So I do now have YouTubeTV on my LG through my ROKU box. My very smart D-in-Law found a lengthy article on line and we followed that. I thought it might be of interest to others who maybe having problems.
The default power-on screen is set to “Home”. If you’re willing to go straight to Roku, on your LG TV’s home screen, tap on the gear icon on the top left. Then, within the settings, there’s another gear icon. Choose that one too, and it’ll take you to another menu. After that, navigate to “General” > “System” > “Additional Settings” > “Power on Screen”. There you’ll see the default is home; choose “Recent Input”. That’s it![/B
The complete article is very long, but if you are interest it can be found here:
LG TV With Roku: Necessary? + Complete Setup Guide | Smart Home Scope