Replace your HDMI cable if it’s short, as it may cause the black screen issue
An HDTV normally has either 1080 or 720 rows and over 1,000 columns of pixels
Also for: 55lc55s240v69, 47lc55s240v87
Sleep timer activated- you may accidentally activate this mode causing the TV to
Having an image on your TV screen that doesn't fill the screen is frustrating
If your network connection is not up-to-mark, you can use a wired connection to initiate