| Make | Model | Problem | Solution | Date |
| | | |
| Found: 4551
|
| Philips | G90B | no txt when heated | SAA5243P/E txt processor | 14-09-04 |
| Philips | G90B | No 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 |
| Philips | G90B | No TXT; oscillator on TXT decoder does not function. | Add C2802, C2803 15pF (4822 122 32504) on the teletext module U1003. | 14-09-04 |
| Philips | G90B | No vertical deflection | +200 V(163) not present Replace R 3570 (8,2 Ohm; 4822 052 10828) | 14-09-04 |
| Philips | G90B | No vertical deflection | Vertical 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 |
| Philips | G90B | Page 811 appears spontanuously | Decoder selects page 811 and blocks
Mount new uP (IC 7800) MAB 8461P/W196 (4822 209 62479) on TXT-Decoder. | 14-09-04 |
| Philips | G90B | Power supply failure | In 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 82034 | 14-09-04 |
| Philips | G90B | Remote - faulty hand unit - its glued. | Remove name plate strip drill hole 1cm in from recess. | 14-09-04 |
| Philips | G90B | Set blocked; no control of functions. | Check solder joints of resonator 1760.
| 14-09-04 |
| Philips | G90B | Severel 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 124 404 | 14-09-04 |
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| Philips | G90B | Slow start, led blinking in stand-by mode | TR7455 (BC858A; 5322 130 42012) interrupts from time to time.
| 14-09-04 |
| Philips | G90B | Sound mutes spontanuously | Mount two capacitors of 100 nF (5322 121 42578; in parallel) between pin 10 IC 7220 (stereo decoder) and earth. | 14-09-04 |
| Philips | G90B | sound slow to come on & no txt | C2846 220µ | 14-09-04 |
| Philips | G90B | Spare part information | Spare 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 supplie | 14-09-04 |
| Philips | G90B | St/by only | EEPROM 20C02 | 14-09-04 |
| Philips | G90B | Trips violently | Tr7652 BC858C overheating in opto coupler drive cct - Tr leaky | 14-09-04 |
| Philips | G90B | Tuning unstable | Voltage on D 6004 (LLZ-C35) fixed Replace U 1000 (UV 816; 4822 210 10365) | 14-09-04 |
| Philips | G90B | Tuning unstable | In 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 code | 14-09-04 |
| Philips | G90B | Txt - dist characters/excess contrast/crushed/no col | Dry joints on daughter board between main pcb & Txt/Nicam panels | 14-09-04 |
| Philips | G90B | TXT has too low contrast | Remove diode 6813 (BZV55-C7V5) from textdecoder unit 1996.
| 14-09-04 |
| Philips | G90B | Vertical stripes on the left side. | Check capacitor C2580 (470 uF; 4822 124 40198). | 14-09-04 |
| Philips | G90B | Blank screen no sound ht low | C2660 680µ16v 5v res cap | 14-09-04 |
| Philips | GFL2.20 | dead - mains switch faulty | replace switch with improved type (coloured black). Use old part no, Philips will supply a new type | 14-09-04 |
| Philips | GFL2.20E 29PT828C | dead | R3528 39k o/c | 14-09-04 |
| Philips | GFL2.20E 29PT828C | dead, green LED flashing | R3148 120k gone high (large signal panel) | 14-09-04 |
| Philips | GFL2.20E 29PT828C | dead, LED flashing | Frame IC TDA8177 and C2260 100uF 63V | 14-09-04 |
| Philips | GFL2.20E 29PT828C | no sound from front speakers in dolby or surround modes | go to install menu, then TV config menu and set "external amp" to off | 14-09-04 |
| Philips | GFL2.20E 29PT828C | quiet buzz from centre speaker when playing back VCR via SCART | unclip 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 |
| Philips | GFL2.20E 29PT828C | set trips from green LED to red, then back green to red | IC 7540/7550 TDA2616Q on audio PCB | 14-09-04 |
| Philips | GFL2.20E 29PT828C | sound int. goes low and distorted, rear speakers crackling | resolder earth links on component side of dolby module | 14-09-04 |