checking power supply

Discussion in 'Computer Information' started by Jill, Sep 1, 2006.

  1. Jill

    Jill Guest

    Anyone know of an easy way to check the power supply on a W98 machine? Is
    it possible that It (the power supply) is bad and the PS still runs? The
    machine quit booting.
     
    Jill, Sep 1, 2006
    #1
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  2. Jill

    bmoag Guest

    If you hit the on button, and the machine is plugged in to a working socket,
    and nothing happens it is a good bet the power supply is not working.
    However there could also be other problems.
    Even if a power supply is failing you may still hear the hard drives spin or
    see the initial boot up screens on your monitor. You may also hear the fan
    in the power supply even if it is unable to power up the computer.
    Unfortunately unless you have another power supply available to plug in to
    the motherboard and hard drives there is no simple way to exclude the power
    supply as the cause of your problem.
    "Jill" <> wrote in message
    news:yyzyidlnusv9$.182m6o6ls9rd$...
    > Anyone know of an easy way to check the power supply on a W98 machine? Is
    > it possible that It (the power supply) is bad and the PS still runs? The
    > machine quit booting.
     
    bmoag, Sep 2, 2006
    #2
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  3. Jill

    w_tom Guest

    Jill wrote:
    > Anyone know of an easy way to check the power supply on a W98 machine? Is
    > it possible that It (the power supply) is bad and the PS still runs? The
    > machine quit booting.


    Yes it is possible to have a defective supply and computer still
    runs. Especially runs but has intermittent and strange problems. To
    check a power supply takes a screw driver, a 3.5 digit multimeter and
    about two minutes. Others would have you spend big bucks and much more
    time swapping parts.

    First, a power supply 'system' is more than just a power supply.
    Begin with computer off but connected to AC mains. The voltmeter
    starts by measuing voltage on purple (to any black) wires that connect
    power supply to motherboard. Value is important. That number should
    be above 4.87 volts. Then move on to voltages on green and gray wires.
    Initially those voltages would be well above 2 volts and near zero.
    Then as power swtich is pressed, green drops immediately to less than
    0.8; gray later rises to above 2.4 volts.

    Reporting these values as good is not enough. Information posted
    here will result in better replies which is why numbers, instead,
    should be reported.

    Then move on to voltages on red, orange, and yellow wires - and how
    those voltages change as power switch is pressed.

    This well used procedure (that dates to times long before PCs
    existed) with additional information has been posted repeatedly
    including in microsoft.public.windowsxp.general on 7 Jun 2006
    entitled "Dead computer" or at
    http://tinyurl.com/qcvuq
     
    w_tom, Sep 2, 2006
    #3
  4. Jill

    Guest

    Jill wrote:
    > Anyone know of an easy way to check the power supply on a W98 machine? Is
    > it possible that It (the power supply) is bad and the PS still runs? The
    > machine quit booting.

    chagne PSU..

    For further testing, backprobing with a multimeter, as described by
    scott mueller somewhere in his book UGRP
     
    , Sep 24, 2006
    #4
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