Punchout monitor issues

Radford119

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Donor 2011, 2023
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I am having some issue with my PO and was hoping someone might be able to point me in the right direction. The problem is the bottom monitor signal is always really red and has no green and the top monitor signal is always slightly green.

Things I have done so far:

1. Recapped both monitors and tested them using a DK PCB prior to install, worked flawlessly.
2. Tried running without the filter board on the PCB.
3. Swapped monitor signals from the top to the bottom, problems follows the monitor signal and are not isolated to the monitor.
4. Tweaked RGB on the monitor inverter board.
5. Ran video signal without the inverter board.
6. Tweaked the R-Drive and R-Bias to no avail.

I have no ideo on where to go from here. I am running a switching power supply at the moment because I do not have the correct power supply harness, I am not sure if this is an issue but I thought I would throw it out there. The pinout shows 24v but I am under the assumption that it is only for the coin counter.

Any help would be greatly appreciated, next I am gonna check the harness at the edge connector for broken connections or problems. Thanks guys.
 

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Sounds like bad color proms.

That is a great idea, I am about to run out and reseat them to see if that makes a difference. Do you know what PROMs control the top monitor and which ones control the bottom? Thanks again for the help.
 
Thanks again man, I just contacted steph to get the ball rolling.
 
Just an FYI......there's several different "sets" of PROMs that work in conjuction with the ROMs. They are not interchangeable!

Edward

Thanks for the heads up man. I am gonna pull them here in a few and clean the pins and reflow the solder on the sockets to see if that helps.
 
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