Question about Dell Latitude C640 Notebook

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Dell C640 bios (cmos) battery

How can I replace teh bios battery. What must I unscrew?

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Disconnect the adaptor, and remove the battery.

Turn over your latop........ all the screw locations marked with a "K" are for securing the keyboard. Once they are removed the keyboard can be moved by rotating toward you.

The CMOS battery is located in it's own little depression under the keyboard.

It's basically six watch batteries in a series covered by shrink wrap........ mine was green.

Under 5 bucks from China via eBay (it was green too).

It has a two pin connector with the red and black wires........ no brainer to replace. The connector is keyed to only go in easily one way.

But like pip433x said........ it's in the manual with pretty pictures.

Posted on Jul 06, 2010

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Http://support.dell.com/support/edocs/systems/latc640/sm_en/index.htm


This is the Link for your service manual. It will show you exactly what to unscrew. This is your tear down manual for your computer. Please vote me a 10 when this works for you

Posted on May 26, 2010

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remove the cmos battery from motherboard once and then start.

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You will have to do a hard cmos clearing which will load your bios back to it default value. 99% of the time if will clear the password. In order to do this, you may have to tear your laptop apart just to get to the cmos battery which is located on your laptop motherboard somewhere. Once you located your cmos battery which is silver/nickel size of a nickel, you need to take this battery out for a few minute and then reinstall it back, then put your laptop toghter and then it will clear the bios and reload to it's default setting.

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The battery has a dry cell causing this so replace the battery

Jun 20, 2010 | Dell Latitude C640 Notebook

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Bios locked out


If you know how to dissemble your computer and are comfortable with it, open it and remove the CMOS battery, wait about 10 minutes, put it back and turn on your machine. All BIOS settings should have been restores to factory defaults, including passwords. Hope this is helpful.

May 16, 2010 | Dell Latitude D600 Notebook

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Cannot boot .


Try this. Please make sure that when you installed your CMOS battery, that you did it correctly.

Here are instructions: http://www.smartcomputing.com/Editorial/article.asp?article=articles/2004/w1510/32w10/32w10.asp

Now, if all was correct then go into the BIOS and configure your hard drive because it sounds like your hard disk isn't configured.

Most BIOS's will auto recognize the hard drive but you have to go into the BIOS and tell it to search for it and then save it by pressing F10 and save before you exit out of your BIOS.

If all else fails, replace your hard disk.

Don't forget to rate me and vote for me, thanks. Also let me know how it goes.

Mar 24, 2010 | Dell Latitude C640 Notebook

1 Answer

I changed my Cmos battery & my laptop would not start after tha


Without battery, BIOS just gets reset to default and should not effect boot. There is a possibility that you failed to reconnect something important when disassembling the unit.

What exactly happens when the unit turns on?

Jun 18, 2009 | Dell Latitude C640 Notebook

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Dell latitude laptop f1 error message


i think your cmos cell is not working properly.
refix it or replace it.
it is back side of laptop,

Jan 01, 2009 | Dell Latitude C640 Notebook

2 Answers

LOST PASSWORD


It looks like Dell is pretty tight with this info. They want you to contact their tech support in one of these ways:

http://support.dell.com/support/topics/global.aspx/support/dellcare/contact_technical_support?c=us&l=en&s=gen

Before doing that though, I'd remove all power, unplug the CMOS battery and let it sit for a while before hooking the battery back up, applying power and see what happens.

Dec 30, 2008 | Dell Latitude C640 Notebook

1 Answer

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clear the cmos, or remove the battery for a few minutes, that will clear any bios password

regards

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1 Answer

Location of CMOS Battery


The C-mos is green about a half inch wide and three inches long with two wires leading to a connector, and is generally located under the memory cover on the bottom of the machine. However, with this machine, it may be located under the bottom plastic cover in order to make room for the wireless card. It will be very close to the wireless card and memory.

Jul 04, 2008 | Dell Latitude C640 Notebook

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