Model: ln52a650a1fxza (6 years old) * 3 years ago tv turned off and on. Samsung sent repair man to replaced capacitors. TV worked fine for 1 year * When we watched high definition movies or channels the TV would make a loud sign and turn off. We watched non HD channels for 6 months. * 3 months ago TV made load noise and shut down. Starting turning off and on by itself. Bought new power board. TV worked for 1 month but still could not play HD channels. Capacitors look good. * Yesterday I asked my wife if the TV was working fine. That day made a loud noise and turned off (sounded like a siren). When you now turn it on TV cycles on and off. Must unplug. * Capacitors look good (not blown). Do I replace the mother board, TConn Board, Whats the easy way to diagnose.
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