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Thread: [help] PC won't shutdown

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    Quote Originally Posted by kaskuser3d View Post
    this is the pc health from the bios :
    Attachment 3753
    isn't it normal ?
    Your PSU does not have a PMBUS channel to communicate its voltages to the motherboard. So how do you think your motherboard and CPUID are getting that information?

    That's why most people will tell you those readings are bullshit.... good or bad.

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    The mother board must have its own sensors; they may be terrible, but it can't just make up numbers.

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    Quote Originally Posted by ashiekh View Post
    The mother board must have its own sensors; they may be terrible, but it can't just make up numbers.
    It does. Of course. The board has either a Winbond or ITE H/W monitoring IC.

    I'm being intentionally obtuse. It's ridiculous to assume that a 15 cent IC located on the motherboard gathering data from random locations is going to be anywhere as accurate as getting voltages directly from the PSU.
    Last edited by Jon Gerow; 06-06-2019 at 04:41 PM.

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    Quote Originally Posted by Jon Gerow View Post
    I'm being intentionally obtuse.

    One week suspension!

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    Quote Originally Posted by ashiekh View Post
    The mother board must have its own sensors; they may be terrible, but it can't just make up numbers.
    The problem is that the IC present on the board for taking the measurements is in no way accurate, nor is it located anywhere near the power source. Generally it's located across the board somewhere between the CPU Socket and first PCIe slot or back by the rear I/O section. This introduces a ton of interference as well as natural vdroop.

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    If only he had a digital multi-meter, he could also test the BIOS battery.
    Attached Images Attached Images

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    Quote Originally Posted by ashiekh View Post
    Have you changed the BIOS battery in the 9 years?
    i did it once, several years ago, i cannot remember exactly when.
    by the way, how does bios battery affect the shutdown issue, i don't understand, could you please explain it ?

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    http://computertooslow.com/cmos-batt...e-symptoms.asp

    "
    The computer occasionally turns off or refuses to start
    "


    Can't say I can explain the consequences of corrupt CMOS
    Last edited by ashiekh; 06-07-2019 at 10:45 AM.

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    Quote Originally Posted by Jon Gerow View Post
    Your PSU does not have a PMBUS channel to communicate its voltages to the motherboard. So how do you think your motherboard and CPUID are getting that information?

    That's why most people will tell you those readings are bullshit.... good or bad.
    thanks for the explanation. i really have no idea about computer hardware.

    Quote Originally Posted by ashiekh View Post
    If only he had a digital multi-meter, he could also test the BIOS battery.
    yes i will purchase it soon.

    Quote Originally Posted by ashiekh View Post
    http://computertooslow.com/cmos-batt...e-symptoms.asp

    "
    The computer occasionally turns off or refuses to start
    "
    no. that is not the symptoms. the computer never turns off occasionally nor refuses to start.
    the issue with the PC is when i shutdown (from windows Start menu, or from linux command), most of the time it will restart/reboot, instead of shut down.
    but yesterday i did shut it down successfully. so it is random, which confuses me.

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    That is why philosophizing is not nearly so effective as collecting data

    * checking the power supply voltages (with a DMM) and checking the BIOS battery voltage
    * updating the BIOS
    * Testing the RAM
    * look for distressed capacitors on the mother board and in the power supply

    etc

    Checking the battery voltage takes less time than wondering what effect it could have.

    Even better is if one has a spare power supply around and can try that; so much time saved.
    Last edited by ashiekh; 06-07-2019 at 10:27 PM.

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