(Topic ID: 230102)

DataEast DMD Delay Problem

By shaub

4 months ago

Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 4 months ago by Scoot
  • Topic is favorited by 1 Pinsider


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    #1 4 months ago

    I'm trying to help someone in town with a problem he has been having with his Rocky and Bullwinkle machine. The DMD seems to have a delay updating the screen and will occasionally go black for 10 or 20 seconds at a time. Ive seen bad ribbon cables cause similar problems in the past but he has already replaced it.

    I know the problem isnt with the Dmd or the controller board itself as I swapped known working ones in.

    Does anyone have any ideas what I should be looking at or focusing on?

    #2 4 months ago

    Have you tried a new set of ROMs for the display? I had an R&B in which the DMD would freeze up only at the hat trick animation. It would then go blank indefinitely or eventually catch back up to the correct image.
    Just a thought.
    A new ROM chip fixed it up

    #3 4 months ago

    The display driver board could be freezing due to a low 5v power supply. Check the voltage at the connector for that board, ideally it should be 5v if not slightly higher.

    #4 4 months ago

    yes. I believe he changed the cpu and dispIay roms. in addition, i swapped a different dmd panel in its place and the problem was still there.

    #5 4 months ago

    Ya I bet it is the 5v issue. The dmd displays are real touchy if they don’t get exactly 5v. I would look at the dmd 5v power cable and try to reseat it (CN2 I believe). Do the same with the high voltage cable and all the ribbon cables for good measure.

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