Problem with factory fitted rear sony TV on X5 2002

[raj]

Hi, I have a problem with my X5's overhead rear sony TV screen, there isn't any power going to it and I don't know where to start. I've looked at all the fuses and all seem to be fine and in place. Although it is factory fitted, I cannot see any wiring diagrams or evidence pointing to any power. It has all the standard DVD and playstation inputs but cannot find out why there's no power, considering both the DVD and playstation have power. If anyone can help please let me know otherwise where can I buy a replacement screen from?

Thanks
Raj.
2002 X5 4.6i.s