Do you have another tv you can try this on? If it works there, try setting Settings > Display type to the actual resolution of the first tv, not the "auto" setting. If you see a countdown screen click on the Yes button. Now try it back on the original tv.
If no other tv, try a different HDMI port if there is one.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
