hooking up tvs

so I've been having problems with my alpine TVs ( Pkg-m780) and after calling alpine they said it could be the video module, the problem I'm having with my TVs is everything is hooked up correctly but cannot get video to play on my screens my question is, is there anything I can do to make them work? Like open up the module and replace something or can I do something with these monitors to get them to revive video? Thankyou

It sound like your not using the right video out put. What kind of video source are you using. First of is there power going to the screens. Anothere thing those screens have two video out put make sure your using the right one.

There is 3three different sources to use on them, I have tried switching them to all three. The screens get power and displays a solid blue screen, they just will not get video signal, I cant figure out the reasom behind it so when I called alpine and tried to explain to them the problem, they told me it sound like the module is messed up. I bought these tvs off ebay and already had a problem with one of the tvs wires, the unit was used and i dont think I buy anything off of ebay anymore