Help me save at least 5 cpsIII?

[TheBortot]

Hi, i got some faulty motherboards here and i'll try to ressurect them, but got no information at all about cpsIII scheme. Do you have some or at least know what each CI does on the motherboard?

 

[TheBortot]

Now each pcb problem...

First: consider that i have a perfect set of simms and a perfect cartridge, tested on a sixth board, running everything ok.


At least, i know something: no image at all CAN be 64 simm problems or the cartridge was not recognized by the pcb.




PCB 1: game runs, but has graphic issues.
PCB2,4 and 5: black screen.
PCB3: static colored image.

 

[ekorz]

Pcb layout and chip info:

https://github.com/mamedev/mame/blo...5e4537514e774b/src/mame/drivers/cps3.cpp#L239

 

[TheBortot]

sixth board running ok: