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PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

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    PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

    My PSU has strange sound and PG= 0 ms

    If you've ever encountered such a case, please show me.
    Any help would be appreciated.









    Attached Files
    Last edited by Per Hansson; 02-26-2020, 02:13 PM. Reason: Offsite images uploaded

    #2
    Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

    Could we see some pictures?
    If it's built by Deer/Allied or some similar OEM, I'd suspect bad caps near the secondary-side controller/supervisor IC that generates the PG signal.

    Comment


      #3
      Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

      That looks like the Solytech one...

      Comment


        #4
        Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

        ^ Yup, it's a Solytech.
        If we can get the part number on the secondary-side IC/controller, that should help trace the PG signal.
        Again, this being a Solytech, I'd suspect some of those small caps near the secondary-side controller (but probably a good idea to recap the whole PSU anyways.)

        Comment


          #5
          Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

          OSC IC : UC 3844BN
          OUTPUT: UF460L
          The secondary-side IC/controller : GR8323N
          Attached Files

          Comment


            #6
            Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

            Looks like PG signal is handled completely by the GR8323N controller IC.

            According to its datasheet, pin 1 (PGI) should be connected to two resistors and one cap (looking at your PSU pics, there may be 2 caps in parallel there, though.) Pull these components out and test them make sure they are good.

            Next, pin 16 (PGO) is the output that directly connects to the gray PG wire on the PSU. According to the datasheet, there should only be a pull-up resistor and a cap to ground on this pin. Find these components on your PSU, remove them, and make sure they test good.

            Post what you find when you do these two tests.

            Comment


              #7
              Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

              PIN 1 is connected to 20K Ohm and 2.2K Ohm resistors, 2 caps 104.
              I remove them and then replace with the new ones.

              PIN 16 is connected to 1K Ohm resistor and cap 104.
              I also replace with the new ones.

              My PSU still has the sound "c..c..c..." and PG =0.

              Comment


                #8
                Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

                https://html.alldatasheet.com/html-p...9/GR8323N.html

                Look at page 8 at the bottom half of the page

                Here is how I would go about troubleshooting this problem

                ( Have you recap this switching power supply especially any capacitor that has a UF value below 100uf )

                The current sensor resistors —> I would put a volt meter across the current sensor resistor 3 volt, 5 volt and across the 12 volt and see what voltage you have across each one ( this assuming that you do not have very much of a load on any rail ) and see if one of those rail has more voltage than any other one if so which rail and why or you might have a faulty ic chip

                Because from what I read about this chip and if I am understanding correctly it says that if the current is over 20 amps then the chip controller would turn off PG pin and be in a fault condition
                Last edited by sam_sam_sam; 03-11-2020, 07:14 PM.
                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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