PCB board out a little to see the crack and soldered the copper tracers to repair them
(Anonymous)

Dell Monitor Model: EV700B (LA80 Chassis)
White Raster with flyback lines at Power-up, after a while, the green LED starts to blink
Resistor R972 open circuit, results in loss of 103V on CRT Board
(Sharesolution)

Mag Monitor Model: DJ70E
Dead Set.
Found Resistor R318 (220K) in the power section o/c
(Anonymous)

Proview Monitor Model: PK-770 (770M)
Reduced width and height with failure to store settings, display otherwise OK, front panel control functioning as normal
Dry joints on the display mode relay (on right-hand side of main PCB, about halfway down). I have had several of these monitors with the same problem
(Ian - Brighton)

Packard Bell Monitor Model: A720
Board PWB-0172-06 (Hyundai), Green Led flashing - Power supply pumping. No picture
Replace 2SC5386 Q433 on large heatsink near FBT. Transistor has been replaced with BU2525AF
(Yves)

Packard Bell Monitor Model: 1412SL
Shuts down after 15mins with picture shrinking and dancing
Problem caused by leaky transistor Q212 (C458 npn uni)
(Guruji)

Packard Bell Monitor Model: 1412SL
Out of focus picture
The problem was the FBT part # TFB-239T
(Guruji)

Samsung Monitor Model: Syncmaster 750S (DP17LS Chassis)
C508 (2.2uF, 250V) burst
The voltage on C508 appeared around +450V (correct voltage must be +210V), Check C506 (10nF) it was found to be leaky
(Raymundo)

Lg Monitor Model: FB775C-EA
Dead
Q706 short
(Robin)

Viewsonic Monitor Model: VCDTS2183-1P (E-40 Chassis)
No power, no LED blinks
Found short circuit HOT and also found bad high volt PF in horizontal area, Replaced with BU2508DF fixed the problem
(Imran Khan)

Acer Monitor Model: 7276C
No video, no power up
Transistor IRF630 was short
(Anonymous)

Compaq Monitor Model: MV400
Blown mains fuse
Replace 4 amp fuse and degauss posistor - I have had about twenty similar repairs on this model
(Tony Hamilton)

Gateway Monitor Model: EV700
Dead
I have found that 9 out of 10 times, the LOPT is dud
(Anonymous)

Nec Monitor Model: Multisync 75
No HV, goes into shutdown
Have replaced the HOT transistor C5521 which burnt out again. I found the problem was one of the 1600v caps in the yoke circuit that had changed value, Now have to find a .0075, 1600v cap
(Imran Khan)

Ntc Alpha scan Monitor Model: KM-411 (C-411 Chassis)
Power OK but no display at all
Check for possible o/c fuse / resistor in the high voltage area
(Ian - Philippines)

Compaq Monitor Model: MV740
Dead with standby led operating normally
R925 (1Mohm, 0.5W) was o/c
(Sami)

Samtron Monitor Model: 4BNI
No display and power on indication appears a few second and then disappears. SMPS filter capacitor does not discharge at all
Suspect the flyback transformer
(K. Vatcharavelu)

Dell Monitor Model: D1626HT (SCC-L04KA Chassis)
Cold picture jumps vertically
Vertical deflection IC
(Christopher)

Hp Monitor Model: Pavilion M70
Display is dark but sometimes comes up to the right brightness, or brightness changes erratically with a relatively slow transition from bright to dark or vice versa
CRT socket has a bad solder joint at the heater pins. Resolder and have a nice day---- anyone know what causes tiny slightly curved HORz ripples at random points on the screen with this model ?
(Offset)

Compaq Monitor Model: V70
Width can not be increased
Changed all PF (capacitors) near horizontal section
(Anonymous)

Daewoo Monitor Model: 710BN
Top half of frame scan folded to bright line
Diode D105 was burnt out, this was found to have been caused by capacitor C105 (100uF, 16v) which measured dead short
(Brian)

Compaq Monitor Model: V45
Very blurry display
This was due to a faulty flyback
(Anonymous)

Brother / Aoc Monitor Model: Spectrum 7GLR
Dead, no power
There was no voltage at pin 7 of IC901, traced back to R906 ( 1M ohm 1/2W ) which was open circuit, replaced R906 and unit back to normal
(Vitus Luk)

Compaq Monitor Model: V500
No Power
Replaced D630
(Prasad)

Iiyama Monitor Model: Vision Master 17 (8617E Chassis)
Horizontal dark line across screen shadowing text or other complex display data - giving appearance of 3D grooves or just dark lines on light background - temp fix (few minutes) by banging monitor or jiggling the video cable (thats what threw me for a while)
Removed tube base board and ran over disc capacitors and other solder joints whether they looked dry or not. No re-occurence in 2 weeks of daily use. Seems to have fixed it. (Be prepared for a lot of metalwork and screw removal when opening one of these up - I still havn't figured out how to get the PSU/main board out of one !)
(John)

Iiyama Monitor Model: Vision Master 410 (400 Series Chassis)
Set wants to start up, EHT can be heard to screen but then monitor shuts down, all secondary voltage are present for a short time but decay fast
Change all the electrolytic caps in the primary power supply especially the 10uF, 100v electrolytics
(Steve May)

Malaysia Monitor Model: Titan TE555
No raster
Check C5296
(Anonymous)

Sun / Sony Monitor Model: GDM20SE20 (N2H Chassis)
Bright raster with flyback lines and reduced width, trips after 5 seconds
Replace the video drive ic on the a pcb located on the rear of the chassis around the crt neck, IC420 type CXA1907S, part no: 875207156. http://groups.yahoo.com/group/TVmonitor_schematic_tips/
(Imran Khan)

Ctx Monitor Model: PL9
Pincushion problem. Q401 may be shorted. Makes squealing noise
C334 (100uF, 250V) Failed, located at front left side of board just in back of Q311
(Gene)

Hansol Monitor Model: E14BL (MAZELLAN 401A)
Dark (but visible) display with pronounced ripple, accompanied by buzzing from the chopper transformer. Buzzing also present (but quieter) in standby
C105, the main smoothing electrolytic on the mains input side was completely open circuit. Its value is 220uF, 400V
(Ian - Brighton)

Sylvania Monitor Model: F96
No green, good blue and red
The crt board had cold solder joints
(Anonymous)

Ast Monitor Model: VISION 7L
Blows horizontal output transistor intermittently
L403 (4uH) defective, also check C446 and C451 both 10uF
(Anonymous)

Iiyama Monitor Model: VISIONMASTER 400
Powers up but goes dead when video signal applied. If powered with signal attached comes on then trips
Replace ALL the low value electrolytic capacitors in the primary side of the power supply even though they measure OK. Also check the capacitors on the secondaries especially the voltage rail that feeds the feedabck circuit for the power supply
(Arokh)

Samsung Monitor Model: Syncmaster 753S (ANNN17LS7L/EDC Chassis)
No power
I discovered IC601 (DP704C) had exploded, Equivalent for this IC is 6S0765RC
(Anonymous)

Philips Monitor Model: 2551
Dead
The BUT11AF was found to be faulty
(Ajesh)

Philips Monitor Model: 201B10
Loss of horizontal sync at change of resolutions
Change capacitor 2431 (150nF, 63V)
(Anonymous)

Panasonic Monitor Model: TX-D2151W (ACJ93312118 Chassis)
No power, no LED blink
Replaced the STRS6533 in the power supply
(Imran Khan)

Pc View Monitor Model: 1512
Dead, fuse ok, led blinking
Mosfet (IRF630A), capacitor (150uF, 400V) and burnt up resistor R720 (9.4k)
(Imer)

Philips Monitor Model: 105S
Fuse blown, not functioning
Replaced 3.15A AS fuse. Conclusion, fuses suffer from metal fatigue and fail without a serious fault being present. Constant inrush currents of 10A and degauss of similar level at switch on cause this progressive failure mode. Fuse is hard wired
(Mike - UK)

Hansol Monitor Model: 710A (Also Belinea 103055 Chassis)
Tripping, occasionally works
Dry joint on LOPT, the connection to the line OP transistor. The worst part of this job is getting the beast apart, still the thing only cost £1 from auction and now has a great 17 inch picture!
(Bob Meade, Brandon, Suffolk)

Siemens Nixdorf Monitor Model: MCM1405
Blew fuse, 2.5A A/S
D901 in bridge rectifer short. Replaced all doides in bridge with 1N4007. No other problems just a faulty diode
(Mike)

Nokia Monitor Model: 447X
Picture disappears after 10-30 minutes of use, may reappear if monitor tapped
Dry dry solder joints on the video card
(Anonymous)

Topcon Monitor Model: AM1782 (MT7A73029086 Chassis)
At power up there is a Black screen only
I checked the circuit and found that the PWM IC, KA3842B C826C (8 DIP) had failed, everything else appeared ok
(Caleb)

Viewsonic Monitor Model: E-40 Digital 14"
Int loss of display
There were dry solder joints around the power output area. http://groups.yahoo.com/group/TVmonitor_schematic_tips/
(Imran)

Aoc Monitor Model: CM336
Dead with PSU tripping. The chopper transistor and PSU transformer were getting quite hot
D920 (PSU secondary HT rectifier) was s/c. Replacement provided the fix
(Tom Crane)

Aoc Monitor Model: CM336
Intermittent loud whistling made for a very irritating fault
Varnishing the windings of horizontal linearity choke L804 cured the fault
(Tom Crane)

Aoc Monitor Model: CM336
Bad horizontal linearity with picture bowed out at the centre but only on the higher res. screen modes
C8105 (0.84uF, 250V) had gone low in value. Replacement provided the cure
(Tom Crane)

Sun / Sony Monitor Model: GDM20SE20 / GDM-20SE2T5 (N2H Chassis)
Bright raster with flyback lines and reduced width, trips after 5 seconds
Replace the video drive ic on the a pcb located on the rear of the chassis around the crt neck, IC420 type CXA1907S, part no: 875207156
(Paul)

Ibm Monitor Model: 6546-01N
Starts up OK from cold, but will not start when warm
Change C613 (47uF, 25V) Tant. and C602 (220uF, 400V)
(Simon)

Fujitsu / Siemens LCD Monitor Model: CTM5010
VGA plug had been cut off at the PC during a burglary leaving no means of pinouts ID. Here is the correct configuration
Pin | Colour | Name | VGA Plug Pin No.
1 Purple SCL 15
2 Grey SDA 12
3 Black GND 5
4 Orange SGND 10
5 Yellow VSYNC 14
6 White HSYNC 13
7 Black RGND 6
8 Pink RED 1
9 Black GGND 7
10 Grey GREEN 2
11 Black BGND 8
12 Blue BLUE 3
(Simon)

Philips Monitor Model: 3CM9609
Dead
Check R3121 (270Kohms, 1w, high voltage type) for open circuit which is located in the separate side mounted p.s.u
(Josh)

Dell Monitor Model: 1028
Picture too wide / no trapezium / no controls of said functions
Change the fast acting diode D405 near the emitter circuit of the lopt transitor. This steals some of the flyback to feed a supply to the width circuitry
(Steve may)

Iiyama Monitor Model: Vision Master (400/410 Chassis)
Picture comes on then moves quickly up off screen (vertical fault)
Change the vertical driver ic C1884CT (not the vertical output ic)
(Steve may)

HP Monitor Model: Pavilion M70
Excessive width and no e-w correction
Modulator / damper diode (DMV32) had failed, these are available from Charles Hyde
(Thunderdunc)

Mag Monitor Model: DX15T
Excessive Width / Pincushioning Problems
Check transistor Q203 (TIP127 - PNP Power Darlington Transistor). Check especially if Collector is internally short-circuited with Emitter. If so, replace it
(Francisco)

Digital Monitor Model: VRCX1-W3
No light, no HT
Replaced two fast switching diodes (R4KL)
(Henk)

Mag Monitor Model: DX15T
Dead, very low click - click sound heard from the chassis
Check Q105 if horizontal output transistor 2SC5129 and/or D104 fast soft recovery diode BD329-1200 are damaged (internal short circuit). If so, replace them
(Francisco)

Dell Monitor Model: E551
Dead, yellow led flashing.
This monitor, only a couple of years old had been got at, a good fuse silver papered, a temper crack on the cabinet rear! It turned out the Chopper FET was shorted all ways & R618 o/c these were replaced & a good picture was the result
(Bob Meade, Suffolk.)

Tce Monitor Model: M440
Não funciona e queima o Transistor de saída horizontal
Substituir o Capacitor Eletrolitico C430 (47uF, 250V)
(José Antonio Rodrigues)

Acer Monitor Model: 7254E (15 inch)
Int loss of display, Power supply stable, all other sections are working properly
Replaced one 221, 2kV capacitor in the line output transformer section
(Rejeesh v p)

HP M50 Monitor Model: D5258A
No display, ticking noise, green led is lit
Found Q402 Horizontal drive transistor (C3332) had failed, replaced with C3198, you can replace it with 2SC3198 or radio shack 276-2009 with care for the legs
(Mark Hanoun)

Viewsonic Monitor Model: P815-1M
Dead / int
Bad solder on D855 located in power supply. You have to be sure to solder both the foil side and the component side of the board on the diode
(Mike Wilson)

Compaq Monitor Model: 315U
Picture too wide
C434 (0.0047, 1.6Kv) located near fly
(Mike Wilson)

Dell Monitor Model: D1025HT
Dim picture, looks like bad CRT
This is a common fault in this model and IC VPS12 is the main problem
(Imran Khan)

Dell Monitor Model: M781P (CM2317 Chassis)
No picture, chirping noise, green light flashes
Replace MTP6N60 near flyback on large heatsink
(Wendell)

Aoc Monitor Model: AOC (FCC ID: ARSCM3500 Chassis)
On switch on power LED flashing amber/orange, No Start up, but power available at main res capacitor C907
Check R904 for o/c (0.22Ohms), Q901 MOSFET (FS10UM) also shorted at all junctions. Use Equivalent IFR630 if Required
SAFETY NOTE: please ensure you discharge the mains reservoir capacitor before working in the area it will still have 300+ voltage charged. Use 10M Resistor on insulated crocodile clips and place on capacitor terminals. Ensure you remember to disconnect the resistor before switching on !
(Leon Guthrie - Electronics Technician), Borders college. Scotland)

Belinea Monitor Model: 10-40-10 (MPR II Chassis)
Green power LED flashing, no picture, flashing diminishes slowly after swithing off
330v ok at main reservoir capacitor C105 (150uF, 400v), Check diode D057 (UF3004) or use UF5408 as replacement. This brought back the screen but was reduced in width. Q001 was also faulty (F630), replaced with IRF630 this cured the fault
(Leon Guthrie, electronics tech - Borders college. Scotland)

Samsung Monitor Model: 551S
No power, fuse ok, noise from unit
Replace D606 and IC601 and it should be ok
(Maneco)

Hyundai Monitor Model: V580 (C15R08050 Chassis)
No power
Check the KA3843B for failure
(Anonymous)

Compaq Monitor Model: MV540
Dead with standby led going from green to orange as normal with no video input
The main PSU was dead but the standby psu was ok, R928 (620k) in the main PSU shutdown circuit was open circuit, its fed from the mains smoothing cap
(Owen O Reilly)

View sonic Monitor Model: E40
LED blinking and no display
Q801 was short circuit and IC801 had failed, after replacing both the short was removed but the value of resistor R812 (.24 ohms) was incorrect, replacing resolved the fault
(Mohammad Akram)

Hp m50 Monitor Model: D5258A (520X Chassis)
No raster or panel light, ticking noise
1.) Found Q502 Horizontal Output transistor had failed, Original part C5129, replaced it with type NTE2365
2.) Diode D509 had failed, Replaced
3.) Transistor Q104 was bad, Original part A1273. Replaced it with NTE12
4.) Q506 Mosfet transistor had failed, Original part IRF740. Replaced it with the same
(Anonymous)

Ctx Monitor Model: PR711F
BANG! followed by smoke, still operating after failure (promptly removed AC main power)
Replace C137, a 47uF 250v radial capacitor, was visibly blown
(Anonymous)

Gateway Monitor Model: EV900 (X19001)
Components VR501 (22K) and R573 (68k) in the ABL circuit burn out.
This is caused by the Flyback Transformer FEA-658. The transformer is available from Nikko Electronics @ £30 +VAT
(Ray)

Apple Monitor Model: M9101Z/C
Dead
Check R3121 (270Kohms, 1w, high voltage type) for open circuit which is located in the seperate side mounted p.s.u
(Josh)

Sony Monitor Model: GDM20SE2T5
Dark picture and jagged edges on both sides of the picture
Replace IC 007 on video board CXA1908S and replace all caps in the power supply (MUST do, all have high esr) Part can be ordered from www.powercomponents.nl, 1/3 of sony's price. Also check caps on other boards and cracks around the flyback
(Bart Bervoets)

Viewsonic Monitor VP181 Model: VLCDS21544-1M
Back light bulbs not working
Repaired inverter board
(Anonymous)

Sony Monitor Model: PVM1444QM
Top of picture is flipped
Change Q547 in the vertical circuit
(Francois)

Compaq Monitor Model: 15FS
Shadow of one of the colour guns across screen (brighter on right)
Small electros (22uF) on neck board
(Anonymous)

Kenitec Monitor Model: PX-14S
When cold picture jumps vertically
Vertical deflection IC (TDA1675) is temperature sensitive
(Jeroni Paul)

Ctx Monitor Model: VL700 (1795VL)
Power led on, EHT rustles up normally but no display
Checks around the tube base panel revealed that the 6V3 heater supply was reading around 1 volt. Replacing C125 (1000µF, 16V) which was leaky cured the fault
(Simon)

Essex Monitor Model: PV-7721M
Dead, 3A fuse blown
Check C510 & C511 (both 220µF 250V) for bulging can tops. If either is damaged, change both caps. Also IC501 (STR81145) will almost certainly be damaged and need replacing
(Simon)

Mag Monitor Model: Innovision 570V
Poor horizontal linearity, display cramped at both sides
Check relay RL601 for dry joints and poor internal switch contacts. Replace relay with RS 198-6905 if required
(Simon)

Ctx Monitor Model: 1569SE (Badged DAN)
Completely dead, no led lit
D407 (HER303) was short circuit, replaced with similar HER305. Also short circuit was Power FET Q401 (FS12UM-5), this is a 250V 12A device and proved difficult to obtain. Replaced with IRF644 (250V 14A). The monitor was now restored to normal working
(Simon)

Belinea Monitor Model: 10 40 10
No display, green power led flashes, flashing slowly diminishes when powering down
D152 (UF1007) on secondary side of chopper transformer was short circuit. Replacing with a BA159 cured the fault
(Simon)

Belinea Monitor Model: 10 20 10
Dead, power LED flashing and ticking noise
Q422 (2SC5297) Line Output Transistor was dead short. A replacement restored normal working
(Simon)

Aoc Monitor Model: Spectrum 5ELR
Display wobbles, hissing noise from PSU chopper transformer
Replacing C907 (220µF 400V) cured the fault
(Simon)

Kds Monitor Model: VS-7E
Dead set
Replaced Q412 type BU2520DF
(BenRose)

Quantex Monitor Model: XP170S
Tripping - off/on switch ind led flashing
Replace Q712 (IRF630)-leaky all round
(Anonymous)

Compaq 17" Monitor Model: V70
Image width / height increases / decreases
Replaced C851 (47uF, 250V)
(Alex Veltmans)

Tiny Monitor Model: A1770
Raster too wide, will not adjust and appears bowed
Q423 and R411 replaced
(Geoff)

Gateway Monitor Model: CPD-GF100
Field foldover on bottom of screen
Check capacitor C653 (470uF, 25v)
(Geoff)

Dell Monitor Model: D1025HE
Dead. No HT on Line output Transistor
Change R414 (220k) in the collector feed to TR404
(Susy Brown)

Sony Monitor Model: CPD-15SF1
Monitor shuts down just after pressing the power pushbutton, and the power on LED(green) and power save LED (yellow) both flash
The monitor started normally when pushing the power button twice. After troubleshooting found (Q001) spotkiller transistor was the reason, after replacement all was O.K
(Saudalhinai)

Apple Mac Monitor using a Radius Card in a 20 inch monitor
Unable to set Resolution
Switch off Hold down 'T' button then switch on
(Roger - STS)

Apple Monitor Model: 1710 (Sony Chassis)
No start or starting erratically
In the psu area Change the PTC (Burklin ref in Germany) and it's supply resistor
(Disco)

Gateway Monitor Model: EV 700A (LG CA-65 Chassis)
This monitor which appears under many guises (LG CB775N, Studioworks 775 etc.) had very low width and severe E/W distortion. On screen H.size adjustment had no effect
Replaced R736 (100K, 0.25W) which was O/C
(John @ WTVV)

CTX Monitor Model: VL700 (1769E)
Dead
Had nearly given up on this one till I got cct. for CTX1569! Original fault Q415 s/c and R474 burnt, no obvious shorts and replacements going same way shortly after switch on. Cause turned out to be C440 (10nF, 1kV) smoothing cap for G2 voltage leaky (reading 11K) also Q415 (BF488, used BF423 ok), R474 (33k, 0.5W), Same parts in CTX1569 are Q721, R761 and C733
Note there are different versions of this chassis depending on CRT and scan coil assembly type, one I had uses LG CRT and scan coil assembly and had board revision 11S31-069A REV: AS
(Kenny Cargill)

Philips Monitor Model: 7CM5279/00T
White raster with flyback lines on screen
This was due to low collector voltage on the video output transistors, replaced R3570 (0.68ohm)
(Anonymous)

JVC Monitor Model: TM1010P
Vertical scan collapse / horizontal black bars
Replace C416 with higher temp rating - goes low value due to proximity with v-drive heatsink
(Martin)

Elonex Monitors
A common fault on these monitors is flickering lines about an inch or two from the bottom of the screen
The solution to this is very simple. The heat produced by the frame I.Cs heatsink destroys C313. Replace this on the underside of the pcb along with R308 (2.2ohms) which will also be open circuit
(Peter. E)

Proview Monitor Model: 998M (PX-995 chassis)
Power Supply defective. Black lines on screen
The UC3842AN (KA3842B) was defective

After assembling there was no picture
Bad solder connections were found on the CRT board (No Heater voltage)
(Winter)

Hyundai Monitor Model: S450 (CKLS450 chassis)
Adjustment for v-size is limited. Vertical Raster is big. Other parameters are normal
Flash dead
(Roman)

KFC / Smile Monitor Model CK1450 / CK1420
Dead
Replace R531 (560k)
(Duncan Newell)

CTX 1765S Monitor
Over-bright display, with the brightness control having no effect.
R218, 390K, in the brightness circuit had gone o/c
(John Coles)

Kriteria Pixel

2009-02-19T15:54:00.000-08:00

Display LCD & TV LCD: kriteria pixel LCD

Nomer Artikel :5
Dibuat (tanggal) : 11/30/2004
Dimodifikasi (tanggal): 06/26/2007

Topik

Artikel ini memiliki penjelasan mendetail tentang bagaimana ViewSonic mendefinisikan kriteria pixel LCD untuk jaminan display panel datar LCD dan TV LCD.

Diskusi

ViewSonic berkomitmen penuh terhadap kepuasan pelanggan dengan memberikan produk dengan kualitas terbaik di industri. Hasilnya adalah display LCD kami secara umum memiliki sedikit sekali pixel yang gagal. Sebagai contoh, sebuah display 18” SXGA (1280x1024) memiliki hampir 4 juta sub-pixel. Sebuah produk yang memiliki 7 pixel yang gagal akan sama dengan 0.00018 persen dari total semua sub-pixel, angka yang sangat kecil.

(1280 Horisontal Pixel) * (1024 Vertikal Pixel) * (3 sub-pixel per pixel) = 3,932,160 sub-pixel

[(7 pixel gagal) / (3,932,160 sub-pixel)] * 100% = 0.00018%

Untuk memastikan display dengan kinerja tertinggi, ViewSonic membuat batas jumlah anomail pixel yang diperbolehkan. ViewSonic telah mengadopsi beberapa kriteria pixel berikut sebagai tambahan terhadap tiga tahun jaminan kami yang telah ada. Kebijakan ini berlaku bagi semua display LCD ViewSonic selama masa jaminan.

Model LCD lainnya

ViewSonic membatasi limit untuk LCD 14" - 15" 's pada 3 sub-pixel terang, 3 sub-pixel gelap, atau 3 sub-pixel kombinasi keduanya.
ViewSonic membatasi limit untuk LCD 17" - 19" 's pada 5 sub-pixel terang, 5 sub-pixel gelap, atau 5 sub-pixel kombinasi keduanya.
ViewSonic membatasi limit untuk LCD 20" atau yang lebih tinggi pada 7 sub-pixel terang, 7 sub-pixel gelap, atau 7 sub-pixel kombinasi keduanya.

Model TV LCD

ViewSonic membatasi limit untuk LCD 20" pada 0 sub-pixel terang, 5 sub-pixel gelap, atau 5 sub-pixel kombinasi keduanya.
ViewSonic membatasi limit untuk LCD 27" pada 0 sub-pixel terang, 6 sub-pixel gelap, atau 6 sub-pixel kombinasi keduanya.
ViewSonic membatasi limit untuk LCD 30" pada 0 sub-pixel terang, 6 sub-pixel gelap, atau 6 sub-pixel kombinasi keduanya.

Mungkin saja pada display pengganti memiliki beberapa sub-pixel gagal. Hal ini harus dipertimbangkan ketika meminta penggantian selama masa jaminan.

Penjelasan

Sebuah pixel atau elemen gambar, terdiri dari 3 sub-pixel warna utama, merah, hijau dan biru. Pada setiap pixel dalam sebuah AMLCD (active matrix liquid crystal display) monitor layar datar, dengan tiga sel material kristal cair sub-pixel dari warna merah hijau dan biru secara bersamaan memungkinkan timbulnya beragam warna dapat ditampilkan. Transistor individual dirangkai sebuah array di belakang kaca untuk mengendalikan setiap sub-pixel. Anomali pada satu dari transistor ini akan menyebabkan munculnya pixel terang atau gelap. Anomali ini secara umum hanya timbul ketika proses manufaktur, dan pixel gelap atau terang tambahan seharusnya tidak muncul di kemudian hari.

Jumlah pixel gagal yang diperbolehkan ini memiliki imbas langsung pada tingkat keberhasilan proses. Jika industri berusaha untuk membuat standar nol, maka tingkat keberhasilan industri saat ini akan lambat dan biaya untuk sebuah display LCD akan beberapa kali lipat lebih besar dari saat ini. Untungnya, kebanyakan pelanggan dan aplikasi cukup toleran dengan angka pixel gagal yang rendah dan lebih menyukai biaya yang rendah yang dimungkinkan oleh standar saat ini.

Informasi Dokumen
Produk yang dilingkupi: LCD Display,LCD TV
Kategori: Warranty & Service
Kata kunci: tv lcd pixel kriteria pixel mati

LCD TV paling tipis

2009-02-18T16:21:00.000-08:00

Kini telah hadir layar televisi terbaru buatan Samsung yang akan memecahkan rekor layar televisi LCD paling kecil dan paling ringan. Ukuran televisi tersebut 0,65 cm lebih tipis dari pada ukuran ponsel

Sejauh ini tak ada layar TV yang lebih tipis dari layar tersebut. Ketebalannya hanya sepertujuh LCD TV paling tipis sebelumnya Boerdeaux 850 yang juga buatan perusahaan elektronika Korea itu.

LCD dapat dibuat setipis mungkin karena mengadopsi teknologi sistem backlight berbasis LED (light emitting diode). LC TV ini akan tersedia dalam ukuran layar dari 40-55 inci yang akan dipamerkan pertama kali pada Consumer Electronics Show 2009 di Las Vegas 8-11 Januari mendatang.

sumber : kompas

Perbedaan TV Lcd dan Plasma

2009-02-17T16:19:00.000-08:00

Mana yang lebih baik untuk anda? Plasma atau LCD?
Baik plasma ataupun LCD merupakan standard display flat panel, namun terdapat perbedaan di antara keduanya. Plasma dan LCD mungkin tampak sama, namun layar plasma menggunakan matrix dari gas plasma cell yang tipis yang dihasilkan oleh tenaga elektrik untuk membuat gambar. Layar LCD (Liquid Crystal display) seperti bentuk sandwich yang dibuat dari crystal liquid, yang dimasukkan ke dalam ruang di antara dua piringan cermin. Gambar dalam LCD dibuat oleh banyaknya tenaga elektrik yang diaplikasikan ke dalam crystal.
Keakuratan.Layar plasma memiliki batasan yang lebih tinggi melebihi LCD. Hal ini dikarenakan layar plasma memiliki display hitam lebih akurat daripada LCD, yang berarti kontras dan warna hitam televisi atau film yang lebih baik. Teknologi LCD lebih alami, di mana terdapat lapisan yang bercahaya yang ada di layar LCD, yang berarti akan sangat sulit untuk menghasilkan warna yang benar-benar hitam karena akan selalu ada pijaran cahaya yang ada di antara piksel.
Sudut pandang.Terlepas dari kontras yang lebih baik untuk menampilkan hitam yang lebih hitam, layar plasma memiliki sudut pandang yang lebih baik daripada LCD. Sudut pandang di sini diartikan dalam posisi duduk user dari sisi manapun dapat melihat kualitas gambar yang sama. User akan mendapatkan warna yang lebih terang ketika duduk terlalu jauh dalam sudut pandang LCD, sedangkan layar plasma lebih solid dalam menghadirkan warna dari berbagai sudut.
Konsumsi energi. Layar plasma masih memiliki batasan dalam kualitas gambar, sedangkan LCD mampu memberikan resolusi yang lebih baik. Bila dibandingkan dengan layar TV 15 inch hingga 42 inch, LCD mampu menghadirkan sesuatu yang slim dan penuh warna, juga lebih murah. LCD memiliki piksel yang lebih banyak daripada plasma dalam ukuran yang sama. LCD juga menggunakan energi yang lebih sedikit sekitar 30% energi daripada plasma.LCD juga lebih ringan daripada plasma dalam ukuran yang sama, sehingga lebih mudah untuk dipindahkan ke mana saja.
Ketahanan. LCD memiliki ketahanan yang lebih lama daripada layar plasma. Sejak plasma model pertama, plasma telah kehilangan setengah efek cahaya setelah lebih dari 20.000 jam penggunaan. Sedangkan LCD mampu bertahan lebih lama sekitar 60.000 jam. Plasma juga dapat mengalami seperti layar yang terbakar ketika gambar terlalu lama di layar, sehingga menghasilkan bayangan dari gambar tersebut secara permanent. Walaupun plasma yang baru memiliki fitur screensaver, namun gambar yang seperti terbakar tersebut masih menjadi masalah.
Kualitas gambar. Layar plasma dapat memproduksi warna yang lebih terang daripada LCD. Layar LCD memiliki tendensi untuk menampilkan gambar blur, yang akan tampil selama pergerakan scene yang cepat dalam film atau olahraga. Layar LCD model terbaru telah mengalami improvisasi yang signifikan. Oleh karena itu, jika user hendak membeli LCD, user dapat mengecek waktu respon piksel (dalam ms). Semakin rendah waktu respon piksel, semakin bagus kualitas gambar dalam pergerakan scene yang cepat.
Tip menentukan pilihan, Jika anda menginginkan TV dengan ukuran kecil atau dibawah 50 inch maka LCD adalah pilihan terbaik mengingat harga LCD untuk ukuran tersebut jauh lebih murah bahkan semakian murah saat ini.
Jika anda menginginkan TV berukuran besar atau lebih dari 50 inch maka kami menyarankan anda untuk membeli Plasma karena harga Plasma untuk ukuran diatas 50 inch jauh lebih murah dibandingkan dengan LCD.
Terlepas Plasma atau LCD yang anda akan beli, pastikan bahwa TV tersebut mempunyai intergrated/ digital tuner (bukan analog) untuk mendapatkan hasil gambar yang lebih baik. Diposkan oleh PURWANTORO di 17:40

Tip membersihkan layar LCD

2009-02-17T16:15:00.001-08:00

Merawat LCD…???
Hmmm… gampang-gampang susah khan
Siapa sich yang tidak kenal dengan LCD Screen sekarang ini? Mulai dari gadget kecil hingga LCD TV ukuran raksasa, teknologi ini sudah begitu menyatu dalam kehidupan para pencinta elektronik maupun pengumpul gadget.

Ada 2 Jenis LCD yang umum digunakan :

Clear View atau lebih mudah dikenali dari teksture permukaannya yang licin/gloss, seperti plastik mika.
Matte, permukaan ini bila diraba akan terasa seperti ada teksture-nya dan tidak memantulkan cahaya/Matte.

Untuk jenis yang pertama biasanya digunakan oleh kebanyakan laptop, mungkin untuk membersihkannya tidak terlalu sulit, karena gunakan lap yang agak basah dengan cairan pembersih biasa pun akan sangat mudah untuk dibersihkan.

Namun untuk jenis yang kedua, biasa banyak digunakan pada layar touch screen PDA/Archos touch screen/LCD monitor/ LCD TV. Permukaannya mempunyai tekstur matte dan juga seperti ada pori-pori. Mungkin banyak juga penggunanya yang seringkali agak kesulitan membersihkannya, karena jika kita gunakan cairan pembersih biasa, seringkali meninggalkan noda setelah mengering dan tentunya perangkat mahal pun akan terlihat dekil dan tidak sedap dipandang.

Saya pernah mencoba menggunakan produk dari STP yaitu Son Of A Gun, memang cukup efektif juga menggunakan cairan ini, jika kita menggunakannya dengan merata dan dalam keadaan device kita tsb tidak sehabis dipakai alias dingin. Karakteristik Son Of A Gun ini juga memberikan semacam protective layer pada LCD Screen.

Namun masalah akan muncul jika device tsb. menghasilkan panas, seperti pada LCD TV/PDA/Archos, karena protective layer tsb akan meleleh dan LCD Screen akan seperti lengket…. tentunya jika cairan tsb. masuk ke dalam circuit device anda, entah apa jadinya

Sekitar bulan Agustus 2008, saya menemukan cairan pembersih head printer (pada mulanya emang saya cari untuk inkjet Epson yang lagi ngadat), setelah baca keterangannya, pembersih ini mempunyai kadar keasaman (pH) yang netral, bisa digunakan untuk membersihkan LCD. Karena penasaran….saya coba untuk membersihkan LCD Monitor, wah….!!! Ternyata emang jadi kinclong, tapi koq sesudahnya LCD Screen terlihat berminyak tadinya saya bermaksud me-lap LCD Screen tsb, tapi berhubung ada telepon masuk saya jadi kelupaan. Seteleh sekitar 30 menit kemudian saya baru teringat untuk membersihkannya, tapi…… terlambat sudah…… LCD Screen Monitor yang sudah berumur 3 tahun tsb. kini benar-benar jadi kinclong lagi….. seperti baru buka dari dus…… cairan yang tadinya seperti minyak/pelembab tsb. hilang dengan sendirinya…!!! (Tentu dalam hal ini LCD anda sebelumnya dalam keadaan mulus, kalo lecet mah jangan harap bisa mulus lagi).

Dan meski saya tidak dibayar sepeser pun untuk ulasan ini, saya berbagi saja dengan anda, cairan ini bernama Dr. Winston, bisa anda temukan di toko-toko yang menjual inkjet paper, printer, komputer. Harganya sich berkisar Rp.60.000,- untuk 75ml.

Dan saya gunakan juga untuk membersihkan LCD mobile phone/PDA, Casing Computer… ternyata aman… TAPI….hati-hati…!!! Jangan untuk barang yang mempunyai merk sablon…!!! Itu terjadi pada LCD TV 9inch buatan China yang merk-nya disablon oleh importirnya… merk tsb. benar-benar ikut bersih juga….alias terhapus….

Ya kagak salah juga sich…. head inkjet Epson yang mampet aja dia terjang… apalagi tinta sablon…

Okay…. selamat mencoba…..

Mengatasi Monitor Buram

2009-02-16T16:27:00.000-08:00

1.Mengatasi Monitor Buram

Salah satu penyebab monitor CRT (tabung) displaynya buram atau tidak fokus adalah lemahnya bagian komponen Flyback. Komponen ini mudah dikenali, bentuknya hitam dengan salah satu outputnya nempel di tabung monitor. Bentuknya mirip koil dari sepeda motor anda. Flyback memiliki dua pengatur yaitu untuk pengatur fokus dan untuk pengatur terang redupnya display. Biasanya untuk masalah monitor buram yang usianya dibawah tiga tahun, untuk mengatasi buramnya display bisa dengan mengatur fokus dari flyback. Letak pengatur fokus flyback biasnya dibagian atas sedangkan untuk pengatur redup terang di bagian bawah. Putar pengatur fokus sampai posisi yang terbaik. Hati-hati dalam memutar pengatur fokus ini karena kondisi monitor sedang nyala. Bisa menggunakan obeng min atau plus untuk keamanan. Tes kondisi fokus hasil pengaturan tadi beberapa jam, kalau monitor buram atau tidak fokus kembali setelah panas berarti kondisi flybacknya sudah parah. Penyetingan fokus sudah tidak bisa dilakukan. Tapi jangan khawatir monitor buram anda masih bisa diselamatkan. Jika kondisi ini terjadi anda harus mengganti flyback. Cuma masalahnya jenis flyback dengan tipe yang sama suka jarang di pasaran. Langkah yang bisa dilakukan adalah melakukan "pencangkokan flyback". Yaitu sebuah trik untuk mengatasi lemahnya komponen pengatur fokus pada flyback. yaitu dengan menggabung flyback lama dengan flyback baru yang fokusnya bagus. flyback baru untuk cangkokan boleh berbeda type dengan yang di cangkok.

2.Cangkok Fly back

Jika cara pertama tidak berhasil maka kita harus melakukan pen-cangkokan fly back. Itu klo kita tidak berhasil menemukan fly back dengan seri dan tipe yang sama.

bentuk trafo fly back

Peralatan dan bahan yang nt butuhkan diantaranya;

solder, timah secukupnya, kabel tunggal (NYAF) +/- 60 cm, tang lancip, cutter, isolasi, lem besi dan flyback cangkok (sembarang/terserah anda).

Untuk perhatian agar tidak langsung menyentuh bagian kop flyback yang menuju tabung CRT karena masih menyimpan muatan listrik,untuk membuang muatan listriknya lakukan hubung singkat (short circuit) dengan Ground melalui perantara kabelCaranya: ambil kabel 0,5 m kupas lilitkan ke obeng -, ujung satunya hubungkan ke kabel degaussing monitor.Setelah itu buka kop kabel fly back dengan obeng - sentuhkan obeng ke inti kabel, jika fly back masih menyimpan arus listrik maka akan keluar percikan api ketika obeng menyentuh inti kabel.

Lepas kop fly-back dari tabung CRT kemudian lepas pula kabel (yg biasanya berwarna merah) dari kopnya, intinya kita akan memasukkan dua buah kabel (warna merah – dari 2 buah fly-back) ke dalam satu kop. Untuk persiapan pada fly-back cangkok, hubung singkatkan semua kaki-kaki flyback dengan kabel dan disolder kemudian berikan kabel penghubung untuk nantinya disambung ke Ground monitor.

Karena kita akan memasukkan 2 buah kabel ke dalam satu kop maka lakukan pengecilan diameter isolasi kabel fly-back dengan mengirisnya sedikit demi sedikit dengan cutter(hingga lapisan pertama), ini dilakukan supaya 2 buah kabel tsb bisa masuk ke dalam satu kop. Peralatan yang anda bisa gunakan untuk langkah ini ialah menggunakan tang lancip, tang potong, cutter dan solder.

Gunakan kreatifitas dan inisiatif anda didalam mempraktekkan langkah2 diatas, karena tidak ada cara yg baku untuk kasus ini, sehingga keterampilan anda akan terlatih untuk berkembang. Anda bisa meng-Isolasi hasil penggabungan 2 buah kabel yang dimasukkan ke dalam satu kop untuk keamanan, mengingat akan dialiri oleh tegangan yg cukup tinggi.

Selanjutnya, sambungkan kabel penghubung dari kaki-kaki flyback untuk ground yang sebelumnya telah dipersiapkan menggunakan solder.

Posisikan flyback tambahan (cangkok) dengan aman di jeroan monitor dan bila perlu diperkuat dengan kabel ties.

Lepas 2 buah kabel yang menjulur dari flyback (asli) ke Blok RGB (biasanya bernama ”Screen” dan ”Focus”), kemudian digantikan dengan milik fly-back hasil cangkok.

Letak perbedaan 2 kabel ini (screen dan focus) ialah pada ukuran diameter kabel, dimana salah satunya lebih besar untuk menunjukkan perbedaaanya.

Anda bisa mengisolasi kabel screen dan focus milik fly-back (asli) yg telah dilepas dari BlokRGB, karena sudah tidak difungsikan.

“Perhatian”

Periksa ulang langkah-langkah diatas sebelum mencoba meng-ON-kan monitor, karena penulis tidak bertanggung jawab atas kecelakaan fatal yg disebabkan kelalaian anda didalam mempraktekkan, diantaranya : • Apakah 2 kabel yang masuk ke dalam kop dari 2 fly-back sudah benar ?

pastikan sambungannya kokoh dan bila perlu diisolasi, kemudian masukkan kop dengan benar ke tabung CRT.

• Pastikan semua kaki-kaki flyback cangkok di short-kan (hubung-singkat) yang kemudian dihubungkan dg kabel ke Grounding monitor.

• Penggantian kabel screen dan focus pd Blok RGB dari flyback (asli) dengan milik flyback cangkok pastikan tidak tertukar, kemudian isolasi kabel screen dan focus milik flyback (asli) yg sudah tidak difungsikan untuk pengamanan.

• Pastikan kedudukan / posisi flyback cangkok pada posisi yg aman dan strategis(untuk dijangkau).Terakhir, ON-kan monitor berikut CPU, atur kecerahan dan focus gambar melalui potensiometer pada flyback hasil cangkok, untuk hal ini anda bisa melihat-lihat kembali artikel sebelumnya

Sumber: www.ilmukomputer.com

www.ilmukomputer.com

Kerusakan pada Trafo flyback

2009-02-15T20:36:00.000-08:00

Flyback transformer ialah salah satu komponen yang terdapat pada sebuah Monitor komputer atau Televisi yang menggunakan teknologi CRT atau layar tabung.

Anda pasti pernah mendengar istilah Flyback atau FBT (Flyback transformer).

FBT banyak di jual di pasaran namun untuk mendapatkan yang sesuai dengan part number yg anda butuhkan mungkin ini adalah kendala yg paling klasik yg sering dihadapi oleh para repairman atau teknisi ..sebetulnya ada trik untuk menyiasatinya namun kali ini saya memberikan informasi sekilas saja mengenai permasalahan permasalahan yang sering terjadi pada komponen FBT khususnya pada Monitor CRT Computer.

Pada saat ini beberapa Monitor mempunyai banyak masalah dgn flyback transformer .

Pada beberapa kasus flyback dapat mengalami short circuit setelah penggunaan lebih dari 2 thn.ini disebabkan oleh material dgn kwalitas rendah.

sekarang pertanyaannya adalah permasalahan seperti apa yg terjadi pd flyback dan bagaimana mengukur atau mengeceknya dan kapankah perlu diganti.

Berikut ini penjelasan yg dapat membantu anda mengidentifikasi beberapa permasalahan pada flyback.

Terdapat 9 Permasalahan yg biasa ditemukan pd flyback problem

1. Short pada lilitan/kumparan primer

2. Capasitor di bagian sekunder pada kondisi open atau short

3. Flyback transformer menjadi menggelembung atau retak seperti hamper pecah

4. Bagian Luar arching short ke ground

5. Bagian dalam arcing diantara lilitan

6. Short di bag dalam high voltage diode pada lilitan/kumparan sekunder

7 Gangguan pada pembagi voltage focus atau screen yg menyebabkan tampilan menjadi blur

8. Kerusakan FBT pd saat full operating voltage (Rusak ketika underload)

9. Short circuit antara lilitan / kumparan primer dan sekunder

Contoh macam jenis kerusakan / sytmptom yg terjadi pd kondisi Short pada lilitan primer

A) Blank ( No display dan tdk ada High Voltage )

B) Power Blink

C) Tegangan B + drop

D) Horz output transistor menjadi semakin panas dan kemudian short

E) Di sepanjang jalur B+ line terdapat komponen yg meletup,short ,jebol atau terbakar contoh komponen : Dioda U, Fet IRF 630,Elco 47Uf/160V,dll

F) Kadang2 Mengakibatkan Blok Power supply (Regulator ) beberapa komponen terbakar

Contoh macam jenis kerusakan / sytmptom yg terjadi pd kondisi Capasitor di bagian dalam FBT short

A) Blank ( No display dan tdk ada High Voltage )

B) Tegangan B+ Drop

C) Dioda pd Bagian Sekunder terbakar atau short

D) Horz output transistor akan mudah atau sering putus / short

E) Power Blink

F) Kadang2 komponen pada Circuit ABL terbakar atau short ( Lokasi circuit ini biasanya terdapat di sebelah / di samping FBT Contoh ( Mon LG 520 Si )

G) Bagian Power Mati / Shut down (contoh Compaq V55 / Samtron 4bi)

H) Kadang2 Mengakibatkan Blok Power supply (Regulator ) beberapa komponen terbakar ( Contoh Raffles 15 “)

Contoh macam jenis kerusakan / sytmptom yg terjadi pd kondisi Capasitor di bagian dalam FBT kondisi Open ;

A). Tidak ada High Voltage ( shutdown )

B) Terdengar suara “Tik..Tik..Tik “ Apabila kita ukur Capasitor kemungkinan OK namun break down pada kondisi full operating voltage

c) Horz output Transistor akan short dalam beberapa jam atau hitungan hari setelah anda mengganti transistor tersebut.

D).Terkadang akan menyebabkan intermittent “No display”

E) Gambar yang Terdistorsi

F) Kadang2 Mengakibatkan Blok Power supply (Regulator ) beberapa komponen terbakar

Sumber: zhillanku.multiply.com

Samsung L6b service menu

2009-02-15T16:12:00.000-08:00

1. Mengaktifkan servis menu
ketika menu tampil di layar tekan angka 9, 3, 0, 1 pada remote control.
dengan cara ini servis menu akan aktif.
2. Struktur servis menu
servis menu mempinyai 3 item: dsplay, kalibrasi dan versi
2.1 Display
Display mempunyai 7 pilihan
a. Panel
b. Power on time
c. Backlight on time
d. Scart prescale
e. Nicam prescale
f. Fm/am prescale
g. Agc (automatic gain control)
h. R/G/B brightnes/contrast

2.3 Kalibrasi
Kalibarasi mempunyai 9 pilihan
a. Video format
b. colorspace
c. Test pattern
d. Color component
e. Solid field level
f. initial ATS
g .Factory preset
h. dpms
i. osd timeout

2.3 Version

semoga bermanfaat.