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I picked up a UMK3 that had 5 ROMs that would show red on the boot sequence, then it would reset. I burned new ROMs and was able to see the rest of the boot sequence. All of the RAMs, the game ROMs, the sound ROMs, U33, U59, U63, U54, U49 - all green. The final part of the sequence gets to the U64 security chip, and that shows red with an error of "PIC Chip Bad, press any button".

I swapped a known working U64 in and it gave the same error. I then put the original U64 in a known working game, and it worked fine.

Visual inspection doesn't show any corroded sockets, no touching legs on the back side, and no trace damage.

Do U47, U45, or U35 have anything to do with the processing of U64? I am trying to find which area to poke around at next. Every search comes up with people replacing an actual faulty U64, but that isn't the case here.
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