Lenovo C440 Touch All-in-One - Manual (Page 58)

Step 14. Reattach the speaker system, EMI cover, middle cover, optical drive, stand holder, foot cover
and stand base.
Replacing the power switch board
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 power switch board
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 optical drive. Refer to “Replacing the optical drive”.
Step 7. Remove the stand holder. Refer to “Removing the stand holder”.
Step 8. Remove the middle cover. Refer to “Removing the middle cover”.
Step 9. Remove the EMI cover. Refer to “Removing the EMI cover”.
Step 10. Remove the screw that secure the power switch board to the front bezel.
Step 11. Disconnect the data cable from the power switch board, then lift up the power switch board.
Step 12. To install the power switch board:
a. Line up the hole on the new power switch board with the mounting hole on the front bezel,
then place it into position.
b. Secure the power switch board with the screw.
52 Lenovo C340/440 SeriesHardware Maintenance Manual