Lenovo IdeaCentre A520 All-in-One - Manual (Page 58)

c. Line up the new touch control board with the mounting marks on the middle frame, then
stick it to the middle frame.
Step 10. Reattach the rear cover to the LED panel.
Step 11. Reattach the hinge to the chassis, and reconnect the scalar headphone input, scalar and DVI/HDMI
cables to the motherboard.
Step 12. Reattach the base cover and secure it with the screws.
Replacing the converter board
Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the base cover.
To replace the converter 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 base cover. Refer to “Removing the base cover”.
Step 5. Remove the hinge from the chassis. Refer to “Removing the hinge from the chassis”.
Step 6. Remove the rear cover. Refer to “Removing the rear cover”.
Step 7. Remove the 4 screws that secure the converter board to the middle frame.
Step 8. Disconnect the 2 cables from the converter board.
Step 9. Lift up the converter board to remove it.
52 IdeaCentre A520 All-In-One PCHardware Maintenance Manual