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    Macron MPT-301 won't start

    I hear a brief tick from the Primary area when I try starting it, either connected up to motherboard, HDD, ODD etc., or stand-alone connected only to HDD and jumpering PSON

    AFAIK everything's original

    Help with hand-holding please
    Attached Files
    better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

    #2
    Re: Macron MPT-301 won't start

    sounds like it might have a shorted rectifier on the secondary bside
    Last edited by c_hegge; 09-17-2014, 08:55 PM.
    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


      #3
      Re: Macron MPT-301 won't start

      Check solder joints too. When you push on the top of those primary caps, do the plastic discs go down or is there pressure directly under them?

      Comment


        #4
        Re: Macron MPT-301 won't start

        Originally posted by c_hegge View Post
        sounds like it might have a shorted rectifier on the secondary bside
        bside ? - is b an abbreviation for back, or ??

        Anyway, all ICs on attached pics tested with Diode Test/Continuity of Fluke 77 - with black probe on middle leg, all gave brief beep when red probe touched to either side leg

        Originally posted by Pentium4 View Post
        When you push on the top of those primary caps, do the plastic discs go down or is there pressure directly under them?
        No, plastic discs don't go down - I assumed primary caps were like Ol' Man River, but maybe not necessarily
        Attached Files
        Last edited by pfrcom; 09-19-2014, 07:11 PM.
        better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

        Comment


          #5
          Re: Macron MPT-301 won't start

          I've been removing all manufacturing efforts like this - doesn't show continuity on DMM, but you never know
          Attached Files
          better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

          Comment


            #6
            Re: Macron MPT-301 won't start

            Originally posted by pfrcom View Post
            bside ? - is b an abbreviation for back, or ??
            I don't know how the b ended up there. I meant to say on the secondary side.

            Originally posted by pfrcom View Post
            No, plastic discs don't go down - I assumed primary caps were like Ol' Man River, but maybe not necessarily
            You might have bulging primary caps then. That could be the problem
            Last edited by c_hegge; 09-19-2014, 08:04 PM.
            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


              #7
              Re: Macron MPT-301 won't start

              Check the BYQ30E first, that's the +12V rectifier. Yeah, primary caps might be bad. It's pretty rare unless too much voltage goes through them.

              Comment


                #8
                Re: Macron MPT-301 won't start

                Originally posted by Pentium4 View Post
                Check the BYQ30E first, that's the +12V rectifier. Yeah, primary caps might be bad. It's pretty rare unless too much voltage goes through them.
                That IC was included in "all ICs on attached pics tested with Diode Test/Continuity of Fluke 77 - with black probe on middle leg, all gave brief beep when red probe touched to either side leg"

                Any other check I should be doing ?
                better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                Comment


                  #9
                  Re: Macron MPT-301 won't start

                  I guess we should have asked this earlier too, are you getting voltage to the primary caps? Are you getting +5VSB?

                  Comment


                    #10
                    Re: Macron MPT-301 won't start

                    Originally posted by Pentium4 View Post
                    I guess we should have asked this earlier too, are you getting voltage to the primary caps? Are you getting +5VSB?
                    Yes, it's getting +5VSB

                    Reluctant to measure voltage to primary caps - would scrap unit instead
                    better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                    Comment


                      #11
                      Re: Macron MPT-301 won't start

                      This is a good psu. Definitely worth repairing.

                      Comment


                        #12
                        Re: Macron MPT-301 won't start

                        Originally posted by pfrcom View Post
                        Reluctant to measure voltage to primary caps - would scrap unit instead
                        If you are getting 5V standby, in 99% of the cases, there is no need to measure voltage on the hot side. In 4+ years here, I can only recall one case there was 5V standby, but the big filter capacitor was bad because it was fluctuating in voltage.

                        You can, safely, measure the primary capacitors even using a cheap $5 830 multimeter (or any multimeter) if you use those clips to allow hands free measurement.

                        http://www.ebay.com/itm/200979921195

                        I usually connect the device under test to an external power bar with a rocker on/off switch. With this, I can safely be away from the primary caps and control the on/off and watch the meter reading.

                        The added advantage of this setup is you can see the big cap discharge on the multimeter.

                        Personally I dislike working on the ATX PSU form factor where everything is jam packed and crammed in there.
                        Attached Files
                        Last edited by retiredcaps; 09-20-2014, 06:01 PM.
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                        Comment


                          #13
                          Re: Macron MPT-301 won't start

                          Maybe overlooking the forest for the trees, but other threads here about MPT-301s have shown two thick yellow wires from the power input area going to SW1 & SW2 near the primary caps

                          For example https://www.badcaps.net/forum/showpo...17&postcount=1
                          and https://www.badcaps.net/forum/showpo...37&postcount=1

                          But on mine there's just two stubs broken off on SW1 & SW2, and no loose wires coming from the power input area

                          Can anyone enlighten me please, or provide a clear pic where wires from SW1 & SW2 connect to the power input area

                          Is it something to do with 240V here versus 110V ?
                          Attached Files
                          better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                          Comment


                            #14
                            Re: Macron MPT-301 won't start

                            They are probably for the voltage select switch, which is not included on your power supply
                            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


                              #15
                              Re: Macron MPT-301 won't start

                              Originally posted by c_hegge View Post
                              They are probably for the voltage select switch, which is not included on your power supply
                              +1

                              Do NOT connect these, or you will blow your primary caps!

                              Comment

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