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.