I have a Vizio SV420m LCD tv. Sometimes I get these white lines on the screen. Sometimes it will make the screen go black, but still have sound. And sometimes it works perfect. I've taken the back off and reattached the stand base, and check for loose components with a wood stick, but nothing changes while poking around the back while powered on. From my past experience, this usually means bad caps on power supply board. None look bulged, we all know this don't mean they're good. Most manufactures use cheap parts. Especially capacitors. Any advise, direction, or comments are welcomed and much appreciated. Thanks for your time .
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