Welcome to the forum its a great place to get your quesitons answered. need a few questions answered.
1.is this a 12V tv that plugs a transfomer into 110V
2. have you stested the red and black compartment for voltage.
If the red and black wires are 12V and the TV is 12V you will need to remove the transfomer from the power plug and splice/connect the TV power to the compartment power.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho