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Windows 7: BIOS time and date reset after boot OS.

05 Oct 2013   #1

Windows 7
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 System SpecsSystem Spec
05 Oct 2013   #2

Windows 10 Pro

Change the cmos battery.

How to replace the CMOS battery.
My System SpecsSystem Spec
05 Oct 2013   #3

Windows 7 32 bit

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 System SpecsSystem Spec

05 Oct 2013   #4
Layback Bear

Windows 7 Pro. 64/SP-1

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 System SpecsSystem Spec
06 Oct 2013   #5

Windows 7

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 System SpecsSystem Spec
06 Oct 2013   #6

Win8/8.1,Win7-U64, Vista U64, uncounted Linux distor's

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 System SpecsSystem Spec

 BIOS time and date reset after boot OS.

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