Gibson Microwave light bulb not working

If your Gibson microwave light bulb is not working, start with the bulb itself because a burned-out light is the most likely cause. Replace the light bulb before testing other parts. If your model uses a halogen lamp, test it for electrical continuity with a multimeter or install it in an identical socket. Next, inspect the light socket and wiring for damage or loose connections. If those parts are sound, the main control board may not be sending the correct voltage to the light bulb socket and may need testing or replacement. A defective door switch, including a primary or secondary switch, can also prevent the control board from recognizing whether the door is open or closed, while a failed micro switch may keep the light or its control button from functioning. Enter your model number to find the exact Gibson replacement light bulb, halogen lamp, socket, switch, or control board for your microwave. Any repair that requires opening the outer cabinet must be handled carefully because the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. Proper capacitor discharge is required before interior work, and a qualified technician should perform the repair if you are not familiar with that procedure.

01 - Gibson 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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02 - Gibson 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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03 - Gibson 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 - Gibson 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 - Gibson 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

06 - Gibson 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

07 - Gibson 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