I am willing to have another look at the PCB if I can help you guys with it. I am in your place very often (we have all the schools in your place as our customer (fire-alarms)) so I can give you a call when I'm in the area. Maybe I could pick it up at your work ? (Easier than the center of your place

).
Does it still only show one quarter of the screen with letters ?
It used to be half of the screen before the replacing of the RAM, so it could be that I put another bad RAM in there or maybe another RAM is acting up. I've got more spare RAMs here. By piggy-backing (temporarily) it's often possible to find the bad RAM.