What are common problems with LG microwaves?

Common problems with LG microwaves include electronic control issues, door latch failures, and heating problems. The most reported issue is microwave not heating or heating unevenly, where the microwave runs, turntable turns, but food stays cold, usually caused by failed magnetron, which is the tube that generates microwaves, failed high-voltage diode, or failed door switches that prevent magnetron activation. Magnetron replacement costs 150 to 250 dollars, often more than a new countertop unit. Second, door latch and door switch failure where door does not latch firmly or switches do not register closure, causing microwave to not start or stop mid-cycle, often due to worn plastic latch hooks. Third, control panel and touchpad not responding where buttons require hard presses or do not respond, especially after 4 to 6 years, due to membrane switch wear or moisture entering panel from steam. Fourth, turntable not rotating due to failed turntable motor or coupler, costing 20 to 40 dollars for part. Fifth, sparking or arcing inside cavity due to damaged waveguide cover, which is the small mica or plastic cover inside cavity that can burn from food splatter, or peeling paint exposing metal. Sixth, loud buzzing or humming noise from failing magnetron or high-voltage transformer. Seventh, vent fan not working on over-the-range models due to failed fan motor. Regular cleaning of interior and waveguide cover and avoiding slamming door prevents many issues.