Super Mario Bros 2 Playchoice Blank Blue Screen

smeagolsama

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Playchoice 10 Issues, see latest post

Please see the latest post 9/12 for a new game I got that has an issue and an existing game showing an issue.


I got a new playchoice PCB last night which is always a good thing. Super Mario Brothers 2. Its not working so here we go:

Motherboard
Dual Monitor
PCH-04

Game
Super Mario Brothers 2
Symptons

The game shows up in the game list and I can start it. Upon starting it the instructions show up and I can scroll through them just fine. The bottom screen just displays a constant blue, and I can't do anything from there. Every other game works just fine while this one is installed.

I've cleaned the pins with some light light toothbrush scrubbing and 90 percent alcohol and have tried it in many different slots. I also have a few other G style ROMS that work fine in this machine including Super Mario Brothers 3 and TMNT 2. One thing this board doesn't have that some of my others do and pictures on the net is no jumpers or caps on the backside.
 
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Any idea, I'd like to bury this problem this weekend.

I put the 2 chips U1 and U3 from the SMB2 G rom board onto my SMB3 G rom board, and was a no go all the way around. PC wouldn't boot to the menu when I did that . Reverted back to normal and it works fine. Not sure if that helps anybody.
 
Planning on having the chips reburnt in the future, but I'm not going be able to get to that anytime soon, so if you have any other ideas to try before that let me know.
 
Another day another problem. Now 2 games don't seem to be working right. 1942 has wierd graphical issues for instance the white waves aren't showing up. I'm only getting a blue screen with the planes.

TMNT 2 will lock up halfway through the first level and has done it several times now. Seems to only happen on 2 player mode? Any suggestions?
 
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