The Daily Populous Thursday April 15th, 2021 evening edition
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SnooWalruses9173 on April 15th, 2021 at 11:58 UTC »

Un plug it and plug it back in. If no, hit up the manufacturer.

whatdoings on April 15th, 2021 at 12:18 UTC »

Not gonna guarantee if you hit it again it will fix itself but we all know deep down that's the logical next step here.

Render999 on April 15th, 2021 at 13:17 UTC »

Hey I've repaired these, you might literally have a loose cable, if you take the screws off the panel and verify all the cables are connected (look up LVDS ribbon cables), you might just have a loose one. If not it's either your T-con board or your panel, assuming you've already tried to switch inputs and the issue persists. Most likely if it isn't a cable it's the panel... And then it's cheaper to buy a new TV.

Edit: As someone pointed out you need to unplug the TV before doing this... Unplug and hit the power once to discharge anything and you won't get electrocuted or shocked. Also you can lay the TV panel down on a carpet or blanket is the easiest way to work on it. TV guys have a special grounding blanket, but if you discharge the TV it will be fine !

Edit: Yes it can be the T-con board, but it's a gamble when you start replacing boards, there is a reason why repair people/stores have contracts for these. Typically you order multiple parts and see which one fixes it... A regular person would have to spend possibly $100+ and you aren't likely to be able to return the parts... If it's more then 2+ years old I would invest that to a new TV not trying to gamble on parts unfortunately.