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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
PhilipsG90Bno txt when heatedSAA5243P/E txt processor14-09-04
PhilipsG90BNo TXT; Error code F7 displayed.Missing reset pulse on pin 17 of IC7800 of the TXT panel. Check C2845 (100 uF) in the reset circuit.14-09-04

PhilipsG90BNo TXT; oscillator on TXT decoder does not function.Add C2802, C2803 15pF (4822 122 32504) on the teletext module U1003.14-09-04
PhilipsG90BNo vertical deflection+200 V(163) not present Replace R 3570 (8,2 Ohm; 4822 052 10828)14-09-04
PhilipsG90BNo vertical deflectionVertical signal on pin 1 IC 7470 present Check/replace TS 7502 (BD 939F; 4822 130 42681) Check/replace TS 7503 (BD 939F; 4822 130 42681)14-09-04
PhilipsG90BPage 811 appears spontanuouslyDecoder selects page 811 and blocks Mount new uP (IC 7800) MAB 8461P/W196 (4822 209 62479) on TXT-Decoder.14-09-04
PhilipsG90BPower supply failureIn the event of a failure in the switch-mode power supply, the switching transistor IC7625 may have failed. In this case it is recommended that the opto-coupler IC7614 should also be replaced. 7625: BUT11AF; 4822 130 42679 7614: CNX83A; 4822 130 8203414-09-04
PhilipsG90BRemote - faulty hand unit - its glued.Remove name plate strip drill hole 1cm in from recess.14-09-04
PhilipsG90BSet blocked; no control of functions.Check solder joints of resonator 1760. 14-09-04
PhilipsG90BSeverel patterning apparent on the picture.If the pattern is also apparent in teletext mode and external mode, suspect decoupling fault from SOPS. Scope on C2660 - 8 volt feed to 5 volt regulator. If ripple is apparent replace C2660 - 680 uF Codenr. 4822 124 40199 or 1500 uF Codenr. 4822 124 40414-09-04
PhilipsG90BSlow start, led blinking in stand-by modeTR7455 (BC858A; 5322 130 42012) interrupts from time to time. 14-09-04
PhilipsG90BSound mutes spontanuouslyMount two capacitors of 100 nF (5322 121 42578; in parallel) between pin 10 IC 7220 (stereo decoder) and earth.14-09-04
PhilipsG90Bsound slow to come on & no txtC2846 220µ14-09-04
PhilipsG90BSpare part informationSpare part information The original TDA8153 (4822 209 73218), on the picture tube panel, is not available anymore A re-disigned complete picture tube panel with discrete components is available now with codenumber: 4822 212 22979. This panel is supplie14-09-04
PhilipsG90BSt/by onlyEEPROM 20C0214-09-04
PhilipsG90BTrips violentlyTr7652 BC858C overheating in opto coupler drive cct - Tr leaky14-09-04
PhilipsG90BTuning unstableVoltage on D 6004 (LLZ-C35) fixed Replace U 1000 (UV 816; 4822 210 10365)14-09-04
PhilipsG90BTuning unstableIn some instances it may be found that customers complain of tuning drift on the G90 chassis. This has been found to be due to a specific batch of zener diodes fitted in position D6770 becoming faulty. When replacing this diode the same type (ZTK33B code14-09-04
PhilipsG90BTxt - dist characters/excess contrast/crushed/no colDry joints on daughter board between main pcb & Txt/Nicam panels14-09-04
PhilipsG90BTXT has too low contrastRemove diode 6813 (BZV55-C7V5) from textdecoder unit 1996. 14-09-04
PhilipsG90BVertical stripes on the left side.Check capacitor C2580 (470 uF; 4822 124 40198).14-09-04
PhilipsG90BBlank screen no sound ht lowC2660 680µ16v 5v res cap14-09-04

PhilipsGFL2.20dead - mains switch faultyreplace switch with improved type (coloured black). Use old part no, Philips will supply a new type14-09-04
PhilipsGFL2.20E 29PT828CdeadR3528 39k o/c14-09-04
PhilipsGFL2.20E 29PT828Cdead, green LED flashingR3148 120k gone high (large signal panel)14-09-04
PhilipsGFL2.20E 29PT828Cdead, LED flashingFrame IC TDA8177 and C2260 100uF 63V14-09-04
PhilipsGFL2.20E 29PT828Cno sound from front speakers in dolby or surround modesgo to install menu, then TV config menu and set "external amp" to off14-09-04
PhilipsGFL2.20E 29PT828Cquiet buzz from centre speaker when playing back VCR via SCARTunclip the features board mounted behind the LOPTx on a plastic frame, turn through 180 degs and clip back into its frame (it works)14-09-04
PhilipsGFL2.20E 29PT828Cset trips from green LED to red, then back green to redIC 7540/7550 TDA2616Q on audio PCB14-09-04
PhilipsGFL2.20E 29PT828Csound int. goes low and distorted, rear speakers cracklingresolder earth links on component side of dolby module14-09-04
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