Patrick D Kokomo , IN April 22, 2017 Appliance: LG Microwave Oven LMV1813ST Lg Microwave Lmv1813st / : Plastic separation inside lg microwave door. How to replace Door Assembly. I dis-assembled the door to see how it broke and to see if there was a way I could repair it. It was not repairable and the specific part that was broken was not an available part for replacement. I ordered the complete door which was all that was available. It arrived in approx. 24 hrs as a result of Appliance Parts Pros always fast delivery. Replacing the door required removing the vent assy. above the door which was secured with 2 screws. Installing the new door just required lifting it into place and then replacing the vent assy. 4 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes