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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 128
Philips
G90AE
Blank raster - text Ok.
C2569 ( 33nf ) o/c.
14-09-04
Philips
G90AE
Blank raster - Txt OK
pin 7 TDA3561A was -ve instead of 3.4v; C2560 33nF o/c
14-09-04
Philips
G90AE
Blank raster & no sound
TDA5850
14-09-04
Philips
G90AE
Blank raster , no sound , no OSD.
IC TMP47C434N-3555 IC7720.
14-09-04
Philips
G90AE
Blank raster with no sound. OSD or response to R/C
IC7720 reset line pin 33 stuck at 2v - chip had internal leak TMP47C434N-3555
14-09-04
Philips
G90AE
BLANK SCREEN NO SOUND
RESET AT 2v IC7720 PIN 33 IF DROPS WHEN PIN 33 ISOLATED REPLACE IC TMP47C434N-3555
14-09-04
Philips
G90AE
Blocks/Wrong OSD-indication
Disconnect pins 2 and 3 IC 7800 (TXT-uP), set functions normally. Replace IC 7800 (MAB 8461P/W196; 4822 209 62479). Mount metal shielding 4822 466 82783 on uP (IC 7720) with earth to jumper 9711.
14-09-04
Philips
G90AE
Characters wrong
Replace IC 7820 (SAA 5243P/E; 4822 209 30556) and replace IC 7800 (MAB 8461P/W196; 4822 209 62479)
14-09-04
Philips
G90AE
Cogging effect
C2630 47µ 160v HT res cap also change C2631 smoother
14-09-04
Philips
G90AE
Dark picture - no remote commands.
Replace IC 7720.
14-09-04
Philips
G90AE
Dead
D6617 6v2 zener s/c; R3668 150R sm dry joint
14-09-04
Philips
G90AE
Dead - BIT11AF chopper s/c fit repair kit
Pt no 4822 310 20496 tells you to fit 2 x 1N5061. Connect in series between chopper tr base - emitter (anode to base)
14-09-04
Philips
G90AE
Dead - blows BUT11AF chopper even with kit fitted
o/c between pin 18 of chopper tfrmr & D6645 due to o/c sm link 3645
14-09-04
Philips
G90AE
Dead - Full HT 95v with 120v ac I/p
HT reduces as mains I/p is increased - D6653 BAS32 in psu sec s/c
14-09-04
Philips
G90AE
Dead - mains fuse shattered
BUT11AF s/c - fitted repair kit & dry joint R3610 24k; 3 x BZV55/F33 6657/8/9 s/c sm. MAKE SURE SET IS NOT IN ST/BY WHEN CHECKING- IF SW OFF OIN ST/BY WILL COME BACK ON IN ST/BY
14-09-04
Philips
G90AE
Dead - no 95v HT to LOP stage
Crack in print by runner at edge of pcb in 95v supply line
14-09-04
Philips
G90AE
Dead - no HT but present on dummy load
LOPTx faulty also Line osc IC had dist waveform o/p - chip faulty
14-09-04
Philips
G90AE
Dead - no o/p from psu
Thy 6670 SFOR5D43 s/c
14-09-04
Philips
G90AE
Dead - PSU o/ps low
Tr7654 BC847C leaky
14-09-04
Philips
G90AE
Dead - s/c on lop stage
LOPTx faulty though tested ok on tester
14-09-04
Philips
G90AE
Display - shows F4 or F7.
Replace IC 7720.
14-09-04
Philips
G90AE
Displaying error code F7 extremely intermittently.
Error code denotes fault in text circuit. If possible when fault condition present, check +5 volts to text chips. If 5 volts is missing, check/replace SMD link - 3901 in text circuit.
14-09-04
Philips
G90AE
Does not function
Voltage +95 V not present Mount SOPS repair kit (SBC 7023; codenumber 4822 310 20496)
14-09-04
Philips
G90AE
Does not function well
Wrong characters on screen. Replace IC 7720 by repairkit 4822 310 31848 This repairkit consists of IC7720 (TMP47C434N-3555) and a metal shielding.
14-09-04
Philips
G90AE
Does not tune optimally
Re-adjust S5034 and S5035. See service manual CHASSIS G90AE (4822 727 16447) page 4 points 10 and 11.
14-09-04
Philips
G90AE
Error code F7 after loptx replacement
F7 code denotes fault in Txt - C2843 220µ 16v & replace C2640 & C2660 680µ
14-09-04
Philips
G90AE
F7 displayed, no snd, pic ok. (all OK when warm)
C2843 (220uf 25V; 4822 124 41545).
14-09-04
Philips
G90AE
Fault codes F4 or F7 with no sigs & LED orange
EEPROM or Txt chip faulty - use of heat & freezer usually determines faulty comp. If reset with EEPROM chip hot does not work then chip is faulty
14-09-04
Philips
G90AE
Field collapse
Wickman fuse in supply to FOP chip o/c but R3503 & 3507 22R overheat when fuse replaced - R3501 390R leaky
14-09-04
Philips
G90AE
Field reduced height with top foldover
R3508 24k hi res
14-09-04
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