Thanks for replying!
I have actually got the entire of the player. I've disassembled it and the boards I have are:
* The one with the power inlet (ribbon glued from that into...)
* The main board (with data and power connectors to...)
* The interface board (with ribbon cable to the display as per picture)
* The little sound card (I assume it is, it's marked TDK).
I _think_ I should be able to just get another interface board with composite in, or something but I'm a bit lost with all the different kinds...
Here's some more pics of the other bits (from above) - I'm using someone else's pics, but it's a virtually identical model.
Main board (next 3)
Video interface card