Lenovo C540 Touch All-in-One - Manual (Page 46)

Step 9. Disconnect the four cables from the converter 1 2 3 4 , and then remove the three screws that
secure the touch control board to the chassis.
Step 10. Lift up the touch control board to remove it.
1
2
3
4
Step 11. To install the new touch control board:
a. Line up the holes on the new touch control board with the mounting holes on the chassis
and secure it with the three screws.
b. Connect the four cables to the new touch control board.
Step 12. Reattach the middle cover, optical drive, stand holder, foot cover and stand base.
Removing the EMI cover
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 EMI cover
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”.
40 Lenovo C540Hardware Maintenance Manual