GRUNDIG TV Repair: Common Faults and Solutions.


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Search: GRUNDIG
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GRUNDIG Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
GRUNDIGCUC7303
Won't go fully into st/by - crt heaters stay lit etcPin 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
GRUNDIGCUC7303
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
GRUNDIGCUC7303
Off burning smellBad joints mains sw
GRUNDIGCUC7303
Led blinks at 1 hz rate,no start-upChange d667 (ba 157) even if it reads ok!!.
GRUNDIGCUC7303
Dead with mains fuse o/cDegauss positor
GRUNDIGCUC7303
Dead apart from led flashingSw mode trnfmr o/c winding between pins 5 & 7 (was able to repair)
GRUNDIGCUC7303
Dead - psu blownChopper tfmr, s2055 loptr & fop chip
GRUNDIGCUC7301/3
Dead - psu blownCaused by dry joint c669 - repair kits available from seme or chs also check c626 47u 385v for o/c
GRUNDIGCUC7301
Dead aft few mins - line drive lostBuffer ct169 bc858b sm tr faulty
GRUNDIGCUC7301
Vert 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)
GRUNDIGCUC7301
Tripping with front led flashingNo ht on dummy load - ht preset r654 470r o/c
GRUNDIGCUC7301
St/by onlyC667 100µ 35v
GRUNDIGCUC7301
Sound 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?
GRUNDIGCUC7301
Reduced width and line tearing when tv gets hot.Replace surface mount transistor ct169 bc858b
GRUNDIGCUC7301
Psu rebuildCheck mains smoother c626 47µ 385v or psu may need rebuilding again
GRUNDIGCUC7301
Poor regulation of psuSm diodes cd 654 and cd656 leaky. they are type ls4148 but standard 1n4148 ,s work ok.
GRUNDIGCUC7301
Pic pulled across to rightCt169 bc858b sm leaky
GRUNDIGCUC7301
Pic goes bright & may tripCt181 bc858b & ct186 bc848b sm on main pcb
GRUNDIGCUC7301
Off 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 5w
GRUNDIGCUC7301
Off chopper tr s/c c-bT665 mje18004c, d664, 666 1n4003, cd654,cd656 ls4148, ic630 uc3842a, d663 6.3v zener, r661 220r replaced & dry joint c669