Question about Toshiba 42AV500U 42 in. LCD HDTV

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My 42AV500U LCD TV acts like a ghost is pushing the volume-down button! When this happens, I push volume-up on the remote, and the volume bar goes up and down like it's competing, but volume go all the way down if I let go. This happens about 10% of the time I use the TV. It seems to happen more often in humid summer weather (yeah, sounds crazy), but that's the only flaky connection I can see. What's puzzling is that it usually happens after the TV has been on a while and is warm, but can happen from the start or after an hour, so it's not a temperature problem. Sometimes, the problem is infrequent and sometimes it's pretty agressive and I can't get the volume to stay above zero. There's a bit more: I use an antenna, and I can use the menu's add/delete channels feature to skip some channels when I surf channels up and down. What's goofy is that some of them will not "stay" turned off, like 5-2 and 7-2, but other subchannels will stay off. So, after I pass the channels once or twice, they reappear as being turned on. Lastly, and this happens rarely, I turn the TV on and the LED power indicator lights up and I hear TV sound, but the screen's backlights don't come on. I turn the set off and on again and all is well. I took the back off the TV and blew out everything with clean compressed air, including the control buttons on the side of the TV while bouncing them to make sure they are clean and free (they are). No improvement. Does anyone have a suggestion as to what may be the cause? I didn't find a software update for the TV.

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4 Suggested Answers

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SOURCE: My TV has sound but No image!!!

a 42hp66 is a plasma set,, the y-sus or the z-sus circuit board has probably gone bad.. as these are expensive parts you might want to have a technician determine which one of the two is bad before ordering both of them

Posted on Nov 28, 2007

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tvservice306
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SOURCE: Toshiba 42HP66 No Picture, Only Power Works

try replaced z board Manufacturer Toshiba Part Number 75003032 Description ZSUS PCB ASSY

Posted on Oct 02, 2009

  • 668 Answers

SOURCE: The volume goes up automatically, then after a few

Most of the time it is the touch button assembly on the tv. The Volume down touch button switch is sticking.
I hope this helps,
Skyassoc

Posted on Dec 08, 2010

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