BIOS time and date reset after boot OS.


  1. Posts : 2
    Windows 7
       #1

    BIOS time and date reset after boot OS.


    I have notebook HP Pavilion dv6 2020ev Corei7, and Im not able to set up correct time and date. When I set date in BIOS and start Windows 7 there is time difference (few minutes sometimes, few hours etc. but every time different). When I turn off nb (also remove battery) time in BIOS is still OK. But when I start Windows 7 there is difference. BIOS time is ok till I change time or date in Windows 7. And this is big problem, when I update time or date in Windows 7, then after new boot BIOS time and date is reset to 00:00 01/01/2009. Ive tried everything, update BIOS, fresh installation of Windows 7, change time internet sync settings, change the Hard, RAM,... after a lot of research, i decided to change the bios chip next to the "Control Keyboard chip" on motherboard ( i download last Bios version from HP, and program it), problem not solved.
    after that i changed the other BIOS chip. problem not solved again.
    finally i change the "Control Keyboard chip" (ENEKB3926QFD2) and unfortunately problem still alive.

    note: Sometimes, when I work with my notebook date and time changes it go future or past.
    i changed the battery on mother board, No effect.

    sorry for my english.

    please HeLp Me.
      My Computer


  2. Posts : 4,566
    Windows 10 Pro
       #2

    Change the cmos battery.

    How to replace the CMOS battery.
      My Computer


  3. Posts : 5,092
    Windows 7 32 bit
       #3

    If the CMOS battery change doesn't fix it, I supposed it's possible, since BIOS time is memory mapped i/o, that some privleged process with a wild pointer is writing into it. But I'd say that is a long shot.
      My Computer


  4. Posts : 25,847
    Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
       #4

    Their are infection that can cause this problem. If all else fails you could go to the Security section on this Forum.

    System Security - Windows 7 Help Forums
      My Computer


  5. Posts : 2
    Windows 7
    Thread Starter
       #5

    thank u andrew, as is saied, i changed the cmos battery on mother board first but Not effect.

    again thank u MilesAhead, i changed the I/O chip but not effect.

    ok, i will write on security section.
    thanks all.
      My Computer


  6. Posts : 1,045
    Win8/8.1,Win7-U64, Vista U64, uncounted Linux distor's
       #6

    The RTC or Real Time Clock chip on the motherboard is defective. Good info at Wiki on this. This is a small chip normally close to the battery that maintains the system time.
      My Computer


 

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