BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

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  • mikail13
    Senior Member
    • Aug 2013
    • 93
    • Turkiye
    #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
    • TechGeek
      Computer Geek
      • Jan 2015
      • 2254
      • USA
      #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

        • Heihachi_73
          Badcaps Veteran
          • Jun 2012
          • 713
          • Australia
          #3
          Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

          Nichigan. Is that Rulycon's brother?

            Comment

            • Dan81
              SNES-powered
              • Oct 2013
              • 1866
              • Romania
              #4
              Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

              Originally posted by Heihachi_73
              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

                • mikail13
                  Senior Member
                  • Aug 2013
                  • 93
                  • Turkiye
                  #5
                  Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                  Originally posted by TechGeek
                  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

                    • Dan81
                      SNES-powered
                      • Oct 2013
                      • 1866
                      • Romania
                      #6
                      Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                      Originally posted by mikail13
                      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

                        • mikail13
                          Senior Member
                          • Aug 2013
                          • 93
                          • Turkiye
                          #7
                          Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

                          Originally posted by Dan81
                          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

                            • mikail13
                              Senior Member
                              • Aug 2013
                              • 93
                              • Turkiye
                              #8
                              Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

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

                              is this good one?

                                Comment

                                • TechGeek
                                  Computer Geek
                                  • Jan 2015
                                  • 2254
                                  • USA
                                  #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

                                    • Pentium4
                                      CapXon Be Gone
                                      • Sep 2011
                                      • 3741
                                      • USA
                                      #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

                                        • stj
                                          Great Sage 齊天大聖
                                          • Dec 2009
                                          • 31246
                                          • Albion
                                          #11
                                          Re: BAD CAPS AND OVERHEATED MOSFETS at GA-VM900M

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

                                            Comment

                                            • Wester547
                                              -
                                              • Nov 2011
                                              • 1268
                                              • USA.
                                              #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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