Well I googled it and there are many mentions of power supply problems.
Thoroughly inspect the power supply for bulging capacitors etc.
Without looking at it myself this is about all the info I can give you.
If it does have bulging capacitors or some other problem with the PSU it might be on its own board that you may be able to purchase a replacement power board. But if the price of the board is half as much as the TV you might as well buy a new TV.
2600k HT on@4705mhz 8gb Cas9 1600 mem 2x EVGA GTX770 4gb Classified cards in SLI @1320 mhz core and 2003 mhz mem,mounted in CM HAF922 with a TX-850 PSU 2xHTPC's 2xi3 2120 3.3ghz dual core,1xasus LP HD6570 1xHIS hd7750@1150core1325mem,55"PanyVT30