Microsoft Surface Laptop 7 (13.8-inch) Heat Sink Replacement

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Remove the old thermal paste

Before installing a new heat sink, you must remove all the old thermal paste from the CPU surface.
Use the flat end of a spudger to scrape up the old thermal paste from the CPU.
Use high concentration (more than 90%) isopropyl alcohol and a microfiber cleaning cloth to remove all the thermal paste residue from the CPU.
Don't touch the CPU or let any dust or debris settle on it—even a fingerprint can interfere with heat dissipation.
Wait for the isopropyl alcohol to dry completely before applying any thermal paste.

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