I know why there is Backlight Bleeding on Al iMacs!!!

Discussion in 'iMac' started by bluedoggiant, Feb 12, 2008.

  1. bluedoggiant macrumors 68030

    bluedoggiant

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    #1
    On my quest on opening the iMac, i left the imac on for a little while i took the glass panel off. Once I took the glass panel off...TRADA!!! no more backlight bleeding!!! i found out that the foam around the edge of the lcd in the places where it is unusually bright, the foam is sticking out, and the glass, pushes it in, somehow, allowing more light to escape, causing backlight bleeding, i will play around with this more later and see if i can stop it on mine without doing anything queer. just by pushing the foam and testing. I need time to do because i need to settle the dust in my room to make it safe so that dust doesnt get inside, i need to close the air conditioning vent and stuff things under the door. it was quite a journey, but I think its a start.
     
  2. Mindflux macrumors 68000

    Mindflux

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    #2
    It sounds like you are talking more about backlight bleeding (corner brightness and so on) than uneven backlighting (gradient issue).
     
  3. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #3
    Oops!!! never knew that, ill change right away
     
  4. czachorski macrumors 6502a

    czachorski

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    #4
    If that's true, it is just plain bad design. No?
     
  5. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #5
    plain bad design. The foam is just sticking out, and the glass pushes it in, and the foam is in the areas where the bleeding happens. And I witnessed it appear as i started to put the glass on, very slowly. Just need to report to Apple.
     
  6. SaSaSushi macrumors 68040

    SaSaSushi

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    #6
    With the amount of times you take your glass panel on and off is there NO possibility you screwed anything up yourself?? :p

    It's not intended to be user removed.

    My panel has no backlight bleeding. :)
     
  7. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #7
    No damaging... just a piece of cat hair all the way at the bottom, basically hidden by the border, and you only notice it when its off, even when you look for it while its on, you can find it

    Do you have the guts to take off your glass and control the dust be an air can or something? And take a picture if you , or explain how it is, is the foam all at one level? It may have to do with the panels making them stick out, if only we could find out the types of displays each person has and if they have backlight bleeding without taking off the aluminum casing, that i do not have guts for,and even if i did, i dont have the proper tools, just 2 suction cups, plus the suction cups from my spyder2pro:D.
     
  8. harcosparky macrumors 68020

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    #8
    Another trick to keep down the dust .....'mist' the room with water.

    Get a clean aerosol pump bottle, fill with clean water and 'spritz' it around the room. be careful to prevent too much spray from hitting electronics.

    Also spritz your self from head to toes.

    You do not have to SOAK anything, just mist it, I think you get the idea!
     
  9. SaSaSushi macrumors 68040

    SaSaSushi

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    #9
    I don't think "guts" has anything to do with it. I have no reason to remove the glass panel.

    A few weeks ago when I noticed a slight scratch or shadow on my screen I was convinced it was a streak on the rear side of the glass panel that I had just failed to notice up until then. I had convinced myself to get some suction cups and at least pull the panel and take a look before going through the hassle of sending it back to Apple. In the end I decided it wasn't worth it, let Apple sort it. I didn't want dust behind the glass and as unlikely a scenario as it is I didn't want Apple giving me any crap about voided warranties if they could somehow prove I removed the glass.

    I sent it back to Apple and they immediately verified it to be a defect of the LCD panel itself and replaced it. It turned out pulling the panel would have been all for naught anyway.

    If you see backlight bleeding or any other problems on your screen I would advise you to stop with the self-service routine and to send it back to Apple to let them sort it. They make the machines I assure you they know how to fix them. ;)
     
  10. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #10
    Hmm, point, im going in again tomorrow to make sure I didn't leave any marks, i think i left marks on the metal border, ill clear that up, make sure there is absolutely no dust, and thats it. I'm going to prolly call the  store and tell them about the blacklight bleeding, at least i know the reason. I think im also gonna ask for a glass replace because of "what happened" *streaks*.


    how much did you pay? i have APP.

    Also, did they fire it up themselves to see if the bleeding was gone?

    Do they do it in a dust controlled enviroments? did you find dust?
     
  11. SaSaSushi macrumors 68040

    SaSaSushi

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    #11
    I doubt very much you will get any problems with service for removing the panel on your own. I'm not even sure that actually voids the warranty even if they could prove it. Just call them and make a very detailed list of every problem you see with the service rep that you speak to.

    All Macs have one year of Applecare and I have purchased it for the full three years. I paid nothing and neither will you so long as the problems are covered under warranty (meaning they were not self-inflicted).

    I didn't have any bleeding but they replaced my LCD panel with a brand new one and confirmed that it did not have any of the problems I listed on the old one, e.g. shadowy lines on the display.

    This is why I advise you to be very clear in your list of problems to include backlight bleeding. If they agree that the display has this problem then of course they will make sure to send it back to you with no bleeding.

    Just make a list (and check it twice :D).

    I actually did find one dust speck at the upper left corner of the screen which I never notice at all and am not even going to think about opening up to remove myself. It is not a problem for me and I never see it.

    Yes, I am sure they are very careful about doing the operation in a dust controlled area.

    Good luck.
     
  12. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #12
    Thank you so so much. Yeah, I have dust on the inside of mine, i couldn't get it perfect, but better than before. I cant see it cuz the display is soo bright!!!

    How long did it take? I called AP. They said opening the imac doesnt void your warranty.
     
  13. Darkroom Guest

    Darkroom

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    #13
  14. D4F Guest

    D4F

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    #14
    Did you manage to make the screen bleed disappear after you reasembled the unit or it's still there?
     
  15. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #15
    I have some pictures, if you take the actual glass off, its gone (I think, its been a while), but you can see the foam padding out of place in the areas where the bleeding is coming from.
     
  16. SaSaSushi macrumors 68040

    SaSaSushi

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    #16
    What do you mean "out of place"? Are you talking about a defect? I would be very curious to see your pictures, especially a side by side with the glass on and off. Could you post them here?
     
  17. Sir Cecil macrumors 6502a

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    #17
    Thanks bluedoggiant... I take it your avatar is an image of the gradient WITH the glass on?
     
  18. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #18
    SASASUSHI!!!

    Remember when I told you i opened my iMac? I don't have pictures of the actual bleed when the glass is off, but have pictures of the defect (i think, lemme find em)

    EDIT: found ONE that is actual clear and high res, ill post it in full size, sadly the pics dont really show the defect much, but I hope you see what I'm talking about:


    [​IMG]

    See how the foam is sticking out? I believe that's the culprit, Apple doesn't glue them down hard enough.

    My avatar is an unedited picture of the apple symbol on my imac closeup at an angle, nothing special.
     
  19. Darkroom Guest

    Darkroom

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    #19
    i can kinda see what you mean from that photo... but i just don't understand how foam that is not flush with the actual screen (under the glass) would cause a light leak... unless there is light coming up along the side of the screen, or from behind the screen, and the foam is there to block it ?? also, didn't you say the light leaks disappeared when you took the glass off? so it seems that either the glass is reflecting light, or is pressuring against the foam and making it no longer light-tight... ??

    anyone?
     
  20. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #20
    Don't take this for truth, but i THINK I pushed down on it while the glass was off in Front Row and it went away, but I THINK. It's been months...
     
  21. SaSaSushi macrumors 68040

    SaSaSushi

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    #21
    Well, I THINK it's time for you to take one for the team and try it again and see what happens.;) You've already volunteered to be the group guinea pig by removing it all those months ago for basically no reason other than to see what was underneath. lol

    Your efforts shall be greatly appreciated. Just remember, no fans, no open windows, close all A/C and/or heating vents and a moist towel under the doors. Wait about 20 minutes for all the dust to settle in the room then off you go.

    Thanks. :p
     
  22. Darkroom Guest

    Darkroom

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    #22
    i second that request... and i'll add a "pretty please, with a cherry on top!"
     
  23. bluedoggiant thread starter macrumors 68030

    bluedoggiant

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    #23
    Umm... I...OK! FINE! But I'm taking a risk...


    I have time on Tuesday to do it. I'm busy from now till then.
     
  24. Darkroom Guest

    Darkroom

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    #24
    last night at the apple store, i casually mentioned to the head technician at the genius bar that the iMac screen's can be taken off with suction cups, and that one user online claims the glass pressing up against foam around the screen to cause light leaks... he kinda froze and immediately said (in a serious tone) "i can not confirm that the glass can come off this way"... hah... so i guess they're trained to not let anyone know about the glass... pff, big secret...

    then i told him about the youtube vid where the guy uses his toilet plunger to remove the screen... he didn't seem impressed... *sigh* good times at the apple store.
     
  25. Darkroom Guest

    Darkroom

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    #25
    ... this may have been mentioned already on a different thread, but i'm now wondering if the slight color gradient and uneven lighting that is visible on some machines is caused by the screen bleeding... so like, if you fix the bleed than the color shifts go away?
     

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