Back To The Future Not Saving Settings

zenomorp

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Trying to change some settings on my BTTF and it won't save them after power cycle. I saves it all after the changes, but reverts back to factory default after power cycle. I replaced the batteries and checked the battery holder. No corrosion. No issues. Anyone have any ideas before I start tearing into this deeper?

Thanks - Mike.
 
Ok, so I removed the main board and checked the voltage at the battery holder solder pads. 4.34 volts. So I know it's not a holder or battery issue. No idea where to really go from here.
 
I'm no expert in this by any means, but I am having a similar problem on my Hook right now. Clearly the power from the battery is dropping off at some point, right? If the pack is good, perhaps a bad trace or solder point along the line, or, more easily checked, perhaps the memory chips need to be pushed in a bit. Can't recall if those are socketed or not. Beyond that, I'm stumped and haven't solved my problem either...although my resets are also accompanied by boot problems.
 
my resets are also accompanied by boot problems.

I had this same issue on my GnR. It would be playing then lock up or reset and not want to boot. reseating the chips took care of the problem. A lot of those sockets can be flaky.

As far as the battery voltage, follow the trace as stated and you will find the drop off point. If you wanted to spend the money, you could get one of those ram adapters and eliminate the batteries completely.
 
FIXED! Ok. D25 was OPEN. Replaced it and the settings now save. I also decided to relocate the battery pack to prevent possible corrosion damage in the 'future.' If you wish to do this, here are some pics of what to do. Also, the very first pic is D25, the diode that was open that I replaced...

1-9.jpg


2-5.jpg


SAM_3883.jpg


Those of you guys who are having similar issues, see if D25 is open. Glad to have this fixed!

:)
 
nice job mike! knocking down these pin issues with a sledgehammer
 
Thanks man. Feels good to be able to fix these things. They're so much more intimidating that normal arcade cabs.
 
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