I had a Panasonic plasma fail many years ago. Found a guy on ebay who repairs TV boards and by the symptoms was able to identify what board needed fixing. Shipped it to him, and when I got it back and reassembled the TV it was working again and still going strong in my Mom's house. Point is there are guys out there who can probably fix it.
If all else fails and have nothing to lose, I've fixed the formatter boards in HP printers by heating them in the oven to reflow the solder joints, after which they'd work fine for a year until the joints fail again. This was after they switched to no-lead solder. I forget what temperature and for how long but I'm sure Google has the answers.
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