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Recapped Asus A7N8X Deluxe Rev 1.04

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    Recapped Asus A7N8X Deluxe Rev 1.04

    Congratulations for this great and amazing forum, and excuse that English is not my native language so I´ll try to do the best to tell my experience.
    I think most of the members are well enough into the capacitor issues, and that will save me from deep explanations.
    I am not an EE, just an enthusiast located in dark down Peru, South America
    I got hands on an Asus A7N8X Deluxe Rev 1.04 Serial # 31ZG095961, before it was gonna be thrown to the bin, together with all the case and psu. Only explanation received “The board wont POST nothing, we send the PSU to the case vendor and said it was okey, the board dealer (in US) asked to RMA the board and send it over for replacement. No way with shipping cost” I was told.
    Inspected closely the whole thing at home
    1) Rear fan in the case was NOT exhausting the air (installed backwards)
    2) Poorly ventilated case, no side intake air for the CPU, nothing on the front, a real stove/oven.
    3) 8 Nichicon 6.3V 3300uF bulged/hilly 4 of them with leaking signs, not recent, no smells.
    4) PSU tested, was OK within ranges
    The rest of components with no sign of distress or whatsoever.

    1+2=3? That is something that I will live for your thoughts, hence I´ve read that some badges of this board version carry a bad reputation and ton of issues.
    On a desesperate last intent to make this thing work I smashed all the 8 caps with a spoon!!!
    So you wont see them as hilly as I found them. Some pics of the board:

    (Ooops, forgot to set the date on camera)



    On the search of the adecuate caps to replace, the only thing available in town was a “Chang” brand of capacitor, as I havent heard a mention of that name except on the movies, had to steer to other sources.
    Luckily got hands on a complete replacement kit of “SAMXON” brand Low-ESR caps. Compliments to Joe (aka Big Pope). Thanks!!!!
    With all the caution, I proceed with the job
    Area to replace

    Take your pace, no hurry. Half painted circles help a lot with polarity...

    Time for a beer

    The SAMXON replacement team

    Almost done at this point, spread your legs…

    Homework done, I am sure that it can be done better than this.

    SAMXONS in place, a loyal Palomino 1.4 ready for sacrifice....


    As expected the recapped board did not post, bios seems to be the front burner on this cap disasters, so it had to be reflashed.
    For this purpose I used a similar board (Asus A7N8X Deluxe Rev 2.0 s/n 34ZGOG0719) doing the hot-swapping trick. and ....voala!

    Lets now compare both boards under fair conditions. (Im looking for STABILITY, at the end, this board is like a hurt war vet, shouldnt expect it to perform as my Rev 2.0 board…)
    Guests to the party:
    Superlocked XP2400+ AIXJB0401
    Matrix DDR 512MB PC3200 stick
    Illusion Golden PSU (PSP4600) 680watt
    Akasa 825 Colour Carnival Cooler

    Method: FSB adjustment applied manually on 1mhz steps, verified with nVidia nTune Stability Tests v5.05.18.00 utility, till any instability issue showed up(hang-up or reboot), if so, it was stepped back 1 mhz, and again to burn test. Default bios voltages for all components on both boards.
    After final setting was achieved, runned on both boards for 24 hours, this is the final outcome:


    Recapped 1.04 board max FSB accepted 148mhz



    Standard 2.0 board max FSB accepted 145 mhz



    After recapping the Rev. 1.04 board it had this main capacitors:
    -8 SAMXON 6.3V 3300uF GC(M)
    -16 OST 6.3V 1000uF RLS

    The version 2.0 board has never been recapped or modified, tested on its standard presentation:
    -8 NICHICON 6.3V 3300uF HM (M)
    -14 OST 6.3V 1000uF RLS
    -2 CHEMICON 6.3V 820uF KZG

    Both boards were biosed with the Asus 1008 version.
    Gentleman, my preliminary conclusion is that the SAMXON recapped board shows a better stability than a similar board with the NICHICON caps.
    It will take some more time of testing to give my definitive impression, will now submit both boards to the anger hands of my son (13year old avid gamer) for a 3 month individuall test period.
    On the meantime, will wait the Great Capacitor Showdown!!!
    Chris
    Attached Files

    #2
    Re: Recapped Asus A7N8X Deluxe Rev 1.04

    This are the photos for my previews post.











    Attached Files

    Comment


      #3
      Re: Recapped Asus A7N8X Deluxe Rev 1.04

      Swap out the OST RLS caps on the v1.04 board, and you'll probably do even better. Even the relatively widely available NCC KZG should do better than the OSTs.

      Comment


        #4
        Re: Recapped Asus A7N8X Deluxe Rev 1.04

        Originally posted by linuxguru
        Swap out the OST RLS caps on the v1.04 board, and you'll probably do even better. Even the relatively widely available NCC KZG should do better than the OSTs.
        Im willing to do it as soon as somebody in earth explains me what the heck are those couple of Chemicons doing on the Rev 2.0 board or who´s idea was it, there might be a reason...

        Comment


          #5
          Re: Recapped Asus A7N8X Deluxe Rev 1.04

          Thos Ost RLS aren`t that bad. Will has tested some of those, his mesurements arren`t that bad. As long as they anre`t used directly in an VRM, i would let them in place. Any way, if you want to max the board out, may be some Panasonic FM or Samxon GD / GC would be well suited. May be, those Ost RLS caps have had a to high ESR. KZG series has ultra low esr, thus may be this was required on that location.

          Comment


            #6
            Re: Recapped Asus A7N8X Deluxe Rev 1.04

            Originally posted by gonzo0815
            Thos Ost RLS aren`t that bad. Will has tested some of those, his mesurements arren`t that bad. As long as they anre`t used directly in an VRM, i would let them in place. Any way, if you want to max the board out, may be some Panasonic FM or Samxon GD / GC would be well suited. May be, those Ost RLS caps have had a to high ESR. KZG series has ultra low esr, thus may be this was required on that location.
            Thanks, I am pointing out on this diagram where those Chemis are located, there are a couple of toroids (?) close to them. Any clue of why Asus made this change?

            Attached Files

            Comment


              #7
              Re: Recapped Asus A7N8X Deluxe Rev 1.04

              Asus most probably did that ECO (swapping the OST RLS for NCC KZG) at that location because the OSTs may have been failing frequently on the 1.04 board there. That wouldn't be too surprising, because a) it's near what seems to be a buck converter; b) the airflow at that location isn't terribly great because a bunch of cables usually clutters up that place; and c) that location is also a dead zone for airflow in most ATC cases, regardless of the cable clutter.

              Comment


                #8
                Re: Recapped Asus A7N8X Deluxe Rev 1.04

                your image tags are correct but you have to copy and paste the attachment location not just the filename.

                image posting faq
                https://www.badcaps.net/forum/showthread.php?t=1868

                anyway your images are too big for inline so i am not going to fix the links.
                capacitor lab yachtmati techmati

                Comment


                  #9
                  Re: Recapped Asus A7N8X Deluxe Rev 1.04

                  Originally posted by willawake
                  your image tags are correct but you have to copy and paste the attachment location not just the filename.

                  image posting faq
                  https://www.badcaps.net/forum/showthread.php?t=1868

                  anyway your images are too big for inline so i am not going to fix the links.
                  Parakalos

                  Comment


                    #10
                    Re: Recapped Asus A7N8X Deluxe Rev 1.04

                    the ost i have been seeing in less critical areas are not bulging but i replace anyway.
                    several measured .25 ohm esr.new mbz 1000@6.3 measure .015.

                    Comment


                      #11
                      Re: Recapped Asus A7N8X Deluxe Rev 1.04

                      Seems that there is a concidence in the fact that ALL the main capacitors should be replaced at once (by "main" I mean the 1000uF or above, and please correct me if Im wrong) to have a good starting point for a reccaped mobo, no matter where they are located.
                      As of now I am more concerned on my rev2.0 board, even being newer than the reccaped it has been now outperformed.
                      Ive read in other threads about rev2.0`s coming from the box with other than Nichicons 6.3V 3300uF, have I been screwed on this? Or even "serious" manufacturers just take whatever caps they have in stock for a badge of boards?

                      Comment


                        #12
                        Re: Recapped Asus A7N8X Deluxe Rev 1.04

                        The idea is to recap everything at once to avoid the hassle and replication of work to disassemble and re-assemble a system many times. If there's one bad capacitor of a particular series in a system, the odds are good that all others of the same series will eventually fail, one after another. So it's best to replace them all together.

                        Yeah, manufacturers will take whatever caps are available on inventory or on the spools of the insertion machines to keep the assembly lines going. If they're going to wait for delivery of the good caps, they're losing money. The lead times for delivery from the good capacitor manufacturers can be 4-6 weeks.

                        Comment


                          #13
                          Re: Recapped Asus A7N8X Deluxe Rev 1.04

                          Well, those Chemicon caps are located at the in- and output of the buck regulator VRM unit for Vmem. At this point, there is some higher ripple current requirement, and probably more important, the output ripple has to be as low as possible, as the memory won`t like that. Now, the Ost RLS caps do not have the ultimately low esr (about 60 to 80 mili ohm), wich cause a higher output ripple noise.
                          The most simple way to reduce it, is to lower the ESR. Thus those KZG or KZE have far lower ESR.
                          The other caps are probably only for simple decoupling and to maintain a equal voltage level throughout the whole pcb. Thus i think those OSt rls are ok for that.
                          Last edited by gonzo0815; 11-21-2006, 10:26 AM.

                          Comment


                            #14
                            Re: Recapped Asus A7N8X Deluxe Rev 1.04

                            Originally posted by gonzo0815
                            Well, those Chemicon caps are located at the in- and output of the buck regulator VRM unit for Vmem. At this point, there is some higher ripple current requirement, and probably more important, the output ripple has to be as low as possible, as the memory won`t like that. Now, the Ost RLS caps do not have the ultimately low esr (about 60 to 80 mili ohm), wich cause a higher output ripple noise.
                            The most simple way to reduce it, is to lower the ESR. Thus those KZG or KZE have far lower ESR.
                            The other caps are probably only for simple decoupling and to maintain a equal voltage level throughout the whole pcb. Thus i think those OSt rls are ok for that.
                            Thanks a lot Gonzo (& Linuxguru + kc8adu) for your input. Scenario is a little bit clear for me on that VRM area of the board. Would you honor me checking this specs
                            They belong to the SAMXON GC(M) series, if you see any problem in covering the 2 buck area caps with this? I would be placing the 6.3V 1000uF cans, on there, or do you think I am better of with the KZG`s? How do you see their ESR, provided that you think that OST`s are okey there?
                            Great thanks.

                            Comment


                              #15
                              Re: Recapped Asus A7N8X Deluxe Rev 1.04

                              Originally posted by linuxguru
                              The lead times for delivery from the good capacitor manufacturers can be 4-6 weeks.
                              God, I wish...... I've waited sometimes 4 months for shipments from Rubycon... They've left my ass hanging in the breeze more than once when I ran out.... lol
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                              Comment


                                #16
                                Re: Recapped Asus A7N8X Deluxe Rev 1.04

                                Your results for the recapped board outperforming the other have too many variables to draw any conclusion. Grab any two identical boards and you may find a similar slight variance.

                                It could be that the rev 2 board has had it's caps age now, or that some of those surface mount parts (like resistors) tolerances cause deviation in things like signaling or chipset voltage to each, parts substitutions on other areas from lot to lot of boards, or random luck with chipset revisions - they'll all cut from same wafer but not all are equal towards the edges.

                                Far far too many things to consider, you would have to take a brand new board and only run it long enough to test, and then recap the same board to get more meaningful results.

                                Comment


                                  #17
                                  Re: Recapped Asus A7N8X Deluxe Rev 1.04

                                  I have the same rev motherboard (a7n8x deluxe uay rev1.04 ) with 2 leaky and 6 buldging HM 3300 uF 6.3 V caps)
                                  steadily going down hill as far as boot reliablility. Changed the power supply and used very conservative motherboard settings to fix this 3 months ago but now it won't even make that first beep and a bios clear fails to fix it.

                                  Hoping that replacing the caps would be painless and get me going again.

                                  I am not experience doing this, but wouldn't mind trying.

                                  How much would a suitable kit be? Where would I find such a kit?

                                  If I send it in how much would it be?

                                  Thanks.

                                  Comment


                                    #18
                                    Re: Recapped Asus A7N8X Deluxe Rev 1.04

                                    Some NICHICON HM and HN with date codes from 2002 to 2004 were defective.
                                    They were overfilled with electrolyte and they burst/leak.
                                    [I say 'some', it may be 'all'. No one is sure.]

                                    OST are a bad brand.
                                    Chemicon KZG aren't so great if they are near a hot spot.

                                    First make a capacitor map of your motherboard and include the polarity of the original caps.
                                    - This is in case you get interrupted while working and forget which way a cap was.
                                    - Also the polarity marks on the motherboards are sometimes wrong.
                                    - And it's easier to make a list from.

                                    Then make a list of what caps you need and order them.

                                    While you are waiting for the order, get something that doesn't matter and practice soldering.
                                    [Old video card, old motherboard you don't care about, whatever.]
                                    For practice you can remove and install the same caps.
                                    [It's a little harder to do and will make you better.]

                                    When the new parts get there you will be all ready to go.

                                    .
                                    Mann-Made Global Warming.
                                    - We should be more concerned about the Intellectual Climate.

                                    -
                                    Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

                                    - Dr Seuss
                                    -
                                    You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                                    -

                                    Comment


                                      #19
                                      Re: Recapped Asus A7N8X Deluxe Rev 1.04

                                      I think randomhtpcguy got rid of this motherboard nine months ago: anyway thanks for informations.

                                      Zandrax
                                      Have an happy life.

                                      Comment


                                        #20
                                        Re: Recapped Asus A7N8X Deluxe Rev 1.04

                                        New people search here looking for help all the time.
                                        It's best to keep even the old threads up to date.
                                        - So I do when I wander into one.
                                        Mann-Made Global Warming.
                                        - We should be more concerned about the Intellectual Climate.

                                        -
                                        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

                                        - Dr Seuss
                                        -
                                        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                                        -

                                        Comment

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