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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Couple of dogs!
JVC AV-32FA44: Goes dead, just as you get a perfect picture. Talked to
JVC Tech, he said it's the over voltage feedback loop, but I can't find anything bad after doing the following repair. If I bypass the standby relay, the unit works fine but of course, no front panel function. Ideas? D 432 SHORTED,Q431 OPEN,C973 BLOWN APART,THESE ARE PART OF OCP SHUTDOWN CIRCUIT,HAD 4.04 VOLTS ON OCP LINE, SHOULD BE LOW,PUMP UP OUT OF VERTICAL IC PIN 7 SHOULD KEEP Q431 TURNED ON Sony KV-32S40 dead, with MX0841B reg IC, 0.1 ohm fusible, 2SC5148 horizontal output bad, I didn't have a VDR 602, & it measured ok...open circuit. Put it on the variac, slowly ramping up the voltage, perfect pix, & sound....few seconds later...gently blew all parts. They idn't even get hot. Flyback bad? Didn't get time to scope the horizontal waveform. Did I miss something? JVC AV-32720 shorted D 531, replace, blows right away. Can't get to measure anything. Ideas? |
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