20 Most Recent LG LRM1260SW Microwave Oven Questions & Answers

This could be one of four items causing the problem:
1, High voltage Diode
3. High voltage capacitor
4. High voltage transformer

LG LRM1260SW... | Answered on Oct 18, 2014

the link isn't real helpful as it all defaults to "have a professional do it"

LG LRM1260SW... | Answered on Jan 31, 2013

No! there is no reset, the problem is caused by one or more door swiches that have become defective, or the keypad control board a possibility.

LG LRM1260SW... | Answered on Apr 15, 2012

Chances are good the turntable motor has failed - but you are throwing money at it blindly if you do not test first.

CLICK HERE to see the motor.

There are other parts to the circuit as well - however without properly testing, you could end up spending more than the unit is worth.

Microwaves store potentially lethal amounts of energy that must be dissipated properly before work can be initiated. Don't risk damage to yourself or the microwave. Let a professional handle this repair.
There are 3 things I never recommend a layman chance repair for.... TVs, Microwaves, and Garage Door Springs.

They all have the potential to kill!!

Thanks for using FixYa!!

LG LRM1260SW... | Answered on Nov 09, 2011

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 ,.,./ll

LG LRM1260SW... | Answered on Aug 13, 2011

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 ,.//';

LG LRM1260SW... | Answered on Aug 13, 2011

If everything works, but the microwave oven does not heat, this is commonly caused by a failed magnetron. The magnetron is the heart of the microwave oven and produces the RF energy that is required to heat your food. In order to replace a defective magnetron, you will need to consider the following:

1. You will need to uninstall the oven from over the range in order to replace the part (you will need to do this anyway, if you decide to buy a replacement oven).

2. Ensure the oven is UNPLUGGED before servicing anything inside the cabinet and remove the exterior case in order to access the magnetron. The High Voltage circuit in these ovens produces between 3,000 and 4,000 VAC and should not be worked on unless you electronics saavy. In addition, these ovens should NEVER be turned on, or serviced with the exterior cabinet removed, or high voltage network protective cover removed.
Here are several websites that you can use that illustrate how the oven is assembled:


Repairclinic.com is another great website for parts, and has part illustrations/photographs, but does not have the exploded view to show how the appliance is assembled.

NOTE: If you've never repaired an appliance on your own before, a microwave oven is usually not a recommended appliance to start with. Some models can be rather involved in taking apart.

3. The magnetron replacement cost will depend upon the MODEL NUMBER and generally costs between $100 and $200.

Use your appliance model number and review the parts illustrations at the recommended websites to identify and locate parts, and to see if this is something that you may be able easily take apart and reassemble.

If you have any questions, please post back and let me know. I hope you find this information helpful.

LG LRM1260SW... | Answered on Aug 11, 2011

A faulty door interlock switch or a spillage has contaminated the machine.

LG LRM1260SW... | Answered on Jun 27, 2011

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips



LG LRM1260SW... | Answered on May 14, 2011


Investigate these three areas if your microwave won't heat:

Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

Testing a diode

NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor.

Whether it is shorted or open, a defective diode will most likely show some sign of defect. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. Also, it may have split in two, or it may exhibit a burned crack, or possibly even a blistered spot.

A shorted diode is indicated by a loud humming noise from the high voltage transformer, and no heat produced when a cook cycle is initiated. Whereas little or no heat produced in your microwave, with an absence of a humming noise is indicative of an open diode. In either case, the diode has to be replaced.

With your microwave unplugged, and your capacitor discharged, use extreme caution to remove the lead that leads to the capacitor. You can leave the ground connection attached. The side of the diode that goes to the ground is usually marked with a dot, stripe, or arrow. Set your ohmmeter to R x 10,000 or higher. Touch the positive meter probe to the anode and the negative meter probe to the cathode to measure the resistance across the diode terminals. Remember that the cathode is on the side that goes to the ground, which is often marked by a dot, stripe, or an arrow.

A normal diode, that is a non-defective diode, will read anywhere from 50,000 to 200,000 ohms. Differences in microwave make and model account for this large range in resistance readings.

Reverse the meter probes and measure resistance while touching the positive probe to the cathode and the negative probe to the anode. Reversing the probes like this should result in a reading of infinity. Unless a bleeder resistor is present. The presence of a bleeder resistor would produce a reading of the value of the resistor.

High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Testing a magnetron

NOTE: Before you test this component, make sure your microwave is unplugged, and that you have discharged the capacitor.

There are two tests to conduct in order to determine whether or not a magnetron has become defective. If you receive results other than what are detailed below, you will have to replace your microwave's magnetron. Each test is described for you here:

TEST 1: Locate your magnetron and label each of the wires attached to it so that you know which wires are to be replaced where. Set your ohmmeter to the lowest resistance scale. Take a resistance measurement between each of the magnetron's terminals by touching each probe to one terminal each. Reverse the probes and take a second resistance measurement. Each measurement should read less than one ohm.

TEST 2: Set your ohmmeter to its highest resistance scale. Touch one of the meter's probes to a magnetron terminal. Touch the other probe to the metal magnetron housing. Take special caution to not touch the two probes together. This could result in an inaccurate reading. This test should produce a reading of infinity - indicating an open circuit.

Read the tips on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.



I hope the above is helpful.

Good luck.

LG LRM1260SW... | Answered on Feb 26, 2011

Not finding what you are looking for?
LG LRM1260SW Microwave Oven Logo

43 questions posted

Ask a Question

Usually answered in minutes!

Top LG Microwave Ovens Experts

Cindy Wells

Level 3 Expert

6220 Answers

Sheldon Dedek

Level 3 Expert

912 Answers

Randy Schumann
Randy Schumann

Level 2 Expert

410 Answers

Are you a LG Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

LG Microwave Ovens

  • LG Microwave Ovens

Most Popular Question

re lg microwave model

  • Microwave Ovens