Lg Microwave MB-387W Parts

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Switch,Micro

By: Lg

Part Number: 6600W1K001Q

The Switch, Micro is an OEM part for LG microwaves. This micro switch is crucial for the operation of the microwave door mechanism, ensuring that the microwave only operates when the door is securely closed.

Causes of a bad micro switch can include wear and tear from frequent use, damage due to electrical faults, or physical impact that disrupts its functionality.

Symptoms of a bad micro switch include:

The microwave not starting or stopping unexpectedly
The door not latching properly
The microwave light not turning on or off correctly
Error messages appearing on the control panel

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

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

$10.95

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Microwave High Voltage Diode Assembly

4.9 (18)

By: Lg

Part Number: 6851W1A002E

Microwave not heating or making loud buzzing noise? The high voltage diode regulates power to the magnetron. DIY repair typically takes 30-45 minutes.

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

$16.95

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Microwave Turntable Motor

5.0 (24)

By: Lg

Part Number: 6549W1S011B

Turntable stopped turning or making noise? This microwave motor rotates the glass tray for even heating. Easy DIY fix with basic tools in under an hour.

This part fixes the following symptoms

Tray won't turn

Do-It-Yourself Stories from Customers like You Microwave turn table stopped rotating Thomas T. • Willow Grove , PA • September 08, 2015

I googled the make and model, and found the part on AppliancePartsPros.com. The underside of the oven has a metal grille with numerous openings of various shapes and sizes. There is a rectangle that is punched into this grille, just below the motor. I pried between the vent holes to snap the connections near the perimeter on the punched rectangle. I only did this on three sides. Then pry up the rectangle away from the connected side. Undid the hold down screw, separated the motor from the... Read more

$36.95

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Appliance Mounting Screw

5.0 (1)

By: Lg

Part Number: 4000W4A003A

Replacement screw for securing panels, brackets, and internal components. Restores tight fit and proper alignment when original hardware is stripped or missing.

Do-It-Yourself Stories from Customers like You AC fan motor. Tom C. • Liberty Lake , WA • September 26, 2021

Disassembled and replaced ac motor. The hardest part was to pull the microwave out of the cabinet. Read more

$10.58

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Microwave High-Voltage Capacitor

By: Lg

Part Number: 0CZZW1H004B

Microwave won't heat? A failing high-voltage capacitor disrupts the heating circuit. This part stores electrical energy for consistent operation.

$29.95

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Time Delay Fuse (Thermal Fuse), 1 Pack

5.0 (1)

By: Lg

Part Number: 3B74133C

This time delay fuse protects the appliance from overheating by opening the circuit when temperatures exceed safe limits. It's a direct-replacement electrical safety fuse used in heating circuits to help prevent damage and fire risk. What it does:

Opens the circuit when the detected temperature rises above safe operating limits to stop the heating element
Helps prevent overheating-related damage to internal components and wiring
Can cause intermittent or no heating when failed
Commonly associated with symptoms such as no heat, reduced or inconsistent heating, or a unit that stops running during heating cycles

What's included: One time delay fuse Install notes:

Disconnect power to the appliance before accessing or replacing the fuse to avoid electrical shock
Locate the fuse according to your appliance's service manual or diagram and replace with the exact part number
If the fuse is blown, inspect heating element, thermostat/thermal cutouts, and venting for underlying faults before reinstalling

This part fixes the following symptoms

Won't start

Do-It-Yourself Stories from Customers like You Thermostate (correct name is a thermister; 1 time over heat and reacts like a fuse) Paul J. • Parkville , MD • February 16, 2017

Actual problem was due to a poor connection from the circuit board and HV transformer, over time this poor / loose connection began to arc causing enough heat to physically melt the connector and the contact to the thermistor. the problem was obvious but I still followed procedures to check all the components.*** NOTE*** ALWAYS UNPLUG DEVICE FIRST, WITH MICROVAVES, ALWAYS, ALWAYS, DISCHARGE HV CAPICITOR, IT CAN KILL YOU! just take your time testing components, following your electronic... Read more

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Screw (Fastener)

By: Lg

Part Number: 4B70188C

This is a replacement screw used to secure appliance components and panels. It restores proper fastening where a stripped, missing, or damaged screw causes loose parts or rattling. What it does:

Fastens panels, trim, or internal components to maintain structural fit
Helps stop vibration-related noise from loose assemblies
Replaces missing or corroded screws that prevent proper closures
Restores secure mounting after repairs or disassembly

What's included: One screw Install notes:

Use the correct screwdriver or bit to avoid stripping the head
Tighten until snug—do not over-torque to prevent thread damage
Keep small parts away from children and pets
Disconnect power or water before accessing internal parts

$10.58

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Microwave Mounting Screw

By: Lg

Part Number: 1TTL0403818

Replacement mounting screw for microwave installation and assembly. Use when original screws are lost, stripped, or damaged during service or relocation.

$10.58

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Range Wire Harness Holder

By: Lg

Part Number: 4B72510F

This is a circular wire harness holder that secures and organizes internal wiring within the range. It clips onto the frame or mounting points to keep wires routed properly and away from heat sources. Replace this part if it is broken or missing, which can cause loose wiring or potential contact with hot surfaces.

$7.43