The Microwave Noise Filter Board Reduces The Voltage In The Microwave To A More Usable Level So That The Appliance Operates Correctly. If Your Microwave Will Not Power On At All, This Part May Be Defective And Require Replacement. This Is An Accessory That Can Be Used Across Several Brands; Check To See If Your Model Number Is Compatible. Replacing This Accessory Will Require Basic Hand Tools, Complicated Disassembly Of The Microwave And Prior Repair Experience. Caution: There Is Risk Of Electrocution When Installing This Part. We Recommend That You Hire A Qualified Technician To Complete This Repair. If Installing Yourself, Remember To Unplug The Microwave Or Shut Off The House Circuit Breaker For The Appliance Before You Begin. Helpful Tip: You May Need Assistance Lifting And Removing The Microwave From Its Location Over The Range To Complete The Repair.