| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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) | ||
| Philips | G90B | No TXT; oscillator on TXT decoder does not function. | Add C2802, C2803 15pF (4822 122 32504) on the teletext module U1003. | ||
| 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. | ||
| Philips | G90B | no txt when heated | SAA5243P/E txt processor | ||
| Philips | G90B | No picture, sound OK. | CVBS line to IC7360 at 0.5 Volt, indicating no signal. Check/replace T7032 - BC848. Codenr. 4822 130 61207 | ||
| Philips | G90B | No picture, sound OK. | Y-signal on pin 25 IC7350 OK.Replace IC 7350; TDA8390/N3 (4822 209 61027) Modification: C2352 to 15 pF (4822 122 32504) R3336 to 3,3 kOhm (4822 051 10332) R3338 to 2,7 kOhm (4822 051 10272 ; remove R3313, 3340, 3341, D6336 | ||
| Philips | G90B | No pic for 1st 5 mins - crt htrs lit | C2660 680µ in 9v supply low cap | ||
| Philips | G90B | No colours | 4,43 MHz on pin 3 IC 7350 available. Replace IC 7350 TDA 8390/N3 (4822 209 61027) Modification: C 2352 to 15 pF (4822 122 32504) ; R 3336 to 3,3 kOhm (4822 051 10332) R 3338 to 2,7 kOhm (4822 051 10272) ; Remove R 3313, 3340, 334 | ||
| Philips | G90B | NICAM sound module order code | NICAM sound module order code 4822 212 23219 "normal" 4822 212 23347 "black connection lead". |