Plugged in, but not detected and not charging

recently i sent my laptop for repair, but after 1 month, the same problem occured.  I plugged the charger in, but it is not detected.  it even won't charge the battery.  sometimes it happens, but sometimes it can be detected the charger.  Usually it does not detect.. what should i do? what may be the problem?

Hi
Welcome To Lenovo Community
We are really sorry to hear about the issue you are facing,  
You may want to try below different methods and check which one work for you.
Method A:
Remove the AC and Battery from the laptop
Press and hold the power button for 30 to 40 seconds
Replace the battery and AC
Boot the laptop up and check if the same message is still displaying
If same error still persist, try to uninstall Lenovo Energy Management, reboot then install the Energy Management software again.
Method B:
1.Open Lenovo Energy Management
2.Click on the bottom gear icon between i and ?.
3.Under Battery Health, Click on Start for Battery Gauge Reset. (refer to Fig. 1 below)
4.That should refresh the gauge and let the system finish through the cycle.
Method C:
1.Open Lenovo Energy Management
2.Click on the bottom gear icon between i and ?.
3.Under Battery Health, choose "Optimize For Battery Runtime" instead of "Optimize for Battery Lifespan".
Note: The latter option will extend the lifespan of battery by limiting the charging capacity to be between 0-80%. 
http://forums.lenovo.com/t5/IdeaPad-Y-and-U-series-Laptops/Z570-Battery-plugged-in-but-not-charging-...
 Do give this a try and let us know  
Hope This Helps
Cheers!!!
WW Social Media
Important Note: If you need help, post your question in the forum, and include your system type, model number and OS. Do not post your serial number.
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    Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
    Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
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