Thermal Grease - Lenovo x3650 M4 BD 5466 Installation And Service Manual

Thermal grease

The thermal grease must be replaced whenever the heat sink has been removed from the top of the
microprocessor and is going to be reused or when debris is found in the grease. Use this information to
replace damaged or contaminated thermal grease on the microprocessor and heat sink.
When you are installing the heat sink on the same microprocessor that is was removed from, make sure
that the following requirements are met:
• The thermal grease on the heat sink and microprocessor is not contaminated.
• Additional thermal grease is not added to the existing thermal grease on the heat sink and microprocessor.
Note:
• Read the Safety information on page "Safety" on page v.
• Read the "Installation guidelines" on page 30.
• Read "Handling static-sensitive devices" on page 32.
To replace damaged or contaminated thermal grease on the microprocessor and heat exchanger, complete
the following steps:
Step 1. Place the heat sink on a clean work surface.
Step 2. Remove the cleaning pad from its package and unfold it completely.
Step 3. Use the cleaning pad to wipe the thermal grease from the bottom of the heat sink.
Note: Make sure that all of the thermal grease is removed.
Step 4. Use a clean area of the cleaning pad to wipe the thermal grease from the microprocessor; then,
dispose of the cleaning pad after all of the thermal grease is removed.
Microprocessor
Figure 58. Thermal grease distribution
Step 5. Use the thermal-grease syringe to place 9 uniformly spaced dots of 0.02 mL each on the top of
the microprocessor. The outermost dots must be within approximately 5 mm of the edge of the
microprocessor; this is to ensure uniform distribution of the grease.
Figure 59. Syringe
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Lenovo System x3650 M4 BDInstallation and Service Guide
0.02 mL of thermal
grease