This problems u have 90% it is the tv Tuner signal board,that the board,where the imcomming broadcasting signal cables plug into it.This problems also 10% could be power supply board have dying capacitors parts.That the board,where the power a/c cord plug into it.Check all over the power supply board for capacitors are bulging ups on tops or puffing up on it tops.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes boards the tv Tuner signal board or the power supply board for the replacement.
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