THere are two probable couses to your problem:
1. (vga wires)
you should check the vga wires. when you get something wierd like your "faded - purple"ish" color " its probably because one of your colors (Red Green Blue) or their corrisponding grounds, is loose. Did you mess with the video wires one the controller board? If you did go back and make sure you have all them soldered correctly.
A good way to test this theory is to connect your lilliput to a composit signal(since composit only uses one cable its like all or nothing.
if you still get wierd color issues when connecting to a composit signal then you might want to check your ribbon cable.
If loose, reconnect it.
If its broken then just order a replacement from armen at www.digitalww.com
!!!!Make sure you tell him which cable you need, there are TWO different Lilliput ribbon cables!!!!