It's hard to know what systems you have. There is generally a power switch. On mine, it's on the antenna control. If you have a switch box for selecting DVD, TV etc, they often have the switch on the face of the box on the left end.
Sometimes there there's just a wall plate that has a light and button. You need to search for all of these items.
Don & Mary
2019 Newmar Dutch Star 4018
2019 Ford Raptor