Replacing The Motherboard - Lenovo 10140/90AC Maintenance Manual

Step 11. Reattach the computer cover.

Replacing the motherboard

Note: For this procedure, it helps to lay the computer flat.
To replace the motherboard:
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 computer cover. Refer to "Removing the computer cover".
Step 5. Remove the memory module. Refer to "Replacing a memory module".
Step 6. Remove the heat-sink and fan assembly. Refer to "Replacing the heat-sink and fan assembly".
Step 7. Remove the CPU. Refer to "Replacing the CPU".
Step 8. Remove the graphic card. Refer to "Replacing the graphic card".
Step 9. Remove the Wi-Fi card. Refer to "Replacing the Wi-Fi card".
Step 10. Disconnect the all cables from the connectors on motherboard.
Step 11. Remove the eight screws that secure the motherboard to the chassis.
Step 12. Slide then lift up the motherboard to remove it.
Step 13. Install the new motherboard:
a. Line up the holes on the new motherboard with mounting holes on the chassis and secure
it with screws.
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Chapter 8 Replacing hardware
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