GRUNDIG TV Repair: Common Faults and Solutions.

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GRUNDIG Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem	By
GRUNDIG	CHASSIS CUC5310	Flickering in the image, light variations.	The capacitor c681 4.7mf 350v, disabled, this component is inserted in the +c 200v voltage circuit.
GRUNDIG	CUC6300	At startup it generates mat but within 1s it returns to stby, leaving no +b` (output from the ic676 lm317) and no line signal.	Replace trc. it was shorted.
GRUNDIG	CUC4400	Power supply does not generate voltages	C661 and c662 with low capacity. to replace.
GRUNDIG	MW70-2700 16X9	Doesn't work.	Cause r 220k which is part of a set. of series parallel resistances in sec. from open power supply, which causes the t60006 irfpc50 to short out
GRUNDIG	CUC4400	T644 systematically shorts out	C680 with leak
GRUNDIG	CUC7303	It does not start, the power supply does not generate voltages in the secondary, it only has 300v.	See r663 of 10r 1/4w in the primary, it may be interrupted.
GRUNDIG	G1000	It ticks, the power supply does not start, the secondary part of the power supply is fine!	See and replace the c111 1nf/1kv. This capacitor is connected between the collector and the ground.
GRUNDIG	T63-640A TEXT CUC6310	Tda8145 with excessive heating and the rv’s, e/w adjustment r462, 460 and 431 do not work.	L569 with shorted turns due to excessive heating caused due to a previous fault on this line. or, d566 shorted. Also check the following components: c461(100mf/35v), c412(1000mf/35v and c413(1000mf/35v). rewind l569 using new wire.	Duartes
GRUNDIG	T63-640A TEXT CUC6310	Image very cropped on the sides and half-moon.	C567(360nf) totally disabled	Duartes
GRUNDIG	ST63-640 CUC6310 CUC6310	Image very cropped on the sides and in half moon, e/w adjustment res r462,460 and 431 do not act. tda8145 with excessive heating.	Power supply of fault l569 with shorted turns, or d566 shorted, check tda8145, check c461 (100mf/35v) - c412(1000mf/35v)- c413 (1000mf/35v)	Duartes
GRUNDIG	GDR5400	Device completely inoperative, 12v v953 regulator very hot.	Regulator v953 very hot due to short circuit, the culprit was identified: capacitor c605 on the board containing the tuner with a resistance of 0Ω. sent by: mfm
GRUNDIG	GV400 / GV440	Display shows "locked" sometimes timer is blinking	Cassette loading is at fault, replace loading gear complete
GRUNDIG	M70-1690 CUC6369	Dead, si621 1.6amp blown apart	Replace si621 1.6a, si601 2.5a, d620 b380 c2000/1500 rec, t644 irfbc40 mosfet, ic631 tda4605-3, c633 100uf,25v, this was caused by dry joints on c648
GRUNDIG	8214	Poor linearity / vertical deflection problems	Check +d voltage on pin 12 of the vertical deflection module. if this voltage is less then 35v or has ripple replace c628 3300uf, 50v, also check fuse si627 t3,15a. sometimes this fuse has resistance causing a voltage drop across it
GRUNDIG	CUC3500	No sound av-mode sound ok	Replace ic2210 u2829
GRUNDIG	CUC4400	E.h.t very weird, e.h.t. transformer makes strange sound, no image	Measure pin 1 of the tda2579, if there are vertical pulses then measure pin 11 of the tda2579 for hor. pulses, if missing, or voltages are very low mv replace the ic. the ref. voltage on pin 12 will be present if the tda2579 works correctly. measure on pin 10 of the ps
GRUNDIG	CUC4400	No image from tuner. image from av input rgb is rolling over the screen no synchronisation	Check if teletext is present at the top of the screen. if this is ok replace the tda5931 normally the sound will also be missing
GRUNDIG	ST82-675/9 TOP CUC6380	Dead set, tripping	Loptx short circuit between most pins!
GRUNDIG	VS500VPS	All power is oscillating	Select 4934 on remote then 0000 key, should then clear
GRUNDIG	P55449 CUC4401	Dead but comes on when warm	Replace c633 100uf in the p.s.u