Black box on screen
I had the same thing, but on a monitor. It means some pixels on your TV are heavily damaged, meaning your tv fell, or something got thrown at it or just hit it hard, or just because the box you bought it in wasn't completely sealed which damaged the device in transport.
Those pixels cannot be recovered, meaning you would have to use your warranty (if you still have it, or if it is still valid) to send this back to the company (or bringing it to the store you bought it in) to get a new one.
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