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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 DAV-SA30 Power Supply
Hello Guys,
I have a Sony DAV-SA30 DVD surround system. It has been making a ticking noise through the speakers so I thought I'd have a look inside.. I found that the power supply module, 1-687-086-15, is supplying 34.7volts on it's 27v output. The 27v supply is high wattage to the amplifier card, it goes at follows: + from rectifier goes to the pin 1 of Q904, a 3 pin chip. Pin 2 of Q904 goes to the connector that supplies +27v to the amp. Pin 3 has a thin PCB trace going to various surface mount components presumably to control the voltage level. I am trying to locate the fault but cannot identify Q904, it is labeled PK K1189 33. What do you think is my best bet for repair? Maybe a new voltage regulator bypassing this Q904? Any ideas gratefully received! Kris. |
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