Handling Thermal Interface Materials; Type, Quantity, And Areas Of Thermal Interface Materials Application On The Heat Sink - Lenovo 100e Chromebook Gen 4 Hardware Maintenance Manual

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Table of Contents

5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that

pertain to replacement.

6. When replacing a FRU, carefully retain and reuse all screws.

7. When replacing the base cover, reapply all labels that come with the replacement base cover. If some

original labels are not included with the replacement base cover, peel them off from the original base

cover and paste them on the replacement base cover.

DANGER

Before removing any FRU or CRU, shut down the computer and unplug all power cords from

electrical outlets.

Attention: After replacing a FRU, do not turn on the computer until you have ensured that all screws,

springs, and other small parts are in place and none are loose inside the computer. Verify this by shaking the

computer gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short

circuits.

Attention: The system board is sensitive to and can be damaged by ESD. Before touching it, establish

personal grounding by touching a ground point with one hand or by using an ESD strap (P/N 6405959).

Handling thermal interface materials

Thermal interface materials are typically applied between a heat sink and a CPU (and/or GPU) die to enhance

the heat transfer capability of the heat sink. If thermal interface materials are exposed during computer

servicing, such as when replacing the heat sink or system board, it is important to handle the thermal

interface materials properly.

• You need to completely remove the old thermal interface materials from the CPU and/or GPU die.

• You need to apply new thermal interface materials onto the heat sink according to the type, quantity, and

application areas specified in this publication.

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