Question about LG Microwave Ovens

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Microwave arcing AT THE TIME OF PRESSING START BUTTON ON THE PANEL , HEAVY SPARK COMES FROM THE INPUT TERMINAL OF MAGNETRON.

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  • LG Master
  • 9,047 Answers

If the spark is coming from the terminal of the magnetron, you will need a new magnetron.
What often happens in a case like this is that the connector is too thin or is too loose, and that leads to arcing and corrosion which can damage the magnetron terminal.
Anything less than tight and clean connections will cause failure.
The solution is to replace the magnetron and put a new crimp-on terminal on the end of the wire lead. Video here.
You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

Posted on May 04, 2013

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Posted on Jan 02, 2017

  • 38 Answers

SOURCE: Model 721.80803400 microwave blank control panel

there is a transformer on front pc board.might need tech to have a looksee

Posted on May 24, 2007

StuartB
  • 807 Answers

SOURCE: Everything works... except the heat!

Maybe one of the fuses, get an engineer to look at it, for safety reasons.

Posted on Mar 31, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Sharp R-1450 microwave

This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.

On these, it's usually a broken tab on the upper switch holder.

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.

That sounds like what's happening when you hold the Start pad - maybe you're moving the frame and chassis enough to help it work.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be 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 you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can probably find exploded views and order parts by entering your model number here at the Sears parts site.

The best place to order Sharp parts is Tritronics.

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

Posted on Aug 19, 2008

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave Magnetron tube has arced

If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.

Then you can apply some high-temperature appliance paint, available from hardware stores, department stores or appliance parts stores.

If your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.

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

Posted on Dec 08, 2008

tiway1
  • 100 Answers

SOURCE: dacor dcm24s.light, fan, and control panel work but turntable and heat do not

Most likely the bottom door switch. Dacor units are built by Sharp and that switch is a very common problem. You'd either need to check the switch with an ohm meter or remove the cover of the switch to see if it's burned inside.

Posted on Dec 23, 2008

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The unit started arching inside the front panel on the upper left corner.


Arcing Inside the Microwave - Martin Microwave Inc.

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Microwave Glass Trays, : Arcing Inside the Microwave - Microwave Glass Trays ...glass tray, microwave plate, glass trays, turntable, microwave oven, carousel, ...microwave energy, and will eventually it will start producing arcs and put out one heck... the damage is non-repairable and the unit should no longer be operated.

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Microwave oven does not respond to START button. First ..... but with the leakage from the spot welded waveguide inside the unit. ... My clue in was a spark between the waveguide and the case, when I was messing with the Controller PCB.) ...

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Dec 15, 2015 | Microwave Ovens

1 Answer

Food do not warm up


you have problem with the high voltage circuit in the microwave.
first you need to know if it is a transformer type or inverter type.
if its a inverter type then you need to check your magnetron and inverterboard also confirm if the relay on the main PCB is turning on when you press start button to cook.

If it is a transformer type then check the following:
Check the High Voltage Fuse, it gets open sometimes
Check the magnetron if it is leaky to ground.
Check the High Voltage Capacitor, it may be short to ground or across the terminal or across the terminal.
Check the High Voltage Diode, it may be short across the terminal or leaky diode reading also check to see if there is any sign of spark on the end of the terminal.

Important check is to see that the relay on the main PCB triggers when the start button is pressed.


Try this, if you cant then ask a friend with electronic knowledge to help you out with the diagnosis ?


Thanks
Ashwin

Feb 17, 2015 | Magic Chef Microwave Ovens

1 Answer

Emerson microwave oven model mw9339sb has an arcing magnetron


The magnetron is supposed to make an arc to work but when it is getting out of hand it will sound wrong. At that point it is time to change the large capacitor and the magnetron. If there is an arcing inside the cabinet then you have to look for missing powder paint. Don't use any metal racks in a microwave or they will arc.

Dec 01, 2013 | Emerson Mw9339sb Microwave Ovens

1 Answer

ARCING IN MIOCRWAVE


If the spark is coming from the terminal of the magnetron, you will need a new magnetron.
What often happens in a case like this is that the connector is too thin or is too loose, and that leads to arcing and corrosion which can damage the magnetron terminal.
Anything less than tight and clean connections will cause failure.
The solution is to replace the magnetron and put a new crimp-on terminal on the end of the wire lead. Video here.
You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.

Apr 27, 2013 | Microwave Ovens

1 Answer

When i use the microwave it makes a very loud coughing and spluttering noise and there is a flashing of lights inside. It also smells of smoke. Any help greatly appreciated. I live Bristol, England if they...


proceed according. God bless youIf you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test below.
d5b76960-7487-406d-9f65-e0e29ef0512a.jpg

Apr 04, 2013 | Samsung CE1031B Microwave Oven

1 Answer

Kenmore microwave is sparking when you it start and then goes to pause


see this steps and fix it. God bless you
If you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test below.

see the guide for test the magenetron and another component.

10_4_2012_4_21_12_pm.gif10_4_2012_4_21_39_pm.jpg

Oct 03, 2012 | Kenmore Microwave Ovens

1 Answer

Sparks when starting then goes to pause mode


see this next steps. God bless you
If you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test below.

10_4_2012_4_24_00_pm.gif10_4_2012_4_24_28_pm.jpg

Oct 03, 2012 | Kenmore Microwave Ovens

1 Answer

My LG/Dometic MICROWAVE sparks inside the cooking area when turned on


see the next steps and follow with common sense: God bless you
Microwave is arcing If you see arcing or sparking inside a microwave, turn unit off immediately. Arcing can be caused by having something metal in the oven cavity touching a side, an oven shelf is touching the side of the cavity, an oven shelf support has broken, microwave waveguide, or bad magnetron.
If your microwave has a shelf in it, and you do not use it, keep it out. If one of the shelf supports breaks or comes out, the microwave will arc where the support was. You will have to sand the spot down, paint with appliance paint and re-install support. If the shelf shifts on the support and touches the side it will arc.
Your magnetron waveguide will either come out of the top, or side of the oven cavity. Some will have a stirrer in it(mostly top waveguides) with a panel over, or just a cardboard type cover over it. Over time, the stirrer cover can become warped from the heat which will expose the stirrer's metal shaft which will then cause sparking. These covers and stirrers come in a kit and can be replaced from inside the oven cavity.
Your cover over a side waveguide is coated with a substance on it, and overtime this coating can come off from the heat and moisture in the microwave. These waveguide covers are very easy to replace from inside the oven cavity. Touch up any paint that may have chipped or come off because of the arcing.
If your waveguide cover and/or stirrer are all OK, then the spark is coming from your magnetron. The antenna on your magnetrom has overheated and burned, sending the microwaves out at the wrong angle. If you catch this microwave oven repair early enough, you can usually get by with just replacing the magnetron. If the arcing has caused servere damage inside the waveguide, you will need a new microwave. Waveguides are not replaceable and most you can barely see into them, let alone sand and re-paint. In this case of microwave oven repair, when you remove the magnetron, you will see the burned antenna, or your magnetron will fail the test bel
7_27_2012_3_56_27_pm.gif7_27_2012_3_57_12_pm.gif

Jul 26, 2012 | Microwave Ovens

1 Answer

Microwave died


microwaves have this fuse for protection, if it is blowing up, there is a shorted part in your microwave, it could be a diode, the magnetron or the high voltage capacitor.

be careful in dealing with microwave ovens because they store high voltage ( even unplug for a long time ) which may be fatal if you do not know what you are touching.

if you know what you are testing and knows how to test them, then i suggest you test the diode between the terminal of the high voltage capacitor, the high voltage capacitor for shorted terminals, and the magnetron by taking it off and inspecting the metal at the tip of the magnetron. it should be shinny and no sign of metal burning or arcing.

tnx 4 using fixya,

drcool

Aug 31, 2008 | Microwave Ovens

3 Answers

WHEN PRESSING COOK TIME OVEN CLICKS ON FOR ONE SECOND AND RESETS CLOCK


Please try on some other power point as if there is loose contact or sparking in point which cause to switch off as soon as you start because of heavy current drawn by oven and clock also resets. If not solved even then must have some short circuit or over loading in timer circuit or magnetron. in this case you have to call for a service engineer.

Jul 26, 2007 | GE JVM1860 Microwave Oven

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