Monkey bizzness board issue

Jtoney

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I have this prize machine and I'll say that I have contacted Coast to Coast and they have informed me that they do not assist in determining what's going on. They also do not provide schematics and the guy basically said I was on my own.

I can verify that I have 5.1 volts going to the board. I have a brand new power supply that was purchased just for testing this machine. I got my logic probe out as well so between that and the multimeter I am testing everything that I can. Every single chip is getting the correct voltage 5 volts but I'm getting no logic anywhere. This means that the LED screens, they are eight statement displays and it's inside the cabinet, either comes on and shows garbage or it doesn't come on at all.

I went ahead and changed out a couple of capacitors. And I also have a tc1 so I can test some components. I just don't know what else to try on here to figure out why logic isn't working. Nothing has anything happening it's all dumb.
 

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I also have a monkey business board with issues that I have been working on. Mine doesn't recognize credits.

Do you see any clock signals anywhere?

FWIW Pipeline games sells replacement boards for $375.
 
No clock signal. All the chips I believe are being held in reset.
 
Is there any activity at the crystal? It is on that weird daughter board that plugs into the chip socket. I haven't had an issue with that setup but it always looked to me to be a likely failure point.
 
Can you check the crystal while in circuit? If not how do you check it? I was told I need an oscilloscope but I don't have one.
 
You'll need to check it with the board powered up. A scope would work but I would think a logic probe on some of the circuits right around the crystal would work too. I'm not sure what the frequency of the crystal is, it may be too quick for a logic probe to react. Here again, if we had schematics we would know but there's none to be had so I am just guessing here.
 
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