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(Topic ID: 273438)

Blew up Black Hole

By toberlindacher

3 months ago

Topic Stats

  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 3 months ago by ChrisHibler
  • No one calls this topic a favorite


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    #1 3 months ago

    I was working on a fully working Black Hole that I just finished up repairing. A strand of solder touched the bottom transformer and bridged something else and now the game won't boot. A few coils are stuck on and it won't go into attract mode. All displays are blank and it won't go into test mode. Credit display shows 0. All my voltages seem good on the PS. Slam switch mod has been done. Fuses test good.

    At this point, all I have checked on the cpu with a logic probe is A0 and it is stuck low. Not sure where to begin on this one. Any direction to narrow it down? I have the manual and repair guide. Thanks.

    #2 3 months ago

    I would start by checking the transistors that drive those coils etc..

    #3 3 months ago

    I would pull all connectors on the MPU but power to make sure that the board is booting.

    #4 3 months ago

    Pulled all the connectors except power to MPU. I used a logic probe on the following pins of the 6502:

    Pin 1: Lo
    2: RDY: Hi
    3: Pulsing
    4: IRQ: Lo
    5: Blank
    6: Hi
    7: SYNC: Lo
    8: Hi
    9: Hi

    32: Lo
    33: Lo
    34: Hi
    35: Blank
    36: Blank
    37: Pulse
    38: Hi
    39: Pulse
    40: RES: Low for a millisecond at start up and then stays Hi

    #5 3 months ago

    I'd pull the MPU power connector too and check that...
    And then swap in another MPU if that checks out

    Also disconnect the aux power supply, etc

    #6 3 months ago

    Power Connector is fine. Don't have another MPU to test.

    How do my 6502 pin measurements look? I'm not really sure if they are doing what they are supposed to be doing.

    #7 3 months ago

    If you have a "hot zero" on the display, the MPU isn't booting.
    That is problem #1.
    Dropping a bit of solder on the transformer area doesn't seem like it would be caused by this. Typically, this is caused by shoring HV to the switch matrix. This kills some of Z11-Z15, but may also kill U4, which will cause the MPU to not boot.

    System 80 MPU problem diagnosis isn't easy. You need something like the g-p-e QS80 (NLA) or the PiniTech adapter for Marco's ROM. If you don't have one of those, it's a tough go. You can diode test Z11-Z15 and U4 or perhaps U4 will be hotter to the touch than U5/U6.

    Much easier to send it to a pro. I'm happy to help if you'd like.
    Chris Hibler - CARGPB #31 ... for board repairs - The Place to go for Pinball Repair Info

    #8 3 months ago

    ChrisHibler: I think I did short HV to the switch matrix as it was a strand of solder that touched the HV on the transformer to a switch. Maybe the tilt switch or flipper switch. I definitely think it killed the MPU. I'll contact you for details.

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