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Sound but no picture.

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Sound but no picture.

I have a 47" LG HDTV that is driving me nuts! It can be working beautifully and then the screen goes black and I get a message on the screen "No Signal". The sound continues, however. How do I get sound if there is no signal? At any time, the picture may return without me doing anything, so I don't know why it returned, any more than I know why it left. I have had a Comcast repairman come out after I had been without a picture for 4 days and he was able to restore the picture. that was a few months ago and now the problem has returned as bad as ever. In a recent online chat with a Comcast representative, he was able to send a signal to my TV that restored the picture, but that only lasted for a few days. Can you suggest anything that will help? I would be very happy to have a repairman come out again!

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