mv1fs video ram error

[roy]

hey
bought this board yesterday
see pic attached
tried using unibios 4.0 and all i got was test screen ...
any ideas how to fix it?
thanks

 

[shadowkn55]

Replace the sram at locations B4 and B5.

 

[Rom1]

Before replacing chip, check continuity of data line for B4/B5 RAM. The lower one is failing but it maybe not related to ram chip itself.

Have a look here:
https://wiki.neogeodev.org/index.php?title=Repair_help#MVS
https://wiki.neogeodev.org/index.php?title=RAM_chip#MV1FS

 

[roy]

the seller was kind enough to replace the board
can I use ml2032 battery 3v
instead of the original gb50h-3 3.6v
both are rechargeable
thank you!

 

[PascalP]

Easy ram swap, had the same on my board.

and yes that battery is fine, but you can also install a CR2032 and disable the charging circuit

 

[Rom1]

Yes it's ok