Quoted from Cenobyte:So something else on the power board is malfunctioning,
You might have a shorted LED board. Start with WOZLED1, unplug the power connector to it and see if the LED for F2 lights up. If not try unplugging the larger LED boards one at a time to see if you turn up anything.
You do this with the power on, only unplug the power connector. Turn the game off before plugging the power connectors back on.
LTG : )