Very interesting
Hello everybody.
First of all, I live in Dominican Republic. We don't have Apple Stores here.
We only have Authorised Stores / Resellers, that have some minor stock and must of the time, they buy the products upon request from a customer (and double the cost of the product).
Anyway... I went to one local store to order a rMBP 15" with all the options maxed. I received the rMBP on January 12. Sadly (not sure anymore if I should be sad about it) one week after, I noticed that my rMBP was not exactly what I ordered and payed.
While trying to learn how the GPU auto switching works, I discovered mine never switched... why? because I never got what i asked... My rMBP only had the Intel Iris Pro (Yeah, I was like "WTF?? Where is my geforce gt 750m?"), I got the base 15" rMBP, with the CPU maxed (2.8) and the SSD of 512 GB.
Obviously I contacted the store, the said it was a mistake and told me to keep this one for one week until they receive a new one full specs as I ordered. I said "Ok".
Yesterday they gave me the new rMBP with the 2.8 GHz / 16 GB of ram / 1 TB SSD / geForce GT 750m, and let me kept the wrong one till today, so I have time to move all my stuffs to the new computer.
While watching the two rMBP one beside the other (like everyone would do with two brand new laptops) me and one of my college started to notice that the screen of the "Correct" one was a little yellower (yes... we could say it was just warmer, probably must people wouldn't argue if they don't see one beside the other).
Immediately I started to search on internet about a posible issue with the displays and found this thread. After a long reading about posibles reasons (the big deal of LG vs Samsung), I decided to check who was the manufacturer of the displays of both rMBP.
Like everybody here, I copied the Terminal script and hit enter.
For some reason the "WRONG" rMBP didn't respond a **** after pressing enter (like many has complained about not getting anything in return), but the "CORRECT" (yes, the one with the warmer color, but the correct specs) rMBP did respond:
Color LCD
LP154WT1-SJE1
DCN447100RUFD4NA6
So, I was like "Dam... is an LG and according to must people LG display on rMBP are *****" and in my furious head I assumed the "WRONG" rMBP came with a GOOD and SHINNY Samsung display.
Later, while reading other threads, I found someone who wrote something saying that the terminal script to determine the manufacturer, only works in the rMBPs that have the dGPU (Discrete GPU).
Then I was there... smoking a cigarette... sitting in front of these 2 brand new rMPBs 15" Mid-2014... at 3:00 AM.... thinking.... "What if I switch the display of the WRONG one with the display of the CORRECT one?"... "it seems like I already have my solution in front of me".... "everybody have been requesting replacements trying to get the correct display, but I already have a really good looking display and a PERFECT LOOKING display here." so, as you might expect the journey begun and ended 3 hours later (i took all the time of the world to ensure everything was perfect).
Now I have the display I wanted in the rMBP I requested.
BUT WAIT
They real thing I wanted to share is that after switching displays I ran the Terminal script again to confirm the display manufacturer of this other screen (assuming it was a Samsung) but buddy, I was wrong. This is what I got:
Color LCD
LP154WT1-SJE1
DCN446206LQFD4NAM
So, if you compare it with the one above, you'll notice they are indeed the same display model and that the only difference is the production date. This basically tell us that is not really about the manufacturer, but is more about luck.... it seems like these manufacturers can't produce all displays perfectly equal.
Hope my story might help somebody at some point in history....
Good luck
PS: no IR and not a single dead pixel on any of the displays.