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UPDATE: Dell Optiplex SX260 Computer Won't Boot Up

Discussion in 'Electronic Repair' started by [email protected], Feb 19, 2013.

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  1. Guest

    Hi,

    UPDATE:

    Every 2200uf 6.3V 105 deg. odd brand/no brand electrolytic capacitor
    (about 12) is bad on the mother board. Regarding the brand, I see what looks
    like, "2DIVDK", and in another location there is a "M" in a circle.

    There were no bulges in any cap, but a loss of capacitance as measured
    via a digital cap tester showing around 1400uf to 1500uf for these 2200/6.3
    caps. Often an increase in ESR will cause a lower cap reading on this tester.
    My ESR meter is not useful on large capacity caps.

    I will order replacements, but since I have other good working computers,
    I am in no hurry.

    Thanks again to everyone for your replies, John
     
  2. Phil Allison

    Phil Allison Guest

    ** A significant loss of uFs indicates VERY bad caps with high ESRs.

    Cos ESR rises first as the electrolyte vanishes up and only later does
    capacitance drop.


    .... Phil
     
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