Quoted from HydrogenHuman:As an additional note to anyone who may not know this about LED displays, remember to remove the fuses from the high voltage section of the power supply! Specifically, for System 11C machines, you will want to remove Fuse F1, F2, and F3. I have a new power supply from PinballPCB, but I believe the fuses would be the same as on an original power supply.
By removing these fuses, you protect the low voltage LED display from getting a potential surge and frying it.
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Correct on the fuse(s) According to Brett at Xpin he also recommends the fuse removal & said Williams overkilled the fusing. If I understood correctly F1 is the main fuse that feeds F2 & F3 (each display) On my game I only removed F1 & all is fine using Xpin green displays.