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Sharp Microwave light bulb not working

When your Sharp microwave light is not working, start with the light bulb because a burned-out microwave light bulb is the most likely cause. Replace the bulb, or the halogen lamp if your model uses one, before replacing other parts. You can test a halogen lamp with a multimeter for continuity or try it in an identical socket. If a new bulb does not fix the problem, inspect the light socket and wiring, then test the main control board to see whether it sends the correct voltage to the socket. A defective door switch or micro switch can also prevent the cavity light from turning on by failing to signal the control board when the door opens or closes. The control board itself is a less common cause, but it may need replacement if the bulb, socket, wiring, and switches test properly. Enter your model number to find the exact Sharp microwave light bulb, halogen lamp, socket, door switch, or control board for your microwave. If any repair requires opening the outer cabinet, unplug the microwave first and use extreme caution. The high-voltage capacitor can store a lethal charge even after the microwave is unplugged and must be properly discharged. If you are not familiar with capacitor discharge procedures, hire a qualified technician.

01 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 - Sharp 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 Sharp microwave light bulb not working?
How do I replace a Sharp microwave light bulb?
How can I test a Sharp microwave door switch or micro switch for a light problem?
What should I check if the Sharp microwave light bulb, socket, and wiring are good?
How do I find the correct Sharp microwave light bulb replacement?