(Topic ID: 211831)

Help: None of new score displays working. Lost World

By crazybruce10

6 years ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 6 years ago by BigAl56
  • Topic is favorited by 2 Pinsiders

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    #1 6 years ago

    I can't figure this one out. I have 5 new Wolffpac tech score displays. I have new Rottendog solenoid board. I am working with 1978 Lost World. I had problems with old score displays. (Burnt traces, burnt resistors,etc). Now I install all 5 new Wolffpac displays and none work. I swap my old ones in and I get some digits. So I can't see all 5 new displays not working, I know power is getting to the displays as proof with old displays getting life. My self test button is not working so that doesn't help. The Wolffpac tech people have been very helpful with suggestions but I am at a lost. Any ideas or people who have experience with this.

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    #2 6 years ago

    Tried swapping just one new display in? Could be just one is bad but it's taking the rest out. I assume there's 5v at the displays? Is the game still booting to attract mode with the new displays?

    #3 6 years ago

    Tried with just one, doesn't work. I'm sorry but not sure what attract mode means.

    #4 6 years ago

    +1 on checking for 5v. Did you repin the display cables with .156 Trifurcon crimp terminals? I've had several where the issue was light corrosion and the magic was in rebuilding both sides - you have new male pins on the displays - so Id start with the cable ends at the displays if you have not tried that already. BPR

    #5 6 years ago

    Yes. Repinned all connectors to displays. Resoldered all heads on all boards. Repinned all connectors on all boards. Used 0.156 trifurcon pins. All fuses are good.

    #6 6 years ago

    So no +5 volts is what you are saying?
    In investigating this I found a typo in the schematic. However the 5v comes in on Pin 20 of the display connector, a 48 (Gn/Bk) wire to J3-17 of the solenoid driver. First check that wire and make sure it goes back to J3-17 on the solenoid board. If I have to guess, J3 on the sol driver is open. Try resoldering the pins on J3 and see if that helps. Pay special attention to pin 17.

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