You can try a factory reset, but honestly I'd be surprised if it helped.
How do I factory reset my Roku® streaming device? | Official Roku Support
That appears to be an Element TV. You could try replacing various parts within the TV, but it would be a **bleep** shoot and if there's any chance that the screen itself is damaged then there's no sense in even trying. Search for problems with Element TVs. The fact that it's a "Roku TV" doesn't really matter.
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