Get a PLCC extraction tool and then look at this page:
https://www.greatplainselectronics.com/Information.asp?region=139
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Get a PLCC extraction tool and then look at this page:
https://www.greatplainselectronics.com/Information.asp?region=139
Looks like a defective MPU board to me.
Extraneous solder balls under a surface mounted PLCC socket is never a good thing. Doesn't take much to dislodge a solder ball and cause random shorts - such as inserting PLCC IC into socket or reseating it.
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