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Thread: [help] PC won't shutdown

  1. #21
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    hello everybody, i just purchased a digital multimeter and tested the PSU. attached is the test result.
    is it normal ?
    Attachment 3774

  2. #22
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    Invalid Attachment specified.

    Can you just type in the results?

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    oh thanks for informing, it is seen normal from here.

    here it is :
    1 3.44V
    2 3.44V
    3 -
    4 5.24V
    5 -
    6 5.25V
    7 -
    8 -
    9 5.13V
    10 12.36V
    11 12.35V
    12 3.43V
    13 3.43V
    14 -12.02V
    15 -
    16 -
    17 -
    18 -
    19 -
    20 -
    21 5.24V
    22 5.24V
    23 5.24V
    24 -

    i also tested the old CMOS battery, and the voltage is only 2.8V (normally 3V).

  4. #24
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    • +5 should be +4.75 V to +5.25
    • −5 should be −4.50 V to −5.50
    • +12 should be +11.40 V to +12.60
    • −12 should be −10.80 V to −13.20
    • +3.3 should be +3.135 V to +3.465
    • +5 should be +4.75 V to +5.25


    So your power supply voltages are fine, but the CMOS battery needs changing

    What digital voltmeter did you get?

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    thanks again, i just changed the CMOS battery and will re-plug the PSU and try using the computer again.
    is there any other component that is possibly broken ?

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    Quote Originally Posted by kaskuser3d View Post
    is there any other component that is possibly broken ?

    Of course... that is why one tries to figure out what the problem is.

    Did you check for a BIOS update, test the RAM, check for swollen capacitors etc
    as suggested on page 1 a week ago? (and again on page 2)
    Last edited by ashiekh; 06-15-2019 at 11:28 AM.

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    Quote Originally Posted by ashiekh View Post
    Of course... that is why one tries to figure out what the problem is.

    Did you check for a BIOS update, test the RAM, check for swollen capacitors etc
    as suggested on page 1 a week ago? (and again on page 2)
    - for bios update, i cannot find any update on this bios. but i don't understand how it relates to my issue.
    - for ram test and swollen capacitors, i will check them tomorrow, this is already at night and the room is too dark.

    thanks again.

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    Hopefully the new BIOS battery is all it needed.
    Last edited by ashiekh; 06-15-2019 at 04:37 PM.

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    i checked and didn't find swollen capacitors.
    i also replaced the cmos battery, but the shutdown issue persists.

    here is the PSU voltage test using a multimeter :


    and here is the psu tester result. the only unlit indicator LED is -5V :

  10. #30
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    -5V is obsolete and not found on modern power supplies; to quote Scott Muller's Upgrading and Repairing PCs

    "-5V was removed from the ATX12V 1.3 and later specifications."


    https://en.wikipedia.org/wiki/ATX#ATX12V_1.x

    "Guidance for the −5 V rail was removed (but it was not prohibited)."


    Did you look at the capacitors in the power supply or try another supply?
    Last edited by ashiekh; 06-23-2019 at 02:16 PM.

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