Konami Mystic Warriors PCB problem

J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
I recently bought a Mystic Warriors PCB from a reputable seller on this forum.

When I try to boot up the board, the only thing that I get is a black screen with "ROM RAM CHECK" at the top.


-I have left the cab on for more than 15 minutes, and nothing happens, there are no hot or cold areas on the board after running it for awhile.

-There is a test switch on the PCB, pushing it does nothing (The monitor picture doesn't even jump).

-The board is very clean, there are no burns or scratches or obvious signs of a broken trace.

-I Reseated all socketed chips, and cleaned the jamma connection with a pencil eraser.

-The Test and Service switches on the cab do nothing (I am attempting to run this board in an Astro City).

I was hoping someone here might have some insight as to what the problem is. Any help would be greatly appreciated.

Thanks.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
Thanks guys, I'm pretty sure the -5v is hooked up, but I'll double check when I get home from work tonight.
 
N

Neogeofan12

Banned
Joined
Oct 30, 2007
Posts
1,087
I'm the one who sold him the game and I don't believe this game even use -5v, but I could be wrong.
 
channelmaniac

channelmaniac

Mr Neo Fix-it
15 Year Member
Joined
Nov 29, 2005
Posts
4,316
Hold down the test button while powering it on... Keep it held down until it says EEPROM Data Clear. Should take a few seconds to do.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
The -5v is hooked up on the jamma harness, and seems to test fine.

CM- I Held the test switch down while powering on, it initialized the EEPROM data, but just returns to the "RAM ROM CHECK" screen afterward. I did it a couple of times, using both the test switch on the board, and the test switch on the cab, getting the same results.

Thanks for all of the help, any other ideas?
 
Xian Xi

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,762
Did you try pressing start or button 1 when you saw the RAM ROM CHECK screen?
 
Xian Xi

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,762
Do you have a friend near by that has a cab or supergun to test the board out on? This way you can figure out if it's the board or your cab at least.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
Xian Xi said:
Do you have a friend near by that has a cab or supergun to test the board out on? This way you can figure out if it's the board or your cab at least.
Click to expand...

I'll give that a shot. I've run a wide variety of boards on this cab with no problem though (CPS2, PGM, AW, various Taito, Irem, Konami, and Capcom PCBs).
 
C

cgbartek

Crazed MVS Addict
Joined
Dec 11, 2006
Posts
141
From my experiences, Konami boards are very picky about the +5v. Check your voltages and make sure it's getting exactly 5.0v. Anything less and it won't boot, anything more and you could fry it (been there, done that).

But yeah, Neogeofan12 actually tested the PCB on my Blast City a few weeks ago and it worked great, so I can vouch that it was working before he sent it.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
I'm getting 5.05v at the jamma harness. Would the extra .05 be significant enough to cause a problem?

I don't know how to adjust this on my Astro. . .
 
C

cgbartek

Crazed MVS Addict
Joined
Dec 11, 2006
Posts
141
I'm getting 5.05v at the jamma harness.
Click to expand...
You should be golden then. Come to think of it I'm not sure how to adjust an Astro PSU either. I'd imagine there's a hole with a potentiometer sticking out of it somewhere, who knows.

Well I'm out of ideas, sorry man. If you can't test it out on another cab I'd assume the board has bad RAM somewhere.

Chris
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
I tried the board in a friend's cab last night, and got the same results, so I'm now certain that it's the board, and not the cab.

ChannelManiac, is this something that you can fix?
 
Arcademan

Arcademan

Now...It's OFFICIAL!!!
20 Year Member
Joined
Sep 14, 2003
Posts
20,765
Well, since the problem appeared on another machine, it's safe to assume you have a bad ROM and/or RAM on the board. As far as a fix, it would need to be replaced but how to find which one it is...don't have any idea. Sorry.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
SO if it's an issue with the ROM chips, I don't know how to fix it.

Would reflowing the solder joints of the chips help?

Is there anyone on the board who can burn new roms?
 
Xian Xi

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,762
Sometimes it works if you remove the chips and reseat them back into the socket
 
I

IronGiant

Armored Scrum Object
Joined
Jan 10, 2004
Posts
263
Joshua - did you ever manage to fix this? I've just repaired a Mystic Warriors board so perhaps I could help? One thing that's a possible cause is a knocked/lifted lef on one of the surface mount ICs.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
Thanks I.G., I can't see anything wrong with the ICs, but I don't have the precision soldering equipment I think that I would need to fix that anyway. . .

I'd offer to pay you to fix the board, but I'm sure that shipping it back and forth to the UK would be crazy expensive.
 
I

IronGiant

Armored Scrum Object
Joined
Jan 10, 2004
Posts
263
Yeah, shipping to and from the UK would probably be prohibitive.

Channelmaniac here might be able to help though?
 
Xian Xi

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,762
Do you have a logic probe? You might want to check the CPU clock to see if it's working. Could be the RAM is stuck high or something.
 
J

JoshuaMiller

Krauser's Shoe Shiner
Joined
Aug 16, 2007
Posts
241
Thanks for the suggestions XX, but I've come to the conclusion that repairing the board is outside of my abilities and have sent it to Channelmaniac.
 
You must log in or register to reply here.
Top