Build Your Own Arcade Controls Forum
Arcade Collecting => Restorations & repair => Topic started by: pborneman on August 27, 2020, 08:21:37 pm
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Hello all! New here and hoping you can help.
I inherited a super old and beat up super Mario brothers arcade the other day. It's an old Donkey Kong Jr. cabinet that was switched to the unisystem vs Super Mario Brothers. When I first got it I plugged it in and everything seemed to work (minus the sound). However, the plug was missing the ground so I replaced the end of the plug. After that it worked fine for a day and then suddenly stopped working.
When I turned it on the screen would just turn gray and nothing would work. I checked voltage at the game board and wasn't getting any voltage so I assumed it was the power supply. I upgraded the power supply and fired it up (without connecting the game board) and checked all the voltage and it was good and the monitor turned on. However, when I plugged the game board in the monitor just goes black and I have no picture. I checked the voltage at the game board and I was getting the appropriate 5v so I am not sure what else it could be at this point.
Can anyone help provide me suggestions?
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Are you sure all voltages and grounds are on the connectors, and they are put in the right way around? According to this pinout (https://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=pinout&page=VS_System.html).