For us to isolate the cause of the problem, please try performing the troubleshooting steps below:
The video cable is not connected properly or the cable is faulty
Check that the video cable is firmly connected to the back of your Roku player and to the HDMI or composite connector on the TV. If you have a Roku Streaming Stick, then make sure it is firmly connected to the HDMI connector on your TV.
If you can, check to see if you have a faulty cable by connecting your Roku player with a different cable.
There is a problem with the TV
If you can, try connecting the Roku player to a different input on the TV to see if the problem is with the connector on the TV.
If you can, try connecting the Roku player to a different television to see if the problem is with your Roku player or the TV.
If all else fails…
Disconnect and reconnect all cables including the power cable.
I understand that you are having an issue with the ESPN channel that giving you a yellow screen and returning to the home screen, is that correct?
As a first step, we recommend trying to remove the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings > System > System restart. Once your player starts up again, add the channel back once more.
Re: When I click on certain apps my screen turns yellow
The HDR on my Roku TV is terrible and the origin for the yellow we see. On Fox Sports trying to watch the world cup and now the super bowl, the picture was a borderline unwatchable yellow. Disabling HDR on the TV fixed it. What's disappointing is that you can't do this from normal settings, and it eventually turns back on. So HDR on Roku TVs is broken and Roku will not fix it.