I just purchase a Roku Premiere streams HD 4K HDR. Prior to this Roku I had a Roku XD-S model 2100x. I have hooked up the new one but the picture I get from Roku is too large for my TV. I have a Vizo 55 inch TV. I can't read the instructions on the Roku screen because it is so large it is out of the viewing area of my TV. Hopeful someone can tell me how to correct this. I can't seem to get anyone from Roku on the phone.
Roku players do not have screen size adjustments. But to my knowledge, all modern TVs do. There might be a button on the TV remote labeled picture size, or aspect ratio, or it might be somewhere in an on-screen menu. But you should be able to get the image size set correctly with such a menu.
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During the HDMI "handshake" in which the Roku and TV exchange information about capabilities, the Roku is interpreting feedback from the TV as saying the TV supports a resolution (4K maybe) that the TV doesn't actually support. So after the startup when a program tells the Roku to switche its output to that unsupported resolution the TV can't display it.
I'd suggest trying the Roku on a different TV if available, especially if it has a working Roku. If it comes up okay there, go into Settings > Display type and change the Roku to the actual resolution of the problem TV instead of the "auto" setting. When you get to the countdown screen click on the "yes" option. Now move the Roku back to the first set and see if it works.
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