Mortal Kombat 1 PCB Issues - Bad RAM U66 ?

robotsimp

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hi all, was hoping to get some advice on an issue Im having on an "untested" MK1 board I just purchased (yeah im a sucker)

Running this in a working UMK3 cab, The board starts up and gets to the RAM check and then at the U66 chip goes it red. After that the screen turns to fuzz.

have: MK1 Y-Unit Board, Sound Board, Ribbon Cable, Sound power cable, sound pot

same symptoms without sound board attached


Heres a GIF and some screenshots of what is happening:

https://imgur.com/a/7qdxS

Should I focus on swapping the RAM chip first (best way to do that)?
Would any NEC d41464c-10 RAM chip work (seems to be quite a few on ebay)?
anything else to be prepared or check for?

Any help would be truly appreciated!
 
I had a mk1 that flagged one of those rams as bad before turn out the +5 was reading around 4.6 once adjusted correctly worked fine

If it still comes up with that error but voltage tests out ok chevk for any pins that are touching each other in that area if thats fine just replace it just watch out for some ebay ones as they could be fakex as in not a ram at all best off buying off a good known parts supplier
 
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