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MS-6340 v1 - really weird problem

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    #1

    MS-6340 v1 - really weird problem

    I have a MSI MS-6340 v1 board with a really weird problem. When powered up, it works fine. After a couple of minutes, it starts to do silly things - characters displayed at wrong place in text mode, crashing, hangs, then it sometimes hangs before POST. When powered down for some time, it cools down and works again for a while. Never seen this before. Checked CPU and chipset voltages and they're OK.
    I guess that this is not capacitor problem. The board has 6 big 3900uF/10V Yageo caps and although there are some smaller craps - one 2700uF/6.3V Tayeh, six 1000uF/6.3V Chsi - they all look fine.
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    #2
    Re: MS-6340 v1 - really weird problem

    Check for ripple on the voltages, too.
    PeteS in CA

    Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
    ****************************
    To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
    ****************************

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      #3
      Re: MS-6340 v1 - really weird problem

      I would if I had an oscilloscope

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        #4
        Re: MS-6340 v1 - really weird problem

        What buck controller does it have? I have a socket A MSI mATX (don't remember the exact model number and can't check it right now) that had SC1155 and was unstable and did all kinds on weird things.

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          #5
          Re: MS-6340 v1 - really weird problem

          SC1155CSW... Maybe adding some ceramic and tantalum caps will help. Looks like I really need an oscilloscope
          I've read somewhere that many of these boards have stability problems - maybe not only from bad caps but also from this.

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            #6
            Re: MS-6340 v1 - really weird problem

            Does the buck controller get hot? Mine got hot when the board crashed. I read in some kind of Russian message board that replacing the inductors would help... But there were no values given or something.

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              #7
              Re: MS-6340 v1 - really weird problem

              Don't remember if it gets hot but letting fan blow on the board make it run a bit better.
              Yes, the inductor looks really weird - never seen anything big like that on any other board (the caps are huge too).

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                #8
                Re: MS-6340 v1 - really weird problem

                All I did was replace the 2700uF-6.3v cap and now it runs fine

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                  #9
                  Re: MS-6340 v1 - really weird problem

                  I've already replaced that Tayeh (only one on the board) but it didn't help at all so I put it back.

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                    #10
                    Re: MS-6340 v1 - really weird problem

                    Knowing that those SMD 10uF/16V caps go bad on MSI boards, I checked them on this one too. ALL of them were bad, of course - ESR at least 100 ohms, some completely open (>300). I replaced them all and also all 1000uF Chhsi caps, one 100uF and one Tayeh 2700uF. And guess what? No change!

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