Hey I've searched around here and found a few threads about this but no answers.

I have a Lilliput 629GL-70NP that I had hooked up to my carputer and everything was working fine. The Mac Mini was outputing the native res of 800x480, and in the lilliput menu it showed the correct resolution - 800x480.

Well, I fried the PCB on the lilliput and they guy I talked to at Mp3car was nice enough to trade me for one he had lying around with a dead pixel. I put the old LCD on the new PCB and everything seems to be working fine ...

Except...

The menu on the lilliput now shows 640x480, and no matter what I try I can't get it to show the native resolution of 800x480. The mac mini is still outputting the correct 800x480 like before.

Is it possible I got an older model 629GL-70NP board that doesn't support the screen's native resolution? Is there any hope or do I need a new board?