A quick repair for this Sky Kid (Namco) I received some days ago :
Board was in near mint condition but it didn’t boot sitting on a semi-static garbage screen (which was looping sign that watchdog was active)
Most of the devices were socketed so for first I ruled out the many custom ICs present, they were all working.Then I tested the RAMs out of circuit.Two Mitsubishi M58725P (2k x 8-bit static RAM) failed (at different address location)
Replaced them with compatible 6116 and board successfully booted with no further issue.Job done.
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