(Topic ID: 129180)

Is my DMD repairable?


By ryanwanger

4 years ago



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  • 47 posts
  • 18 Pinsiders participating
  • Latest reply 4 years ago by BLACK_ROSE
  • Topic is favorited by 6 Pinsiders

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    #6 4 years ago

    Have you tried simply re-seating the connector to the original display? It sounds like you just removed it and installed another without trying to re-seat the connector as the first step of fault finding. For a display to die like that I would immediately suspect the ribbon cable.

    Be mindful that using an outgassed display will result in added stress on the 5V section which can in turn result in game resets. An outgassed display is good to have as a spare just for a quick test but you need to think seriously about using it in your machine full time.

    Try the original display again and see if it comes good after the connector has been reseated.

    #8 4 years ago
    Quoted from Crash:

    Is it the 5V section that gets overloaded? I thought it was the HV circuit.

    Double checked the old Pinrepair guides, it is easier to quote the guides.......

    "There is no way to fix an old "outgassed" display.
    When a DMD starts to get blurry or displays gaps, the rumor is the power
    requirements for the display increases. It turns out this rumor is actually incorrect,
    at least as far as the High Voltage (-120 and +65 volts) is concerned. The HV (high
    voltage) power used by a display is directly proportional to the number of dots lit on
    the display. If a display is entirely outgassed and not lighting (even though the CPU
    is asking the display to lit), it will consume no more HV (high voltage) than a working
    display that is not lit. Kirb did some test of various displays and metered the results,
    proving this.
    But what about the 5 volt consumption? Unfortunately we did not do enough testing
    of the 5 volts to draw any conclusions. But based on reports of outgassed displays
    causing game resets (stressing the 5 volt supply), it is reasonable to think that an
    outgassed DMD does consume more 5 volt power. Another interesting fact is that
    certain DMD makes consume more 5 volt power than others. The biggest 5 volt
    power hog is Dale/Visay, consuming nearly twice what other DMD displays use."

    #10 4 years ago

    Fair enough. Might be worth having a look at the ribbon cable connector on the display itself just to rule that out.

    mskoenen's offer is a very kind and generous one but just have a good think about using an out gassing display as a permanent fix.

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