Grundig CUC3400 Chassis

Latest TV repair tips and faults

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id:= 014237
+B voltage decreasing when average brightness of picture increases
Change capacitor C611 (47uF)

id:= 010813
Blue raster with flyback lines
Check / replace the video processor chip IC9531 (TDA3505)

id:= 012983
Dead
On/off switch faulty (chs - G102)

id:= 010814
Dead, 800mA fuse blown
Check for dry joints on the chopper transformer also check D663, D664, D666, C653 (4.7nF) and C667 (2.2uF)

id:= 017323
Dead, 800mA fuse blown
Check for dry joints on the chopper transformer also check D663, D664, D666, C653 (4.7nF), C667 (2.2uF), and the BUT56A transistor for s/c
(Anonymous)

id:= 012984
Int dead
Pin 0 on l.o.p.t (E.H.T overwind) arcing internally (new l.o.p.t required)

id:= 012985
No sound
Check C266 (1000uF,25v) for s/c and safety resistor R367 (8.2ohms) for o/c

id:= 012986
No start up, ticks
Check C653 (4.7nF) connected to pin 15 of the power chip for failure

id:= 016352
Poor focus or picture so dim it can hardly be seen
Replace C433 (1000uF,25v) (not 16v as originally fitted) do not run set in this condition as the scan coils may overheat and crack c.r.t

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