Help! Capcom with corrupted graphics

[Iwein]

Hello,

i have a capcom final fight with corrupt graphics. I have only one set so it's not possible to swap boards for testing. At first sight the signals to the eprom's are good. I see no visual dammage or bend pins on the backside from the pcb's.

pictures from the graphics in the attachments.

Anny sugestions?

Greetings from Holland,
Iwein

[StatFreak]

Welcome to NLG Iwein


I split your post into a new topic and moved it to the Arcade Games: Video board. Hopefully, one of our members will be able to help you with your issue.


StatFreak
  Global Moderator

[channelmaniac]

Ewww...

I hate working on Capcom boards with that problem.

CPS1 boards can have that problem show up for a variety of reasons...

#1: Look for any physical damage, liquid spills, messed up traces, etc...

#2: Check to see if the C board is bad. Push firmly down on the surface mount chip and see if the corruption changes. If so, resolder that big chip.

#3: Remove and reseat the boards.

#4: Check the board interconnects with a continuity test to see if each pin is making contact.

#5: Test each graphics ROM in an EPROM programmer. Compare the checksums against the ROMIDENT database.

#6: Swap the A board. It's most likely a problem with the big custom chip there.

RJ

[Iwein]

Update:

#1: no damage and evrything looks ok (already done before the first post)
#2: no changes when pushing at the surface mount chip, reflowed the solder to be sure, no changes
#3: already done before the first post
#4: still to do
#5: roms tested, compared with romident, OK
#6: i have no other boards to swap:-(

Only thing left is testing the connectors, if this is test is ok the board goes to the shelf.

Greetings and thanks from Holland,

Iwein

[nightmaretony]

Looks like sprite addressing to me. the background layer is a set of tiled sprites with a repeating pattern. BEST BET: if the pins are fairly long and sharp on manu chips, cut them down flush with a pair of cutters. Two may be touching which would cause that kind of goofiness, especially in the graphics eprom area.