I cannot get roku ultra to work on samsung S95D smart tv. Gives Check device power every time app or HDMI source is selected.
I have tried: disconnecting both Power and HDMI cables. Switching HDMI ports. On Samsung TV - HDMI cable test (passed), and used connection guide on tv. I can see the roku when using HDMI guide (troubleshooting) on the tv, but then I get your device is now setup, then the tv recognizes that it's a ROKU and changes from manual source input to "Roku input" and simultaneously the roku powers off and the tv says check device power.