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MORE UPDATE: Dell Optiplex SX260 Computer Won't Boot Up

Discussion in 'Electronic Repair' started by [email protected], Feb 24, 2013.

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  1. Guest


    More Update:

    I replaced every one of those 2200/6.3V with new Nichicon 2200uf 10V
    105 deg. caps (verified good by testing them), but that did not fix the
    problem. The symptoms are exactly the same as I described in my original
    post. Note: I also replaced some other caps that had higher than normal ESR
    (eg. 220uf 16V caps).

    Note: I measured in circuit the +5V and +12V voltage sources, and both
    were "clean" (scoped) and at the proper level.

    Without a schematic, there isn't much more I can do. I have decided to
    abandon this repair attempt.

  2. Jamie

    Jamie Guest

    how about the 3.3V ? How About the - voltages from the supply?

    How about removing some cards like the video card to see if it'll post?

    How about checking the actual on button on the cabinet?

    Unplug the HD to see if you get a post ?

    Have you removed memory chips?

    lots to look at..

    There is always that possibility you have a bad MB.....................
    like Flash rom bad ( no bios) CPU is dead from over heating, small
    onboard processor not work etc....

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