Step 34
Use a firm plastic edge to scrape the thermal material off the three indicated chips.
Step 35
Apply a new layer of thermal paste to all three chips.
When replacing the logic board, make sure all cables are routed around and above - not under - it, and to connect the two cables that do go beneath before pushing the board into place.
When you place the logic board back in the computer, try not to move it around once the processor has come into contact with the newly-applied thermal paste.
Step 36 — Display
If you are ultimately removing the heat sink & fan assembly, your computer will differ from the images in this section.
Disconnect the inverter cable, the Bluetooth/DC-In cable, and the display data cable from the logic board.