Lenovo C440 Touch All-in-One - Manual (Page 59)

c. Connect the power cable to the new power switch board.
Step 13. Reattach the EMI cover, middle cover, optical drive, stand holder, foot cover and stand base.
Replacing the motherboard
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 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 stand base. Refer to “Removing the stand base”.
Step 5. Remove the foot cover. Refer to “Removing the foot cover”.
Step 6. Remove the memory modules. Refer to “Replacing a memory module”.
Step 7. Remove the optical drive. Refer to “Replacing the optical drive”.
Step 8. Remove the stand holder. Refer to “Removing the stand holder”.
Step 9. Remove the middle cover. Refer to “Removing the middle cover”.
Step 10. Remove the EMI cover. Refer to “Removing the EMI cover”.
Step 11. Remove the rear I/O module. Refer to “Replacing the rear I/O module”.
Step 12. Remove the heat-sink. Refer to “Replacing the heat-sink”.
Step 13. Remove the CPU. Refer to “Replacing the CPU”.
Step 14. Remove the TV-Tuner card. Refer to “Replacing the TV tuner card”.
Step 15. Remove the WLAN card. Refer to “Replacing the WLAN card”.
Step 16. Unplug the following cables from connectors on the motherboard:
• Power switch board cable
• Speaker system cable
• Front control board cable
• Converter cable
• Camera cable
• System fan power cable
• Hard disk drive power cable
• Hard disk drive SATA cable (Black)
• Optical drive SATA cable (Red)
• Optical disk drive power cable
• LVDS cable
Chapter 8 . Replacing hardware 53