Lenovo IdeaCentre A520 All-in-One - Manual (Page 56)

a. Raise the hinge, line up the rear cover with the LED panel and slide it back into position.
b. Press the edge of rear cover to lock the cover to the LED panel with the pins.
c. Slide the rear deco back into position.
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 scalar 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 scalar 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. Disconnect all the cables from the scalar board. 1 - 11
Step 8. Remove the 5 screws that secure the scalar board to the middle frame and lift it up to remove it.
L ED/CIR
LVDS
MMB
P owe r
Blue tooth
WLAN
Ca me ra
Conve rte r
Touch control
S ca la r
HDMI/DVI
Step 9. To install the new scalar board:
a. Line up the holes on the new scalar board with the mounting holes on the middle frame and
secure the new scalar board with the 5 screws.
b. Connect all the cables to the new scalar board.
50 IdeaCentre A520 All-In-One PCHardware Maintenance Manual