main board

My Samsung TV just reboots continuously with Samsung Logo. I tested my remote and it's fine. TV switched on and off with remote so i don't suspect it's a power board issue. I check with another working main board and it still has same issue. What could be the other reasons?? TV Model :-...

The TV is a Vizio D55U-D1. The screen will not come on, but the white LED indicator does come on. It lights up, fades, sometimes blinks, and eventually turns off. It also sometimes comes back on after a few minutes. The screen always remains blank. I have tested several things inside the TV with...