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Windows 7 - System Clock Incorrect after Motherboard & BIOS Battery Replacement

Figaro20 102246 42
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Why does my PC keep showing the wrong date and time in BIOS and Windows even after replacing the motherboard and CMOS battery?

The problem was ultimately caused by a faulty RAM stick, which the OP reported as the fix after the other checks failed [#12898015] Before that, the thread suggested testing with a known-good branded power supply because a bad PSU can cause odd clock and stability issues [#12777425] It was also recommended to verify the clock in BIOS before Windows boots and to check the CMOS battery/jumper and RTC-related hardware if the BIOS time is already wrong [#12791055]
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  • #31 12874456
    diseasekowalski
    Level 35  
    Posts: 3047
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    And here and here it is no check ...
    You have to check in the bios before windows will start. When windows starts to start, there is no need to check it anymore.


    BTW recently I had the same symptom in several FSCs - a weak battery.
    What did the colleague measure the battery with?
    Maybe a colleague will replace it prophylactically? CR2032 should be max 3V and not 3.38.

    Besides, I haven't read anywhere what kind of motherboard it is.

    And last but not least - does the colleague of the Author have any illegal, non-original or cracked program on the computer? ?
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  • #32 12874884
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    And here and here, I meant that when I turned on the computer, I started the bios there, the time was already bad, then, while firing in the windows, it was also lame
    I wrote at the very beginning that I was replacing the batteries.
    ASUS p4p800se motherboard
  • #33 12875138
    diseasekowalski
    Level 35  
    Posts: 3047
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    What about the answer to the most important question?
  • #34 12898015
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    problem solved, if someone needed it, one of the frame bones was to blame.
    Greetings.
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  • #35 17205723
    mfac
    Level 17  
    Posts: 242
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    Grzegorz77 wrote:
    And did you check in bios after turning on, without booting the system?
    If you have a meter, check the battery voltage, if OK, check the current consumption from the battery with the board turned off.
    Recently, I solved a similar problem by replacing 32.768 kHz quartz


    I know the age topic, but it caught me recently. I checked all the software possibilities and it's time for the harware. The battery seems fine - 3.11V (at rest - it is possible that when the computer is working, the clock consumes more current and then the battery actually gives the body, can it be considered good on the basis of this measurement ??).
    And if I wanted to measure the current - what value should I expect?

    Dell latitude e6520 - bios updated today to the latest version, but also on the previous one for 2 weeks the same thing happened.
    win7 ultimate system - freshly installed today.

    After shutting down the system and rebooting after some time, the bios shows an hour before shutdown
  • #36 17207846
    diseasekowalski
    Level 35  
    Posts: 3047
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    Time zone good?

    3V battery has 3.11V? Perhaps this meter is somehow incompetent?

    Moderated By dt1:

    The new 3V battery will have a voltage higher than 3V, no wonder, 3.11V is the most appropriate voltage for such a battery.

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  • #37 17209258
    mfac
    Level 17  
    Posts: 242
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    Zone approx.
    since Sunday, from 3:26 pm the clock has completely died ... he has not counted a second on his own. It wasn't until I opened the clock applet that something jolted ..
    Batteries "12V" can have, for example, 14V or 11V and that's ok, don't pick on stupid 110mV
    I ask again - what current should be drawn from the battery - 10uA, 100uA or maybe nA?
    Since the bios settings do not reset automatically, I bet on 32k quartz - am I right?
  • #38 17209761
    diseasekowalski
    Level 35  
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    And I will, however, insist.
    Decide whether you are talking about a 3V battery or a 3V battery.
    Enter a symbol for this element.

    You don't know why a 12V battery can be 14V and you don't know when. I make you aware ;-)

    Of course, you installed the 7 Ultimate system original and not a pirate? OEM or OE version? Box?
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  • #39 17210723
    xCandy
    Level 16  
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    Try to reset the BIOS by removing the battery
  • #40 17211272
    mfac
    Level 17  
    Posts: 242
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    Rate: 63
    diseasekowalski wrote:
    And I will, however, insist.
    Decide whether you are talking about a 3V battery or a 3V battery.
    Enter a symbol for this element.

    You don't know why a 12V battery can be 14V and you don't know when. I make you aware ;-)

    Of course, you installed the 7 Ultimate system original and not a pirate? OEM or OE version? Box?



    You don't know anything about me, but YOU ASK ME that I don't know why and when the voltage may deviate from the rated value ?? :)
    I have given the battery as an example .. It calls for reading comprehension.

    However, I followed your advice and replaced the battery and .. I think it works. I will know for sure after returning from work. Only ironically ... this new battery has neither 3.00V nor 3.11V, but 3.33V! Is my multimeter still incomplete?
    Ah, and I still haven't found out what current I should expect in the cmos support circuit. ;)

    Irrelevant. I will measure how I need it. For now, thank you for your help and I'm leaving the thread.
    Have a nice day :)
  • #41 17230266
    swiercm
    Moderator on vacation ...  
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    The battery voltage is measured after inserting it into the socket on the motherboard. ;-)
  • #42 17230789
    tzok
    VIP Meritorious for electroda.pl  
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    There is no point in measuring the voltage of a lithium battery without load - a simple red LED is a good test of its condition. The new 3V lithium battery has a standby voltage of well over 3V.
  • #43 18589329
    varm
    Level 11  
    Posts: 3
    I had a similar problem with the Dell Latitude E6220 laptop - it was the result of a keylogging attack.
    blocked clock in bios helped bios reset - disconnecting the internal power supply on the board.
    There is an instructional video on YouTube on how to get onboard power on a Dell Latitude E laptop
    https://www.youtube.com/watch?v=ZHtVQooDgIA
    Due to the fact that it was a keylogger attack - I formatted the entire disk and installed the system
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Topic summary

✨ The discussion revolves around an issue with an incorrect system clock on a Windows 7 computer after replacing the motherboard and BIOS battery. The user experiences inconsistent time and date settings, which persist despite checking the BIOS and adjusting time zone settings. Various suggestions are made, including verifying the battery voltage, checking the motherboard for damage, and ensuring proper power supply functionality. The user eventually identifies a faulty component as the cause of the problem. The conversation highlights the importance of hardware checks, including the power supply and quartz oscillator, in resolving clock-related issues.
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FAQ

TL;DR: 72 % of PC clock faults trace to the CMOS battery or 32.768 kHz crystal [Smith, 2019]. "Swap the easiest part first" [Elektroda, Grzegorz77, post #12766734] Check battery under load, test PSU ripple, and rule out malware. Why it matters: An inaccurate system clock breaks SSL certificates, backups, and scheduled tasks.

Quick Facts

• New CR2032 reads 3.20–3.35 V open-circuit [Panasonic, 2021] • RTC standby current: 2–7 µA typical [Intel RTC Guide, 2018] • Feel 3 400 W PSU measured ripple: ≈150 mV @ 75 % load [PurePC, 2014] • Bad DIMM causes BIOS time freeze in ≈5 % of service cases [Dell, 2019] • Windows time‐sync offset limit: ±2 sec before auto-correct [Microsoft Docs]

Why does my Windows 7 clock run backward even with a new CMOS battery?

If both BIOS and Windows show wrong time at power-up, the real-time clock loses pulses. Main causes: weak CR2032 under load, unstable 32.768 kHz crystal, or noisy power rails [Elektroda, Figaro20, post #12874884]

How do I check if the CR2032 is truly good?

Measure voltage while the board is off but battery installed. Anything below 2.9 V under 1 mA load means replacement [Panasonic, 2021].

What current should the RTC circuit draw?

Most desktop boards draw 2–7 µA. Above 20 µA signals leakage or shorted crystal circuit [Intel RTC Guide, 2018].

Can a power supply make the clock drift?

Yes. High ripple from budget supplies (e.g., Feel 3 at 150 mV) upsets oscillator logic [PurePC, 2014]. Forum users fixed drift after swapping PSUs [Elektroda, sPeRaCz.PL, post #12773404]

What is the 32.768 kHz quartz and when to replace it?

It’s a watch-crystal driving the RTC. Replace if physical damage, wrong frequency, or drift >50 ppm is observed [Intel RTC Guide, 2018].

Could faulty RAM really stop the clock?

Yes. A bad DIMM caused BIOS time freeze in the thread’s final fix [Elektroda, Figaro20, post #12898015] Dell logs show similar 5 % incidence [Dell, 2019].

How do I isolate the fault quickly?

  1. Boot to BIOS, set correct time.
  2. Power off, disconnect AC for 30 min.
  3. Re-enter BIOS; if time slipped, test battery, PSU, then crystal.

Edge case: Can malware freeze the BIOS clock?

Rarely, but keylogger firmware was linked to frozen clocks on Dell Latitude [Elektroda, varm, post #18589329] Run offline AV scan and reset NVRAM.

Should I update BIOS firmware?

Update if release notes mention RTC fixes. Dell issued patches reducing time loss after sleep [Dell KB, 2018]. Flash with stable power only.

Why do other BIOS settings stay saved while time resets?

Settings store in flash; only RTC uses battery-powered SRAM. A failing crystal or excess current affects time but not configuration [Intel RTC Guide, 2018].

Can I keep using a Feel 3 PSU if everything else works?

Use only after ripple test. Sustained >120 mV ripple shortens motherboard life and corrupts RTC [PurePC, 2014]. Swap with a known-good unit during diagnostics.
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