Microwave interior light does not turn on when door opens or during cooking, but unit heats normally.

Safety: Unplug the microwave before attempting any lamp replacement. Do not remove the outer cabinet; many LG models provide lamp access from the front, side, or top.

Steps (general):

• Locate lamp access panel: Check the user manual. On many LG over-the-range microwaves, the lamp is accessible by removing a small panel on the bottom or front after removing screws.
• Replace lamp: Remove the old bulb (usually a 20–40W appliance bulb or halogen specific to LG). Install an identical type and wattage rated for microwave use.
• Reassemble and test: Reinstall the cover, plug in the microwave, and open the door to test the light.

If the new lamp does not work, the socket or control board lamp circuit may be faulty and requires professional service.