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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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Sony STR-DE345 no display after replacing Q704
Sony 5.1 A/V receiver model:STR-DE345,year:Jan 2000.No power I found
Q704=MP1620-OPY-M=Sony # 8-749-010-26=2SB1620=PNP=to be shorted base to collector (I think) and found F901=3 amp fuse to be open. Well I decided to remove Q704 and power up the unit with a 100 watt bulb in place of F901 so when I powered up the unit I noticed I noticed that the bulb lit bright for about 3 seconds then dimmed down,I did this to see if there were any other problems before I ordered Q704.Now when the new Q704 finally arrived I put it in and everything works great in the stereo except it has no display. I measured the voltages at the both front faceplate (display board) connectors and they seem to correspond to the voltages stamped on the board so my assumption is that IC103=UPD780206GF=100 pin quad SMT display driver IC is defective,I hope not. Did I burn IC103? if not anyone have any common repair tips for no display?.Thanks in advance. Sidney Dartmouth,Nova Scotia Canada |
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