Cinema Display 20" white spot

Discussion in 'PowerPC Macs' started by netsrot39, May 19, 2019.

  1. netsrot39 macrumors member

    netsrot39

    Joined:
    Feb 7, 2018
    Location:
    Austria
    #1
    Hello, I purchased a 20" Cinema Display yesterday that basically is working great but is having a bright white spot (about 1cm big) in the lower right corner. It's only really noticeable when someting white or grey is opened on said spot. What is also interesting is that the intensity of the white spot changes when viewing from a different angle. The previous owner seemed straight up and told me she was only using the display for maybe a year or so, in other words, it hasn't been used a lot.

    I've already searched the web and sadly haven't really found anyting that's giving me useful clues. I'd really like to fix it though because it's kind of annoying. Could it be that the white spot is due to pressure from beneath the LCD or dust? Maybe some of you guys had a similiar problem and were able to fix it. At least I hope it's some kind of fixable.

    Thanks for your tips in advance.
     

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  2. RhianB macrumors 6502a

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    505 USA
    #2
    Hmmm, that looks like pressure damage from a badly placed finger. You could be right in that the frame or something behind it could be pressing on the lcd or maybe it was dropped enough to shift stuff a bit w/o damaging the frame but putting pressure on the lcd.

    That’s a weird one.
     
  3. eyoungren macrumors Core

    eyoungren

    Joined:
    Aug 31, 2011
    Location:
    ten-zero-eleven-zero-zero by zero-two
    #3
    My theory is that these spots are due to pressure.

    I have an otherwise perfect 17" PowerBook G4 that came with an elongated bright spot right above the dock. With the Powerbooks you can temporarily create a similar spot by applying pressure with your fingers to the display. I'm betting that there was a certain amount of pressure applied over time and it burned in. The spot has never diminished on my PB.

    It's possible something is pushing on your display but I doubt it. Most likely pressure got applied in that spot somehow and it burned in.
     
  4. RhianB, May 19, 2019
    Last edited: May 19, 2019

    RhianB macrumors 6502a

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    505 USA
    #4
    I read about a guy using a small suction cup on the backside of a lcd panel (laptop lid opened up via a spudger) to remove the spots. Never tried it but he reported that it worked.
     
  5. netsrot39 thread starter macrumors member

    netsrot39

    Joined:
    Feb 7, 2018
    Location:
    Austria
    #5
    Thank you guys for your answers. Maybe there is a way to fix it I'll have to open it up I guess for further troubleshooting. Do you maybe know what LCDs these Cinema Displays use? Because if I eventually can't fix it I might find a good deal for a new LCD and put that in.
     
  6. eyoungren macrumors Core

    eyoungren

    Joined:
    Aug 31, 2011
    Location:
    ten-zero-eleven-zero-zero by zero-two
    #6
    No idea.

    But if you are going to open it then the manufacturer and part number for the display should be visible somewhere. Based on that you can do a Google search to find an equivalent (or same but inexpensive) LCD.
     
  7. RhianB macrumors 6502a

    RhianB

    Joined:
    Sep 3, 2016
    Location:
    505 USA
    #8

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7 May 19, 2019