LG 50PN4500 Owner's Manual page 32

The extended owner's manuals that contain
information on the advanced features of this LG
TV are located on the CD-ROM provided in an
electronic version.
To read these files, you will need to use the personal
computer (PC) equipped with a CD-ROM drive.
The model and serial number of the TV is
located on the back and/or one side of the TV.
Record it below should you ever need service.
MODEL
SERIAL