How do I put my LG Television back to factory settings?

How do I put my LG Television back to factory settings?

The hard drive on my LG Television model no 42pt85 is full, so i need to put it back to factory settings, please tell me how.

ANSWERS:

@dickheads the easiest would be to just format the drive. This will erase all the data on it while leaving the rest of your TV alone.