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

Figaro20 102240 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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  • #1 12766407
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    Hello.
    for some time I have so that what turns on the computer is the wrong time ...
    I think it is the fault of the system because recently I had to replace the motherboard and the new one is the same, I also replaced the batteries from the BIOS, I scanned the computer for viruses ... Any suggestions?
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  • #2 12766434
    sPeRaCz.PL
    Level 42  
    Posts: 8573
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    If you are sure about the battery, maybe it is a matter of the time zone in the system? It should be GMT + 01:00
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  • #3 12766446
    Grzegorz77
    Level 25  
    Posts: 589
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    Is the change constant, e.g. by a multiple of hours?
    Or rather accidental? What about the date?
  • #4 12766672
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    today, when I turned on the computer, it was yesterday's date, there is no rule as to the hours ...
  • #5 12766718
    diseasekowalski
    Level 35  
    Posts: 3047
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    A colleague checked this time zone as it was advised or not?
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  • #6 12766734
    Grzegorz77
    Level 25  
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    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
  • #7 12766842
    sosarek

    Level 43  
    Posts: 83875
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    Right-click on the clock in the Taskbar -> Set date / time -> Internet time -> Change settings -> Disable Synchronize with an Internet time server.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
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  • #8 12766948
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    no, I did not check the time in the bios itself, but I will check, the battery shows 3.38V, as I wrote earlier, it is rather not a record because the previous one was the same, I turned off the synchronization, we will see tomorrow if it did something :)
  • #9 12768478
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    the time zone is correct, turning off the Internet time did not help,
    today, after turning on the computer and in the BIOS and in windows, the date and time are wrong ..
    I remember that I also had such a problem on windows xp and the solution was very simple.
  • #10 12769639
    Grzegorz77
    Level 25  
    Posts: 589
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    did you check in Bios before starting the system?
  • #11 12770385
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    Grzegorz77 wrote:
    did you check in Bios before starting the system?


    Exactly...
  • #12 12770499
    Deo60
    Level 2  
    Posts: 3
    Rate: 2
    You probably have damage to your motherboard, quartz or capacitor. check visually if they are swollen (there may also be capacitors blown up from below and not visible from above).
  • #13 12770751
    Figaro20
    Level 10  
    Posts: 61
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    NO I do not know because before it was the same and after the AGP slot burned down I bought a new album .... And by the way, when you write "quartz" what do you mean?
  • #14 12770817
    swiercm
    Moderator on vacation ...  
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    What kind of power supply do you have in this computer?
  • #15 12770825
    Deo60
    Level 2  
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    On the motherboard there is a quartz for the frequency generator for the system bus, if it is unstable, the operation time is different from the reality. I met a computer where time was going backwards.
  • #16 12770834
    swiercm
    Moderator on vacation ...  
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    Deo60 wrote:
    On the motherboard there is a quartz for the frequency generator for the system bus, if it is unstable, the operation time is different from the reality. I met a computer where time was going backwards.


    And I have encountered cases where the pseudo-power supply caused, apart from other problems, just indicated by the author. It was a 400W ProComp - very unsuccessful, even for a pseudo-power supply.

    I suspect that this is it, since the author had to change the motherboard.

    Author - it would be appropriate to provide the full specification of the PC with the power supply here.
  • #17 12770867
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    ModeCom Feel 3 400W power supply
  • #18 12773170
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    I will add that even when the computer is normally turned on, the time is still changing, but always backward, never forward ...
  • #19 12773404
    sPeRaCz.PL
    Level 42  
    Posts: 8573
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    Figaro20 wrote:
    ModeCom Feel 3 400W power supply


    OMG! Fell ...

    My friend. Substitute another branded power supply and test.
  • #20 12773644
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    No exaggeration, I will not buy a power supply that is more expensive than the rest of the equipment, besides Feel 3 has no such bad reviews ..
  • #21 12773853
    diseasekowalski
    Level 35  
    Posts: 3047
    Help: 180
    Rate: 189
    What about the full specs of the computer?
    What about checking the time in bios BEFORE booting the system?
  • #22 12777176
    zbys82
    Level 9  
    Posts: 18
    Rate: 2
    Hello

    I had a similar problem once, a simple replacement of the Bios battery helped.
    and when did you exchange yours?
  • #23 12777216
    kasiunia7777
    Level 39  
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    Yesterday I had a laptop with a Chinese crap universal power supply in my hands, on which various voltages were set, it was set a bit too high and the time, the date went crazy. She withdrew as much as she wanted. I switched to the correct voltage and the problem was gone. The fear of using such shit ... but it was not mine :D

    Substitute another power supply and see what is happening.

    Added after 2 [minutes]:

    Figaro20 wrote:
    NO I do not know because it was the same before and after the AGP slot burned down, I bought a new album

    On a working power supply, such things do not happen with the motherboard. If you want to say goodbye and with a new one in some time, please keep working on feel3

    Added after 7 [minutes]:

    Since you are doing it on both motherboards, I give 99% that the power supply is to blame here.
  • #24 12777425
    sPeRaCz.PL
    Level 42  
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    Figaro20 wrote:
    besides, Feel 3 doesn't have such bad reviews ..


    I saw with my own eyes, and actually serviced the computer, which restarted itself once every 2 hours (there were 12 restarts for 24 hours of work). I searched for the reasons for a long time, I prophylactically replaced the Tagan power supply (it was Feel 3) and the problem disappeared after a few days of testing.

    sPeRaCz.PL wrote:
    My friend. Substitute another branded power supply and test.


    Nobody ordered to buy another one, only to borrow, for example, from a colleague during the tests. You will find out for yourself about the culprit.

    Figaro20 wrote:
    when the computer is normally turned on, the time changes anyway, but always backward, never forward ...


    That is why I personally suggest a power supply - it has already got you a motherboard once.
  • #25 12777582
    swiercm
    Moderator on vacation ...  
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    Feel 3 is not the last one, but one - it has to be relatively new, two - functional, three - periodically maintained (like any power supply).

    The brand itself means nothing if tons of dust accumulate inside and you don't peer into it for years. In such conditions, even branded power supplies crash - the capacitors dry up and the whole thing loses its properties.

    Swap the Author at least for the PSU day and we will eliminate him.
    Can you give a picture of the nameplate of this Feel 3? I will judge if the lines are strong enough to pull your gear.
  • #26 12791055
    Grzegorz77
    Level 25  
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    Deo60 wrote:
    On the motherboard there is a quartz for the frequency generator for the system bus, if it is unstable, the operation time is different from the reality. I met a computer where time was going backwards.

    In a PC, the real-time clock has its own quartz, independent of the system clock, moreover, the clock circuit is powered by the battery, and it works even with a disconnected power supply, so its influence on the operation of the clock is rather small.
    But as an experiment, I suggest you disconnect the power supply and check after some time the clock will change.
    Check if the CLR cmos jumper is in the right position, and if it is at all
  • #27 12872593
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    I changed the power supply yesterday, while working on the computer on the computer, the clock changed about an hour after the working hour, updated the time and immediately after that at 22.25 I turned off the computer today I turn it on and yesterday's date and time is 22.27 ...
  • #28 12873184
    swiercm
    Moderator on vacation ...  
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    How about the rest of the BIOS settings? Are they saved or are the settings also reverted to the fail-safe state?
  • #29 12873492
    diseasekowalski
    Level 35  
    Posts: 3047
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    Checked before starting the system? Is it already in the system?
  • #30 12873682
    Figaro20
    Level 10  
    Posts: 61
    Rate: 22
    swiercm wrote:
    How about the rest of the BIOS settings? Are they saved or are the settings also reverted to the fail-safe state?


    The other settings are ok.


    diseasekowalski ... Here and here ....
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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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