cmos battery

By loriomal ·
Hi there
I've just taken apart an acer aspire 5100 as i need to clear the bios password. My problem is that i can not figure out where the cmos is located
I would appreciate any help thanking you

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Service manual here...

Though you will have to buy it, but at least you will have it for future reference.

Please post back if you have any more problems or questions.
If this information is useful, please mark as helpful. Thanks.

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Battery removal will not remove BIOS password ...

by OldER Mycroft In reply to cmos battery

So if you're still banging on about the same laptop as in your other post, you are wasting your time.

All you will achieve is the re-set of a few BIOS settings back to factory state, but the password will still prevent you going in there your self.

If there is a boot password, it'll still be there after you've knife&forked your way around the motherboard.

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CMOS or more correctly BIOS is a piece of

by OH Smeg Moderator In reply to cmos battery

Firmware held in a Composite Metal Oxide Semiconductor Integrated Circuit. It is generally a 1/4 inch square IC soldered onto the M'Board but it may vary in size owing to the fact that it may be a Surface Mount IC.

If you are trying to ask where the Battery for the RTC is that is simple there isn't one as RTC Batteries have not been used in NB's for a very long time. They are unreliable and cause problems with NB's that cost the makers money so they have been replaced with what is called Smart Socket Technology.

This comprises a Rechargeable Battery type device on the M'Board which provides the power required to run the RTC but it in now way Powers the CMOS Chip to save the BIOS Settings.

To remove any BIOS Password on a modern NB you need to return the NB to a Authorized Service Center for that make NB and they will Clear the BIOS Password but may also delete any Encryption Keys that are included to prevent unauthorized people reading data stored on the HDD and this included any Recovery Partition that may be included on the HDD.

You need to reload most modern NB's after clearing the BIOS.


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