MVS MV-1A Board help

[gizmodrake]

Hi guy's, I have been reparing Jamma boards few months now as a hobby and I have come across my first faulty MV-1A board. The fault code I'm getting is this:

COLOUR RAM BANK0 ERROR

ADDRESS      WRITE    READ
00400000      5555      B255

Is this a LSPC IC fault? I am unable to find an LSPC IC on my board unless some of the writing has worn off.

I really appriciate your help!

Many thanks, Gavin

[gizmodrake]

Ok I have now checked the board over and it looks as though it may be missing a surface mount cap that looks like it may have been knocked off the board. Is this the likely cause of the problem?

[nightmaretony]

Nope, one of your color pallete RAMs died out and has random data in it. There are 6 surface mount 65256. The pallete RAM is 6264 RAMs. One of them has bade enables, most likely. Look for corrsion to them.

The LSPC: Line Sprite Picture Creator is the main grapics chip, usually LSPC-A0 for the earlier chipset. A1 or A2 wou,d be that int he later revisions.