Much of the stuff that can go wrong is already known, and thus far I haven't had too much trouble tracing signals. What's the problem/symptoms with your unit?

EDIT: Oh, is this the infamous display cable experiment unit?

Perhaps it just needs the whole display cable assembly replaced -- have you been recrimping onto the existing header on the displayboard, or did you already replace (desolder, remove, resolder new one) on the displayboard end of the cable?

Cheers