Replacing The Cpu - Lenovo 90H9 Hardware Maintenance Manual

Step 1. Remove the computer cover. Refer to "Removing the computer cover".
Step 2. Push the graphic card lock as shown to unlock the graphic.
Step 3. Disconnect the power cables from the graphics card.
Step 4. Turn the locking pin counterclockwise 90°, then slowly take it out.
Step 5. Push the locking pin that locks the graphic card to the motherboard
then lift the card straight up to remove it.
Step 6. To install the new graphics card:
a. Attach the new graphics card to the same adapter connector.
b. Connect the power cables to the new graphics card.
c. Turn the graphics card latch to the closed position and secure it with
the locking pin.
Step 7. Reattach the computer cover.

Replacing the CPU

Note: For this procedure, it helps to lay the computer flat.
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Chapter 8. Replacing hardware
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