This is most likely a problem with your LCD Controller Circuit Board (or TCon Board for short).
It is a common failure point with LCD TV's. You can often get a second hand replacement part on ebay for less than $100 if you are handy with a screwdriver and want to replace it yourself. However those ebay parts don't come with much of a guarantee and you probably won't get much more life out it than you did the first one.
Good luck.
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