MVS 1-slot and 2-slot woes: Backup Ram errors, resetting etc.
I have THREE bad mvs systems and I'm wondering if any are worth salvaging:
TWO SLOT:
_________________________________________
Ive got a 2-slot that is having a backup ram error. - Everytime says:
"BACKUP RAM ERROR 5555 B255
As I understand, this could be traces bad from the ram to the CPU, or bad ram - the ones near the battery.
I think I found the rams near battery - looks like there might be some corrosion, but not entirely sure - I think the battery is bad. I can just measure on the board, I assume?
Is that right - replace the SRAM's close to the battery?
MV1C - ONE SLOT:
__________________________________________
This one resets with certain games; others - works fine.
I see this with my 161-1 ; and my only other MVS cart (Metal Slug X)
Metal Slug X - resets upon booting toe title screen.
Many of the old games on the 161-1 work fine - I've played Robo Army, Viewpoint, Crossed Swords, etc. - no problem.
Ive tested my carts in my single working MVS - they both work fine.
I've tried cleaning contacts, checking the voltage - using the boards in another machine, etc. - no dice.
MV1-B - ONE SLOT:
__________________________________________
This one doesn't boot, and gives a backup ram error - but it gives a different error each time, it seems.
What does it mean if it changes everytime?
I'm trying to DIY on these, any help greatly appreciated!
I have THREE bad mvs systems and I'm wondering if any are worth salvaging:
TWO SLOT:
_________________________________________
Ive got a 2-slot that is having a backup ram error. - Everytime says:
"BACKUP RAM ERROR 5555 B255
As I understand, this could be traces bad from the ram to the CPU, or bad ram - the ones near the battery.
I think I found the rams near battery - looks like there might be some corrosion, but not entirely sure - I think the battery is bad. I can just measure on the board, I assume?
Is that right - replace the SRAM's close to the battery?
MV1C - ONE SLOT:
__________________________________________
This one resets with certain games; others - works fine.
I see this with my 161-1 ; and my only other MVS cart (Metal Slug X)
Metal Slug X - resets upon booting toe title screen.
Many of the old games on the 161-1 work fine - I've played Robo Army, Viewpoint, Crossed Swords, etc. - no problem.
Ive tested my carts in my single working MVS - they both work fine.
I've tried cleaning contacts, checking the voltage - using the boards in another machine, etc. - no dice.
MV1-B - ONE SLOT:
__________________________________________
This one doesn't boot, and gives a backup ram error - but it gives a different error each time, it seems.
What does it mean if it changes everytime?
I'm trying to DIY on these, any help greatly appreciated!
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