FSP 300 Died. How to Troubleshoot

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • bigbeark
    Badcaps Veteran
    • Jan 2010
    • 661
    • Canada

    #1

    FSP 300 Died. How to Troubleshoot

    I was using this on a P3C-D board, I put the box away for a while, got it out yesterday and no response when I attempted to power on.

    I substituted another PSU and the machine booted up, so this PSU has a problem,

    I tested continuity in the plug, OK. Measured ESR of all caps, OK.

    Measured ESR of the "yellow suitcase" which I believe is the X caps = 13.54.

    The blue tantalums do not read at all on my ESR METER.

    Nothing appears burnt or bulged.

    I wrote the note re the Fan. It was pretty anemic, but I verified and it is not shorted. I tried the PSU in and out of the case.

    Any ideas? I like the fact that this PSU has the extra P4 connector.
    Attached Files
  • sofTest
    Badcaps Veteran
    • Aug 2008
    • 361

    #2
    Re: FSP 300 Died. How to Troubleshoot

    Check out the resistors. Some FSPs are known to have failed resistors.
    ------------
    Be a mensch

    Comment

    • Krankshaft
      Badcaps Legend
      • Jan 2007
      • 2328
      • USA

      #3
      Re: FSP 300 Died. How to Troubleshoot

      Check for standby power from the ATX connector when it's powered on.
      Elements of the past and the future combining to make something not quite as good as either.

      Comment

      • everell
        Badcaps Legend
        • Jan 2009
        • 1514
        • USA

        #4
        Re: FSP 300 Died. How to Troubleshoot

        Check your 5vsb - if it is dead, nothing will work.

        I had a Powerman FSP300-60BT, probably same model just under Powerman name. Problem was dead 5vsb. The 5vsb circuit uses a 1H0165R pwm chip which has 4 pins coming out of the bottom. Mine had a bad chip. Also the "critical" capacitor was high esr, a Fuhjyyu TNR 47 uF/35 volts.

        If your power supply has the same pwm chip, you will probably have a hard time finding a replacement. If replacement is needed, use Fairchild KA5H0165 which is a newer version and works well as a replacement. Also change that critical capacitor.
        Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

        Comment

        • kaboom
          "Oh, Grouchy!"
          • Jan 2011
          • 2507
          • USA

          #5
          Re: FSP 300 Died. How to Troubleshoot

          The standby supply in this unit leaves something to be desired. Back in '05, I found some high-res images of this supply and the 'ATX-350-60PN.'

          Compared to the 350, this one has:

          Transistor for standby power on a tiny little bracket instead of main switcher heatsink
          Components cramped around bracket and resulting hotspot
          Board discoloration around bracket in units that have been in service for a year or so
          GLUE!

          Go directly to the standby transistor. There will be a resistor from the emitter or source to the negative side of one of the big caps. If that transistor shorts from improper bias resulting from the 'critical cap' getting high ESR, that resistor will open.

          Regardless of what you find, please save yourself the trouble and aggravation and remove that glue! It's all over the DC link cap in that one pic, covering the top of the primary snubber resistor. See how it burns and gets crispy? It also gets conductive! Don't be afraid to remove all the components for the standby supply to clean them, as well as the board.

          -Paul
          "pokemon go... to hell!"

          EOL it...
          Originally posted by shango066
          All style and no substance.
          Originally posted by smashstuff30
          guilty,guilty,guilty,guilty!
          guilty of being cheap-made!

          Comment

          • mockingbird
            Badcaps Legend
            • Dec 2008
            • 5484
            • -

            #6
            Re: FSP 300 Died. How to Troubleshoot

            Regarding the 350-60PN I am actually in the process of recapping one, they were sold up till 2009 I think. Thanks for the information.

            Comment

            • kaboom
              "Oh, Grouchy!"
              • Jan 2011
              • 2507
              • USA

              #7
              Re: FSP 300 Died. How to Troubleshoot

              I've removed plenty of components and cleaned them and the board underneath of that useless glue. More supplies use it than don't.

              If I go to the trouble of recapping, that junk goes. It's a guaranteed problem- not if, but when. Between primary and secondary isolation barriers and across MOSFET gate and drain leads are the real 'hotspots.'

              Is your 350-60PN missing any PI-inductors? I just love how all the caps are on top of each other, with load resistors jammed in there... Remove them. Then just use an old HDD to test the unit out of the 'puter. Or a bunch of 12V bulbs, or a headlight. Those old ignition coil ballast resistors are great for loading 3.3 & 5.

              -Paul
              Last edited by kaboom; 03-28-2011, 04:57 PM.
              "pokemon go... to hell!"

              EOL it...
              Originally posted by shango066
              All style and no substance.
              Originally posted by smashstuff30
              guilty,guilty,guilty,guilty!
              guilty of being cheap-made!

              Comment

              • bigbeark
                Badcaps Veteran
                • Jan 2010
                • 661
                • Canada

                #8
                Re: FSP 300 Died. How to Troubleshoot

                I have finally gotten around to removing the standby components as per attached pic.

                Many thanks to Everell and Kaboom for your suggestions.

                Both the original and the replacement part number are obsolete at mouser, but there are Ebay Hong Kong listings for both parts.

                My problem is the resistor. As you can see the wire has gotten really hot.
                Can someone identify this resistor for me so I can find it on mouser?

                I am assuming both parts are burned out. I will be replacing all the caps on the PCB.Thanks again.
                Attached Files

                Comment

                • Wester547
                  -
                  • Nov 2011
                  • 1268
                  • USA.

                  #9
                  Re: FSP 300 Died. How to Troubleshoot

                  Seeing as how this isn't an uncommon failure, is something defective about the Fairchild part 1H0165R? Or do those parts just die when exposed to precarious amounts of heat (when mounted on small heatsinks)? I looked at the datasheet and the only hint of premature failure I could see is that it's only rated at 25C (room temperature or lower). It so happens that my Hipro 300W HP-P3527F3 has that very part.
                  Last edited by Wester547; 09-15-2012, 05:15 PM.

                  Comment

                  Related Topics

                  Collapse

                  • Tipa
                    Hp Omen 15-en1427no died
                    by Tipa
                    Hi,

                    I made a stupid mistake when I measured the fan connector (Omen 15-en1427no) and I had forgotten to disconnect the charging cable from the motherboard. Now the device won't turn on or charge. Is it possible that the CPU or GPU is damaged. I'm an amateur and I don't know how to troubleshoot the motherboard. Is it worth sending it to a professional for repair?

                    I will be glad if someone guides me.
                    ​...
                    01-28-2025, 01:09 AM
                  • fiveseventy
                    RX570 dies completely, then recovers.
                    by fiveseventy
                    Hello all,

                    I have a Sapphire Radeon RX 570 Pulse ITX 4GB (single fan) which has started misbehaving recently.
                    The card was bought used maybe 5 years ago and has worked without issue until recently.
                    I have no reason to believe it has been worked on or physically damaged.


                    For periods of time it will be 100% perfect.
                    Perfect temperatures, no glitches or artefacts, solid FPS.
                    I can game, run benchmarks, do whatever without any problem.
                    I can reboot the machine as many times as I like and nothing changes

                    however, most times...
                    06-22-2024, 05:29 AM
                  • techrepairheide
                    MacBook Pro (A1502 / 820-3476-A) - No orange/green light and no power
                    by techrepairheide
                    Hello again,

                    got an MacBook Pro from 2015, model A1502 and motherboard version 820-3476-A.

                    Device died over night on charger.

                    Currently I did the follow things:

                    1. Checked visuell the board, test with another MagSafe-Charger and with another DC-IN-board too
                    2. Measured 16,5V on ​PP18V5_DCIN_FUSE but 0V on ADAPTER_SENSE and 0V on PP_3V42_G3H and 0V on PPBUS_G3H but 16,5V goes to U7090
                    3. Because of corrosion and bad resistor values I changed these components: U7090 / C7094 / C7095 / R7095 / R7096 / L7095 / C7099 -> But further...
                    01-26-2025, 05:37 AM
                  • flat-earther
                    HP F4180 stopped working please help troubleshoot
                    by flat-earther
                    I was doing a large print job with my HP Deskjet F4180, and after about 50 pages the printer stopped in the middle of a page and the black ink light started flashing.
                    So I went to refill the black ink cartridge with a syringe, but found out it still had a lot of ink.

                    I tried to print a page again but every time it would print only a bit of the page and immediately stop with the black ink light flashing again.
                    I tried two other black ink cartridges, and the problem still endured, so I knew this problem had to be with the printer itself.

                    I ran HP Print and Scan...
                    05-11-2025, 02:21 AM
                  • tvguy12012012120
                    Zombie Samsung UN55NU6900F dead / no standby voltage - randomly came to life after hours of troubleshooting then died
                    by tvguy12012012120
                    This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

                    Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
                    02-07-2025, 05:13 PM
                  • Loading...
                  • No more items.
                  Working...