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Sega Model 2B board, IC60, IC61, IC68 and IC69 bad

Tailsnic Retroworks

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Hi. I am trying to repair an error on one of my Model 2B boards. I have replaced those 4 rams with new ones, but the error persists. Has somebody seen this type of error before?

The main board has of origin SHARP LH521002AK-20 (the broken four), and I have put Mitshubishi M5M51004BJ-20 (from another Model 2B board which has 12 bad rams, I chose 4 goods).
 
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