There are prior posts claiming it's a board, connection or panel. But it can be any of those. Get repair estimates.
I have had the TV for about 4 years with no issues. Out of nowhere one vertical line showed up on the left side of the TV. I have tried changing inputs and turning it on and off and virtually anything I can thing of to reset it. No luck. It's still there. And it's very annoying to look at. Please help!

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