Question about IBM ThinkPad A21m 2628 Notebook

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Your response: your cmos motherboard battery is flat and needs replacing

Can the CMOS battery be purchased and replaced by user, or does it have to be sent to a service center?

I have received the same 0175 CRC1 error on my Thinkpad.

Sandragerdin@cs.com

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I have one if you want to buy? $10 for jlu@stagingconnections.com

Posted on Oct 10, 2008

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Please help me : :' my pc is lenovo g500 and i forgot password bios who help me please


Hi,

I do google your problem and look to the lenovo G500 manual.
here's the manual says.

sources: http://www.lenovo.com/shop/americas/content/user_guides/g410_g510_ug_en.pdf

BIOS password problems I forgot my password. • If you forget your user password, you must ask the system administrator to reset your user password. • If you forget your HDD password, a Lenovo authorized servicer cannot reset your password or recover data from the hard disk. You must take your computer to a Lenovo authorized servicer or a marketing representative to have the hard disk drive replaced. Proof of purchase is required, and a fee will be charged for parts and service. • If you forget your administrator password, a Lenovo authorized servicer cannot reset your password. You must take your computer to a Lenovo authorized servicer or a marketing representative to have the system board replaced. Proof of purchase is required, and a fee will be charged for parts and service.


But in my own way of troubleshooting.
1. open your Lenovo G500
2. Check your motherboard and look for bios/cmos battery.
3. Remove the battery
4. Get flat screw driver then put it between two pins where the cmos battery attached.
5. Hold it for 10 to 15 sec.
6. Put the cmos battery back and the motherboard
7. Power it up and holla the bios setting has been reset to default.

Here the sample image of Lenovo G500 motherboard

25740972-trby4v3i5qhmaaiw2sly1hfm-4-0.jpg
http://www.lenovo.com/shop/americas/content/user_guides/g410_g510_ug_en.pdf

Jun 11, 2015 | Lenovo Computers & Internet

Tip

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

1 Answer

Replace cmos battery and case openning


Asus motherboards usually use a lithium CR2032 battery for CMOS. Also, on the top of the old CMOS battery you took out there should be the exact battery type engraved on the surface.

Batteries Plus in Wichita, KS has a good online store for purchasing your replacement battery.

Dec 12, 2013 | ASUS CS5111-AP007

2 Answers

How to change mainboard battery?


Most PC users don't think much about the CMOS battery until their computer shows signs of losing its BIOS settings on boot up. If you tend to upgrade rather than replace your PC, replacing the CMOS battery every couple of years makes sense.
Likewise, if you purchase a used PC, battery replacement is a good idea unless the PC is less than two years old. It's just one more preventive step you can take to prevent troubles in the future.
If you have never replaced a CMOS battery before, you can find step-by-step instructions below.
In most cases, frequent CMOS errors are a sign of a dead battery. The CMOS battery maintains your settings while your PC is powered off. You can easily replace the battery yourself.


Instructions:
  1. Boot your PC and enter its setup mode.
  2. Write down all of the settings from the various BIOS menus. Click this link to learn more about this procedure.
  3. Power off your PC.
  4. Open the case of your computer
    cmosreplace_1.jpg cmosreplace_2.jpg Figures 1-2. Undoing the screws on your PC case. cmosreplace_3.jpg Figure 3. Opening the case of your PC.
  5. Locate the battery on the motherboard.
    cmosreplace_4.jpg Figure 4. Battery location on the motherboard. The layouts of the components differ on different motherboards, so you'll have to consult your motherboard user manual for specifications about the battery and its location.
    This is a close-up view of the battery on the motherboard.
    cmosreplace_5.jpg Figure 5. Typical CMOS battery. The most common type of batteries used in modern PCs is coin-shaped lithium/manganese-dioxide battery that looks like a large watch battery.
  6. Obtain a replacement battery from a local or online computer parts dealer.
  7. Remove the old battery.
    cmosreplace_6.jpg Figure 6. Removing the old battery.
  8. Replace it with the new one, as shown on the picture below.
    cmosreplace_7.jpg Figure 7. Replacing the battery.
  9. Document the date of replacement for future reference.
  10. Replace the case and power on the PC.
  11. Enter the setup mode of your PC.
  12. Reenter the settings you have written down from the various setup menus.
Tips:
  1. Don't forget to observe proper anti-static precautions when working inside the case of your PC.
  2. If you can't see your battery right away, try removing expansion cards or unplugging cables. The majority of newer motherboards use lithium batteries that look like large watch batteries.
If the battery is already dead and you receive messages saying "CMOS checksum error", skip Step 1 and Step 2.

Sep 03, 2011 | Fujitsu Siemens JETSON POWER (J815-E2F) PC...

2 Answers

I have an intel g41 motherboard....every time i switchon d pc...it shows check cmos error and the time and date are set to defaluts


This error occurs when the BIOS battery is flat. Replace the BIOS battery, most motherboards use a lithium battery type CR2032, this is a coin size battery. Check the BIOS battery type used on your motherboard before you purchase the battery.
After replacing the battery go to the BIOS setting and set the Date & Time etc. and you will not have this CMOS error.

Aug 10, 2011 | Intel Motherboard

1 Answer

Error is the firmware has detected that a coms battery failure occurred


Hello!
i just want to inform you that CMOS battery failure is not a big deal
you just need to replace CMOS battery from the motherboard
CMOS battery is responsible for date and time management in you PC
also it gives a refrence point in time and space when booting
so if you are a serious programmer you may change it immidiately
and if you are a normal user and you are least bothered with system time and date then
you may keep ignoring this message.

thanks and regards
kindly rate this solution!!

Feb 10, 2011 | Intel D945GCLF Motherboard

2 Answers

Came home computer was on black screen and now it won't reboot. When I try to reboot, I get a "cmos checksum error ". Keyboard also isn't working. What could be the problem?


The CMOS checksum error occurs when the CMOS battery is worn out and the CMOS data gets corrupted. Replace the CMOS battery, this battery most likely a CR2032 lithium coin size button battery - check to make sure before you purchase.
After replacing with a new battery, then go to the BIOS configuration and set the Time & Date etc.

Sep 02, 2010 | Gigabyte 7VM400M-RZ (GA-7VM400M-RZ)...

2 Answers

My latptop's internal clock getting problem after some days its reset to year 2002.


The CMOS battery is responsible for the internal clock. If it automatically resets itself to 2002 (motherboard manufacturing date) then you need to have it replaced (it's really cheap to have it replaced).

Jun 14, 2010 | Dell Latitude D510 Notebook

1 Answer

161 bad cmos battery - i already replaced the cmos battery same vaue (CR2032) but different brand. but still 161 bad cmos battery, is it possible to have install the same brand and at the samle time the...


the brand will not matter as long as the battery is the same value. There is one thing need to reset the cmos error message, which is done by unplugging a small jumper located around the cmos battery if you can find the manual for the PC online it will show you the jumpers (which are really small connectors on the motherboard ) needed to be unplugged but reinstalled the way they where before waiting a good 10 seconds after the jumpers are removed should fix the problem

Feb 13, 2010 | IBM eServer xSeries 206

2 Answers

Gateway 450rog cmos battery


The CMOS battery is located on the motherboard, just under the bottom left side of the keyboard, by the letter 'V". It looks like a clock battery, marked 3V (volts). The battery comes out of its "cage/connector" by gently lifting it with a small flat screwdriver. Replacement CMOS batteries are inexpensive and readily available at any computer shop. Hope that helps

Mar 15, 2008 | Gateway 450ROG Notebook

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