You can try to reset it. Turn the TV off and unplug it, hold the power button down for 60 seconds then plug it back in continue holding the power button down for 60 more seconds then attempt to turn it on. If this doesn't help then you either have a faulty power or Logic board, there is no way to really tell you which is bad as they both can give you the same issues when they go south. The majority of the time it's the power board "80%" but that isn't always the case. You will need to open the TV up anyway to record the boards model number so take the time to physically examine it for any possible bad Capacitors.