Dennis Z Washington Township , NJ March 22, 2015 Appliance: LG Microwave Oven LMV1680ST Lg Microwave/Hood Combo Lmv1680st: Microwave was not heating. How to replace Microwave Door Switch. Replaced micro switch . The old switch had lost the internal red button connection. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours