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iMac Intel 27" EMC 2546 Heat Sink Replacement

Potenzialmente Pericoloso

Potenzialmente Pericoloso

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Remove the combination CPU and GPU heat sink from your Late 2012 27" iMac.

On the Late 2012 27" iMac, the GPU and CPU share a heat sink and exhaust vent. Use this guide to remove the entire unit from the logic board. Don't forget to apply a new layer of thermal compound before reassembling your iMac.

Follow our thermal paste guide for instructions on cleaning and preparing the thermal surfaces and applying a new layer of thermal compound onto the CPU and GPU dies.

Before beginning any work on your iMac: Unplug the computer and press and hold the power button for ten seconds to discharge the power supply's capacitors.

Be very careful not to touch the capacitor leads or any exposed solder joints on the back of the power supply. Only handle the board by the edges.

Passo 1 Heat Sink Replacement  ¶ 

The CPU will most likely be stuck to the heat sink with thermal compound. Insert the flat end of a spudger between the CPU and heat sink. Gently pry the CPU up by slightly twisting the spudger.

Passo 1 Heat Sink Replacement  ¶ 

  • The CPU will most likely be stuck to the heat sink with thermal compound.

  • Insert the flat end of a spudger between the CPU and heat sink.

  • Gently pry the CPU up by slightly twisting the spudger.

  • Remove the CPU from the heat sink. Be careful not to touch the contacts.

  • To reinstall the heat sink, see our thermal paste guide for instructions on cleaning and preparing the thermal surfaces and applying a new layer of thermal compound onto the CPU and GPU dies.

  • For the VRAM chips surrounding the GPU, install thermal pads or a thick thermal paste such as K5-PRO, rather than regular thermal paste.

  • Install your CPU into its socket on the board, not on the heat sink. Check the orientation and make sure it lines up correctly in the socket. Follow the instructions specific to your CPU type to apply fresh thermal paste to the surface of your CPU. Then, reinstall the heat sink over the top.