hobbit

I've recently bought a 55 Ghia with the rear DVD system. I'm sure I had both screens working once, but now only the driver's side is alive. On the passenger side screen, there seems to be no backlight, but I can use the remote to power the system on and off, and control the volume and the tracks of a CD. So it looks like I'm missing the video feed to the screen? So should I be looking for a broken wire somewhere? Thanks.