I just bought a brand new Onn Roku TV with red letters on the screen that won't go away.
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Thank you for contacting us about the problem you're experiencing with your Onn Roku TV. The letter "R1" appears to be stuck on the screen. We're pleased to assist.
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Cheers,
Arjiemar
Can you post a screenshot here. (use the little camera icon above and upload a photo).
Does it look like the one posted in this thread https://community.roku.com/t5/Discussions/Red-symbols-stuck-on-display/td-p/994326