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LG Microwave light bulb not working

When an LG microwave light is not working, the light bulb itself is the most likely cause. A burned-out microwave light bulb is usually the simplest repair, so replace the bulb before testing other parts. Some LG models use a halogen lamp instead; test the lamp for electrical continuity with a multimeter or install it in an identical socket. If the bulb or halogen lamp is good, inspect the light socket and wiring, then test the main control board. The board should send the proper voltage to the light socket, and it may need replacement if voltage is missing or too low. A defective door switch can also keep the microwave light from turning on or prevent the light-control function from working. Test each door switch for continuity and replace any failed switch. The less common causes include a defective control board or micro switch. Enter your LG microwave model number to find the exact light bulb, halogen lamp, socket, switch, or control board for your appliance. If repair requires removing the outer cabinet, unplug the microwave first and use proper capacitor discharge procedures. The high-voltage capacitor can store a lethal charge even after unplugging, so have a qualified technician perform interior work if you are not familiar with safe discharge.

01 - LG Microwave Light Bulb

The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb
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Top Solution

02 - LG Microwave Halogen Lamp

To determine if a halogen lamp has failed, you can use a multimeter to test it for electrical continuity, or install the lamp into an identical socket to test it.
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Top Solution

03 - LG Microwave Main Control Board

Before replacing the control, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Highly Likely

04 - LG Microwave Door Switch

A defective door switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches do not have continuity, the switch or switches should be replaced.
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Highly Likely

05 - LG Microwave Control Board

A microwave light bulb not working could be caused by a defective control board, although this is rarely the case. Before replacing the control board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Common

06 - LG Microwave Micro Switch

A defective micro switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the micro switches are defective, use a multimeter to test each of the switches for continuity. If any of the micro switches do not have continuity, the switch or switches should be replaced.
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Common

07 - LG Microwave Power Supply Board

A microwave light bulb not working could be caused by a defective power supply board, although this is rarely the case. Before replacing the board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the power supply board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the board is not sending enough voltage to the light bulb socket, replace the board.
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Less Common

Frequently Asked Questions

Why is my LG microwave light bulb not working?
How do I test an LG microwave bulb or light socket?
Can a door switch cause the light in my LG microwave to stop working?
Should I replace the LG microwave control board if the light is out?
How do I find the correct LG microwave light bulb replacement?