You bought a new TV or want to re-connect an antenna due to relocating the TV or moving.
How to fix
Connect the antenna terminal to the back of TV and wall antenna socket with a coaxial cable, activate auto tuning setting, then TV recognizes the channels automatically.
Antenna terminals are located at the back of the product, and their types vary depending on models.
Please refer to below picture to connect the antenna.
How to set channels automatically
※ Setting method/adjusting menu varies depending on models.
Menu → Channel → Auto tuning
Before 2013 smart TV
Menu → Setting → Channel → Auto tuning → Start
After 2014 webOS TV
Home → Setting → Advanced setting → Channel → Channel tuning → Auto tuning