LG Microwave: Making Loud Noise
Often a failing magnetron, a worn turntable motor, or a bad cooling fan. Add a photo of your LG Microwave in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Note what the noise sounds like and when it happens, then stop the microwave and switch off its breaker, or unplug it if the plug is dry and easy to reach.
Take a photo of the microwave and any code on the display, without opening anything.
Don’t use it again until it’s checked, and keep people away from it.
Everything else about this problem
Is it an emergency?
Is a loud noise from an LG microwave an emergency?
Usually not, but it can be. A grinding, rattling or humming that has just started most often comes from a fan, motor, belt or loose panel. Stop using it and cut the power if the noise comes with a burning smell, smoke or sparks.
Symptoms & causes
Loud grinding, buzzing, or rattling noises from your LG microwave often indicate a mechanical failure within the unit. A grinding sound typically points to a failing turntable motor or stirrer motor, while a loud hum or buzz can signal issues with the magnetron, high-voltage transformer, or cooling fan. These noises suggest internal components are struggling or loose, potentially leading to inefficient heating or complete operational failure if not addressed.
Tools & parts
You will need a basic screwdriver set (Phillips and flathead) to access the internal components of your LG microwave. A multimeter is essential for safely testing electrical continuity and voltage on parts like the high-voltage capacitor and magnetron. Specific replacement parts might include an LG turntable motor, a cooling fan, or a high-voltage diode depending on the identified issue.
Safety first
Always unplug your LG microwave from the wall outlet before attempting any inspection or repair to prevent electrical shock. The high-voltage capacitor inside can store a lethal charge even after the unit is unplugged, so it must be safely discharged using a properly insulated tool. Be cautious of sharp metal edges within the microwave casing and wear appropriate safety gloves to avoid cuts.
When to call a pro
If your LG microwave is emitting a loud, deep hum accompanied by no heating, it often indicates a failing magnetron or high-voltage transformer, which are dangerous and complex repairs best left to a certified technician. Persistent arcing or sparking inside the cavity, even after cleaning, suggests internal waveguide damage or a faulty magnetron that requires professional assessment. Any issues involving the main control board or complex wiring harnesses should also be handled by a qualified repair expert due to the specialized testing tools and knowledge required.
Questions people ask
Why is my LG microwave making a loud humming noise?
A loud humming noise in an LG microwave often points to a failing magnetron, which generates the microwaves, or a faulty high-voltage transformer. It could also be a struggling cooling fan or a loose component vibrating excessively.
What causes a grinding noise in an LG microwave?
A grinding noise typically indicates a problem with the turntable motor, which rotates the glass tray, or the stirrer motor located above the cavity. These motors can wear out or become obstructed, causing friction and noise.
Is it safe to use my LG microwave if it's making strange noises?
No, it is generally not safe to continue using an LG microwave that is making unusual or loud noises. Unplug the appliance immediately to prevent further damage or potential safety hazards like electrical arcing or fire. Continuing to operate it could exacerbate the problem or pose a risk.
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What it is, how urgent, who to call
Add a photo of your LG Microwave in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.