For 2-3 pin SMD components like SOT-323 packages in not very tight spot it is usually enough. Flux amount and quality matter much more here. Also good tweezers and steady hands.
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.
@@1pcfred I did the same. I soldered a super tiny 0,25 x 0,5 mm SMD resistor on the mainboard of my computer. That was 8 years ago and it still runs. It was part of the SATA circuit and was a manufacturing defect (it was soldered improperly and when checking it it fell off the board entierly). I also used a soldering gun, in fact almost the same as he uses (a newer model with LED light instead of a bulb).
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
When you have the desire but not the money, you will find a way. They say "Neccessity is the mother of invention." The best engineers I've worked with were the most resourceful and did more with less. There's book smart people and then there's real engineers.
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
What's wrong with using old tech? I still use that soldering gun. It has never failed on me. On the other hand, I went through four soldering irons/stations. Czechoslovak quality forever!
For £20ish you can buy T12 soldaring station. Tools nowadays are cheap ;). Even my microscope with HDMI was less then £100 ;). And Hantek, a good 2 channel oscilloscope with decoders like UART, 150MHz and 2Gs is only around £150.
@@screen-protector It depends on your country, were I live we suffered with Protectionism for 40 years and tech is x2 or x3 the price. (we are not allowed to import) But at least, food is cheaper than other countries.
I have watched almost all of your videos and I have to say, that this is one of my favourites in terms of fault finding videos. Brilliant the way you were thinking.
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
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.
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!
"Great, I found a video that explains in detail the function of each component within the power supply and the different configurations of these components." keep it going sir
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!
I've long said that Dany is a natural born teacher. Not the type that regurgitates rote information over and over, but rather a natural, hands on, explanatory style, which can only be accomplished by a teacher that retains a 100% full grasp of all of the factors at play in all circumstances. In my humble opinion, Dany is a natural in electronics and in teaching. No book can teach you the way he does. Fred
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 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!
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! 👍
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.
Great video as always! The power supplies most commonly sold in Australia are 'Mean Well' brand. Unintentionally hilarious name which always makes me smile!
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!
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.
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.
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.
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.
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.
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
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 ;-)
The overheating snubber resistors and the bad solder joints make it a chinese quality. The solder doesn't properly stick to the mains terminal block pins.
@@DiodeGoneWild Yes. These solder problems have become much worse since leaded solder was banned from commercial products.I really dislike unleaded solder.
@@ProdigalPorcupine Lead free solder sometimes uses indium and antimony which is not only less reliable, but their souble compounds are still poisonous silimar to lead compounds. I heard that lead free solder is not allowed in medical equipment because it is too unreliable.
@@ProdigalPorcupine Yea, the first thing I do when I get a cheap Chinese thing like this is disassemble it and inspect/redo all of the solder joints that have large/heavy components (inductors, capacitors, transformers, heatsinks, terminals, connectors, etc) attached.
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.
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.
@@jamesl9686 I would add some 3mm (or thicker depending on space) thermal pads on the bottom side of the board that touch the board and the bottom metal case so the heat is pulled away to the metal case. I do that kind of simple mod with everything that gets hot. Especially TV video board that usually get so hot you can't touch it. They are designed to fail after a few years and usually the heat is the cause of it. Manufacturers know that and design so it doesn't last too long so they can sell you a new one heh!
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.
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!
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 😂
Once i had a similar case in a power supply with no component failed as transistors,capacitors,optocoupler,resistors and no fuse blown nor pcb track failed.With having no other things to do i decide to solder all the smd parts including the 8 pin smd smps controller and the power supply then worked as before.But i am still no sure if the problem was pure dry joins on some smd part or a malfunction on the smps controller that worked again after the applying of the soldering heat and in the near future will have the same problem again.
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.
Thanks :) It actually says MADE IN CHINA. I guess the Bulgarian company just ordered these from some chinese maker. I also wonder if a 240W power supply shouldn't already have a PFC.
@@DiodeGoneWild As far as I know, a PFC is should be included in the more expensive power supplies. I am not sure if this cheap-ish 240W power supply has PFC. It would be better if it had such correction.
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 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.
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.
Let me just say that i used a 20w 12v one to power 3 5mm leds in series with a resistor for a plexiglass project that was on aprox 10h a day and it died after 1 year. @@balas3037
I love how you solder SMD with a hot shovel.
Lololol too funny 😂
Sometimes, all you need is a good hot shovel
he not have an iron or something?
@@cdoublejj he doesn't need to iron his clothes
For 2-3 pin SMD components like SOT-323 packages in not very tight spot it is usually enough. Flux amount and quality matter much more here. Also good tweezers and steady hands.
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 transistors in, i don't care how it looooooks" - ROFL man, you crack me up every time.
SMD soldering with a soldering gun is legendary.
@@1pcfred yeah, with that blunderbuss he is using it most certainly is legendary.
@@1pcfred I did the same. I soldered a super tiny 0,25 x 0,5 mm SMD resistor on the mainboard of my computer. That was 8 years ago and it still runs. It was part of the SATA circuit and was a manufacturing defect (it was soldered improperly and when checking it it fell off the board entierly). I also used a soldering gun, in fact almost the same as he uses (a newer model with LED light instead of a bulb).
Gotta love the accent.
This channel wouldn't be so funny if not his accent ☺
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
In some cases, fixing something that has a value of 30€ costs you 200€, but if you find crazy people like me to finance it, then why not?
The plastic bag is the best optimisation results
same 😁
When you have the desire but not the money, you will find a way. They say "Neccessity is the mother of invention." The best engineers I've worked with were the most resourceful and did more with less. There's book smart people and then there's real engineers.
Thanks. A great repair. I really liked the look of that Tesla 24v light bulb.
That extension cord with the skidmark on the sockets is so iconic to this channel 😂
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
JBC really needs to sponsor this guy with a good soldering station.
What's wrong with using old tech? I still use that soldering gun. It has never failed on me. On the other hand, I went through four soldering irons/stations. Czechoslovak quality forever!
For £20ish you can buy T12 soldaring station. Tools nowadays are cheap ;). Even my microscope with HDMI was less then £100 ;). And Hantek, a good 2 channel oscilloscope with decoders like UART, 150MHz and 2Gs is only around £150.
@@screen-protector It depends on your country, were I live we suffered with Protectionism for 40 years and tech is x2 or x3 the price. (we are not allowed to import) But at least, food is cheaper than other countries.
I have watched almost all of your videos and I have to say, that this is one of my favourites in terms of fault finding videos. Brilliant the way you were thinking.
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
Always love seeing a diode go wild!
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.
One fantastic repair video, learned a lot! Take care and I wish you the very best with many educational videos in the future. ☺
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!
"Great, I found a video that explains in detail the function of each component within the power supply and the different configurations of these components."
keep it going sir
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!
I've long said that Dany is a natural born teacher. Not the type that regurgitates rote information over and over, but rather a natural, hands on, explanatory style, which can only be accomplished by a teacher that retains a 100% full grasp of all of the factors at play in all circumstances. In my humble opinion, Dany is a natural in electronics and in teaching. No book can teach you the way he does. Fred
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 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!
one of the best repair and tear down channel ever been seen...keep up the good jobs
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! 👍
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.
Great video. I especially liked how you worked out it was a double diode. Thanks, have a Merry Christmas and Happy New year ☺
Thanks, to you too!
One fantastic repair video, learned a lot! Take care and I wish you the very best with many educational videos in the future.
Figuring out that SMD was a double diode was very impressive.. 👍🇮🇪🙏
Thanks!
Great video as always! The power supplies most commonly sold in Australia are 'Mean Well' brand. Unintentionally hilarious name which always makes me smile!
Great diagnosis! That's my favorite content on your channel 👍
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!
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 one again. Why thermal cameras are so expensive :( ?
Probably the economy of scale. It's not something everybody needs. But they will get cheaper over time.
Absolutely love these fault finding methodology walk thru vids.
Cat needs to tone it down about them being too long tho
Love your work brother. Saludos from Mexico 🇲🇽
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.
Whenever Dany uploads my day gets slightly less dodgy.
Focus more on repairs, taking action and your days will start to be even brighter :D.
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
Since PSU was donated from Slovakia and DGW is Czech you could say it's Czechoslovakian project !
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!😌🙏
Very good thx... i have opened and fixed so much in 35 years but i have never seen that copper spool before
I have seen plenty of flyback PSUs with output inductors in a pi-filter arrangement.
24V 200W lamp? Never imagined something like that existed.
Thanks for taking the time to make this video man, it is really informative. I appreciate it a lot.
Boss move with the soldering, well done!
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.
i love your heavy duty soldering technique, it's great.
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.
Great fix, loving that transformer ring tester too. Guessing it's for finding out the coil windings.
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.
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
I've seen these on Aliexpress, and you just showed me why I'd not buy it :D.
I'd still be trying to work it out, thanks for the breakdown and explanation.
Great content! Subscribed! I absolutely love your accent. It's like listening to music!
Your videos are very educational. I leart from them a lot!
The failure mode appears safer than when it is functional.
I was suspecting the chip all the time. Nice!!
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 ;-)
The overheating snubber resistors and the bad solder joints make it a chinese quality. The solder doesn't properly stick to the mains terminal block pins.
@@DiodeGoneWild Yes. These solder problems have become much worse since leaded solder was banned from commercial products.I really dislike unleaded solder.
@@ProdigalPorcupine Lead free solder sometimes uses indium and antimony which is not only less reliable, but their souble compounds are still poisonous silimar to lead compounds. I heard that lead free solder is not allowed in medical equipment because it is too unreliable.
@@ProdigalPorcupine Yea, the first thing I do when I get a cheap Chinese thing like this is disassemble it and inspect/redo all of the solder joints that have large/heavy components (inductors, capacitors, transformers, heatsinks, terminals, connectors, etc) attached.
@@mernokimuvek It's honestly surprising that they even try to use lead-free solder and don't just lie about it.
Nice video again! I expected much better quality from that power supply too.
Hi,what is the tool you use at about 09:40 , the red box ? Is it home made ? Please could you share information ? Thx
danyk.cz/avr_ring2_en.html It's a ring tester
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.
Excellent repair. Very methodical. I also use plastic bag for overlay sometimes as well, lol..
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.
@@jamesl9686 I would add some 3mm (or thicker depending on space) thermal pads on the bottom side of the board that touch the board and the bottom metal case so the heat is pulled away to the metal case. I do that kind of simple mod with everything that gets hot. Especially TV video board that usually get so hot you can't touch it. They are designed to fail after a few years and usually the heat is the cause of it. Manufacturers know that and design so it doesn't last too long so they can sell you a new one heh!
yaay!! I love you're videos about power supplyes, thank you!
Thank you so much for doing these videos! Learned something new today.
This guy is really talented!❤
nice repair, I would never have found that
Me either. I was convinced it was that skid mark on the board.
Great as always. Greetings from SA.
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.
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!
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 😂
W0w, I learned alot and still didn't grasp half of it! :D
Once i had a similar case in a power supply with no component failed as transistors,capacitors,optocoupler,resistors and no fuse blown nor pcb track failed.With having no other things to do i decide to solder all the smd parts including the 8 pin smd smps controller and the power supply then worked as before.But i am still no sure if the problem was pure dry joins on some smd part or a malfunction on the smps controller that worked again after the applying of the soldering heat and in the near future will have the same problem again.
It might have been a bad solder joint or a tin whisker.
Great diagnosis and fix. Loved the cat's comment about the thermal image. Seasons Greetings to you, the cat and the dog.
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.
you learn something new each time you repair it
And the poor efficiency of that and it'll have a bad power factor rating.
I have never seen a 24V lamp with E27 socket before 😮
That is the beauty of Eastern Europe where a lot of this non common stuff is around.
Great walk through of repair procedure.
Always love me some "quite cooking" resistors lmao 😄
V-TAC is a dealer of light devices,this supply is for led ribbons or led bulbs on low voltage
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!
Thanks :) It actually says MADE IN CHINA. I guess the Bulgarian company just ordered these from some chinese maker. I also wonder if a 240W power supply shouldn't already have a PFC.
@@DiodeGoneWild As far as I know, a PFC is should be included in the more expensive power supplies. I am not sure if this cheap-ish 240W power supply has PFC. It would be better if it had such correction.
Great step by step diagnosis; you nailed it nicely and I learned that an ESR meter can be used in different ways.😊
@@borismetodiev3218 not even my 12V 50A (600W) chinese PSU have PFC. It's a luxury feature among those cheap PSU's.
не съм сигурен че правено в България :D Осрам правеха преди 2-3 години захранвания в Пловдив, но Vtac мисля че са си чисто китайски
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.
Danyk, Your videos needs to be more frequent !
My respect... You are the man!
Yeees! A power supply! Amaziiiiiiing!
Realy like your vids , its back to basics but u have the ,nack, of fault finding well done
2:31 you can see the 2 diodes next to the 2 Transistors which can mean its a 2-switch forward or some other type of forward
Good Czech Repair 👍
"Golden hands of Czech craftsmen"
What determines if the line endings are excited or depressed?
Why is it necessary a wide board space between primary and secondary? Is it displacement current?
I feel like Id have to read 1000 books to talk like this guy
More repairs!.. Love it.
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!
Brilliant! Thank you for another great, educational, and entertaining video. 😉👍
How can you not subscribe to a channel that solders SMD components with a solder gun?
Really informative vid learn a lot in this one. Hope u have a nice Christmas
Dang...i think I'll dream tonight the emiter and collector 😅
"Over 20 minutes and still no thermal image" I burst out laughing. The serious look on your cats face!
Nice diagnosis and repair.
Hey there, how do I donate chargers? I have two dodgy looking chargers I'd like to see torn apart.
makes me wonder why they have that yellow clear cover on the terminals when the entire top is vented like that.
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.
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.
This test was only ~80%(200w) and it still cooks!! .Maybe derate to 50% lol!!
Let me just say that i used a 20w 12v one to power 3 5mm leds in series with a resistor for a plexiglass project that was on aprox 10h a day and it died after 1 year.
@@balas3037
why where'nt the two burnt out resistors checked first?