| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Philips | GR2.1AB | Dead | C2545 1500pf 2kv s/c connected to BU508AF LOPTr | ||
| Philips | GR2.1AA | EHT BUT NO SOUND OR PIC AND A FLASHING LED ( WHEN | TDA2579B PRODUCING WRONG S.CASTLE PULSES | ||
| Philips | GR2.1AA | DEAD WITH POWER SUPP. RUNNING | CHECK IC7880 PCA84C81AP/098 ( UNPLUG TEXT PCB TO PROVE ) | ||
| Philips | GR2.1, 2.2 AA | PROT disable | Dis Pin 8 IC 7600 | ||
| Philips | GR2.1, 2.2 AA | no picture or sound | fault in PROT circuit , can be zener diode 6666 | ||
| Philips | GR2.1 25ST1761 | Repeadly tripping | PSU Works ok on dummy load; 1534 315mA Wickman fuse (O/C), R3545 100ohm (O/C), C2559 100uF 25v (leaking electrolyte), R3585 15ohm (O/C) | ||
| Philips | GR2.1 25ST1750/05B | Width excessive with no control | R3585 15R near LOPTx o/c | ||
| Philips | GR2.1 25ST1724 | Txt absent producing F7 on screen when selected | IC7800 micro on Txt pcb =- type PCF84C81/A89 - ensure correct type fitted | ||
| Philips | GR2.1 | You cannot change all options in the service mode at the same time. | If you save all changed options by selecting stand by it can happen in sets with MR5 software that some values are not stored. To avoid this, store each option group separately. | ||
| Philips | GR2.1 | White stripes in picture in 25" and 28" sets | Change value of R3501 from 75 Ohm into 100 Ohm (4822 051 10101). | ||
| Philips | GR2.1 | Whistling LOT. Discharge is audible. Loudness depends on picture. | As a result line output transistor becomes defective. Break earth pin A. This pin connects ferrite core to earth via spring. Cut as close to the plastic holder as possible. This pin is not in the Service Manual. REMARKS : From week 9223 onwards transf | ||
| Philips | GR2.1 | When replacing micro - remote won't work | Reqs 6Mhz Xtal instead of older 4.1Mhz | ||
| Philips | GR2.1 | Totally dead. | Check and replace R3624 and R3625 in the power supply. Codenumbers: R3624 330 kOhm 4822 053 10334, R3625 560 kOhm 4822 053 21564. | ||
| Philips | GR2.1 | Thyristor TH6670 (SROR5043) warms too much | Change the value of R3663 to 5k6 (4822 051 10688). | ||
| Philips | GR2.1 | The NICAM option remains on. | Symptom occurs after switching NICAM on and then off and leave by stand by. To avoid that the nicam option remains on you have to change an other option at the same time. E.g. change UHF only to off and again to on then the nicam remains off after saving. |