My Isata 3 TV's, front TV set to HDMI 1 rear TV coaxial connection set to component/AV. Playing DVD in Jensen radio I could not turn off front TV while watching rear TV in bed. Turning off front TV via remote or power button DVD player would turn off. Installed switch plug between outlet and front TV power cable.
Now I turn on both TV's and switch off
Switch plug and front TV turns off.
Front speakers and rear TV has sound and picture while playing DVD.
Removed left and right screw on each side of the front TV on metal bracket to tilt front TV forward to insert switch plug into outlet.
Maybe there is an other solution but this works for us.