Response from Jonathan: Johnny,

There are several different things that can cause color issues like this. For one, you might try checking the input wiring that runs from the Area 51 board to the monitor chassis itself. Start off by tracing the wires that run from the harness to your monitor chassis to see if they are making a good connection. Since your Area 51 board uses the JAMMA standard, you can check out our JAMMA wiring harness diagram to find where the video color wires are on your harness. You can use the continuity check on your multimeter to see if the wires have any breaks in them. Check out our post on Checking Fuses With A Multimeter for more information about continuity. If the wire is making a good connection, you might try touching up the solder on the back of the input pins on the monitor chassis. These pins like to come loose sometimes especially after years of unplugging and plugging in the connector.

If all the input wires are making a good connection on both the harness and the monitor connector ends but the problem continues then you could indeed have an issue with the color drive transistors (as you mentioned). It could be that your red and green drive transistors are acting up on your monitor and needs to be replaced. This would explain the overabundance of blue on your screen. Of course, it could also be that the red/green guns on your tube are not working properly. Check out our post on Checking A Monitor Tube for more information about both of these issues.

Hope that helps. Thank you for your question and good luck with your repair.