Strange issue with Blood Bros Original

[Morzana]

Any idea ? Sync adjusted

 

[stj]

does the board have a group of 74ls161's ??

 

[Morzana]

does the board have a group of 74ls161's ??

No

PCB looks like this one

 

[Apocalypse]

Cold solders on SMD chips?
Failing RAM on address lines (giving a repeated pattern)?

 

[Morzana]

Cold solders on SMD chips?
Failing RAM on address lines (giving a repeated pattern)?

Reflow GFX SMD Chip (in green)
- SEI0210 custom (128 pin PQFP)
- SEI0220BP custom (80 pin PQFP)
- SEI0200 custom (100 pin PQFP)
- SEI0160 custom (60 pin PQFP)

Activity on GFX Ram are ok with logic probe (in red)
HM6265

I will see with an oscilloscope for weird signal

Eventually, I will desolder the rams and test them with eprom programmer