I managed to replace the 15" retina display assembly myself and save big bucks. I found the new exact display assembly for $160 on eBay. Apple store want over $600. when you do the works, pls make sure you are calm and in a good mood. The instruction is a strait forward. Thanks to ifixit.
Replace the whole display assembly!
I managed to find an exact 15" retina display assembly for $160 (an Apple genius want over $600) and replaced my damaged one. The ifixit's instructions is a straight forward. Make sure that you are calm when you reconnect the 3 tiny connectors back, yes very tiny. Thanks to fixit.