Weak or almost dead power supply board. It can be changed as a DIY project. Google power supply and watch a youtube video. Really easy. Just unplug, removes ALL he screws on the back panel, unplug the 3 to 5 wire plugs from the board, remove the four screws holding it in place. Pop in the new board, replace wire plugs, install back cover. Plug into the wall and Press on button.
boards can be found on eBay, and tvpartsguy.com
look for the exact model number on the back of your tv first to match.
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