(Topic ID: 272018)

Bally/Stern Display Repair Guides?

By ibis

14 days ago

Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 13 days ago by jj44114
  • Topic is favorited by 1 Pinsider


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    #1 14 days ago

    Does anyone know of a step-by-step guide to testing, troubleshooting and repairing these displays? I know Pinwiki has info on them but its not exactly an easy 'guide' on how to fix them. Its more of a lesson of sorts and its kind of hard to follow. I would love to learn this process and repair technique. If there isn't one, maybe someone can offer to post one?? Would be awesome!

    #2 14 days ago

    pm sent with some great info from Steve Kulpa.

    Here's the link from the wayback machine as it's no longer live: https://web.archive.org/web/20170612235057/http://stevekulpa.net/pinball/bally_disp6r.htm

    #3 14 days ago

    #1. The male connector always have broken solder joints. Besides that the basic failures are....

    Digit always on (bright) is bad level shifter. Bad level shifter left too long will burn out the 100k resistor

    Digit always off bad digit driver or burnt 100k resistor, usually resistor burns because a digit locked on.

    Same segment of each digit on a single display is probably bad segment driver or bad 4543 decoder chip.

    Digit counts wrong on all displays 1,1,3,3, etc. Try one display at a time. Still wrong count display BCD data issue between MPU and displays, connectors! If wrong count stays at only one display and connectors are good bad 4543 decoder chip

    Gibberish random segments on all displays. Try one display at time. If you find one display effecting the rest that display probably has a bad 4543 decoder. Because the data is shared one bad decoder can muck up the rest.

    Segment driver, level shifter, and digit driver are all labeled on the schematics

    #4 14 days ago

    I remembered that Bally actually did make a step by step repair procedure. It is in the 560-03 pinball repair book and starts at page 46.


    I honestly don't usually like probing around HV stuff tho. After fixing a few games with display problems you can usually tell what component is bad just by the behavior of the display, after of course making sure the connectors are good.

    #5 14 days ago

    Thanks for all the info. I think some of the diagnosis steps are just basically needed. Like if a digit is always off, the 100K resistor is probably bad, but it went bad because the level shifter was bad. So its like a cascade effect. All great info and thanks so much, looking forward to learning more about general repair of these displays.

    #6 13 days ago
    Quoted from ibis:

    Like if a digit is always off, the 100K resistor is probably bad


    Are you sure you looked in the "Problems and Solutions" section of the PinWiki?
    Chris Hibler - CARGPB #31
    http://www.ChrisHiblerPinball.com/Contact ... for board repairs
    http://www.PinWiki.com - The Place to go for Pinball Repair Info

    #7 13 days ago

    It’s all there.

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