Determining whether a microwave magnetron is broken involves observing specific heating failures and performing resistance tests with a digital multimeter. Red flags include the microwave running normally with no heat, loud buzzing noises, or a burnt electrical odor during operation. 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 a short circuit to the metal housing or an open filament reading proves that you must replace the magnetron.
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