850W computer power supply - how does it work (with schematics)
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- เผยแพร่เมื่อ 21 มิ.ย. 2019
- Today I tried to repair a big 850W ATX computer power supply. It had quite a lot of faulty components, so instead of fixing it, I decided to reverse engineer some schematics, explain how does it work and do some experiments on it. It didn't go horribly wrong, just horribly long :).
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Watched and studied it all. Repairing a new never used new Apevia Signature ATX-SN1050W 1050W 80 PLUS Bronze Power Supply I bought for $10 on Ebay ...not working. I traced from 110VAC input to the outputs. Single cap for the +180vdc after the input bridge, unlike most with dual caps but that was the only power reading I was getting. Nothing was turning on. All the semicons tested good. So figured I need to find where the +5 vdc was being supplied from first ...the small transformer and associated ic next to 2 opto couplers. All looked and tested good and found the +5 vdc from that circuit. So i traced the +5 vdc from there and found a mini crack in the +5 vdc very thin 1mm trace on the edge of the circuit board at one of the 4 mounting corner posts. Apparently the box had been dropped with enough force to move the pcb enough to crack the trace. Solder bridged it ...success. Your info helped me track it down. Thanks
Weird it didn't break the board. . .
Bloody hell is all i can say about this one. Studiying EE for 4 years now, took a break to watch a new video from my favorite YT channel. This is some next level engineering space magic, gave me a headache halfway through. Can't even imagine the amount of work and effort you put into this video, and i'm actutally glad you decided it's not worth repairing/not repairing it just for the sake of the video. It's appreciated, no doubt about it. My mind is simply blown by how far you went in on this one, and the fact that you're sharing all this knowledge for free. But you still owe me a fire extingusher for the headache ;)
Haha nice
EE here too xd
I can only imagine myself replacing all the damaged components only to turn it on to see all of them burn up again.
@@MassimoTava lol, exactly. Recently had a cheap TPA3116 class d audio board fail on me, the chip went short-circut. Took the chip off, measured the resistance between VCC and GND and it was a ok. Soldered a new chip in and it instantly failed short-circuit when i powered it up. Obviously, something else was causing it to pop. So yeah, you can basically replace every single damaged component on the board, but you can only pray that it will work if you don't know what actually caused it to fail in the first place.
Lazar Šaronjić
A neat trick to prevent blowing up a (half) repaired amp, is to limit the amperage. You need bench power supply for that or use one of those cheap programmable voltage regulators. Search RD on AliExpress.
You can hear the excitement on his voice when the PSU starts to smell :D
When
@@humblehostile7946 2:59
PRE-LIKING cause a teardown of an 850W PSU from diodegonewild IS going to be WILD!!!!!!!!!
Yes!
It’s going to get quite a bit of attention from the gaming community. So a mix bag of very smart people, kids and trolls. Grab the popcorn.
@@MassimoTava you mean "BREAKING NEWS ENERMAX IS NOW OFFICIALLY TIER 5 FIRE HAZARD ROFLMAO"? certainly happened before
I pre-liked because of the cat
Hope DiodeGoneWild didn't get electrocuted since he hasn't out out any videos in a couple of weeks... hoping for the best. ;)
"This is dodgy, lets plug it in" This is why i love you . Stay safe though!
Super Dodgy
In general same what ElectroBOOM did 8 years ago :)
@@KrotowX Not quite. This stuff really CAN kill unqualified wannabe repairmen.
Even 3 yrs later, you still deserve credit for these schematic drawings. Must have taken a million years to prepare this video I guess. Always nice to see your cat help you
16:31 "So as you can see this power supply is properly exploded" I'm dead
I really love the fact that he doesn't use ads in his videos or sponsors, greetings from Bulgaria :)
Now, this proves that this is a Russian video... and he can't say filters correctly. dddddddr.
@@mark8664 no this is czech man
@@mark8664 The fact that he uses an oscilloscope made in USSR proves nothing. Those things were exported to other Communist countries too.
I really would like to see one day a collab episode with DiodeGoneWild, Electroboom and Photonicinduction. It would be extremely awesome :D
The closest internationally famous electronics TH-camr from DiodeGoneWild's location is probably Great Scott. However, a collab would be unlikely given their different preferences...
● Old tech / New tech
● AVR / Arduino
● Teardowns / New device builds
● Common sense for safety / Following safety regulations
Or how about Photonicinduction, styropyro, and Big Clive? or Big Clive, Franlab, and glasslinger? or System of a Down, Tool, and Rage against the machine... wait a minute, um... what were we talking about?
peace.
I’m just halfway the video and amazed by the detailed explanation given. It’s a lot to chew on but very interesting!
Your assumption that a screw might have caused a short circuit seems very plausible. Maybe something else broke down first and then after the first repair attempt the screw . . . ehm just screwed everything up.
Wow really dude XD
Yeah
My theory is a layer of moisture built up on the plastic sheet when the computer was off, shorted out the supply when it was turned on.
Could also be insects, those cause chaos in electronics too.
station240 It’s funny that the word ”bug” originates from actual bugs, beetles etc. causing destruction in vintage electronics.
@@Your_username_ I also quite like the idea of dead bug construction of circuits where components are soldered directly to each other.
Probably the most interesting voice and accent combo on TH-cam. Excellent video, thanks!
althrough gruaduate of an EEE years before, still attening the PC power reverse Engineering course now, thank u,DiodeGoneWild, your are a good lecturer.
What amazing insight and experience you bring to your videos. I'm studying EE and recently power supply design. I love what you are doing, your sense of humor (and your cat). Thank you.
Holy crap! That was super in-depth and understandable! Some of those circuit blocks are absolutely brilliant.
Keep up the incredible work!
The reason i clicked was because of 80+ Gold PSU so I thought this might get complicated for him but i was wrong
You are the king of the SMPS
Wow so informative! I have learnt more from your 40min video than at school for a whole semester. You should get more attention because this is gold quality content!!! I like your work keep it up!
@Против Глобал Of corse you learn, you learn exactly what will make you an slave of the matrix for ever by their spell
the inverter was a lot more simple than i expected. makes perfect sense to me, just never learned how it was done before so thanks for the explanation.. awesome video as usual. best channel for tear downs on You-Tube!!!
This person is just great. Being electronics hobbies I have an immeasurable amount of appreciation and for not only his knowledge but his generosity it making us so much amazing content. The bonus for me is no matter how shitty a day I have had, how stressed I am his accent makes it totally impossible to stay that way! So from me to DiodeGoneWild....thankyou brother!!
One of the best videos of this type I've ever seen. Packed with such a lot of useful information. Also looks like a good PSU for modding to run a remote solar powered computer set up, or just to use a PC on a vehicle, without having to resort to using an inverter. I'd guess many dead supplies like this have only the main switching section that has failed, so great for re-using and getting a second life as a battery powered computer PSU.
That was so funny...The cat....the primary paw, then the censored tail end....Very, very funny.
"do not open cover"
So we can't open it ...
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Just joking !!
You are a genius... Can never imagine someone understand such a complex supply and explain it
I have the same Makita:-) one go the best small battery driller and very strong:-) working fine over 8 years, and I'm using it almost everyday!
Grate video like always, thumbs up 👍
Love that long troubleshooting & explenation Videos from you. Great Video, thank you!
I've been looking fore something understandable about ATX power supplies since I'm into electronics. And finally after years I found it :D Huge thanks!
"I can smell something beeehrning"
LMAO
@@Poliacido 😂
Fantastic Video! Thanks for all your hard work. Extreme effort for sure. It is very much appreciated! I have a few repair videos and I try to explain what I can, but this is some next level digging in and understanding!
I work in a company where we design these power supplies with even higher power ratings. I am currently working on a 3kW AC-DC power supply. I really appreciate your knowledge and the ease with which you handle these things. I am new in this industry and I struggle to understand the supply if I don't have a schematic and PCB layout with me.
So I am curious to know if you actually draw the schematics from your own analysis? If that's the case then you are a super hero :D Plus, your cat makes the videos even more enjoyable!
First of all, take high definition photographs. Now zoom in and draw the circuit using layers in Photoshop. Proceed from there.
why are you guys underrated
The amount of knowledge and detail of your explanations are simple incredible, keep such a great work!! Hope one day I become at least a 50% as good as you are with electronics!!
Sir, you and your sense of humor make learning electronics a whole new adventure. I must donate !!!
"Octa-coopler" lol. Awesome video, incredible detail and a thorough explanation! Thank you!
WOW! A very clear and concise explanation of a very complex switch mode power supply!
Excellent job sir! You really know your stuff!
friend, please look at my diagram th-cam.com/video/sb7-gBqXJtk/w-d-xo.html
Really great information about pfc atx-power supplies. Thanks it was nice to watch and learn something.
And on Russian scope!!!
@@plamenpetkov6958 Yes :)
Wow! Watched the whole thing. You've got it down my friend. Wish i had your EE skills. Super informative vid. Keep posting.
*FULL BRIDGE RECTIFIER IS NOT A PUNY SINGLE DIODE!*
Uh oh. Now the full bridge rectifier jokes again !
Thanks, Dude. Excellent in every way. You're a natural teacher. Keep it up, please. Can't wait for future uploads. BTW, I have a Gigabyte badged power supply that I won in a computer magazine competion but blew up on first use. Haven't got the heart to throw it away, sentimental reasons, but happy to donate it to you.
Another very entertaining and educational video...thank you.
Awesome explanation my friend!! You sure know these confusing supplies very well. Love your humor on the subject as well. Thank you!!
OUTSTANDING - Xtal clear explanation. THANK YOU
I have a similar 750W P/S needing repair so I was looking forward to a full repair of the one in the video, but I understand the reasons for not doing so. Sometimes the damage is so great as to render any repair effort too costly in time and materials, especially when inexpensive replacements are so readily available. However, I do appreciate the detailed walk-through, and the experiments with the working sub-sections were very enlightening as well. Love the accent, BTW, it forces me to listen more intently and I therefore learn more.
I'd love the case, just empty. Then I could put my puny PSU in it, and impress people.
Thank you very much .you explain accurately and clearly . One of the best I have listened to here.
Excellent, as always you are really good at explaining different SMPS topologies.
Best video so far, I really enjoyed this detailed deep dive into the function of power supply components.
friend, please look at my diagram th-cam.com/video/sb7-gBqXJtk/w-d-xo.html
Thanks . It help me alot to knows the way of complexity powersupply how it work . This things take alot of time to know . Thanks
My respect for you is directly proportional to my misunderstanding of power supplies. 100%! Thank you!!
Thanks for sharing with us! Very complicated circuit, and you probably took some time to investigate all these circuits. Very nice!
Best lecture ever about power supplies , your video was very informative to me , a tons of knowledge , I wish you a good luck & thanks a lot .
I've been watching these videos lately. I'm really amazed at the skill and work that you have been giving in reverse engineering these
SMPS circuits. I've learned a lot on your videos specially on understanding the general design of these power supplies. I've really gained confidence in tinkering with these devices and understanding its complicated circuitry. With your video I have fixed several power supplies mostly ATX power supplies along with some exciting fireworks on the some. So with that I would like to say Thanks!
P.S.
Would it be possible to make a content on the common failures of these power supplies and what could possibly have caused it. Most of what I have fixed are failures on the capacitors at the output side. And those that made fireworks and big bangs are usually exploding NPN transistors at the primary side.
That oscilloscope is from the USSR. Man that thing is cool. I like Soviet era electronics and mechanicals.
This is exceptionally well explained. Thank you very much!
What an enormous video!!! You made my day. Thank you so much for your big lesson
Power supply videos are the best ! great explanation
Your awesome knowledge combined with your great videos steals many many hours of my free time. And it's worth every second! ☺ 👍Keep it up for a long time!
My trusty Cougar CMX 800W went south recently, with a loud bang, during an attempt of powering up a PC after a couple of weeks of standby.
I am watching this with a tear in my eye. But it has served me for some 6 years.
I will attempt an investigation after setting up a bench.
Caps exploding most likely. Good luck.
A bang when switching on (at the switch, not from standby) is quite often the inrush NTC. I had those explode quite violently a few times. You will know when you have pieces coming out of the PSU when opening it and a place with two component legs sticking out of the board ;) .
@@superdau i am sure it was not an inrush issue, i merely pressed power on button on the front panel of a pc. As i said, psu was in standby for weeks. Other tech in the same room unaffected.
Thank you so much man. You are the best electronic enginier that i know. I impatiently waiting for your next videos
DGW is so knowledgeable, he must have a doctorate in electrical engineering.
He 'only' studied economics, but his knowledge comes from 23+ years of experience.
It's possible to teach yourself so much through sheer passion and interest in a subject that a university course won't really teach you very much, in which case, why waste several years of your life (and vast sums of money, if you live in a country that doesn't believe in investing in its own future...) to learn basically nothing?
Unless you need the piece of paper in order to get potential employers to even consider your CV/résumé, anyway 🙄 (But thankfully a growing number of companies are accepting that people without a degree can be just as qualified - if not more so - than people without one. Experience is worth ten times as much as a degree for a lot of subjects!)
The best EE channel on youtube hands down!
Awesome vid, very informative, teaches A LOT of stuff. Please keep up the good work!! Liked, loved, digged, everything.
Primary advantage of old and cheap switching PC PSUs is (I think) that, being them relatively simple, they are quite easy to fix in comparison to newer and more complicated ones. This one is sort of an overkill on every aspect with many SMDs under the PCB and a lot of discrete controllers, not to mention the much more cramped space in which we would have to move. Enermax builds amazing PSUs which fail rarely, but they seem quite hard to fix if they fail.
Excellent video ! Congratulations and a big THANK YOU !
He is doing it right when he said "Do not remove this cover I'm just joooking"
A very good explanation ! Thanks for sharing !
Another Great video congratulations DiodeGoneWild :) ! Keep those vids coming! i already got the popcorn ready :)
Talk about going beyond the call of duty. I learned so much from this one video it's amazing. Thanks so much. PS. I love your accent, it makes me smile.
Very interesting learning about how these things work! Also answered why some newer PSUs have significantly different sound characteristics at low loads.
friend, please look at my diagram th-cam.com/video/sb7-gBqXJtk/w-d-xo.html
Best SMPS guide... bravo
I don't understand most of the thing you say, but still enjoy it.
Fantastic explanation on the Active PFC. I always wondered how that worked. It's more complicated than I expected!
friend, please look at my diagram th-cam.com/video/sb7-gBqXJtk/w-d-xo.html
Absolutely usefull to watch this video. There was a lot to learn about things totally new to me, especially in this detail. Exactly the usefull details, very clever and good to understand drawed and explained. Indeed, this was very worth watching with full concentration. Glad i did, and some of the most interesting bits i had to watch a second and sometimes a third time to get it really, to learn it usefull..
Oh I simply love this channel. His real usefull knowledge this clever diode teaches here, and even for free!?
suuuuch an amazing video. You are a genius!
Some people dont understand those thing. Others do but have no clue explaining it, because everything is so easy to them. you on the other hand besides beeing fun to watch because of you accent.. no i mean because of the things you have and use and do, are explaining it just step by step
Just exploded my PSupp fuse entirely - this vid is pure gold and the cat - that's a proper dude who makes space for his furball!
Excellent video, well explained and I learned so much. Thank you.
thank you for such a detailed description and explanation of the working, I want to build a similar supply for solar power panel in series with the power correction for open cicurt voltage.
Terrific video. I learned a mountain of information.
@DiodeGoneWild I'm glad you left your cat in the video. He or she looks so adorable.
Thanks for the PFC control explanation. Very Appreciated !!!!!!!!!!
You are becoming one of my favourite youtubers. Keep it up
I love this kind of videos !! Thanks for sharing !!!
Very helpful video 👍
Best commercial on why $200 is not too much money for a PSU
For 550W PSU this "850W" one will work fine. As some owners confirmed, on 60% load this PSU is even quiet. Obviously for real 850W find something better from price range above 250$.
A great explanation of a complex circuit
super gut verständlich erkärt!!
you got a nice project box with a fan 👍 I love switching power supplies, there is a lot of useful components to reuse ( if not blown 😂😂)
big blue thumb 👍👍
dude. you are very good at teaching. thank you.
you r very good elecronic man..look at the scematic make me mind blowing..goodjob
Nice video, though you didn't repair that power supply but you explained how it supposed to function in detail,
i really appreciate your effort, thanks.
Sir thank you for this GEM! You made me wanna check out may broken 650w PSU thank you!
Excellent walk-through.
Man....that was like being a kid and finding out where milk came from....I just lost all the magic of the "80+" and gold certified and why they cost so much....other than using more reliable components Its really not a expensive item to manufacture.... great job....DGW
They're more expensive to design. Plus the whole design is more robust and can handle more power, that's why they cost more.
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I loooove your battery backup idea. I may expand on that and make a... safe... version
Just FYI, the resonant half-bridge is used to reduce (eliminate) the switching losses of the mosfets. Thanks for the amazing videos and keep safe. Seeing you test 360V dc so casually raised my heartbeat.
friend, please look at my diagram th-cam.com/video/sb7-gBqXJtk/w-d-xo.html
Thank you. I finally understand the Power Factor
this was an excellent video , i learned a lot , thank you for it .
Wow! Another great video. Thank you.
Excellent video. It's Big Clives poundshop powersupply teardowns on steroids. I learned some new stuff here. Subbed.
This video is insanely well done. Ty.
I'm trying to learn how to convert a reg psu to run off 12v dc input instead of 120v ac
Bravo! Absolutely fascinating, useful and thoroughly enjoyable. This 50 year old ET found it easy to follow and well worth watching but think any ITS, Raidioman, or RC Hobbist would really benefit from this High Power Switching ATX Power Supply works. Nice forensics too on how you identified the likely failed components and used clues to identify the source of the short. #electronics #maintenance #powersupply
Splendid explanation!
What a huge investigative work! Great review and lots to learn here. I think it was a good decision not trying to repair this one ;-)
I like that Soviet made oscilloscope that you are using - Sdelano v SSSR. You are doing wonders here with electronics bro, keep up the good work !
You are very well trained in electronics.