New iMac darker at top

Discussion in 'iMac' started by 4now, May 20, 2008.

  1. 4now macrumors regular

    Joined:
    Sep 20, 2007
    #1
    Is anyone having the issue of there monitor being darker on top.

    A solid colour field show quite a difference between the top and the bottom.
    Which is challenging when graphic designing

    Is this a defect?
     
  2. JayLenochiniMac macrumors G5

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    Nov 7, 2007
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    New Sanfrakota
    #2
    If it's the 20", it's the nature of the TN film panel and not a defect.
     
  3. 4now thread starter macrumors regular

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    Sep 20, 2007
    #3
    it is the New Penryn 20"

    Is there any way to correct this?
     
  4. JayLenochiniMac macrumors G5

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    #4
    Return it and get the 24", which uses H-IPS panel.
     
  5. kappaman210 macrumors newbie

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    Jan 1, 2007
    #5
    And then all you'll have to deal with is a very noticeable left to right gradient!
     
  6. JayLenochiniMac macrumors G5

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    #6
    Not necessarily, if you happen to get a good unit (which plenty of us got).
     
  7. Leon Kowalski macrumors 6502a

    Leon Kowalski

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    #7
    It' NOT the nature of TN film panels, in general.

    It IS the nature of the world's crappiest TN film panel.

    ...is crap a "defect" ?

    LK
     
  8. JayLenochiniMac macrumors G5

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    #8
    Name a TN film panel that doesn't suffer from limited viewing angle in the vertical direction.

    The OP has a NEC MultiSync 90 monitor hooked up to MBP, so that's what the OP is comparing the 20" iMac to.
     
  9. kappaman210 macrumors newbie

    Joined:
    Jan 1, 2007
    #9

    Then I just must have awful luck. All four of my units have had a noticeable gradient shift from left to right. Don't really know if I should just keep the one I have now or go for a complete return. Or just keep trying my luck.
     
  10. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #10
    Not really, choose a non solid desktop picture to reduce the chance of noticing it.

    And for god sakes, nudge the contrast a bit to deepen the colors on the screen.

    Standard contrast will look washed out, at this level it'll magnify the TN issue a lot.
     
  11. doug in albq Suspended

    doug in albq

    Joined:
    Oct 12, 2007
    #11
    Just squint your eyes, and back up about 4-5 feet, then you will not notice it.

    Or do what I did, attach a second display to it.
     
  12. SaSaSushi macrumors 68040

    SaSaSushi

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    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #12
    I had minor gradients on the first two panels in my 24" aluminum iMac (both replaced by Apple for other problems, scratch and flickering backlight) but this third one is a keeper. It has minimal backlight bleed and no noticeable gradient.
     
  13. Leon Kowalski macrumors 6502a

    Leon Kowalski

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    #13
    Ain't talkin' about "limited viewing angle." The 20" ALU iMac panel is
    horrible at 0.0° dead-center. There's NO acceptable viewing position:

    http://picasaweb.google.com/TheLooby/20IMacScreenPhotos


    ..."a wondrous widescreen performance from every seat in the house."

    LK
     
  14. JayLenochiniMac macrumors G5

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    #14
    Again, for the 16.2 millionth time you're making the erroneous assumption that all Alu iMacs suffer from the gradient issue of that sort.

    We'll need 4now to clarify whether the gradient issue described in the OP is the kind shown in your photos (which would be a defect) or the kind caused by the design of the TN film panel. If your eyes are just above the top of the screen and you're looking at a TN film panel, it's very easy to reproduce the gradient exactly as shown in your photo, with the top being darker especially on a solid color background.
     
  15. Leon Kowalski macrumors 6502a

    Leon Kowalski

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    #15
    Again, for the 16.2 millionth time, NO ONE has managed to post
    even ONE photo of an unafflicted 20" ALU iMac. Zero, zip, nada.

    ...I guess Apple owners aren't into cameras and suchlike,

    LK
     
  16. queshy macrumors 68040

    queshy

    Joined:
    Apr 2, 2005
    #16
    lol @ Apple QC (or lack thereof). Maybe it's not QC...maybe Apple was trying to save a few bucks. We have a 24" Alu iMac and perhaps there is a slightly left right gradient, but personally I wouldn't have returned it for that. It wasn't as bad as people make it out to be. Maybe we got a "good" one and it's not noticeable. I can only see the gradient sort of on the Apple start up white screen.

    Hands down, though, the best panel I've ever used is that on my 24" WHITE iMac (previous gen). Matte.

    The second best display is that on the MacBook Air (even though it's glossy it's super bright and the colors are good).

    Go check out the display models in the store, see if they do the same thing.
     
  17. G-Force macrumors 6502a

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    Nov 25, 2006
    #17
    Not true. None of my TN panels (including my 17-inch Core 2 Duo iMac) suffer from these kind of viewing angle problems, at least not as bad as the new 20-inch iMac...
     
  18. Petoz macrumors 6502

    Petoz

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    Apr 1, 2008
    Location:
    UK
    #18
    I think i'm having the same problem. I'm don't do anything graphical on it though, so am not affected by it too much. It would be nice if it wasn't a problem at all though. It shouldn't be. Apple need to sort it out.
     
  19. Sir Tony macrumors member

    Joined:
    Nov 10, 2007
    #19
    Same here. I have two 20" in my house, both have gradient problems, EVERY single one of my friends that have a aluminum iMac suffer from the gradient problem. All the 20" I have seen at 3 different Apple stores have had the gradient problem, along with all of them at Best Buy. The 24" that I have seem have some sort of gradient issue, not nearly as sever as it has been on the 20"
     
  20. JayLenochiniMac macrumors G5

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    Nov 7, 2007
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    #20
    I can easily reproduce the top to bottom gradient by leveling my eyes at the top of the screen of my daughter's G4 iMac (on a solid color background).
     
  21. G-Force macrumors 6502a

    Joined:
    Nov 25, 2006
    #21
    Yes, but that's not the problem with the 20-inch iMac. You will see the gradient when you are sitting right in front of it... That behaviour is not normal, not even for a TN-based LCD.

    Image of the problem:
    http://www.bassandee.nl/imac.jpg

    And that is not from the top! I do not have this problem with my 17-inch iMac.
     
  22. JayLenochiniMac macrumors G5

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    #22
    OK. Bear in mind that some people (myself included) like to keep the top of the screen at or below the eye level (I think too many people place the monitor too high relative to their head), in which case we will always see the top to bottom gradient when looking at a TN panel even without the aforementioned defect. This is "right sitting in front of it" for those of us who prefer this way. It's of course not a problem on laptops because you can easily adjust the screen angle.
     
  23. inkswamp macrumors 68030

    inkswamp

    Joined:
    Jan 26, 2003
    #23
    There's a way to settle this.

    G-Force, will you take a series of photos of that same screen and post them? Photograph it looking straight-on. By that I mean, center yourself as best you can, taking a photo straight at the screen pointing at the middle. Then take a shot from the top, left, right and bottom. If we see a top-down gradient like that in all photos, then it's a problem with the screen, but if we see the gradient moving around from edge-to-edge or diminishing in various positions, then we know it's a perception thing based on where a user is putting their eyes.
     
  24. iVersa macrumors 6502

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    Aug 12, 2006
    Location:
    London, UK
    #24
    EDIT- Don't want to hijack the thread, see my request [here]
     

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