OK
High Voltage Component Noise / Partial Short
Microwave makes loud buzzing or humming noise during operation, louder than usual
Advertisements
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.
Advertisements
Possible Causes
Failing magnetron, Shorted or failing high-voltage diode, Saturating high-voltage transformer, Loose mounting of transformer or magnetron
How to Fix / Troubleshooting
Safety: Unplug the microwave if the noise is very loud or accompanied by burning smell.
- 1. Compare with normal: Some hum is normal, but a sudden increase or metallic buzzing is not.
- 2. Check for loose parts: With the unit unplugged, remove the cover and ensure the transformer and magnetron mounting bolts are tight.
- 3. Listen location: Briefly run the unit (cover installed) and listen to identify if the noise comes from the right side (transformer/magnetron) or fan area.
- 4. If noise is from high-voltage area: Stop using the microwave and arrange for professional service. The magnetron or high-voltage components likely need replacement.
Advertisements
Repair Difficulty
Hard
4/5
Advertisements