Warning: Whenever the logic board is separated from the heatsink (even if you are installing the same board or heatsink), the thermal grease must be completely removed and replaced. Failure to do so can cause the computer to overheat and be damaged.
1. With the logic board installed in the bottom case and the heatsink removed, use a black stick to remove as much thermal grease as possible from the two chips on the logic board and the two pads on the heatsink.
2. Use an alcohol wipe to completely clean the residual thermal grease from the two chips. Important: Use extreme care not to damage the logic board components.
4. Using the syringe, put a 0.15 to 0.175 cc dab of thermal grease, in the center, on the mating surfaces of both chips, as shown below.
Important: One syringe (922-7144) contains 0.3 to 0.35 cubic centimeters (cc) of thermal grease. That is enough for 0.15 to 0.175 cc of grease for each chip. Use half of the syringe contents per chip. You might find it helpful to use a felt-tip pen to mark the half-way point on the syringe before applying the first dab. Then you can empty the rest of the syringe contents on the remaining chip. Although the amount shown appears to be plenty of grease, this is the correct amount that has been tested and verified on the production line. Important: Avoid unnecessary contact with new thermal material, as dirt and body oils reduce the material's conductivity.
While centering the heatsink pads over the two chips, lower the heatsink onto the logic board and press on the areas where the screw brackets on the heatsink meet the standoffs on the board. Make sure the heatsink is level on the board before installing the screws.
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