Hi there and welcome
you mean you have removed your Set Top box (lg lst4100-a) and you want to now just use the TV by itself via the Arial Cable? And you do not have a remove for the TV to tune it?
Is this what you are referring to?
Please let me know.
On the front at the bottom of the TV is the menu button, press this and then use the channel buttons to cycle through the menu items.
Choose Setup, then EX Scan and this will initial the scanning for the channels (make sure of course the Antenna cable is connected to the TV).
Once done, you can use the channel up and down buttons also at the front of the TV to switch channels.
In addition, you can get a replacement remote for this TV here, as you will likely want to again use a remote
If you any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.