Privileg High-Voltage Component Short or Overload

Microwave makes loud buzzing or humming noise when running, louder than usual, with little or no heating.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted high-voltage diode,Shorted magnetron,Partially shorted high-voltage transformer,Arcing in waveguide

How to Fix / Troubleshooting

Safety warning: Unplug the microwave immediately if you hear unusually loud buzzing, smell burning, or see smoke.

User-level checks:

  • 1. Inspect the cavity: Look for metal objects, damaged waveguide cover, or burned spots inside the cavity. Remove any foreign objects.
  • 2. Check the waveguide cover: If the mica or plastic cover on the side wall is burned or charred, do not use the microwave until it is replaced.

Technician-level checks:

  • Inspect the waveguide and magnetron antenna for arcing damage.
  • Test the high-voltage diode, capacitor, and magnetron for shorts.
  • Replace damaged components and the waveguide cover.

Note: Continued use with this symptom can cause severe damage and fire risk.

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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Diode
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