24V 1000W power supply - autopsy (transformer, GDT, capacitors)

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  • Опубліковано 2 вер 2021
  • Today, the autopsy of the important components of the 24V 41.7A 1000W switching power supply from eBay. I opened the primary smoothing capacitors, which are apparently fake Nippon Chemi-Con, actually, used relabelled capacitors desoldered from e-waste (scrapped electronics). I also opened and reverse engineered the main power transformer and the GDT (gate drive transformer). I measured the winding inductances, checked the insulation safety, counted the numbers of turns and measured the wire diameters. I checked the capacitances and ESR (impedance) of all electrolytic capacitors. I also checked whether the transformers, the output inductor and the EMI inductor use copper or just copper coated aluminium (CCA). I also reverse engineered the gate drive circuitry of the power MOSFETs, quite a questionable design.
    The first episode - what's inside:
    • 24V 1000W power supply...
    The previous episode - test & measurements:
    • 24V 1000W power supply...
    My DIY inductance meter:
    danyk.cz/lmetr_en.html
    Please support me on Patreon:
    / diodegonewild
    My Instagram:
    / savage_danyk
  • Наука та технологія

КОМЕНТАРІ • 244

  • @w04h
    @w04h 2 роки тому +22

    The cat shot was amazing

  • @Miata822
    @Miata822 2 роки тому +41

    That power transformer is pretty nice, at least for being a no-name Chinese Ebay/AliExpress special.

    • @sthandiwe7825
      @sthandiwe7825 2 роки тому

      Ferrite core or High frequency transfomer

  • @msansjr
    @msansjr 2 роки тому +97

    It would be nice if gamer's nexus sent you a gigabyte power supply that has been exploding so you cold look into it!

    • @jogurcik13
      @jogurcik13 2 роки тому +7

      This

    • @bashaaksema94
      @bashaaksema94 2 роки тому +2

      Yes

    • @SianaGearz
      @SianaGearz 2 роки тому +3

      That would be interesting. GN has had offers from viewers from around the globe to send in their PSU. If they haven't cashed in on an offer from EU yet, they can divert it to DGW.
      Actually the publication that raised the issue first was TechPowerUp, and their editor from Greece, Aris, who was previously at Tom's Hardware US/Global before that publication self-destructed spectacularly. He also has his own YT channel Hardware Busters. He too, i seem to remember, would have liked to see more of these PSUs to come to more solid conclusions, but didn't necessarily have the budget for it.
      Unfortunately the PSU comes in several varieties which you can't necessarily just tell apart; some are by all reason adequate, others appear to have some issues with transistor quality or gate drive which leads to potential self-destruction. And if you do get a unit which operates correctly, there isn't a lot you can conclude from it.

    • @joseppuig925
      @joseppuig925 2 роки тому +6

      I'd love to hear the "that's niiicee" and "now it's properly blown!" as he examines the gigabyte psu

    • @keithking1985
      @keithking1985 2 роки тому

      why is that a common problem with those PSU's???

  • @stanimir4197
    @stanimir4197 2 роки тому +2

    Outstanding work, man. Kudos!

  • @saalkz.a.9715
    @saalkz.a.9715 2 роки тому +8

    10:26 😼 "His video-recording skills are getting better and better..."

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      If DiodeGoneWild forgets something the cat will always be mad at him!

    • @saalkz.a.9715
      @saalkz.a.9715 2 роки тому

      @@Zebra_Paw Well Of Course, the cat is the real boss here... 😁

    • @1pcfred
      @1pcfred 2 роки тому

      He's evolving backwards.

  • @zeusantony5027
    @zeusantony5027 2 роки тому +1

    Your patience and persistence are admirable. I much enjoyed the complete deconstruction of such a poorly made product. The cat is super too.

  • @artursmihelsons415
    @artursmihelsons415 2 роки тому +12

    This power supply was pretty good build.. Needed only modifications for driver circuit and input capacitors replacement.. I've seen worse.. 😂
    Great autopsy video! 👍

  • @FindLiberty
    @FindLiberty 2 роки тому +2

    NICE and THOUROUGH - You REALLY know your stuff! Thanks for sharing.

  • @michaelfisher9671
    @michaelfisher9671 2 роки тому +15

    High quality transformer it almost seems a shame to have dismantled it.
    More explanation of why GDT’s are used, and of the different systems for driving them (which you showed briefly) would be great.

    • @mayankvaidya6597
      @mayankvaidya6597 2 роки тому

      ગુજરાતી માં બોલો

    • @DuroLabs85
      @DuroLabs85 2 роки тому

      Yes he should make detailed video about it. I also want to learn about those. : )

    • @stanimir4197
      @stanimir4197 2 роки тому

      "High quality"? It has no power factor correction - effectively it's illegal in the EU (and UK). The primary caps are leaking already. Gate drivers are a joke. The fan is overdriven to hell and back. It's a trash bin material... just not 'super dodgy' level.

    • @michaelfisher9671
      @michaelfisher9671 2 роки тому +5

      @@stanimir4197 “transformer” dude, not power supply. Calm down and read carefully!

    • @stanimir4197
      @stanimir4197 2 роки тому

      @@michaelfisher9671 I did - it just didn't make sense - the secondary caps were fine too. The filtering choke was fine too but got properly scratched, etc. Having the transformer alone being decent won't do much good.

  • @zjoesmoe2670
    @zjoesmoe2670 2 роки тому +1

    This is my favorite inspecting components for fraudulent parts very interesting thank you

  • @The_Hanter
    @The_Hanter 2 роки тому +1

    Jako nadšenec pro CRT TV se úpřimně těším na video s opravou a doufám, že to bude složitější oprava jako pouze klasika ve formě výměny elektrolytů ve zdrojové části 😁

  • @randydicotti3975
    @randydicotti3975 2 роки тому

    Another valuable and informative video. Thank you !

  • @d614gakadoug9
    @d614gakadoug9 10 місяців тому

    I've used a transformer gate driver, with push-pull drive for the primary, in several designs.They preform really well if done properly - better than anything using a bipolar transistor for turn-off speed-up. The FET that is to be turned off actually has its gate driven negative with respect to its source, so turn-off is fast. Driving the gate negative makes the FET much more immune to partial turn-on in bridge or half-bridge designs where the source of the upper FET is connected directly to the drain of the lower FET. Just considering the lower FET in a half bridge: At the time the upper FET is turned on, the lower FET has been off for some time. The very rapid rise of voltage on its drain can couple sufficient energy,via the drain-source capacitance to charge the gate, relative to the source, to the threshold voltage. But with direct transformer drive the gate has actually been driven negative with respect to the source by the time the drain voltage begins to rise, keeping the FET securely off.
    The best performance, though at higher winding cost, comes form using a high permeability ferrite toroid for the gate driver transformer. Properly wound, both leakage inductance and magnetizing current can be made very low
    it is VERY difficult to actually scope the waveforms at FET gates in such a circuit unless you use a high-bandwidth differential probe with adequate common mode voltage range.

  • @andredebacco
    @andredebacco 2 роки тому

    Hi, I really appreciate all your videos, they are very instructive, you learn a lot. I would like to suggest an important point to be analyzed in transformer autopsies, which is, in addition to measuring inductance, measuring leakage inductance, as well as ways to minimize it. I would also like to say hi to your pet cat!

  • @__MINT_
    @__MINT_ 2 роки тому +2

    You could also use a shunt to see how horrible the current waveform without a PFC is (under the full load).
    Anyways, thanks for the video!

    • @DiodeGoneWild
      @DiodeGoneWild  2 роки тому +1

      It would be about the same as in the 600W power supply:
      ua-cam.com/video/tQRxEywlhyU/v-deo.html

  • @OldSkoolF
    @OldSkoolF Рік тому

    Great video... more sparks please.. like discharging caps or plugging in..

  • @mohalothman99
    @mohalothman99 2 роки тому

    I wonder if heating the ferrite core will change its magnetic properties?

  • @d.k.9406
    @d.k.9406 5 місяців тому +1

    Danke! Thank You!
    Very informative.
    Of course inclusive
    dodgy damaged reused parts..
    One day we will probably see proper refurbished parts like the smartphones nowadays XD
    It may be interesting for many
    somehow
    a basic walkthrough how to choose or calculate a GDT and the GateDrivingCircuit
    You gave some examples..
    Maybe explaining the dis-/advantages of them?
    In of course an all be loved Bloody long video ❤

  • @Alchemetica
    @Alchemetica 2 роки тому

    Thanks for the video it is a great autopsy.

  • @michaelseitz8938
    @michaelseitz8938 2 роки тому +7

    Thanks, that was another interesting autopsy. Could you lick the electrolyte of the big capacitors and the brown stuff on the circuit board to confirm your suspicion? :-D

    • @1pcfred
      @1pcfred 2 роки тому +1

      This isn't the Ben Heck Show.

  • @Arhentir
    @Arhentir Рік тому +1

    Maybe Zobel RC filter network will help GDT totem pole driver ?

  • @douro20
    @douro20 2 роки тому

    The MESR-100 is a decent meter but it only has a 100kHz measurement frequency.

  • @foobarables
    @foobarables 2 роки тому

    The slow rise and fall time measured at the gate drive transformer output creates a dead time. Also, the power MOSFET's might be switching much faster than rise and fall time measured at the gate drive transformer.

    • @DiodeGoneWild
      @DiodeGoneWild  2 роки тому

      this is a forward, not a halfbridge...

  • @kopauns7607
    @kopauns7607 2 роки тому

    Hello Dany. I watched all your power supply videos as I'm trying to repair my smps with a very strange problem. It doesn't start and looks dead, but when I touch the input capacitor with multimeter it starts right away and works stable. If I remove mains power for few seconds it shuts down and wont start until I touch the input cap again. I tested all components and soldering points, all seems to be ok. Any idea what could be the problem? Thumbs up from Poland👍

  • @martinleska4292
    @martinleska4292 2 роки тому +1

    16:12 Rusty or brown - dirty stuff on board is probably residues from some soldering agent which was sprayed on bottom of board / of board was dipped in this fluid before soldering wave. When board goes through soldering wave, residues flow through holes on top of the board. This board doesnt pass through washing or cleaning process after soldering. Sometimes this residues are corrosive and could totally destroy board in weeks or months after manufacturing by eating terminals of components.

    • @1pcfred
      @1pcfred 2 роки тому

      Flux should not remain on the board after it has been wave soldered. We used to throw all the boards we made into a dishwasher to clean them. Flux we used was water soluble. There's a bubbler the boards pass over before they hit the wave. The bubbles is the flux.

    • @d614gakadoug9
      @d614gakadoug9 10 місяців тому

      Rosin-based fluxes vary from pale yellow to quite brown. Generally it is quite acceptable to leave the residue on the board unless the board is to be conformally coated, subjected to quite adverse conditions or has high impedance circuitry. In days gone by there were often massive amounts of flux residue on consumer electronics boards.
      Water soluble fluxes use organic acids as activators (as do rosin fluxes, but those in the water soluble fluxes are much more aggressive). Residues of such fluxes MUST be removed with a few hours otherwise they become very difficult to remove. These fluxes tend to be quite electrically conductive and will definitely cause corrosion. Proper washing is not a trivial process, especially on surface mount boards where residues tend to get trapped under components and not removed properly without fairly forceful water impingement. Power supply boards may not be washable, primarily because of the transformer. It may be OK, but it has to be evaluated very carefully.

  • @jean-francoiscaron5706
    @jean-francoiscaron5706 2 роки тому

    I'm interested in this generic yellow sticky tape that seems to be used in all the cheap transformers. Is it all the same stuff? Is it actually any good in terms of dielectric strength (or just tear-resistance)? Does it come in blue?

    • @mfbfreak
      @mfbfreak 2 роки тому

      It's probably all roughly similar. My starting point for information about technical tapes is 3M's website.
      3m has polyester tape such as type 1350F-2, and its dielectric strength is 7kV for a 254µm thick tape. You still often want to use at least 2 layers of tape, just in case there is a microperforation in the tape.
      This tape is for use up to 130 degrees, but you can also get kapton/polyimide tapes for up to 155 degrees C.
      I really like 3m's products, but they sure are expensive!
      Of course, if you buy from a chinese bottom feeder, you never know for sure what kind of tape it is. It might very well be just normal packaging tape with a yellow glue layer. If you wanna buy from china and have reliable products, you really have to have personal contact with the factory.

  • @FaZuQ
    @FaZuQ 2 роки тому +1

    This PSU reminds me of Dell PSUs, sold in China, after mining (there are random quality components)

  • @martinjimenez821
    @martinjimenez821 2 роки тому +4

    I would like to see how to make an small flyback smps, i burned a lot of HV transistors :(
    Great video as always :)))

    • @ToleSan
      @ToleSan 2 роки тому

      same here

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +2

      @@ToleSan It is not difficult though. First thing you need to know is that when you are testing put it in series with a 100W tungsten lamp (unless the PSU is like 150W) and if shorted the lamp will light up instead of your circuitry dying. Don't worry about it lighting up a little bit under the load.

  • @ryanb1874
    @ryanb1874 2 роки тому

    Van you do a video where you describe with math how much work it would be to power factor correct a 250 KW inductive melt furnace?

  • @alphadog6970
    @alphadog6970 2 роки тому

    Now this was a good video

  • @BogdanSerban
    @BogdanSerban 2 роки тому +2

    The GDT inductance seems way too small, when I build them I go for 500uH-1mH, otherwise the waveforms are very distorted

  • @ameristanbouli5063
    @ameristanbouli5063 2 роки тому

    we love you man keep it up and thanks ..

  • @moizahmed4562
    @moizahmed4562 2 роки тому

    can you please tell me where can I find the final schematic of the sstc tesla coil from your sstc tesla coil series please answer. I cannot find it.

  • @victorbil3899
    @victorbil3899 2 роки тому

    Hi all ! please tell me what is the name of the tape that the secondary winding is wound with? I cannot find a similar copper tape anywhere on sale. Thanks in advance !!

  • @dragoscucu3128
    @dragoscucu3128 Рік тому

    As I remember, 12V fans are failing at about 28V. When the output capacitors wear out, the ripple will probably destroy the fan

  • @airmag
    @airmag 2 роки тому

    Whose English accent has been effected after watching this guy's videos? I think mannyyy of youuuuu. But it's so cyuteeee, I can't stop speeeaaking like hiiiim.

  • @Basement-Science
    @Basement-Science 2 роки тому +2

    That gate drive circuit is just amazing. Not even a (bidirectional) Zener for the mosfets, but a 10k pulldown for no reason at all. They rely on the gate discharging through the transformer, which, unless I'm getting things confused, will induce current that opposes the opposite mosfet from turning on and slows things down.
    Now I'm wondering if they even use any deadtime on the drive signal. Might not be strictly necessary.

    • @Graham-ce2yk
      @Graham-ce2yk 2 роки тому +1

      That pulldown could be a case of someone working from a schematic without an understanding of what the schematic entails. I remember watching a BigCliveLive video where he was putting together a lightbulb from a kit and noted that some of the supplied components didn't make sense given the loads the thing he was building was supposed to handle, he suspected that whoever put the kit together was working from a second or third generation copy of whatever the original schematic and misread some values.

    • @tactileslut
      @tactileslut 2 роки тому +1

      Showing variations by flipping cards on sticky tape hinges was a nice touch.

    • @analoghardwaretops3976
      @analoghardwaretops3976 2 роки тому

      Without that 10k "bleeder" that MOSFET won't live long..it can "DIE" even before you give it a gate pulse...

    • @Basement-Science
      @Basement-Science 2 роки тому

      @@analoghardwaretops3976 Why would it? It is already almost shorted (at DC) to source through the gate driving transformer. That 10k contributes nothing to that.

    • @analoghardwaretops3976
      @analoghardwaretops3976 2 роки тому +2

      Theoretically..it may not require it in this app. but it is one extra level of protection...that doesn't add much to the cost..and is most effective when the 10k is wired directly on to the g-s pins , & not through pcb traces..
      For the benifit of those who are not aware of the device behaviour...
      Any MOSFET has an insulated gate.....in this case..it's METAL OXIDE... this insulated gate has intrinsically built in 2 capacitors... which is a part of manufacturing process and cannot be avoided or removed...else we wouldn't have "MOSFETs..."
      same goes for I.G.B.T.'s.....
      Most commonly used and easier to manufacture.., with more simpler drive circuitry are the
      " ENHANCEMENT MODE" MOSFETs type...
      So in the case of MOSFETs... there is one Gate- to -Drain capacitance...the other being Gate -to -Source capacitance ....
      The Drain - Source " channel" , is not open circuited , with no drive/ bias/ signal..but does have a very high resistance....
      @ power up..that " high dc" potential...leaks a current to charge up that insulated gate.....
      Once that gate is sufficiently charged .. i.e. V-gs turn on threshold is reached.... the MOSFET will turn on..even when there's no valid gate drive command given...
      With the " bleeder " resistor (10k) across g- s , it having a very much lower resistance than the D-S , that charge is
      " bled " off/ diverted from the gate..to source..keeping it below V gs threshold..., thereby protecting the MOSFET ..

  • @farenikerimator5644
    @farenikerimator5644 Рік тому

    Can you make a video rewinding it and fix it?

  • @keithking1985
    @keithking1985 2 роки тому

    could they not of used a resistor divider/voltage divider on the fan? 2 small resistors wouldn't have broke the bank...
    CLASS VIDEO.. : ) i loved the different ways you showed us to use for the output. classic diode gone wild...

  • @AmatorElektronik
    @AmatorElektronik 2 роки тому

    Nice job

  • @analoghardwaretops3976
    @analoghardwaretops3976 2 роки тому +1

    Your mention about the "steering circuit" of the gate drive transformer..being " poor design".....
    ( 15 ohm/ diode/ 4E7ohms/10k ) I.M.H.O. I don't think it's inadequate...
    I've seen very similar one on primary side power tx. used in an ( active 2 way) 1500W ..& in last 5 years service field not come across any of those failing..or contributing to any failures...
    my reasoning being the winding resistance being sufficiently low to properly turn it off..in fact faster because of polarity reversal..
    the alternate circuit you drew...
    (PNP turn- off default..) is normal standard in gate driver's powered from dc source...that's as reliable..but can turn off to zero only.. not negative...

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      the problem is probably the transformer itself, way too low inductance!

  • @Langendimi555
    @Langendimi555 2 роки тому +2

    That was actually a nice transformer!

    • @1pcfred
      @1pcfred 2 роки тому

      That transformer is why the PSU worked. It had nothing else going for it really.

    • @stanimir4197
      @stanimir4197 2 роки тому

      @@1pcfred c'mon the output filter caps were ok, also 50V.

    • @1pcfred
      @1pcfred 2 роки тому

      @@stanimir4197 I can't even find that company on the Internet. Niani? I don't know why they bothered to trademark the name. They're not even using it except on those capacitors.

  • @simontay4851
    @simontay4851 2 роки тому +1

    Are you going to put it back together? If yes, are you going to populate the missing fan control circuitry.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      I feel like unless people are all mad at him about not remounting it, he won't do it!

  • @MC-01
    @MC-01 2 роки тому +3

    Can you make an autopsy for the MeanWell Power supply from the Pirl Charger

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      This is so old... I like the fact that you brought this back. He does keep this so he could. Now don't expect him to make an autopsy of its transformer because he is using the Pirl charger.

    • @1pcfred
      @1pcfred 2 роки тому

      It'd be a shame to wreck a decent PSU.

  • @electroumit
    @electroumit 2 роки тому

    Thank you.

  • @frogz
    @frogz 2 роки тому

    this was both really good and really sketchy, at the same time

  • @lirimi23gamescool
    @lirimi23gamescool 2 роки тому

    Can you do a video about vfd-s
    You never covered that topic on your channel

  • @Franco_FC
    @Franco_FC 2 роки тому +1

    Hello DiodeGoneWild, I wanted to know if you can put twice as many transistors in parallel to a power supply, in order to distribute the load, is it possible without any other modification?
    Another question is if you can make a video modifying the current protection of a source, in order to increase it ...

    • @jms019
      @jms019 2 роки тому +2

      Generally no as the hotter one takes more of the load and potentially runs away especially if they were taken out of a dustbin to start with so unmatched

    • @simontay4851
      @simontay4851 2 роки тому +3

      You have to put a low value (

    • @jms019
      @jms019 2 роки тому

      As for the second original question of this thread if you’re asking that whatever you’re trying to do won’t go well

    • @Franco_FC
      @Franco_FC 2 роки тому

      @@jms019 modify the amperage detector, but so that it withstands minimal sudden surges as when starting an engine for example ...

    • @jms019
      @jms019 2 роки тому +1

      @@Franco_FC This is likely to make the thing unstable. Think Tacoma Narrows. It’s impossible to generalise a design that will work on next week’s random Chinese power supply. For more detail go study control theory.

  • @joseppuig925
    @joseppuig925 2 роки тому

    Question: what happens if you power an uncanned electrolytic capacitor?

    • @anthonydenn4345
      @anthonydenn4345 2 роки тому +1

      It probably just drys out quicker than it would being enclosed.

  • @douro20
    @douro20 2 роки тому

    Have you tried your old Czech hair dryer?

  • @Paxmax
    @Paxmax 9 місяців тому

    Oof! 1kW and no pfc, RIP voltage stability. So the avg current from wall 4,4A but only pulling current on peaks so about a 10-12 amps hump!

  • @marillima6350
    @marillima6350 2 роки тому

    Thanks for video

  • @mototola86
    @mototola86 2 роки тому +1

    How many fire extinguyshers where used???

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      None this time surprisingly!

    • @mototola86
      @mototola86 2 роки тому

      With so many "recording errors"
      🤣😂😅

  • @gianluca458
    @gianluca458 2 роки тому +1

    This power supply seems a little bit better... But there are still bad things... The 250V capacitors and the distorted un euqwaveforms [And the 26Khz problem.] And of corse, a super noisy non-temperature-controlled ovedriven fan...
    Its surprising that all windings are copper! [inductor included].

  • @mfbfreak
    @mfbfreak 2 роки тому

    Counting the windings makes me think about Count von Count of Sesame Street. Just needs more Ha Ha Ha!

  • @jayvadgama3703
    @jayvadgama3703 2 роки тому +1

    Hi diode gone wild in your others channel I watched lots of video and in that videos I found some background song and I loved that background songs unfortunately my song recognise app (Shazam) doesn't recognise that songs so can you tell me what songs do you used in that videos?

    • @johncoops6897
      @johncoops6897 2 роки тому +4

      I have a piece of string in my hand. Can you guess the colour and length of my string?
      OK, now how could anybody possibly guess what video and which song you are talking about?

    • @simontay4851
      @simontay4851 2 роки тому +2

      Post a link to the video then someone might recognise the song and tell you what it is.

    • @jayvadgama3703
      @jayvadgama3703 2 роки тому +1

      @@johncoops6897 in his old videos he played his songs from pc/MP3 player and if he listened that songs to many times I think he can recognise that.

    • @jayvadgama3703
      @jayvadgama3703 2 роки тому +1

      @@simontay4851 here is tha videos that I liked it's song :-ua-cam.com/video/uR0MtGefqU0/v-deo.html in this video he makes an tube Pre amplifier and when he played the song just about 3 or 4 second I am liking the song but no music recognise app can recognise.and here is second video
      :-ua-cam.com/video/9RBnn8ydwRw/v-deo.html
      In this video he showed his tv signal is lagging, after hearing that song even it lagging I am liking it but still recognise app can't recognise it, I tryed video pause and google lence to recognise the man in this song but it doesn't worked ither.and I love to find new songs and music so I am curious.

    • @johncoops6897
      @johncoops6897 2 роки тому +1

      @@jayvadgama3703 - Now I see you have answered the questions. So have edited this comment.

  • @lordsamich755
    @lordsamich755 2 роки тому

    I didn't know English words could be written in Cyrillic... but now we know.

  • @Jackson-mm8ep
    @Jackson-mm8ep 2 роки тому +1

    Comment: that transform was actually very nice
    .
    .
    .
    .
    Powersupply: am I joke , seriously?

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      The whole device was good... but I am not sure if the rating is really 1000W... he should have tried putting a buck converter in series with the fan and see if it still runs good at 1000W without overdriving the fan.
      In those power supplies you also want to redo the soldering, it's always quite poor.

  • @zts9383
    @zts9383 2 роки тому +1

    Proč mi to nabízí jen nizozemštinu do překladače titulků?

  • @-yeme-
    @-yeme- 2 роки тому +1

    To confirm genuine or fake caps you can check the physical spec on the datasheet for the series they claim to be on their shrinkwrap. Datasheets always give precise size, lead or pin pitch and mass measurements, if the caps are recycled ewaste masquerading as Nichicons or Nippon Chemicons etc they wont match the spec.

  • @johncoops6897
    @johncoops6897 2 роки тому +2

    The word "autopsy" means *_an examination to discover the cause of death_* .
    However this PSU wasn't dead. So this is more like an inspection :-)

    • @DiodeGoneWild
      @DiodeGoneWild  2 роки тому +10

      With a 12V fan running at 24V, it was a walking dead ;)

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      @@DiodeGoneWild As you said, all those power supplies always have a hidden disaster you have to fix :D
      P.S. I wonder if it would survive at 1000W with the fan spinning at its normal speed. I also wonder whether this is really supposed to handle 1000W. The last one was a 360W model, not 600W at all.

    • @tonywalton1464
      @tonywalton1464 2 роки тому

      @@Zebra_Paw In part 1 he draws attention to a warning label saying that it's recommended to only run it at 80% of rated power. Which makes it an 800W power supply. I wouldn't be impressed by a pint glass which was only recommended to hold 80% of a pint 😐

    • @johncoops6897
      @johncoops6897 2 роки тому

      @@DiodeGoneWild - At the start of the video we could hear it *SCREAMING* _"please don't dissect me, I am OK, please NOOOOoooooooo...."_ !

  • @JunPTechnician
    @JunPTechnician 2 роки тому

    Watching here sir sending full support.. New supporters here

  • @michaelathens953
    @michaelathens953 2 роки тому +4

    If those are legit nippon caps I'll eat my freaking hat.

    • @1pcfred
      @1pcfred 2 роки тому +3

      They looked a bit dot matrixy to me. The sleeves on real Nippin-Chemicon caps are solid print. Plus they don't make that value capacitor at all. So there's that.

  • @hullinstruments
    @hullinstruments 2 роки тому

    Wonder how those caps would have measured with your esr meter

    • @johncoops6897
      @johncoops6897 2 роки тому +3

      If you actually watch the video, then you would find out.

    • @hullinstruments
      @hullinstruments 2 роки тому

      @@johncoops6897 My apologies good sir. I was taking care of my dying mother and must’ve missed that part of the video.

  • @lauraiss1027
    @lauraiss1027 2 роки тому +1

    I think these Asian engineers are the best in the world, because in comparison to all other world, they have not only to build stuff but make it as cheap as toothpick.

    • @SianaGearz
      @SianaGearz 2 роки тому

      I think saying that this PSU "works" is a bit of a stretch. It's thrown together from junk, seemingly fairly mindlessly, not well adjusted; that it runs at all may be more or less coincidental, it's way off spec in the gate drive and fan supply. It couldn't be expected to work for very long.
      Obviously there's a lot of companies there who can build you perfectly adequate products, but adequate products come with an adequate price tag, they aren't scary cheap.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      @@SianaGearz The last power supply he reviewed was 360W... he looked for the cheapest 600W, he got scammed. He still doesn't know it, he thinks it was just a bad unit.
      This one is probably also not meant to be 1000W.

    • @SianaGearz
      @SianaGearz 2 роки тому

      @@Zebra_Paw Who, DiodeGoneWild? Don't underestimate him like that. He's been an SMPS expert for i think around 20 years, give or take a few, he has been maintaining an SMPS design website since 2002. He buys these things because he knows that they're junk, he is just curious to find out why they're junk and show us lot. He's just having fun with these things.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому

      @@SianaGearz Yes but I know those, he looked for the cheapest 600W one not to waste too much money and got scammed. It handled 360W fine though, because it was a 360W PSU.

  • @someone8944
    @someone8944 2 роки тому

    I didn't know electrolytic caps were just a metal casing wrapped in plastic on the outside

  • @DuroLabs85
    @DuroLabs85 2 роки тому +1

    Doee anyone knows what is the model of the main tranformer ? I want to buy that tranaformer for my project.

    • @LMB222
      @LMB222 2 роки тому +1

      Model is ACME ;)

    • @ToleSan
      @ToleSan 2 роки тому

      thats PQ Cores. But not sure the detail of it. You can search by internal core diameter

    • @DuroLabs85
      @DuroLabs85 2 роки тому +1

      @@ToleSan ok i just wanted to know the name. :)

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      @@DuroLabs85 Well... there are a lot of things you need to know before building a such thing!

    • @DuroLabs85
      @DuroLabs85 2 роки тому

      @@Zebra_Paw Ya you are true but I just wanted to know what transformer was called I got the datasheets online and now I can continue my calculations : )

  • @Jackson-mm8ep
    @Jackson-mm8ep 2 роки тому

    No meters were harmed in making of this video .

  • @dave0smeg
    @dave0smeg 2 роки тому +1

    For such a high wattage supply, there are very few components. Rather like the cheap Chinese knock-off computer power supplies.

  • @LimbaZero
    @LimbaZero 2 роки тому +1

    That almost sound like some 48v fans. maybe it's 24v industrial but marked for 12V for for computer use

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +2

      it obviously isn't. If you buy two times the same PSU from the same Ebay listing they won't be identical, they use random crap trust me!
      As he said in another video, they all have their own hidden disaster, that you better fix before even powering them. Also the soldering tends to be poor. I may be biased because I hate almost every soldering that isn't nicely handmade, but for those power supplies I'd really say redo the soldering!
      you might want to add themal paste as well in some cases, but not too much of it if there are already thermal insulation pads.

    • @1pcfred
      @1pcfred 2 роки тому

      it sounds like a 12V fan running on 24V to me.

    • @LimbaZero
      @LimbaZero 2 роки тому

      @@1pcfred That sounded like normal 12V 2.5A delta fan. Also too familiar with 48V fans that will nicely slice your fingers and these make more worse noise if you run 100% pwm :)
      Edit:
      Also seen cases where 12V fan designed as 12V small current and it was run with 18-20V -> smoke in 2-5 min.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому

      @@1pcfred it is

    • @1pcfred
      @1pcfred 2 роки тому

      @@LimbaZero that fan sounded like it was running fast to me. I have heard some noisy old Delta fans. I think the major reason they were noisy is because they were old with beat bearings. The old fans were serviceable though. You could pop the impellers out of them and lubricate the bearings. They had lock rings in them that you could get out.

  • @lightbulbgonewild3205
    @lightbulbgonewild3205 2 роки тому

    I'm scratching the hell out of it

  • @pritikanadas3140
    @pritikanadas3140 25 днів тому

    RIP 1000 watt power supply 😢

  • @celsoneves2368
    @celsoneves2368 2 роки тому

    Top beauty!.

  • @jkobain
    @jkobain 2 роки тому

    Copper-clad aluminium is so annoying when they use it in UTP cables or coils.

    • @1pcfred
      @1pcfred 2 роки тому

      Used Tractor Parts?

    • @jkobain
      @jkobain 2 роки тому

      @@1pcfred yeah, unshielded twisted pair.

    • @1pcfred
      @1pcfred 2 роки тому +1

      @@jkobain oh OK. I tried doing a search on UTP and that one didn't come up for me.

  • @margarita8442
    @margarita8442 2 роки тому +1

    would throw it away

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      would never... would make it better

  • @doctorspicer1042
    @doctorspicer1042 2 роки тому +1

    Plot twist its electro boom 😉

  • @andymouse
    @andymouse 2 роки тому

    Yeah ! fix a telly....cheers.

  • @electronicshaverightstolive
    @electronicshaverightstolive 2 роки тому

    Niiiiice😀

  • @anwarpspsanwar
    @anwarpspsanwar Рік тому

    1000. W. 12v price &. Availability.

  • @fabriziobrutti1205
    @fabriziobrutti1205 2 роки тому +2

    So it wasn't that bad, right?

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +3

      It was quite nice. Just need to fix the overdriven fan with a buck converter, and probably redo the soldering.

    • @fabriziobrutti1205
      @fabriziobrutti1205 2 роки тому

      @@Zebra_Paw yes... Maybe also replace the primary caps

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      @@fabriziobrutti1205 Not really necessary but worth it

  • @rilosvideos877
    @rilosvideos877 2 роки тому

    Seems the first main transformer of chinese PSU made of real copper! Are you kidding me, guys? Probably they got it from some scratch occasionally...

  • @hendriagustian7082
    @hendriagustian7082 2 роки тому

    Unboxing, but not damage

  • @TheJavaSync
    @TheJavaSync 2 роки тому +2

    I prefer pwm mode instead noisy hair dryer.. lol

    • @DuroLabs85
      @DuroLabs85 2 роки тому +1

      Lol.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +2

      @@DuroLabs85 Putting the transformer in water might not be the best idea... but yes his PWM technique was cool :)

    • @TheJavaSync
      @TheJavaSync 2 роки тому +1

      I can't.find the exact video, I watched almost all his videos, but he said that dis is the pwm mode - I did it also when I disasemble the ferit core - cheers & enjoy!! ua-cam.com/video/tWG0SNYzFRI/v-deo.html

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +2

      @@TheJavaSync I know this video as well, but can't remember which one it is.

  • @hernancoronel
    @hernancoronel 2 роки тому

    The opinionated cat is the best! LOL!

  • @darrenslab5537
    @darrenslab5537 2 роки тому +2

    Those caps could just have come from a box of surplus, snap on caps that size come in boxes/bags and can dent each other pretty easily if they aren't stored/handled properly

    • @SianaGearz
      @SianaGearz 2 роки тому +1

      The label on them is also not genuine, because it has halftoning, looks a bit like dither. The genuine labels are all vector designs and are tack sharp with no dither or halftone. Someone edited this label in Photoshop before being sent to the printing company! The dent is also not a little dent, it's a pretty violent dent. Plus that solder blob under the label of one of the caps, which had no way of getting there from a genuine factory! Third, the caps claim to be Nippon Chemicon ones, but then they should have a different shaped vent, not a plain X shaped one, and it should be exposed rather than covered by a card.

    • @anthonydenn4345
      @anthonydenn4345 2 роки тому

      @@SianaGearz It'd be cool if you could analyse the electrolyte used to determine the manufacturer eh.

    • @1pcfred
      @1pcfred 2 роки тому +1

      @@SianaGearz I've seen real Nippon Chemicon capacitors that had the disc on top of them. The vent slits on real Chemicon caps are usually deeper. I'd say the sleeves are definitely counterfeit being as Chemicon doesn't even make that value cap. Plus the graphics are all wrong. They really didn't test that bad. They're still fake though.

    • @darrenslab5537
      @darrenslab5537 2 роки тому

      @@1pcfred yes they do make them their part number is EKMH251VQT152MB40T

    • @darrenslab5537
      @darrenslab5537 2 роки тому

      @@SianaGearz nippons of this size often have a cap, the labels actually look correct and the solder blod could easily have gotten there during manufacturing. They measure much as you'd expect an old capacitor that has been stored for a while.
      Occams razor is a useful fence; and in this instance why would anyone go to the effort - the output caps were green sleeved low esr caps, he measured the ESR and presto - low esr, the transformer was a well built unit, there is simply no reason to think the bulk caps are anything but old stock

  • @shagunjaiswal1549
    @shagunjaiswal1549 2 роки тому +1

    Did you have made a power supply from ATX SMPS ? Pls reply I am a subscriber

    • @johncoops6897
      @johncoops6897 2 роки тому +1

      No need for the question. An ATX SMPS is already a Power Supply.

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      @@johncoops6897 This is true. He did review and repair ATX power supplies.
      But he probably meant adjustable power supply.

  • @trians95
    @trians95 2 роки тому +1

    i do agree whats your cat say :)

  • @engineerkohat
    @engineerkohat 2 роки тому +1

    بولنے کا انداز بڑا مزحکہ خیز ہے۔

  • @Pirelli.
    @Pirelli. 2 роки тому

    it's time for a new hairdryer 6:57 😨 🤣🤣🤣 Thanks DGW & god bless you!! 🙏

  • @foto4chrepek315
    @foto4chrepek315 2 роки тому

    1:58 - looks like chipest printer in the world :)

  • @dan2800
    @dan2800 2 роки тому

    To bude flux asi to hnědý všude
    Taky ta frekvence vypadá jako 3x resonance těch 26KHz a 84KHz tak nějak

  • @QuocDat_2410
    @QuocDat_2410 2 роки тому

    lets with schematic

  • @mshafeeqmanzoor9298
    @mshafeeqmanzoor9298 2 роки тому

    Please reverse engineer the chines 1200w boost converter tl494 based.

  • @infotube5423
    @infotube5423 2 роки тому

    10:23 😅😅😅

  • @Nekotine24
    @Nekotine24 2 роки тому

    10:24 name?

  • @PreetPal2107
    @PreetPal2107 2 роки тому +1

    Provide video per week 1 at least

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +1

      I prefer good videos than lazy quick uploaded ones!

  • @Elekron5556
    @Elekron5556 2 роки тому

    Hlavní elektolity na primáru šílené a ještě fake.

  • @tristanhameleers7506
    @tristanhameleers7506 2 роки тому

    I think more problems with your camera that are easily solved are not possible.
    O wel it's allmost all about the content

  •  2 роки тому

    Je srandovní že ten tvůj přízvuk vyhodnotí automatické titulky jako nizozemštinu :D

    • @lukasgayer5393
      @lukasgayer5393 2 роки тому +1

      Já na to koukám hlavně kvůli tomu přízvuku :) Je to můj bobřík odvahy :D

  • @TechnoMasterKyiv
    @TechnoMasterKyiv 2 роки тому +2

    Good video. But capacitors cannot be discharged like that. Try through a 75 watt incandescent lamp

    • @Zebra_Paw
      @Zebra_Paw 2 роки тому +3

      Obviously they can. But when there are discharging resistors they don't even need it most of the time. Also the power supply itself will partly discharge them.