The lights and clock on my LG LMV1813ST model work and the timer counts all the way down but the turntable does not work and there is no power. Any suggestions??

Terence Fourie

• 909 Answers
• Posted on Oct 13, 2009

SOURCE: hello. I have an LG over-the range microwave.

You need to replace the magnatron and the HV diode. Replacing the capacitor is also an advantage.

SOURCE: microwave wont heat up

Your signs point to a failed power tube. First though, does it defrost? If it does it is an electrical control problem. If it does not defrost, do the following.... With the power unpluged you may want to remove the outer cover, ( screws at back ), and locate a shiney metal box. That box is shielding for the power tube. Get the part # from the tube and replace. You could check price and availability at www.avnet.com . Make sure you replace all of the shielding exactly the way you found it. VERY VERY IMPORTANT!!!!!

SOURCE: not cooking

HI. Your symptoms are a strong indication Magnetron failure. This is the principal heating device, that is used to produce microwaves that , essentially, excite the water molecules in the food, thus, producing the heating effect. When this device fails, generally, the unit will run, but not heat. This device is very fragile, and can injure you if you are not qualified to handle this type of component. There is a High Voltage Capacitor, that is used to help provide the necessary current for optimal Magnetron operation. This capacitor must be discharged correctly. If not, you could risk serious injury, during the repair, if it is accidental touched.

The Magnetron is linked to a cut-off fuse. If the magnetron becomes unstable, this fuse will shut the device down. It is standard procedure to have this fuse test for continuity. If the fuse has blown, this will be the culprit. Replace the fuse. Now, if the fuse continues to show continuity, this will confirm that the Magnetron has failed. I would advise to inspect the Capacitor, and HV diode for visible burn marks, or swollen top(Cap).

Access can be ac hived to these parts by removing the outside cabinet screws. Once the screws are removed, the cover can be removed, as well. Once the cover is removed, the internal components will be exposed for testing, and visual inspections.

WARNING: IF YOU ARE NOT A QUALIFIED SERVICE TECH, THIS WILL NOT BE A NOVICE DO IT YOURSELF JOB. MICROWAVES ARE VERY DANGEROUS, AND CAN CAUSE SERIOUS INJURY. I RECOMMEND TO CALL FOR SERVICE, IF YOU ARE UNCOMFORTABLE WITH HANDLING THE CAPACITOR, OR MAGNETRON.

William Miller

• 9179 Answers
• Posted on Jan 31, 2010

SOURCE: changed bulb in whirlpool microwave model mh1150xm

We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week or so.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too, as well as other functions.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William Miller

• 9179 Answers
• Posted on Feb 10, 2010

SOURCE: LG LMVM 1935SB doesn't heat.

This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble is usually caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.


If the switch mount is broken, it's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

See this file for more help on door switches.

The service manual for your oven is here, but does not contain part numbers.

If you only need a switch, you can order a universal type here for $5 postpaid.

For other part help, contact Encompass here or call call them toll-free at 866-779-5835.

Let us know if we can help you further.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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