found yellow tinge source of problem. "solved"

Discussion in 'iMac' started by neonkru, Dec 1, 2009.

  1. neonkru macrumors regular

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    Nov 3, 2009
    #1
    Hi! While me and my friends were trying to figure out possible causes of this issue on LED screens, someone came up with the brilliant idea that the problem could be caused by the sound speakers.
    His recently LED TV had the same problem. He found out that what was causing the yellowish tinge on his TV were the Sound Speakers.

    Why?

    Volume speakers use magnets, so the magnetic field was screwing up the colors on his tv tending to yellow. After having removed the Sound Speakers the yellow tinge disappeared in about 2/3 hours. I tried this on my led screen laptop with a magnet I had in the kitched, and guess what!!!!! It worked :D:D, color changed, not for yellow but it changed for sure.

    The Sound Speakers on new imacs are near yellow tinge, that's why some people are getting it worse. I've reported to apple. Faulty design Quality Control.

    If you have his tell us if you're using internal or external speakers. This may lead us to more clues. Thank you
     
  2. sfmountainbiker macrumors regular

    Joined:
    Oct 21, 2009
    #2
    Sorry, you're wrong. I don't have magnetic speakers next to mine and I have the yellow tinge (on my second now). It's a yellow bar running vertically down the second quarter of my screen. As I read these threads, the background changes hue under the sentences. :(

    But I do know what you mean about the magnets and screens. I used to have this problem with an old TV of mine.
     
  3. neonkru thread starter macrumors regular

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    Nov 3, 2009
    #3
    imac use internal speakers. they have magnets. just try out a magnet on your imac screen on the top, you will be able to recreate the problem.
     
  4. sfmountainbiker macrumors regular

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    Oct 21, 2009
    #4
    The speakers do not run vertically down the second quarter of my screen. ;)
     
  5. jvalente macrumors member

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    May 22, 2009
    Location:
    Sydney, Australia
    #5
    the invisible magnetic fields might.



    I thought this problem only affected CRT monitors?
     
  6. uuaschbaer macrumors regular

    uuaschbaer

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    Aug 31, 2009
    #6
  7. Gabrao macrumors newbie

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    Nov 22, 2009
    #7
    Although the idea seems good. I highly doubt that the apple enginers did not think of this... because the result of the magnet plus screen equation is known by most (at least people know not to put magnets on screens...)

    Anyways, my point is, maybe on some imacs, the isolation of the screen from these magnets is faulty in some ways (have no idea of how they would do that)) but they used to have a magnet on the side of the screen for the remote and it never affected the screen.

    It's a good idea tho, hope my imac will arrive without a yellow tinge, and i'll see if there is a difference when i use my external speakers... but there shouldnt because the imac speakers will still be there.
     
  8. neonkru thread starter macrumors regular

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    Nov 3, 2009
    #8
    well theorically external speakers shouldn't affect it because they are not close enough to it, but nobody here tried to remove them yet to be 100% sure. i guess we are going to wait for apple to solve the issue.
     
  9. senseless macrumors 68000

    senseless

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    Apr 23, 2008
    Location:
    Pennsylvania, USA
    #9
    LCD screens are not affected by magnetic fields. CRTs (tube type tvs and monitors) are, because magnetic fields are used to control where electrons hit the screen.
     
  10. CeeZee macrumors member

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    Nov 5, 2009
    Location:
    Wynnewood, PA
    #10
    So, is it okay if I put my subwoofer on the floor underneath the desk that holds my new 27" iMac? And is putting the surround speaker about 6" away from the iMac also okay?

    I'm just concerned that there is a difference between LCD and LED in being okay with magnetic fields. I know that I didn't have any problems with my LCD PBook being so close. Just worried that there might be a problem with the LED display.
     
  11. neonkru thread starter macrumors regular

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    Nov 3, 2009
    #11
    it is not confirmed that the speakers are really causing this. it may just be a coincidence that magnets also cause yellow tinge. i always avoid having cellphones and so near no my screens and hard drives.
     
  12. kgeier82 macrumors 65816

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    Feb 18, 2008
    #12
    Honestly, youre an idiot if you put any type of larger magnet next to any computer, Imac or not. Smaller ones, eh fine, but a sub? :D
     
  13. Mystic385 macrumors member

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    Nov 8, 2009
    #13
    These are not LED displays but LCD displays with LED backlighting. Which is different to the LED screens we're now getting on TV's.
     
  14. macdk macrumors newbie

    macdk

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    Oct 28, 2009
    Location:
    Denmark
    #14
    I have an i7 imac and I also "think" I have the yellow tinge. I say "think" as I'm not sure if I'm just seing the yellow because everyone else is :)

    I see it if I'm sitting in front of the computer and have used it for a while, but if I leave the room and come back it appears to be gone until I start using it a little again.

    To test this I have set the background of the desktop to be the solid white color, and when I return to the computer (no screensaver or blank screen activated) the the white color is white all over. After looking at the screen for a bit then I start to see the yellow tinge. So perhaps some of us are being hit by welders eyes :)

    Other than that I have "only" 1 or 2 dust specks under the glass and I'm all in all happy with this mac (first all-in-one computer I've ever had)
     
  15. SkyFox244 macrumors member

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    Nov 14, 2009
    #15

    Could it be that if you enter the room the viewing angle is different?
    And you can not see the difference because the whole screen is not in an ideal angle.

    I my self tilted the screen and the color difference is still there.
     
  16. zerolight macrumors 6502

    zerolight

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    Mar 6, 2006
    Location:
    Glasgow
    #16
    I think it's entirely the viewing angle. If I sit directly in front of mine, white is pure white and looks great, except perhaps the very last inch which is marginally off white. Marginally.

    But if I crouch down to look directly at that, it's pure white again.

    If I stand up and look at the screen, it has a much more obviosu gradient. Sit down in the user position and it's perfect again.

    I suspect that those folk who have been looking at others screens (in a shop or at home) have been standing up, peering over someones shoulder. Whereas their own "perfect" screens are view sitting down.
     
  17. SwiftLives macrumors 65816

    SwiftLives

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    Charleston, SC
    #17
    Nope. Seated. On mine, the color temperature was very obviously warmer at the bottom than at the top. And I confirmed this from multiple viewing angles as well.
     
  18. zerolight macrumors 6502

    zerolight

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    #18
    Any chance of a photo. I'm curious as to how bad it is on some screens vs others. In comparison to my Thinkpad, my iMac is exceptionally uniform in colour.
     
  19. zrankin macrumors member

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    Jun 16, 2009
    #19
    Most of the advertised LEDs are LCD w/ LED backlighting. So it is the same concept unless the tv is a True LED or OLED.
     
  20. macdk macrumors newbie

    macdk

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    Oct 28, 2009
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    Denmark
    #20
    No it's when I get back in the room and sit in front of the imac. After looking at the very bright white screen I begin to see the yellow area to the lower right. But I can't help to think that it might be in my head and that I'm seeing "ghosts" :)

    And honestly I don't think this is the right time to exchange the affected Imacs - give the production line a little more time then perhaps change the display/imacs - from the looks of it there's a high chance that the exchanged imac will also have the tinge.
     
  21. SwiftLives macrumors 65816

    SwiftLives

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    Dec 7, 2001
    Location:
    Charleston, SC
    #21
    This is my fear, too. And with having to wait a week for a replacement, I'm falling a bit behind in some of my work. Not good.

    If my replacement has the same problem, I may take it to the Apple Store and let them deal with shipping it.
     

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