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Stuck button on Neo Geo MVS MV1C


lavalyte

Question

I have a MV1C board that always a shows a stuck P1 D button.

I can see no issue on the board in terms of shorts.

I have replaced the resistor array at the front right (facing the JAMMA edge) but no change.

 

Did I replace the wrong array or what other options are there?

 

John

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Do you have a logic probe? is the pin corresponding to the P1 D stuck low? If it is it could be the IC directly connected to the input. The schematics are pretty bad so I can't identify the location of the chip without having the board in front of me.

Also check the joystick ports make sure there are no bent touching pins.

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