Yellow tinge from bottom to top of the screen, 27" iMac

ptharrison109 wrote:
I have been looking at some volume statistics for both Mac sales and yellow screens. Apple reports quarterly sales of all macs around 3m units. That is 1m a month and 250k a week. If 60% of those are laptops, let's guess 30% are iMacs. Maybe 75k units a week. Meanwhile, imac.squeaked is reporting between 15 and 40 problems per week since the flicker firmware fix. So problem reports at that one site approximate: 25 / 75,000 or 0.033% of estimated production. People might not report there because they don't know about it, or they just didn't notice the problem. If 1 out of 300 problem imacs get posted at imac.squeaked, then there might be about a 10% underlying problem rate.

There are also dozens of anecdotal reports of multiple yellow screen iterations. If there were a 10% problem rate, then the joint probability of getting 3 in a row would be about 0.1%. Out of 4 million imacs sold there should be about 4,000 triple-hits, 400 homeruns, and 40 lucky five-baggers out there.

Guesses, all of this. My hunch, based on what we've seen here is that the bad screen rate has probably gone from the 5% range down to the sub-1% range since the display panel part was changed and Apple announced they had "addressed" the problem. But I also suspect that Apple's definition of a bad screen has more to do with yellow blotches and discoloration stripes than it does with grey bar constancy from top to bottom.

What do other posters think about my math and guesstimates?

Nice try but, with all due respect, your figures are totally meaningless. Your calculations and, at best, guestimates make any calculation completely without foundation.

bigmachead wrote:
I called up the customer care China and spoken to them in Chinese, They fully understood the yellow ting problem. After a long talk, They gave me a repair number to replace a new screen. It took 5 days for them to finish this work in Taipei.

I'm happy for you to have fully solved the issue, but you should realize that you got a pretty special treatment and this doesn't prove the general problem has been solved.

Imagine that, last time I spoke to my rep here in Italy (I was asking for the 3rd replacement) he denied having ever heard about yellow screens at all! (at least as far as 21.5" models are concerned).

Maybe you could help other readers by posting the repair number of the new screen so that they can ask for the same replacement you had.

Moreover, if you have a bit of time and a digital camera, why don't you post a picture of your screen displaying the grey bars test on http://imac.squeaked.com/ ?

That would show that a better iMac is possible!

45 pages of obsessive/compulsive behavior, opinion presented as fact, rumor attributed to official sources. I've seen and read this very thread in several HDTV forums over the years. It feeds upon itself. Other Mac forums are actually coining a new derisive phrase known as the "yellow tinge" syndrome.

Very entertaining. Not.

Ptharrison109, I like your logic train. I suspect you are reasonably accurate down to the estimate of the problem rate. However, there is little basis for how you expanded the incident report rates at imac.squeaked to the whole population to arrive at a 10% problem rate. It could easily be 20% or 30% or more. However, even if the problem rate is 50%, you still arrive at a joint probabilility of getting 3 yellows in a row of only 12.5%? We have posters who are up to 4 or 5!? So what do we conclude from the math? That Apple Discussions posters are snake bitten? I suspect only the passage of time and the accumulation of more data will suggest a more accurate answer. Hopefully, by then we are at revision A and the problem has been corrected sometime later this year.

Got a call from Apple about my 3rd replacement that has yellow, dead pixels and dirt under the glass. Their decision is: keep the iMac or get a refund.

So my destination for a keeper mac ends here.

Can you point out some of those HDTV-threads for us? TIA.

Yes, I know a better way to save my screen problem after 6 times of returning iMac. It takes long time for me to doing my work with new iMac.

1. call "official customer care" that you have screen problem and ask for a repair number.
2. finding out your local tech office, contact with and give them this repair number, ( I suggest to send your iMac to the tech office, not reseller)

Here are the screen photos they replaced for me-
http://i.imgur.com/YPbAV.jpg
http://i.imgur.com/S4NrJ.jpg

ps. the repair number will be kept in my mind to avoid unnecessary harm 🙂

bigmachead,

thanks for taking the time to make the pictures of your screen and post them.

I'm a bit embarrassed, though, because I have to say that in my opinion your repaired screen looks just as many others here (except the really serious ones): with a yellow tinge in its lower part.

To prove what I'm saying, I've just taken your image, copied the lower bar and pasted it underneath the higher one to show how different they are while they should be exactly the same shade of grey.
(I also cropped the picture to eliminate the dark borders on my little 21.5" screen .... 😉 )

http://i.imgur.com/He1fo.jpg

I don't mean you have to trash your iMac, of course; if you're happy with it, that's OK, it's your machine. (After all, I'm also keeping mine while I could have accepted a refund)

But please don't say that this is a "problem free, pure color screen" unless you want to help Apple to replace their infamous "Ultimate Display" motto ...

PaoloS wrote:
bigmachead,

thanks for taking the time to make the pictures of your screen and post them.

I'm a bit embarrassed, though, because I have to say that in my opinion your repaired screen looks just as many others here (except the really serious ones): with a yellow tinge in its lower part.

Paolo you are right ....however I must say that this screen is one of the best I have seen so far on this thread, very similar to mine week 8 (which I have decided to keep).

beautiful screen...I would be very happy with this

If I were you I would send it back. Don't opt for the replacement LCD! I took mine to the local authorized repair center and had the LCD replaced for the same reason. Now the yellow is gone, but grays are white and blacks are grey. The colors seem washed out. I've tried to calibrate the screen and adjust the contrast with no improvement. I called apple care again, and they are telling me that it's normal. At this point I want to send it in to apple for them to look at it. The repair center I took it to forgot to tighten up the screws that hold the LCD in place. The glass panel on the front wasn't seated properly. If they couldn't tighten a few screws what else did they do wrong? I made apple care aware of this as well, and can you believe they wanted me to take it back to that place. Unfortunately, there isn't an apple store within 100 miles. Somebody please help?

Thanks Paolos,

Does the withe balance of digital camera effect the test **?"
I am wonder that after many times of return and they finally gave me a better screen, although it's a little improvement out of the low quality produce.

And I agree that Apple should take off the words "Ultimate Display" from their advertisement, It makes much people unhappy and disappoint for it!

Its now official the Yellow Tinting on the new Apple LCD Screens is fixed.
The word has come from the top - Mr. Steve Jobs himself.
(see attached link).

http://9to5mac.com/node/15054

DavidH

Hello,

On the left is my 3rd Imac (week 11), on the right is the 2nd one (week 8).
[img] http://imgur.com/lRp7w.jpg[/img]
[img] http://imgur.com/XM3Kb.jpg[/img]

The new one is worse. Apple boosted the luminosity (in the profile) of the 3rd one.

No hope... I think I will keep it like this...

Message was edited by: You2Mac

Message was edited by: You2Mac

Message was edited by: You2Mac

Probably the problem is behind Apple but not behind customers...