| Make | Model | Problem | Solution | Date |
| | | |
| Found: 4551
|
| Philips | GR2.1 | Picture disappears, no sound | Flat cable to horizontal deflection coil is too close to RGB flat cable to picture tube base board. | 14-09-04 |
| Philips | GR2.1 | Picture mutes every 6 sec., in sets with memory protection panels | Remove C2721.
| 14-09-04 |
| Philips | GR2.1 | Protection circuit working from time to time | Diode 6592 (LL2C30; 4822 130 80928) leaks. Voltage to protection circuit was ca. 400 mV, it should be 28...23 mV. | 14-09-04 |
| Philips | GR2.1 | Revised picture tube drive adjustments in service | Revised picture tube drive adjustments in service manual GR2.1. The electrical adjustments 1.13, 1.14 and 1.15 on page 7.1 of the GR2.1 chassis service manual 4822 727 18334 have been revised as follows:
1.13 White balance
Put the TV into the service | 14-09-04 |
| Philips | GR2.1 | Service manual corrections | Service manual corrections The parts lists of GR2 service manuals should be corrected as follows:
Service manual for 21ST2731/05B 4822 727 19403
Add control panel code no. 4822 432 10957
Service manual for 25ST1750/25B 4822 727 19042
Item | 14-09-04 |
| Philips | GR2.1 | Set can only be operated with Remote Control | Check whether "Child Lock" is disabled. To check this, see "Frequently Asked Questions", "How to disable Child Lock". | 14-09-04 |
| Philips | GR2.1 | Set does not start up from standby | The following change has been introduced in production :
Position Old New Code no.
R3663 4K7 5K6 4822 051 10562
R3674 1K1 1K 4822 050 11002
D66 | 14-09-04 |
| Philips | GR2.1 | Set is humming. | Hum is caused be a bended coil 5605 touching the SOPS heatsink.
Bend the coil to avoid touching of the heatsink. | 14-09-04 |
| Philips | GR2.1 | Sound mute on cable networks and with some VCRs. | Remove R3064 on stereo IF module, replace R3065 by 4K7 (4822 051 10472).
Add on R3070 8K2 (4822 051 10822). | 14-09-04 |
| Philips | GR2.1 | Sound rattle when white pattern and on some cable networks. | Replace coil 5035 on the IF module by 4822 157 63077. Realign S5035 to have a good picture and sound. | 14-09-04 |
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| Philips | GR2.1 | Spot on screen when switching off, possibly burnt in CRT | Replace C2450 by 100 uF (4822 124 80059) on the chassis.
Replace on CRT-panel C2433 by 680 pF (4822 126 12269).
Desolder R3432 on the CRT-panel and make a shortcircuit on this position.
Remove jumper between C2432 and T7345, solder R3432 between collec | 14-09-04 |
| Philips | GR2.1 | Survey of codenumbers CRT GR2.1, GR2.2 AA/AB. | Survey of codenumbers CRT GR2.1, GR2.2 AA/AB. For your info the code numbers of the CRT. This info can be used to complete your SI 92.02. (4822 727 19535).
A51 EAM 31X45 21" mini neck 4822 131 20324
A51 EAL 55X73 21" narrow neck 4822 131 20483
A59 | 14-09-04 |
| 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. | 14-09-04 |
| Philips | GR2.1 | Thyristor TH6670 (SROR5043) warms too much | Change the value of R3663 to 5k6 (4822 051 10688).
| 14-09-04 |
| 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. | 14-09-04 |
| Philips | GR2.1 | When replacing micro - remote won't work | Reqs 6Mhz Xtal instead of older 4.1Mhz | 14-09-04 |
| 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 | 14-09-04 |
| 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).
| 14-09-04 |
| 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. | 14-09-04 |
| Philips | GR2.1 25ST1724 | Txt absent producing F7 on screen when selected | IC7800 micro on Txt pcb =- type PCF84C81/A89 - ensure correct type fitted | 14-09-04 |
| Philips | GR2.1 25ST1750/05B | Width excessive with no control | R3585 15R near LOPTx o/c | 14-09-04 |
| 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) | 14-09-04 |
| Philips | GR2.1, 2.2 AA | no picture or sound | fault in PROT circuit , can be zener diode 6666 | 14-09-04 |
| Philips | GR2.1, 2.2 AA | PROT disable | Dis Pin 8 IC 7600 | 14-09-04 |
| Philips | GR2.1AA | DEAD WITH POWER SUPP. RUNNING | CHECK IC7880 PCA84C81AP/098 ( UNPLUG TEXT PCB TO PROVE ) | 14-09-04 |
| Philips | GR2.1AA | EHT BUT NO SOUND OR PIC AND A FLASHING LED ( WHEN | TDA2579B PRODUCING WRONG S.CASTLE PULSES | 14-09-04 |
| Philips | GR2.1AB | Dead | C2545 1500pf 2kv s/c connected to BU508AF LOPTr | 14-09-04 |
| Philips | GR2.1AB | Raster present with green LED flashing | HT was low when connected to LOP but ok on bulb - Audio o/p chip was s/c | 14-09-04 |
| Philips | GR2.1AB | Thump from spkr then trips | Dis'd TDA2613 audio o/p chip brought back pic but replacement along with R3241 8R2 failed to cure; soft start cct faulty - T7247 BC848 s/c | 14-09-04 |
| Philips | GR2.2 | "S" in screen, cannot go from service mode. | Diode 6705 (BZV55-F5V1; 4822 130 80905) leaks. | 14-09-04 |