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(Topic ID: 280744)

Need help with Xmen LE aux board

By Digduglus

3 years ago



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  • 8 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by Pin_Guy
  • No one calls this topic a favorite

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    #1 3 years ago
    OP
     
    MIX

    Digduglus

    Pinside member

    US Cedar Rapids, IA

    8y 67,850 378 2 49

    I opened a nib magneto LE. The wolverine magnet and switch weren't working and the left nightcrawler wouldn't go down. Eventually smoke and scorching on the aux board lower right corner.
    Emailed stern and they sent me a rev B aux board and wire harness switch. I plugged it all in, turned the game on, hit start and the board blew same place. Sparks, smoke same thing. What should In be looking for before I get ANOTHER board?
    Please and thank you

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    #2 3 years ago
     
    ABC

    Crash

    Pinside member

    13y 141K 14,139

    Can you get a close up photo of the aux boards where they both failed? Looks like one of those MOSFETs may have been shorted to ground by a bad wire harness or magent coil.

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    #3 3 years ago
    OP
     
    MIX

    Digduglus

    Pinside member

    US Cedar Rapids, IA

    8y 67,850 378 2 49

    Bottom right both times

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    #4 3 years ago
     
    MKY

    Pdxmonkey

    Pinside member

    12y 170K 7,307

    I went through three boards on a nib magneto. Finally one worked.

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    #5 3 years ago
     
    D G

    Pin_Guy

    Pinside member

    8y 103K 3,996 11

    Can someone confirm that there should be +50V Flyback suppression Voltage connected to J2-10 on this board?
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    #6 3 years ago
     
    ABC

    Crash

    Pinside member

    13y 141K 14,139

    Good point. Maybe that transistor is failing because of this phenomenon:

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    #7 3 years ago
     
    D G

    Pin_Guy

    Pinside member

    8y 103K 3,996 11

    Exactly, except with a 50V Coil Drive, this flyback voltage will easilly be several hundred volts and more than high enough to instantly destroy these transistors and MOSFETs.

    I don't know where that Red/Orange Wire on the board side of the Z Connector is running off to, but I'm guessing it should have been punched into the J2 at position 10. Have Stern send you a new harness and board. Its likely your two failed boards are easily repairable, I wouldn't toss them.

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    #8 3 years ago
     
    D G

    Pin_Guy

    Pinside member

    8y 103K 3,996 11

    Curios, What was this new wire harness supposed to do for you?

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