LG 47LM9600 Owner's Manual page 204

Problem
Subtitle is not displayed.
Image shown may differ from your TV.
For information on requesting service, refer to the TV's menu.
HOME Settings
Verify that the file replays normally on the video player in
the computer. (Check for damaged files.)
Check if the video file shares the same name with the
subtitle file.
Verify that the video and subtitle files are placed in the
same folder.
Verify that the subtitle file format is supported.
Verify that the subtitle language is supported. (Open the
Product/Service Info.
Solution