This appears to be a hardware issue with your Roku TV. Please contact your TV’s manufacturer directly to report this issue and request additional support. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
ALL ROKU TVs: Black Screen or Flickering Black Screen? FIXED! (2 Solutions)
Right side of the screen goes dim
Ive owned my 65″ TCL Roku TV for 5 years. A few months ago I noticed the right side of the screen was a little darker than the left but still very watchable. Fast forward to today and the entire right side of the screen is almost too dark to see. Ive done all the things people suggest but nothing has fixed it. Heres the rub… when the TV first comes on the TCL Roku splash screen is fine… full brightness all around. It isnt until the Home screen displays that the right side goes dim. Also… on occasion the problem changes from right side dim, to middle dim, and even at times left side dim… and then on rare occasions the problem goes away entirely and the full screen has normal brightness.
Dont let the occasional variations mislead you though… 98% of the time the right of the screen is too dark to see.
Re: Right side of the screen goes dim
This sounds like a hardware issue. Have you tried contacting TCL support yet to inquire further? Id suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support for their products running the Roku OS. You can reach them here: https://support.tclusa.com/televisions or at 1-877-300-8837.