Todd P Greeley , CO April 29, 2022 Appliance: Whirlpool Microwave Hood Combo WMH78019HZ0 Whirlpool Microwave Wmh78019hz0: Magnetron. How to replace Microwave High Voltage Capacitor. I researched the problem. Found the solution online and ordered parts from AppliancePartsPros.com. It only took a screwdriver to make the repair. The only confusion I had is my model of microwave had a double diode, and the one sent to me (by model number) was a single diode. I wasn't sure what to do, either install the new single one or put the old double unit in. I went with the new single diode, and it works fine. I don't know why the two differences, but it all worked out. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours