Defective design and/or high probability of out-of-spec manufacturing leading to 7 replacement LG screens in a row which repeatably demonstrates IR straight-out-of-the-box.
----------
More likely explanation is that you do not know what you are looking for with Image Retention.
Explain to me what you mean by "Image retention."
Wanting to place a order for a MacBook Pro 15 inch retina but wondering if it's a safe buy with all the screen issues people are talking about.
Oh come on guys!
I own a rMBP with LG screen and it's got a little bit retention after I took the test. But what's the point, always use screensaver after 5 mins and display sleep after 10 mins. Then you will forget the term retention.