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  4. » Early Bally, can't get 4th flash from the MPU. U10 chip and socket replaced.
(Topic ID: 99236)

Early Bally, can't get 4th flash from the MPU. U10 chip and socket replaced.

By mg81

9 years ago


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#12 3 years ago
 
AMS

barakandl

nvram.weebly.com

12y 132K 10,413

There is a trace coming from the zero cross detector that passes along tight spaced to one of the PIAs solder pad row... i think its U10. More than once have I seen a PIA leg short to that trace and make the power on self test fail.

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