Help identifying a burnt resistor WB27X10438

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A user sought help identifying a burnt resistor on their GE Spacemaker XL1800 microwave's PCB, part number WB27X10438. They struggled to determine the resistor's color bands and shared links to similar boards on eBay for reference. After measuring the resistor, they found a reading of approximately 30k ohms, leading to discussions about potential replacements and the importance of investigating other components that may have caused the failure. Ultimately, the user successfully replaced the resistor with a 28.7k ohm component, and the microwave began functioning properly again. The conversation highlighted the need for caution and thorough diagnostics when dealing with electronic repairs.
  • #31
jcy110 said:
I just fixed my GE Microwave XL 1800 for $2.95. I purchased the 1/4W, 30k Ohm resistor and a 220uf 50V capacitor. Soldered them in, put the WB27X10438 control
board back into the unit and it works perfectly. The large black power relay is not manufactured anymore so I figured I would replace the capacitor and resistor, if that didn't work I would have to spring 150-160 for a new power control board.

View attachment 189655

View attachment 189656

jcy110, I believe I have the same problem as you with the WB27X10438 board. What caused you to replace the 220uf 50V capacitor in addition to the resistor? All thread I've read (on this site and others) indicate the resistor as a source of the problem, but not the capacitor. thanks
 
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  • #32
Sgib, as you can see in my pics on page 1, the cap is starting to bulge, that is why I replaced it. For a total of like 3.00 its worth the work.
 
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