12.1" business laptop released in June 2012 by Lenovo. This laptop uses multiple product numbers, which vary based on configuration.

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ThinkPad lenovo not charging

Hi I need help the lenovo ThinkPad is not charging ,not sure there's a problem with the port .

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Check to make sure the power cord is firmly in place in the power adapter. The power cord sometimes loses contact with the receptacle in the power adapter.

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Usually this is due to bad charging circuit in Thinkpad.

If you have a meter, remove the battery and you will see a set of connector from Thinkpad to battery.

The first 2 slightly longer connector pins is Negative. The next 3, you should get 3.3v when power adapter is plugged. If one of them is missing, your battery would not charge.

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Remove the battery and the AC adapter (charger). Press and hold the power button for 3 - 4 seconds with these removed. Pop your battery back in, along with the AC adapter. If it still refuses to charge, you could be looking at a bad battery or possibly a bad charging circuit on the motherboard.

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The first thing to do in situations like this is to power up the laptop without the battery installed, and then put the battery in after it is into Windows. If it works like this, there is likely an issue with your battery causing the BIOS to reject it. If this fixes it and gets it to be recognized, you will need to replace the battery as there is a serious problem with the battery. The guide to replace the battery can be found here.

If you find the laptop still does not charge the battery, try a different power adapter. You can often use a good 3rd party adapter like a Targus with these laptops, as Lenovo laptops are not picky about chargers. More often then not, it's caused by an old charger that failed. if you still have issues, it may not be a bad idea to try replacing the power jack and seeing if this fixes the issue. There is no guide on iFixit for this, but the Lenovo HMM has the procedure on how to replace the jack.

If neither of these fix it, it's a charging circuit problem. Refer to the other answers on how to troubleshoot this, since they do a very good job of explaining how to troubleshoot it. However, I'd like to add that the fuse is often at fault in situations like this, since the fuse is first to blow to save the rest of the components from failing. If you find a blown fuse, don't just replace it. You will need to troubleshoot the board and find out what caused it to blow BEFORE you replace it, and fix that. Only when you fix any other problems is when you should replace the fuse.

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