| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 | ||
| 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 | ||
| 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. | ||
| 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). | ||
| 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. | ||
| 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 | ||
| 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". | ||
| 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 | ||
| 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 | ||
| 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. | ||
| Philips | GR2.1 | Picture mutes every 6 sec., in sets with memory protection panels | Remove C2721. | ||
| 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. | ||
| Philips | GR2.1 | No start voltage on pin 7 and 8 of IC7600 | Voltages should be 2,95V on pin 7 and 14,8V on pin 8 when starting up.Check or replace R3624 (330 kOhm) and R3625 (560 Ohm). | ||
| Philips | GR2.1 | No sound, no functions and no picture. | On firstly checking the power supply this proved to be OK. On then checking the power on reset circuit, this was identified to be fault. Replacing D6665 (4.7V Zener; 4822 130 80883) and T7663 (BC858; 4822 130 42513) restored operation. | ||
| Philips | GR2.1 | No sound when the set is warm, led blinks | Defective IC7309 (TDA4680; 4822 209 31592) blocks IIC bus. |