Imac 27" (Late 2012) became really slow (spinning ball) after replacing LCD SCREEN

Discussion in 'iMac' started by crazybrave, Oct 4, 2016.

  1. crazybrave macrumors newbie

    Jul 1, 2016
    Hey Guys,

    I'm not a mac expert, so be patient. But I need help urgently.

    I have an Imac 27" (Late 2012). Recently, I had issue with the monitor and was asked to replace the lcd.

    After returning, the mac seems to be unresponsive and slow. The new screen looks awesome though!

    Done all SMC reset, Vram reset etc and problem still persist.

    My first instinct is the hard drive is faulty. So I did clean install. Still the same.

    Reinstall Sierra on external SSD connected via Thurderbolt and it's still slow.

    The computer fans run at high speed.

    Imac (27INC LATE 2012)
    Memory 24GB

    Any suggestion? Help Please!

    Thank you in advance

  2. Samuelsan2001 macrumors 604

    Oct 24, 2013
    Take it back to the people who replaced the screen and get them to fix it!!!
  3. DeltaMac macrumors G3


    Jul 30, 2003
    Use a utility that will show you the internal temp sensors. Those utilities would also show the speed of each fan.
    Perhaps whoever replaced the LCD panel neglected to plug one or more of the temp sensors into the logic board.
    There's only one fan in your 27-inch iMac, but leaving one of the temp sensors unplugged might make the fan run at high speed. The fan utility should tell you which temp sensor does not have a signal.
    Bottom line, your repair shop needs to open up your iMac, and take a look. If you can tell them which sensor, if any, is not reporting properly, that would give the shop a good place to look.
  4. bizzle macrumors 6502a

    Jun 29, 2008
    The temp sensor on the back of the LCD is either not plugged in or missing.

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