I had the same issue with a 702 that I bought from mo-co-so.com , I had 2 Lilliputs plugged in with a VGA splitter and one of them would display 800x600 and the other one wouldnt, then I'd put it in 1024x768 and both worked!
So I returned it.
Now Im having issues with the 703's
http://www.mp3car.com/vbulletin/lcd-...lilliputs.html