Hi guys. I am getting my rMBP with dGPU (Mid 2014) replaced again after having problems with it and now i need to know, Is there a way to predetermine what has an LG and what's a Samsung? I am on my 3rd replacement with an LG and having the same problem. Is it possible to check by the build week using the serial number? When was yours made and what screen do you have? Please help. Thank you. S.