Okia atx-650t v2.0

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  • 370forlife
    Large Marge
    • Aug 2008
    • 3112
    • United States

    #1

    Okia atx-650t v2.0

    Okia. The name doesn't really make any sense to me. Either does Broadway Com Corp, they are neither in broadway, and don't supply products to the communication industry.

    Anyway we all know to stay away from their power supplies, they are just another chinese gutless wonder. What about this one? It was their heavy hitter (until they replaced it with the 680W.) so it should be good quality as every company needs to have one power supply that isn't a total POS (ahem, powmax.)

    First lets start off with an overall shot.



    With this unit, you get what you would expect from a 650W from 2001.

    1x 20+4 pin motherboard connector
    1x 4 pin P4 connector
    1x 8 pin EPS connector
    1x 6 pin PCI-E connector
    1x 6+2 pin PCI-E connector
    7x (!) molex connectors
    2x Floppy connectors
    3x Sata power connectors

    But now lets get to the part we love the most, the internals.



    Uhh, thats a new brand. The UL number leads to You Fu Lin electronics. The fan is pretty cheap, when I first got this unit and fired it up, it spun real slowly, me just thinking the temp control was real aggressive (this unit does indeed have temp control,) then it slowly started spinning up and made a horrible racket. I took the fan out and noticed that the bearings were completely dry, and look like they never had any oil from the factory. A few drops of oil later and it runs just fine. Interesting to note, it is a 135mm fan, quite impressive, but the hub has the motor of a 80mm fan inside of it. Cheap.

    Alright, lets move onto the real internals.



    Geez, this looks really familiar. I don't know why. Anyways it looks favorable for a 400W at the max. Decent sized heatsinks. Big ol' transformer. Full input filter, and a bridge rectifier!

    But why does this layout seem so familiar?



    Ahh, thats why. Its another YueLin unit. I'm use to working with the YLP-013's. This is a YLP-016. There is a few notable differences. I will...uhh...note them as I go.



    Canicon is a recurring theme in this unit, as in everywhere. Every single stinking cap in this thing is a Canicon, and none are visibly failed. The bridge rectifier there is a 6A, 600V KBU package, good for up to 100C.



    The primary switchers on this unit are two D4515 by Jilin-Sino in a TO-3P package. Rated at 400V and 15A continuous. They are used in a half-bridge configuration. The larger 5vsb transformer is closer to the primary switchers than on the YLP-013. It still utilizes a two transistor 5vsb circuit.



    There was too much in the way to get a good shot of the secondary rectifiers, but I was able to eyeball their part numbers using a flashlight and lots of squinting. The 5v is supplied by a 60A, 45V schottky rectifier in a TO-247 package by Mospec. The 12v is supplied by two 16A, 200V ultra-fasts both in TO-220 package, again by Mospec. The 3.3v is supplied by a 40A, 45V schottky in TO-247 package, once again, by Mospec. All three rails are silkscreened for up to two TO-247 devices, where as the YLP-013 was only silkscreened for two on the 5v.

    Funny, I have a Wintech WIN-400PS with the exact same capacity for it's secondary, and as it's name implies it is a 400W.



    The secondary toroid coils are quite sizable.



    The PWM controller/protections IC is a standard EST7502B found on the YLP-013, and the 013 is silkscreened for this little controller but is missing it. The little chip here is a Weltrend WT75180. I can't find a data sheet for it. I'd like to know what it does. I thought it was for 5v and 12v correction, as there is a 5v sense return and a 12v sense return silkscreened on both the 013 and 016, but they are not used on both. I'm thinking maybe it's for OPP?
    Attached Files
  • Th3_uN1Qu3
    Believe in
    • Jul 2010
    • 6031
    • Romania

    #2
    Re: Okia atx-650t v2.0

    The Weltrend chip is most likely monitoring the rails and doing OVP/UVP. Not likely for this to have OPP. Even if it does, it'll probably blow up before the OPP point is reached.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

    Comment

    • 370forlife
      Large Marge
      • Aug 2008
      • 3112
      • United States

      #3
      Re: Okia atx-650t v2.0

      The EST7502B takes care of OVP/UVP.

      Comment

      • Th3_uN1Qu3
        Believe in
        • Jul 2010
        • 6031
        • Romania

        #4
        Re: Okia atx-650t v2.0

        My bad, just read its datasheet now. I don't think you're gonna find out what it does unless you trace the circuit and do some measurements.
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

        Comment

        • Toasty
          Badcaps Legend
          • Jul 2007
          • 4171

          #5
          Re: Okia atx-650t v2.0

          >>The little chip here is a Weltrend WT75180. I can't find a data sheet for it.<<

          Perhaps WT7518D ??

          .
          Attached Files
          veritas odium parit

          Comment

          • b700029
            Banned
            • Sep 2010
            • 640

            #6
            Re: Okia atx-650t v2.0

            Would the input rectifier be the weakest part in this PSU? From the ratings on the other parts it looks like it could do 650W.

            Comment

            • 370forlife
              Large Marge
              • Aug 2008
              • 3112
              • United States

              #7
              Re: Okia atx-650t v2.0

              Originally posted by Toasty
              >>The little chip here is a Weltrend WT75180. I can't find a data sheet for it.<<

              Perhaps WT7518D ??

              .
              Ah hah! Yes, it is, yes it is. It says it does OCP in the data sheet, but I can't find any shunts on the secondary so I must assume it does OPP then.

              Comment

              • 370forlife
                Large Marge
                • Aug 2008
                • 3112
                • United States

                #8
                Re: Okia atx-650t v2.0

                Originally posted by 370forlife
                The primary switchers on this unit are two D4515 by Jilin-Sino in a TO-3P package. Rated at 400V and 15A continuous. They are used in a half-bridge configuration. The larger 5vsb transformer is closer to the primary switchers than on the YLP-013. It still utilizes a two transistor 5vsb circuit.
                Oops, found a mistake. That's suppose to be transistor.

                Comment

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