(Topic ID: 230163)

Bally Lost World rectifier/power supply issue

By Tbever

1 year ago

Topic Stats

  • 51 posts
  • 12 Pinsiders participating
  • Latest reply 1 year ago by Tbever
  • Topic is favorited by 3 Pinsiders


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    #16 1 year ago

    Those voltages are not that far off. What are you getting on the solenoid driver board? TP5 should be 11.9 VDC and TP1 should be 5 VDC.

    When you turn it on do you get anything on the LED on the MPU?

    #18 1 year ago

    The power supply supplies 11.9 volts to the driver board - the driver board sends 11.9 and 5 volts to the MPU.

    Is the LED solid on or solid off?

    #35 1 year ago

    You'll never have a reliable game with those connectors. I always replace all headers and all connectors on every board.

    You also need to remove all the corrosion on that MPU. Make sure you get it all cleaned because it will keep coming back. Check all the IC sockets to make sure they're clean - replace if they look suspect. Then install a remote battery or NVRAM.

    If your LED is solid on then the MPU is not booting. Probably not getting 5 volts at TP5 because of the connectors. If you're getting 2 flashes the 5101 RAM is not working. Check the U8 socket - it's in the corrosion zone.

    #38 1 year ago

    I've had very good success with these:

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