GRUNDIG TV Repair: Common Faults and Solutions.

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GRUNDIG Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
GRUNDIG	CUC3400	Poor purity & focus.	C433 ( 1 , 000uf , 25v )
GRUNDIG	CUC3400	No start up with ticking	Ht at chopper coll - c653 4n7 connected to pin 15 power chip u/s
GRUNDIG	CUC3400	No start up - ticks	C653 4n7 connected to pin 15 of power chip u/s
GRUNDIG	CUC3400	No sound	C266 1000µ 25v s/c; r367 8r2 safety res o/c
GRUNDIG	CUC3400	No chan change when cold - display changes ok tho'	Dry joint pin 15 tuner/if socket
GRUNDIG	CUC3400	Int or perm tripping - ok on dummy load	Timing cap c653 4n7
GRUNDIG	CUC3400	Int dead	Pin 0 on lopt (eht overwind) arcing internally - new lopt reqd
GRUNDIG	CUC3400	Int colour & rh side of pic blanked	Tda2579 timebase chip
GRUNDIG	CUC3400	Dead.	Drys on main pcb.
GRUNDIG	CUC3400	Dead, 800ma si642 fuse o/c, chopper t661 but11a s/c	Check for dry joints ipsalo tfmr or d663, 664 & 666 faulty also check c667 2µ2
GRUNDIG	CUC3400	Dead with buzz from ipsalo tfmr	The +m supply ok at 11v in st/by but dropped instead of increasing to 20v when sw on. c630 0µ68 leaky
GRUNDIG	CUC3400	Dead or tripping	Set ht pot r637, d666 byv16 s/c, d664 ba159 s/c or ic686 78m05 s/c
GRUNDIG	CUC3400	Dead 800ma fuse blown	Dry joints on chopper tx check d663 664 666 c653 4n7 c667 2u2
GRUNDIG	CUC3400	Dead - repeatedly blows t661	Replace ic655 tda3640, d666 rgp30m, r637 1k preset, c661 47µ 63v, d662 zpd3v9, r661 1r & c667 0µ15 or 2µ2
GRUNDIG	CUC3400	Dead - all fuses intact	D691 byv28/100 s/c (20v supply)
GRUNDIG	CUC3400	Dead - & tripping.	Set ht control ( r637 ) int o/c , d666/d664 s/c , ic686 78m05
GRUNDIG	CUC3400	Dead	On/off sw u/s chs - g102
GRUNDIG	CUC3400	Blue raster with fb lines	Tda3505 vid proc chip ic9531 on chroma board
GRUNDIG	CUC3400	Arcing/random chan change	Triple
GRUNDIG	CUC3400	+b decreasing when average brightness of picture increases.	Change c611 47uf cap.