Response from Jonathan: Mike,

Since you’ve tried a different board and you continue to have problems, it would seem that the problem is in your cabinet somewhere. I know you mentioned that you checked the power supply and everything was good but did you try checking the power at the harness? You can accomplish this by turning off the game, unplugging your board from the cabinet, turning the game back on and testing your voltage using the correct pins on your harness. Since Golden Tee 99 is a JAMMA game, you should be able to use these pinouts to determine the voltage pins. Make sure you adjust your power supply if your voltage is too high or too low. This should ensure that you are getting the correct voltage to the board. You can also check the voltage with the board hooked up by placing your multimeter probes just slightly below the corresponding voltage and ground pins. This second method should give you the most accurate reading of the voltage that your board is receiving.

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