• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake

GE JE1860WH04 1.8 cu. ft. Overheating smell when microwaving something longer that around 4 min

jeepman

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So the holder for the side of the last fuse that heated up enough to squirt out Solder is definitely showing signs of heating based on the discoloration. Also, the underside of the PCB shows a bit of heating.

Here are the photos.

20190818_184858.jpg 20190818_184822.jpg
 

Dan O.

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So the holder for the side of the last fuse that heated up enough to squirt out Solder is definitely showing signs of heating
I agree and there should be no reason for heat there.

I would suggest you start by replacing that noise filter/fuse holder # WB02X11250 and also a new fuse and see how it performs then. Many suppliers show the noise filter as out of stock so it might have to be ordered in.

Dan O.
 

jeepman

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Hmmmm, I am looking at the board, and I think I can refurbish it pretty easy. I need to get some new flux, but I am good on everything else needed to de-solder and replace the few components on the board. That assumes I don't run into component availability issues, or minimum quantities! I am not worried about it being multi-layer, so it should be a straightforward 2 hours.
 

rickgburton

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I wouldn't read too much into it. If this was a service call I would just pop in another fuse. To me the noise filter and fuse holder don't look bad enough to warrant replacement. I've replaced a lot of 20 amp ceramic fuses in microwaves and I've never seen one fail like that. It might just be a defective fuse. Just make sure the fuse fits tight in the fuse holder.
 

jeepman

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I have a buddy at work that has a Heat Gun I think. I will see if I can borrow it. I just want to see what temp the fuse reaches, and it if goes above 125C then I will be worried, because that is max operating temp per specs.
 

rickgburton

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Except that's not a thermal fuse. You would be better off taking an amp reading. The TCO on the mag tube is a thermal fuse. Look and see what temperature is on that part. In fact there are several TCO's in that machine that open between 150°F -275°F
 
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