Question about Sony KV-27V42 27" TV
My set originally died with 4 blinks. I replaced the Q501 (2SC5426) and my TV now turns on (no more blinks) but now there's no sound coming out of the speakers. I have the L and R wires connected to the board and I know I'm sending audio because I can hear the sound when I connect external speakers on the "Audio Out" jack. I'm suspecting the IC401 that's on a heatsink. I will measure the Vp to make sure I'm powering the IC.
Is there more to the orginal blinking problem that possibly blew something else? Thanks.
I have sound but no pic. and the standby light keeps blinking
Posted on Dec 26, 2009
I myself do not have a copy of the service manual to see the transistor that you replaced.
I would use a scope and trace the audio path to see where it is stopping. It is possible that the output IC is damaged, but this is rare. It is very possible that part of the distribution from the power supply is also not working. There may be a series resistor or fuse resistor that is opened somewhere if the voltage is missing. If you replace a series resistor that is opened, before turning on the power find out where the short is that caused the damage in the first place.
Turning on the power after replacing parts, and not verifying and fixing the the cause of the failure will usualy lead to the same parts failing again.
Posted on Apr 17, 2008
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