My Laptop keep shutting down at exactly 30 min

By chulakorn
Jun 27, 2014
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  1. Hello, I have weird problem with my Dell Inspiron 5521

    It's shutting down itself every exactly 30min

    I believe that it is not heat issue because I send this laptop to clean up fan and replace themal silicone at cpu with Dell Authorize shop.

    ** Last temp. before shutdown is 45 Celcius **

    I have log this shutdown event with several condition and its still shut itself every exact 30 min

    With Chillpad - 30 min
    On/Off Wifi - 30 min
    No Batterry 30 min
    Power by Battery 30min
    Shutdown even in BIOS mode

    Solution I have try
    Format and install Window 7/8
    Flash Bios

    Thank you for your help!
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,684   +153

    Are the power down, sleep and hibernate settings properly set?
  3. chulakorn

    chulakorn Newcomer, in training Topic Starter

    Yes, I have set my laptop to never go sleep.

    I dnt think it is about Power setting because Its still turn off at exactly 30 min even in BIOS.

    I really mean exactly 30 min to the minute.
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,684   +153

    The CMOS battery might be bad
  5. chulakorn

    chulakorn Newcomer, in training Topic Starter

    What should I do with that cmos battery?

    Can I replace by myself or I should send this laptop to repairman?

    But last time He cant figure out what happen to my laptop........ :(

    Thank you :)
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,684   +153

    Try running the laptop with the battery removed, only using the AC power adapter...
  7. chulakorn

    chulakorn Newcomer, in training Topic Starter

    No help. Running by only AC or Battery still shutdown at exact 30 min
  8. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,684   +153

    "Should send this laptop to repairman?"... Yes
  9. supyo

    supyo Newcomer, in training Posts: 41

    Honestly, with everything you've tried its sounds like that laptop is a lemon. Its definitely a power management issue, possibly at the BIOS level. There are some viruses that can do weird stuff like that but if you've already reformatted and flashed the BIOS there is something wrong with that machine on the hardware or BIOS level.
  10. chulakorn

    chulakorn Newcomer, in training Topic Starter

    I also found that if its can stay longer than 30 min (which is 1 in 10-20 times), No more shutdown even for next 48 hrs.

    I guess that it was some routine check of BIOS at exact 30 min. but dont know why it was sometime excuse for routine check?


    The worst thing is that it happen just 3 day after my warranty expired.

    Thank you


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