Response from Jonathan: Chris,

The power supply and monitor problems you are describing could be somewhat related. It might be a good idea to just replace the power supply as that could be contributing to the screen flashing issue. You should be able to get a replacement power supply from Suzo/Happ (I believe this is the one: http://na.suzohapp.com/all_catalogs/power_supplies/80-20167-0. Contact Suzo/Happ just to be sure.) or from any of the other retailers listed on our resources page under the Arcade Parts Suppliers & Distributors heading.

The missing green channel is probably a different problem altogether. More than likely there is either a problem in the input wiring that runs from the board to the monitor or with the monitor chassis itself. Start off by tracing the green wire that runs from the harness to your monitor chassis to see if it’s making a good connection. Since Killer Instinct 2 is a JAMMA game, you can use these JAMMA pinouts to find where the Video Green wire is on your harness. You can use the continuity check on your multimeter to see if the wire has any breaks in it. 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 green pin on the monitor chassis. These pins like to come loose sometimes especially after years of unplugging and plugging in the connector.

If the green input wire is making a good connection on both the harness and the monitor connector ends but the problem continues then you may have an issue with a color drive transistor. It could be that your green drive transistor has gone out on your monitor and needs to be replaced. Check out our post on Checking A Monitor Tube for information about color drive transistors. Of course, there could be other things causing this problem but this information should give you a good starting point.

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