Replacing The Cpu - Lenovo B40–30 Hardware Maintenance Manual

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 base. Refer to "Removing the stand base".
Step 5. Remove the foot cover. Refer to "Removing the foot cover".
Step 6. Remove the stand holder. Refer to "Removing the stand holder".
Step 7. Remove the middle cover. Refer to "Removing the middle cover".
Step 8. Remove the EMI cover. Refer to "Removing the EMI cover".
Step 9. Remove the sealing tape between the system fan and heat-sink.
Step 10. Remove the nine screws that secure the heat-sink to the motherboard and chassis.
Step 11. Lift up the heat-sink to remove it.
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 12. 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 screws.
c. Use the sealing tape to seal the gap in-between the system fan and heat-sink.
Step 13. Reattach the EMI cover, middle cover, stand holder, foot cover and stand base.

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
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Chapter 7 Replacing hardware
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