philips G90B Repair Tips
Search: G90B philips
Results 47
Results 47
| Make | Model Ch. | Symptom | Problem Solution | Solution | By: |
|---|---|---|---|---|---|
| Philips | 21GR2751 G90B | Stereo set with no sound off air, maximum volume produces low hiss, some sound possible if station is detuned slightly. Sound via SCART is ok | Replace IC U2829B on audion panel | ||
| Philips | G90B | Blank screen no sound ht low | C2660 680µ16v 5v res cap | ||
| Philips | G90B | Vertical stripes on the left side. | Check capacitor C2580 (470 uF; 4822 124 40198). | ||
| Philips | G90B | TXT has too low contrast | Remove diode 6813 (BZV55-C7V5) from textdecoder unit 1996. | ||
| Philips | G90B | Txt - dist characters/excess contrast/crushed/no col | Dry joints on daughter board between main pcb & Txt/Nicam panels | ||
| 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 | ||
| Philips | G90B | Tuning unstable | Voltage on D 6004 (LLZ-C35) fixed Replace U 1000 (UV 816; 4822 210 10365) | ||
| Philips | G90B | Trips violently | Tr7652 BC858C overheating in opto coupler drive cct - Tr leaky | ||
| Philips | G90B | St/by only | EEPROM 20C02 | ||
| 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 | ||
| Philips | G90B | sound slow to come on & no txt | C2846 220µ | ||
| 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. | ||
| Philips | G90B | Slow start, led blinking in stand-by mode | TR7455 (BC858A; 5322 130 42012) interrupts from time to time. | ||
| 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 | ||
| Philips | G90B | Set blocked; no control of functions. | Check solder joints of resonator 1760. | ||
| Philips | G90B | Remote - faulty hand unit - its glued. | Remove name plate strip drill hole 1cm in from recess. | ||
| 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 | ||
| 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. | ||
| 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) | ||
| Philips | G90B | No vertical deflection | +200 V(163) not present Replace R 3570 (8,2 Ohm; 4822 052 10828) |