Do no remove this cover under any circumstances

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  • everell
    Badcaps Legend
    • Jan 2009
    • 1514
    • USA

    #1

    Do no remove this cover under any circumstances

    Just couldn't resist....here is a Dynex DX-PS300W.......with cover removed!
    Attached Files
    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)
  • Th3_uN1Qu3
    Believe in
    • Jul 2010
    • 6031
    • Romania

    #2
    Re: Do no remove this cover under any circumstances

    I've seen worse.
    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

    • everell
      Badcaps Legend
      • Jan 2009
      • 1514
      • USA

      #3
      Re: Do no remove this cover under any circumstances

      I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances". LOL! Once inside it is just a cheapo half bridge configuration with KA7500 pwm chip, 2 transistor 5vsb circuit, and primary caps are 330 uF. I doubt that it would stand up to 300 watts.
      Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

      Comment

      • goodpsusearch
        Badcaps Legend
        • Oct 2009
        • 2850
        • Greece

        #4
        Re: Do no remove this cover under any circumstances

        "Fan controlled Power Supply"?

        So, the fan controls the psu?

        Comment

        • Pyr0Beast
          Badcaps Veteran
          • Feb 2009
          • 406

          #5
          Re: Do no remove this cover under any circumstances

          Originally posted by everell
          I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances". LOL! Once inside it is just a cheapo half bridge configuration with KA7500 pwm chip, 2 transistor 5vsb circuit, and primary caps are 330 uF. I doubt that it would stand up to 300 watts.
          It would be good for 150-200W. It seems quite decent psu.

          KA7500 is TL494 under a different name.

          It has good input filtering, lots of heatshrinking, good quality soldering, output filtering and perhaps what I see even 5Vsb made with a linear regulator. It even has a fan connector, very nice. Shielded caps from input transitors/Fets and an input switch. LM339 for Overvoltage protection. Recap and it should run fine.

          I have seen PSU's made far worse. No output chokes, input RFI filters were just wires, underrated resistors.
          Last edited by Pyr0Beast; 12-04-2010, 10:31 AM.

          Comment

          • goodpsusearch
            Badcaps Legend
            • Oct 2009
            • 2850
            • Greece

            #6
            Re: Do no remove this cover under any circumstances

            I hope there is plastic insulation among the pcb back and the metal case...

            It could do 300W if the input caps are replaced with 680uF and the primary transistors are something like 13009 or better.

            I would also check the secondary silicon and recap the output caps with 2x2200uF for every output (3.3V, 5V, 12V) just to be safe

            Comment

            • everell
              Badcaps Legend
              • Jan 2009
              • 1514
              • USA

              #7
              Re: Do no remove this cover under any circumstances

              Originally posted by goodpsusearch
              "Fan controlled Power Supply"?

              So, the fan controls the psu?
              That too is funny. I wonder who thinks up such "technical" information to put on labels.

              Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

              Comment

              • Th3_uN1Qu3
                Believe in
                • Jul 2010
                • 6031
                • Romania

                #8
                Re: Do no remove this cover under any circumstances

                Translations from Chinese to Engrish are always funny.
                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

                • Rulycat
                  Badcaps Veteran
                  • Apr 2010
                  • 724
                  • United Kingdom

                  #9
                  Re: Do no remove this cover under any circumstances

                  What brand are those primary caps? GSC?

                  Comment

                  • Th3_uN1Qu3
                    Believe in
                    • Jul 2010
                    • 6031
                    • Romania

                    #10
                    Re: Do no remove this cover under any circumstances

                    I see HEC.
                    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

                      #11
                      Re: Do no remove this cover under any circumstances

                      KSC. Very low end huntkey. Knowing huntkey its a 200w, 300w peak.

                      Comment

                      • Th3_uN1Qu3
                        Believe in
                        • Jul 2010
                        • 6031
                        • Romania

                        #12
                        Re: Do no remove this cover under any circumstances

                        I wouldn't call anything with a transient filter "very low end". Though agreed, that won't do more than 200-250W.
                        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

                        • c_hegge
                          Badcaps Legend
                          • Sep 2009
                          • 5219
                          • Australia

                          #13
                          Re: Do no remove this cover under any circumstances

                          Looks similar to this.
                          I love putting bad caps and flat batteries in fire and watching them explode!!

                          No wonder it doesn't work! You installed the jumper wires backwards

                          Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                          Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                          Comment

                          • everell
                            Badcaps Legend
                            • Jan 2009
                            • 1514
                            • USA

                            #14
                            Re: Do no remove this cover under any circumstances

                            Yes, the two power supplies do look very much alike. In fact, the part numbers on the three transformers between the heat sinks are identical!

                            The primary caps are HEC 330 uF/200 volts
                            Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                            Comment

                            • Agent24
                              I see dead caps
                              • Oct 2007
                              • 5027
                              • New Zealand

                              #15
                              Re: Do no remove this cover under any circumstances

                              Originally posted by everell
                              I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances".
                              Yeah, do not remove cover lest you notice how crappy the PSU is.
                              "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                              -David VanHorn

                              Comment

                              • Pyr0Beast
                                Badcaps Veteran
                                • Feb 2009
                                • 406

                                #16
                                Re: Do no remove this cover under any circumstances

                                Originally posted by Agent24
                                Yeah, do not remove cover lest you notice how crappy the PSU is.
                                You might get electrocu ... err, shocked !

                                Comment

                                • dood
                                  Deputy dood
                                  • Mar 2004
                                  • 2462
                                  • USA

                                  #17
                                  Re: Do no remove this cover under any circumstances

                                  I have a picture around here somewhere of a crappy PSU that actually had this STAMPED in the metal - "Do not screw off!", with an arrow pointing to a screw.
                                  Ludicrous gibs!

                                  Comment

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