Tv worked fine until it just started powering itself off. Originally you could just turn it back on and it would be fine..for awhile. Started doing it a lot more and now I am only able to power TV on..it shows a blue screen with 'HDTV' in corner another screen stating no input signal (FYI I have no cable or components connected to tv) and then it suddenly powers off and red power light just blinks consistently non stop. Only way to turn tv on again is to unplug it and plug it back in, but of course it does the same thing again. Replaced Power Board but alas it didn't fix problem. Any thoughts on the next board to try to replace?