Bios cmos error on new Nuc8i5beh

User42 · ‎10-21-2019

Hello,

I just purchased a new NUC8I5BEH and usually when I turn it off I also disconnect it from the power source. Everytime I turn in back on I see a "Cmos checksum error" and the warning message that time and date are not set during the boot up screen. In the bios setting I can see the date/time are indeed resetted every time.

What can be the problem, maybe a bad cmos battery?

I tried to reset the bios setting to default and also updated the bios to the latest but the errors are still there. If I leave the power source connected nothing strange happen and the unit work as intended.

Also I can't see the cmos battery from the side grills, maybe is enterely missing?

I don't feel confident to remove the motherboard from a new unit. If I keep it like this can I have some issue in the long term?

Thank you.

LeonWaksman · ‎10-21-2019

Your description clearly indicates CMOS battery failure. Since the battery in your NUC is installed on the upper (invisible) board side, the board have to be removed in order to replace it.
Removing board, requires some technical skills. On this video you may get idea how it should be done https://www.youtube.com/watch?v=Tn5cM0c7LpQ . Although it is NUC7i5BNH , however, for your NUC it will be very similar process. Additional information see here https://www.intel.com/content/www/us/en/support/articles/000006787/mini-pcs.html
In my opinion this battery should be replaced. In long term, working with weak battery, may course boot problems.
Since you don't feel confident to remove the motherboard , you may check possibility to replace your NUC ias a warranty service https://supporttickets.intel.com/warrantyinfo?lang=en-US

Leon

User42 · ‎11-01-2019

Thanks for the reply!

Eventually I removed the motherboard and found out that the BIOS battery was entirely missing!

Added one taken from an old laptop and now everything is working fine.

LeonWaksman · ‎11-01-2019

You may buy a new battery on net. This is only an example: https://www.amazon.com/dp/B005KOKAJ2/ref=dp_cerb_1

Leon