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  1. #1
    Question iMac Thin red vertical line halfway on 27" display (Mid 2010)
    Hi,

    Has anybody experienced anything similar? The line appeared not too long ago - doesn’t go all the way like in other cases I have seen. Red, quite thin just above halfway up - most visible on dark backgrounds, less so on others.

    pics here: https://imgur.com/a/St98sc8

    Mid 2010 A1312 (EMC 2390)
    2.8 GHz Core i5 (I5-760)
    16gb ram
    Currently installed High Sierra.

    The graphics card is Radeon HD 5750 - has been fine up until this appeared. No line on external display.

    Any advice or direction for research is appreciated. Thanks!

  2. #2
    iMac Thin red vertical line halfway on 27" display (Mid 2010)
    IWT's Avatar
    Member Since
    Jan 23, 2009
    Location
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Posts
    4,626
    Your Mac's Specs
    Late 2015 5K 27-inch Retina iMac, 4GHz i7, 32GB RAM, 1TB Flash Drive, macOS High Sierra 10.13.6
    Firstly, let me extend a very warm welcome to our Forums.

    Secondly, I'm no expert in this area, but I should have thought that if there is no such problem on an external display, that would tend to rule out a Graphics Card problem and perhaps point to a linear pixel issue with your Mac's screen.

    But hold on till wiser counsel get a chance to offer better advice.

    Ian
    Ian

  3. #3
    iMac Thin red vertical line halfway on 27" display (Mid 2010)
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    29,490
    Your Mac's Specs
    iMac late 2012 21.5 i5 10:14. iMac 2010 27"QuadI7 OS10.13, MBPLate2011, iPad Pro10.5", iPhone5s,
    I 2nd Ians advice. sounds right to me. It could be a dirty pin on the connector from the display to the board but that would mean opening up the iMac and with those models it's not easy.

    IFixit has a guide as well as OWC has videos.
    ...Dennis

  4. #4
    Thanks for the help. I think I will order an ldvs cable and risk opening it up, or try unpluggin and replugging in the connections. Hopefully that's all it is and not the whole LCD - I don't think it's worth replace the whole screen. Hopefully it doesn't worsen.

  5. #5
    iMac Thin red vertical line halfway on 27" display (Mid 2010)
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    29,490
    Your Mac's Specs
    iMac late 2012 21.5 i5 10:14. iMac 2010 27"QuadI7 OS10.13, MBPLate2011, iPad Pro10.5", iPhone5s,
    Quote Originally Posted by FarmerJim View Post
    Thanks for the help. I think I will order an ldvs cable and risk opening it up, or try unpluggin and replugging in the connections. Hopefully that's all it is and not the whole LCD - I don't think it's worth replace the whole screen. Hopefully it doesn't worsen.
    That just might do it. I have had a few iMacs where just unplugging and plugging fixed any lines. Keep us posted.
    ...Dennis

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