DescriptionThis video provides step-by-step instructions for replacing the noise filter on Whirlpool microwaves. The most common reason for replacing the noise filter is when electrical interference from outside the microwave makes the fuse inside the filter blow.
All of the information in this noise filter replacement video is applicable to the following brands: Whirlpool
Tools used: Phillips head screwdriver, insulated screwdriver
Step-By-Step Instructions1
Because of the high voltage and high current used by microwave ovens, be aware that repairing this appliance poses a substantial risk for injury or death if precautions are not taken. You should always unplug the microwave before you attempt any disassembly.
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Since high voltage capacitors used in microwaves may retain a charge even after the microwave has been unplugged, we recommend that only experienced professionals access and replace internal components. To replace the noise filter board in your microwave oven, you will need to uninstall the appliance. This will require two people.
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Have an assistant support the microwave while you remove the mounting bolts from the upper cabinet.
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Carefully tilt the microwave down and pull the power cord through the hole in the cabinet.
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Now, lift the microwave off the rear mounting bracket and set it on a sturdy surface, resting on a towel or blanket.
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Unthread the screws securing the grill.
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Pull the grill forward from the top to remove.
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If still in place, remove the glass turntable and support.
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Now tip the microwave so it rests on its back panel and remove the bottom panel by using a phillips-head screwdriver to unthread the mounting screws.
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With the screws removed, detach the panel and disconnect the wire harness.
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Detach the grommet from the frame and pull the wire free.
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Note the orientation of the turntable motor wires then slide off the insulators.
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Depress the locking tabs to disconnect the wires and you can fully remove the bottom panel.
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Return the microwave to its upright position and remove all of the screws securing the cabinet.
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Unthread the screws securing the blower cover and remove the cover.
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You can now fully remove the cabinet.
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You should release the potentially stored electrical charge in the capacitor to avoid injury.
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You can do this by placing a screwdriver with an insulated handle across each set of terminals.
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Be very careful not to touch the screwdriver blade when doing this.
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Note the orientation of the noise filter board wires then disconnect them.
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You will need to depress the locking tabs to detach the small wires.
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Remove the screw and washer to release the grounding wire.
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Unthread the mounting screw.
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Lift the old board up and slide it out.
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Install the new noise filter board by sliding it into place in the bracket.
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Secure it with the mounting screw.
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Secure the grounding wire with the screw and washer.
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Now connect the wires to the appropriate terminals on the new board.
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Make sure the power cord is secured then reposition the cabinet by aligning the top edge first.
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Push the sides forward making sure the tabs on the sides of the cabinet align with the frame.
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Replace the screws to secure the cabinet.
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Reposition the blower cover and secure it with the screws.
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Rest the microwave on its back panel.
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Replace the bottom panel by first reconnecting the turntable motor wires to the appropriate terminals.
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Slide the insulators over the terminals.
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Align the wire in the frame and secure it with the grommet then reconnect the wire harness.
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Fully reposition the bottom panel and secure it with the screws.
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Return the microwave to its upright position.
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Realign the grill and snap it into place then rethread the screws to secure.
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Now carefully reposition the microwave on the mounting bracket by hooking the back edge of the appliance on the bracket tabs.
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Insert the power cord through the hole in the upper cabinet.
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Lift the microwave up and secure the mounting bolts.
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Plug the power cord back in.
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Replace the turntable and support and your microwave oven should be ready for use.