Judge Dredd letters on DMD are missing. Have replaced ribbon cables. Have repaired DMD controller and swapped with a known good one. Using a Rottendog MPU because of battery damage on original. replaced bottom connectors on MPU. Don't have an MPU DCS to swap. Can anyone help? Won't go into test, but test button works and causes sound like a muffled gunshot. First image is what displays when test button is pressed. Weird. Thank you for your help.