Determining whether a microwave magnetron tube is broken involves observing specific heating failures and performing resistance tests with a digital multimeter. Red flags include the microwave running normally with a spinning turntable and interior light but failing to heat food, loud buzzing transformer noises, or a burnt electrical odor. To test it, unplug the microwave, discharge the high-voltage capacitor, disconnect the magnetron terminals, and check resistance across the filament terminals with a multimeter set to ohms; it should read near zero. You can troubleshoot high-voltage parts safely. You can verify that your magnetron is broken when confirming an open filament reading or an internal short circuit to the metal housing proves you must replace the component.
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