AMD Motherboards - X470D4U shows 0v on CMOS battery

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X470D4U shows 0v on CMOS battery

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=16870
Printed Date: 13 Aug 2025 at 7:04pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: X470D4U shows 0v on CMOS battery

Posted By: helixzz
Subject: X470D4U shows 0v on CMOS battery
Date Posted: 08 Oct 2020 at 9:39pm

I have a ASRock Rack X470D4U motherboard, with Ryzen 3600X processor, 8 GiB UDIMM.

Strangely, the BMC reports CMOS battery voltage is 0v, and issues an alert (of course).

Tried:
- Upgrade BIOS (3.30, L3.37)
- Upgrade BMC F/W (01.90.00, 02.05.00)
- Replace CMOS battery with new one

Well, none of them worked out.

P.S. I have a digital multimeter so I can confirm the actual battery voltage is normal (around 3V).

Replies:

Posted By: helixzz
Date Posted: 18 Oct 2020 at 2:16pm

Update: After few days (continuously running), the reported voltage came back to normal. I did nothing at all.
Strange issue.