CMOS checksum error, CMOS Reset (502) after battery replacement

[Aayush2k]

Hi all,

after replacing my main battery my notebook only starts once hooked to ac power. Otherwise it wont even turn on. Once it showes a cmos checksum error for a few seconds, it boots normally. After resetting cmos, the notebook runs normally and I can unplug ac power. I think the battery replacement somhow corrupted my bios. I think my model does not have a cmos battery.

I already updated to the latest bios version and resetted cmos a couple of times. Unfortunately, it did not help. Any advice what to do and why this happens? After looking on the internet, I am not the only one having this kind of problem after a battery replacement, but I couldn't find any helpful solution.

Happy about any advice :-).

[Rainbow23]

Hi @Aayush2k,

Welcome to HP Support Community. 
Thank you for posting your query, I will be glad to help you.

I see that you are getting CMOS checksum error on your OMEN By HP 15-Dc1093tx after replacing the battery.

Please follow the steps from this document to recover the BIOS. 

I hope this helps.
Have a good day.

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