Question about Dell Latitude C640 Notebook

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Location of CMOS Battery

I couldn't find the cmos battery although I unscrewed everything. Where is it located. Please help?

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  • jimmik742 Jul 27, 2008

    where is the cmos battery

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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.

Posted on Jul 07, 2008

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Location of cmos battery


These are the most basic signs your CMOS battery is going dead and will be your ultimate test of the battery
http://www.bing.com/images/search?q=cmos+battery+images&qpvt=cmos+battery+images&FORM=IGRE Bios setting are saved in cmos batteries
make cmos battery has charge and is not loose
cmos battery images
http://www.bing.com/images/search?q=cmos+battery+images&qpvt=cmos+battery+images&FORM=IGRE


How to replace the CMOS battery in your laptop http://www.youtube.com/watch?v=MTg8qhWKNpA

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If you're up to it, then try these simple steps:

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- Check if the keyboard is being held by 2 screws. To loosen them, remove the battery and unscrew them from inside the battery bay.

- Carefully lift the keyboard in an angled position and check the ribbon or contact tape that connects the keyboard to the motherboard. Flip the keyboard towards you and see if you can reach the CMOS battery (usually covered by a blue plastic shield or protective cover. There's a pair of wire coming from it and the end is a small connector. You may remove the connector attached to the motherboard carefully to get the CMOS battery.

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On motherbord you find cmos cell .

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So wait, its asking for a BIOS/CMOS password? If so, one thing you can try to do is remove the CMOS battery. The battery is about the size of a nickel and can be found on the bottom of your laptop. You'll have to unscrew a few things to find it. Once you do, take extreme precaution when touching anything inside the computer. I would recommend getting an Anti-Static Wrist strap (sold at Best Buy). Once you locate the CMOS battery, take it out. Keep it out for about a minute and then put it back in and close everything back up. When you do this it usually resets the BIOS/CMOS password if there is one. Hope this helps!

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1 Answer

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Hi!Checkout the image..Its circled in red thats where you will find it..As for getting apart refer you manual..It is just unscrewing and pulling out to remove the plastic cover..
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