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TCL 4k TV is dimming to a low brightness

It is a rather old TV now, but the TV will often go to a very low brightness for a second or two and then go back to normal. This is very annoying, especially for online games. Is my TV now broken or can this be fixed?

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Re: TCL 4k TV is dimming to a low brightness

You would be better off contacting TCL.  Roku doesn't make the TVs.

Where can I get support for my Roku TV™? | Official Roku Support

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