Failed 24V 10A power supply repair 

I love how you solder SMD with a hot shovel.

"the transistors in, i don't care how it looooooks" - ROFL man, you crack me up every time.

I really appreciate that someone who knows spends the time to spread the knowledge, there is so much crap content on this platform regarding power electronics.

The plastic bag as a transparency sheet kills me. I honestly admire your reuse of everything. I find myself making lots of my projects out of harvested components, and I refuse to let tech end up in the dumpster. I must try and fix it first regardless of its value lol

That extension cord with the skidmark on the sockets is so iconic to this channel 😂

JBC really needs to sponsor this guy with a good soldering station.

Good repair! If it wasn't for the gate drive transformer, the mosfet gate would've been pulled high, turning it on and shorting out the supply. It would've been very messy! I like GDTs for that reason, they help prevent 'chain reaction' failures.

Always love seeing a diode go wild!

Looking at the temperatures it looks like the specs are somewhat dodgy . 200W is only about 81% full load and this thing is already cooking. Its one thing for the Power semiconductors to get hot , but the magnetics , smd etc will end up drying out the filter capacitors and make it fail again. Great detective work on identifying the bad transistor !!

The best preparation, the best explanation, the best steps, and the best drawing of diagrams and values. Content creators are tired of following you. Thank you

Thanks. A great repair. I really liked the look of that Tesla 24v light bulb.

I dont know why, but for each video you release i learn something new ❤️. Must be the way you explain, slow and easy without going down the iceberg on each and every single part!

It's been sooo long since I haven't watched a good old DiodeGoneWild video. I have been busy asf and haven't really been doing electronics but time to get back to it! You're still just as amazing as you were back when I used to watch you a ton!

I also had transistors with Collector-Emitter short but other junctions were fine. There's just how it is. Always check all the junctions because you can waste a lot of time searching for other faults which are not there.

this channel is probably the most funny yet on topic that I have watched in 2023 - thank you brother for you amazing job, time, passion and patience - mej se hesky broucku!

I like your presentation style. You do an excellent job of explaining the circuit logic and don't assume the listener can interpret function at first glance. Thanks!

Figuring out that SMD was a double diode was very impressive.. 👍🇮🇪🙏

Absolutely love these fault finding methodology walk thru vids. Cat needs to tone it down about them being too long tho

Great video as always! The power supplies most commonly sold in Australia are 'Mean Well' brand. Unintentionally hilarious name which always makes me smile!

Love your 60Watt capacitor discharge lamp. Very interesting inductor with that flat ribbon conductor on it. Clever with the transparant plastic bag on the drawing. Your cats eyes are awesome. Great repair. Poorly designed board with underrated SMD components.

Great video. I especially liked how you worked out it was a double diode. Thanks, have a Merry Christmas and Happy New year ☺

When I measuring transistors, I always perform C-E test too, because one time, I run in the exactly same issue and then spend a lot of time for diagnosis.. 😂 Great repair and excellent video as always! 👍

Great diagnosis! That's my favorite content on your channel 👍

Whenever Dany uploads my day gets slightly less dodgy.

Boss move with the soldering, well done!

I have seen plenty of flyback PSUs with output inductors in a pi-filter arrangement. 24V 200W lamp? Never imagined something like that existed.

I like your videos, you so obviously know exactly how the circuits work, even drawing your own circuit diagrams as you progress through the job in hand. Great stuff! Thank you!

One fantastic repair video, learned a lot! Take care and I wish you the very best with many educational videos in the future.

Thanks for taking the time to make this video man, it is really informative. I appreciate it a lot.

i love your heavy duty soldering technique, it's great.

20:37 😃Thanks DGW for another great video!! May many continue to support this great channel because videos like this are so valuable. God bless you!😌🙏

Your videos are very educational. I leart from them a lot!

Great one again. Why thermal cameras are so expensive :( ?

The failure mode appears safer than when it is functional.

The ways of cost cutting in cheap electronics often become hilarious ;) I even doubt that somebody in manufacturing of these PSUs actually cared about how high plastic will go under power transistors. It is possible that inital design assumed plastic insulation bent in a way that it ends where transistor begins.

Very good thx... i have opened and fixed so much in 35 years but i have never seen that copper spool before

How do you know all this stuff? Incredible. I watch and listen, and it’s like it’s in a different language. Love your videos, thank you

yaay!! I love you're videos about power supplyes, thank you!

Thank you for this video! I occasionally repair switchers in a production environment. I have the luxury of a complete stockroom. When they do go bad it is usually a great show. I start by removing the power devices. Then I can start with the PWM. Once the drive side is good, I can install new devices. With the devices and the drive transformers removed, I can hipot the transformers.

Great walk through of repair procedure.

Thank you so much for doing these videos! Learned something new today.

One fantastic repair video, learned a lot! Take care and I wish you the very best with many educational videos in the future. ☺

That thing looks way too much nicer then it is. Excellent video!! I'd like to think I have some patience with fixing and learning, but if that psu ever damaged anything nice or failed at a bad time I would torture it.

Brilliant! Thank you for another great, educational, and entertaining video. 😉👍

Excellent repair. Very methodical. I also use plastic bag for overlay sometimes as well, lol..

Always love me some "quite cooking" resistors lmao 😄

I was suspecting the chip all the time. Nice!!

Great fix, loving that transformer ring tester too. Guessing it's for finding out the coil windings.

Great as always. Greetings from SA.

This guy is really talented!❤

Another amazing fix.

Nice bare bone PSU, very good for learning. Proto board on the secondary side was hilarious. Kids in China assembled this during Technology class in Elementary School LOL :D

More repairs!.. Love it.

Nice diagnosis and repair.

Since PSU was donated from Slovakia and DGW is Czech you could say it's Czechoslovakian project !

W0w, I learned alot and still didn't grasp half of it! :D

Great work!

My respect... You are the man!

Love the bit where you say it might be a good idea to use a lamp in series, then plug it into the socket that is close to the one that looks like it was wasn’t used in series with a lamp 😂

Really informative vid learn a lot in this one. Hope u have a nice Christmas

Nice video again! I expected much better quality from that power supply too.

Gratulujem k úspešnej oprave zdroja. Tá odrušovacia tlmivka má podľa mňa pre to také placaté vinutie, aby bol dosiahnutý dostatočný prierez vinutia (a tým pádom aj prúdová zaťažiteľnosť) pri malej šírke vinutia, aby sa mohol dosiahnuť dostatočný počet závitov.

Danke! Thanks! Interesting failure.. Thanks to the donor boards smd transistor xd Redirect/relocate the secondary heating resistors to preheat your tapwater to savfe energy XD

nice repair, I would never have found that

Yeees! A power supply! Amaziiiiiiing!

I knew a genius like you could easily repair this SMPS 🙂 Great job, but not easy to find. You really need to understand how it works in any part! From top view this PSU looks like the typical cheap chinese ones, but the underside looks different with the SMS-components. But could still be chinese quality work ;-)

Great diagnosis and fix. Loved the cat's comment about the thermal image. Seasons Greetings to you, the cat and the dog.

Great content! Subscribed! I absolutely love your accent. It's like listening to music!

you should make yourself an isolation transformer for testing. If you were using 120vac there you could use a transformer with dual primaries for 120/240v. but in your case you can't do that so just find a pair of identical transformers and wire them back to back.

Realy like your vids , its back to basics but u have the ,nack, of fault finding well done

Hi, I'm always eager to watch your unique and informative videos. Since my language skills are limited, I would appreciate it if you could turn on subtitles.

I feel like Id have to read 1000 books to talk like this guy

Awesome repair. I've got a meanwell 24V supply in my bucket of junk that doesn't work, might be time to look into that one. Love these repairs!

Great video! I live near Plovdiv - where V-tac is based. They just rebrand cheap chinese power supplies and sell them as their own. I never liked how bad the circuitry in these is and it's just ridiculous that this power supply is made without a fan. Especially considering that it will probably be stuffed in to a hot unventilated ceiling space. It's a fire hazard!

I have never seen a 24V lamp with E27 socket before 😮

Danyk, Your videos needs to be more frequent !

I've seen these on Aliexpress, and you just showed me why I'd not buy it :D.

Good Czech Repair 👍

V-TAC is a dealer of light devices,this supply is for led ribbons or led bulbs on low voltage

"Over 20 minutes and still no thermal image" I burst out laughing. The serious look on your cats face!

You can only repair such a power pack if you can get proper replacement parts which isn't always possible. And in my experience of electronic repairs power packs like this one and especially those used in PC's often use really obscure parts which can be well nigh impossible to even find information on them, never mind replacements, and such components often give really obscure readings on a meter too instead of straightforward faulty or ok. And of course sometimes the switch mode transformer fails with shorted turns and rewinding it is definitely not for the faint-hearted, it takes tons of confidence, patience, and of course the right skills and equipment.

I like repair videos. Thank you

I used to sell and fix v-tac power supplies. Prices are low and quality is also low. Plastic film you found under transistors and diodes are a constant thing in every one of them. Main issues consist of fuse-thermistor-bridge rectifier - transistor in primary going short because of main chip capacitor going short circuit because of overheating that is if there was no factory defects. Also bad soldering of everything mainly primary capacitors usually suffer and burn the board and traces. Sometimes you can see the problem in 2 seconds and fix it with a blob of solder and sometimes you can spend 2 hours like You did. Capacitors v-tac uses are pure shit and thermal design is shit so we made a rule that if you want to buy v tac power supply we would not sell you one if you plan to use it to it's maximum rated current. If you leave some space aprox 30% less than max output current they would last you 10 times longer than on max current. If you insisted on buying v tac (because of price) we would give you the next one up in current rating and lower the price. Meanwell power supplies are much better or SE lighting or Lifud or EagleRise but much more expensive ofc.

Great video, thanks.

very helpful, thanks

I love your video Sir.

The blown socket tells all the story.lol

Whenever I have one of these kinds of cheap power supplies that's died, I usually open it up thinking I can repair it, then decide it's not worth it after seeing the quality of the design and components. Even if I were to repair it, there's no way of knowing if some other cheap component is going to die after another few months, and I'll just have to spend more time and effort fixing it. A good brand replacement might cost more and take longer to arrive, but you'll save a lot more time and hassle in the future if you can afford it.

A big heavy soldering gun and a botched joint with a lot of rosin is the channel's classic, please don't replace it

Hey, this is a nice video. Keep going. I saw that the power supply was manufactured in Bulgaria, the country that I live in. Greetings from Bulgaria!

What mods would you suggest to improve this power supply's design and to reduce those temperatures? Also, i just want to say that as always, your explanations are priceless when it comes to diagnosis.

Make more of this kind of videos

Dang...i think I'll dream tonight the emiter and collector 😅

The power supply lags a PFC, which is required at this power level.

A most excellent repair. 🥳 That power supply was lucky to work at all with the poor soldering job. Thank you for the great troubleshooting. I wish there was a repair video on the 'Tenma 72-6628' or 'Extech 382213' 5v, 12v, 0-30vdc 0-3amps Triple output DC power Supply. The 0-30vdc stopped working?

Genius, as usual ..

Merci for this video.

That accent is wild. Great video.

I keep an old analogue meter on the bench JUST for testing transistors in this way... in-circuit shorts are much more evident when you are testing with an appreciable current through the device.

Everytime best experience man 😅