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Ace
03-11-2006, 10:15 AM
I have two MVS cartridges that do not work properly. The first is Metal Slug 3 which I have had for a while which no matter how much I clean the contacts it still gives graphics errors. The second is a Samurai Shodown which will not load at all (crashes), it has been opened at some point (ripped label) so I think that maybe one of the boards has been swapped. Maybe from another game?.

I have uploaded some pictures that may help someone point out the problems.
Metal Slug 3 crc check (custom?) http://www.zen91691.zen.co.uk/mvs/ms3crc.jpg
Metal Slug 3 PCB's http://www.zen91691.zen.co.uk/mvs/mslug3pcb.jpg
Samurai Shodown crc check http://www.zen91691.zen.co.uk/mvs/samshocrc.jpg
Samurai Shodown PCB 1 http://www.zen91691.zen.co.uk/mvs/sspcb.jpg
Samurai Shodown PCB 2 http://www.zen91691.zen.co.uk/mvs/sspcb2.jpg

Any help is very much appreciated, Ace.

JMKurtz
03-11-2006, 11:17 AM
Can you post a pic of the MS3 graphic problem?

Check the solder joints on the bottom sides to make sure they are all good. Look for any scratches on the boards that could break a trace.

Jeff

SpamYouToDeath
03-11-2006, 12:09 PM
Are the graphics problems constant or do they flicker around, even if the game is supposed to display a constant image?

Ace
03-11-2006, 12:29 PM
Certain sprites are missing completely. I do not think it is damage to the pcbs as they are mint. I think one or more of the eproms/mask roms has been damaged, maybe the cartridge has been plugged in upside down at some point?.

Ace.

chris1
03-11-2006, 02:30 PM
Fn site..I typed a whole buncha stuff and it :mad:

Have you ever tried to put the boards into the mobo out of the shell?

Sometimes a carts shell will be pressing on the boards to tight causing them to warp...Loosening the screws a little sometimes helps.

Have you ever tried to pull the carts out of the mobo slightly..





What cleaning methods are you using?

I was sold a cart with graphical errors..It went through a few hands and every person who had it used the always recommended cleaning methods(alcohol,eraser etc.....and it still had graghical issues afterwards..
The connectors were still yellow though cleaned many times..


I got my scotch brite out,cleaned the connectors to a shiny silver..used alcohol to clean the residue off and Bam the graghical issues are gone.(they were there before I cleaned the cart as I tried the cart before I cleaned it..

Ace
03-11-2006, 03:02 PM
The thing is carts I've had in the past with graphics errors due to dirty contacts still crc checked ok. I will try your suggestions though.

Anyone got pcb pics of ss1 so I confirm mine match?.

Ace.

chris1
03-11-2006, 05:32 PM
The thing is carts I've had in the past with graphics errors due to dirty contacts still crc checked ok. I will try your suggestions though.

Anyone got pcb pics of ss1 so I confirm mine match?.

Ace.

Oh yea they will crc check ok with me to when dirty...It's a few or even one pin that just not making a good enough contact to create the graphics errors ..(if dirty cart connectors is the problem)

I'll take you a SS1 board pic tomorrow morn..

Ace
03-12-2006, 01:11 PM
Thanks chris appreciate it.

chris1
03-12-2006, 04:22 PM
Thanks chris appreciate it.

Your welcome..

I'll be taking the pic soon..I gotta pull that cart out of a machine..

chris1
03-13-2006, 02:12 AM
If you need a scan LMK..

Note..I've never heard of a Samurai Shodown 1 boot,nor have ever seen one..
So 99% you don't have a boot.

http://img.photobucket.com/albums/v21/Chris1/Pictures4308.jpg

Ace
03-13-2006, 04:06 AM
Thanks again chris.

Just as I suspected my first pcb shown here http://www.zen91691.zen.co.uk/mvs/sspcb.jpg is defferent to yours shown on the left.

This could a revision? maybe the two eproms contain the data from the missing mask rom?. I guess my best bet is to desolder one of them and use romident.

I will report back with my findings. :)

Ace
03-13-2006, 07:45 AM
Turns out the data was bad on eprom1 (bit rot?) now fully working. :)

I guess bit rot can happen sooner than a lot of people think.

Ace.