OK everyone, here is my story about image retention (which is now resolved):
Since I began having the problem with image retention late last year (LG display of course), I was keeping my eye on Apple making an official announcement about the problem. I lived with the issue since I live over an hours drive away from the nearest Apple store, and calling Apple Tech support was fruitless.
Finally, last week, I took it to the Apple store in Richmond, VA (made appointment with Genius Bar) because the image was becoming unbearable. Leaving a web browser open for several minutes would keep a ghosted image retention on the display for several minutes more. The checkerboard test was shocking.
When I showed up at the Genius Bar, the genius seemed knowledgeable about the image retention issue. He said they have had a couple of cases of it come in. He rebooted the laptop and hooked up a diagnostic tool which ran through hardware tests. Finally, he did a checkerboard test, via the Apple diagnostics software. This proves that Apple is well aware of the issue since they have actually wrote software to test for it.
The test consisted of showing the checkerboard for several minutes (can't remember exact amount but it was at least 5 minutes) and then the screen would fade to black and remain black for 2 minutes. After that the genius looked for any residual checkerboarding against what looked like a very dark gray background. During this test, I was very nervous because this did not seem at all like a "real world" test and I thought it would be an excuse not to replace the screen. I started criticising the test while he was running it.
Anyways, after the test completed, the genius could see some faint checkerboarding and failed the display. I was so relieved! He said they had another display in stock and it could be fixed in about 3 days if I left the unit at the store. Of course, it would be fixed free of charge, but out of warranty, the screen would have cost $700 to replace!
It did not take 3 days to have replaced. It took 5 days for them to do the repair. Then they called me yesterday telling me during the screen replacement the logic board was damaged and they had to give me a whole new laptop! Not only that, they were giving me the top of the line Retina with 2.7 GHz processor and 768 GB SSD. Wow!!!! I had, previously, a 2.3 GHz wtih 16 GB memory and 256 GB SSD. I think the fact that I had 16 GB RAM forced them to give me an upgraded unit from what they had in stock. From what I can tell, the replacement unit is retail about $1300 more than what I paid. Oh, and the replacement unit has a Samsung display! Very nice of Apple to do this for me!
While Apple has not been broadcasting this issue to customers (such as doing a recall), they seem to be taking care of customers with the issue at the Genius Bar. That is fine, but not everyone lives near an Apple Store so if you live in the boonies you might have a problem getting your problem resolved without making a special trip to an Apple Store, I am sorry to say.
I would strongly recommend that if you take your unit to the Genius Bar that you make sure your unit is warmed up before taking it in. I sat at a cafe using the unit for 20 minutes immediately before taking it in. Having the screen warmed up will make sure the image retention is at its maximum because my unit did not do it when cold.
If you fail the checkerboard test that Apple runs, I would politely ask the genius to run it a second time and explain the issue about the screen needing to be warmed up for the problem to occur. If it fails again, I don't know what you can do to convince them to do a screen replacement.
So, other than having to drive an hour to the Apple store (twice) to get the problem resolved, I have been very satisfied with how Apple has handled my case. Hopefully, by now, Apple has eliminated the defective displays from their inventory, but maybe not.
Good luck,
Eric