REMOVE the battery holder and VISUALLY INSPECT AND TEST ALL TRACES behind it and through to the connector. You could have multiple broken traces.
Also, I recently fixed an issue like this where the IC at U44 was bad on the MPU.
(Topic ID: 170759)
Linked Games
Grand Lizard
Williams, 1986
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Quoted from wildinindiana:Okay, I don't have an off board solution at the moment. It is a brand new battery holder with new batteries... Once I get my order in with the off board solution, I will swap them out. Not sure why I'm inviting it to happen again with the corrosion remediation, and a new battery holder...?
You need to stop making excuses for using the "on board" battery holder and start coming up with excuses to NOT just buy the NVRAM solution. Minimum, buy a plastic battery holder and remotely mount it. The battery holders on sys 11 pcbs just get in the damn way when trying to resolve MPU issues!
Quoted from GRUMPY:SCR 2 and SCR 3 are installed incorrectly. The resistor packs are off by one pin. Fix and retest.
How would the game work properly in the first post "at the fellas house" then? The OP did not change or replace those components. I suspect they are fine and just jumped by one pin on the backside of the MPU.
Quoted from GRUMPY:I wonder why I even try to help any more.
Take a pill man. I didn't notice that he replaced them since the game originally worked properly... anyone can make a mistake. Now I am wondering if the original ones were tested before replacing them.
Quoted from johnwartjr:He said he replaced them in the very 1st post.
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