Question about LG LMVM1945 Microwave Oven
Just stopped working. No fan, lights. Won't allow you to enter cook time. Only thing working is the clock and 30 second quick cook button but even that is iffy.
What you said about the the clock leads me to suggest that you first unplug it for a few minutes then plug it back in. It may just need a good reset. If you don't have your owner's manual you can download one here: http://www.lge.com/support/manual.jsp The mention of odor concerns me. It may just be a bit of food or grease on the waveguide cover, which is a small sheet or panel on the wall or ceiling of the cooking cavity, but it may indicate the failure of a part in the high voltage section. You may have an intermittent door switch. You can see some of my other responses for info on how to get our important text file that helps you diagnose and repair door switches and gives important safety tips.
Posted on Dec 11, 2006
Unplug the oven and wait 3 minutes then plugit back in and check to see that it operates normally. Do not run the oven empty - place a cup of water in it. Let me know if this helps and thank you for using FixYa!
Posted on Mar 30, 2009
If the model number is correct, there is a 125V, 20 AMP line fuse inside the microwave. Its usually mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven, UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. I found this illustration at searspartsdirect.com based on the model number you listed this question under:
The line fuse is listed as item 8 (part number 3B74133K). There is a another fuse listed as item 2 (part number 3B72974C), but this is a thermal fuse for the fan motor.
You can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended. If you wish to order on line, use the part numbers to search by comparison as the model number you listed this question under is not available at all the websites I have provided. The parts, however, ARE listed.
If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.
NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. To answer your initial question, "yes", these ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find any of the internal fuses blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.
Posted on Apr 28, 2010
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