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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 [guide|744|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.
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