| Make | Model | Problem | Solution | Date |
| | | |
| Found: 534
|
| Grundig | CUC7301 | Poor regulation of psu | sm diodes cd 654 and cd656 leaky. They are type
LS4148 but standard 1N4148 ,s work ok. | 14-09-04 |
| Grundig | CUC7301 | PSU rebuild | Check mains smoother C626 47µ 385v or PSU may need rebuilding again | 14-09-04 |
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| Grundig | CUC7301 | Reduced width and line tearing when TV gets hot. | Replace surface mount transistor CT169 BC858B | 14-09-04 |
| Grundig | CUC7301 | Sound only - burst of line at sw on only | Line osc at base of Line dr tr - nothing at collector. CT169 line osc buffer BC858B sm faulty. Note - HT is 105v when set working but rises to 129v in st/by or when non operational - normal? | 14-09-04 |
| Grundig | CUC7301 | St/by only | C667 100µ 35v | 14-09-04 |
| Grundig | CUC7301 | Tripping with front led flashing | No HT on dummy load - HT preset R654 470R o/c | 14-09-04 |
| Grundig | CUC7301 | Vert cogging, line speed int decreases with narrow pic & overheating LOPTr | CT169 BC858B sm pre-driver tr (2" back from jungle chip - LOPTx side of scart skt) | 14-09-04 |
| Grundig | CUC7301 | Dead aft few mins - line drive lost | Buffer CT169 BC858B sm tr faulty | 14-09-04 |
| Grundig | CUC7301/3 | Dead - PSU blown | Caused by dry joint C669 - repair kits available from SEME or CHS also check C626 47u 385v for o/c | 14-09-04 |
| Grundig | CUC7301/3 | Dead after dry joint C669 caused havoc | T665 MJF18004C chopper s/c; IC630 µC3842N/AN; D621-4 1N4007; R661 220R; D663 3v6 zener; CD651 ZD18v; D667 BA157 leaky. | 14-09-04 |
| Grundig | CUC7301/3 | Mains fuse S1600 2.5A blows int | 1N4007 mains rect diode, also check IC630, T665chopper tr, zener D663, R661220R,Caps C661/663/656 & 667 | 14-09-04 |
| Grundig | CUC7303 | Dead - PSU blown | Chopper tfmr, S2055 LOPTr & FOP chip | 14-09-04 |
| Grundig | CUC7303 | Dead apart from LED flashing | Sw mode trnfmr o/c winding between pins 5 & 7 (was able to repair) | 14-09-04 |
| Grundig | CUC7303 | Dead with mains fuse o/c | Degauss positor | 14-09-04 |
| Grundig | CUC7303 | Led blinks at 1 Hz rate,no start-up | Change D667 (BA 157) even if it reads ok!!. | 14-09-04 |
| Grundig | CUC7303 | off burning smell | bad joints mains sw | 14-09-04 |
| Grundig | CUC7303 | St/by LED blinks (tripping) | D667 BA157 -use BA159 in lieu, UC3842 supply rect (measured ok) also check 0R82 res in emitter, 2 x 1N4004 & res 220R & sm LS4148 diodes & HT control for o/c + chopper Tr & IC | 14-09-04 |
| Grundig | CUC7303 | Won't go fully into st/by - crt heaters stay lit etc | Pin 1 IC676 should drop to 1.2v in st/by - was staying at 10.7v. BC848 sm tr downstream from pin 1 was faulty though checked ok | 14-09-04 |
| Grundig | CUC7305 | no vid or sound | sm tr CT840 BC848B vid sw tr faulty | 14-09-04 |
| Grundig | CUC7306 | Auto tune problems | if auto tune used it defaults to wrong tv standard be aware! | 14-09-04 |
| Grundig | CUC731KT | No start up | D633 1N4935 s/c | 14-09-04 |
| Grundig | CUC7350 | "E" instead of "OK" shows when storing | Sw on with "Prog -" button depressed to clear "fault" | 14-09-04 |
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| Grundig | CUC7350 | Dead | Chopper FET & control IC partial cure but all volts low until R60027/8 0R56 1w reistors replaced | 14-09-04 |
| Grundig | CUC7350 | Dead - 2.5A fuse blackened | T60020 IRFBC40 chopper tr s/c; D60013 1N4007 mains rect s/c; C60029 dry joints; R60023 1N4003 s/c; R60027 0R56 o/c | 14-09-04 |
| Grundig | CUC7350 | Dead - Chopper FET & 2 rect diodes s/c | dry joint on C600 - blew again later due to arcing between FET & heatsink | 14-09-04 |
| Grundig | CUC7350 | Dead IRFBC40 chopper MOSFET failure | Dry joints C60029 470pf. Check R60027/28 0R46, R60022 10R, D6011-14 D60023-24 1N4007 | 14-09-04 |
| Grundig | CUC7350 | Int start up | C60031 100µ 35v in psu | 14-09-04 |
| Grundig | CUC7350 | mains fuse o/c, BUZ chopper tr s/c | dry joint C60029 470pf 1.6Kv also check D60011-14 & D60023/4 rects | 14-09-04 |
| Grundig | CUC7350 | No HT control | HT pot R60027 increased in value from 0R68 to 1R5 | 14-09-04 |
| Grundig | CUC7350 | No sound | check sm trs to left of audio IC - mute sound in st/by & when told by micro - BC848C faulty in this case | 14-09-04 |