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Dell GX280 \ LiteOn PS-5161-7DS question

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    #21
    Re: Dell GX280 \ LiteOn PS-5161-7DS question

    Start up caps are also part of the cap kit that should be replace at the same time.
    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


      #22
      Re: Dell GX280 \ LiteOn PS-5161-7DS question

      Originally posted by momaka View Post
      Wow, that 10uF cap has nearly 40 Ohms ESR!

      The again, these PSUs probably run quite hot. No surprise if even Japanese caps get cooked in there (granted, it will probably take them much longer).
      Oh, it gets hot alright... The fan speed is also stupidly low. These PCs look like they were designed for a certain size and noise level, with total disregard for _anything_ else. If I keep it I might mod the PSU fan to run at full speed.

      Originally posted by momaka View Post
      I guess the small caps even in these regular PC PSUs should never be underestimated. Learning something new everyday. Good job on the repair, by the way .
      I found the clue here: http://www.repairfaq.org/sam/smpsfaq.htm#smpsuc3842d Problem is, it's buried down the bottom of the page - they should have included it as part of the 'power cycling troubleshooting' section at the top!

      Originally posted by budm View Post
      Start up caps are also part of the cap kit that should be replace at the same time.
      I didn't think of it before because the symptoms were rather odd.

      It *did* start when connected to the PC, then it would run for a bit, then it would start power cycling.

      With a dead startup cap I expected it would never start at all, and if it was some big problem I would expect it to power cycle straight away.

      That's why I thought (maybe badly) it might be something in the monitoring circuitry.
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

      Comment


        #23
        Re: Dell GX280 \ LiteOn PS-5161-7DS question

        Put that cap on ESR meter while heating up with hair dryer to see if the ESR will drop if the cap is not too far gone, I use hair dryer alot to locate bad caps problem.
        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


          #24
          Re: Dell GX280 \ LiteOn PS-5161-7DS question

          Originally posted by budm View Post
          Put that cap on ESR meter while heating up with hair dryer to see if the ESR will drop if the cap is not too far gone, I use hair dryer alot to locate bad caps problem.
          Yeah, it did. I also made a video for fun: https://www.youtube.com/watch?v=yFUu3fopfls
          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
          -David VanHorn

          Comment


            #25
            Re: Dell GX280 \ LiteOn PS-5161-7DS question

            wow nice video, probably explains why my old macintosh lc power supply fires up if i put a box heater in front of it.
            My Computer: AMD Ryzen 9 3900X, Asrock X370 Killer SLI/AC, 32GB G.SKILL TRIDENT Z RGB DDR4 3200, 500GB WD Black NVME and 2TB Toshiba HD,Geforce RTX 3080 FOUNDERS Edition, In-Win 303 White, EVGA SuperNova 750 G3, Windows 10 Pro

            Comment


              #26
              Re: Dell GX280 \ LiteOn PS-5161-7DS question

              Originally posted by Agent24 View Post
              Yeah, it did. I also made a video for fun: https://www.youtube.com/watch?v=yFUu3fopfls
              Nice video! This should be made into a sticky. Pretty cool.

              Comment


                #27
                Re: Dell GX280 \ LiteOn PS-5161-7DS question

                Glad you like it. I would have liked to make a better one but my camera is too old (limits to 30 seconds), plus I think a thermocouple could have been useful.
                "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                -David VanHorn

                Comment


                  #28
                  Re: Dell GX280 \ LiteOn PS-5161-7DS question

                  Thank you all for your information.
                  I manage to repair my psu with your help.
                  I wanted to add that in secondary section of my psu there were many cracked joins.

                  Comment


                    #29
                    Re: Dell GX280 \ LiteOn PS-5161-7DS question

                    Originally posted by Agent24 View Post
                    Thanks, might have a look, at least it may clear up how the PWR_OK signal is supposed to work on this PSU...
                    One thing I can tell you is that HP switching power supply can not be run very long with out a motherboard because the power supply will lock up in this mode of operation
                    9 PC LCD Monitor
                    6 LCD Flat Screen TV
                    30 Desk Top Switching Power Supply
                    10 Battery Charger Switching Power Supply for Power Tool
                    6 18v Lithium Battery Power Boards for Tool Battery Packs
                    1 XBox 360 Switching Power Supply and M Board
                    25 Servo Drives 220/460 3 Phase
                    6 De-soldering Station Switching Power Supply 1 Power Supply
                    1 Dell Mother Board
                    15 Computer Power Supply
                    1 HP Printer Supply & Control Board * lighting finished it *


                    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                    2 Hem Saw Computer Stack Board

                    All of these had CAPs POOF
                    All of the mosfet that are taken out by bad caps

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