Switch Mode Power Supply Repair, SMPS

How to repair a switching "switch mode" power supply. See what's involved. Also a brief explanation about the difference between Linear and switch mode power supplies.
fix a power supply switching power supply repair switch mode power supply fix
678 комментариев
Absolutely the finest teaching around. You have a gift, I wish my instructors would have had even 50 percent of your ability to transfer knowledge in such seamless way. Best on youtube for sure. Thank You!
Thilo Niewoehner
Scope rebuild?
Yes, please!
I'd love to see you (re-)building a scope, especially if it's a Tek.
Mike Hawkins
If I need to replace a through-hole IC, my preferred method is to cut the pins as close to the IC body as possible in order to leave as much of each individual pin in the board as I can, then I simply go round and remove the remains of each pin with tweezers and my iron. Then remove the solder with wick. Using this method lessens the chances of damaging the PCB significantly, it's also a lot easier and faster.
Mr Carelson...did you Test the IC's after Removal? Did you Test the Removed Capacitors? Would like to know what Component/s was causing the Unit not Operate.
Doug Gale
The theory part showing the switching vs linear supply was excellent! I get the feeling a 10x more difficult repair would still be nothing for you.
Sam J
This is the best tutorial about SMPS on utube..thumbs up indeed.
KayJay Parko
When removing a sus IC just cut it out from the top.
Less heat stress on the copper tracks.
super fuzz
Man, you are the Legend. I've learned a lot. Thanks
Rogerio Lazzari Jr
It would be an interesting challenge to reassemble the oscilloscope and could be a fun video!
Excellent video as always, great information and you make it easy to understand.
Dan Stark
Thanks for the tutorial vids. Your explanations are easy to understand.
Zoid-o Tron
Best electronics teaching channel I found hands down. I've been repairing electronic devices nearly 40 years full time and there is always something new to learn!! Thank you. 😉
Sharifski Action-Man
Thank you so much. Amazing! 👏🏿
John Hodgson
This is the best explanation I have seen of a SMPS.Thank you
Christian Ivarsson
"Bad things happen.. Really bad things" cracked me up lol. Nothing wrong with some magic smoke if done on purpose. ;)
Jeff Groves
I've watched you use the desoldering device in your videos and was interested whether you have a preferred type to use.

Thank you.
Excellent video as always. Thanks for your time making it, which I'm sure will be appreciated by lots of viewers.
William Kreth
good introduction to their operating fundamentals
Eduardo Avelar
Congratulations for your job.The quality of the sound and image are just amazing. Thanks to share with us.
Best explanation of a sm psu thanks
Dogui Tech
thank you very much for the explanation of how SMPS works i finally did get it
Rene Ofngol
Tnx sir, you shared a very helpful and informative knowledge especially to us who repairs smps powersupply. This very helpful to me sir as electronics technician. Tnx sir for sharing knowledge sir🙂
Bill Holmes
Always very interesting to watch and very informative. I've been in power electronics all my life but you always teach me something!
Anthony Ashpaugh
Paul another great video. I have really enjoyed your videos and have learned a lot from them. Keep them coming.

reace m
Thankyou. This information is like gold dust to Me
Steve Witte
Nice de-soldering tool
Dang, you're a teacher.
Great video can't wait to see the oscilloscope repair :-)
Af Tabak
Many thanks for your excellent tutorial. I was a TV technician 50 years ago, repairing tvs to component level. Then I moved up to Avionics tech job and later on to an aircraft engineer's job. I retired after 40 years without board level repairs. After retirement I find a pensioner's life extremely hard. I am refreshing my electronics knowledge to be able to repair TVs or Computers.Please keep up the good work. aftab ahmed. London
Very good explanation of the switch mode power supply, especially with your diagram you drew. If not already, you would make an excellent electronics professor. You have a very good teaching method.
wyclife omondi
Mr. Carlson your videos are great. Do you do medical equipments as well? I'm a medical engineering student and I love what you do.
Just keep coming back to your channel. Informative and I like the longer videos. I understand how much effort goes into your channel.
Thema inproblem
Thanks for another great video Paul! You're a spectacular teacher. Greetings from Arizona.
13:30 whats a hybrid?
Nice explanation of SMPS, thanks.
Watching these SMPS videos reminds me of my time working at a power supply manufacturers. Testing units from the production line to working with design engineers building their prototypes and developing them to production status. One challenging job I had was developing a 30kV pulse supply to be used on a magnetron. I wasn't privileged enough to know what the final product was (secret stuff). Another excellent video Mr C. and I've watched quite a few of them so far.
Cody Dowling
Another great one Mr. Carlson, thanks! By the way, did you see my question on your radio video the other day?
SWPS Power Supply is one level up from LCD Display
Hi, Thanks for a good video. Could you tell me what is the vacuum desoldering iron you use?
Fred Farnackle
Excellent video! Well explained, good audio, good vision. Thanks.
Stuff Builder
Great Video! You explained really well
Harpan Budi Santoso
Nice videos, new knowledge to me. As now I know there is some PS that needed to be loaded to work.

Thank you.
Thanks for taking the mystery out of the infamous switcher. What about the supplies that are in standby and you push a remote switch to turn them fully on? That is my issue at this time.
Tom Askey
Really enjoyed this video. I learned a lot about the difference between the types of power supplies, soldering and desoldering, testing the circuit, and general tips and techniques.
William Ogilvie
Great video, you know your stuff!
Robert Cleveland
Great video. I love the repair and troubleshooting videos. Thank you for all your great work.
Moses msuya
Thank for your videos it help me lots now I want you to do for amplifiers
Okra Solar
Another great video Mr. Carlson! We use DC SMPS's in our solar smart grid controllers but sometimes they bug out ... not sure if it's our control algos or circuit flaws haha. Let's just say there's a lot of solder / re-soldering to debug *sigh*

We need hardware engineers BTW, do you know anyone? Our job application page: http://bit.ly/2HXWvre
Christian Iversen
as always, really good and enjoyable videos! this is a great guide to SMP debugging. thanks for making these :) I'm wondering: wouldn't you realistically need to test it under full load before putting it back in, or should it be fairly safe to just use the equipment itself as a load test at this point?
Where could I find more information on how frequency affects transformer design?
In one of your videos I thought I heard you say something like "in the united states..". What is the accent you have when you "soulder"? Canadian? Fargo, NC? Sorry, lol. You are very easy to listen to.
James Hickey
Again, A+..................
Onno Jogot
very quality videos! thank u very much sir! keep teaching us!
Clifford Jones
One of the things when replacing the I.C.s on the vertical board, More for the readers of your tutorials (by the way are outstanding!) is to just clip the topside I.C.s pins with a flush cutter, makes removal of the leads so much easier, and helps to not damage the feedthrough holes too.
Also, Even though you mentioned to have the power supply turned off when you attach your alligator clips , I would suggest rather than the alligator clips is to either use mini grabber clips or use the same method you used to make up pin jacks covered with shrink tubing as your test leads. Your videos are always very instructional. Good job!
John Hill
As usual, I'm clueless, but his voice is so soothing.
Electronics - it calms even when watching someone else's fixing it. Thx Mr Carlson!
V Twin
Brilliant,Thank you.
Great tutorial! Can You share information which current limited power supply are You using for AC?
abdou sam
Good Job man, that was Great.
Truth Seeking
You have a really good understanding of troubleshooting very good job at passing the information to the viewer. Messy soldering. A+- lol
Many thanks great video as always enjoy hanging out with you HI HI  73  Leo k1zek
Ralph Kluge
another gr8 video. thanks. btw what temp do you run your soldering iron at?
Very good explanation! Thank you!
nice and awesome ! can we get a crt tv repair guide also, in such detailed manner ?
John Smith
Outstanding once again. You are absolutely the best tech and teacher I have ever encountered.
Qasim Seeha
Thanks for enlightening my knowledge :)
Steve T
Thanks, excellent instructions
Hi there ,
I don't know where to start , so I will start by say Thank You for the video . I never knew which is which and way are the difference between them !!! .
This is one aspect , the other is , and here I will Quote TOM "Very good explanation of the switch mode power supply, especially with your diagram you drew. If not already, you would make an excellent electronics professor. You have a very good teaching method.....
Mr Carlson's Lab I am no electronics expert by a long shot. I have learned so much from YouTube...... You sir are so very talented, and it is a pleasure to watch you work, even if it is above my head. Thanks for the videos."
Excellent video as always, great information and you make it easy to understand."

I can say no more than Thank You and keep up us on post .
P.S. I subscribed of course . LOL.
B. Alin
Thank you !!
Евгений Жердев
Great video!
Question 1: at the end of the video is a jumper on crocodiles? Question 2: Does the power supply itself turn on (without oscilloscope) when connected to the mains?
Panayiotis Samaras
What makes the -6.4V out unstable when there is no load?
Speaking of getting shocked, managed to touch 3 400v caps at the same time yesterday. Nice little pick me up after a long day :P wasn't my finest hour.
Douglas Tees
Nice informative video. Thanks for all the good technique. I only wish you had shown where to attach the mains supply. I'm always intimidated by switching supplies.
Greg Wolking
23:07 Soldering adjacent pins down one side of an IC one right after another with no "settling time" in between, on a double-sided PCB that requires more heat than a single-sided board would.

Do I *really* have to spell out what I'm perceiving as so *wrong* here? I was puzzled when I saw this, as you are normally so meticulous about such things. Am I missing something special about this particular application that lets you get away with that without wrecking the replacement IC?
Raj A
Great work, u make things a lot simpler. Just like u all there, keep up...
Gede Gede
Awesome video. I'd like to see whole series with more details. Good job.
Great work! Want to collab for PCB videos?
Man, I love this channel. Thanks for showing your technique for removing I.C.'s. They have proved to be a real pain for me in the past. Excellent stuff. Now, where is that old CB power supply I have that does not work?
Gregory West
Great video, as always, Looking forward to the "scope build" . Thanks, Greg
Great video, I have a question, I have an old dell laptop charger which I use for electrolysis but the problem is that it stops working sometimes so I guess there is a surge protector in there. Is there a way to remove this protection and will in doing so make it much more dangerous?
Great video and thanks for the easy to understand words. I always learn a great deal here. Thanx
338 Jigaman
what i need to do to make mi 12v switching power supply go from the max 14.8v to 15.5?
R Rajesh
Absolutely fascinating; the world of electronics and the way YOU present it to us. You are an inspiration at best. Thank you so much. I feel pepped up and positive. Good luck and much love. Cheers! 😊👍
Dewaine Gillie
great videos i am learning new things that i have seem to have forgetten. i have a gould advance oscilloscope it did come on but stop any good ideas.
John vL
I like you're Agilent U1253B Handheld Digital Multimeter. Cost a lot around $600,-- !
Ray M
great video as always, what model is your desoldering gun?
Axel Haar
So many good hands-on Tips. Awesome.
Ty Huffman
Thanks for leaving the flux @18:00 minute mark, that helps with making sure what I'm doing is what you are doing.
Great job dude. You have more patience than I do. LOL
ACDCplus Inc.
Great video on repairing switching mode power supply
mohamed elbrami
Thanks for the video PLEASE i need your Help ....Im looking for a universall Mosfeat Driver Circuit shematic ....for power supply that provide 5V 30A
Bobby Tectalabyss
Bravo Paul. Thank you very much for sharing these awesome videos with us. I do appreciate the time and effort you put in to each and everyone.
All my best.
es nam
Interesting video with a clear circuit explanation. Thank you very much. How much time is typically required for such a repair?
Spark Gap
wow that oled multimeter display is really something, I had to watch in low res can anyone tell me the make and model?
Larry Doolittle
Nice job again. I was wondering why you don't use a shop air desoldering tool in place of the self-contained Hakko? You have that lovely compressor and they are so much quieter.
Endre Storøy
all away from norway i Learning abote elecrtoniks, so thanks for that
Allan van der Westhuizen
Thank you for the teaching.
Charles Smyth
The croc-clips on the -6.4V looked dangerous :-)
Stu B
That was a very good video, well done.
Pablo Padilla
Oscilloscopes, power supplies, multi-meters, yes please! Thanks for another great video!