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    Asus A8V fails to boot

    My mobo a8v had some display issues, displaying some dots which I attributed for a bad driver or failing video card, but I continued to use it until it does not boot anymore. Only then I replaced the psu Antec, which still works, with a brand new one make Young Year & replaced the video card with another good AGP card as well as a PCI one but still no boot. Also replaced the memory card with other Kingston which I know is good but still no boot.

    On power on the cpu fan & the power led works but there is no beep & no display on the vdu, even after trying several times.

    The mobo has 6 * KZG 1500uf 6.3v caps but seems good, by looking at it as I did not remove it to test & I don't have an ESR meter either, although they are cathegorised to be bad caps & also 4 Nichicon 1000 uf 16v.

    Will the board be ok if I replace only the 6 KZG only? or is there any other issues!

    Also can I replace the KZG with Rubycon MBZ 2200uf 6.3v from an old abit ku8 mobo as in my island not sure I can get low ESR caps. The best that I seen are LXZ & some Rubycon YXG of 1000uf 16v.
    Last edited by fongfah; 12-24-2008, 04:58 PM.

    #2
    Re: Asus A8V fails to boot

    I replaced the 6 KZG with the Rubies & still no boot with processor & one ddr ram in slor A. However when I moved the dimm to sockets b i.e. third one, it is now ok. Only the 2 dimm slots 3rd & 4th are ok.

    What could be wrong as initially all dimm sockets were filled with 2* 1gb + 2 * 512 mb. I guess that the problem was not bad caps!

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      #3
      Re: Asus A8V fails to boot

      Many DDR boards have problems with 4 sticks of RAM installed.
      Reference design was 'under built' and the RAM VRs have trouble keeping RAM voltage in spec.
      Bad caps (aging caps) will make one that's just barely okay go bad after a while.

      You may also have a bad VR or cap that only affects power to the first two slots.

      .
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        #4
        Re: Asus A8V fails to boot

        Thks for the info.

        Will see if next time I can pass special order some low ESR from the electronic shop.

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