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2 Posts

02-04-2013

Albania

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Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

2013-02-04, 10:22 AM

Hello everybody,

 

Can help anyone to resolve my problem.


I have an Thinkpad W520 (42823FG), BIOS 8BET60WW 1.4        When I disconect AC power and remove battery and connect again, I see this message on screen:

"Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

Press Esc to continue or F1 to enter Setup"

 

Is this a system board problem or CMOS battery problem ?

 

Thank you

 

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8991 Posts

01-13-2008

United States of America

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  • Posts: 8991
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  • Message 2 of 2

Re: Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

2013-02-04, 15:55 PM

Hello and welcome,

 

It's probably (hopefully) just the CMOS battery.  The easiest way to find out is to just replace that battery.

 

Page 85 of the Hardware Maintenance Manual:

 

Hardware Maintenance Manual

 

Here's an example of the battery.  I'm not recommending (or not) this vendor:

 

http://www.ebay.com/itm/New-Lenovo-ThinkPad-W500-W510-W520-W530-W700-W701-W701ds-CMOS-RTC-Backup-BATTERY-/110962000589

 

Z.


The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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