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It does not start up and have already replaced the control board

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Beffore the control board was replaced it was important to check that the power supply was correct. Hope the secondary/main transformer is working.if supply is not coming to the main board check the fuse and this sub transformer.
A check will indicate that the line is correct and the power comes to the board. If the board is not acitve then the front panel touch board could be faulty. Also check the main capacitor for the magnetron to function or the magnetron itself..
Hope you try this out.

Posted on Aug 25, 2010

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I can't find if there's a difference between model PLMV178HC and PLMV178HCA. Every search for PLMV178HC redirects me to PLMV178HCA. Unless there is grease or moisture on the control circuit board, then you have a shorting membrane keypad.
It is repaired by replacing the control panel frame assembly, which comes with a new membrane keypad already attached.

For model PLMV178HCA, that is part number 5304470533 and you can get it from Sears online for $89.95 (subject to change).

At my Web site, I have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes. (Also, the service manual is here.)

If you have any trouble getting the grille off once the screws are removed, slide the hood vent grille to the left about 1/4", then then pull it forward. On some models there are L-shaped clips that fit into a slot to hold bottom of the vent.

Be very careful when disconnecting the cables & wires. Some connectors have a locking tab (see photo) Next remove the keypad strip (see photo) Then simply move your circuit board into the new frame.

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http://www.MicrowaveControl.com
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Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.

Touchpad If the microwave buttons don't work the touchpad might be at fault. Generally speaking, if the dishwasher display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.

User Control and Display Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.
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Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.


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