Replacing The Cpu - Lenovo S40–40 Hardware Maintenance Manual

Step 7. Remove the nine screws that secure the heat-sink to the motherboard and chassis.
Step 8. Remove the heat-sink by lifting it up.
Attention: Place the heat-sink upside down on a flat surface to prevent thermal grease from contaminating
other components.
Attention: Use an alcohol pad to wipe the thermal grease off the CPU.
Step 9. To install the new heat-sink:
a. Line up the new heat-sink with mounting holes on the motherboard, then place it into position.
b. Follow the numbers printed on the new heat-sink to secure it in order using the nine screws.
Step 10. Reattach the motherboard cover, hinge fixing bracket, back cover and stand.

Replacing the CPU

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo
recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches
or other damage.
To replace the CPU
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the stand and back cover. Refer to "Removing the stand and back cover".
Step 5. Remove the hinge fixing bracket. Refer to "Removing the hinge fixing bracket".
Step 6. Remove the mother board cover. Refer to "Removing the mother board cover".
Step 7. Remove the heat-sink. Refer to "Replacing the heat sink".
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Lenovo S40–40Hardware Maintenance Manual