(Topic ID: 129134)

Display issues 1978 Bally Playboy

By Murphdog024

8 years ago

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Latest reply 8 years ago by barakandl
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Playboy Bally, 1978

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Hey guys!
Got my first pin two weeks ago, and I'm excited. My buddy and I have been working on a few pins for the last year. We aren't total newbies, but far from professional electricians. I'm having an issue.

It's like this: I just replaced the MPU and got the led to flash 7 times, but the machine doesn't get through the entire self-test. It stops with the displays flashing first 44 and then 46 except for the ball-in-play display which reads " 54 4" when I scroll through the test modes, the displays only show digits 4-7. I do need a new wafer 8-pin connector for the rectifier board, but is there something else going on? Thanks!

Edit: the number 5 pin on that connector is the one that's burnt up a bit.

Was the replacement MPU known working good? New header pins?

New pins in harness connectors?

Reflow solder under headers on the displays?

Connect one display at a time to see if any perform correctly by themselves?

Swap U10 and U11 to see if problem changes?

OP
Quoted from Murphdog024:
Hey guys!
Got my first pin two weeks ago, and I'm excited. My buddy and I have been working on a few pins for the last year. We aren't total newbies, but far from professional electricians. I'm having an issue.
It's like this: I just replaced the MPU and got the led to flash 7 times, but the machine doesn't get through the entire self-test. It stops with the displays flashing first 44 and then 46 except for the ball-in-play display which reads " 54 4" when I scroll through the test modes, the displays only show digits 4-7. I do need a new wafer 8-pin connector for the rectifier board, but is there something else going on? Thanks!
Edit: the number 5 pin on that connector is the one that's burnt up a bit.

If you have improper number count on every display during display test than there is a problem with the BCD data. Since you replaced the MPU. I would check the BCD pins on MPU j1. They are pin 25-28. If i was a betting man, p28 would be the most likely to get damaged since it is an end pin.

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