Neo Geo MV1FZ RAM issues

roro408

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Donor 2016
Joined
Apr 17, 2016
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San Jose, California
I recently got a partially working board and it was initially showing a color RAM error, now it will sometimes show a work RAM error as well.
The strange part is there is no address shown like I have seen with other posts and pictures.
The original owner provided the Color RAM address from the last time he worked on it, 00400000 write 5555 read FB55.

The board was missing some ceramic caps from the bottom in locations marked PC, I found a post that mentioned they were 0.1uf bypass caps, so I soldered a few in place around the RAM areas but it made no difference.

Any pointers on what to try next would be appreciated, I only have some simple tools, DMM and a logic probe.

work RAM error

color RAM error

RAM on board

Thank you,
Ro
 
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