- Thread starter GumGum
- Start date
I think that would indicate that both are failing since you're getting a mismatch on both the high and low values.
Details: https://wiki.neogeodev.org/index.ph...0220529124245#Backup.2FWork.2FVideo_RAM_error
I would take a look at the area and see if there's a data line that looks damaged (it's near the battery, so look for damage caused by a leak. If you do replace them, here's the chip locations.
https://github.com/jwestfall69/neogeo-diag-bios/blob/master/docs/ram_locations/mv1f.md
Details: https://wiki.neogeodev.org/index.ph...0220529124245#Backup.2FWork.2FVideo_RAM_error
I would take a look at the area and see if there's a data line that looks damaged (it's near the battery, so look for damage caused by a leak. If you do replace them, here's the chip locations.
https://github.com/jwestfall69/neogeo-diag-bios/blob/master/docs/ram_locations/mv1f.md
i see. I replaced the original with coin cell battery holder like few weeks ago. Everything seems to run fine up until now.
Do you reckon it has anything to do with coin cell battery holder installed? or was it more a very common issue with backup ram failure in mv1fs?
Do you reckon it has anything to do with coin cell battery holder installed? or was it more a very common issue with backup ram failure in mv1fs?
No, the coin cell battery should be fine (but unless you disabled the recharging circuit make sure you're using a rechargeable LIR2032 and not a CR2032). What I was thinking was that the old battery might have leaked, and eaten through some of the traces in the area where the backup RAM is. Seems a little odd that both would fail in the same way. But, always possible. If you have the NeoDiagnostics BIOS that might give more details. But as I said, from my reading of the error both chips are showing the wrong value. If only the low ram had failed, I would expect to see 5540 and if it were just the high it would read B255.
ok oddest thing just happened. I took the board, and then clean up the solder side with isopropyl alcohol because I see some glue residue remaint... then when I hook up the board back, ram backup failure is gone.... it's odd...
Franco23444
Grand Master
A possible short? Maybe?
Could have been something conductive that was causing a short that you cleaned off. (Shrug)
I’d get the diagnostic bios and see if it finds any other issues, but working is working.