I have watched a lot of videos. I tested everything and still no heat. THEN I FOUND OUT THE MAGNETRON TIP SHOULD BE SILVER WATCHING THIS VIDEO !!! you are the only guy that mentioned this !!! i checked every component countless times !! FINALLLY AN ANSWER ! THANK YOU JIM !!
Jim, The reason the Tip of the Magnatron (antenna) is discolored is that the Magnatron gets extremely hot hence the fan and aluminium cooling fins within the Magnatron. The discoloration is due to the heat and is nothing to worry about within a week a new one will look just the same. Biggest tip for all users is to make sure the cooling intake to the fan is clean. Magnatron magnets X2 will crack due to heat and operating effiency drops dramaticly. ALSO REMEMBER TO ALL PEOPLE......THE CAPACITATORS IN THE MICROWAVE DO STAY CHARGED THE CHARGE CAN AND OR WILL KILL. DISCHARGE BEFORE YOU DO ANYTHING> Graeme
Just wanted to say thanks. I had 120 volts into the transformer but no heat. Everything tested good with a voltmeter. But the tip on the magnitron. It was driving me nuts then I viewed your video and changed it. It worked great. Thanks again!
Jim I want to thank you for the comment about the tip being brown. I also had the same problem and after checking all components, transformer, power diode, capacitor door inter locks and megatron all checked good. Many videos tell you if megatron is 1 to 2 ohms and not shorted it is good. This is not a true statement. I also did one other step by checking amp draw and my megatron was pulling vertically no amp's. After replacing new one which by the way showed exactly the same ohms but was pulling close to 15 amp's. Great info on the tip.
I know this is old but I’m changing my tube now. In 30 years of mw repairs I may have only had two that checked bad with a multi meter. Honestly it’s process of elimination. Only four parts make a microwave and the other three are either good or bad on a meter. Mag tubes get hot so the discoloration isn’t 100 percent accurate. Mag tubes start moding internally. It can also be checked by seeing if an amp meter occilates rather than remain steady between 9 to 12 amps. Diodes generally short and or crack and are obvious and capacitors can be checked for a short to ground or the blip test. Transformers seldom fail so if a microwave doesn’t heat the most likely cause if the transformer has power is: Diode Capacitor Magnetron Tube Transformer
Thank you for the video as I have been searching for the answer as well - changed the transformer (was bad), a relay that had a burned connector to the transformer primary line, and everything else checked out fine. The capacitor, diode, the door micro-switches - all good! I finally ordered a magnetron and keeping my fingers crossed. This is a 4 year old video, but just wanted to appreciate it since it added more hope in this interesting journey! Best wishes if you read this comment!
Your welcome. The Magnetron is expensive and I believe I couldn't return it if it wasnt the problem. It was posted in one of the comments about the silver color. Since my magnetron had litte silver on it i was certain that was the problem.
@@JimMcLaren1950 Well the magnetron was the culprit! The microwave is back to business again. It was impossible to suspect the mag based on the YT tests I came across.
Thank you. Sometimes tough to see ,with all these unforgiving parts, if it is worth fixing! Gotta start somewhere!! Thank you, a lot of hours just to get here, thank you!
This video was key to repairing my GE microwave that seems to be built by LG. Magnetron passed multimeter test, but the antenna was discolored. New magnetron antenna was silver, installed it and viola! Good as new.
Happy my video helped. Like mine the antenna had no silver on it, proving that it was the magnetron even though it passed the multimeter check. Thanks for posting.
I got the same problem, will be buying a new magnetron and replacing it, but this video got me a little worried that the root cause is somewhere else - maybe in the mica plate?? ua-cam.com/video/dm6Z21M_KgI/v-deo.html Did you had any problem soon after? Or everything is still fine with both your microwaves?
Hmmmm, I was going nuts checking all the parts the different youtube videos recommended. All looked good...magnetron and all. I also assumed it was the magnetron but my multimeter test showed good as yours did. I'd hate to spend all that money on a magnetron only to find out that wasn't the issue. You took the chance and it worked out. I'm going to give it a try. It that's not it then I'll have a spare magnetron. Thanks for video.
@@JimMcLaren1950 THANK YOU, THANK YOU, THANK YOU! It was the magnetron. If it wasn't for your video I wouldn't have taken the chance to buy it because every other video I saw showed how to test it and no one said that it could still be bad even if the multimeter test showed otherwise. FYI, another test that threw me off was the "thermo fuse" test. Well I hade a thermostat fuse (looked exactly like the thermo cut off/fuse). The test on that showed no conductivity (continuity multimeter test) so I thought that I found the problem. When I went to purchase it they said that it activates at 150 deg...therefore, conductivity at 150 deg. I verified this by heating it up with a lighter...cool no continuity....heated continuity. Just some info in case you come across that. Peace, and thanks again.
@@mgpvii Your welcome. Magnetron is so expensive so I can see people very reluctant to buy one. Thanks for posting about the thermal cut off/fuse, good info.
Hi. Thanks for the video. I just have one question. My microwave turns on andi hear the humming but the turntable is not turning and of course the food is not getting hot. What can be the problem?
Your welcome. Think your turn table motor needs to be changed. I found a video explaining how to change the motor, ua-cam.com/video/bL978s7wpic/v-deo.html
Ty for the video....I had the same issue thinking mine was not bad...checked it with my meter and like u, mine checked out fine. My tip was still nice and silver so huh...I'm sorry to say I did watch another video and he recommended to physically check the magnets...well by golly one if not both had a crack in it...I have not replaced with new one yet but I bet thats it...thanks.
Hi Jim, what is the significant of silver colour on the tip of the magnetron, I have a working Microwave whose metal compartment where food is cooked had rotten away through rust and corrosion, so a friend gave me his faulty good condition Microwave whose Magnetron has packed up, I then swapped my working Magnetron into his after making a few mods to fit it as the mounts were different, I noticed that the metal silver tip of my working magnetron had burned on one edge making a hole on its edge as well as the center holethrough which the waves get emitted, I covered the small hole that had burned through on the tips edge with a self adhesive copper tape and allowed it to run, apart from some minor noise the microwave is now working, heating water, I cooked a medium size (roughly 3" ) jacket potato on full power and it cooked it perfectly, I wanted to make sure the magnetron's tip I covered in copper tape was still intact, stayed in place, and to see how hot it got after 5 minutes of cooking, so I immediately unplugged from the power socket, opened all screws and took the cover off, discharged the capacitor terminals to earth, no sparks were seen, then I touched the magnetron and it was pretty hot to touch, took it out to check the silver tip which is now covered in copper tape, it was still intact but its colour had changed from copper redish/brown colour to semi Gold colour, now I am wondering if microwaves have turned copper into Gold, would I get any credit for this? I have now managed to prise off the silver tip from the bad magnetron , I used a pipe wrench to grip it and rotate it back and forth, it came lose, and inside was a copper tube whose end had been squashed tight to seal the end, and this silver cap fits over it , so I pushed tight this silver cap on top of the good working magnetron, all seems fine now, even that minute noise has disappeared. All working good, cooked jacket potato in 5 min.
Thanks for the video. I will never purchase another LG product. My two year old, $600 dollar microwave just bit the dust. Called for warranty, magnatron has a 10 year warranty. But the labor is $240.00 for the tech to replace it. I will forget the warranty BS and purchase the part and do it myself.
Good, sir Can the DEFY SMO 343 work well/ not, with any type of magnetron.? Kindly advise on this matter.? May I replace the magnetron with any brand and similar specs
Never heard of the Defy SMO 343 but from the pic looks like a nice microwave. You can use any brand magnetron as long as it is compatible with your microwave,
Would you happen to know how to disconnect the capacitor from that particular unit? I’ve got mine apart I’ve got the only screw that’s on the back of the microwave on on the outside that I thought is holding onto the capacitor but it’s not budging.
I never removed the capacitor. Watched few videos and there was only one screw holding the capacitor. What I saw was there was a bracket holding the capacitor. Look on the side or underneath the unit.
So checking the old and the new magnetron with the multimeter gave the same result, meaning that until you change it you are not sure. I don't think the color it is a sure thing either: The color does not change instantly, 5 days ago when it was working probably had the same color
Thanks John, it wasn't working 5 days ago , first video was published Oct 18. In this video you can clearly see that the original magnetron had no silver on it compared to the new one. Someone made a posted a comment in another video on magnetron that even if the magnetron checked out with multimeter if the color was brown or little silver on it, it was the magnetron that wasn't working. I wasn't 100 percent sure but it was worth it to buy new magnetron.
.4 maybe your multimeter calibration. If not shorted to body you can remove two wire and check from screw driver one by one if sparking while running .If sparking meaning magnetron was defective
Thanks for this video... Please, how do you figure which megatron to buy. I fixed mine and i noticed that the guy that fixed it used a megatron of a smaller microwave instead of replacing the same old one. i am using LG MODEL: MS3949CS /00 230V ~ 50Hz MAX.1450W 1450 2450MHz 1000W the details are according to the sticker on my MICROWAVE
@@JimMcLaren1950 okay. Thanks a lot for the feedback. So if I go to the parts shop with the details of the sticker on the microwave. They will be able to tell me which MEGATRON will work best for the microwave?
One of the most common failures in a magnetron is that one or both of the circular magnets on it will have a crack in it. An ohm meter will not show this. You can often see the crack. I don't believe the color of the tip has any bearing on whether the magnetron is good or not. It will change color with normal oxidation and will not affect its operation. Out of two microwave repairs I've done recently, both had a cracked magnet. Probably caused by heat. Check that the cooling fan to the magnetron is clean and unobstructed.
Thank you Jim for your video. I have a Logik macrowave. It stopped heating and when I checked, the magnetron was missing. The worse part is I don't know the type which was there and I intend to replace it. Which type do you think can be compatible?
There is a model number located some where on your microwave. Front panel inside the door or at the back of the unit. The model number will be printed some where on your microwave. You need that model number to get the right magnetron from your parts supplier.
So in your earlier video - you showed that the Magnetron checked out good ??? Ive also seen other videos that showed how to test like you did. I replaced my Magnetron several months ago and all was well. Recently my microwave stopped heating again, so I blindly replaced the capacitor and diode thinking that would do it - NO heat.. went through and did all the checks this time and all switches are good, fuses etc . any idea if my Magnetron could have went out that quick ? Also you never followed up on your Transformer check?
The Magnetron did check out good in a previous video using a multimeter. The magnetron didn't have any silver on the end of the magnetron even though it checked out ok with the multimeter that was the problem with my magnetron. It is very possible that the magnetron went again but there must be a warranty on the replacement magnetron. I purchased 2 new switches ( 2 switches are the same one is different ) and tried the new switches to be certain it wasn't the switches. I would see if they will replace the magnetron if its under warranty. Check the end of the magnetron watch the video again you will see there was no silver on my magnetron. I did try the transformer check but it was hard to get a reading on the body of the transformer the coating was hard to scratch off so I never completed the Transformer check. There are other detailed videos on the actual transformer check. Let me know how you make out. Thanks for posting.
No , you have to replace the magnetron with model that was designed for your microwave.They are designed to operate at various frequencies and output power levels.
Make sure those screw are tight, I have noticed in the newer models the mag has safety hangers and tabs to prevent it from coming loose and falling out.
I doubt even a half percent of the viewers have any idea about the specifics of “discharging a capacitor” - “just get some insulated pliers and stick em in here” doesn’t cut it; I’ve shorted out far too many things in my life to take such a casual approach… I mean…c’mon!
My magnetron had 0 resistance, connector was burnt. Cheapest used magnetron was 20 (smaller one from different model) I bought used microwave for $20 on the same day. Check craigslist first before you spend a few hours diagnosing/learning. New magnetron is definitely same price or more expensive than same type used microwave. My old microwave, I was trying to repair, was rusty, ugly and turn table didn't work for 15 years! Good luck, guys! BTW, magnetrons die if there is no food inside
On thing I learned and might be good info: turntable not running is similar to no food inside since the microwaves might not get absorbed by the food as when it is turning. Thanks for the comment!
hello mr jim mc laren pls advice me what to be done of my microwave oven, the problem is power is on but the unit is not working at all ,despite of touch push button being press. this is what ive done, checking and inspectio with my digital multi tester, fuses, magnetron, diode, capacitors, transformer, and the micro switch in the door contact, all the inspection and testing being done but the problem is still exist, by checking the main components are base of what I viewed from tutorials in u tube. please help.
When you press the button on the panel does that work. Example you press 30 seconds hit start and nothin happens . If you press the panel button and nothing comes on then you may have a loose ribbon cable on your panel.' If there is no heat check that there is silver on the end of the magnetron.
I got my magnetron at the parts store. It has to be compatible with your microwave. So you cant take a magnetron out of a different microwave or model,
My microwave is heating but very low. The quantity of water which was taking 1 munute earlier not the same quantity of water is taking 3 minutes to same temperature. Is it time to replace magnetron or is there some thing else? Please suggest.
Take a look at the silver you have on the magnetron. In my video there was very little silver and would not heat. Maybe you have some silver enough to heat but slower. time. Only thing is the magnetron is expensive to change.
Would a bad magnetron cause the microwave to act as if it's not even plugged? Mine is completely dead and the main fuse checks out fine with the ohmmeter. Any ideas?
In my case it was the end of the magnetron that was bad.( no silver on end ) . I had power to the turntable but would not heat.Some microwaves have 2 fuses inside the microwave case.
Microwave ovens also have a thermal cutout. When our Panasonic magnetron failed it took the thermal cutout with it. Very simple to check and replace only 2 wires.
I have a 2004 gold star which is LG microwave. A friend of mine who works on microwaves was replacing the magnetron but, he never came back. He has already installed it but did not hook up the connectors. Is there a certain way the wire connectors have to be hooked up to the magnetron and, if there is, is there a video that shows this? Nobody knows what happened to him.
Whatever the color of the magnetron antenna, mine had a big hole melted in the side. I expect that means the magnetron is bad. It is definitely worth checking the antenna on a device that yet tests good on the meter. Many, many thanks. The replacement costs $268. We wlll probably buy a new microwave.
Is it possible to check the magnetron by simply taking off the upper grill on the microwave oven and using the meter? A tech came and that's what he did and determined it needed a new magnetron, capacitor and diode.
Snap a picture before dismatelling any thing Circuits are also available be sure to fix the capicitor and diode in right way otherwise your main fuse will blow immediately
I would check first the high and low voltage on the magnetron. If I find high and low voltage present then it is sure the magnetron is dead.(consider that, it is a shorter way to find the problem)
Yes it is the proper way but the problem is this a handy man dont have high voltage checking meter our multimeters max range is 1000 v ,unless you have pro meter how can you check coz it is a doubler circuit .the magnetron works as vacuum tube it has filaments it has high voltage it generates frequency. The only way is hit and trail you are correct sir.
Could have been a bit louder don't recall just remember it didn't heat. Could be the turn table there is a small motor under the plate that went on mine. That one was under warranty. Some how this post got duplicated.
Don't use the number on the label inside the door of an LG. That's the part number for the label! I did find it that way by back cross-referencing. The right number is on the label on the back. :)
@@JimMcLaren1950 yep, after replacing the magnetron and diode and capacitor I ordered the 3 pack of door switches and did all three. No dice! Just went and bought a whole new one, installed it and it’s working perfectly. $400 later… what a bummer. But I tried!
Hi Jim, I found this video extremely valuable. One question I have is, what type of screwdriver are you using? I knew about magnetic ones, but I noticed you were rotating your wrist without letting go of the handle, so it must be some feature that lets it go only in one direction? I didn't know those exist!
Pat, the screwdriver I used is the Wera Kraftform Kompact 27 RA 2 available on Amazon. I did a review of this screwdriver ua-cam.com/video/JMFkZ8A9zq4/v-deo.html
@@JimMcLaren1950 i think i found the reason. it's the magnetron waveguide cover. the previous one was burnt and I did not replace it so when I replaced the magnetron that burnt out cover sent spark back to the magnetron.
Wish I had seen this video first. Have gone thru my whole microwave...all parts testing good, except the transformer...it was shorted and blowing the internal fuse. So, I got a new/used transformer that tests good with 102 ohm running thru coil. I installed it, microwave runs now without blowing fuse, but still loud hum and no heat. Bought a new capacitor...still no heat. Now, I see this video. Oh well. I dont think the wife is going to let me spend any more money on this micro. But, I am guessing either, that the magnetron pulled too much current when it quit and shorted the transformer, or, lightning ran thru the microwave. All I know, is everything else on the microwave works....fans, lights, turn table....just, no heat.😒
Yes there is still power there even after unplugging it. I would look at other videos on how to change the light. See how they deal with the power. Depends where your light is located. My bulb was beside the Magnetron so I had to take the cover off.
A Ha! You said "As long as you don't get all zeros". I know in testing a magnetron there should be less than 1oHm between the contacts. But what I there's absolutely NO reading at all?
Right, SOME sort of reading. If there's no resistance or no reading it's bad...There's no continuity to the case from either terminal, but the resistance between is 0.
⚡Will I get electrocuted? My sister is freaking me out. So I just have to discharge the capacitor with insulated plyers? ⚡⚡ I have the new part ready to go. HELP!! 😳
Yes your sister is right. You have to make sure you have insulated pliers to discharge the capacitor . I had my microwave unplugged for several days and still used the pliers. Be very carefull. Very dangerous.
My microwave works fine if you don't put it in for more than 2 minutes if you put something in for over 2 minutes it only makes it look warm why is that
I've got a Anko 34 litre microwave made in China it had very little use, it's just less than 2 years old and it's magnetron went, it will probably end up in landfill, ill never buy Chinese again.
No didn't hear any humming or vibrating sound. Yes check Magnetron. Check with multimeter like in this video and check for silver on the magnetron as well, also mentioned in this video.
I have watched a lot of videos. I tested everything and still no heat. THEN I FOUND OUT THE MAGNETRON TIP SHOULD BE SILVER WATCHING THIS VIDEO !!! you are the only guy that mentioned this !!! i checked every component countless times !! FINALLLY AN ANSWER ! THANK YOU JIM !!
Your welcome Big D. Very happy that my video helped you out.
Just curious. Does the discoloration mean that it is burned out?
@@xftbllplyr2091 not necessarily. If you have a no heat condition, and the tip is discolored, your magnetron is most likely dead.
Me have check still not heating
Jim,
The reason the Tip of the Magnatron (antenna) is discolored is that the Magnatron gets extremely hot hence the fan and aluminium cooling fins within the Magnatron. The discoloration is due to the heat and is nothing to worry about within a week a new one will look just the same. Biggest tip for all users is to make sure the cooling intake to the fan is clean. Magnatron magnets X2 will crack due to heat and operating effiency drops dramaticly. ALSO REMEMBER TO ALL PEOPLE......THE CAPACITATORS IN THE MICROWAVE DO STAY CHARGED THE CHARGE CAN AND OR WILL KILL. DISCHARGE BEFORE YOU DO ANYTHING>
Graeme
Thank you very much for posting. Very detailed explanation.
Jim McLaren
Thanks Jim
Graeme
Just wanted to say thanks. I had 120 volts into the transformer but no heat. Everything tested good with a voltmeter. But the tip on the magnitron. It was driving me nuts then I viewed your video and changed it. It worked great. Thanks again!
Your welcome. Happy my video helped.
Jim I want to thank you for the comment about the tip being brown. I also had the same problem and after checking all components, transformer, power diode, capacitor door inter locks and megatron all checked good. Many videos tell you if megatron is 1 to 2 ohms and not shorted it is good. This is not a true statement. I also did one other step by checking amp draw and my megatron was pulling vertically no amp's. After replacing new one which by the way showed exactly the same ohms but was pulling close to 15 amp's. Great info on the tip.
Your welcome John, thanks for posting. Good info.
I know this is old but I’m changing my tube now.
In 30 years of mw repairs I may have only had two that checked bad with a multi meter. Honestly it’s process of elimination. Only four parts make a microwave and the other three are either good or bad on a meter. Mag tubes get hot so the discoloration isn’t 100 percent accurate. Mag tubes start moding internally. It can also be checked by seeing if an amp meter occilates rather than remain steady between 9 to 12 amps. Diodes generally short and or crack and are obvious and capacitors can be checked for a short to ground or the blip test. Transformers seldom fail so if a microwave doesn’t heat the most likely cause if the transformer has power is:
Diode
Capacitor
Magnetron Tube
Transformer
Thanks for posting Lots of good info on microwaves repairs.
Good call on the discolouration. This is an educational moment for US all. M.J.😊
Thank you
Thank you for the video as I have been searching for the answer as well - changed the transformer (was bad), a relay that had a burned connector to the transformer primary line, and everything else checked out fine. The capacitor, diode, the door micro-switches - all good! I finally ordered a magnetron and keeping my fingers crossed. This is a 4 year old video, but just wanted to appreciate it since it added more hope in this interesting journey! Best wishes if you read this comment!
Your welcome.
The Magnetron is expensive and I believe I couldn't return it if it wasnt the problem.
It was posted in one of the comments about the silver color.
Since my magnetron had litte silver on it i was certain that was the problem.
@@JimMcLaren1950 Well the magnetron was the culprit! The microwave is back to business again. It was impossible to suspect the mag based on the YT tests I came across.
@@santanumaitra3962 Glad to hear your microwave is back in business.
Thank you. Sometimes tough to see ,with all these unforgiving parts, if it is worth fixing! Gotta start somewhere!! Thank you, a lot of hours just to get here, thank you!
Your welcome.
Very informative and simple instructions, Thank you!!!
Your welcome , thanks for posting.
Thanks a lot.. your video helped me to save a good money ❤
Your welcome. Happy that my video saved you money.
This video was key to repairing my GE microwave that seems to be built by LG. Magnetron passed multimeter test, but the antenna was discolored. New magnetron antenna was silver, installed it and viola! Good as new.
Happy my video helped. Like mine the antenna had no silver on it, proving that it was the magnetron even though it passed the multimeter check. Thanks for posting.
I got the same problem, will be buying a new magnetron and replacing it, but this video got me a little worried that the root cause is somewhere else - maybe in the mica plate?? ua-cam.com/video/dm6Z21M_KgI/v-deo.html Did you had any problem soon after? Or everything is still fine with both your microwaves?
Powerful information!!
Thank you.
Hmmmm, I was going nuts checking all the parts the different youtube videos recommended. All looked good...magnetron and all. I also assumed it was the magnetron but my multimeter test showed good as yours did. I'd hate to spend all that money on a magnetron only to find out that wasn't the issue. You took the chance and it worked out. I'm going to give it a try. It that's not it then I'll have a spare magnetron. Thanks for video.
Your welcome. Hopefully its the Magnetron. I had the same thoughts if it wasn't the Magnetron then i would have a spare.
@@JimMcLaren1950 THANK YOU, THANK YOU, THANK YOU! It was the magnetron. If it wasn't for your video I wouldn't have taken the chance to buy it because every other video I saw showed how to test it and no one said that it could still be bad even if the multimeter test showed otherwise. FYI, another test that threw me off was the "thermo fuse" test. Well I hade a thermostat fuse (looked exactly like the thermo cut off/fuse). The test on that showed no conductivity (continuity multimeter test) so I thought that I found the problem. When I went to purchase it they said that it activates at 150 deg...therefore, conductivity at 150 deg. I verified this by heating it up with a lighter...cool no continuity....heated continuity. Just some info in case you come across that. Peace, and thanks again.
@@mgpvii Your welcome. Magnetron is so expensive so I can see people very reluctant to buy one. Thanks for posting about the thermal cut off/fuse, good info.
You can always tell when a magnetron is toast by the sound it makes.
Hi. Thanks for the video. I just have one question. My microwave turns on andi hear the humming but the turntable is not turning and of course the food is not getting hot. What can be the problem?
Your welcome. Think your turn table motor needs to be changed.
I found a video explaining how to change the motor, ua-cam.com/video/bL978s7wpic/v-deo.html
Ty for the video....I had the same issue thinking mine was not bad...checked it with my meter and like u, mine checked out fine. My tip was still nice and silver so huh...I'm sorry to say I did watch another video and he recommended to physically check the magnets...well by golly one if not both had a crack in it...I have not replaced with new one yet but I bet thats it...thanks.
William your welcome. Thanks for posting about the magnets. That's a excellent check that is not mentioned much in videos about the magnetron..
Hi Jim, what is the significant of silver colour on the tip of the magnetron, I have a working Microwave whose metal compartment where food is cooked had rotten away through rust and corrosion, so a friend gave me his faulty good condition Microwave whose Magnetron has packed up, I then swapped my working Magnetron into his after making a few mods to fit it as the mounts were different, I noticed that the metal silver tip of my working magnetron had burned on one edge making a hole on its edge as well as the center holethrough which the waves get emitted, I covered the small hole that had burned through on the tips edge with a self adhesive copper tape and allowed it to run, apart from some minor noise the microwave is now working, heating water, I cooked a medium size (roughly 3" ) jacket potato on full power and it cooked it perfectly, I wanted to make sure the magnetron's tip I covered in copper tape was still intact, stayed in place, and to see how hot it got after 5 minutes of cooking, so I immediately unplugged from the power socket, opened all screws and took the cover off, discharged the capacitor terminals to earth, no sparks were seen, then I touched the magnetron and it was pretty hot to touch, took it out to check the silver tip which is now covered in copper tape, it was still intact but its colour had changed from copper redish/brown colour to semi Gold colour, now I am wondering if microwaves have turned copper into Gold, would I get any credit for this?
I have now managed to prise off the silver tip from the bad magnetron , I used a pipe wrench to grip it and rotate it back and forth, it came lose, and inside was a copper tube whose end had been squashed tight to seal the end, and this silver cap fits over it , so I pushed tight this silver cap on top of the good working magnetron, all seems fine now, even that minute noise has disappeared. All working good, cooked jacket potato in 5 min.
Throw it all away. You should not be making mods on a microwave and it's magnetron, you dolt.
Thanks for the video. I will never purchase another LG product. My two year old, $600 dollar microwave just bit the dust. Called for warranty, magnatron has a 10 year warranty. But the labor is $240.00 for the tech to replace it. I will forget the warranty BS and purchase the part and do it myself.
Your welcome. Outrageous labor ( $240 ).
Good, sir
Can the DEFY SMO 343 work well/ not, with any type of magnetron.?
Kindly advise on this matter.?
May I replace the magnetron with any brand and similar specs
Never heard of the Defy SMO 343 but from the pic looks like a nice microwave.
You can use any brand magnetron as long as it is compatible with your microwave,
Thanks Jim.
Welcome Mike.
Would you happen to know how to disconnect the capacitor from that particular unit? I’ve got mine apart I’ve got the only screw that’s on the back of the microwave on on the outside that I thought is holding onto the capacitor but it’s not budging.
I never removed the capacitor. Watched few videos and there was only one screw holding the capacitor.
What I saw was there was a bracket holding the capacitor. Look on the side or underneath the unit.
Thank you so much for this video
Your welcome Elsa.
So checking the old and the new magnetron with the multimeter gave the same result, meaning that until you change it you are not sure. I don't think the color it is a sure thing either: The color does not change instantly, 5 days ago when it was working probably had the same color
Thanks John, it wasn't working 5 days ago , first video was published Oct 18. In this video you can clearly see that the original magnetron had no silver on it compared to the new one. Someone made a posted a comment in another video on magnetron that even if the magnetron checked out with multimeter if the color was brown or little silver on it, it was the magnetron that wasn't working. I wasn't 100 percent sure but it was worth it to buy new magnetron.
@@JimMcLaren1950 found a company to rebuild mine. Replacement not available. CoreCentric Soulutions.
.4 maybe your multimeter calibration. If not shorted to body you can remove two wire and check from screw driver one by one if sparking while running .If sparking meaning magnetron was defective
@@seniorwillmine is measuring 1.6 ohms. What do you think? Is it toast? It works randomly. Thanks!
Thank you for the video
Your welcome.
Thanks for this video...
Please, how do you figure which megatron to buy. I fixed mine and i noticed that the guy that fixed it used a megatron of a smaller microwave instead of replacing the same old one.
i am using
LG
MODEL: MS3949CS /00
230V ~ 50Hz MAX.1450W
1450 2450MHz 1000W
the details are according to the sticker on my MICROWAVE
I would go to a parts store and they can reference the part you need
Or check Amazon I would not put a different magnetron in.
@@JimMcLaren1950 okay. Thanks a lot for the feedback. So if I go to the parts shop with the details of the sticker on the microwave. They will be able to tell me which MEGATRON will work best for the microwave?
@@Pentatonickc Yes think all your is model number but wouldnt
hurt to bring all sticker info.
One of the most common failures in a magnetron is that one or both of the circular magnets on it will have a crack in it. An ohm meter will not show this. You can often see the crack. I don't believe the color of the tip has any bearing on whether the magnetron is good or not. It will change color with normal oxidation and will not affect its operation. Out of two microwave repairs I've done recently, both had a cracked magnet. Probably caused by heat. Check that the cooling fan to the magnetron is clean and unobstructed.
Thanks for posting this great information on the magnetron.
magnetron could still be faulty with perfect magnets and resistance checks if it fails
Good one thanks
Your Welcome.
Thank you Jim for your video. I have a Logik macrowave. It stopped heating and when I checked, the magnetron was missing. The worse part is I don't know the type which was there and I intend to replace it. Which type do you think can be compatible?
There is a model number located some where on your microwave. Front panel inside the door or at the back of the unit. The model number will be printed some where on your microwave. You need that model number to get the right magnetron from your parts supplier.
So in your earlier video - you showed that the Magnetron checked out good ??? Ive also seen other videos that showed how to test like you did. I replaced my Magnetron several months ago and all was well. Recently my microwave stopped heating again, so I blindly replaced the capacitor and diode thinking that would do it - NO heat.. went through and did all the checks this time and all switches are good, fuses etc . any idea if my Magnetron could have went out that quick ? Also you never followed up on your Transformer check?
The Magnetron did check out good in a previous video using a multimeter. The magnetron didn't have any silver on the end of the magnetron even though it checked out ok with the multimeter that was the problem with my magnetron. It is very possible that the magnetron went again but there must be a warranty on the replacement magnetron. I purchased 2 new switches ( 2 switches are the same one is different ) and tried the new switches to be certain it wasn't the switches. I would see if they will replace the magnetron if its under warranty. Check the end of the magnetron watch the video again you will see there was no silver on my magnetron. I did try the transformer check but it was hard to get a reading on the body of the transformer the coating was hard to scratch off so I never completed the Transformer check. There are other detailed videos on the actual transformer check. Let me know how you make out. Thanks for posting.
Good
Thank you
Thank you nice video and info. Mr. Jim please tell me that CAN WE REPLACE BAD MAGNETRON WITH GOOD ONE OF ANY MICROWAVE OVEN ???
No , you have to replace the magnetron with model that was designed for your microwave.They are designed to operate at various frequencies and output power levels.
Thanks for the information. I have a Logik macrowave and I just discovered that the magnetron is missing and I don't know the type. What can I do?
What difference would the Multimeter test do if it didn't show any difference between. The new and old one?
It was a different problem that's why it didn't show up on the multimeter,
@@JimMcLaren1950 what was it?
@@zachdecker9516 Check 545 there was no silver on the magnetron.
Very informative and simple instructions
Thanks Ramesh.
I have the same mag 2M246, and a 2M248 do you think they will interchange, both are the same physically.
I would check with the manufacturer or via appliance place to be sure.
Very helpful
Thank you
Good man
Thank you.
Make sure those screw are tight, I have noticed in the newer models the mag has safety hangers and tabs to prevent it from coming loose and falling out.
Good point Vernon. Thanks for posting.
I doubt even a half percent of the viewers have any idea about the specifics of “discharging a capacitor” - “just get some insulated pliers and stick em in here” doesn’t cut it; I’ve shorted out far too many things in my life to take such a casual approach…
I mean…c’mon!
I heard a repair guy say if you replace the magnetron you should always replace the diode on the capacitor. I replaced all three for 50 bucks.
Thanks for posting. Wow $50 bucks that's a good price for all those components.
you should check the high voltage diode too
Thank you. I did check the high voltage diode in another video. ua-cam.com/video/CjD1I7ai8xk/v-deo.html
What setting on the multimeter do you use to check the magnetron? 20o, 2000, 20K, 200K or 200M ?
Ohms scale.
if you have auto range style, it won't matter. Otherwise manual setting of 200 or lowest setting is fine.
My magnetron had 0 resistance, connector was burnt. Cheapest used magnetron was 20 (smaller one from different model) I bought used microwave for $20 on the same day. Check craigslist first before you spend a few hours diagnosing/learning. New magnetron is definitely same price or more expensive than same type used microwave.
My old microwave, I was trying to repair, was rusty, ugly and turn table didn't work for 15 years! Good luck, guys!
BTW, magnetrons die if there is no food inside
Thanks for posting. Very good point " Magnetrons die because empty " .
On thing I learned and might be good info: turntable not running is similar to no food inside since the microwaves might not get absorbed by the food as when it is turning. Thanks for the comment!
What is the cost of magenstron?
hello mr jim mc laren pls advice me what to be done of my microwave oven, the problem is power is on but the unit is not working at all ,despite of touch push button being press. this is what ive done, checking and inspectio with my digital multi tester, fuses, magnetron, diode, capacitors, transformer, and the micro switch in the door contact, all the inspection and testing being done but the problem is still exist, by checking the main components are base of what I viewed from tutorials in u tube. please help.
When you press the button on the panel does that work. Example you press 30 seconds hit start and nothin happens .
If you press the panel button and nothing comes on then you may have a loose ribbon cable on your panel.'
If there is no heat check that there is silver on the end of the magnetron.
Do you need the same magnetron model?
I got my magnetron at the parts store. It has to be compatible with your microwave. So you cant take a magnetron out of a different microwave or model,
My microwave is heating but very low. The quantity of water which was taking 1 munute earlier not the same quantity of water is taking 3 minutes to same temperature. Is it time to replace magnetron or is there some thing else? Please suggest.
Take a look at the silver you have on the magnetron. In my video there was very little silver and would not heat. Maybe you have some silver enough to heat but slower. time.
Only thing is the magnetron is expensive to change.
@@JimMcLaren1950 thanks
Would a bad magnetron cause the microwave to act as if it's not even plugged? Mine is completely dead and the main fuse checks out fine with the ohmmeter. Any ideas?
In my case it was the end of the magnetron that was bad.( no silver on end ) . I had power to the turntable but would not heat.Some microwaves have 2 fuses inside the microwave case.
Microwave ovens also have a thermal cutout. When our Panasonic magnetron failed it took the thermal cutout with it. Very simple to check and replace only 2 wires.
So what happens exactly. Oxide layer forms or silver explodes off?
I'm not sure what happens but if there no silver on the magnetron it wont heat.
I have a 2004 gold star which is LG microwave. A friend of mine who works on microwaves was replacing the magnetron but, he never came back. He has already installed it but did not hook up the connectors. Is there a certain way the wire connectors have to be hooked up to the magnetron and, if there is, is there a video that shows this? Nobody knows what happened to him.
Watch this video should be a plug that goes directly into the magnetron.
there is small cotinuity which is bad, thanks for that
Your welcome.
How do you discharge a capacitor
By using insulated needle nose players as in the video.
Whatever the color of the magnetron antenna, mine had a big hole melted in the side. I expect that means the magnetron is bad. It is definitely worth checking the antenna on a device that yet tests good on the meter. Many, many thanks. The replacement costs $268. We wlll probably buy a new microwave.
Is it possible to check the magnetron by simply taking off the upper grill on the microwave oven and using the meter? A tech came and that's what he did and determined it needed a new magnetron, capacitor and diode.
It depends on the microwave, yes it is possible. Usually each part is removed and checked with a multimeter.
lloyd mitchell says
excelent .you work like me i really like this video
Thank you , glad you liked the video.
Sir is there any way to find the polarity of an magnetron
Just pay attention to where the power wires are connected, and plug them again the same way.
Snap a picture before dismatelling any thing
Circuits are also available
be sure to fix the capicitor and diode in right way otherwise your main fuse will blow immediately
I am not sure but I think it doesn’t have a polarity.
I would check first the high and low voltage on the magnetron. If I find high and low voltage present then it is sure the magnetron is dead.(consider that, it is a shorter way to find the problem)
Thanks for posting.
Yes it is the proper way but the problem is this a handy man dont have high voltage checking meter our multimeters max range is 1000 v ,unless you have pro meter how can you check coz it is a doubler circuit .the magnetron works as vacuum tube it has filaments it has high voltage it generates frequency. The only way is hit and trail you are correct sir.
We’re do you buy a new magnetron
You can get them on Amazon.
Bought mine thru local parts store for applances.
How much is a new magnetron in pounds uk
30 ro 40 pounds depending on make.
Did your microwave start getting louder making a humming vibrating
noise before it died. I suspect the
magnetron is starting to go in mine.
Could have been a bit louder don't recall just remember it didn't heat. Could be the turn table there is a small motor under the plate that went on mine. That one was under warranty. Some how this post got duplicated.
@@JimMcLaren1950 Thanks for responding. Our turned out to be a busted magnatron.
Hi Clint, thanks for posting. So the humming noise was an indicator.
Don't use the number on the label inside the door of an LG. That's the part number for the label! I did find it that way by back cross-referencing. The right number is on the label on the back. :)
I had the same issue. The magnetron checked out okay via multimeter, but it was indeed bad.
I replaced the magnetron and the diode and the capacitor. It’s still making the buzzing noise and not heating.
What else could it be?
I would have thought with all the changes one of them would have solved the problem. The other would be to check your micro switches.
@@JimMcLaren1950 yep, after replacing the magnetron and diode and capacitor I ordered the 3 pack of door switches and did all three. No dice!
Just went and bought a whole new one, installed it and it’s working perfectly. $400 later… what a bummer. But I tried!
@@dadthefixerflorida Its not knowing what would bother me.
@@JimMcLaren1950 yes it does. I feel like I traded my man card in for the easy fix.
But it works now. Lol
@@dadthefixerflorida I hear what your saying
What was the issue
Discoloration on the tip of the magnetron. Once I changed the magnetron it worked fine.
what happens if i install a 2m246 magnetron instead of a 2M226 one?
I would go with what the recommended model of Magnetron. Check with the supplier.
I replaced it and it worked great! Checkout the video I'll upload to my channel to see!
If magnetron bad you should read short between terminals or short with casing
That is identical to my GE microwave
Hi Jim, I found this video extremely valuable. One question I have is, what type of screwdriver are you using? I knew about magnetic ones, but I noticed you were rotating your wrist without letting go of the handle, so it must be some feature that lets it go only in one direction? I didn't know those exist!
Pat, the screwdriver I used is the Wera Kraftform Kompact 27 RA 2 available on Amazon. I did a review of this screwdriver ua-cam.com/video/JMFkZ8A9zq4/v-deo.html
my magnetron keeps burning out, what caused it?
Did they give you the right replacement magnetron
Check your power supply.
@@JimMcLaren1950 i think i found the reason. it's the magnetron waveguide cover. the previous one was burnt and I did not replace it so when I replaced the magnetron that burnt out cover sent spark back to the magnetron.
@@Kdatoh3 Good find on the reason your magnetron.
I changed out the Magnetron bit still no heat 😢
Check my other videos.
Wish I had seen this video first. Have gone thru my whole microwave...all parts testing good, except the transformer...it was shorted and blowing the internal fuse. So, I got a new/used transformer that tests good with 102 ohm running thru coil. I installed it, microwave runs now without blowing fuse, but still loud hum and no heat. Bought a new capacitor...still no heat. Now, I see this video. Oh well. I dont think the wife is going to let me spend any more money on this micro. But, I am guessing either, that the magnetron pulled too much current when it quit and shorted the transformer, or, lightning ran thru the microwave. All I know, is everything else on the microwave works....fans, lights, turn table....just, no heat.😒
Sounds like the magnetron. You replaced a lot of parts its like new now. I would be tempted to replace the magnetron.
How much did the magnetron cost?
I had to buy it from parts store which cost more . I believe I paid $70 Canadian. Probably cheaper on Amazon.
Is it true that a disconnected magnetron holds a huge amount of power.
Is it safe for me to try and change the bulb myself ?
I am not a pro.
Yes there is still power there even after unplugging it.
I would look at other videos on how to change the light. See how they deal with the power.
Depends where your light is located.
My bulb was beside the Magnetron so I had to take the cover off.
Check continuity with multi meter.
Thank you Tim, I will check that.
A Ha! You said "As long as you don't get all zeros". I know in testing a magnetron there should be less than 1oHm between the contacts. But what I there's absolutely NO reading at all?
You should get a reading.
Right, SOME sort of reading. If there's no resistance or no reading it's bad...There's no continuity to the case from either terminal, but the resistance between is 0.
Mine is measuring 5 ohms between connectors, is that normal? Microwaves not heating
Mine was around 4. I would check for silver on the end of the magnetron like in my video.
⚡Will I get electrocuted? My sister is freaking me out.
So I just have to discharge the capacitor with insulated plyers? ⚡⚡ I have the new part ready to go. HELP!! 😳
Yes your sister is right. You have to make sure you have insulated pliers to discharge the capacitor .
I had my microwave unplugged for several days and still used the pliers.
Be very carefull. Very dangerous.
@@JimMcLaren1950 how do I know if it is fully discharged? Thx for reply!!
@@kartencarter8135 Check out this video ua-cam.com/video/3L-_ROmtLUo/v-deo.html
My microwave works fine if you don't put it in for more than 2 minutes if you put something in for over 2 minutes it only makes it look warm why is that
Check your power level. Usually is set from 1 to 10.
I think you bought some bad part or you don't check well! Ajajajaja
The magnetron was checked out with the multimeter and checked out fine. It was the end of the magnetron that had no silver on it that was the problem.
Cody of a magnetron
Cost of a magnetron
How much dos a magnetron cost
Replacing a magnetron
How much is a magnetron for a microwave
I've got a Anko 34 litre microwave made in China it had very little use, it's just less than 2 years old and it's magnetron went, it will probably end up in landfill, ill never buy Chinese again.
appliance.academy
Did your microwave start getting louder making a humming vibrating
noise before it died. I suspect the
magnetron is starting to go in mine.
No didn't hear any humming or vibrating sound. Yes check Magnetron. Check with multimeter like in this video and check for silver on the magnetron as well, also mentioned in this video.