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Toshiba Microwave light bulb not working

If your Toshiba microwave light bulb is not working, the bulb itself is the most likely cause. A burned-out microwave light bulb can usually be fixed with a microwave light replacement, so replace the bulb before testing other parts. If your Toshiba model uses a halogen lamp, test the lamp for continuity with a multimeter or install it in an identical socket. Next, 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, secondary, or monitor switch, may fail to signal that the door is open or closed, leaving the microwave light off or preventing its light button from working. A separate control board or micro switch can cause the same symptom, although control board failure is less common. Enter your Toshiba microwave model number to find the exact replacement light bulb, halogen lamp, socket, switch, or control board for your appliance. If testing requires removing the outer cabinet, unplug the microwave first, but remember that the high-voltage capacitor can store a lethal charge even after power is disconnected. It must be properly discharged before interior work, so use a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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 - Toshiba 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

Frequently Asked Questions

Why is my Toshiba microwave light not working?
How do I replace the light bulb in my Toshiba microwave?
How can I test a Toshiba microwave light bulb, socket, or halogen lamp?
Can a Toshiba microwave door switch cause the light bulb not to work?
How do I find the correct Toshiba microwave light bulb replacement part?

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