Can you confirm the LG Display you are using is on the recommended Hardware List for webOS displays? If the Display you are using is not on the list, it will not be supported by Xibo.
If your monitor is on the Hardware List, please send a screenshot of the Status page on the Display. You can access the Status page by clicking the OK, Enter or Select button on your remote control while the Xibo app is running and choose Status from the Action Bar at the top of the screen.
You are welcome to send the Status screenshot to me in a private message.
Many Thanks.