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    W330 bios settings revert to default, uefi disabled, possibly cmos related

    Discussion in 'Sager and Clevo' started by Sir Punk, Aug 5, 2018.

  1. Sir Punk

    Sir Punk Notebook Deity

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    My friend Marion, a cute french lady (maybe if I could fix her laptop...), has a Clevo W330su2, she has been having problems with the bios setting going back to the default when the main battery dies, but this behavior is not consistent.

    I have changed the CMOS battery two times and there is still this problem, it's difficult to troubleshoot. CMOS battery is supposed to last at least a few years but these batteries, brand new and of good quality brand (energizer), seem not be working and allow saving the bios settings. So at every boot she has to enter the bios and change the UEFI setting to enable because the default is disabled. After this the clock is always out of date, which shows that the cmos battery is not working properly. I have read that quick discharge of CMOS battery might be due to a faulty board.

    TL,DR - two main problems
    - why does the cmos battery discharge so quickly or why bios settings are not stored?
    - is there a way to flash the bios so uefi boot is enabled by default? She has the latest bios 1.03.03
     
    Sir Punk, Aug 5, 2018
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  2. Chastity

    Chastity Company Representative

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    Check the CMOS battery socket is making proper contact with the battery. Check for corrosion, if found, clean it.
     
    Chastity, Aug 5, 2018
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  3. Sir Punk

    Sir Punk Notebook Deity

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    Definitely did that, there was no sign of corrosion and I can see the battery is touching properly the contacts.
     
    Sir Punk, Aug 5, 2018
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  4. Chastity

    Chastity Company Representative

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    Does the CMOS reset if the CMOS battery is fresh, and the laptop battery is removed?
     
    Chastity, Aug 5, 2018
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  5. Sir Punk

    Sir Punk Notebook Deity

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    it's inconsistent. But I can tell for sure that I did change the battery and didn't have a problem for a couple weeks. Then I went on vacation for 3 weeks and when I can back the BIOS settings were lost. The battery should not go dead in 3 weeks.
     
    Sir Punk, Aug 6, 2018
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  6. Meaker@Sager

    Meaker@Sager Company Representative

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    The battery normally lasts several years.
     
    Meaker@Sager, Aug 6, 2018
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  7. Chastity

    Chastity Company Representative

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    The point I am making is that I am trying to see what is shorting in your system to drain the CMOS battery so fast. If you disconnect the main battery, and run off AC power only, and let it sit for a month, does it still drain the CMOS battery?
     
    Chastity, Aug 6, 2018
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  8. Sir Punk

    Sir Punk Notebook Deity

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    I appreciate the advice but I am trying to understand what this test will tell you. If you have or not have the main battery in the end the main battery will be dead after a few weeks. Do you think the CMOS battery drains faster when the main battery is in? I can't really have this laptop sitting for a month, I wish I was always on vacation! :)
     
    Sir Punk, Aug 8, 2018
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  9. Chastity

    Chastity Company Representative

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    I wanted to see if the battery is shorted internally, and causing a drain.
     
    Chastity, Aug 8, 2018
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