I just bought the tv from sears and the picture keeps going out your watching then blank screen if you tap the side of the tv it flashes back on then eventualy goes off again
I've fixed one of these.If it is new and under warranty, call for service .You have bad connections on the main pc board and without experience and proper tools you should get qualifed help.I do this for a living.Difficulty is a 5.on a scale of 1 to 6.
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Try fixfault.com to fix televisions.