Panasonic Inverter Microwave Oven Repair

[@JatinderSingh-cs8dt]

Thanks man, it helped me. My microwave was dead, I opened it up and checked fuse but it had continuity. Before anything else I just cleaned and placed it back and guess what, it work fine. It just had some dust or build up around the the fuse, cleaning it helped. Thanks.

[@JAndrewHall1]

Great video. I thought my microwave had just blown the fuse. But, discovered that it's primary switch had literally burnt itself out (actually melted the wire connector). Thanks to your video, I was able to replace the fuse, the switch and the connector and save myself a couple of hundred dollars! Cheers!

[@BN-mg4ix]

That sounds similar to my problem....

[@bertmyles9483]

Where did you buy the parts? Would you happen to have the part numbers ?

[@tonyend2001]

Thanks for this video. My Panasonic NN-SN686S would stop after about 3 seconds. The continuity for the 3 door switches tested OK, but I noticed some electrical residue on one of the switches, so I replaced all 3 switches, which resolved the issue. The cost was $40 from the Panasonic site.

[@aruarunasalam5391]

Thank You. This is a very well explained video and I was able to check the 3 limit switches and then replace the fuse. What I did find out from a different video was that the limit switch and fuse replacement part numbers (CES6) are actually written in red on top of the inside cover - this is visible as you remove the outer cover. This and the other video on the same subject by 12voltvids were very useful to also understand how to go about doing more complex repairs if one chooses to do so.

[@tunlai]

Plse advise.. My Panasonic Microwave turn a little than STOP. I have already replaced the turn table motor. Hope to hear from you soon. Thanks.

[@ramkovilvila3878]

Great Video. My 7 year old Panasonic went dead recently, ready to throw out. After watching your good stuff, I opened it up and found the shorted switch. After removing the shorted microswitch I was able to make the unit work again! This will save me a few hundred dollars at least for now. Thanks a lot. I would even offer a small donation (may be $10) to your website as a token of appreciation. Please let me know.

[@12voltvids]

PayPal. [e-mail]

[@matthewbestdfghy]

Its amazing how a lot of the mirowave ovens from the 1980's are still working. Specifically the one from work that i use almost every day and the one that i have at home.

[@12voltvids]

Yes I have a Panasonic madam grill that goes back to 87 or 88 still works.

[@12voltvids]

The old ones had basically 4 parts. Transformer, Diode, Capacitor and Magnetron tube. Plus the interlock switches and timer of course. Inverter units are much more problematic especially the early ones from the late 90's before they figured out how to make them. The new ones are far more reliable. Many magnetrons files on the early ones too because they were being over driven.

[@mickeythompson9537]

Yes, I have a huge, third-hand, 80s one that still works, every day. (I don't have children though...)

[@Maxxarcade]

I trash picked a Quasar Custom Touch about 20 years ago that was made in 1984. Cleaned it up and it's still working to this day. It's outlasted several newer microwaves, so I keep it around as a backup unit.

[@mrmike1972]

I think the date code on mine is 1986, it's only 500W though, have to double most "regular" cooking times.

[@nate5520]

Hi my Panasonic inverter nn-sc668s just stop heating. Runs normal but I can hear intermittent clicks every few seconds. After a 2min run it shuts off after 45 secs and does not heat. Any ideas?

[@glendonkumseun2525]

Thank you very much for this well explained tutorial! I managed to fix my Panasonic inverter microwave by just replacing the fuse. It was more difficult mounting that microwave back up by myself than replacing the fuse that’s for sure!

[@destineydevereux7355]

Did you have to reset a code??

[@dong_chim]

Thank you for this video. It helped me fix my NN-T795SF with a Oct 2006 build date! In my case, the primary latch NO switch had failed and was functioning as an NC switch. The button also no longer clicked. The door was not making good contact with the button due to wear, causing it to "stick" closed. The fuse would blow whenever the door was opened. Tip 1: It's a lot easier to see and work on the switches if you remove the latch assembly altogether (just disconnect harnesses and undo two screws). I found it helpful to see and understand how the door latches and release button engage the switches too. Tip 2: there's a sticker on the underside of the cover panel with the part numbers of the switches, relay and fuse. My model uses a 6x30mm 20A slow acting ceramic fuse.

[@pavlobesedin1562]

This video helped me! My machine started turning off after 2 seconds of run time - fuse was good, but evidently it made a poor contact with the board. Took out the fuse, brushed up the contact pads - then good to go!!

[@DrewskisBrews]

I love the concept of inverter microwaves. An inverter will be the next kind I buy. I am one of the three people who actually uses the "power" controls on microwaves. Instead of cycling the magnetron in "duty cycle" fashion, the inverter- style does it with some kind of HF PWM. Way more useful for actually reducing the heating power of the unit.

[@12voltvids]

Yes inverter by means of pwm will vary the hv to the magnetron and thus reduce the power. They work great.

[@DrewskisBrews]

@@12voltvids hope the skin is still attached to your hand 😳

[@12voltvids]

@@DrewskisBrews The big one I have in my kitchen the fan also slows when the magnetron comes on. The reason this one was so noticeable is because the cover was off. When the cover is on didn't spin down so much as it was actually working the air rather than just spinning. And no, it doesnt cool the fuse. It directs the air over the magnetron and inverter heat sink and then into the oven cavity and out the other side over the humidity sensor. When I ran it with the cover on the sound of the fan speed dropped about the same as my other one. I'm giving it away so if it blows up again oh well they got what they paid for.

[@doddgarger6806]

Basically achieves the same thing and I think the older style is still more reliable

[@chazdesimone7306]

There are four of us. I find the lower power levels very useful. (But I'm also one of the few who likes fruitcake.)

[@tookitogo]

I’ve had several Panasonic microwaves (none ever failed, I only replaced due to moving overseas and then upgrading to a larger model), including a very similar one from just a tad earlier than the one in the video, and none have had fans that spin down. I wonder if perhaps the fan is failing, and that the fuse blew because the fan was unable to keep the electronics cool enough, including the fuse itself.

[@russellhltn1396]

I suspect the fan slow down is due to the voltage drop on the line as the inverter comes up to full power.

[@Watcher3223]

My family had a 1982 vintage Panasonic Dimension 3 (named as such because it offered microwave, convection, and combination microwave and convection). It wound up getting thrown out, but not before giving us over 30 years of service, though we never did use the convection oven operation, nor the combination convection/microwave. It was built like a tank, but it got to the point where it was too worn out; the turntable belt got stretched out and the magnetron became too weak to cook efficiently.

[@larrycarter3765]

I can't even find the fuse on my NN-SF564w model. & how do you get the cover back on?

[@oscarclay1682]

I've got a similar Siemens HF26026EU inverter microwave that has no display. Fuse is tested and good. When I plug in the power there's no display and it won't run. If I open the door the tray motor runs. Could bad switches cause this or is the main board also bad?

[@stphinkle]

Could a failing component in the display driver circuit or its power supply have been what initially popped the fuse?

[@12voltvids]

No definitely not. It is an 18 amp fuse, they just fail some times. The problem is the fuse holder. Heat generates between the holder and the fuse, and over time this weakens the fuse. I have seen this many times on many things, including my electric car charger.

[@zappafan3473]

i have a Galanz that died. I figured out it needed a new thermal fuse, so i ordered and replaced. Now, when I try to use it the convection oven part works fine, but the microwave oven turns off after 2 seconds with an ER30 error which is a communication issue between the inverter (power transformer) and the control board. is this something I can reasonably address and fix myself? Many thanks!!

[@John-bl2uu]

Nice video- how do I find out the size varistor to replace on a 1200 watt Panasonic unit?...

[@AricVogel]

My parents recently had to replace our old Panasonic Inverter from around the same time period (early 2000s). Not because of the electronics, but because the plastic door opener mechanism broke from so many years of heavy use. Not bad if you ask me, that thing must have been going on 15 years or more, having spent most of its life in a house with three kids who may not have been too gentle with it (myself included). They got a brand new Panasonic Inverter to replace the old one, and I'm expecting it'll last even longer than the original.

[@avanola2612]

same thing with mine, and although im trying to get it fixed, repairing the broken white plastic bit is not stocked any longer so i dont think its worth the bother. and my time as my Panasonic is also about 20 years as well i should imagine

[@spededucation8564]

How did you go with a new Panasonic? Mine crapped itself with constant h97 errors after just a few years of light use. Absolute trash.

[@DannyWoodburn]

I have this one and it seems like the initial issue you are referring to--the switches is the problem. I'm going to get another because getting a repair guy to work on it will most likely be too costly. Its not dead bc teh light still comes on when we start it. But the door has been a issue. sometimes the door will close properly and let it run and other times it does not. It has been nuanced dance of door shutting to get it to run but now it is over. You wan it?

[@dillonle4034]

Mine microwave every time I plug in power it counting P10 to P1 for two minutes then nothing works. Do you know what happen?

[@gfernandez9682]

Any idea on how to clear a power countdown on a Panasonic NN-SN966S? It beeps, then starts a countdown from P10-P1 then 4-'s across the screen.

[@umajunkcollector]

Sometimes when you slam the door on my Panasony M O, it totally loses power, slam it again, it comes back on. It's like a loose power connection. I never opened it up. You didn't mention the HV oil filled cap, could be worse than a CRT. POP

[@12voltvids]

No oil filled cap in this one. Inverter type, just very small ceramic caps.

[@12voltvids]

Speaking of the secondary of a microwave. I can tell you from first hand experience don't touch it when it is operating. Threw me about 6 feet through the air.

[@timboslice4019]

So, being from the UK, is this the same fuse that is in the plug? Or is there another fuse within the microwave itself?

[@thomaskeithriehl]

Noticed you didn't power down the capacitor and just went right in. Is that not a problem?

[@HowToDoitright]

So I’m confused. You said water is bad for microwave and you put water mug to test it?? My microwave is acting weird. We have a new born and we started heating water in it to heat his milk from hot water and now the microwave sometime works and sometimes shuts off. If we wait, power cycle or hit it it starts to work and sometimes it’s doesn’t work at all. What could be the problem?

[@12voltvids]

I never said water is bad for a microwave. A microwave needs a load to absorb the microwaves. Water is a perfect load.

[@chrisn7632]

Thank you 12volt, my not so old Costco Panasonic microwave model NN SC668S quit working and sure enough it was the top door switch at fault. Lucky for me I saved the door switches from a dead Sharp microwave I recently scrapped and the top switch was a perfect replacement 👍❤

[@chrisn7632]

For anyone who needs the top switch part number it’s KW3A which sell for about $5.00 online. Mine was obviously bad because the little button no longer stayed up. The defective switch was made by Dongnan so maybe a brand to avoid. The spare I had is made by Starion. Good Luck 🍀

[@thorhedderich]

Hi, I received a Panasonic SN 686 S inverter microwave to be repaired and was wondering if there is a power supply schematics just to check the components value before attempting to remove parts to be Checked outside the board. Thanks for the help.

[@12voltvids]

I have no source for any info on anything.

[@matthewmitchell60]

What did you do to yours where they boiled water in it how did you fix problem

[@old64goat]

I never heard of an "inverter" microwave. Does that mean it does not use a high voltage transformer? (MOV)

[@12voltvids]

It uses a "flyback" type transformer to generate even higher voltages. Conventional microwave ovens operate around 2500 volts. The inverter units run closer to 4100 volts. More volts means more watts. A conventional microwave might have 700 or 800 watts, while the inverter models will put out 1250 on high power. The advantage is power control. On a conventional unit they cycle the power on and off to "lower" the power level. Basically 100% then nothing. On an inverter model, if you set it to 3, you get 30% power running 100% of the time. The defrost cycle on an inverter model actually defrosts peoperly, without starting to cook the edges. They are the best microwaves, and I would never go back to a conventional model again.

[@mrsemifixit]

12voltvids In the inverter type instead of 100% then nothing for a duty cycle, are they using different taps of the transformer to lower the output?

[@12voltvids]

@@mrsemifixit No, they change the frequency of the oscillator for the inverter, which changes the efficiency of the transformer by moving it closer or away from resonance. Raise the frequency and the efficiency drops off which lowers the output voltage. Switch mode power supplies do the same thing. The opto coupler changes the oscillator frequency to control the voltage in the secondary.

[@RanksJ93]

Hi there, I’m wondering if you could offer me some advice. I’ve watched your video and I have a panasonic nn-ct5855. Some soup blew up in there and blew the bulb. I’ve cleaned it and replaced the bulb. The microwave is still warming up food. However, there is not light and the new bulb just spins the dish in the middle when the door is open. Any ideas?

[@RanksJ93]

I’ll happily make a donation too to your website and channel too!

[@BobH7777]

Thanks for the video. It is helping me. The connections on one of the switches were burned. Maybe a bad connection? Maybe something to do with that blow the fuse function? Fuse is OK. My problem is I got it apart without good enough documentation of which switch is which. I cant quite be sure watching the video, Which position is the NC seitch? It is one of the two near each other, right? But is it the one closer to me (the outside of the unit, or is it the far one. With luck I hope I have the two NO switches sorted.

[@denryhutabarat]

My microwave (panasonic) can turn only 20 second then turn off,what is the problem you reckon? Thanks

[@markanderson350]

I have a Panasonic Inverter and the display is dim but I can read it OK. Mine is over 20 years old now. I did have the magnetron socket short out and I actually replaced it because I like the oven. It cost under 30. It failed in storage, maybe humidity. It actually shut down with a direct short to the magnetron and did not blow a fuse.

[@toyswiththechildrenschanne2051]

NTP Vlogs is my channel: specializing in sharing actual repair of Panasonic inverter microwave oven, ... you share with each other to learn from each other's experience.

[@HolliHollie]

Your videos are wonderful!!! Would you have some tips for me please? The glass door of my panasonic inverter microwave oven has become very cloudy. Now I cannot see through it, and so i have no clues about the real temperature inside and how the baking is doing. I'd like to know how the dissemble the door so that I have do a thorough cleaning. Hope to hear from you!

[@tookitogo]

Isn’t the name of the type of circuit the secondary switch is part of a “crowbar” circuit?

[@12voltvids]

A crowbar is an over voltage shut down. If a voltage goes above the set voltage of a zener diode that zener conducts and triggers an scr which puts a dead short across the power rail. There is no active components in a microwave monitor. Just a switch that closes as the door opens. The main interlock opens as the door button is pressed before the door latch is replaced. If the interlock fails to open the monitor switch will short out the mains and blow the fuse..

[@sdgelectronics]

Yes, it is

[@Eclipsemasters]

Sir, I was playing with the door (because with the years it got more difficult to open) with the oven connected to the set (I did not open the box, I only worked on the door). And I did not push any buttons. Suddenly while jiggling with the door (i.e the switches) I heard "j-j-j j-j" the light inside blinked then everything including the main display went dark. I disconnected from the set, connected back, but no luck. The display remains dark. What could have gone wrong? Thank you!

[@12voltvids]

You tripped the fail safe and blew the short switch and the primary interlock switch as well as the fuse. Nice job.

[@jj4913]

Hello, I have same microwave checked all switches everything ok only problem is start and stop/reset buttons won’t work? Any idea please.

[@Cbv1914]

So I started to have an issue with my unit saying the door wasn’t closed. I would mess with the door switches manually (while on) and first time it ended up working. The second time I think it shorted when manually working the switches and turned off. Plugged in a new fuse and it didn’t turn back on. Could it just be one of the switches needs replacement and a fuse? Or did I make a bigger issue?

[@zx8401ztv]

Nice quick fix :-D I wonder if the display has one of those odd high voltage electro luminecent backlights, they do go very dim over time, i'm not impressed with them one bit.

[@12voltvids]

I believe this one is LED backlit. Green LEDs.

[@jp040759]

If the security screws are in a hidden place I will just get a dremel with a thin cutting wheel and turn them all into flat head screws to take it apart.

[@truthtuube]

I'm coming to this party late but perhaps not so late I can't get a question answered? I have one of these inverter types which worked great up until I put it in the garage for 4 years, protected and out of weather. The time has come to use it again but I can only get it to put out 1200 watts no matter what I set it to. Do you have any feedback on fixing this? Thank you.

[@12voltvids]

Haven't a clue.

[@adamn7516]

What do you think of Farberware vs Panasonic vs LG microwaves in the $200 and under price range as far longevity and reliability and such?

[@Citizen000]

Thanks for sharing your expertise. It's made me pause before replacing my Panasonic NN-295. The problem is intermittent which makes trouble shooting challenging given it's an over the range model. What happens is that it will run perfectly than just stop. Power is still in the unit evidenced by the display still on when it stops. To get it up and going again it needs to be unplugged and then plugged in again and everything works fine. This happens frequently. Any thoughts or comments would be greatly appreciated.

[@pcno2832]

3:50 Mine blew the fuse as I was opening the door, so the secondary switch is a prime suspect. Thanks for posting this!

[@stphinkle]

Wonder if the display voltage is low

[@maty8751]

Hey, so I changed two of the door switches. but it didn't fix my problem. When I open the door the light comes on and the turn table, but not the magnatron.... any suggestions? Is it the third switch? I couldn't find a replacement easily so I only changed two switches.....

[@shoersa]

Thanks, I just fixed one that was being thrown out. Watched your video and then checked the main fuse and found it open. Microwave was made in 2015 and in great shape except dead (no display). Main fuse in mine was a 20A, guess the factory had too many of the 18A ones blowing out. Found a 50+ year old 20A fuse in my junk cabinet and after removing the old open 20A one, installed the 20A one from the junk cabinet. Plugged in the microwave and now had a display! Now the BIG question, did a faulty inverter or magnitron blow the fuse or did it just open due to be running too close to it's current rating? Put the power down to P5 and time at 1 minute & it warmed up a mug of water nicely. Success! Thanks for the great video. Saved me a bunch of time as I skipped the checking of the interlock switches and went directly to the main fuse after hearing you say quite a few have blown the main fuse with no apparent reason being found.

[@JasonHalversonjaydog]

i bought mine used 3 years ago for about $20 and i use it multiple times every day and it's worked fantastic. so i'm not sure why they got rid of it

[@parkland4530]

Just purchased a brand new Panasonic (1.3) NN-SC669S (Canada). I dont think that the unit is working properly. It seems to run alright but 1 1/2 min at PL 10 with 8 oz of water and I can hold my fingers in it. I am pretty sure our old one, which was the same type of unit, heated things allot quicker than that. Does this sound right to you? Thanks

[@alan2112drums]

Why would a thermostat blow and burn an inch of the wire to a crisp? Is it dangerous to simply install a new one, do nothing else and see if she works? I replaced the switches years ago, they are still good and the fuse didn't blow.

[@12voltvids]

Well it was probably the crimped on connector that failed. Crimps are not that good to begin with and repeated heating causes them to come loose and go higher resistance which causes heating.

[@alan2112drums]

@@12voltvids Thanks for the info. I'll change the connectors and thermostat. Much appreciated.

[@fffinga]

Thanks for the video. I have a Panasonic Genius Sensor 1300W inverter microwave that I rarely uses. Used like once per week. Since this morning it runs for three seconds and then shuts down. I tested the primary and secondary switches and they are fine. I disconnected the magnetron and it ran according to the timer. Once I reconnect the magnetron it stops after 3 seconds. Any suggestion?

[@12voltvids]

Ya, your magnetron is bad. Inverter went into over current shut down.

[@fffinga]

@@12voltvids Thanks for that. I checked the magnetron and got connectivity between the two poles and none when I check the poles to the body. I figure the filament capacitor is good so I guess the issue is way in the magnetron. Thanks again. I will give and update when I get a new one sent to me in Jamaica. Not easy to find locally.

[@12voltvids]

@@fffinga there will be continuity between the pins that is the filament. Remember this is a vacuum tube. Likely the seal failed and the tube has gone out of vacuum. As soon as the high voltage comes up it starts arcing internal and the power supply goes into over current protection. The 2 pins are polarized. One has the anode on it and the other the filament only. They are marked F and FA. You need to connect correctly or new magnetron will instantly burn out.

[@fffinga]

@@12voltvids Thank you. A lot of us are benefiting from your advice. Keep up the great work you are doing.

[@TheRainHarvester]

Can you use magnetrons from other brand microwaves? ie are they all compatible?

[@JUANKERR2000]

I find that the pins in both Torx and allen head screws break quite easily allowing the use of standard divers/bits.

[@12voltvids]

They do,but my little slot driver fits in perfectly, and these screws are not driven in that tight to begin with.

[@AbdulhaiMullick-lr7jq]

what is the number of the ic ?

[@Saywhatohno]

I have a nnsd786s and its showing "SERVICE" on LCD display. Any idea what it could be?

[@travelguy1564]

Hi - I just got a free microwave from my neighbor, a Panasonic 800 watt, made April 2002. Do you think this is a good Microwave oven? What should I look for as far as being safe to use - ? Thanks

[@pablop7872]

Sorry to inquire, I had problems with my Panasonic genius plus, I open it and check every the primary switch had a little black powder I clean and re adjust. I don’t have tools or knowledge just follow tutorials true KZbin . It works again but the fun and the lights starts on as soon you close the door, it has to open the door in order to stop this situation. I can use it normally, but if I close the door that’s happens. Do you know the issue? Also if works fixed? Is a very expensive microwave but don’t want to spend money and dealing later on with more issues, thank you!

[@ashketchum5259]

I have the exact model. The inverter went and shorted the fuse. Inverter replaced but now it takes forever to heat. Why would this be?

[@Cineenvenordquist]

Degraded magnetron performance, maybe. Panasonic got you a 1:1 replacement for the inverter board, eh? Cool!

[@johnkramer7993]

Not heating and shutting off before timer runs out????

[@chrish6001]

Good info. I've replaced fuses before. I took the cover off our older Panasonic microwave to see if I could replace the light bulb. It has an integrated lamp assembly and I don't see any available. Now I've misplaced the screws... Microwave still works really well. I'd like to get replacement screws.

[@PalardoTube]

Hi , when I start my Panasonic NN-L931BF Inverter Microwave, the timer, fan, and rotating turntable and light begin to operate but stop after exactly 5 seconds. The timer resets to start but everything else stops when the Magnetron tries to kick in. Always after 5 secs exactly. I checked all the door switches and fuses and all is OK. I'm about to pull out the Magneton Do you think this is causing the cook function to reset the oven? It is dated 2001 but I just bought it a year ago. First time this has happened. The magnetron is 2M261-M32, older than the one in your video. I don't believe the fuse is blown as it starts everytime. Do I need to replace the invertor board or the magnetron to fix this problem. Will gladly donate to you for the correct advice....Paul

[@DustySplinters]

My Panasonic NN-SB65NS just stopped working. Display is lit, all functions keys work but magnetron does not kick in. Ideas? I'm not a tech and while I have some tools, Don't have allot of electronic testing tools. THX

[@12voltvids]

Could be the magnetron. Very high voltages in there. As me how i know. 😮 One thew me about 6 feet. Microwave ovens are the one thing that make me nervous.

[@DustySplinters]

@@12voltvids Thanks, what about the safety lock switch? Everything seems to work like normal but no magnetron noise. What is the best way to diisspspate the voltage? Let it sit for a week unplugged? Just hate dishing out another $129-$150 for a new unit. Only lasted 6 years 9 months.

[@12voltvids]

The hv discharges within a few seconds. The capacitor has an internal bleeder resistor. Is it a conventional microwave with an big iron transformer or one of these inverter types. You can test for 120v ac on the primary side of a conventional microwave. The inverter units are much more complex to test. If it's shutting down after a few seconds and is an inverter type disconnect the magnetron leads. Note the orientation. Because if you get them reversed you can burn out the magnetron. On inverter type of you disconnect and it doesn't shut down after a few seconds then magnetron bad. If it still shuts down after a few seconds then the inverter is bad. If it fails to even attempt to start then it could be a bad switch.

[@DustySplinters]

@@12voltvids Lots of maybe's and could be's... might be better off giving it away to someone like yourself locallt ot me in PA who tinkers and might be an $8 switch. Mama want me not to open it up and just go buy a new one. I don't want to buy one at all. I am a senior and know how to use a gas stove top and oven. Plus I have a brand new toaster oven in a box I bought for a project 7-10 years ago and never opened it. Mama dudn't like that idea.

[@ashokshankaran2508]

what does a H98 fault on a microwave mean

[@allansierraolvera7984]

There’s no security measures when you open an Inverter microwave as the ones taken in a regular microwave regarding capacitors?

[@12voltvids]

Yes and then some. Inverters don't have the big cap, but when energized have even higher voltages. 4100 volts as opposed to about 2100 on conventional.

[@RichardDTube]

Nice video, all useful. That 15A that tripped, what voltage? 110/220? (I'm in UK, we only have 220 in houses.)

[@12voltvids]

That one running 120. We have both 120 and 240 here but small appliances like microwave run 120

[@drivewithvg9412]

Will the convection/ oven mode work if its its the problem with the fuse? Only my microwave mode is not working and the magnetron seems to be fine... My microwave came back to life and eventually died again. What could be the issue? Oven mode works even when microwave mode is not working.Thanks

[@12voltvids]

Fuse and thermal cut out will conlmetely shut down power.

[@drivewithvg9412]

​@@12voltvidsthanks for the quick reply. I will just try cleaning the internals and see then. Feels like some loose connection as it started working once and died again. Model is NN-C784MF

[@12voltvids]

@@drivewithvg9412 check relays on control board.

[@zutahirka]

Sir..what the output voltage from inverter pcb or normal pcb to magntron..or what is the input voltage of magntron...and prequency.

[@12voltvids]

About 4.2 kv DC to anode. Filament about 2 volts. Keep your fingers our. I was nailed once. Threw me across the shop. Very dangerous. It's a microwave transformer I used for the arcs on the opening. it will arc about 6"

[@diytrendytina]

I did the same thing with the flat-head screwdriver 😊great video! I guess I’m on the right path already! Thanks

[@IonaCarr]

My Panasonic (model NN-CT56JBBPQ, 3.5 years old) Inverter m/w combi has no display, no response of any kind with door closed BUT with mains power on, the turntable rotates with the door open. Clearly not main fuse not main door microswitch (checked). I have not checked monitor microswitch or timer microswitch (difficult for my arthritis affected fingers - so removal OK but challenge of refitting is off-putting unless there is a real prospect of it being relevant. I suspect a control panel fault giving rise to the strange malfunction. Can you help or comment please? [I have already bought a like-for-like replacement of the oven CT56JBBPQ) but I don't wish to simply throw away the faulty one - yet!]

[@mylittlewings7849]

How can fix H97 problem for Panasonic microwave oven NN-CD997S model? plz help me

[@elsiebeggs6854]

Wondering how to remove the pop out dial selector.

[@rcsontag]

I am amazed that you are ignoring the weak display. That display will continue to fade until it is unreadable. Why did you not troubleshoot it?

[@3sotErik]

You can pick up a whole set of security bits from Harbor Freight tool for just a couple bucks.

[@ggss1176]

Great video thanks. issue with my 2 year old inverter model is fuse found ok but no display. Only activity noted is If I open the door glass plate turns constantly and stops upon closing door. Everything else looks prestine inside the unit including circuit boards. Any advice appreciated cost me £250 when new!

[@dougle2011]

Hi, my Panasonic model no ct878sbpq, also had a faulty micro switch, blew a trip! Replaced that, but my turntable also rotates when door open. Did you find a fix for that please. leaving mine turned seams to stop,it for a while though. Thanks.

[@lookoutleo]

inverter versus normal transformer? whats the difference on power consumption? here in uk my old panasonic oven uses 220v 1300w ah you say 1450w at 120v interesting. wonder if would work on mains inverter off a battery?

[@12voltvids]

It depends on power output. Conventional topped out at around 800 watts and inverter models up to 1200 watts.

[@CotyRiddle]

Ive seen plenty of microwaves blow the fuse because a interlock fault.

[@12voltvids]

That's why the interlock is checked first. The plastic bracket sometimes wears out. See my video on the Kenmore microwave I did last year around this time. Bracket was worn, diagnosed it, and ordered the part, then did a second video for the part installation.

[@1959Berre]

I replaced a blown 10A fuse one month ago in a 240V microwave (yes, European). It worked fine for a month, then the fuse blew again. Can't find no obvious defect. Will check the interlock. Thanks for the tip.

[@ericsdash]

Thanks for posting this video. Great information! I have no power. Over time, it was cutting out intermittently and then we could get it back by hitting the front and then eventually it never came back. Sometimes, the display would be dim, but it would still work. There is definitely 120v coming in to the unit and the fuse is good. The black live wire is powered all the way to the plug on the board on the back of the display (the one with the blue wire that leads to the inverter) All 3 of my switches work fine as you demonstrated...but the monitor/short switch acts strange. When the switch is unplugged, it acts as it should...shorting with the button up and clearing when pressed down. The problem is when I have the wires connected, it remains shorted whether the button is up or down (the beeping continues either way) Any idea what is causing that?

[@sdang6422]

Hi mine has the same problem, did you get the response for the issues. Thanks for sharing

[@whitcwa]

@8:55 when you remove the second interlock switch you said "This just turns the timer on and off". That is wrong. It is a secondary interlock.

[@NicholasT-f9n]

Unfortunately Panasonic microwaves in the last several years have numerous quality assurance and poor reliability standards. GE is no longer making MW's, and Whirlpools are darn expensive. LG's have the keypad behind the door, and Danby's are inefficient. So what's the best 1.1 - 1.2 C.F. MW currently ?

[@Desuk1991]

How is your hand ?

[@12voltvids]

Fine, no burn.

[@jamesmoore4559]

Quite often the door switches will show continuity when testing but are actually bad. On load it will fail

[@murali5041]

I have Panasonic microwave oven ,when I’m micro power mode it’s operation for around 15 sec then it’s getting stop hearing what might be the reason

[@utopia2112]

One thing that is odd about the inverter microwaves is that they don't have that single large high-voltage capacitor you see in 99.9% of videos and articles about microwave repair. Instead they have two smaller ones on the board near where the power comes into the unit. You can see one of them @10:09 in the video. It is a black blocky thing labeled 2.2 microfarads and 275 volts. I was going nuts trying to find the HV capacitor every video and article told me I had to discharge. In the end I just tested continuity on the fuse and found that was the culprit. Thanks for having a video on one of the Inverter microwaves so I don't feel like such a weirdo!

[@12voltvids]

The inverter type do not have the large cap that conventional do. They use a flyback type transformer. Diodes and small hv caps. On these inverter type the frequency coming out of the transformer is very high and does not require a capacitor. The voltage is around 4200 volts dc. Unlike a conventional microwave which is either on or off, inverter types can dial down the voltage to reduce the power.

[@imranbabi7770]

My LG inverter microwave oven not hitting the food then what I m doing pls reply..

[@rlped]

I had a third situation. The bottom attachment for the spring had broken off. I was able to wrap a couple of strands of picture wire around one of the black flanges and all is now good.

[@SeanBZA]

Fuse fails yes, or the door is slammed, and the bouncing of the switch causes the shorting switch to operate and short the mains. Another thing that can blow the fuse is the lamp failing, as they typically draw a very high burst of current when the filament drops across the mains leadouts inside the glass when it dies. When buying fuses get the ones with ceramic bodies, they do not shatter like the glass ones. Very common for the fan to not run, as it is caked with dust and grease, and this eventually causes the oven to shut off after a few minutes of running as the magnetron is overheating. Clean, and put light oil on the bushes and it will work again. I have a KIC microwave made in 1984, and it still works well. Had to replace the light a few times, and eventually the magnetron got weak, so put a used one in from a later oven that rusted out. Lucky for me i live in a country with 230VAC mains, microwave fuses are 10A.

[@sylvestersenegal441]

Yeah magnatrons are easily replaceable ,and just troubleshoot the inverter board ...dam its just a smps power supply jacked up

[@12voltvids]

Generally when the door is slammed and the short switch contacts bounce the switch welds shorted. That is why the switches need to be checked each and every time a unit blows the fuse. On these units fuses fail after years of use just due to the springs getting weak and resistance building slightly causing heat. Seen it many times.

[@colbydewbre794]

Really easy to follow tutorial. Thanks for the knowledge 👍

[@rgruenhaus]

He mentioned not to put a cup of water without anything in it and that's exactly what he did!

[@landilefawane176]

Hi I've tested the door switches and they all seem to be functioning well but my panasonic inverter - the genius trips the power circuit breaker. Could the problem be with the inverter unit? How do I test it?

[@12voltvids]

If the switches are ok and it trips as soon as you attempt to start it could be the magnetron or the inverter. Try disconnecting the magnetron power wires and start it. If the breaker doesnt trip then you know the magnetron has a short and is drawing too much current. If it still trips then the inverter board is toast.

[@landilefawane176]

@@12voltvids thank you, I'll give that a try 👍

[@stevetapiwatwapmusic4032]

What If it's not heating?

[@peteb2]

Jeez e-louise.... never treat a scalding like that.... i.e. do nut'n. The instant something like that happens chuck an ice pack (even a bag of frozens) on the area and leave it there for as long as possible to suck the heat out of the area and to cool down the tissue below the surface of the skin that has zero tolerance to becoming over heated.... This way you cover off any chance of a blister forming etc. Us tech guys who rely on our incomes from our hands just can't afford to smash them around like that!

[@12voltvids]

Don't worry about me. I will survive. At least it wasn't boiling oil.

[@mrcorona77777]

Could you show us how to disconnect the beeping mechanism? Thank you Kind Sir

[@afdfzcdsg2267]

من فضلكم عندي ميكرويف باناسونيك بيفصل تسخين في اقل من دقيقه اسمع صوت السفاره ومبيكملش تسخين ايه حل المشكله

[@charliew3070]

Hi, Dave. Can you please make a video to show how to remove the control panel/keypad of a Panasonic inverter? The Panasonic microwave appear to be more complicated than most. Thank you!

[@ryanbedford9615]

What size fuse do those use?

[@12voltvids]

Usually a 15 or 18 amp ABC type. Will be stamped on the original and probably on the label on the inside of the cabinet

[@manjitchakkal8379]

Why fuse on my unit is soldered …..

[@armarra]

Good units from a user perspective. I have one here but its now right down on power. 6 mins to heat 1 cup of water from 17deg C to 65 deg C. I suspect either the capacitor or diode..moreso the diode as it is heating so the magnetron is fine. I am curious to see what a magnetron stirrer looks like. They distribute the microwaves more evenly so that no turntable is needed. I wonder if they can be retrofitted.. probably not but its a thought.

[@12voltvids]

It's the magnetron. They are a vacuum tube and they do get weak with age. If the diode fails you get no heat. If the capacitor failed they either go open again a no heat situation or they short and that results in a blown fuse.

[@troy3456789]

Sorry about your scald. I have a [broken] panasonic microwave I am going to crack open to see what is the problem now. Thank you very much. You burn wasn't for nothing. I love fixing things.

[@ryerci9618]

I have a panasonic inverter oven microwave and problem im facing is. I tried to reset it thru panadonic instructions. i plug it back in, it works but after some time, it shuts off and h98 appears. I opened the microwave and took out tbe magnetron, no magnets are cracked. Any suggestions?

[@12voltvids]

Does it shut down with both wires on magnetron disconnected ?

[@ryerci9618]

@@12voltvids No it doesn't shut down, it goes thru the cycle of the heating and sort of heats up the food but then when put up for another short run after a long 1, H98 appears and when I unplug replug, it works back again, and repeats itself. On some occasions the unplugging doesn't work and i have to wait a good 15 mins for it then run it. I checked the magnatron and it has all wires intact and no magnets are cracked as far as ive seen

[@12voltvids]

@@ryerci9618 How is the fan running. Almost sounds like it is overheating.

[@Niba1]

Cant take out the bad switch from same microwave. Its so tight and inside and very difficult to pull out. Im afraid i may destroy other parts in the cause of pulling it out. Taking to the technician is extremely costly cos i already know the plm. How can i take out the double swith, black & white ? 😭

[@Niba1]

The switches are super sealed. Cant come out. Even after pressing down on it.