Removing The Rear Cover - Lenovo A540 Maintenance Manual

Step 5. Disconnect the touch and LED panel cables from the connectors on the motherboard.
Step 6. Remove the 6 screws that secure the hinge to the chassis
from the chassis.
Step 7. To reattach the hinge to the chassis:
a. Line up the hinge with the chassis and slide the hinge into position.
b. Secure the hinge to the chassis with the 6 screws.
c. Reconnect the touch and LED panel cables to the motherboard.
Step 8. Reattach the base cover and secure it with the screws.

Removing the rear cover

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
To remove the rear cover
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Lenovo A540/A740Hardware Maintenance Manual
2
2
1
1
, then raise the hinge to remove it