Hi Sangs1234,
If I understand you correctly, you are trying to connect your laptop directly to your TV. You can connect using the HDMI cable. Ensure that you choose the input on the TV as HDMI. Then use the key combination 'Fn' + 'F1' or Windows key + 'P" to switch between the laptop screen and TV.
I would advise you to refer the user manual if you want to connect your LG Hard Disc Drive to the TV.
Hope this helps.