Using your LG TV original remote, adjust the input source to TV and pick one of the cable channels (other input sources may work, but TV works better when accessing the hidden menu).

I have a Harmony 890 and an older LG set which has the same peculiar input selection, but when I downloaded a code-package for the TV-set it had massive amounts of direct selection codes, most ...

Here's a lifehack for your smart TV: use this button combo to activate a secret menu that can do some cool stuff.