Norman W Port Charlotte , FL March 05, 2016 Appliance: LG Microwave Oven LMVH1750ST The number 3 and 9 did not work on our microwave I looked up the model number of the microwave. Went to the Q&A area stated the problem and they came up with the replacement part. I ordered the part and installed it right after it was delivered. Works great, I labeled the wires that I had to disconnect, removed the touch pad unit and replaced the broken part, reassembled, plugged it back in and it worked fine. Thank you for your service. Norm West Read More... Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes Tools: Screwdrivers