Panasonic CT-32HX42F Powers down by itself

Question

This TV is 3 years old. Over the course of the last few months it has periodically shut down by itself. Unplugging it from the wall for a few seconds would allow for some kind of discharge and then the TV would work fine for days.It has finally shut down completely and will not turn back on.Do you have any suggestions on where to look. Also, do you know where I can obtain schematics? www.samsphotofact.comno longer works.Thanks,Rickmmmmm