My TV model PV-DF2735 was fine.Then,for no apparent reason, it shut off. I turned it on, screen was pink& hazy, but still played both picture &sound, within 30 secs it turned off. I tried again with same result. disconnected all devices & unplugged the unit,waited 30 min & worked fine 1 hr & shut off. I followed same process as before, leaving it unplugged 48hrs before reconnecting everything. It powered on & worked 3 months then did it again. I tried just as before, but it didn't correct the problem. HELP