anybody know about car stereos?

hello everyone, i just bought a 90 mustang GT it has a tv type radio, radio plays ok but the screen has the logo on it, and says no video signal, and is in camera mode. when i push the mode button it does nothing. i tried reset button and it works till i turn ignition off, then back to the same thing. i cant see what station i am on,i get sound but have no idea what radio station i'm on to find a station i like. it does not have a backup camera, it's a DUAL (that's the company's name) xdvd710. I just want to get it out of camera mode so the screen says what station i'm on. is something hooked up wrong or is the problem in the head unit. Any help is greatly appreciated. thanks in advance guys.