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    #1

    Asus A7N8X-X spontaneous reboot

    Board looks in fine condition, no capacitors bulging

    VRM has Nichicon HM 3300uf with 2003 datecodes

    Most of the other capacitors are OST 1000uf

    For testing, it's running a Sempron 2300 which uses 166 FSB, and a single Kingston PC2700 ValueRAM

    Both processor and memory have been tested fault-free in my A7N8X Deluxe

    As an aside, the -X PCB looks identical to the Deluxe PCB, and uses the same capacitors, but the -X is built in China instead of Taiwan, and omits ICs which support features that -X doesn't have, like Silicon Image SATA controller

    Problem is, it will run Memtest without problems for about an hour, then spontaneously reboot

    Reboot is the wrong word, because after this happens it will start rebooting for a couple of seconds, give a single BIOS check OK beep, power off, pause a few seconds, then repeat this cycle

    At this point, only way to get a successful reboot is to leave it a while - a day later, it starts OK again

    Power supply is a CWT 300w, has no problem with any other board, including the A7N8X Deluxe

    Heatsink is mounted correctly, seems to be functional

    -X BIOS is updated to latest 1010, which introduces Sempron support

    Dick Smith ESR meter doesn't show any abnormalities

    I'm reluctant to just scrap the board, but in this case I wonder if I'm flogging a dead horse

    Has anyone had a problem like this, and managed to fix it ?
    better to keep quiet and be thought a fool, than to open your mouth and remove all doubt
    Tags: None
    #2
    Re: Asus A7N8X-X spontaneous reboot

    Bump !
    better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

    Comment

      #3
      Re: Asus A7N8X-X spontaneous reboot

      >>Dick Smith ESR meter doesn't show any abnormalities<<
      That is -usually- okay for -individual- caps. However, you can not test VRM caps on the board. They are in parallel and resistance in parallel is always LOWER than the lowest value component. The meter(s) only go down to .01 resolution. Several bad will not affect the reading, and would falsely give you a .00 indication.

      As an example, take the ESR of 6 caps in parallel with these individual readings:
      .01, 1.0, 2.0, 3.0, 4.0, 5.0 = .00977
      The meter will show .00 and mislead you to thinking they're good.

      If it were mine, all the OST's would go. HM's can fail without any indication.

      You could also be seeing a BGA problem with one of the "bridges". Because of the many early problems with lead-free soldering (cold joints), you may want to check into that. Also, see if either one feels hot to the touch when the problem happens.

      How about swapping out the memory with another or just use one stick at a time?

      Toast
      veritas odium parit

      Comment

        #4
        Re: Asus A7N8X-X spontaneous reboot

        OST and bad-date HM should go as preemptive even if not bad yet.
        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

          #5
          Re: Asus A7N8X-X spontaneous reboot

          I had a similar problem with an A7N8X-X. Also the -X lacks the dual channel which is ok because the platform didn't use it very well anyways.

          Here was the problem:

          The computer was booting and it said "AMD Athlon XP 3200+" so I thought nothing of it. But then I would get random error messages in Windows until I finally figured out that the processor was a 2500+ and the BIOS was not detecting it properly. (And to top that off, CPU-Z was also reporting it as a 3200+).

          Go into the BIOS and make sure your FSB and Multiplier and AGP and PCI dividers are ok.
          "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

          -Leonid Brezhnev (On the Yom Kippur War)

          Comment

            #6
            Re: Asus A7N8X-X spontaneous reboot

            There was a BIOS glitch a while back that caused BIOS's to report:
            "Genuine AMD Procussor"
            in the flash screen.

            Was simply a typo in the base BIOS code [as in AMI or Award or whoever did it, not the mobo manufacturer] so it affected several brands of mobo.

            Got fixed with BIOS updates but it had a lot people chasing their tails for a while.
            A lot of people thought they had counterfeit CPUs.
            .
            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

              #7
              Re: Asus A7N8X-X spontaneous reboot

              did you check the psu?
              sigpic

              (Insert witty quote here)

              Comment

                #8
                Re: Asus A7N8X-X spontaneous reboot

                Power supply is a CWT 300w, has no problem with any other board, including the A7N8X Deluxe
                And still doesn't
                better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                Comment

                  #9
                  Re: Asus A7N8X-X spontaneous reboot

                  Got this board yesterday for repair and found 2 KZGs 820uf bad near RAM
                  PC was randomly restarting, BSOD if I'm right
                  maybe it can help
                  Last edited by Ant3G; 09-06-2011, 09:23 AM.

                  Comment

                    #10
                    Re: Asus A7N8X-X spontaneous reboot

                    Originally posted by pfrcom View Post

                    Reboot is the wrong word, because after this happens it will start rebooting for a couple of seconds, give a single BIOS check OK beep, power off, pause a few seconds, then repeat this cycle


                    Heatsink is mounted correctly, seems to be functional

                    -X BIOS is updated to latest 1010, which introduces Sempron support
                    I have the same BIOS, and the rebooting sounds exactly like when the Windows kernel detects a problem and reboots, I dunno if it's even possible for Memtest86 and Linux kernel to reboot itself because it got pissed off.

                    That's typical Windows NT kernel-pissed-off behavior.
                    (During Windows' equivalent of a kernel panic) (Windows 2000 and later)

                    But mine has United Chemicon KZGs and still zero problems so far here.

                    And powering off sounds more like the PSU!
                    Last edited by RJARRRPCGP; 09-06-2011, 06:49 PM.
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                    Comment

                      #11
                      Re: Asus A7N8X-X spontaneous reboot

                      cwt=fuhkyyu caps.
                      also push down on the northbridge while it it doing this.had one in a custom pipe bender do this.running 2k and would bsod and do several loops then power off.a reflow fixed it.
                      Last edited by kc8adu; 09-07-2011, 06:56 AM.

                      Comment

                        #12
                        Re: Asus A7N8X-X spontaneous reboot

                        Talk about resurrecting an old thread ....

                        I can't recall what I did with that board, most likely scrapped - if I had fixed it, would have posted the answer
                        better to keep quiet and be thought a fool, than to open your mouth and remove all doubt

                        Comment

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