flickering problem

hi, I have a new macbook pro. when i work on the logic pro software or any work ,while still in charging mode ,the screen flickers when it reaches full charge. But when i disconnect the charger, the laptop switches off by itself . when i gave it by service to the service people they re installed the operating system , But the problem still continues... Can anyone help

If it's really a new MacBook Pro and not just new to you, then it's still under warranty. Take it on back and request they fix it right. You didn't mention who you took your MacBook Pro to, but if it's new and still under warranty, take it to Apple or an authorized Apple repair service; no one else.

thanks . will do it

Life rule #11: NEVER EVER let "PC repair guys" work on a Mac.