shinobi system 16 sprites scrambles

[Retroman839]

trying to help a friend fix his shinobi
characters sprites garbled

would a new object roms ?

i have the schimatics but unsure which rom holds the character sprites

i have roms and a rom reader /writer

any hep apretiated

 

[stevebm1]

Has the board been de-suicided?,if not it could be the battery starting to die in the processor chip

 

[sukhbir]

Looks like a ram issue.

 

[Retroman839]

like if it’s ram
what’s the best ram to look for?
object ram?
sprit ram?

if it’s suicide
what’s best way to go forward to fix it?
all help appretiated thanx

 

[tb2000]

Could be a bad logic chip also. You can reprogramme the suicide chip with the right gear.tb20002021-11-21 20:45:25