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BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

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    #1

    BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

    i have a GA-VM900M REV.2. bought from junkman..
    i am writing post from this board.

    there are 2 swallon and 1 broken off caps middle of the board.
    The back line of this area is red and fried.

    i changed these caps with Nichigan.
    and i realize that couple of mosfets is overheated these are near the bad caps.their name are 40TO3GH.

    i could not put my finger more than 3 seconds one, 5 seconds other.

    all of them swapped. overheat is disappear now.
    i can put my finger at least 15 seconds.



    pics will be add.
    Last edited by mikail13; 08-03-2015, 03:40 AM.
    Tags: None
    #2
    Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

    Stop!!!!! Immediately stop using those replacement caps!! They are unreputable and can do more harm than good! Also, it is never a good idea to use any electronic device with bad caps. It can kill the board dead.
    Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

    My computer doubles as a space heater.

    Permanently Retired Systems:
    RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
    Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


    Kooky and Kool Systems
    - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
    - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
    - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
    - Main Workstation - Fully operational!

    sigpic

    Comment

      #3
      Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

      Nichigan. Is that Rulycon's brother?

      Comment

        #4
        Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

        Originally posted by Heihachi_73 View Post
        Nichigan. Is that Rulycon's brother?
        Wondering what's next. United Radio-con?
        Main rig:
        Gigabyte B75M-D3H
        Core i5-3470 3.60GHz
        Gigabyte Geforce GTX650 1GB GDDR5
        16GB DDR3-1600
        Samsung SH-224AB DVD-RW
        FSP Bluestorm II 500W (recapped)
        120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
        Delux MG760 case

        Comment

          #5
          Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

          Originally posted by TechGeek View Post
          Stop!!!!! Immediately stop using those replacement caps!! They are unreputable and can do more harm than good! Also, it is never a good idea to use any electronic device with bad caps. It can kill the board dead.
          maybe i couldn't do clear explanation.

          i desolder fat caps.

          changed with normal caps. value's normal.. 1000 mF.

          Comment

            #6
            Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

            Originally posted by mikail13 View Post
            maybe i couldn't do clear explanation.

            i desolder fat caps.

            changed with normal caps. value's normal.. 1000 mF.
            The problem is they are counterfeit. The good brands are Rubycon,Nichicon and Panasonic. What you have is a counterfeit copy of the Nichicon brand.
            Main rig:
            Gigabyte B75M-D3H
            Core i5-3470 3.60GHz
            Gigabyte Geforce GTX650 1GB GDDR5
            16GB DDR3-1600
            Samsung SH-224AB DVD-RW
            FSP Bluestorm II 500W (recapped)
            120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
            Delux MG760 case

            Comment

              #7
              Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

              Originally posted by Dan81 View Post
              The problem is they are counterfeit. The good brands are Rubycon,Nichicon and Panasonic. What you have is a counterfeit copy of the Nichicon brand.
              i don't remember the full name. maybe i'm wrong spelling
              i will control it.

              but pic are here..
              Attached Files

              Comment

                #8
                Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                Originally posted by Heihachi_73 View Post
                Nichigan. Is that Rulycon's brother?
                Sorry. This is nichicon..

                is this good one?

                Comment

                  #9
                  Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                  Nichicon is a good brand.
                  Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.

                  My computer doubles as a space heater.

                  Permanently Retired Systems:
                  RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
                  Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.


                  Kooky and Kool Systems
                  - 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
                  - 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
                  - 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
                  - Main Workstation - Fully operational!

                  sigpic

                  Comment

                    #10
                    Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                    The failed caps look like Toshin Kogyo ATWB or ATWY series. You should replace ALL of these capacitors. I have seen tons of them fail on 775 boards, they are very bad series, I've even seen them take out a chipset. What series nichicon caps do you have?

                    Comment

                      #11
                      Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                      strange that they used shit caps but still put a sepc poly there!

                      Comment

                        #12
                        Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                        ^ They do that so as to get it to outlast the warranty period. And possibly because ultra low ESR lytics have been going out of production for a while now and because polymers have much better conductivity.

                        And yes, TK's ATWY and ATWB series are egregiously bad. Worse than KZG and KZJ and only a notch above Sacon FZ/GSC.

                        Comment

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