76 - PowerBook G4 (17-inch) Take Apart Logic Board
4. Use a black stick to remove all the original thermal material on the heatsink at the
locations shown below.
5. Vigorously clean remaining residue and adhesive with an alcohol pad.
Warning: Whenever the logic board is separated from the heatsink, you must
remove all existing thermal material and install new thermal material to the heatsink
at the three locations shown above. Failure to do so can cause the computer to
overheat and be damaged.
Important: If a replacement logic board comes with thermal pads installed, you will only
need to install Thermal Gel (922-5929) to the center surface of the heatsink.