If your TV supports CEC (some manufacturers call it different things) then you can enable "1-touch play" under Settings->System->Control other devices and pressing a button on your Roku remote may turn on the TV. Do you have the option to enable the "TV Off" shortcut under Settings->Home screen->Shortcuts? It adds a "TV Off" shortcut to the Home Screen that works with some TVs.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.
