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please help me how to fix my LCD problem ?

Sadly your display assembly will need to be replaced as the T-CON logic is within it. iFixit is out of stock presently MacBook Pro 15" Retina (Mid 2015) Display Assembly so you’ll need to do a bit of hunting. Here’s the Apple P/N 661-02532 you need and here’s the iFixit guide you’ll need to follow MacBook Pro 15" Retina Display Mid 2015 Display Assembly Replacement