20 Most Recent LG LRM1250 Microwave Oven Questions & Answers

That loud hum is an indication that the Magnetron is shorted.

the magnetron might be defective, also check the door interlock switches, they cause a variety of problems.

Hello

Get beneath the LG microwave, and grasp it on the bottom at either end. Lift the microwave up slightly, and pull it out from the wall to remove it from the mounting plate.


Turn the microwave onto its face on a soft rug or blanket. Remove the screws from the back panel of the microwave, and slide the panel upward to take it off the unit.


Look for the three fuses in the LG microwave -- one at the lower-right corner, one in the upper-right corner and one in the top center. Check each of the fuses to see if any of them look dark in color; this indicates a burned-out fuse.


Remove the burned-out fuse by gripping it firmly and pulling it away from the wall of the microwave. Once the fuse is removed, press the new fuse into the same position in the microwave until it clicks into place.


Slide the back panel onto the microwave, and replace the screws. Lift the microwave into the space beneath the cabinet from which it was removed, holding it slightly higher than the mounting plate, and lower the microwave until it catches on the mounting plate.

It definitely proves that the high-voltage diode is good since the oven works when the interlock switches are taped activated. The only problem is the interlock switch. Contact the LG parts seller in your area for the details and availability of the interlock switches.

Classic symptoms for failed door interlock safety switches, though it could be other trouble.

Remove the cover and check the operation of the little micro switches that operate when you close the door.

DONT TOUCH THE SILVER CAN - LETHAL.

If you regularly open the door while cooking, the contacts in these little switches become burned. When burned badly enough, they cannot make contact. When they cannot make contact, the mocrowave doesnt know the door is closed and will not turn on the magnatron resulting in no heat.

If you need more help, let me know.

a

Hi,
There is a device in your microwave oven called a magnatron. This device generates the microwaves which heats up the food. If all is working but there is no heat, it means the magnatron is faulty or perhaps part of the magnatron circuitry. Check all fuses and then have the magnatron tested by a qualified technician if all fuses are okay.
Please let me know if this has helped solve your problem.
Best wishes,
Graemevm

If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.If turntable is not running check also the door switch.

The diodeand capacitors can be tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, evenif power is off.Capacitors can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.



All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

Here is a link you or someone you know can use to test it, but please read the safety info:
http://www.gallawa.com/microtech/cap_test.html

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

Okay, it does sound like your membrane keypad is worn out at the Start pad.

It may be available separately as a key sheet or already attached to a new plastic frame.

In case it comes as a key sheet and if you (or someone you know) might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

LG's Latin American Wen sites are here.

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

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

Chances are you have shorted or blown high voltage rectifier diode.

Here is a link you or someone you know can use to test it, but please read the safety info:
http://www.gallawa.com/microtech/diode.html

To order Goldstar / L.G. parts, visit Vance Baldwin Electronics.

For more Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

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

MicrowaveSvc - Thank you so very much for coming back to me re the worn down wheels on the turntable ring. Fortunately however, I managed to buy three of these rings, all different sizes and tied together, in a junk shop for 10cents!! My husband then cunningly removed the wheels from the one that were most like ours and placed them onto our ring. Hope this makes sense. The microwave is now working perfectly, necessity being the mother of invention! I will take note of this site however!! Thanks once again for your interest in a microwave turntable ring in a motorhome in New Zealand!
Sandre Bowe.

hi i am suggesting that it is probably the magy as the res to grndis a bit low and therefore loading the sec supply down , just a thought
cheers grant

Even though the magnetron passed the continuity tests, it can still be bad. In fact, most of them fail in ways that do not show up in continuity tests.

And I am 99% certain yours is bad, especially since you have proven that the filament voltage and high voltage DC is being produced and sent to the magnetron.

I must say that the testing you have done is not recommended for people without plenty of experience, but apparently you did it safely. Please don't press your luck, since the high voltage can be instantly lethal.

For Goldstar / LG / L.G. parts, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

We're happy to help and we appreciate your thoughtful rating of our answer.

Most likly the High Voltage diode or capcitor is bad.

You can see and hear a YouTube video of how a turntable motor should sound when you rotate it by hand.

If yours won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven. You may have to cut the cover off with snips, then use a screw when reassembling it.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit http://www.lgservice.com.

We're happy to help and we appreciate your thoughtful rating of our answer.

Some over the range models allow you to turn off the turntable via the keypad. Counter top models usually don't.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand: http://www.youtube.com/watch?v=rPSWi_z7M58

If yours won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven. You may have to cut the cover off with snips, then use a screw when reassembling it.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit http://www.lgservice.com.

We're happy to help and we appreciate your thoughtful rating of our answer.

Looks this model's turntable support has a coupler shaft built-in which is supposed to go down into the turntable motor hole and make contact with the turntable shaft. Is that right in your case?

So I would wonder if the turntable support has gotten bent due to heat. That's common on some models.

When you take it out and look at it from the side, are the legs straight and perpendicular to the shaft or are they bent down?

On some models, you can heat them over a stove flame, then put them on a flat surface with a weight to old them in position while they cool.

Otherwise, you'll need a new turntable support. LG / Goldstar calls this a "rotating ring".

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit http://www.lgservice.com.

We're happy to help and we appreciate your thoughtful rating of our answer.