Yep, even if you find one (which, as Bill said, you won't) it won't help you much.
What exactly is wrong with it? These things rarely fail electronically..its almost always a mechanical fault, or a cracked LCD (possibly broken LCD connector).
Your best bet is to carefully open it up and give it a look. I managed to fix my sisters one as it was just the shutter mechanism that got stuck. Schematics won't help.