Solved CMOS battery doesnt work even when replaced with new one.

Johnw January 22, 2017 at 22:30:05

3 Troubleshooting Tips Guaranteed To Boot Your PC’s Motherboard http://www.makeuseof.com/tag/3-trou... The Basic troubleshooting guide is intended to provide you with a guide to problems that you may experience with the system http://service.msicomputer.com/html... How to Diagnose Motherboard or Processor Problems http://smallbusiness.chron.com/diag... Testing my computer motherboard and CPU for failures? http://www.computerhope.com/issues/... How to Troubleshoot for Motherboard Failures http://www.wikihow.com/Troubleshoot... Troubleshooting a Computer Motherboard https://www.ifixit.com/Wiki/Trouble...

Derek January 23, 2017 at 06:20:30

You say your PC has the same problem. That isn't any help to us because we don't know what problem you mean. Best bet is for you to tell us what issue you are trying to fix - other folks problems are not necessarily the same as yours. Always pop back and let us know the outcome - thanks

OtheHill January 23, 2017 at 06:37:23

Possible for there to be a problem with the Motherboard but that may not be the case. Installing a battery upside down will not work. Bending the contacts when removing or install the CMOS battery will result in no continuity. Changing the location of the CLR (clear) CMOS jumper can result in CMOS settings not being saved OR WORSE. Finally, not saving on exit will discard any changes you made while in the BIOS. The CMOS battery only saves changeable settings when the power to the computer is off.

Derek...sorry.. I mean to say my PC shows checksum error saying CMOS battery not working.. I replace it with new battery. But the problem still persists.. Once I switch off, the computer doesn't show current date and time when I switch it on back again

OtheHill January 23, 2017 at 08:39:20

To be clear, do you make the necessary changes when inside the BIOS and save when exiting? Di you look at any of the links posted in #1 above, or check any of the possible causes I posted in #3 above? Post the model of the computer or motherboard.

Johnw January 23, 2017 at 14:36:50

How To Replace The CMOS Battery In Your PC Install a New CMOS Battery http://www.hardwaresecrets.com/arti... http://en.kioskea.net/faq/625-repla... http://www.computerhope.com/issues/... http://www.duxcw.com/faq/cmos/cmos.htm http://www.cybertechhelp.com/tutori... http://repair4laptop.org/notebook_b... CMOS checksum error http://www.computerhope.com/issues/... Can you tell me what causes CMOS checksum errors? http://www.duxcw.com/faq/cmos/check... http://en.kioskea.net/faq/618-cmos-...

melee5 January 23, 2017 at 16:37:55

Just because a battery is new doesn't mean it's a good one. They often sit there for ten years before you come along and buy it. You'll need a voltmeter to measure the voltage and have proof that there is any snot left in that 'new' battery. And SAME for your PC. Two for two, dead batteries both, new in the package. It happens, think outside the box on occasion. No other possibility works as good as this theory, so it might be such? Again, you'll need an $8 harbor freight voltmeter to prove it. And a better place to buy your batteries. Lee

Derek January 23, 2017 at 17:07:07

Re #7 .. and even then you cannot really be sure unless you apply a suitable load (within the spec for the battery). This applies to all batteries. Often those which will only produce a glimmer of light from a flash lamp, for example, will still measure the full (or nearly full) voltage. Try the same test with the bulb connected across the battery and the voltage will then fall down to near zero. Always pop back and let us know the outcome - thanks message edited by Derek

DAVEINCAPS January 23, 2017 at 19:17:44

✔ Best Answer

Also possible a battery holder solder joint is broken. Could be a short. Did you remove the motherboard recently or could a wayward screw have dropped inside? I accidently set a removed motherboard on a piece of steel wool once. After that although it worked OK it would never hold the cmos settings.

OtheHill January 24, 2017 at 06:18:21

#3 above mentioned battery contacts. So you didn't check them then?