Mortal Kombat 3 Help

Hobbs2k14

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Donor 2014
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hey guys - I am restoring a Mortal Kombat 3 cabinet that has a brand new WG k7400 inside. The game boots fine and passes all test but there are weird graphic anomalies.

Thought maybe the monitor was a problem or the game board but then I ran across a you tube post from a guy with a UMK3 board and the exact same issue.

https://www.youtube.com/watch?v=feRg15Walzg

Note: I am not using a converter of any type like he is but getting the same issue.

Any help or advise would be very much appreciated. Thanks guys!
 
first question, did the board have the plastic mounting feet in the corners? if it didn't, it could very well explain your problem. the component legs on the solder side are very long, and without the feet they can get smashed flat and potentially touch other components.

in fact, regardless if it had feet or not, just look at the underside of the board and see if any legs are touching. that's the first place to start.
 
It did not come with the feet and its attached to the cabinet without them. I will have a look at that when I go home tonight. I figured at first that it must be my board but when I saw the youtube vid with the same issue I was like "now that's weird!" Especially the white rainbow pattern of dots against that one attract mode screen.
 
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After messing with this for quite a while the only thing that worked was putting all the Roms in another board.
 
The 8 ram chips at the bottom right of the board are notorious for causing issues like this. They can register as good/green, but still cause issues like yours. I have fixed problems like yours in the past by simply reflowing all of the ram chips. Look very closely at them and see if you can find any legs that aren't touching the solder pads.
 
Appreciate the advice. I have looked to see if there was anything with the ram chips that stood out but could not find anything. To make things even stranger I have another board that I was using for nba hangtime that flashes blue on the whole screen at certain parts of the game. I havent been able to fix that either :-(
 
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