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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair

MakeModelProblemSolutionDate
Found: 25
GrundigCUC7301Blown psu caused by R661 220R going hi resalso replaced IC630 UC3842, T665 MJFS8004, D663 3v6 Zener14-09-04
GrundigCUC7301DeadDry joint C669 blows T665 & IC63014-09-04

GrundigCUC7301DeadC669 1000pf dry joints & burnt; MJF18004 T665 s/c; ZD663 had 25R reverse resistance, D624/621 1N4007 mains rects s/c & UC3842AN faulty14-09-04
GrundigCUC7301Dead - Chopper T665 blown plus -IC630, D633 3v6 zener, D662 BA157, bridge rects D621-4 1N4007, R661 220R, R663 18R, 3 x sm diodes under psu sect, dry joints C66914-09-04
GrundigCUC7301Dead - lop tr s/c & replacement ran hotCT169 BC858B buffer sm leaky14-09-04
GrundigCUC7301Dead - R542 10k or 13k o/cWhen replaced overheated again - crack in print by lopt14-09-04
GrundigCUC7301Field lin poor, width reduced & HT only 100vR666 & 667 in psu 0R82 had risen to 1R5 (values depend on crt size)14-09-04
GrundigCUC7301Low sound & no set up menuIn hotel mode - to exit - hold down "i" button at sw on14-09-04
GrundigCUC7301low sound -stuck in hotel modehold 'i' button whilst switching tv on. Use rc arrows to select hotel mode then off14-09-04
GrundigCUC7301off chopper tr s/c c-bT665 MJE18004C, D664, 666 1N4003, CD654,CD656 LS4148, IC630 UC3842A, D663 6.3v zener, R661 220R replaced & dry joint C66914-09-04
GrundigCUC7301off with a bangC669 1000pf had dry joints causing burn up of pcb. Following parts replaced :- 2.5A fuse, IC638 uC3842AN, T665 chopper tr MJF18004C, D662 BA157 s/c, D663 ZPD3.6 3.6v zener s/c, R663 18R, R661 220R hi res, R669 5w14-09-04
GrundigCUC7301Pic goes bright & may tripCT181 BC858B & CT186 BC848B sm on main pcb14-09-04
GrundigCUC7301Pic pulled across to rightCT169 BC858B sm leaky14-09-04
GrundigCUC7301Poor regulation of psusm diodes cd 654 and cd656 leaky. They are type LS4148 but standard 1N4148 ,s work ok.14-09-04
GrundigCUC7301PSU rebuildCheck mains smoother C626 47µ 385v or PSU may need rebuilding again14-09-04
GrundigCUC7301Reduced width and line tearing when TV gets hot.Replace surface mount transistor CT169 BC858B14-09-04
GrundigCUC7301Sound only - burst of line at sw on onlyLine 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
GrundigCUC7301St/by onlyC667 100µ 35v 14-09-04
GrundigCUC7301Tripping with front led flashingNo HT on dummy load - HT preset R654 470R o/c14-09-04
GrundigCUC7301Vert cogging, line speed int decreases with narrow pic & overheating LOPTrCT169 BC858B sm pre-driver tr (2" back from jungle chip - LOPTx side of scart skt)14-09-04
GrundigCUC7301Dead aft few mins - line drive lostBuffer CT169 BC858B sm tr faulty14-09-04
GrundigCUC7301/3Dead - PSU blownCaused by dry joint C669 - repair kits available from SEME or CHS also check C626 47u 385v for o/c14-09-04

GrundigCUC7301/3Dead after dry joint C669 caused havocT665 MJF18004C chopper s/c; IC630 µC3842N/AN; D621-4 1N4007; R661 220R; D663 3v6 zener; CD651 ZD18v; D667 BA157 leaky.14-09-04
GrundigCUC7301/3Mains fuse S1600 2.5A blows int1N4007 mains rect diode, also check IC630, T665chopper tr, zener D663, R661220R,Caps C661/663/656 & 66714-09-04
Matsui20V1T CUC7301DeadDry joint C669, R661 220R burnt, 2.5A fuse blackened, also replace MJF18004 chopper Tr s/c, UC3842AN blackened, D663 3v6 zener s/c, HT preset 470R o/c HT value unknown - set at 115v for full raster14-09-04
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