HEC-250LR-T ATX Computer psu

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  • joshnz
    Badcaps Veteran
    • Feb 2011
    • 969
    • New Zealand

    #1

    HEC-250LR-T ATX Computer psu

    Hello my power supply for my old pc went pop during a power dip when ups kicked in.

    Found the 5vstb controller a TOP222Y has failed 42ohms drain to source,
    and a resistor that I can't identify it's color code is "yellow violet gold gold" that is what made the pop sound.
    My pc
    CPU : AMD PHENOM II x4 @ 3.5Ghz
    MB : ASUS M4A89TD PRO USB3
    RAM : Kingston ValueRAM 16gb DDR3
    PSU : Cooler Master 850W Silent Pro
    GPU : ATI Radeon HD 6850
  • Pentium4
    CapXon Be Gone
    • Sep 2011
    • 3741
    • USA

    #2
    Re: HEC-250LR-T ATX Computer psu

    Guessing no MOV's in there? Pictures?

    Comment

    • joshnz
      Badcaps Veteran
      • Feb 2011
      • 969
      • New Zealand

      #3
      Re: HEC-250LR-T ATX Computer psu

      Not much too see does have mov's
      Attached Files
      My pc
      CPU : AMD PHENOM II x4 @ 3.5Ghz
      MB : ASUS M4A89TD PRO USB3
      RAM : Kingston ValueRAM 16gb DDR3
      PSU : Cooler Master 850W Silent Pro
      GPU : ATI Radeon HD 6850

      Comment

      • Escort Eagle
        Senior Member
        • Jul 2012
        • 110
        • USA

        #4
        Re: HEC-250LR-T ATX Computer psu

        I think the resistor value should be 47K, but I am not sure . Can you draw a schematic for 5VSB Primary Section only . And have you any datasheet of TOP222Y Mosfet ?

        Comment

        • TELVM
          Badcaps Veteran
          • Oct 2012
          • 547
          • Spain

          #5
          Re: HEC-250LR-T ATX Computer psu

          There are two MOVs between the primary caps:

          Attached Files
          Last edited by TELVM; 12-19-2013, 07:04 AM.

          Comment

          • joshnz
            Badcaps Veteran
            • Feb 2011
            • 969
            • New Zealand

            #6
            Re: HEC-250LR-T ATX Computer psu

            Here is circuit same as in data sheet.
            Attached Files
            My pc
            CPU : AMD PHENOM II x4 @ 3.5Ghz
            MB : ASUS M4A89TD PRO USB3
            RAM : Kingston ValueRAM 16gb DDR3
            PSU : Cooler Master 850W Silent Pro
            GPU : ATI Radeon HD 6850

            Comment

            • joshnz
              Badcaps Veteran
              • Feb 2011
              • 969
              • New Zealand

              #7
              Re: HEC-250LR-T ATX Computer psu

              All i need to know is resistor value to replace and replace TOP222Y.
              And hope no high voltage pulse went out the secondary.
              My pc
              CPU : AMD PHENOM II x4 @ 3.5Ghz
              MB : ASUS M4A89TD PRO USB3
              RAM : Kingston ValueRAM 16gb DDR3
              PSU : Cooler Master 850W Silent Pro
              GPU : ATI Radeon HD 6850

              Comment

              • Escort Eagle
                Senior Member
                • Jul 2012
                • 110
                • USA

                #8
                Re: HEC-250LR-T ATX Computer psu

                Then It should be a fusing Resistor of 4.7Ω/1W . Use a 100W series bulb tester at test condition for avoiding damage .

                Comment

                • joshnz
                  Badcaps Veteran
                  • Feb 2011
                  • 969
                  • New Zealand

                  #9
                  Re: HEC-250LR-T ATX Computer psu

                  It is a 1/4watt or less I know that much by its size.
                  It will be a over a month for replacement top222y to arrive.
                  Last edited by joshnz; 12-19-2013, 11:35 AM.
                  My pc
                  CPU : AMD PHENOM II x4 @ 3.5Ghz
                  MB : ASUS M4A89TD PRO USB3
                  RAM : Kingston ValueRAM 16gb DDR3
                  PSU : Cooler Master 850W Silent Pro
                  GPU : ATI Radeon HD 6850

                  Comment

                  • Pentium4
                    CapXon Be Gone
                    • Sep 2011
                    • 3741
                    • USA

                    #10
                    Re: HEC-250LR-T ATX Computer psu

                    Since this thing is pushing 14 years old and you've already got it torn apart, you should replace the lytics. Looks really well built for its age and wattage.

                    Comment

                    • joshnz
                      Badcaps Veteran
                      • Feb 2011
                      • 969
                      • New Zealand

                      #11
                      Re: HEC-250LR-T ATX Computer psu

                      Originally posted by Pentium4
                      Since this thing is pushing 14 years old and you've already got it torn apart, you should replace the lytics. Looks really well built for its age and wattage.
                      Will do.
                      It's full of CapXon.
                      My pc
                      CPU : AMD PHENOM II x4 @ 3.5Ghz
                      MB : ASUS M4A89TD PRO USB3
                      RAM : Kingston ValueRAM 16gb DDR3
                      PSU : Cooler Master 850W Silent Pro
                      GPU : ATI Radeon HD 6850

                      Comment

                      • Pentium4
                        CapXon Be Gone
                        • Sep 2011
                        • 3741
                        • USA

                        #12
                        Re: HEC-250LR-T ATX Computer psu

                        Wow those are all CapXon? They held up pretty well! I wonder if they're still in spec.

                        Comment

                        • joshnz
                          Badcaps Veteran
                          • Feb 2011
                          • 969
                          • New Zealand

                          #13
                          Re: HEC-250LR-T ATX Computer psu

                          I don't have a esr meter or a captance meter that goes over 200uf so won't know
                          My pc
                          CPU : AMD PHENOM II x4 @ 3.5Ghz
                          MB : ASUS M4A89TD PRO USB3
                          RAM : Kingston ValueRAM 16gb DDR3
                          PSU : Cooler Master 850W Silent Pro
                          GPU : ATI Radeon HD 6850

                          Comment

                          • everell
                            Badcaps Legend
                            • Jan 2009
                            • 1514
                            • USA

                            #14
                            Re: HEC-250LR-T ATX Computer psu

                            Originally posted by Escort Eagle
                            Then It should be a fusing Resistor of 4.7Ω/1W . Use a 100W series bulb tester at test condition for avoiding damage .
                            I would argue that the resistor value should be 0.47 ohm.
                            Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                            Comment

                            • joshnz
                              Badcaps Veteran
                              • Feb 2011
                              • 969
                              • New Zealand

                              #15
                              Re: HEC-250LR-T ATX Computer psu

                              Originally posted by everell
                              I would argue that the resistor value should be 0.47 ohm.
                              That is what I was thinking due to it been smaller than a 1/4 resister.
                              My pc
                              CPU : AMD PHENOM II x4 @ 3.5Ghz
                              MB : ASUS M4A89TD PRO USB3
                              RAM : Kingston ValueRAM 16gb DDR3
                              PSU : Cooler Master 850W Silent Pro
                              GPU : ATI Radeon HD 6850

                              Comment

                              • kc8adu
                                Super Moderator
                                • Nov 2003
                                • 8832
                                • U.S.A!

                                #16
                                Re: HEC-250LR-T ATX Computer psu

                                that 3rd band could be silver...
                                it looks different than the 4th.
                                which is gold.
                                Originally posted by everell
                                I would argue that the resistor value should be 0.47 ohm.

                                Comment

                                • Agent24
                                  I see dead caps
                                  • Oct 2007
                                  • 4951
                                  • New Zealand

                                  #17
                                  Re: HEC-250LR-T ATX Computer psu

                                  I have one of these HEC-250LR-T v1.1 sitting here, also dead. As long as the same resistor isn't blown I can tell you what yours is supposed to be, tomorrow.

                                  What's the refdes of your dead resistor?
                                  "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                  -David VanHorn

                                  Comment

                                  • Agent24
                                    I see dead caps
                                    • Oct 2007
                                    • 4951
                                    • New Zealand

                                    #18
                                    Re: HEC-250LR-T ATX Computer psu

                                    Well, that's interesting. R011 is OC on mine too. But I can confirm it's Yellow-Violet-Gold-Gold, so assuming they used a normal code then it's 4.7 Ohms, 5%.

                                    My TOP222Y though measures 30 Megohm G-S (both directions)

                                    Also there is a missing component near the comparator, looks like R41. Is that same component missing on yours? (see approximate center of photo)

                                    A first I thought it might have vaporised since there are leads but no body, but there are no burn marks or carbon so maybe that's not the case. Very strange.
                                    Attached Files
                                    "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                    -David VanHorn

                                    Comment

                                    • joshnz
                                      Badcaps Veteran
                                      • Feb 2011
                                      • 969
                                      • New Zealand

                                      #19
                                      Re: HEC-250LR-T ATX Computer psu

                                      Ok agent I seen your thread on this psu I'll have a look at mine when I get home.

                                      They top222y is not a mosfet it is a ic with a mosfet built in.

                                      It has pins
                                      Drain negative of transformer
                                      Source DC -
                                      Control VCC and Feedback

                                      What is the reading between Drain and Source.
                                      My pc
                                      CPU : AMD PHENOM II x4 @ 3.5Ghz
                                      MB : ASUS M4A89TD PRO USB3
                                      RAM : Kingston ValueRAM 16gb DDR3
                                      PSU : Cooler Master 850W Silent Pro
                                      GPU : ATI Radeon HD 6850

                                      Comment

                                      • Agent24
                                        I see dead caps
                                        • Oct 2007
                                        • 4951
                                        • New Zealand

                                        #20
                                        Re: HEC-250LR-T ATX Computer psu

                                        Sorry, where I said "gate to source" should have been "drain to source"

                                        Or in other words, the two right-most legs on the package when viewed from the front.
                                        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                        -David VanHorn

                                        Comment

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