(Topic ID: 234329)

Help with Bally 7 Digit Display

By Fordiesel69

5 months ago

Topic Stats

  • 14 posts
  • 6 Pinsiders participating
  • Latest reply 5 months ago by Fordiesel69
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    #1 5 months ago

    Can anyone tell me what location the drivers are for this digit? Also the location of the resistors?


    Display (resized).jpg
    #3 5 months ago

    Changed Q3 and Q9 with no success. They tested perfect so i didnt thing that was it. Anything else I should check. Nothing burnt, and all solder is reflowed as there was cold joints on header.

    #4 5 months ago

    Keep on reading section Resistors can measure out of spec with no visible sign of damage.

    #5 5 months ago

    Check the 100k resistor for that digit. They often fail.

    #6 5 months ago
    Quoted from jj44114:

    Check the 100k resistor for that digit. They often fail.

    These are in the row close to the glass.

    #7 5 months ago

    R5 was open. Looked perfect. Two of my brand new ones were open too...

    #8 5 months ago

    Yes it’s a resistor failure for sure. You have to pull from circuit and test

    #9 5 months ago

    When you compare the resistance on all the 100k reaistors on the board, it will be very noticable. Resistance goes higher as the resistor fail.

    #10 5 months ago
    Quoted from Barakawins1:

    You have to pull from circuit and test

    Thought that was for a diode, not resistor?

    #11 5 months ago

    Sometimes resistors test funny in circuit. I always pull one leg. It should be a 100k ohm resistor.

    #12 5 months ago

    The 100k resistors can be tested in circuit. Any where between 80k and 130k is fine. They fail by burning and going open or having very high resistance.

    #13 5 months ago

    Does the problem move if you swap the display with another?

    #14 5 months ago

    I replaced R5 and all is well. Thanks.

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