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Our LG LRMP1270ST does not heat up when turned on. I was going to open it up and attempt to change the power tube. What tools do you need and where can I find a replacement part?

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The microwave turns on but does not heat food. i reset the microwave by unplugging it for 2 minutes. once plugged back in, i reset the clock. i made sure the unit was not in demo mode. it still does not...


A part called the magnetron tube supplies the microwaves which heat your food. It's possible the tube has gone bad. It's also possible that other problems are keeping the proper power from being applied to let the tube work.

Microwave ovens use hazardous voltages WHICH CAN KILL YOU, so troubleshooting is best left to professionals with the tools and experience to work on them safely. If this is a basic counter-top oven, it may be more economical just to replace it. Otherwise let a qualified technician determine what has gone wrong and give an estimate to repair.

Sep 02, 2011 | Microwave Ovens

1 Answer

Not heating but the revolving tray and lights are functioning


This is often a sign that the magnetron tube, the microwave source, has gone bad. One of the ways they can go bad is simply to burn out like a light bulb, so that the heating just stops while everything else works normally. But it's also possible that other parts in the tube's power supply or on the oven's control board are responsible.

Tracing power problems often means working on the oven while it's operating. MICROWAVE OVENS USE HAZARDOUS VOLTAGES WHICH CAN KILL YOU. Servicing is best left to professionals because of safety concerns. I would suggest letting a professional check the oven and give you a repair estimate. Or, if this is a basic countertop model, just consider replacing it. It may be more economical given the low cost of new ovens.

Jun 25, 2011 | LG Microwave Ovens

1 Answer

LG LRMP1270ST microwave is just over a year old. I put food in it, pushed "Add Minute" button and the timer comes on, the unit clicks and it doesn't come to 'life'. The timer does...


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

Microwave Oven Basic Troubleshooting Tips

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Jun 06, 2011 | Microwave Ovens

1 Answer

My LG LRMP1270ST microwave oven stopped working in the morning. It just flat died when I put 2:00 minutes on the timer and pressed start I heard the pop/breaking sound. So immediately I stopped the...


The main fuse has blown in the microwave, you also have secondary problem that sounds like the magnetron has failed, but there are two other parts to consider, the high voltage capacitor and diode work in conjunction with the magnetron to heat the food. The repairs could run as high as a new microwave oven.

Feb 14, 2011 | LG Microwave Ovens

1 Answer

After timer shuts down power, opening the door starts power up


for safty resons dont use it till you have it fixed
if there is microwave enegy flying around and it hits you you could get burnt badly

Jun 20, 2010 | LG 1.2 Cu. Ft. Mid-Size Microwave -...

1 Answer

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!!!!!

Dec 02, 2009 | LG Microwave

1 Answer

Microwave Magnetron tube has arced


REPLCE THE MAG TUBE AND ***

Feb 08, 2009 | LG Microwave Ovens

1 Answer

Micro turns on but doesnot heat also turn on by self


Hello bbmasonjim,
If your micro turns on ( meaning everything seems to be working from the control panel) and you aren't getting microwave energy to heat food..you may have any number of damaged or defective components : Magnetron Tube, Filament Power Supply or HV Capacitor.. None of which are something the untrained person should mess with. Even unplugged, there is High Voltage potential inside the electronics compartment. If it is less than a year old, it may still be under warranty.. otherwise.. the cost to repair would probably be higher than the cost to replace..

Regards,
Rick

Dec 13, 2008 | LG LRM1250 Microwave Oven

1 Answer

If we close the mircowave door the units start to run by itself. - it will not heat, but the light comes on and the turntable rotates it will not stop until we turn the power off - when power is turned...


i think you have a welded controller, either a digital one or a mechanical one. microwave won't run unless you switch it to run. the door switches are safety switches to turn off the microwave once you open the door. if you have a digital controller, you could have a welded relay, if you have a mechanical timer, it could be a welded contact at the timer. another thing is that it should heat what ever you are heating. if it is not heating, check if it has a fuse and if it is busted. some fuse are installed to protect only the magnetron that is why the light and turn table are still running. if there is no fuse to the magnetron, then check the diode from the capacitor to the ground. it could be open. if not then you can have a bad magnetron. i hope i was able to help.

Jun 24, 2008 | LG Microwave Ovens

1 Answer

Ge over the range microwave


well randy you might want to check the diode and cap with a meter first before getting the mag tube. if both of those parts are fine. replace the tube.

Apr 19, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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