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  • 1,155. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    citrus101 Level 2 Level 2 (235 points)
    Hi fa_design,

    Yes, this is another possible theory and we've a lot of good theories:

    1) wrong alignment of the panels
    2) bad uniformity of backlight
    3) new chemical substances with negative effects
    4) ...

    All these theories are not bad and we should continue to discuss them. I'm convinced that somebody of us solved the flicker issue not knowing it.
  • 1,156. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Dino1956 Level 1 Level 1 (40 points)
    Nathan, I'm no Engineer obviously. But do you mean if the iMac had a Power Brick like the Mac Mini & that PSU component wasn't inside the Casing? That is a great theory. It would definitely increase the heat by in being built inside. Don't forget that the 21.5" iMacs have the same problem.
  • 1,157. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Dino1956 Level 1 Level 1 (40 points)
    Unfortunately, the people who got their screen replaced, did not post pictures after the fact. We just have their word & their eyes. And because they don't have anymore issues they are long gone from this thread.
  • 1,158. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Nathan Hill1 Level 1 Level 1 (0 points)
    The whole pursuit of Apple making the iMac the ultimate all-in-one means that the cumulative heat of all the components has always been an issue. A PSU by it's nature generates a proportional amount of heat, therefore incorporating it within the iMac enclosure adds to the overall temperature of the iMac (download the very handy free app iStat Pro and take a look). If it was a external "power brick" the iMacs overall temperature would obviously decrease greatly.

    All that aside, good point regarding the 21.5" - out of interest who is the manufacturer of the 21.5" panel - is it also LG?
  • 1,159. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Dino1956 Level 1 Level 1 (40 points)
    I believe it is also LG.
  • 1,160. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    citrus101 Level 2 Level 2 (235 points)
    I understand them.

    It's not wise to show us pics. Dino, our recommendations have to be:

    Don't read these threads!
    Don't make GrayBar-Tests!
    Don't send us pics, because we show you the yellow in a second and than you will have it in your head forever and ever!
    Avoid white backgrounds!
    Be happy and sleep well!

    We had so many here saying they have the perfect screen, but after three posts they had some doubts and so they showed us five pics and ... "WELCOME IN THE CLUB!"

    It's not really funny!
  • 1,161. My 27 iMac with AASP
    alma09 Level 1 Level 1 (0 points)
    I'm updating here about my progress with my yellow tinged 27" iMac:

    I brought it a week ago to the local AASP. at first was told to wait 4-5 days, then a week.

    Called them today to find out how it's going, but the person on the phone was always uninformed about the technicalities and was referring to 'a technician who is currently working on it' and which would call me back in 4 hours, then in 2 hours. In fact, I had to call them each time 15 minutes after their new deadline has elapsed.

    I didn't manage to talk to the technician, but was able to get some more information from the person picking up the phone. He said that the tests would continue till tomorrow, as they suspect that it's not the LCD panel itself, but something on the mainboard causing this yellow tinge issue. They are going to find out tomorrow for sure and order a replacement part. So it does look like I'm going to get it back this week, even though I'm trying to be optimistic.

    And he added that they have got quite a few of those new iMacs with similar problems.

    Although I'm not at all comfortable with this AASP now, I don't have much choice now.

    Can anybody tell me if this is normal to test a machine for one week? Or it's them obviously taking their time? Shall I report it to Apple? Now or when I get it back? It's still not clear how long will it take them and I can't really survive so long without a proper desktop.
  • 1,162. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Dino1956 Level 1 Level 1 (40 points)
    Citrus, that is all so true. But I believe my Paranoia got me a nice upgrade, so it was worth it for me. But I'm still putting those devilish Grey Bars up & the 27" & I have to admit, as slight as it is, it's still there. The person who last posted the side by side comparisons, did have a perfect screen IMO. The iMac on the left looked pretty perfect to me. So they are out there. Just so few & far between. I'm going to delete all my grey bar pictures & the tests at some point & move on. Btw, My rep told me, my 27" was hand picked & checked for me before it was sent. Maybe the guy did not have his glasses on or a copy of the Grey Bar Test. It was shipped directly from Shanghai. All in all, I am quite happy with this iMac. All else works perfectly.
  • 1,163. Re: My 27 iMac with AASP
    Dino1956 Level 1 Level 1 (40 points)
    alma09, I don't want to burst your bubble, so to speak, but I have no confidence in any AASP. Do you really think this guy fond the component on the Mainboard that is causing the yellow? If so, why didn't he tell you what they think it is. I'd be completely shocked if after all this, your AASP guy figured out the problem & Apple could not. I'm sorry to say that I am a bit jaded when it comes to AASP shops. I had an iTunes problem once & my AASP told me it was my external MyBook Hard Drive, that was causing the problem. He was wrong. I figured it out myself. It was Locked Files causing the iTunes Crash. He also told me that Western Digital makes the worse Drives & that I needed to get only a Hard Drive with a 3Yr. Warranty. I have been using Western Digital hard drives since 1998. And not one has ever died on me. Good Luck. I'd be interested to hear what he found. Thanks.
    Dino
  • 1,164. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    rickstervt Level 1 Level 1 (0 points)
    Dino, my rep also told me my imac was "screened" befored it shipped from China. Which brings it back to damaged during shipping. I actually mentioned this to my rep and she said apple was looking into that possibility.
  • 1,165. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Schwa72 Level 1 Level 1 (15 points)
    rickstervt wrote:
    Dino, my rep also told me my imac was "screened" befored it shipped from China. Which brings it back to damaged during shipping. I actually mentioned this to my rep and she said apple was looking into that possibility.

    As many iMacs are made in the Shanghai facility, I very, very seriously doubt that they're able to give individual machines special attention. I bet "screened" is an Apple rep euphemism for "passed through the normal QC process."
  • 1,166. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Dino1956 Level 1 Level 1 (40 points)
    Yes, well that was always a practical theory. But my rep told me Apple tests all that in advance. I actually waited 3 Hours to Open the box & power it on, to get the iMac acclimated from the outside cold, to the Temperature inside my home. Someone mentioned that UPS advises this for big screen LCD TV's. So I just tried it. It was hard to wait 3 hours but I did it. Apparently that did not help.
  • 1,167. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    awerty9999 Level 1 Level 1 (15 points)
    Of course it didn't. It is a manufacturer problem and Apple is doing nothing because they want as many people as possible to buy the faulty iMacs, or they lose money.
  • 1,168. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    citrus101 Level 2 Level 2 (235 points)
    Btw, My rep told me, my 27" was hand picked & checked for me before it was sent. Maybe the guy did not have his glasses on or a copy of the Grey Bar Test.


    deemer76 wrote
    "I went to buy my 21.5 iMac again this weekend, and though it looked fine in the store, when I got home, the yellow tinge was there"

    I think the guy, who has hand picked & checked your iMac did a good job.

    We had this situation several times now, that the computer is o.k. in the Store, but not at home. Do you really think they would send you another faulty machine? They know you're our President and they know you would burn down these threads, if you would be disappointed again. No, they gave you the best iMac from Shanghai.

    Is it the quality of our electricity causing the yellowing? We already discussed this, but now we have some new facts, for example that your hand picked iMac is not perfect ... I think it was!
  • 1,169. Re: Yellow tinge from bottom to top of the screen, 27" iMac
    Switch900 Level 2 Level 2 (200 points)
    Hi Nathan, on the question about the 21.5, yes its LG, and your right about the PSU, if they would put the power supply externally definitely the heat generated from the power supply would bring down the the temps enormously.
    I wish they did come up with a solutions but with this big of a screen, the PSU, three fans, where can you put more rooms for cooling, and by all means the GPU when your using Motion, in Final Cut Pro, my god, it starts to rev the Fans at very high speed to a point that you hear it blow out air. Not for nothing the CPU also gets hot when your doing intensive work, but thats the normal way of the beast, plus, I tend to keep my monitor just four dots bright from the zero point, I put the brightness all the way down and count up to 4 dots, thats it, no more, my monitor is not fully blasted. I tend to try to not put it full blast because the LCD does warm up and if you start to do heavy work, this machine does tends to get warm, I have heard stories of not even touch the upper left side, I think heat could be an issues for the yellowing, but there is so many variables, it could be the diffuser, the polorized coating on the LCD panel many things.
    I mean yes this iMac was made public like the best screen, best overall, blah blah, but thats marketing, they have no idea what the real product is going to look like, Look at Mcdonalds, what a nice burger photo, but what you get when you open the box is a sagging burger with lettice that is disgusting, and watery tomato.

    Overall apple is one of the best company when it comes to customer care, but maybe with times like this you gotta understand we are in a financial crisis, and good products is more and more losing the quality that it use to be. I remember back then when you bought any electronic equipment it was solid last long, and you could tell the quality, recently things when it comes to quality in electronics it getting lousy and a bit crappy.
    My first ipod touch 1st gen right after it had a year and one month the freaking home button died out I could use the home button, and apple did not replace it for me, I was a bit upset because I spend more money on that first gen ipod than in the second one, but guess what, apple was nice enough and gave me a 200 euros discount, I complaint yes, I told them that I bought all the updates, and spend 400 euros on a 16 gig ipod that the home button died out, so I told them I am going to buy another one but for sure I am never buying a first gen product, Big mistake I bought this iMac thinking they were good and I really don´t regret it at all because I promise myself not to buy another first gen product. This time I should stick with my word, but I didn't so I got this iMac yeah it has a slight yellow ting but its not bothering me at all I do see it when I am browsing through safari, but thats at the angle I am sitting.
    All I want to say is that I think people should wait out in buying the first iPad, the first of all apple product. Because not even apple is sure if their product is well design, it has come to that point, and I thought that this design of alum unibody was figure out, and I guess wrong I think its still a learning process for apple and us.
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