(Topic ID: 276406)

Dead DMD on Alvin G.


By JReedie

18 days ago



Topic Stats

  • 13 posts
  • 7 Pinsiders participating
  • Latest reply 2 days ago by arolden
  • No one calls this topic a favorite

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    #1 18 days ago

    Hi folks so recently my Mystery Castle killed it's DMD. I've swapped out the DMD itself, reseated all the connectors, fuses are all fine, everything I can think of seems fine. The DMD controller is also getting it's correct voltage so not sure what else could be the problem?

    Any ideas would he greatly appreciated as I have no idea when it comes to Alvin G. Machines lol

    #2 18 days ago

    Ribbon cable?

    #3 18 days ago

    Yep both ribbon cables tested out fine too

    #4 18 days ago

    Maybe one of the ROM chips needs to be reseated?

    #5 18 days ago

    Can you please post the voltages you measured? Tested the DMD in another game?

    2 weeks later
    #6 3 days ago
    Quoted from PinballManiac40:

    Can you please post the voltages you measured? Tested the DMD in another game?

    Okay so the DMD controllers LED is lit so it's powered up, measuring the outputs of the DMD controller at J103 I get:
    Pin 1: - 4.1v
    Pin 2: 5v
    Pin 4: 0
    Pin 5: 0
    Pin 6: 5.2v
    Pin 8: 69.9v

    So I'm presuming the problems are with pins 1 (-125v) and 2 (-113v) anyone know what could of caused this?

    #7 3 days ago

    Contact Mike Pacak, he has them in stock.

    #8 3 days ago
    Quoted from MrBally:

    Contact Mike Pacak, he has them in stock.

    Thanks but I'm looking to fix this one I have, just looking for guidance as unfamiliar with Alvin G. Games.

    #9 2 days ago
    Quoted from MrBally:

    Contact Mike Pacak, he has them in stock.

    If he ever answers you!
    Few folks I know have been trying to contact him, nothing.

    #10 2 days ago
    Quoted from JReedie:

    So I'm presuming the problems are with pins 1 (-125v) and 2 (-113v) anyone know what could of caused this?

    Yes. Faulty parts after 30 years.

    Coin op Calderon I believe can do repairs this board. I would also test the DMD in another game.

    #11 2 days ago
    Quoted from PinballManiac40:

    Yes. Faulty parts after 30 years.
    Coin op Calderon I believe can do repairs this board. I would also test the DMD in another game.

    Have already swapped out the DMD with a known working spare and that didnt work either, it's not the DMD sadly

    #12 2 days ago

    No. I am saying to move the Alvin G DMD into a different DMD game to be sure the DMD works. This is to make sure you don't have 2 issues.

    The DMD controller board is not supplying the correct voltages so no matter what DMD you put in the Alvin G game, it is not going to magically work.

    #13 2 days ago

    Either way you will need to rebuild the high voltage section of the display driver board. Have you taken it out and inspected it? Component lists are in the manual on IPDB and seem complete. The circuit seems similar to most other DMD games of the era; you may be able to use most of the parts from a WPC display controller rebuild kit.

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