Grundig CUC Repair Tips
Search: CUC Grundig
Results 430
Results 430
| Make | Model Ch. | Symptom | Problem Solution | Solution | By: |
|---|---|---|---|---|---|
| Grundig | M70-1690 CUC6369 | Dead, SI621 1.6amp blown apart | Replace SI621 1.6A, SI601 2.5A, D620 B380 C2000/1500 REC, T644 IRFBC40 mosfet, IC631 TDA4605-3, C633 100uF,25v, this was caused by dry joints on C648 | ||
| Grundig | CUC3500 | No sound AV-Mode sound ok | Replace IC2210 U2829 | ||
| Grundig | CUC4400 | E.H.T very weird, E.H.T. transformer makes strange sound, no image | Measure pin 1 of the TDA2579, if there are vertical pulses then measure pin 11 of the TDA2579 for hor. pulses, If missing, or voltages are very low Mv replace the IC. The ref. voltage on pin 12 will be present if the TDA2579 works correctly. Measure on pin 10 of the PS | ||
| Grundig | CUC4400 | No image from tuner. Image from AV input rgb is rolling over the screen no synchronisation | Check if teletext is present at the top of the screen. If this is ok replace the TDA5931 normally the sound will also be missing | ||
| Grundig | ST82-675/9 TOP CUC6380 | Dead set, Tripping | LOPTX short circuit between most pins! | ||
| Grundig | P55449 CUC4401 | Dead but comes on when warm | Replace C633 100uF in the p.s.u | ||
| Grundig | CUC2080 | After replacment of FBT, the set starts and reverts to standby mode immediately. If the Crt heater is fed by an external transformer i.e. 6 V. a/c, the screen will show a very weak light, except in the corners | 13V. was present on pin 11 of V. output IC TDA8350Q during the brief moment when the set tried to start. The TDA8350Q was found to be defective and was replaced. Don't forget to check +A voltage after replacing the FBT | ||
| Grundig | M70-495 CUC-3800 | Dead set | I replaced the BU546 transistor in the power supply and resoldered some paths on the PCB. An intermittent soldering path to the collector of the transistor was the reason for the destroyed BU546 | ||
| Grundig | CUC6310 | No east-west | Check R569, TDA8145, D566 | ||
| Grundig | T55-731 CUC7303 / FET TYPE | Dead bridge and chopper transistor s/c | If no D663 fitted this is version 2 has fet and UC3843. Failure of p.s components caused by C669 dry jointed. Check/change FET BUZ90, D667 BA157, R661 4.7k not 220r version 1, R666 and R667 56r 1w, R663 10r and the UC3843. All values for 20" | ||
| Grundig | M82-795 CUC7880 | Dead, 800mA fuse blown | Check for dry joints on the chopper transformer also check D663, D664, D666, C653 4.7nF and C667 2.2uF | ||
| Grundig | CUC5350 | Goes to standby after a short time | Replace C631 1uF, 63v | ||
| Grundig | T55-640 CUC 6300 | Sleep timer box on screen, remote & front buttons not working | Changed the EEPROM IC847 24C04 | ||
| Grundig | CUC5310 | Picture int disappears leaving snow on screen | Resolder the Xtal in the tuner | ||
| Grundig | M70-490/9 TEXT CUC3800 | No sound, picture ok | When shifting up the channel frequency using the fine tuning, a very weak sound could be heard. Replaced the sound IF demodulator chip U2829BIC2110 | ||
| Grundig | CUC5310 | Dead, no shorts found | Look for dry joints on the scan coil plug may not be visable also resolder the 12v and 5v regs | ||
| Grundig | ST70-460 CUC4635 | Intermittent start up and tripping | Dry joint on R636, vertically mounted 4.7 ohm wirewound in sw mode circuit | ||
| Grundig | CUC7301/3 | Power supply blown | This is often caused by a dry joint at C669 in the snubber network but also check the mains bridge rectifiers reservoir capacitor 47uF, 385v for o/c, this item is not included in the ususal p.s.u repair kits and if not checked may result in a repeat blow up ! | ||
| Grundig | CUC7350 | Dead - mains fuse shattered | D60013/4 mains rects s/c, chopper FET T60020 IRFBC40 s/c used BUZ90 UC3843 replaced as prec,caused by dry joints chopper tfmr | ||
| Grundig | CUC7350 | Dead - +8v supply absent | R61021 15R safety res in 8v reg o/c |