Hi @Indianajones,
Welcome to the Roku Community!
Thanks for letting us know about the trouble you've encountered with your ONN Roku TV. We suggest unplugging and replugging your Roku TV with the soundbar in this case.
Also, we recommend restarting your Roku device from the Settings menu by navigating to Settings > System > Power > System restart (if you do not see a Power submenu, skip to the next step).
Please keep us posted on what you find out, and we'll continue assisting you from there.
All the best,
Chel
Jecheal R.
Roku Community Moderator