• ** 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

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ME18H704SFS Samsung microwave hums when door is closed


Premium Member
Sep 4, 2017
Aurora CO
Model Number
Hello, microware manufactured Sept 2015. Started shutting down due to heat from pots and pans on stovetop. Now microwave cooks food when plugged in and door is shut, no lights or turntable. I can also cook food with door closed through normal operation.

So when plugged in and door closed, magnetron is active. I've tested all 3 door switches, all 3 are OK.
Thermostats seem ok as well, I think:

1507 KSD-140LC 0 = closed
1507 KSD-40LC 70 = open
1507 KSD-120LC 0 = closed

Anything else I can test?

Thank you!
There's a short somewhere on the main control board:
DE92-03624B Assy Pcb MAIN
Thanks for the reply, I was thinking the same, either a short or a faulty relay. Things went from bad to worse, microwave tripped my 20A breaker and now no longer runs at all!
This Samsung is a lemon, and with labor day sales, its worth getting a new microwave as we were never happy with the Samsung...

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