721-80039700 Parts

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Genuine Lg part

Microwave Door Switch

By: Lg

Part Number: 3B73362F

The Microwave Door Switch is an OEM replacement part for LG countertop microwaves. It monitors the door position electrically to prevent unsafe oven operation if ajar.

Symptoms of a bad door switch include:

Inability to start or pause a cooking cycle unless securely latched
Error messages about the door being open
Inconsistent detection of open/closed door positions
Unreliable contact functioning after extended use

Causes involve normal wear of electrical contacts and internals through many open/close uses. Exposure to moisture intrusion from spills may potentially damage sensitive switch circuitry over time as well.

This genuine LG replacement switch is also compatible with Sears/Kenmore microwaves.

This part fixes the following symptoms

No heat
Won't start
shuts off after a few seconds

Do-It-Yourself Stories from Customers like You Interior light and turntable failed at the same moment. Stacey B. • New Bern , NC • February 01, 2021

Knowing the odds of 2 failures occurring at the same exact time was unusually high, I just searched your site for what other broken items might affect these two failures. Came up with next control item upstream and tallied that item failure with percentages of successful repairs, (4 mins.) door safety switch. Since I had to change out the most likely of the 3 and since I was already was going to be into the switch panel I ordered all 3 and swapped them all out to cover my butt, as they were... Read more

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Time Delay Fuse

5.0 (21)

By: Lg

Part Number: 3B74133Q

The Time Delay Fuse is an OEM part for LG microwaves. This fuse provides a safety mechanism by delaying the flow of electricity, protecting the microwave's electrical components from power surges and ensuring the appliance operates safely. It helps to prevent immediate damage in the event of a power surge or electrical fault, thus prolonging the lifespan of the microwave.

Over time, the time delay fuse can become damaged due to electrical surges, wear and tear, or faulty connections. If the fuse blows, it can disrupt the microwave’s ability to function correctly.

Symptoms of a bad time delay fuse include:

The microwave not turning on
No response from the microwave control panel
The microwave stopping unexpectedly during operation
Electrical issues or blown circuits in the microwave

This OEM LG part is also compatible with Sears/Kenmore models.

This part fixes the following symptoms

Won't start

Do-It-Yourself Stories from Customers like You Lg microwave oven did a loud pop and quit working Stephen C. • Cape Coral , FL • March 18, 2015

Called AppliancePartsPros because of good experiencing diagnosing problem with a dishwasher repair. We definitely are modest income amateurs! Same excellent response to our questions. Three possible causes. Used easy search menu to fine replacement parts. Bought all three, knowing that if all not needed, the others could be returned (within 365 days) for refund. Replaced the capacitor successfully after calling to get more help with a couple of places where we got stuck. Oven now works... Read more

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Damper Bracket

4.8 (10)

By: Lg

Part Number: 4810W1A151A

The Damper Bracket is an OEM component for LG microwaves. Located inside the microwave cavity above the wave stirrer, this bracket holds the position of the damper assembly that helps distribute heat evenly during cooking. The bracket measures approximately 12” by 5”.

Symptoms of a bad damper bracket can include:

Hot or cold spots developing within the microwave cavity
Looseness in the damper assembly fit
Reduced heat circulation leading to uneven cooking

Causes typically consist of cracking over long-term heat exposure. Repeated opening/closing of the damper may also weaken attachment points on the bracket.

This OEM LG part is also compatible with Sears/Kenmore microwaves.

Do-It-Yourself Stories from Customers like You Incorrect parts given to me upon purchase of appliance Marnie S. • Kennewick , WA • March 08, 2018

Needed installation parts. I ordered the parts from the company I purchased the appliances from. A week went by and no parts, called, emailed and called again to find out when the parts would arrive to be able to Re-schedule the installation. After the run around, I found AppliancePartsPros website and placed my order with them. I received the parts I needed within the time they promised. I was able to schedule my installation to enjoy my new appliance. It's been almost 4 weeks and still no... Read more

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Genuine Lg part

Damper

4.8 (10)

By: Lg

Part Number: 4900W1A001B

The Damper is an OEM component for LG microwaves. Located within the cooking cavity, it regulates airflow and safely vents steam escaping heated foods.

Causes of a faulty damper can involve standard wear and exposure accepting steam and condensation release. Food or liquid particles drying within tracks also threaten eventual adhesion issues restricting travel if left unaddressed between cleanings.

Symptoms of a damaged or defective damper include:

Inability to adequately vent excess moisture from heating
Potential messes spilling beyond the microwave frame
Grating sounds or squeaks emitting during cooking
Flaps possibly stuck inhibiting steam circulation

This damper is also compatible with Kenmore microwaves as well.

Do-It-Yourself Stories from Customers like You Incorrect parts given to me upon purchase of appliance Marnie S. • Kennewick , WA • March 08, 2018

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Light Bulb

4.9 (44)

By: Lg

Part Number: 6912W1Z004B

The Light Bulb is an OEM part for LG microwaves. It provides illumination inside the microwave oven, allowing users to monitor the cooking process and check the condition of the food without opening the door.

Causes of a bad light bulb can include normal wear and tear, electrical surges, or damage due to impact or overheating. Over time, the filament inside the bulb can burn out, or the bulb itself can become loose or disconnected.

Symptoms of a bad light bulb include:

The microwave interior light not turning on
Flickering or dimming of the light
Intermittent lighting during operation

This OEM LG part is also compatible with Sears/Kenmore models.

This part fixes the following symptoms

broken bulb

Do-It-Yourself Stories from Customers like You Interior light and turntable failed at the same moment. Stacey B. • New Bern , NC • February 01, 2021

$12.54

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Door Latch Spring

5.0 (8)

By: Lg

Part Number: 4970WRA001G

The Door Latch Spring is a genuine OEM part for LG microwaves. As a key component of the microwave, the door latch spring is responsible for providing the tension needed to securely close and latch the microwave door. It works behind the scenes to ensure a tight seal when the door is shut.

Symptoms of a bad door latch spring include:

The microwave door not closing or latching properly
Gaps appearing around the door seal when shut
Difficulty opening and closing the door

Causes of a bad door latch spring can include wear and tear over time. Exposure to excessive door slamming can also place undue stress on the spring.

This genuine LG OEM replacement part is also compatible with Sears/Kenmore microwaves.

Do-It-Yourself Stories from Customers like You Lg microwave door would not latch closed Audrey S. • Rochester , NY • February 05, 2018

Ordered door latch part and new spring. You Tube video helped me identify what I needed. I tried the fix recommended and it didn't work so I ordered the parts. It took less than 5 minutes to switch out the old for the new. If the door doesn't latch, you can't run the microwave and it's key. It wasn't an expensive or hard fix to get my microwave up and running again. So pleased with AppliancePartsPros for having what I needed and being reasonable about pricing. Turnaround time was excellent! Read more

$9.02

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Glass Tray

5.0 (30)

By: Lg

Part Number: 1B71961H

The LG microwave glass tray is an OEM replacement part for LG countertop microwaves. Located inside the microwave cavity, the glass tray provides a flat, durable surface for cooking and heating food items. The tray measures about 13 inches in diameter.

Causes of a bad glass tray can include cracks or chips from impact damage, prolonged exposure to high heat levels, or chemical etching from acidic food spills.

Symptoms of a bad glass tray microwave include:

Cracks, chips, or breaks in the glass compromising structural integrity
Difficulty removing or placing the tray due to a poor sliding fit
Food particles or liquids seeping below the tray and needing cleaning
Visibility issues looking inside the microwave cavity

This OEM LG part is also compatible with Sears/Kenmore countertop microwave models.

Do-It-Yourself Stories from Customers like You Burnt out Kenmore microwave light. Timothy E. • Wilmington , DE • May 11, 2018

Pretty easy fix. Took out 7-8 screws to remove cover for access to light. 2 were security type screws so I had to run to the hardware store to buy a special screwdriver. One screw to remove the bulb. Read more

$38.95

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Magnetron

5.0 (15)

By: Lg

Part Number: 2B71165R

The Magnetron is an OEM part for LG microwaves. As the primary cooking mechanism, it generates microwave energy to heat and cook foods quickly.

Causes can be from normal wear and tear over years of use. Damage may also occur if the microwave interior is exposed to moisture, spills or debris.

Symptoms of a faulty magnetron include:

Slow or ineffective cooking
Hot or cold spots in cooked foods
Buzzing or humming noises emanating from inside the microwave

This OEM LG part is also compatible with some Kenmore models.

Do-It-Yourself Stories from Customers like You Above range microwave not heating at all Alan K. • Sunrise , FL • October 05, 2015

LG Help-line said probably a failed magnetron, but since out of warranty,referred me to an authorized LG repair service. They wanted $79.95 service call to come out & diagnose problem. I ordered replacement magnetron for less than cost of a service call, Plus the part was delivered next day! Works like new again. Happy wife = happy life! Notes for DYI-ers: 1.Be careful removing over the stove microwaves--get help,they are heavier than you think. 2.Unplug microwave for 48 hrs, carefully... Read more

$128.75

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Diode

5.0 (5)

By: Lg

Part Number: 6021W3B001V

The Diode is an OEM replacement part for LG countertop microwave models. Located internally on circuit boards regulating magnetron function, it precisely controls the electric current flow.

Causes of a bad diode involve thermal fatigue over time putting repetitive stress on sensitive semiconductor junctions. Microwave demands may accelerate failures.

Symptoms include:

Intermittent cooking or complete failure to energize the tube
Error codes appearing on the control panel display
Buzzing or humming noises emitting from internal circuitry

This OEM LG part is also compatible with Sears/Kenmore microwaves.

Do-It-Yourself Stories from Customers like You Our microwave made a "pop" sound and stopped working/ Daniel D. • Chesterfield , MO • September 12, 2020

I have a multimeter so I was able to check the fuse per website recommendations and it was blown. However, the capacitor on the microwave was also original so I elected to replace the capacitor, fuse, and the ground protect diode. The repair was very simple (making sure the capacitor was discharged before replacing) and the microwave is now up and running again. Excellent trade to buy $40 worth of parts rather than a new $400 microwave. One nit - Kenmore puts a screw in the back that... Read more

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Door Frame Assembly (Inner)

4.0 (1)

By: Lg

Part Number: 3213W1A049F

This is the inner door frame assembly for a microwave oven. It provides the structural support for the door's window, trim, handle, and latch so the door aligns and closes properly and the interlock switches engage.

Forms the inner structure of the microwave door and supports the window/screen, trim, and latch components
Helps maintain alignment so the door closes and latches securely
Replace if cracked, warped, or if mounting tabs are broken
Typical symptoms include a door that won't close or stay shut, "door" error messages, the unit not starting unless the door is pressed, or a loose/rattling door panel

What's included: 1 inner door frame assembly Install notes:

Disconnect power before servicing; if over-the-range, support or remove the microwave before working on the door
Use gloves/eye protection and watch for sharp edges
Photograph door stack-up; transfer existing glass, handle, choke/trim, hinges, and screws to the new frame
After reassembly, ensure the door closes squarely and that interlock switches engage before restoring power

Do-It-Yourself Stories from Customers like You Glass fell out of its retainers and plastic clips holding the frame assembly to the door broke off Steve C. • Caledonia , WI • September 23, 2015

Careful placement of new screws into the inside of the outer door that now hold the frame assembly to the door secured the frame assembly to the outer door. All of the other parts I bought and replaced were a waste of money. I figured since I had them I might as well install them anyways. Easier than sending them back since I had the whole thing apart anyways. The part I really needed was no longer available, the outside door. The glass reinstalled into the retainers in the door without a... Read more

$73.95

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Rotating Ring Assembly

5.0 (1)

By: Lg

Part Number: 5889W2A012F

Color: brown. Measures about 10 inches in diameter.

Do-It-Yourself Stories from Customers like You I needed a new rotating ring for my microwave Richard V. • Fishers , IN • January 03, 2026

No fix, just replace Read more

$24.95

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Mounting Plate (Microwave)

5.0 (2)

By: Lg

Part Number: 3300W0A030A

This mounting plate is a metal bracket used to secure the microwave chassis/components in the correct position. A worn or damaged plate can cause poor fitment, vibration, or noise during operation.

Provides a stable mounting surface for the designated microwave assembly
Helps reduce vibration and rattling noises
Restores proper alignment if the original plate is bent or broken
Commonly replaced when the original plate is damaged or missing

What's included: One mounting plate. Install notes:

Unplug the appliance and discharge the high-voltage capacitor before servicing a microwave
Use proper personal protective equipment; metal edges can be sharp
Note orientation and fastener locations before removal
Tighten mounting hardware evenly to avoid distortion

Do-It-Yourself Stories from Customers like You Missing mounting bracket and hardware. Stephen H. • Fort Myers , FL • January 01, 2021

Ordered it from you. Read more

$141.56

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Rivet Assembly (Microwave)

5.0 (3)

By: Lg

Part Number: 4051W3A001A

This rivet assembly fastens panels, brackets, or covers inside the microwave cabinet. Replacing a damaged or missing fastener restores a tight fit, reduces vibration noise, and keeps mounted components properly aligned.

Secures panels, brackets, or covers to the cabinet for a stable fit
Use when a rivet is cracked, missing, or no longer holds
Can help resolve rattling, buzzing, or loose panel movement
Maintains proper alignment and support of mounted parts

What's included: One rivet assembly. Install notes:

Disconnect power before servicing; support and remove over-the-range/built-in units for safe access.
Microwaves contain a high-voltage capacitor that can retain a dangerous charge—service should be performed by qualified personnel.
Reinstall using existing mounting holes; ensure the rivet is fully seated and secure.
Wear cut-resistant gloves and eye protection to avoid injury from sharp metal edges.

Do-It-Yourself Stories from Customers like You The top fan cover snapped off Eric T. • Lake Zurich , IL • April 11, 2015

The replacement parts fit very well. It took me about 2 minutes to fix. Read more

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Lamp Socket

5.0 (5)

By: Lg

Part Number: 6620G00007B

This replacement lamp socket holds the light bulb and provides a stable electrical connection so your appliance light works reliably. Replace a heat-damaged or loose socket to restore consistent illumination and help prevent flicker, arcing, and premature bulb failure.

Secures the bulb and connects it to power
Restores proper interior or work-area lighting
Addresses flickering, intermittent light, or bulbs failing early from poor contact
Replaces sockets that are cracked, melted, or discolored

What's included: 1 lamp socket

Disconnect power at the breaker or unplug before servicing
Allow the area to cool; wear gloves and safety glasses
Note wire positions and transfer one lead at a time to the new socket
If servicing a microwave, access only the lamp area per your model instructions; do not open the cabinet—internal components can retain high voltage

Do-It-Yourself Stories from Customers like You The light under our lg over the range microwave was not bright enough William W. • Alvarado , TX • April 26, 2016

Added an additional light socket to the existing reflector. Changed the original 40 watt incandescent bulb to two 5 watt LED bulbs. It's actually bright enough for my old eyes now. Read more

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Cooling Fan Assembly

5.0 (3)

By: Lg

Part Number: 5893W3A002D

This fan assembly moves air through the unit to cool internal components and maintain proper ventilation. Replacing a worn or seized fan restores correct airflow, helps prevent overheating, and reduces excessive noise from a failing motor or wheel.

Circulates cooling air across internal components to prevent overheating
Exhausts air through the vent/duct path for proper ventilation
Common symptoms: fan not running, weak airflow, or loud rattling/squealing
Unit may overheat or shut off during use when the fan fails

What's included: One fan assembly Install notes:

Disconnect power before service; microwaves contain a high-voltage capacitor that can retain a dangerous charge—follow proper safety procedures.
Remove access panels to reach the fan housing; note airflow direction and wire orientation.
Transfer any brackets, grommets, or screws from the original assembly if required.
After installation, verify the wheel spins freely and airflow direction is correct before reassembly.

Do-It-Yourself Stories from Customers like You Melted cover fan John P. • Silverdale , WA • May 06, 2017

Replacement pieces Read more

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Kit Assembly

4.7 (3)

By: Lg

Part Number: 3861W1A043C

Do-It-Yourself Stories from Customers like You Missing mounting bracket and hardware. Stephen H. • Fort Myers , FL • January 01, 2021

Ordered it from you. Read more

$41.23

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721-80039700 Parts

Microwave Door Switch

Time Delay Fuse

Damper Bracket

Damper

Light Bulb

Door Latch Spring

Glass Tray

Magnetron

Diode

Door Frame Assembly (Inner)

Rotating Ring Assembly

Mounting Plate (Microwave)

Rivet Assembly (Microwave)

Lamp Socket

Cooling Fan Assembly

Kit Assembly