Josh H Carmel , IN March 07, 2018 Appliance: LG Microwave Oven LMV2015ST Lg Microwave Lmv2015st / : Microwave not heating food. How to replace Cable Assembly. LG microwave would not heat food, but appeared to be working properly. Table would spin, lights would come on when opening door, timer accurately counted down, etc. Magnetron and diode were both bad. Replaced both parts and the microwave works perfectly now. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes