Acer AT4220A Service Manual page 50

Release the two screws holding the IR board then detach the IR board.
17.
Release the three screws holding the button board then detach the function board.
18.
Detach function key.
19.
Disconnect the LVDS cable and release the four screws holding the PCB tray.
20.
Then remove the PCB tray with LVDS cable.
21.
44 Chapter 2