LG Monitor Installation Manual page 25

Remove L-brackets before Installation
 Remove the L-brackets from each corner of the monitor before installing it.
NOTE
 Keep the removed L-brackets and use them when moving the monitor later.
CAUTION
When you connect Monitor sets for multivision, you may find that the screen
color is not the same across all the Monitor sets. If you want to adjust
the screen color manually, please refer to the Installation Manual.
When you install multiple Monitor sets onto a wall, attach the IR Receiver
to all the sets, or use an RS-232C cable to connect them and then attach
the IR Receiver to the first set.