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- เผยแพร่เมื่อ 26 ก.ค. 2024
- Part 2: Panasonic Inverter microwave fuse replacement. Fuse location, fuse type, how to check it, and testing microwave after fuse replacement.
The saga of the Panny microwave spoiling my Saturday continues; finding the problem and deciding to fix it or toss it. I hate throwing good things into the landfill and I enjoy a challenge; so fixing is naturally the only option. Let's get to it!
In this video we'll see the what, where, and why of a Panasonic microwave fuse. This microwave like most uses a standard 20A, 250V rated microwave ceramic fuse (see link below).
Replacing a blown microwave fuse is the first step in the diagnostic process since it's one of the easiest items to check and fix. Don't just jumper the fuse however to test your microwave. There may be bigger problems as was the case here. If I would have just jumped the fuse, I would have blown the input power board traces or components causing even more damage.
After ruling out the fuse, we have to start digging deeper - hopefully your microwave will be an easy fuse replacement fix; but if not, the second half of the video starts down the rabbit hole. How deep does it go???
Microwave 20A 250V universal ceramic fuses:
amzn.to/33tNvUr
Part 1. Removing Over The Range Microwave Oven:
• Over the Counter Micro...
Part 3. Replacing Inverter Board & Testing:
• DIY Panasonic Microwav...
Video Chapter Time Index:
0:00 Intro
0:30 Opening the microwave
3:26 Finding the fuse
5:02 Testing the fuse
5:55 Checking operation with new fuse
7:12 Testing the magnetron
9:39 Inverter board diagnosing
15:30 Final thoughts
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Nice instructive video. I am much less of an expert and even less with a meter in my hands. Looks like you narrowed the problem down to something on the board at which point I would have spent the $50 for a new board rather than $20 plus extra time and effort to see if I could fix the old one. Of course, if it is important for you to know exactly what component went bad then fine. If you're wrong, then you are out on the original $20 experiment + $50 new board + extra time and effort. But hey, the price of education and\or satisfaction of knowing is sometimes worth it.
Agreed. I just ended up ordering & putting a new inverter board in - here's the repair: th-cam.com/video/FL7KgVC6pmk/w-d-xo.html
Like you, and after contemplating the options, I simply couldn't be bothered with tossing components at it for the small "potential" savings and extra time involved.
Thanks for the detailed post John. Tried to find your vendor TV-ECO-PARTS since I am in Canada as well, but couldn't find him. Had to use someone else. Fingers crossed the repair works. Like you I am loathe to buy a new microwave and begin a new install. (Also keep the old microwave out of a landfill.)
Hope it works out for you too. I just googled "TV Eco Parts" an their ebay store came up as the first search result. Here's the link to their ebay store if you ever need it for future repair parts: www.ebay.ca/str/tvecoparts
Great video and an Interesting insight to the inverter board. Thank you for sharing your experiences.
Glad it helped.
thank you hope you get it sorted
LOL that opening line.... I feel ya!
Yes, part of the fun of fixing stuff yourself isn't it 🙂👍
Thanks for the video John. I was using the microwave and there was a burning/smokey smell. I shut it off and tested again fuse blew. Any suggestions? Will check megnetron but the smell seems to be coming from some copper coils connected to power code. Any advice?
very informative video. So did a new inverter board fix it? I have the same issue. --> blowing the house breaker when I turn on the magnetron when RL1 activates. Monitor door switch seems okay. Everything else works. I suspect a shorted IGBT.
Yes it did - th-cam.com/video/FL7KgVC6pmk/w-d-xo.html
Thanks John for the video. I have disassembled my microwave and the inside looks just like this but I can't locate the fuse. Could some fuses look anything other than what you have showed in the video?
Not that I know of. Every microwave I've seen or taken apart over the years all use that same kind of ceramic safety fuse.
@@Rchelicopterfun I've completely torn it apart and still found no fuse. It's strange how it was working before
@@parvinmohammadi4499 Mine wasn't on the noise filter board. It was in a separate holder right from where the line comes in.
Haha that first sentence 😆
Hi there,
I really need some help please So my Panasonic inverter microwave oven blows the line fuse as soon as i press the start button regardless on what setting I run the microwave ( ie oven,grill,microwave) I have checked the door interlocks, fan ,magnetron and all seem OK any ideas on what I should be looking at. Any guidance would be appreciated
Same issue with me
Did you diagnose the problem? If yes please share with me also
@@syedshariquehussain9669 it was the High Voltage unit replaced and works fine now
Dear, is it possible to convert the microwave to work on the normal converter instead of the inverter? I mean, is it possible to dispense with this inverter card and return to the old or usual system? Thank you
Not possible. Don't modify a microwave - keep it stock or get a new one.
My sony mhc system having T10 A fuse and its blown so i used normal glass 10 A fuse but its immediately blown, so is it my circuit already damaged? Because my fuse immesiately blown?
Something is shorted, you'll have to fault trace to find the faulty component/s.
5:45 It's a bit odd that they used a 20A fuse when these ovens normally can run off a 15A outlet. Do the built-in ones consume more than 15A?
20A sand filled, fast blow fuses are the conventional norm for most built in microwaves. Built ins generally do use more power over a counter top as they have an exhaust fan and lighting on top of the 1100W microwave power consumption. A 15A fuse would likely be enough in a bind (1100W / 120V = 9.2A) + at least another one or two amps bringing the total close to the sustained 80% (12A) rating a 15A residential line it rated at. 20A is the standard in these over the counter units, likely to cover the momentary current surge that occurs if the microwave was running at 100%, lights at 100% and then fans are turned on at 100% which would most likely peak over 12A and maybe even reach over 15A for a fraction of second. A 15A fast blow fuse would blow before a 15A breaker would trip and it's much easier to reset the breaker than replace the internal fuse.
My Panasonic otr uses a 20A slow blow fuse, not fast.
Microwave wall gets hot not food?
It just might be the Hi voltage capacitor shorted??
The caps on the inverter board checked out fine - none were shorted... 🤔
The Inverter had that shorted rectifier as shown. Replaced the inverter and it has been working great since: th-cam.com/video/FL7KgVC6pmk/w-d-xo.html
If the magnetron itself is malfunctioning, the microwave won't heat
Really, I thought they just put it in for ballast 😄