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  1. #1


    Member Since
    Apr 02, 2009
    Posts
    7
    Display banding problem
    Hi, I've just bought a second-hand iMac (2009) which has a problem with the display. This has four or five horizontal bands across the screen, increasingly dark from top to bottom. Is the problem likely to be the ATI video graphics card, LED driver board, or something else? Many thanks

  2. #2

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    33,318
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    You could try a fresh install of the OS...but it is more than likely a problem with the logic board. And logic boards on Mac's are generally too expensive to replace compared to the value of the computer.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3


    Member Since
    Apr 02, 2009
    Posts
    7
    Thanks Nick, I'll try the OS fresh install anyway - you never know, it might work...

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    47,135
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, El Capitan
    If this is a 2009 24" iMac, it's a known problem. Do some googling and you'll find quite a few posts describing the same thing. Sometimes it's the LCD itself that has gone sour, and other times it's just like Nick stated.

  5. #5


    Member Since
    Apr 02, 2009
    Posts
    7
    I fitted a replacement LCD and that solved the problem. At least it was cheaper than having to replace the logic board!

  6. #6

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    33,318
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by Mike Sharrard View Post
    I fitted a replacement LCD and that solved the problem. At least it was cheaper than having to replace the logic board!
    Hey...that is better than having to replace the logic board. Congrats!

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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