Neo Geo MV-2 Backup Ram Error

Hi guys, I recently bought a beatdown MV-2 Motherboard off ebay with a Backup-RAM-Error 00D0010 written 5555 read 5540 and desoldered Battery.



Xian Xi already gave me the advice in another thread, which I really appreciate, but I want to widen the audience, maybe someone of you encountered EXACTLY the same problem I have now. My friend already soldered a bridge without probing if the trace is broken (yeah, don't kill me or him for that). How should we proceed?
My plan is removing the pad from the back, checking for corrosion and probing every trace going from the backup chips to corresponding chips for continuity.
Attached a picture of the board (including soldered bridges) and yeah, we will clean it before checking the traces. And while I am at it: which is the lower backup-RAM of the two chips.



I am thankful for every tip that could guide me to a less painful fixing process, and yeah, I already dived through the forum.

Greets, hugs and kisses!

EDIT: this is not my universe bios, I usually buy it and will buy from Raz

I think the way you are proposing to go about it is just the right one. However (as I have told you also) my guess would be that one or both of the chips themselves are faulty. Best prepare to get some new ones.

Make sure you are working on the right set of RAM, in that pic I believe is the Work RAM. If pin 28 is directly connected to +5v then it's Work RAM.

In that document it is stated that the chips with 43256 underneath are the backup RAMs.
http://www.mediafire.com/download/1...locations+and+their+functionality+-+rev+5.doc
Or am I wrong on that?

EDIT: H3 and H4!

I just checked my MV2, yes H3 and H4. The info I saw had them reversed then corrected later in the text..lol

From the documentation I gathered this