Aes with graphics issue tests fine with diagnostic bios

vitalsfa

n00b
Joined
Jul 5, 2017
Posts
4
Got a customers 3-5 in system boots to a blue screen with no cart, diagnostic bios says all hardware passes, but the NeoGeo logo is missing from boot and the background is copied up the screen, and the sprites are messed up. before I start diving in this thing with a logic analyzer and oscilloscope can anyone point in the general direction.
 

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,748
Either dirty cart slot, or bad traces from slot.
 

vitalsfa

n00b
Joined
Jul 5, 2017
Posts
4
Was a damaged trace going to that flip flop kinda of figure it was some glue logic, just seeing that I was getting a visual error with no hardware error, the diagnostic bios was getting the proper data back but the I am guessing the way it checks, it must not be able to see a problem with the logic. But on another not did find some modern replacements for the smd sram on the board
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