Factory reset the TV.
Home button 5 times
Fast forward button 3 times
Rewind button twice
If that doesn't work settings > system > advanced system settings > factory reset
Try unplugging the tv and plugging back in that worked for me
Try unplugging your tv and plugging back in. That worked for me. I have an Xbox s and ps5 it did the same thing on a Hisense Roku tv
Restarting Roku tv worked perfectly. Both XBox consoles stopped working today. Worked yesterday.
Thank you for sharing your post in the Roku Community!
We appreciate you for contacting us about connecting a game console to your Roku TV. We're here to help you with this process and ensure you have a great gaming experience!
If you are setting up a game console on your Roku TV, you can use Automatic Game Console Configuration to achieve optimal gameplay settings with little effort. In addition to supported features being configured automatically, the appearance of the generic input tile you see on your Home screen will be modified with a name and image that matches your game console, making it obvious where to go when you want to play video games.
Are you using the HDMI ARC port on your TV? - If so, check the TV settings and make sure ARC and related features are enabled.
If you are experiencing an issue with a Roku-branded TV (Roku TV Select or Roku TV Plus), feel free to contact Roku Support.
If you're encountering an issue with your Roku TV manufactured by a Roku partner, start by contacting the manufacturer. Each TV manufacturer provides direct support for its models.
For support regarding Roku TVs, please visit our support page: Where can I get support for my Roku TV™?
Have any other questions? Don't hesitate to let us know.
cheers,
Arjiemar
FIXED - We just had same issue. We've been using the Nintendo Switch on this Roku TV for years now - was working fine last night, today it says no signal - is it on? It clearly is on. Spent over an hour trying different hdmi cables, swapping ports around, turning off and back on, unplugging everything. What finally worked was updating the Switch itself. System Settings > System > System Update. (You'll need to be connected to internet for it to update). Someone else said that they fixed it by updating their Roku TV. One other thing to note - after moving the hdmi to another port, the TV now shows 2 different Switch icons on the home screen. After you update, make sure you try both if you have this - for us one of them works but one of them doesn't. I'm scared to unplug it to change back to the original port now that I finally got it working 🤣.
Hope this helps!!!