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I have a proscan 40lc45s57. We have tied all of the obvious things, but we can't get the sound to come on. Please help!

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Hi Lee,
Failed speakers is a common cause for no sound in flat panel TVs. Please check if it helps.

Posted on Apr 28, 2015

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I have a GE 46 in TV that had the same occurrence. I believe it is a sign that the amplifier is overheated or stressed. The way I fixed mine was to unplug TV and leave off for a few minutes -then plug in. I discovered this by accident when the power went off one day and the sound returned (had been using my vcr audio output plugged into my stereo for weeks!) This fix will work for weeks-sometimes months-evidently resets the circuits inside the amp somehow. Last time this happened I also removed the back of TV and blew out the dust with compressed air while it was unplugged-still have sound 4 months later without a "reset"-so I'm guessing it did help .

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