Neo Geo 4 Slot Work Ram Error

neopolss

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Donor 6 years: 2013, 2016-2020
Joined
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Location
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I've got a 4 slot board with the following message:

Work Ram Error
Address 00101800
Write
5555
Read
5515

I have changed the battery and cleaned some green corrosion from the board, but as far as this error, is there a location that it is trying to tell me or where should I start looking?
 
Yup... 62256 type surface mount (SOIC) SRAM chip. 32k x 8.

Simple to replace.
 
How did you determine the location of the error? I'd like to understand the error code or perhaps there is a good link describing the troubleshooting? Thanks guys.
 
I also have two boards with work ram errors..

Replace all 4 chips?

Would just like to replace the one bad chip.

I get Wr: AAAA, Rd: ABAA

Worst case is replace the two inner chips?
 
Check my repair logs on the NLG.net site and you'll find the locations of the chips to errors.
 
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