Question about LG LTM9000 Microwave Oven

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My kenmore 721-67902 mictowave oven beeps once evwery minute

I thought it might be the result of a pwer surge, so ishut off power at the home circuit breaker.
Even with no power , the microwave continues to beep once every minute!
Where does the appliance get the power to cause the device to beep?

There is no battery. Could there be some charged capacitor in the electronics with enough residual charge to power the beeper?

How long would one have to wait for the appliance to reset itself once the power has been removed?

What gives?

Thanks,
Donald

Posted by on

  • William Miller
    William Miller May 11, 2010

    What is your full model number?

    A full Sears/Kenmore
    model number has 3 digits, a dot, then 8 more digits, such as
    ###.########

    There
    should be a "mini-manual" (tech sheet) hidden inside the unit
    behind the
    control panel or hidden on the left side behind the grille, which is
    very helpful when troubleshooting, testing, and locating components.

    It also contains error codes, etc.

    At
    our Web site, we have a video
    available showing how to remove a typical
    over the range control panel assembly in under 5 minutes.



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MicrowaveSvc
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SOURCE: How to turn off annoying beep sounds of alert and programming

First of all, microwave ovens do not emit ionizing radiation.

The only risk from any leakage is a burn.

Generally, microwave leakage only occurs when the door / door seal is loose or damaged or there has been an improper repair attempt.

You can select a model which lets you turn the beeper on and off by looking for that feature as you shop manufacturer Web sites, or in the store ask the clerk to pull the manual for you to examine, or contact the manufacturer's help center, support center, or FAQ.

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 here. LG / Goldstar owner's manuals can be downloaded here.

If you're interested in other brands, please reply back and let me know. I'll be happy to post contact info.

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




Posted on Sep 28, 2008

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praky16
  • 744 Answers

SOURCE: I have an LG over the stove microwave that beeps

hi..
test the high voltage capacitor,the rectifier diode or the magnetron. If all this are fine, test the control board.

The diodeand capacitors can be tested. The capacitor must be allowed dischargebefore testing, or you risk to get electrocuted, even if 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...

thank u
rate me

Posted on Aug 19, 2009

  • 4 Answers

SOURCE: LMVM1935SB - Over the Range LG - fan keeps coming on, beeping

The fan will come on if you are cooking below and the area gets hot.... is this when it happens? Sometimes random beep could be a power blip... not long enough for a reset of all things electrical

Posted on Sep 21, 2009

  • 4088 Answers

SOURCE: lg micorwave, lam1180st refridgerator and

It is possible that the interconnection link(s) between the two sockets in the duplex outlet have blown apart. Turn off power at the electrical panel for this circuit, remove the outlet from it's box, and check the interlink on both sides. If obviously burned, replace the socket. A better option is to run another duplex cable from the breaker box to the outlet from a new breaker, cut the interconnections on the new socket, and wire the new cable to the isolated part of the socket. This supplies full power to each half and allows both units to run at the same time.

Posted on Oct 19, 2009

caroldon
  • 17130 Answers

SOURCE: SET TIMER FOR 20 MINUTES FOR BAKED POTATOE.. CAME

That was a very long duration to have set for potatoes. It would have made the magnetron burnt by exeeding the limit and findinf there was no conductive medium by moisture , it has ended up burning the magnetron.
First of all clean up the inside and clean up the point of the magnetron beam.Now confirm on the inside to be totally dry.
Disconnect power and check inside for break of fuse to the magnetron.If the microwave does not heat on testing with a cup of water , then it is possible that the magnetron is cooked.
Confirm the cost for the unit to decide on replacement.
Hope this helps.

Posted on Aug 21, 2010

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1 Answer

Power 100 code


you must try this:God bless you
If you are unable to adjust the power level, there may be a defective triac or a problem with the circuit board.

  1. Controller is confusedA power surge or random non-reproducible action of the universe may have resulted in the controller's program ending up in an infinite loop. Pull the plug for a minute or two to reset it.
  2. Defective Interlock switchesThis can result in the controller thinking the door is open and ignoring you.
  3. CleaningCleaning solutions (spray cleaner) may have gotten inside and shorted out the touchpad or controller. If this happens remove the touchpad, let it air dry for a few days, and then attach it back on the microwave.

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My Kenmore elite microwave is plugged into a surge protector and keep tripping the surge protector. I cannot use the microwave for more then a minute before it trips. Can you help


Your microwave is pulling more amps than the surge protector can handle. Remove the surge protector from the circuit and plug oven into wall outlet. Preferrably a GFCI circuit. Or you could puchase a surge protector with a higher amp tolerance.

Sep 04, 2011 | Microwave Ovens

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Reduce heat


Normally it's one of these two sequences to cook at 1 minute at 60% power:

Time Cook, 1, 0, 0, Power Level, 6, Start
or
1, 0, 0, Power Level, 6, Start

You can download many Kenmore owner's manuals free.

Enter your full model number at the Sears parts site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########


On the resulting page, look to the right for the blue "View manuals" button. Click there.

view_manuals_button.jpgview_manuals_button.jpgview_manuals_button.jpgfb76a88.jpg

That Sears-related site has many free manuals. While the manuals they list there are all free, they will ask you to register.

Many times, the owner's manual will also have the installation instructions inside.

If yours is not listed there for free, you would have to order it through the
Sears parts site.

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

May 04, 2010 | Kenmore 63792 Microwave Oven

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My kenmore microwave automatically starts and can not be stopped


If and when an oven is coming on or doing anything by itself, this is very dangerous and can result in a fire.

So until it is repaired, please leave it unplugged or leave the door open.

Is it possible that some spray cleaner got into the controls?

I always recommend that users instead spray cleaner on a soft cloth then wipe the control panel.

Also, I always recommend non-ammonia cleaners since ammonia can crack and damage plastic.

Otherwise, the spray can get into the controls and lock it up or make it act odd.

If it does not dry out over time, it may need to be manually dried or blown out.

The keypad may be damaged or worn out, or control unit may be damaged.

If and when an oven is coming on or doing anything by itself, this is very dangerous and can result in a fire.

So until it is repaired, please leave it unplugged or leave the door open.

On some models, the membrane keypad is not available as a separate part, so you would have to order the control panel frame assembly which comes with a new keypad.

In this case, you simply move your circuit board into the new frame. That is a simple do-it-yourself job.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you unplug the keypad (as per the photo below) and move the circuit board into your frame.

34374fd.jpg

Some connectors on the relays may have a lock:

positivelock.jpg
You can find handy exploded views and get part numbers by entering your full model number at the Sears Parts Site.

A full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Once you have the Sears part number, you can usually get parts cheaper here.

If you might be interested in having us so the work for you, we charge $39.95.

Feel free to contact me directly.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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Select Power Level button comes on by itself..!


Thank you for posting the partial model number. That narrows it down.

You have a failing membrane keypad.

If and when an oven is coming on or doing anything by itself, this is very dangerous and can result in a fire.

So until it is repaired, please leave it unplugged or leave the door open when it's not in use, and please do not leave it running unattended.


On this model series, the membrane keypad is not available as a separate part, so you would have to order the control panel frame assembly which comes with a new keypad.

In this case, you simply move your circuit board into the new frame. That is a simple do-it-yourself job.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you unplug the keypad (as per the photo below) and move the circuit board into your frame.

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

34374fd.jpg

Some connectors on the relays may have a lock:

positivelock.jpg

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I would be sure to check the microwave's outlet under a load.

One good way is to use a toaster or hair dryer for about a minute to see if they run at full power and run without their heating elements dimming.

If the power at the outlet is steady, I would suggest a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If it still fails to heat properly, I would say you have a failing magnetron, and it would just be a coincidence that the failure began after the new wiring was installed.

If you need to order the magnetron, Sears sells it for $73.13, but you can get it for $41.84 here.

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

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I would strongly suggest that you ask if the servicer does "component-level repair" on microwave circuit boards, as opposed to just replacing the whole board. This can save you a good deal of money.

If you cannot find a servicer who does component-level board repair, you can refer the servicer here for instructions.

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