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My P4D-66 has a dead battery, but I can not located it.

I tried replacing the CMOS chip thinking that would help, but it did not. New computers have a round battery right on the mother board. I pulled the mother board and searched it over several times. This one does not.

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Posted on Jan 02, 2017

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SOURCE: My mother board AOpen MX4LR, socket 478, dead

bad mobo or psp is bad try psp for now lock down mobo tight also losee no good

Posted on Jan 06, 2008

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SOURCE: mother board post

Yes, if replacing the cmos battery does not solve it, then maybe the power supply also is faulty.


Posted on May 03, 2008

  • 32 Answers

SOURCE: the musician who can't get in

their is a watch battery. i actually did open up that same laptop. you need to open one of the doors on the bottom (cant tell you witch one at the moment) and the watch battery is under there. you need to remove that battery (probably cr23## or something) for they say 15 mins. longer wont hurt. that battery is in there you just need to find it. it will clear the cmos.

[inspiron only!]
If you can not get this to work you can call this number (800)624-9896. that is dells tech support

they will request a service tag and express service code. which will be found on the bottom of the laptop.
if you arent the original owner you can have the registration of the laptop switced. but you will need to register as the new owner you can do this by filling out the Transfer of Ownership from Dell's web site.

i know its not quick, but it will be easy.

Good luck

Posted on Jan 12, 2009

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SOURCE: BOOT falilure after RAM installation

If your battery finally died then most likely your motherboard was cleared. you need to find the motherboard setup disk to set it up for use again. I have the same problem but the cmos clear jumper on the board was moved purposely in my case.I never thought i would erase the board just reset it. OOPS.

Posted on Jan 12, 2009

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SOURCE: HP Compaq nx9020 laptop cmos battery location on mainboard

On the motherboard,does the battery,that looks like a large capacitor.Have a serial number on it that can be matched to Compaqs operations/repair manual(s).?

Posted on Feb 15, 2010

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1 Answer

Schematics for pavilion501n motherboard

In order to locate a schematic for a specific motherboard, you need to know the motherboard's manufacturer name, mode number and revision number which is stamped on the board. You cannot ask for a computer's motherboard diagram based on the computer brand name and model number.
How to Check Your Motherboard Model Number on Your Windows PC
You can use the the aforementioned link to also get the same info specs of the motherboard without opening the case by using the Command line (CMD.exe) or by downloading a GUI based software app.
However, I prefer looking at the main board for the stamped info.
How did you determine that the CMOS chip is re-configuring itself?
Are you confusing the BIOS with CMOS, which are two separate and distinct components.
If the CMOS battery on the motherboard grows weak, or becomes dead, your BIOS settings will reset each time you power off the computer.
Most CMOS batteries are replaceable; some manufacturers solder them in place.
One of the first tell tale signs of a weakening or dead CMOS battery, is having to reset the system clock.
Try changing the CMOS battery; make sure your computer is unplugged from the wall outlet (or Back-UPS); then replace the CMOS battery; plug the computer into the wall outlet (or Back-UPS); power up your computer, enter the system BIOS and configure it to your specs; remember to save the changes; warm reboot; after POST and O.S. start-up; turn off the computer normally- wait 10-20 seconds, do a cold boot to verify that the system BIOS configuration did not change.
Unless you had an electrical surge or spike that would damage the CMOS chip, in which case you might get a checksum error or.... someone is playing tricks on you by resetting the CMOS chip via its jumper; the only other culprit I can think of off hand is virus code infection to the CMOS chip.

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I have a Probook 4520s checksum error on cold boot. Time and date is reset to 1979 but everything works fine after adjusting both date and time. I changed the CMOS battery and flashed the BIOS. Same...

You need to replace the small bios battery or CMOS battery if you changed it and it didn't work the battery was probably dead. Pull and test the battery. If the battery tests good yep you may have a board motherboard problem. Check the new battery first test any new battery it could be dead on the shelf always good to find out.

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ASUS P5GZ-MX: Cmos Settings Wrong - Tryed New Cmos battery and setting time a date howto fix ?

It may just be that the new battery needs to be charged. I would leave it switched on for 24 hours to check. If this doesn't fix the problem, it could also be a failing BIOS chip or the charging circuit for the CMOS battery has failed. If the BIOS chip is not socketed or the cmos charging circuit has failed, you will need to replace the motherboard or find an electronics engineer to replace the failed components, this will probably be more expensive that a new board.

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Cmos battery error failure

The CMOS (BIOS) battery keeps the computer'a comfiguration and the Date & Time settings in the CMOS (BIOS) chip in its memory. When the CMOS (BIOS) battery is flat these configuration information is lost.
Replace the CMOS battery with a new one, in most cases this battery is a lithium 3 volt battery type CR2032 and it is coin size battery 18mm in dia.(check it to make sure the type of battery is installed on your motherboard).
When you replace this battery then go into the BIOS and set the Date & Time etc.

Jan 26, 2012 | Intel DG31PR Motherboard

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I have a Soya SY-7VCA mobo that hasn't been used for about 6 years. Upon bootup, I received a CMOS checksum error message, but was still able to load a copy of Windows 98SE that I had on floppy. After...

Probably your BIOS battery, replace that and setup you BIOS again and it should be fine. BIOS batteries look like little round watch batteries.

Any more questions just let me know.


Feb 14, 2011 | Soyo SY-7VCA Motherboard

1 Answer

845gvm motherboard beep heard after removing ddr1 ram. how to confirm problem in ram or mbd mahesh maharashtra

Install your ram in another computer,

Or install an another new ram in your pc

If you want to know details can follow the bellow step,

Clear CMOS or remove CMOS battery, shibuda_35.jpg

Press the on off switch for 30 seconds.
Now go to BIOS setup,and set bios load fail save default,and press F10>enter.If the problem is same, change the RAM if you have a spare.

If the problem is same ,take another ,mark on bios chip and remove Bios chip from socket , by thin screw driver ,and install itv again.
follow the pictore

BIOS - The setup program used in desktop and laptop computers/PCs - Page 1 of 2

If the problem is same think *********** board has been defected and you should purchased. .

Hope this helps

Jan 29, 2011 | Intel PENTIUM-4 865GV CHIP MOTHER BOARD...

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My 390 e Will not keep correct time and date how can I fix this?

could be the CMOS battery thats dead CMOS is an on-board semiconductor chip (stores BIOS) powered by the CMOS battery inside computers that stores information such as the system time and system settings for your computer.)
let me know if i can be any further help

Nov 06, 2009 | IBM ThinkPad 390 E Notebook

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How do I replace a dead cmos on acer 4520LCi travelmate laptop? The laptop no longer keeps track of system time when shut off completely. Can you tell me the exact location of the cmos so I can be able to...


what you replace is not the CMOS, but the CMOS battery.

On an ACER from those years the CMOS battery looks like a coin, or a coin wrapped in plastic and connected to the motherboard.

On most models from same series the battery is located on the lower side of the motherboard, like on picture below:


On some model the battery may be located underneath the keyboard.

Here disassembly instructions for a similar model.

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Bad cmos dell motherboard

If u changed the CMOS battery then it should not show the f1 continue . first remove your BIOS chip on the motherboard and then replace CMOS battery and then replace it again after 5 minutes. your problem will be solved

Aug 26, 2009 | Computers & Internet

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