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Repair tips

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

MakeModelProblemSolutionDate
Found: 4551
PhilipsG90AEBlank raster - Txt OKpin 7 TDA3561A was -ve instead of 3.4v; C2560 33nF o/c14-09-04
PhilipsG90AEBlank raster & no soundTDA585014-09-04

PhilipsG90AEBlank raster , no sound , no OSD.IC TMP47C434N-3555 IC7720.14-09-04
PhilipsG90AEBlank raster with no sound. OSD or response to R/CIC7720 reset line pin 33 stuck at 2v - chip had internal leak TMP47C434N-355514-09-04
PhilipsG90AEBLANK SCREEN NO SOUNDRESET AT 2v IC7720 PIN 33 IF DROPS WHEN PIN 33 ISOLATED REPLACE IC TMP47C434N-355514-09-04
PhilipsG90AEBlocks/Wrong OSD-indicationDisconnect 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
PhilipsG90AECharacters wrongReplace IC 7820 (SAA 5243P/E; 4822 209 30556) and replace IC 7800 (MAB 8461P/W196; 4822 209 62479)14-09-04
PhilipsG90AECogging effectC2630 47µ 160v HT res cap also change C2631 smoother14-09-04
PhilipsG90AEDark picture - no remote commands.Replace IC 7720.14-09-04
PhilipsG90AEDeadD6617 6v2 zener s/c; R3668 150R sm dry joint14-09-04
PhilipsG90AEDead - BIT11AF chopper s/c fit repair kitPt 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
PhilipsG90AEDead - blows BUT11AF chopper even with kit fittedo/c between pin 18 of chopper tfrmr & D6645 due to o/c sm link 364514-09-04
PhilipsG90AEDead - Full HT 95v with 120v ac I/pHT reduces as mains I/p is increased - D6653 BAS32 in psu sec s/c14-09-04
PhilipsG90AEDead - mains fuse shatteredBUT11AF 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/BY14-09-04
PhilipsG90AEDead - no 95v HT to LOP stageCrack in print by runner at edge of pcb in 95v supply line14-09-04
PhilipsG90AEDead - no HT but present on dummy loadLOPTx faulty also Line osc IC had dist waveform o/p - chip faulty14-09-04
PhilipsG90AEDead - no o/p from psuThy 6670 SFOR5D43 s/c14-09-04
PhilipsG90AEDead - PSU o/ps lowTr7654 BC847C leaky14-09-04
PhilipsG90AEDead - s/c on lop stageLOPTx faulty though tested ok on tester14-09-04
PhilipsG90AEDisplay - shows F4 or F7.Replace IC 7720.14-09-04
PhilipsG90AEDisplaying 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
PhilipsG90AEDoes not functionVoltage +95 V not present Mount SOPS repair kit (SBC 7023; codenumber 4822 310 20496)14-09-04

PhilipsG90AEDoes not function wellWrong 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
PhilipsG90AEDoes not tune optimallyRe-adjust S5034 and S5035. See service manual CHASSIS G90AE (4822 727 16447) page 4 points 10 and 11.14-09-04
PhilipsG90AEError code F7 after loptx replacementF7 code denotes fault in Txt - C2843 220µ 16v & replace C2640 & C2660 680µ14-09-04
PhilipsG90AEF7 displayed, no snd, pic ok. (all OK when warm)C2843 (220uf 25V; 4822 124 41545). 14-09-04
PhilipsG90AEFault codes F4 or F7 with no sigs & LED orangeEEPROM or Txt chip faulty - use of heat & freezer usually determines faulty comp. If reset with EEPROM chip hot does not work then chip is faulty14-09-04
PhilipsG90AEField collapseWickman fuse in supply to FOP chip o/c but R3503 & 3507 22R overheat when fuse replaced - R3501 390R leaky14-09-04
PhilipsG90AEField reduced height with top foldoverR3508 24k hi res14-09-04
PhilipsG90AEFlash-overs on the CRT board.Replace C2397 by a new type code 4822 121 41926. REMARKS : The code number published in the report "complaints of the steco segment" dated 1992-02-14 was not correct. Production has been adapted from week 9149 onwards.14-09-04
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