It is usually located right next to the high-voltage capacitor. BE CAREFUL! YOU ARE TREADING IN VERY DANGEROUS TERRITORY! MAKE SURE THE MICROWAVE OVEN IS UNPLUGGED AND WAIT 5 OR MORE MINUTES BEFORE YOU GO POKING AROUND IN THERE. Note: In some older microwave ovens, those with a vertically-mounted squirrel-cage cooling fan, the HV diode was located inside the fan housing.
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SOURCE: Whirlpool microwave mh7140xfq
Curious, but did you know the diode was shorted without measuring it before you ordered the new one? I hope that's the problem.
In any case, there
should also be a "mini-manual" (tech sheet) hidden inside the unit behind the
control panel or hidden on the left side behind the grille, which is very helpful
when troubleshooting & testing.
It usually has a perspective view drawing showing the relative locations of the components (parts layout).
If you don't have your tech sheet, you can find it online here and look on pages 3 & 4.
The diode (rectifier) is connected to one terminal of the high voltage
capacitor and the other end goes to the chassis for ground.
It is located behind the magnetron in the back of the unit. You'll probably have to take the oven down from the wall to get to it safely.
Whirlpool customer service is here and you can also enter your model number on that page to download your owner's manual, installation instructions, etc.
Please read & heed the safety info in the tech sheet.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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