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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
Make
Model
Problem
Solution
Date
Found: 10
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
Matsui
14V1T
CUC7303
Dead - Chopper FET s/c
HT res cap 47µ 385v o/c
14-09-04
Matsui
20V1
CUC7303
Dead
Replace T665 (MJF18004), IC630 (UC3842AN), R661 (220R) & D663 (3.6V Zener).caused by dry joint C669
14-09-04
Matsui
20V1
CUC7303
LED pulsing
D667 BA157 - read ok out of cct
14-09-04
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