Mario Bros. will not boot

Gump79

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Oct 22, 2010
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Williamsville, New York
I just picked up a Mario wide body with a PCB issue. When powered on I get random sounds and 0's all over the screen. I checked voltages at the board connector, swapped out CPU's, and reseated all the roms to start and still the same issue. When I hold down the service switch it won't go into test mode at all. Any idea's??

 
Check voltage on the board and the IC chip voltages. Also if you have access verify your roms using an eprom programmer.
 
Yep.. looks like a program ROM access issue on the CPU PCB. Could be the roms themselves or the logic that surrounds it.
 
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