Ok so i finally got my PSone screen today so i have chopped up some pics for a better tut.
COMPOSITE VIDEO

VGA*

the lcd runs of 7.5v the same voltage as the psone.
You cannot find 7.5v in the xbox on its own.
you will have to provide it by either, using the existing wallwart and have a wire running into the lcd or you can buy a psone car lighter adapter and solder that to 12v.
I dont have the car adapter so i cannot comment on how big it is but from what I've read, its pretty large and wont fit.
There are car voltage regulatars that you can buy that let you various voltages and these are a little smaller and easier to fit in the xbox.
--------------FAQ------------------
Q. can you only have one display working at once ie only tv or only lcd?
A. depending on what cable you are using to connect to your tv, if its the basic 3 rca plugs then yes that will work but any other cable the lcd will not work.**
Q. are the diagrams shown for ntsc or pal?
A. afaik this will work for both signals.
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* this vga wiring diagram is untested as of yet.
** if your using the rgb scart cable it still may work together.
S-video diagram coming soon[FAO any moderator]
please can you replace this post with the first post thanks.
[/FAO any moderator]