I was following along, and getting ready to fix my microwave. But when he said, this might kill you at 2:20, I backed out. 😂 😂 😂 😂

HV Diode have several diodes in series in order to have a HV rating. A multimeter diode tester is only good for a single junction diode with a forward junction drop below 3v to 4v. Use a 9v battery in series to do a HV diode test.

Some capacitors have a resistor inside (10Mohms) that safely discharges them in a few seconds. Also, the high voltage diodes can't be tested with a regular multimeter alone. They need to pass a higher voltage than what the multimeter can offer, anything more than 9V. The multimeter will test the voltage going out of the diode: forward it will drop around 5V, and won't drop anything in reverse.

This is the most helpful video I've seen so far because it is the same problem I am having, loud noise and no heating. You are a resourceful guy!

Testing a high voltage diode is not as simple as using the multimeter's diode test function. It showed open circuit in both directions because the multimeter's voltage is not high enough to overcome the voltage drop of the diode. Here is a video that shows a way to measure it with a regular DMM: ukposts.info/have/v-deo/aaChaIKMqadlpYE.html

Background fact to the Microwave oven we so take for granted these days: British scientists were developing world leading radar before and during WWII. Its how we managed to defend our islands for so long when we stood alone with our commonwealth friends like Canada, Australia, New Zealand etc. The long wave radar was only suitable for land or limited sea use and impossible in the air and so short wave radar was developed. The British designed the 'Cavity Magnetron Radar' for these uses. However the pressures of war made manufacture slower than was needed. In 1940 and (and again in 1941) Missions were sent to the USA with Canada's involvement, as the ship (RMS EMpress of Canada) docked at Halifax, under the direction of one Henry Tizard. The idea was simple - Give a neutral USA advanced technology and in return they will let us buy their production capacity and win the war. Amongst the technologies given were: The proximity (VT) fuse Self sealing fuel tanks Atomic fission The Jet Engine Gyroscopic Bombsights Advanced Sonar Plastic explosives And of course 'Cavity Magnetron Radar' which the American historian James Phinney Baxter III would later call "the most valuable cargo ever brought to our shores". It re-defined advanced (and mobile) radar and brought significant advantage to Allied air forces especially in the battle against U Boats. Canada had benefit from this as Tizard met Canadian George Laurence who was developing steam power from nuclear fission. The British Government directly funded his research and gave him access to their research as there might be some use after the war. Which there was of course. So something that is now so simple, taken for granted and has had such a beneficial effect on our daily lives started out as a means of advanced warfare and was gifted to the world by a nation fighting for its very survival.

Good job! Thanks for sharing your experience. I now have better idea of what I have to do.

I liked your presentation - excellent!!! Thanks for making a video of your work to help us. I liked your aptitude on fixing and not throwing it away. Great work. I have my OTR microwave, within one year of purchasing it brand new, started blowing fuses just within a few seconds of running. I have not thrown it. My previous one lasted 12 years. This one is almost new, and I am planning to check the status of the capacitor (I know deadly, will remember to discharge it) as well as the thermal fuse.

@Elin Yakov's Rusty Beauties. Hey Elin, our GE microwave is doing the same thing that yours was doing. Before I found your video, I happen to have a bag of microwave popcorn here, so I put that in and tapped the ''Popcorn'' button and it went through the heating cycle and when it beeped the usual 3 times, it read ''Sensor Error''.... So far the only answer I found in a google search was a door switch could be bad, or something else I read said the ''Humidity'' Sensor could be bad but because it sounded just like your microwave, I am going to check the diodes first. Thank you so much for making this video. I'll check out the diode tomorrow....

Great job you have a great sense of humor I missed the swaring. LOL I have one to fix with the same symptoms.

9:32 Those caps have a internal 10m ohms resistor. That is why they usually discharge quickly. Still >YOU SHOULD ALWAYS< do the discharge procedure because if the cap still good while the inside resistor opened the cap will not discharge quickly and will zap you to death.

😂 I practically held my breath while you were working on it

I had a Hamilton Beach model P90D23AL. Everything worked, but the mag would not turn on. I did the easy checks first: the mag-circuit (diode, capacitor, fuse, mag filament, connection to transform HV coil). There were no improper shorts or open circuits. The diode tested well. Then I checked the transformer primary for continuity or shorts. No problem. The HV secondary was 150 ohms to the case. No problem! I suspected that the door interlock that controls the mag was faulty. Now, the struggle began. They snapped-in when connected, and I could not remove them with ordinary tools (needle-nose pliers). I concluded that they were not made to be easily removed. I tried to remove the interlock switches with the leads still connected to them. They were held by plastic retainers that I could not pry out of the way. UKposts has several videos on the magnetrons and other big components. What we amateurs need is advice on how to remove those snapped-in connecting lugs. That, to me, is the hard part.

That was great Elin! A $13 diode saves a perfectly good Microwave oven that most people would just “dump” and buy another new one ! (I bet all the Microwave manufacturers will REALLY hate you for this ha ha!) thanks buddy 👍👍

Mw diode have a big resistance that it cannot be tested directly using a multimeter , you must used a 9v battery to polarised it then connect diode with battery and multimeter in series for testing

one of the best explained video's I have seen thank you, you are credit to you tube I have also subscribed

That's what we call a "zero sum" game....one fixed microwave, one sacrificed microwave....net result is the same as before you started ;-)

Thanks bro this video was very helpful..

My microwave has the same sound. I already bought a new one, but I will try and fix the old one the same way. Thank you for sharing.

Thanks man!

Are all magnetrons standard in power, voltages, watts and ohms, etc., and can be used as replacements in any microwave oven? I'm trying to repair my microwave oven which is just about 2 years old, and the magnetron has stopped working. It's one of those that has a static (hot) plate - not the rotating kind. Can I use a magnetron from a rotating plate microwave oven to repair mine?

Thanks for your Video, Hope this Will HElp me Fix Mine! God Bless!

Great explanations!!!

My Oster Microwave starting doing the same thing yesterday with the loud humming type noise and no heat. If the diode is bad on my oven and I replace it how do you know which way to put the diode on being as they are one directional with the current as to avoid having it on backwards. Hoping my oven is only a diode also and not the Magnetron or Cap. I have a voltage meter so I can test the diode. Not sure how to test the Magnetron. The Cap I know how to test. Thanks in advance for any help. Philip Jersey Shore area

Cheftush did a great job building this, you can’t see any weld lines!

The capacitor has a 10 meg ohm resistor across the capacitor terminals internally for safety. That is why it did not spark.

Hi fred..ive got a ge microwave thats not heating...when i click start the fan turns on table turns..i hear a click relay but no hear normal humming sound anymore....i checks diode and is ok...i check door limit switches ok...what other part could be the issue?...the hv cap is not bulged on top

i just saw this and i have the same sound and im hoping its the same fix as just that diode not sure since the big fuse blew and that didnt fix it and still makes the same loud sound but well see :O

Very informative sir, but sir I do have a question how do you replace the cables you have discharged from the capacitor coz you said that you have to be careful when discharging the cables so what about replacing them back there is no problem I can use my free hand it's not dangerous or what coz I am I beginner in these things sir

Good job ! Thank you for your problem-solving approach and down-to-earth explanations.

thank you for sharing. i have the same problem. i'm going to give it i try,

Good video and funny , I have the same problem Thank you that was easy to fix my self👌👌👌

Thanks. Good and helpful.

Thank you very much.

Wow! I’m so happy you fixed it. I felt bad after it crapped out on you after 1 use! Good for you! 😎

i love this guy

It’s a good video and I’m just going to joke around so don’t get upset. He doesn’t have all the tools but he’s got all the tools he needed.

Awesome video!!!! Great explanation and walk through on it's repair!!! I also love the fact that you had me laughing while watching it!!! The victim microwave comment was priceless!!! I'm going to repair mine. Thanks!!!!!

Just fixed a Samsung above range microwave. It was the magnetron and also the diode I think. Replaced both and now it works.

Great video man, entertaining also!

Thanks. Fixed mine too.

Microwave oven doors have microswitches. These microswitches sense if the door is open or closed. They are in part mechanical and will fail. If all else tests functional, the door microswitches may be the culprit.

The big screwdriver seems to be anodized, and won;t work well to short the capacitor! Just use the pliers to connect the terminals.

Chef Tush called, He wants his machine back.

Thanks, that's exactly what our microwave is doing; loud noise, no heat. I'll try the diode.

Where can I buy the diode & what type of diode? Thank you.

Thanks! Great video. However, my best choice would be to get a new diode, indeed!

The high voltage Diode used on microwave ovens can not be effectivly tested in this manor due to there very high internal resistance , if you use this method it will "allways" test open in both directions , The High Voltage system in microwave produces absolutly lethal high current high voltage power so one must follow proper service procedures or you can seriously injured or killed you can not take any shortcuts when it comes to protecting yourself , most microwave oven capasitors have a drain resistor "But" one must allways assume cap is charged and discharge it properly accross a resistor, shorting it out can damage it due to the very high current flow ..how to make a discharger ukposts.info/have/v-deo/qIZ6im9nbKeT2mQ.html , as spoken about below one must use good 9 volt battery in the diode test process ukposts.info/have/v-deo/iJSolqCFeoFe2as.html . allways make sure the mica waveguide cover on the inside of the microware where the microwaves enter the cavity is not damaged by burnt on food a damaged waveguide cover will refect microwave energy back into the magnetron , replace it if it is ..

Well well well. Seems it goods now This morning I just check a microwave which is not power on. I check the 3 switches on the door its good. I check the fuse that's also good. I check the power. That's also is good and it's coming into the microwave. But it's not power on. Finally Loosing hope I say let's check the board power supply. So what I see was really shocked me. 2 lizards completely burn on the power supply board. So I did have some power supply board. And I found 1 the same which has been burn. I change it well its looks fine No blown up fuse or Chock sound. And it's working.

You are THE MAN. Leave some women for the rest of us! :) - Paul

He could have used the pliers to short out the capacitor.

Loved the cooking glove😂

Please suggest the price of fixing too

I have the same issue, my microwave is not eating at all... I don't wanna replace it because the it is convectional oven still working. Heating food is just a problem

A HV diode will not be forwarded biased by the diode setting of a multimeter. You can test them with a 9v battery BUT my microwave failed, making the same sound/not heating & it WAS the diode. It passed tge 9v battery test but neither was it open circuit. It was failing when reverse biased & wasn't actually rectifying at all. $10 later or a new diode & it's all good. My guess is that your diode had the same fault.

naaaaice !! 👍🏻👍🏻

Hi, Thanks for the great video. I have replaced just the diode, it was working good for just 1 day, then again got the sparks and stopped heating. I don't know why the new diode died soon. Do you think the old magnetron damaged the new diode? do I need to replace the magnetron too?

Use a rubber handled needlenose pliers to discharge the capacitor.

Great video but unfortunately when you take a microwave in for repair it costs half of a new one, l just replace even though mine looks perfect it’s 17 years old. Sharp are very good ovens.

LOL. I really like Russians for their gutsy moves and attitudes, get-it-done ethic to see it through.

My symptoms are the same, wife is thinking whirlpool deals for whole new unit. If it's the diode we trade it in and somebody gets a good MWV for $10.

The high voltage diode will measure open in both directions with a normal multi meter. Even a good one. To test it properly you can either use a Megger or as per the video link posted by Nabzim further down. I prefer using a Megger. Its quick and easy.

SIR, II HAVE GE MICROWAVE AND AFTER SWITCHING ON IT SHOWS COMPLETE DEAD, NO LIGHT IN FRONT PANEL I HAVE CHECKED ALL PART WITH MULTI METER SETTING ON CONTINUITY MODE AND FOUND TO BE OK. EVEN OPEN MANETRON AND FOUND TO BE OK. DOOR SWITCH, RELAY OK. MAIN CABLE OF MICROWAVE IS ALSO OK. WHAT METHOD SHOULD I FOLLOW SO THAT ELECTRICITY PASSES THROUGH MICROWAVE? THANKS.

There's also Fuses in there also

Tried this and shocked the hell out of myself got the microwave working tho

What color are you going to paint it ?

8:44 Orr ohh! lol

just pull out the diode, then the cap is disconnected, just dont touch the terminals of the cap, which is most unlikely

A tip to everyone, to discharge a capacitor you just have to put any resistor across the capacitor. Problem solved no sparks, the resistor will drain the capacitor to 0V.

What if microwave has no diode

This is not the method to test HV diode. You need a 9v battery and test for forward bias voltage drop.

A "Popping Noise"? Whoa ! Backed Me Off But Good ! That's Above My Pay Grade ! I Need An Expert !

DIOS CAN MAKE MICRO NOT HEATING

How to magnetron

Can I use wire if I don't have the fuse

I just got one and it has tons if noise but doesn't heat up shit, any solutions?

Wrong, the multimeter will not check these diodes.

Very Good!... #92 ✝ {6-5-2022}

My microwave cost $500 bucks, I want to repair mine that quit heating but powers, works and sounds normal with no heating.

🤣🤣🤣🤣that slow motion turn to the other microwave for parts

not how you test HV diodes bro,even a brand new diode would still give same results if tested that way,rather use a 9v battery

I don’t see you what you fix

Hi super maestro on spjegat

Zegbolor

Sooo…..just get a new one…..

You look like Roman Reigns

First!

well, if youve unplugged it, no need to discharge

John 3:16-21 16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. 17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved. 18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God. 19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil. 20 For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved. 21 But he that doeth truth cometh to the light, that his deeds may be made manifest, that they are wrought in God.

You have to stick your finger across the capacitor terminals to discharge it. Hold your man-bun with your left hand while placing your right hand on the capacitor and see what happens.

You talk too much