Question about Sony KV-27V42 27" TV

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No sound coming out of the internal speakers

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.

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  • camellion Apr 19, 2008

    Interestingly, the "audio out" jack is working and I can even change the volume on the ext amp'd speakers with my remote. I also measured the AudioVCC to be 14.5V which means the power distribution is ok. According to the schematic, the same audio signal going into the audio out jack is tapped in the audio amp IC401 before it goes to the baffle speakers. I measured 14.3 on pin 4 and under a volt on the other pins (except for NC and GND pins). Could this be the problem? I'm curious how this part could go bad. I'm ordering the TDA7057. I'm always suspicious about ICs that are on heatsinks.

  • camellion Apr 21, 2008

    Does anyone have the service manual for the kv24V42? I realized I've been working on the "S" version kv24S42 and some of the ICs are different/missing. I started tracing the audio signal on the A/V switch (IC203) and the IC pkg is different between the models. The audio amp (IC401) seem to be ok since I'm getting the right voltages on the pins.

    Many thanks to those that have helped so far!



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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.

Jerry G.

Posted on Apr 17, 2008

  • Jerry Greenberg
    Jerry Greenberg Apr 19, 2008

    If the set has an earphone jack, check to see if the jack is working properly, and not defective. Some earphone jacks cut the speakers when the plug is inserted. I have had defective earphone jacks cause loss of sound.

    You can also look for cold solder connections on the circuit board.

    Your only way to find the audio is to trace the audio path with a scope and see where it is stopping. This is what is normaly done to find where the audio is stopping.

    You could shotgun it and replace the audio output IC as a first try, and then start replacing parts all the way back to the audio demodulator area. This is not a feasible way to service a set.

    If you have sound out the phono connectors on the rear of the set, audio out from the earphone jack (if present), and no audio out from the speakers, this is usualy one of the easiest types of problems to find in a TV set.

    Jerry G.



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