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Litton Microwave light bulb not working

If your Litton microwave light bulb is not working, the light bulb itself is the most likely cause, especially if it is burned out. Replace the bulb first, or test a halogen lamp with a multimeter for continuity or in an identical socket. If the replacement bulb or lamp still does not light, inspect the light socket and wiring, then test the main control board to confirm it sends the correct voltage to the socket. A defective door switch, including the primary or secondary interlock switch, can also prevent the control board from recognizing whether the door is open or closed, so the microwave light may not turn on or its light button may not function. A failed control board is less common, followed by a defective micro switch, which can cause the same door-signal problem. Enter your model number to find the exact Litton microwave light replacement, socket, door switch, micro switch, or control board for your appliance. Replacing a bulb usually does not require cabinet access, but any repair that involves opening the outer cabinet requires caution because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work, and this repair may require a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Litton 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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02 - Litton 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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03 - Litton 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 - Litton 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 - Litton 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 - Litton 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 - Litton 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 Litton microwave light not working?
How do I test a Litton microwave bulb, light socket, or wiring?
Can a Litton microwave door switch cause the light bulb not to work?
Should I replace the Litton microwave control board if the light is still out?
How do I find the correct Litton microwave light bulb replacement?