DMD problem

(Topic ID: 220833)

DMD problem


By United555

4 months ago



Topic Stats

  • 14 posts
  • 7 Pinsiders participating
  • Latest reply 3 months ago by United555
  • Topic is favorited by 1 Pinsider

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    #1 4 months ago

    Hi,
    Suddenly my dot matrix display is showing “lines” - and the problem follow the DMD, even if I try it in other machines. Other DMD also works fine in the machine where the problem started.
    Can this be fixed, or is it kaput?
    Brian

    8ABA04F8-175A-4B45-86E2-0E294047387A (resized).jpeg9105C851-FAD4-4B1E-992C-92F6D3E452F2 (resized).jpeg
    #2 4 months ago

    I don't know anything about repairing DMDs, but I was reading other forums/sites like https://www.pinballmedic.net/, etc and might have an idea.
    If the issue follows the DMD through multiple machines, it might be a DMD connector somewhere on the DMD itself.
    I saw a video somewhere of a guy who had a DMD which was showing a few missed dots, but still played videos/pictures. He pushed the board connector in further and the issue went away, good as new.
    Thinking along these lines, you can try and look at the DMD and see if the wires are securely connected inside the connectors themselves.

    Hopefully this helps!

    #3 4 months ago

    I will have a look at this, and maybe see if I can find some videos dealing with issues loke this.

    #4 4 months ago

    Sounds like a part failure. Can you post a picture of the back of the DMD?

    #5 4 months ago

    Yes

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    #6 4 months ago

    Is it just the pic or is c16 bulging? Cant tell on my phone

    #7 4 months ago

    I read on pinwiki that replacing a rom will fix the dmd if it has lines. I don't remember which one it is

    #8 4 months ago

    Some more pictutes...

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    #9 4 months ago

    Changing the ROM will not fix this issue.
    We need a better picture. I don't see "lines" in the display.
    --
    Chris Hibler - CARGPB #31
    http://www.ChrisHiblerPinball.com/Contact
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #10 4 months ago

    The DMD is all yellow, see first picture. (all dots is on, so to speak)

    #11 3 months ago

    Up...

    #12 3 months ago

    Hi United555

    I had a problem with my DMD a few months ago. My DMD issue was caused by a faulty computer chip.

    Link:
    https://pinside.com/pinball/forum/topic/dmd-issue-wpc-95

    I hope my post can help you to sort this issue.

    Cheers

    #13 3 months ago

    From what I read, you proved the problem follows the DMD and another DMD works in the game. That is a good start.

    Can you set your voltmeter to DC voltage and see if you can tell the resistors along the edge of the DMD on the columns and rows are pulsing? Wedge your black ground meter lead under the ground braid wire in the bottom of the backbox so you only have to worry about holding the red meter lead. I think if you measure 10 of each of the two sides, I think I would get a feel if it is a column problem or a row problem. I also would have to ask, do you have surface mount solder experience? Pretty much guarantee a problem will be a surface mount part.

    #14 3 months ago

    I am on vacation for two weeks, will see if this helps me...

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