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@4660mhz CM Nepton40XL 16gb Ram 2x EVGA GTX770 4gb Classified cards in SLI@1280mhz Stock boost on a GAP67-UD4-B3, SBlaster Z powered by TX-850 PSU 2xHTPC's Both w/i3 2120's,1xasus LP HD6570@850core 1000 ddr3mem 1xHIS hd7750@1125core1400mem