try to run the internal display tests in the software first, it tests ram and more. Also check the power output from the controller board [usually dim display not garbled though]
I would try a new ram on the controller board if all the power is good and all cables are known to be good and making good connection. Seen bad ram cause all kinds of strange stuff in displays. And its a cheap easy part to replace.
Not a fan of transferring boards to other games as it can cause the problem to damage something on the other game.
be nice if you or a friend had a known good dmd with a line or 2 out to test with. Happy to lend one but you are sooo far away from me.
Should be a pin sider closer who can oblige
Cleveland, OH
