(Topic ID: 232585)

Stern Stars wacky display issue


By lowkeyfilms

5 months ago



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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 5 months ago by lowkeyfilms
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    #1 5 months ago

    Stern stars w rebuilt driver board.

    Displays all have 22. On them and scoring is random. It mostly just puts 2's, 3's 6's and 7's with no ryme or reason.

    All other funtions work. (Except pop bumper which is dissconnect as it stays energizered on boot up)

    All game play lights and plays as it should.
    It cycles players and 5 balls.

    Bonus works and drop downs pop up.

    Any advice would help allot.

    Ive had all the boards off and inspected and tested on T points. Tests good. (Ill recheck its been a while)

    20181227_112704 (resized).jpg
    #2 5 months ago

    There's 4 signals from the MPU board to the displays which tells them which number to display.
    On the MPU board schematic, these 4 signals marked D0, D1, D2 and D3 come off connector J1 pins 25, 26, 27 and 28 respectively.
    In the table below I've listed all 16 binary combinations of these 4 signals (0=0 volts, 1=5 volts) which determine the display number.
    Since you're only seeing numbers 2, 3, 6 and 7 we can see that the displays are never seeing signal D1 go to zero volts.
    It means you likely have a bad connection on that signal and it's probably at the MPU board terminal pin 26 of connector J1.
    You'll have to inspect the MPU board J1 pin header for corrosion and remove the wire terminal from pin 26 of the connector housing and replace it.

    DDDD
    3210 .. Digit
    =============
    0000 .. 0
    0001 .. 1
    0010 .. 2
    0011 .. 3
    0100 .. 4
    0101 .. 5
    0110 .. 6
    0111 .. 7
    1000 .. 8
    1001 .. 9
    1010 .. blank
    1011 .. blank
    1100 .. blank
    1101 .. blank
    1110 .. blank
    1111 .. blank

    #3 5 months ago

    quench, good stuff i like it!

    #4 5 months ago

    Quench I cannot thank you enough for taking the time to spell that out for me. I have a schematic but never would have figured that out. I hope santa was good to you

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