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the gutless, bloated, and fried power supply hall of shame

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    Re: the gutless, bloated, and fried power supply hall of shame

    Originally posted by coreAngel View Post
    so any advice
    It's got full input filtering and an 8 A bridge rectifier, so they *likely* didn't skimp on the secondary too much either.

    The two "p4nk607fp" are likely STP4NK60ZFP MOSFETs (one for APFC and one for main switch?)

    "IC36AK" is probably an ICE3A -series off-line SMPS current mode PWM-FET. Depending on which model it is, it can be either for the 5 VSB or for the main supply (these chips can supposedly deliver up to 240 Watts ).

    "STPS2045CT" is exactly that - a 20 A, 45 V schottky rectifier. Could be on either 3.3V, 5V, or 12V rails.

    "CSC2486" might be a 2SC2486 MOSFET. But with only 12 A peak current and 120 V_ceo ratings, I'm not sure what the purpose of this would be in a PSU.

    The 20 AWG wires shouldn't be too much of a problem if they are short and since this is only a 200 Watt unit. The Delta Electronics PSU that came with my Gateway GT5656 PC is rated for 300 Watts and still uses nothing but 20 AWG wires.

    So all in all, I think it is an okay PSU for its rating.

    Comment


      Re: the gutless, bloated, and fried power supply hall of shame

      It was suggested i add this crap of a PSU here i posted somewhere else here goes:

      Hello everyone, boy do i have a treat for you guys and gals too today. I went to the computer store liquidation sale and managed to snag a Diablotek PSU that was sitting in their storeroom for almost 4 years. I snagged it for 2 dollars.I won't pay more for this kind of crap.

      It's a Diablotek 350 watt psu with 2 fans and it reminded me of a same brand psu i had in the past (more on that later) it says in the box 350 watts

      NOOOO Input Filters at all( so that was that hum around my house was when i plugged it in)
      4 Diode Treatment
      LCZ main craps
      BH craps the rest
      Bao DI Crap Fan

      It has all ST and Fairchild chips ( i can't believe these brands are in there)

      Now about why this reminded me about a previous PSU, i used to frequent this store back in 2001 when i had my first pc an Emachines etower 667ir ,I wanted to upgrade memory ,cd drives etc, and i decided i needed a better power supply (2003) yeah boy was i a noob , i purchased a diablotek 350 watt micro atx psu since it was so small, i thought this was great ( i wish i had joined this site long ago) maybe it's better quality? i only used the power supply for a total of three months then decided to build a new pc.

      I tossed the PC in the closet and forgot about it, more than a year ago doing cleanup i decided to take a look at that PSU it had the same layout but had G luxon all caps and none were bulged, it had a sort of full input filtering minus a x cap and looked beefy enough to me at the time maybe i was wrong what really caught my eye was at the corner of the PSU board it said : "ENGSMPL" and thought of nothing else at the time so i guessed it wasn't a final version? how did it end up in my hands? but i didn't need the computer as its motherboard went bad. and turned it over to a recycler , which i wish i never did, so diablotek maybe good in the past , wtf now....

      sorry for such a long post
      Attached Files
      Yes i love Nichicon MUSE Audio Capacitors...they would look awesome all over any motherboard

      Comment


        Re: the gutless, bloated, and fried power supply hall of shame

        I think I have a candidate for the worst power supply (relative to "rated" wattage). Ok, maybe not as bad as an A-Power or Echo Star (or powmax), but it's pretty crap in every aspect.

        We have a dead Okia 550W unit, seems to be a 5VSB issue.

        First, the sticker and external overview:







        Look at that thin wire... it feels as cheap as it looks.

        Found some casing damage, which looks factory (the warranty sticker was intact):



        That is thin metal indeed. The 12V connectors are fouled up too:



        They gave a 4 pin and a split 4/8pin? Why??? ... I guess they gave a second plug in case the thin wire fries on the first... but wait, it's a 5V heavy old design! Now I'm really confused...

        Cover off, here's what is seen:



        Looks pretty crap from here. This is a destructive teardown, as this junker is too light to be used as a door stop . A 250W hipro was much, much heavier.

        Anyway, a look at the primary, those with weak stomachs need to look away now



        First, nothing is soldered straight. Tilted left, tilted right, it resembles a novice solderer's first project, not a production product. Also, the primary is very stripped out; the two choke locations are jumpered away, the X caps are gone, and the Y caps are swapped for cheesy looking ceramics. Oh, and the primary caps are an accident waiting to happen. Looking at this alternate angle...



        ... one can see why the one cap was butting the heatsink (Short hazard?). These are not the usual rivited tab primary caps quality units use, these are leaded wannabes that one of which wasn't trimmed. The assembler must have left it 1/2" off the board, realized it wouldn't fit, and twisted it down rather than re-heat the joints and push the cap the rest of the way down. Then again, they cut corners everywhere else; it already was a circle.

        Speaking of tilted components... look at this shot of the gutless primary:



        Even the jumper links on the choke silkscreens are tilted! This even makes powmax look good!

        Before I jump to the silicon and the secondary, here's the fan that was installed:



        No brand, just bling. I assume those are blue LEDs. Felt like a not-yet-seized sleeve bearing. :trashacan:

        Here's the wimpy silicon, to match the scrawny thin heatsinks:



        The secondary has a surprise...



        ... PI coils! After all the junk they cheaped out on, they actually put in coils. The caps are still tiny, though.

        Here's the fried 5VSB:



        Looks like a 2 transistor job, complete with failed cap. Didn't kill any motherboards, though. Wouldn't spin up, though. 5VSB was completely dead.

        Not that the other joints were that good to begin with.


        What a turd. 550W my ass. Not even 200 probably. The only quality parts were of all things PI coils... otherwise, it was as gutless as gutless could ever be.
        Attached Files
        sigpic

        (Insert witty quote here)

        Comment


          Re: the gutless, bloated, and fried power supply hall of shame

          Yeah…they made such units with 13009 and 135mm fan under different brands, those could most likely do about 400-450 W, but this is about 300-350 and who knows how little in spec…
          Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

          Exclusive caps, meters and more!
          Hardware Insights - power supply reviews and more!

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            Re: the gutless, bloated, and fried power supply hall of shame

            Originally posted by ratdude747 View Post
            What a turd. 550W my ass. Not even 200 probably. The only quality parts were of all things PI coils... otherwise, it was as gutless as gutless could ever be.
            The sad thing is that system integrators want this overlabeled bullshit...
            That's what I heard from the industry...

            Comment


              Re: the gutless, bloated, and fried power supply hall of shame

              Heh, it's not the worst though. The worst ones use 1A or 2A diodes for the mains rectification, and the "two diode treatment" on the secondary for the 12V XD

              But yeah, the build quality is really poor!

              You could give it a 5vsb mod and some better caps, and it might be a halfway decent supply. Not 550W, maybe like 300 or 350W max? The transformer is a bit small for 550W, but then again, it depends on the circuit design as well.
              (Smaller transformers for higher frequency?)

              -Ben
              Muh-soggy-knee

              Comment


                Re: the gutless, bloated, and fried power supply hall of shame

                250watt max

                Comment


                  Re: the gutless, bloated, and fried power supply hall of shame

                  @ratdude747 ... off topic but still.. I wish you'd stop inlining so many pictures at such high resolution and size... they're about 1 MB each and it takes more than 10 minutes for this site to load them...
                  It's not my connection (I have 500/25), it's just the server being crappy.

                  Use something like Irfanview, go in Batch conversion/resize and resize all pictures to 1024x ** and use jpg 80% quality, you'll get each picture under 300-350 KB without noticeable loss in quality.
                  You can always zip all pictures at high res and link to them at the bottom.

                  Comment


                    Re: the gutless, bloated, and fried power supply hall of shame

                    I thought I had my camera set to 2mb mode... Whoops. Too late to fix it w/o mod powers. Yeah, the pics are a bit large.

                    As for the unit, its been scrapped. I don't have time to deal with this junk...
                    sigpic

                    (Insert witty quote here)

                    Comment


                      Re: the gutless, bloated, and fried power supply hall of shame

                      Originally posted by ratdude747 View Post
                      Look at that thin wire... it feels as cheap as it looks.
                      20 AWG, I am guessing. Yeah, pretty dissapointing to see that. But then again, the 300 Watt Delta DPS-300AB-15B that came with my Gateway GT5656 also uses 20 AWG wire on all connectors. I'm not happy about it, but I guess it works?

                      Originally posted by ratdude747 View Post
                      That is thin metal indeed. The 12V connectors are fouled up too:
                      ...
                      They gave a 4 pin and a split 4/8pin? Why??? ... I guess they gave a second plug in case the thin wire fries on the first...
                      Maybe one of them is intended as an 8-pin PCI-E power connector for a graphics card?

                      Originally posted by ratdude747 View Post
                      This is a destructive teardown, as this junker is too light to be used as a door stop .
                      Well, I hope you still save it for parts, though.

                      Originally posted by ratdude747 View Post
                      Oh, and the primary caps are an accident waiting to happen. Looking at this alternate angle...
                      ... one can see why the one cap was butting the heatsink (Short hazard?).
                      Yup, that could be a short-circuit hazard indeed. It really depends, though, if the heatsink is tied to negative or positive side on the voltage doubler and if the capacitor can is internally connected to negative or positive leg (and also if the cap has a plastic sleeve on top).
                      I just got shocked the other day while charging a small 22 uF 250 V cap by accidentally touching the positive lead and exposed aluminum on the capacitor can at the same time. Fun times!

                      Originally posted by ratdude747 View Post
                      Even the jumper links on the choke silkscreens are tilted! This even makes powmax look good!
                      Reminds me of my Raidmax RX-380K (Sun Pro KY-480ATX), also posted here. It was the same thing with that one. At least you get a large 120 mm LED fan.

                      Speaking of which...
                      Originally posted by ratdude747 View Post
                      Before I jump to the silicon and the secondary, here's the fan that was installed:
                      ...
                      No brand, just bling. I assume those are blue LEDs. Felt like a not-yet-seized sleeve bearing. :trashacan:
                      No, don't trash it!
                      Even cheap fans can last a very long time if the sleeve bearings are properly cleaned and lubricated. I have a few cheap fans that I fixed a while back, and they actually managed to last longer than a Delta ball bearing fan I fixed around the same time.

                      Originally posted by ratdude747 View Post
                      Then again, they cut corners everywhere else; it already was a circle.

                      That comment made my day!

                      Originally posted by ben7 View Post
                      But yeah, the build quality is really poor!
                      I agree.
                      I think the parts used in this PSU are not that bad, but the way the PSU was assembled is just terrible. Maybe whoever was in control of the conveyor speed for the assembly line accidentally bumped the knob to "high speed" and then the workers tried to compensate by installing everything quickly?

                      Originally posted by ben7 View Post
                      The transformer is a bit small for 550W, but then again, it depends on the circuit design as well.
                      (Smaller transformers for higher frequency?)
                      Higher frequency??? With a cheap half-bridge design from three decades ago based on the KA7500/TL494 PWM ICs???
                      - No way, Jose. Not a chance!

                      You can bet the transformer uses only a few tricker strands of wire inside vs. more strands of finer wire. So I'd say you are looking at 250 Watts max, 300 Watts peak. And that'd be "raw" power, unless the input and output caps are sized properly too.
                      Last edited by momaka; 12-27-2015, 10:04 PM.

                      Comment


                        Re: the gutless, bloated, and fried power supply hall of shame

                        No, don't trash it!
                        Even cheap fans can last a very long time if the sleeve bearings are properly cleaned and lubricated. I have a few cheap fans that I fixed a while back, and they actually managed to last longer than a Delta ball bearing fan I fixed around the same time.
                        What was wrong with the double ball bearing Delta fan? Were the ball races worn? Did it need to be greased? And I noticed ratdude's gutless unit employs the dreaded conductive glue which is already blackening from the heat. I really hate that stuff.

                        Comment


                          Re: the gutless, bloated, and fried power supply hall of shame

                          Originally posted by momaka View Post
                          Higher frequency??? With a cheap half-bridge design from three decades ago based on the KA7500/TL494 PWM ICs???
                          - No way, Jose. Not a chance!
                          Are you sure that pwm chip is KA7500/TL494? Looks to me more like a EST7502. Perhaps I am wrong......maybe Ratdude will take a look and tell us what that pwm chip is. Also I am curious as to what switching transistors it is using.

                          Looks to me to be about the same as the IMicro/Coolmax/Logisys power supplies claiming to be 400 whats!

                          The load resistors for the pwm chip outputs look burnt. Wouldn't surprise me if the switching transistors were shorted, the driver transistors shorted, and the pwm chip smoked.

                          I have a OKIA 500 watt power supply which makes this one look like a jewel. Three quarter sized pc board, smaller case, and stuck fan don't help put the power out either.
                          Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                          Comment


                            Re: the gutless, bloated, and fried power supply hall of shame

                            Originally posted by Wester547 View Post
                            What was wrong with the double ball bearing Delta fan?
                            Bearings are getting old and loose. Need to be oiled (again). They are sealed, so I can't grease them. Once they warm up, the fan gets very noisy and barely runs.

                            Originally posted by everell
                            Are you sure that pwm chip is KA7500/TL494?
                            No.
                            I just said that because most secondary-side PC PSU controllers that are used for half-bridges (like SG6105, AT2005B, and ATX2005) are pretty much just a variation of the KA7500/TL494. They may have more/extra functions, but their Oscillator running frequency is usually about the same (typically in the range of 50-70 KHz, which in H-bridge topology translates to 25-35 KHz square waves at the output).

                            Comment


                              Re: the gutless, bloated, and fried power supply hall of shame

                              Originally posted by momaka View Post
                              It may only be a 200 Watt power supply, but if it really can do 14 Amps on the 12 V rail, that is plenty for something like a Core 2 Duo, low-end C2Q
                              A Core 2 Quad, OTOH, exponentially goes up in watts when OC'ed, 250 W easily for the processor alone at 3.3!

                              Easily like an OC'ed FX, if not more! In fact, I wouldn't be surprised if a 65 nm Quad makes my FX look like a green freak! LOL!

                              The OC expert folks say 250 W+ easily for CPU alone with 1.4 V Vcore at only 3.3. So, that would easily mean at least a 350 W PSU, if not a 400 W PSU. (And that's with a video card that don't use a power plug, such as a GeForce GT 640 and GeForce GTX 750)
                              Last edited by RJARRRPCGP; 12-31-2015, 04:35 PM.
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                                Re: the gutless, bloated, and fried power supply hall of shame

                                Eh, 250 W? ROFLMAO. Maybe 150 W max under water. With VRM waste power say 170 W. Even Bulldozer is difficult to cool down over 150 W. The C2Q core is small, not to mention at 150+ A the traces themselves would melt.

                                You don't have to believe every PoS you hear from amateurs who do not even know what wattmeter is, let alone current meter or voltmeter.
                                Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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