Playchoice 10 Duplicate Game Titles Listed

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I just picked up this Tabletop PC10 and when I have all 10 slots filled, it duplicates the first 4, showing them twice, for 8 total.

As a test I put in just Rad Racer 2, and Excitebike, and ONLY rad racer 2 showed up, but twice.

Not really sure what the next step is, just get another PCK1-02-CPU board?
Will the same single-monitor playchoice PCK1-02-CPU board work for me?

Thank you.
 

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the address/cart selection circuit that reads the security rom/eeprom has an issue, you will need to identify it, and replace.
 
I finally got around to fixing this (with a friend's help).

Checked continuity of pins 7, 9, 10, 11 of the 74LS259 at location 7E to pins 15, 14, 13, 12 of the 74LS42 at location 4T.

Pin 10->13 had no continuity, so I ran a jumper wire and it is fixed :)
 
thanks for the follow up! notes like this help others find the same problems or where to look when they have issues.
 
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