My roku express keeps dimming. I checked online and I saw that you have to change brightness under tv picture in settings but roku express does not have this feature. Is there any other way to make it brighter?
Roku players don't have any display settings other than resolution and for 4K devices colorspace settings. Brightness settings are only available on the display you're using. Roku TVs would also have such settings of course.
I don't know exactly what you mean by screen dimming. The next time it dims, change your input to another device, or the TV tuner, and see if it is still dim. It's always possible your display (TV) is failing.
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For us to isolate the cause of the problem, have you tried using a different HDMI cable? How about connecting your Roku Express 4K to a different TV? We would recommend trying both then let us know if that resolves the issue you're experiencing.