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Design Flaw on MSI 694D Pro ver:1.0

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    Design Flaw on MSI 694D Pro ver:1.0

    I have seen this on every MSI 694D Pro 1.0 I've recapped. Between PCI slots 2 and 3, resides C390. The cap value stock is 1000uF 6.3v. Of course upon receiving the board, this cap is vented like many others. I recapped the board, of course replacing C390. I then would connect the board to my jig and burn it in for a while... Within the first 30 minutes or so, C390 would be vented again. I checked to make sure I installed it correctly, and the correct voltage. It was correct, so I assumed I had a dud for a replacement cap (Rubycon's, so this scenario was unlikely). I replaced it again, and tested again... Same result. Within the first 30 minutes, C390 vented again. Through this whole ordeal, the board was working fine.

    At this point, I was puzzled... So I flipped the board over and read the voltage on the cap while the board was powered up and running the tests. On C390, I placed the '+' meter lead on the '+' cap lead, same thing with the neg leads. To my surprise, there was a -3.9v on the cap. I had to do a doubletake and make sure I had the leads attached correctly, and they were. There is a negative voltage on the C390 position when reading the cap position according to the polarity marking on the board.

    I installed another Rubycon replacement, only this time I installed it backward. Opposite of the board polarity markings, and the board has been running flawlessly for over a week now, no more venting of C390.

    Like I said, I've seen this on MANY MSI 694D Pro boards, so it was not an isolated case, or just a 'quirk' with one particular board. I will post some pics soon.
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    #2
    Re: Design Flaw on MSI 694D Pro ver:1.0

    Interesting! Nice find.

    Comment


      #3
      Re: Design Flaw on MSI 694D Pro ver:1.0

      This post is well over a year old! Guess Topcat didn't get those pics "soon"
      Ludicrous gibs!

      Comment


        #4
        Re: Design Flaw on MSI 694D Pro ver:1.0

        So my question is, Do you suggest to all 694D owners to install this one backwards?

        Comment


          #5
          Re: Design Flaw on MSI 694D Pro ver:1.0

          this is quite strange indeed.
          I have 2 of these boards exactly as described. They were given to me as dead boards that a friend of mine tried to replace the 2700uf caps. He used them as servers until the 2700uf's blew. The c390 caps don't look bad but.... I'm tempted to try this. The only thing is that venting after 30mins, that's insanley fast. By those standards the board shouldn't have worked to begin with.

          Comment


            #6
            Re: Design Flaw on MSI 694D Pro ver:1.0

            Then it was most likley installed reversed, note that on some mobos the silkscreen is incorrect so check with a multimeter...
            "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment


              #7
              Re: Design Flaw on MSI 694D Pro ver:1.0

              Nice article Topcat, always nice to see manufacturers making mistakes.
              Rubycon Rubycon Rubycon

              Comment


                #8
                Re: Design Flaw on MSI 694D Pro ver:1.0

                i didnt know those msi boards came with a coupon for a free cup of fail!
                sigpic

                (Insert witty quote here)

                Comment


                  #9
                  Re: Design Flaw on MSI 694D Pro ver:1.0

                  Does this wrong polarity capped issue happens on Intel's Motherboard too? I've encountered many Intel motherboards with bulging caps even though high quality caps were used.

                  Comment


                    #10
                    Re: Design Flaw on MSI 694D Pro ver:1.0

                    Not that I'm aware of. Sometimes they used Nichicon HM/HN which are not as high quality as some think. Nichicon are japanese, but the HM and HN had manufacturing flaws which they fixed in 2005. If the caps were made in or before that year, they would have been affected.
                    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

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