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Change laptop cmos battery - Computers & Internet

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Hi there,
depending on your laptop model and type ..you would need to disassemble your laptop to get to the cmos battery were you can replace it...although some laptop have a special compartment just for this battery which is easy to get to from under the laptop....

Posted on Apr 20, 2008

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Red screen


Internal Battery? You mean the CMOS battery (silver battery about the size of a nickel that is on the motherboard)?

Never heard of any dependencies of the CMOS Battery and the screen. Are you talking about a laptop? On a laptop you would have to take the screen off in some cases to get to the CMOS battery on it's motherboard. So, if you're talking laptop, then either the LCD Cable to the screen is not in good, the LCD Inverter cables (sits under the screen and has 2 cables in it, one from the screen and one from the the motherboard) is not in good. Remove the cables and plug them back in. Put a piece of tape across where the cable plugs meet on the back of the LCD Screen. One other possibility is you might have broken the lcd cable or mishandled the lcd screen and it is going bad.

Mar 25, 2012 | Dell Computers & Internet

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How to verify that the CMOS battery needs to replace


<p>The CMOS battery is named after the Complementary Metal Oxide Semiconductor power. The CMOS has the current date and time functions for desktop and laptop computers. It allows the computer to automatically adjust the time, even on computers that are disconnected for long time. When a computer no longer has the date and time and forget it on every boot, the CMOS battery probably needs replacing. Some computers have messages when the battery is weak, while others just lose the current date and time after each shutdown.<br /> <p>Time & Date Errors<span> </span><br /> <p><span> </span><br /> <p>1. Turn on the computer. Look in the task bar at the bottom right. Make sure the date and time is set correctly. Double-click the time and click the up or down arrow to switch to the correct time. Click on the arrow next to month to change the month. Click "OK" when finished.<br /> <p><br /> <p>2. Turn off the computer. Wait 3 to 5 minutes and start the machine.<br /> <p><br /> <p>3. Look on the taskbar to see if time was lost and said a strange date January 1, 2000. Replace the CMOS battery, if this is the case.<br /> <p><br /> <p>CMOS Error Message<br /> <p>1. Look for error messages like "CMOS checksum error", "CMOS Read Error" or "CMOS battery failure" when you start your computer. These errors are caused in the machines shut down for several months or when the CMOS must be replaced.<br /> <p><br /> <p>2. Let the computer on for 24 hours. Restart the computer and find the error.<br /> <p><br /> <p>3. Change the CMOS as the return error.<br />

on Jun 21, 2011 | Computers & Internet

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CMOS Checksum error


<b>Issue:</b><br /> CMOS Checksum Bad or CMOS Date/Time Not Set<br /> <br /> <img src="matrix12_1.jpg" /> <br /> <br /> <b>Cause:</b><br /> This issue is caused when the CMOS values are incorrect. This issue can occur because of any of the below possibilities.<br /> * Bad or old CMOS battery. <br /> * BIOS update<br /> <br /> <b>Workaround 1:</b><br /> 1. Disconnecting power from computer without shutting down computer.<br /> 2. Attempt to reboot the computer. If error still occurs after rebooting the computer enter CMOS setup and check all values, this includes verifying the time and date are correct. Once everything has been verified and/or changed make sure you save and exit CMOS setup. <br /> 3. If you have a Phoenix BIOS and have an option for 'Reset Configuration Data', set this value to 'Yes' and save and exit the CMOS. <br /> <p>4. If the computer was had the power disconnected while it was still running it is possible this could cause the CMOS to become corrupt. Ensure that the computer is ready to be shut off before turning off the computer. If you have a laptop computer ensure that the battery is charged before disconnecting the power connection. <br /> 5. If the CMOS values have become corrupted entering the values in CMOS setup and saving and exiting CMOS should resolve your issues.<br /> <p><b>Note:</b> If this issue continues to occur after you turn off your computer off it is possible that the CMOS battery may be failing or already bad. Before considering replacing the CMOS battery try leaving your computer on for several days. <br /> <b>Workaround 2:</b><br /> <p>If you performed workaround 1 and the error occurs again after a complete power down (i..e. removing the power cord), the CMOS battery is likely bad. Most systems use a small coin style lithium battery. These often last 3-6 years, but at some point run out of juice and need to be replaced. For desktops, your system manual or motherboard manual should specify the type of battery and location on the motherboard. For laptops, it is often very difficult to access and may require a professional to replace it. To replace the battery on a desktop system:<br /> 1. Turn off the system and remove the power plug.<br /> 2. Remove the case or side panel to access the motherboard. <br /> 3. Look for a round silver coin cell, typically in a black holder.<br /> <br /> <br /> <img src="matrix12_0.jpg" /> <br /> 4. Remove the battery while noting which way the battery is located. You may need a small flat screwdriver to release the side clip. <br /> 5. Install the replacement battery with the same battery type, being careful to insert it in the same direction as the removed battery (or using the polarity marked on the holder or manual). <br /> 6. Reassemble the case and power. <br /> 7. Turn on the power. You will get the CMOS Checksum Bad error once more, but it should be the last time. Go into the BIOS setup and set the date and time, and any other options you prefer.<br /> <br /> <br /> Hope this will help...Your response is very much appreciated...

on Jan 24, 2011 | Computers & Internet

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When booting my dell optiplex GX270 desktop,"alert! system battery low pops out, press F1 to continue or F2 for setup utility" and the screen colour chances. please, what do i do?


i think this is the problem about your cmos battery so first you change your cmos battery contained in your lap top.it is attached with your laptop motherboard.

Sep 03, 2011 | Dell OptiPlex GX270 PC Desktop

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Locate and change cmos battery


Turn your computer off and unplug it. Next take the cover off exposing the keyboard. Then in the lower right corner (or somewhere near it) there will be a round silver looking battery. That is your cmos battery. There should be a spot where you can pop the battery out. Then put your new battery in and you are ready to go.

Apr 14, 2009 | Computers & Internet

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How to clear an unknown BIOS password.


<span><span>Clear using jumper (recommended)</span><br /> <p><b>Precaution:</b> When inside the computer please be sure you're aware of the potential damage that can be caused by <a href="http://www.computerhope.com/esd.htm">ESD</a>.<br /> <p><img src="jumper.jpg" />On the computer <a href="http://www.computerhope.com/help/mb.htm">motherboard</a> locate the BIOS clear / password <a href="http://www.computerhope.com/help/jumpers.htm">jumper or dipswitch</a> and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD as shown in the picture to the right. To change the jumper simply remove it from the two pins its currently on so that it covers the pin that is not covered. For example, in the picture to the right pins 1 and 2 are covered, you'd remove the jumper and put it on pins 2 and 3.<br /> <p>Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.<br /> <p>The location of the jumpers or dipswitches are dependent on the manufacturer of the computer and motherboard. However, below are some general ideas on where to find it. Remember that most motherboards could have dozens of different jumpers, make sure you're changing the CMOS jumper and not something else. If these general suggestions do not help refer to your motherboard / computer documentation or skip to the next step.<br /> <ol> <li><b>On the edge of the motherboard</b> - Most jumpers are located on the side of the motherboard for easy accessibility, verify by looking at all visible edges of the motherboard.</li> <li><b>By the CMOS battery</b> - Some manufactures will place the jumper to clear the CMOS / BIOS password by the actual <a href="http://www.computerhope.com/jargon/c/cmos.htm">CMOS</a> battery.</li> <li><b>By the processor</b> - Some manufactures will place the jumpers by the processor of the computer.</li> <li><b>Under the keyboard or bottom of laptop</b> - If you are working on a <a href="http://www.computerhope.com/jargon/l/laptop.htm">laptop computer</a> the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.</li> <li><b>Other visible location</b> - While it is possible that the jumpers / dipswitches may not be in a visible location, most manufactures try to make things easier by placing the jumpers / dipswitches in another visible location.</li></ol><span>Remove CMOS battery</span><br /> <p><img src="cmos.gif" />Removing the CMOS battery like the one shown in the picture to the right will cause the system to loose all CMOS settings including the password. To do this locate and remove the <a href="http://www.computerhope.com/help/cmos.htm">CMOS battery</a> on the<a href="http://www.computerhope.com/help/mb.htm">motherboard</a> for at least five-minutes. After this has been done put the battery back into the computer and turn it back on.<br /><span>Jump the CMOS solder beads</span><br /> <p>Older computers and especially older laptops don't have jumpers or dipswitches and require the user to jump a pair of solder beads on a circuit board. The identification and location of these solder beads can vary and if not available in computer documentation is only obtainable through the computer manufacturer.<br /> <p>If you've identified the solder beads they can be jumped by placing a flat-head screwdriver over the two beads and leaving it on those beads while turning on the computer. Once the computer has booted turn off the computer and then remove the screwdriver.<br /></span>

on Jan 04, 2011 | Computers & Internet

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Fujitsu Seimens Laptop V2030. I have removed the 2030 disk shaped cmos back up battery placed under sticky tape and replaced with new. The computer will now not boot up. I have power to the fan but no...


changing this shouldn't cause or harm it at all. except if you change it the wrong way it could burn the bios chip's internal blocks.

1. remove the battery, + big battery + ac charger
and wait 15 minutes, then boot.

2. try booting without the cmos battery

3. try swapping the memory

why did u change it in the first place?

Mar 02, 2009 | Computers & Internet

2 Answers

Locating and replacing cmos battery on a viao pcggrx500k laptop


It should look something like a watch battery. Make sure to be carefuk monkeying around the innards of a laptop though if you feel you have to change it yourself.

Dec 29, 2008 | Computers & Internet

1 Answer

I have a Dell c610 laptop and I want to change system setup. How do I clear the CMOS?


Open it up. Take the cmos battery out. Tap on ur power button. Make sure all your leads and anything supplying power to it out. Tap on ur power button numerous times. Then put the battery back in. plug everything back in then wala. u have got a clear cmos.

Dec 04, 2008 | Computers & Internet

2 Answers

My computer is changing the time back to 31/12/02 every time its turned on


Your motherboard backup battery is gone.
This is a watch type battery mounted on the motherboard that powers the chip (CMOS) that retains basic information (BIOS) about your computer while it is turned off.
The battery is gone and not holding the time and date.
The battery is very easy to change, do you have a tower computer or a laptop and are you OK with looking inside the case for the battery?

Aug 15, 2008 | Packard Bell Computers & Internet

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