Dell PowerConnect 2716 Switch PSU; low voltage

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  • evilkitty
    Badcaps Veteran
    • Nov 2017
    • 299
    • USA

    #1

    Dell PowerConnect 2716 Switch PSU; low voltage

    I have 2 of these, one working, the other not so much
    I know the large 100uf, 400v cap is good
    i did test the 47uf startup cap, it did barely pass, but maybe i forgot to read the unit on the multimeter
    i assume the capacitance will degrade over time so i probably should replace it, and i assume a EEU-FR1E471Y will be fine, but it is still within spec so the issue should be else where right? I have read this cap is a common cause of failure in these

    my issue is i am getting 0.7v output, before testing those 2 caps i think i was getting 0.5v
    none of the caps are showing any bulging or leaking
    i attached a picture of the power supply i found with a google search

    what part should i check next
    Attached Files
  • sam_sam_sam
    Badcaps Legend
    • Jul 2011
    • 6037
    • USA

    #2
    Re: Dell PowerConnect 2716 Switch PSU; low voltage

    You need to find the switching power supply IC chip on this board it is going to be any where from 4 to 8 terminal to it google the part number it could even be s surface mount IC chip ones you found that chip look for a capacitor near that chip replace it first before you do anything else

    Please post a photo of the bottom of this power supply board
    Thanks

    Some things to check the main board fuse also look for blown apart part or burn up parts and where they are on the board

    If fails to turn on the power supply then I change that chip
    Then if still does not want to work then we go from there

    I hope this helps

    I have had my own nightmare with an Ault 3.0 volt @ 5 amps power supply that was hit with a lighting surge

    Power supply one

    I found one open resistor that had a “0” ohm on surface mount chip also the optic sensor was blown apart and just the pin were there replace that and the power supply would power ON and OFF and just keep doing it

    On power supply two

    It had blown the main fuse on the board and did figure out why
    So I put in a box I will work on it later

    So I decided today to remove the switching IC chip from board # 2 and see what happens on board # 1 ( the optic sensor chip might be toasted on this board as well I am going to order some parts for both of these boards

    Well it did not go well it shot sparks out of the bottom of that chip but it did not blow the fuse on the power supply board that because I use a electronic fast acting fuse controller I built a long time ago it was set to .025 amps

    It has a range of .025 amp to about 6 to 7 amps and very quick to respond to over current

    I have had to repair this electronic fuse controller a few times in the past because things did not go so well on the device that I was working on

    I use it all the time on switching power supply so I know when one dose not work right
    Last edited by sam_sam_sam; 11-25-2017, 03:48 PM.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Dell PowerConnect 2716 Switch PSU; low voltage

      i did test the 47uf startup cap, it did barely pass, but maybe i forgot to read the unit on the multimeter
      i assume the capacitance will degrade over time so i probably should replace it,"
      So you did not test the ESR of the cap? You should replace it anyway, needed or not so you do not have to deal with it in the future.
      The primary section has been cooking for awhile as you can see the board is turning brown from the heat.
      Caps and diodes in the cold side tested fine for sure?
      Last edited by budm; 11-25-2017, 03:42 PM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

      • evilkitty
        Badcaps Veteran
        • Nov 2017
        • 299
        • USA

        #4
        Re: Dell PowerConnect 2716 Switch PSU; low voltage

        Originally posted by budm
        i did test the 47uf startup cap, it did barely pass, but maybe i forgot to read the unit on the multimeter
        i assume the capacitance will degrade over time so i probably should replace it,"
        So you did not test the ESR of the cap? You should replace it anyway, needed or not so you do not have to deal with it in the future.
        The primary section has been cooking for awhile as you can see the board is turning brown from the heat.
        Caps and diodes tested fine for sure?
        I tested the capacitance, it was i think -18% ish, from what i saw all Electrolytic have a 20% tolerance, does that +/-10% or +/- 20%?
        So if i use a working garbage cap i am going to replace from my other board do you think it may get it to put out 5v? obviously not intend to leave it in there, just to see if that cap is the issue
        Last edited by evilkitty; 11-25-2017, 04:01 PM.

        Comment

        • evilkitty
          Badcaps Veteran
          • Nov 2017
          • 299
          • USA

          #5
          Re: Dell PowerConnect 2716 Switch PSU; low voltage

          Well the garbage cap worked, i just stuck it on a 1" lead made from Ethernet wire to the left over solder from removing the failed cap on the bottom of the board
          it lasted over a year and a half doing the same thing, so why not another 15 seconds?
          well it puts out 5v and it is able to power the switch up

          The stock 47uf cap tested at 39.27uf, my scrap one tested at 50uf
          Last edited by evilkitty; 11-25-2017, 04:42 PM.

          Comment

          • Stefan Payne
            Badcaps Legend
            • Dec 2009
            • 1267
            • Germany

            #6
            Re: Dell PowerConnect 2716 Switch PSU; low voltage

            Originally posted by evilkitty
            The stock 47uf cap tested at 39.27uf
            wich still seems fine.
            Especially for high voltage caps the capacitance is on the lower side.
            Even for japanese ones...

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Dell PowerConnect 2716 Switch PSU; low voltage

              Originally posted by evilkitty
              I tested the capacitance, it was i think -18% ish, from what i saw all Electrolytic have a 20% tolerance, does that +/-10% or +/- 20%?
              So if i use a working garbage cap i am going to replace from my other board do you think it may get it to put out 5v? obviously not intend to leave it in there, just to see if that cap is the issue
              When you check the cap, you need to check ESR also not just capacitance. That 47uF more likely to have high ESR.
              Last edited by budm; 11-25-2017, 08:41 PM.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • evilkitty
                Badcaps Veteran
                • Nov 2017
                • 299
                • USA

                #8
                Re: Dell PowerConnect 2716 Switch PSU; low voltage

                How can i test ESR?
                i have 2 multi meters to work with
                craftsman 82008 - http://www.sears.com/craftsman-cm-cr...p-03482008000P
                southwire 21050t - http://www.southwiretools.com/tools/tools/21050T

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Dell PowerConnect 2716 Switch PSU; low voltage

                  You need cap meter that can also test ESR, not the typical meter that you have.
                  Just go to EBAY, for example:
                  https://www.ebay.com/sch/i.html?_fro...meter&_sacat=0
                  You can get meter that can do ESR, CAPACITANCE, and it can also test Transistor and DIODE, ETC.
                  Last edited by budm; 11-25-2017, 09:00 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • evilkitty
                    Badcaps Veteran
                    • Nov 2017
                    • 299
                    • USA

                    #10
                    Re: Dell PowerConnect 2716 Switch PSU; low voltage

                    so are these any good?
                    https://www.ebay.com/itm/122612092649
                    i saw a bunch that look like this some testing parts, looks like you just slap a part in there and press a button and the part is magically detected and you get a schematic and specs on it

                    Comment

                    • Per Hansson
                      Super Moderator
                      • Jul 2005
                      • 5895
                      • Sweden

                      #11
                      Re: Dell PowerConnect 2716 Switch PSU; low voltage

                      Any of the ESR meters in my quote here is good, the one you linked is very old and not really recommended...

                      Originally posted by Per Hansson
                      Yes of course, it was just to show the lowest price possible.
                      If you are really interested in an ESR meter here are a couple nice ones:

                      https://www.ebay.com/itm/GM328-Trans...Y/152443029396

                      https://www.ebay.com/itm/2016-EZM328...a/182344211065

                      https://www.ebay.com/itm/BSIDE-ESR02...r/162714576281
                      I have the same switch, first had to change the startup cap:
                      https://www.badcaps.net/forum/showpo...&postcount=232

                      Then a few years later I had to change them all, so if you need cap details they should be all there
                      https://www.badcaps.net/forum/showthread.php?t=53745
                      "The one who says it cannot be done should never interrupt the one who is doing it."

                      Comment

                      • evilkitty
                        Badcaps Veteran
                        • Nov 2017
                        • 299
                        • USA

                        #12
                        Re: Dell PowerConnect 2716 Switch PSU; low voltage

                        thanks, found a GM328 from a us seller for less
                        https://www.ebay.com/itm/132268934443

                        Comment

                        • evilkitty
                          Badcaps Veteran
                          • Nov 2017
                          • 299
                          • USA

                          #13
                          Re: Dell PowerConnect 2716 Switch PSU; low voltage

                          Tester just arrived
                          This is the not working start up cap
                          35.85uf
                          vLoss 17%
                          ESR 40 Ohm

                          i take it that is pretty bad given a new Nichicon 10uf cap is 10.75uf; 0.8% vloss;1.4Ohm ESR
                          PN: UKL1H100KDDANATD
                          Last edited by evilkitty; 12-02-2017, 03:32 PM.

                          Comment

                          • sam_sam_sam
                            Badcaps Legend
                            • Jul 2011
                            • 6037
                            • USA

                            #14
                            Re: Dell PowerConnect 2716 Switch PSU; low voltage

                            Originally posted by evilkitty
                            Tester just arrived
                            This is the not working start up cap
                            35.85uf
                            vLoss 17%
                            ESR 40 Ohm

                            i take it that is pretty bad given a new Nichicon 10uf cap is 10.75uf; 0.8% vloss;1.4Ohm ESR
                            PN: UKL1H100KDDANATD
                            That ESR reading means that it has gone high which means that it is ( bad )

                            A new one would read about .350 to about 1.something
                            Last edited by sam_sam_sam; 12-02-2017, 03:52 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Dell PowerConnect 2716 Switch PSU; low voltage

                              Originally posted by evilkitty
                              Tester just arrived
                              This is the not working start up cap
                              35.85uf
                              vLoss 17%
                              ESR 40 Ohm

                              i take it that is pretty bad given a new Nichicon 10uf cap is 10.75uf; 0.8% vloss;1.4Ohm ESR
                              PN: UKL1H100KDDANATD
                              As expected.
                              BTW always fully discharge the cap before making the measurement or you will blow up your new meter.
                              Last edited by budm; 12-02-2017, 04:39 PM.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • evilkitty
                                Badcaps Veteran
                                • Nov 2017
                                • 299
                                • USA

                                #16
                                Re: Dell PowerConnect 2716 Switch PSU; low voltage

                                Originally posted by budm
                                As expected.
                                BTW always fully discharge the cap before making the measurement or you will blow up your new meter.
                                Will a cap passively discharge over time and if so how fast (eg sitting in a cardboard box)?

                                I have a shot 470uf cap from here
                                My multimeter shows this cap as 0.11 nf
                                But this new meter shows me this
                                Capacitance: 194.3uf
                                vloss: 12%
                                ESR: 8.1 Ohm

                                on the other my multimeter shows this cap as 0.1 nf
                                But this new meter shows me this
                                Capacitance: 437.9uf
                                vloss: 2.5%
                                ESR: 0.34 Ohm

                                this cap appears to be in better in much shape than the other, but my multimeter does not see the difference in the Capacitance
                                why is this?

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Dell PowerConnect 2716 Switch PSU; low voltage

                                  Originally posted by evilkitty
                                  Will a cap passively discharge over time and if so how fast (eg sitting in a cardboard box)?

                                  I have a shot 470uf cap from here
                                  My multimeter shows this cap as 0.11 nf
                                  But this new meter shows me this
                                  Capacitance: 194.3uf
                                  vloss: 12%
                                  ESR: 8.1 Ohm

                                  on the other my multimeter shows this cap as 0.1 nf
                                  But this new meter shows me this
                                  Capacitance: 437.9uf
                                  vloss: 2.5%
                                  ESR: 0.34 Ohm

                                  this cap appears to be in better in much shape than the other, but my multimeter does not see the difference in the Capacitance
                                  why is this?
                                  Did you remove the cap and test it OFF the board?
                                  And do you have any new 470uF (or any other values) around to test?

                                  It will self discharge due to leakage resistance (very high resistance but it may hold the charge a long time, best to use appropriate Value and Wattage resistor to discharge the cap and then test it with Volt meter.
                                  This is one of many good website for learning:
                                  http://www.electronicdesign.com/anal...e-stuff-anyhow
                                  Last edited by budm; 12-02-2017, 08:34 PM.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • evilkitty
                                    Badcaps Veteran
                                    • Nov 2017
                                    • 299
                                    • USA

                                    #18
                                    Re: Dell PowerConnect 2716 Switch PSU; low voltage

                                    Originally posted by budm
                                    Did you remove the cap and test it OFF the board?
                                    And do you have any new 470uF (or any other values) around to test?
                                    all test were done out of board, board is waiting on good caps to be ordered
                                    the bad 47 uf caps acts as you would expect and so does my 10uf cap

                                    Comment

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