CMOS checksum invalid (502) after replacement main battery

[oleg114]

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@ub6424 wrote:

Hello @oleg114 

Thanks for reporting.

Please < calibrate > your battery ...

(1) Open windows <device manager> and uninstall "Microsoft ACPI-Compliant Control Method Battery" 

- Right click on "Microsoft ACPI-Compliant Control Method Battery"

- Click "Uninstall device"

- Confirm your choice if you see a popup notification

(2) Shutdown notebook

(3) Disconnect charger

(4) Press and hold <power> button for 30 seconds

(5) Connect charger and wait until battery is fully charged ( check LED indicator )

(6) Start notebook and log in to windows and wait a few minutes

(7) Reboot notebook

(8) Please report back

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Hello! all steps done, but there is no effect. I also calibrated battery by HP Hardware diagnostics (2,5 hours) all for nothing (

[ub6424]

Hello @oleg114 

(1) Enter BIOS

- change some settings (write down or remember)

- save (bios) settings and exit

(2) Enter BIOS again

- revert changes

- save (bios) settings and exit

(3) Power off computer

(4) Disconnect power cable

(5) Power on notebook (battery only), still CMOS checksum error message ?

[oleg114]

" i updated bios to version F.71 Rev.  15.08.2022.  it installed ok, but didn't solve my problem. Error message 502 disappeared but laptop starts with the same delay at the beginning and loading with wrong time in WIN 10 (time of last shutdown moment)" - this is my message two days ago. 

Made changes in BIOS. still doesn't work perfect. If i disconnect AC power cable before shutdown or after (doesn't matter)  - next time  notebook will start with aprox 15 sec delay black screen (but there no 502 error message as before) and wrong time in Win 10.  Time counting stopped while AC power cable disconnected (((((  If AC power cable is connected before shutdown -  next time notebook starting immediately in 1-2 second i see HP logo and round indicator of loading WIn10 with correct time. 

[ub6424]

Hello @oleg114 

Do you have valid HP warranty ?

Check status:

HP support

If status (date) is wrong:

--->>> HP PCs, printers - Dispute a warranty status

Warranty valid: Contact HP Support. A HP technican should check/replace motherboard ...

Warranty expired: My options are exhausted...

Kind regards