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We're not sure. Images on most sources started to smear and the screen started to looked washed out. Tech came out and ordered a new main board thinking that would fix, but it didn't . He called it in as unrepairable and I ended up with a new Hisense since it was a Walmart Extended warranty so I...

I'd consider calling in to get warranty repair folks to look at it. I hear they are a bit tougher to deal with (TCL) but may be worth checking before warranty runs out. My TCL only lasted a little over a year (55" 4K 4 series)

How old is the TV?

Not 100% sure what's up but it appears others have same issue. https://www.google.com/search?client=firefox-b-1&q=tcl+horizontal+lines