(Topic ID: 266162)

Judge Dredd missing letters on DMD

By mermaidlover

1 year ago



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  • 6 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by Crash
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    Judge Dredd 3 (resized).JPG
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    #1 1 year ago

    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.

    Judge Dredd 1 (resized).JPGJudge Dredd 2 (resized).JPGJudge Dredd 3 (resized).JPG
    #2 1 year ago

    If you can't get into tests sounds like a CPU board connection issue, are there dip switches on that particular rottendog cpu?
    Maybe reseat the chips on the CPU too?

    #3 1 year ago

    Reseat the game roms

    #4 1 year ago

    Whoa, that's bizarre. I've never seen anything like that that. It appears the ASCII text data streaming from the CPU to the DMD controller is getting corrupted.

    #5 1 year ago

    The data from CPU to DMD controller is bitmap images, not ASCII text. Looks like DMD controller RAM addressing problem. Maybe the buffer chip in CPU board, that outputs data/address to DMD is failing.

    #6 1 year ago

    You're right, I forgot the image data is in the CPU ROM on WPC games.

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