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    #1

    Sf-650r14he

    Hi,

    Need some general advice,

    I have a SF-650R14HE that has the following issue.

    1/ When the PC is not under any sort of load, the PC will randomly shutdown. If I try to power it back on the PC will not power up. LED on the motherboard stays lit at all times.
    I have to unplug the PSU, let sit for a few moments, then the PC will power back on when I press the power button.
    2/ When the PC is on, it will randomly reboot, usually a PC shutdown occurs first, but sometimes a reboot occurs before the random shutdown.

    What I have done.

    1/ The PSU is not particularily clogged up.
    2/ Ive replaced some caps that I though may be the issue but the problem persists, to be precise I replaced

    2 x 3000uF 10v
    1 x 2700uF 10v
    2 x 3000uF 16v
    1 x 330uF(M) 400v

    Measuring all the rails independantly (3.3/5v/12+- etc) all readings seem normal.

    What else should I be looking at to see what is causing these issues ?

    I know its not a motherboard issue as replacing the PSU resolves the shutdown/reboot problems.

    Any input would be appreciated !

    :-)
    Last edited by mongobongo; 08-02-2014, 03:05 AM.
    Tags: None
    #2
    Re: Sf-650r14he

    What voltage does the 5vsb rail measure? On most power supplies it is the violet wire.
    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

    Comment

      #3
      Re: Sf-650r14he

      Hi, apologies for the late response (didnt receive notification email, will check my settings !), the 5vsb measures 5.03v

      Thanks
      Last edited by mongobongo; 08-11-2014, 03:18 AM.

      Comment

        #4
        Re: Sf-650r14he

        Nobody ??

        Comment

          #5
          Re: Sf-650r14he

          Good clear pictures straight on top and bottom and some from the sides at an angle might help - its difficult if you cant see!

          What caps did you use as replecements - make and series.

          Try puttiing loads on the output 12v car sidelight bulb fans etc.
          Last edited by selldoor; 08-18-2014, 05:14 AM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

            #6
            Re: Sf-650r14he

            Here are the pics.

            @selldoor

            Regards loading the 12v rail, are you wanting me to take a measurement off the 12v rail while loaded (just trying to figure out why you have only asked me to load the 12v rail) ??

            Cheers
            Attached Files

            Comment

              #7
              Re: Sf-650r14he

              Did you check all the caps with esr/capacitance meter?

              Also check solder side for shorts, bridges etc.

              I would also check the toroid coils for burnt glue that gets conductive and can short turns of copper.

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