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maybe a chip put in wrong.
5v at a chip
So one chip put in wrong could affect all others?
Exacly 5V? which pin?
Since the data is the same for both eprom configurations,
I've always assumed that there must be some jumper or DIP setting on the main board
that would indicate what eprom configuration is used.
... although I've never found info on that.
(... anyone who knows this would be most welcomed to comment... )
In your case , since it appears to only be the graphic eproms that are bad,
I strongly suspect that your board is somehow set to the 4Mb eprom setting
(...because it is showing the AUX board on boot-up )
when perhaps it should be set to the 4Mb eprom setting.
(...do you have an AUX board ? )
But like I said, this is merely my best guess
based on info I "believe" to be good, but never really validated...
I really can't see any other explanation that would only affect the graphic eproms only.
The game (code) roms at UJ12 and UG12 are good,
so a short on the eprom bus would appear unlikely...
Good luck...
Steph
don't probe the wrong legs.
So those are two places where I can find the 5V or do I put the black and red of my multimeter on those two pins?

Another update! I didn't fix the dipswitch yet but... I got an amazing find I beleive. It's Mortal Kombat 2 revision 2.0, very rare.
See my video here: http://www.youtube.com/watch?v=IFxnL3H4rdY&feature=plcp
MK-II boards came in two eprom configurations (for graphic eproms)
12 x 8Mb eproms
or
24 x 4Mb eproms
Since the main board only has 16 sockets for graphic eproms (UG13-24, UJ13-24),
an AUX board was used to accommodate the 8 extra 4Mb eproms.
So some MK-II are single boards with 12 x 8Mb eproms,
while others are dual-boards with 24 x 4Mb eproms.
Since the data is the same for both eprom configurations,
I've always assumed that there must be some jumper or DIP setting on the main board
that would indicate what eprom configuration is used.
... although I've never found info on that.
(... anyone who knows this would be most welcomed to comment... )
In your case , since it appears to only be the graphic eproms that are bad,
I strongly suspect that your board is somehow set to the 4Mb eprom setting
(...because it is showing the AUX board on boot-up )
when perhaps it should be set to the 4Mb eprom setting.
(...do you have an AUX board ? )
But like I said, this is merely my best guess
based on info I "believe" to be good, but never really validated...
I really can't see any other explanation that would only affect the graphic eproms only.
The game (code) roms at UJ12 and UG12 are good,
so a short on the eprom bus would appear unlikely...
Good luck...
Steph