Try setting the Display type on your Express to the display resolution of your TV, rather than "Auto detect".
From the Roku home screen go to Settings > Display type.
When you change the Display type to a new setting it runs you through several screens:
• A screen that lists the display options supported by that Roku device and allows you to choose one. It will warn you if your TV has not indicated it supports your choice but will still allow you to try it.
• A screen with a picture, with two options below it: "No, there's a problem" and "Yes I see it". The "No" option is highlighted by default. To keep the screen setting you're currently trying, you have about 15 seconds before the page times out to arrow over to the "Yes" option and click on it.
If your screen just goes black and stays that way, or if your TV displays a "No Signal" or similar warning, in about 15 seconds it should return to the previous menu. If it doesn't, press the Back Arrow button on your remote to return to the menu you could see.
Roku Community Streaming Expert
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
