Microwave incandescent  light bulb, 40 Watt. * Special Note* Manufacture recommends unplugging microwave prior to replacing light bulb.

Light Bulb

Grease Filter

Charcoal filter. Measures approximately 5 1/2" x 5"

Charcoal Filter

Glass Tray

Dryer door switch assembly. If the dryer does not start then the door switch could be defective. This switch also replaces the two wire switch.

Door Switch

Glass Tray Support

Aluminum exterior grille, 25-3/4 X 15-1/2 inches

Vent Grille

Protect internal parts with this genuine OEM waveguide cover, part number 5304523276, for select Frigidaire Microwaves.

Waveguide Cover

Halogen G9 Light Bulb, 120 Volts 40 Watts 60 HZ

Halogen Lamp

Door Handle

image

Microwave not heating

Generate microwave energy with this replacement magnetron, part number 3B71077E, for select GE, Whirlpool, Kenmore, Goldstar, or LG Microwaves.

The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the magnetron burns out, the microwave won’t heat. The magnetron is not repairable—if the magnetron is burned out, you must replace it. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)

Microwave is sparking or arcing

If the microwave is sparking or arcing behind the waveguide cover in the oven cavity, you will likely see smoke or there will be a burning smell. The appliance's magnetron is one of the components that could be damaged and causing the sparking or arcing. Inspect the magnetron for burn marks or damage and replace if necessary.

Microwave is loud or noisy

The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. Under normal circumstances, the magnetron emits a low hum. However, if the magnetron is damaged or nearly burned out, it may begin emitting high-pitched sounds or growling noises. If the magnetron is noisy, this indicates that the magnetron is nearing the end of its life or might be defective. A defective high-voltage diode can also cause the magnetron to be loud. Before replacing the magnetron, first test the high voltage diode. If the diode is not defective, replace the magnetron. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)

Microwave is tripping circuit breaker

A microwave that is tripping a circuit breaker can be caused by a shorted magnetron. You can determine that a magnetron has shorted by contacting one multimeter lead to one of the magnetron's terminals and the other lead to the casing. If meter display indicates that electrical continuity is present between any of the terminals and the casing, the magnetron has shorted and will need to be replaced.

Microwave producing a burning smell

The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the magnetron burns out, it can produce a burning smell and the microwave won’t heat. The magnetron is not repairable—if the magnetron is burned out, you must replace it. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)

**We’re excited to be able to offer trade professionals like you substantial volume-based discounts. Our PRO pricing levels are based on your anticipated annual parts spend with us. If your actual monthly spending trends lower than anticipated, your discount may change.

Appliance Parts, Lawn Mower Parts, Heating & Cooling Parts. 365 day returns.

Sign up for your PRO account

Create your account for exclusive discounts and benefits, like:

Your One-Stop

Shop

Join Repair Clinic Pro to unlock technician pricing, same-day shipping, dedicated support, and exclusive benefits tailored for repair professionals.

PRO users get exclusive discounts and benefits, like:

This account is not eligible, please contact your customer service representative for any questions.

Unlock technician pricing and exclusive Pro benefits at Repair Clinic. Join free today.

Repair Clinic Pro

Repair Clinic Pro | Discounts & Benefits for Technicians

Your discounted pricing and other Pro benefits are now available.

Thank You for joining Repair Clinic Pro!

Return parts & products within 365 days of placing your order.

Adhesives & Sealants Parts

Appliance Adhesive & Sealant Parts

Air Filters

Air Filters for Home

Appliance Cleaners

Appliance Cleaners for Sale

Dishrack Parts

Dishrack Replacement Parts

Dryer Vents

Dryer Venting Parts

Equipment Covers

OPE, HVAC & Appliance Part Covers

Fuel Treatments

Fuel System Treatments

Hardware & Fasteners

Hardware and Fasteners Parts

Kitchen Appliance Accessories

Kitchen Accessories Parts

Washer & Dryer Accessories

Dryer and Washer Accessories

Light Bulb Parts

Light Bulb Fixture Parts

Oil & Lubricants

Oil and Lubricant Parts

Paint & Supplies

Touch Up Paint & Supplies

Power Cords Parts

Power Cord Repair Parts

Safety Equipment Parts

Safety Equipment Spare Parts

Testing Equipment Parts

Testing Appliance, OPE & HVAC Parts

Specialty Tools Parts

Specialty Tool Parts for Sale

Vacuum Attachments

Vacuum Attachment Parts

Water Filters & System Parts

Water Filter System Parts

Water Treatment Parts

Water Treatment System Parts

Wire & Connector Parts

OPE, HVAC & Appliance Wire & Connector Parts

Lawn Care Supplies

Yard Care Supplies

Heating & Cooling Supplies

HVAC Supplies

CHANNELLOCK Tools Parts

CHANNELLOCK Replacement Tools

Gas Cans & Nozzles

Nozzles & Gas Cans for Sale

Maintenance Repair Kits

Maintenance Appliance Repair Kits

OPE cleaners & Filters Parts

Outdoor Power Equipment Cleaners & Filters

Power Tools Parts

Power Tool Replacement Parts

Appliances

Refrigerator

Dryer

Range/Stove/Oven

Washing Machine

Dishwasher

Washer/Dryer Combo

Microwave

Freezer

Oven/Microwave Combo

Trash Compactor

Ice Machine

Range Vent Hood

Vacuum Cleaner

Garbage Disposer

Dehumidifier

Bath Fan

Carpet Cleaner

Water Filtration System

Hot Water Dispenser

Lawn & Garden

Small Engine

Lawn Mower

Snowblower

String Trimmer

Pressure Washer

Chainsaw

Tiller

Leaf Blower

Wood Chipper

Hedge Trimmer

Generator

Log Splitter

Pole Pruner

Edger

Power Tools

Heating & Cooling

Furnace

Packaged Unit/RTU

Heat Pump

Central Air Conditioner

Air Conditioner

Air Handler

Water Heater

Humidifier

Unit Heater

Drill

Circular Saw

Miter Saw

Reciprocating Saw

Driver

Grinder

Jig Saw

Nailer & Stapler

Paint Sprayer

Planer & Joiner

Battery

Charger

Air Compressor

Wet/Dry Vacuum

Small Appliances

Blender

Whirlpool

Kenmore

Goldstar

Magnetron

Diode, Magnetron & Resistor

Microwave sparking or arcing? This video provides information on how to troubleshoot a microwave and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Microwave Sparking/Arcing — Microwave Troubleshooting

Is your microwave sparking or arcing? This video can help you discover the cause.

What Causes a Microwave to Spark and Arc?

Microwave loud/noisy? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Is Loud or Noisy  — Microwave Oven Troubleshooting

Oven/microwave combo sparking or arcing? This video provides information on how to troubleshoot an oven/microwave combo and the most likely defective parts associated with this problem. Commonly replaced oven/microwave combo parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor Broil Element Bake Element Oven Control Board Thermostat

Oven/Microwave Combo Sparking/Arcing - Oven/Microwave Combo Troubleshooting

Microwave not heating? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Is Not Heating — Microwave Oven Troubleshooting

Microwave shuts off after a few seconds? This video provides information on how to troubleshoot a microwave and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Microwave Shuts Off After A Few Seconds — Microwave Troubleshooting

Microwave display not working? This video provides information on how to troubleshoot a microwave and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Microwave Display Not Working — Microwave Troubleshooting

Microwave turns on by itself? This video provides information on how to troubleshoot a microwave and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Microwave Turns On By Itself — Microwave Troubleshooting

Microwave door won't open? This video provides information on how to troubleshoot a microwave and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Microwave Door Won't Open — Microwave Troubleshooting

This video is a compilation of 5 different tips to help maintain and make sure your microwave is performing and working efficiently. Don't forget to like and comment on this video and subscribe to our channel!

5 Tips For Your Microwave - Tech Tips from Repair Clinic

This video recommends that viewers use steam from microwaved water to help clean the appliance. Don't forget to like and comment on this video and subscribe to our channel!

Boil Water in Your Microwave - Tech Tips from Repair Clinic

This video reminds viewers to replace the charcoal filter in their microwave. Don't forget to like and comment on this video and subscribe to our channel!

Replace Microwave Charcoal Filter - Tech Tips from Repair Clinic

This video recommends that viewers use a putty knife to remove microwave trim. Don't forget to like and comment on this video and subscribe to our channel!

Removing Microwave Trim - Tech Tips from Repair Clinic

Microwave not working? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Is Not Working — Microwave Oven Troubleshooting

Microwave turntable not turning? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Turntable Not Turning — Microwave Oven Troubleshooting

Microwave buttons not working? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Buttons Not Working — Microwave Oven Troubleshooting

Microwave light bulb not working? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Light Bulb Isn't Working  — Microwave Oven Troubleshooting

Microwave exhaust fan not working? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem. Commonly replaced microwave parts: Turntable Motor Touchpad Control Board Magnetron Diode Transformer Fan Motor

Top Reasons Microwave Exhaust Fan Not Working — Microwave Oven Troubleshooting

Microwave Magnetron 3B71077E

This part 3B71077E is compatible with:

Related Articles & Videos

Magnetron Customer Reviews

Common Problems Fixed by the Magnetron

Microwave is sparking or arcing

Microwave is loud or noisy

Microwave not heating

Microwave producing a burning smell

Microwave is tripping circuit breaker

About the Magnetron

Shop by Brands

Repair Help by Brands and Product Type

Talk With Us

Talk With Us