Customer Ratings & Reviews

Hi there, ColmM. Thank you for sharing your experience with us. We understand your inquiry regarding the LG LMV1764ST over-the-range microwave and how the magnetron stopped working after four years of use. When a unit powers on but no longer heats, one of the first checks you can perform—if you’re comfortable with basic electrical diagnostics—is to verify the continuity of the thermal fuse and the high-voltage diode. After unplugging the microwave and ensuring power is off at the breaker, carefully remove the outer cover and use a multimeter to test the thermal fuse and diode. A blown thermal fuse or a shorted diode can mimic a magnetron failure and may be a less expensive fix. However, accessing and testing these components does require caution and some technical skill, so if you’re not experienced with microwave internals, we recommend having a qualified technician verify these parts for you.

If the thermal fuse and diode check out normally, it usually means the magnetron itself needs replacement. While the magnetron part may be covered under LG’s limited warranty, labor and service fees would be the customer’s responsibility. We understand that paying a technician to replace a magnetron in a $280-value microwave can feel cost-prohibitive. As a next step, we encourage you to send us a private message on Social Media @LGUSSupport with your unit’s serial number and purchase details. Our team can review your warranty coverage, provide an estimate for local in-home service, and let you know if there are any current promotions or options for reducing your out-of-pocket costs.

In the meantime, please also confirm that your microwave is connected to a dedicated 120 V circuit with a properly grounded outlet. Occasional power fluctuations or loose connections can sometimes cause unusual behavior in over-the-range units. Ensuring the outlet and circuit breaker are stable can help prevent further issues with heating elements or electronics.
https://www.bestbuy.com/site/lg-1-7-cu-ft-over-the-range-microwave-with-easyclean-stainless-steel/6413172.p?skuId=6413172
We appreciate your feedback and want to ensure you have the information needed to make the best decision for your kitchen needs. If you have any additional questions about troubleshooting, warranty terms, or local service options, please let us know via private message. We’re here to help you find the most cost-effective solution. —Renzo

Hi, Lisa. Thank you for sharing your experience with us regarding your LG Microwave (LMV1764ST) model. We understand that having a circuit board failure so soon after purchase is frustrating, especially when repair costs are close to the price of a new unit. In the meantime, to obtain more information, you may visit https://www.lg.com/us/support/help-library/lg-microwave-oven-troubleshooting-no-power-issue--1429709038316.

As a troubleshooting step, we recommend checking if the microwave is still under warranty, as certain repairs may be covered. If you'd like assistance with that, feel free to reach out, and we can guide you through the process.

Please send us a private message on social media @LGUSSupport, and our team will be happy to further assist you. We appreciate your feedback and look forward to helping resolve this issue. ^Juvy