The LG G Flex2's micro USB port uses the SlimPort adaptor standard. To connect to an HDTV, you will need a SlimPort adaptor and seperate HDMI cable.
Connect your device to theSlimPort adaptor.
Note: SlimPort may require a power source. Please refer to manufacturer for instructions.
Finally connect the HDMI cable to your HDTV and SlimPort adaptor.
You will need to change the input of your HDTV to the correct HDMI input.
Note: Some SlimPort adaptors are made for specific devices. Check that the adaptor you purchased is compatible with your device.