Bluetooth mice and keyboards are not supported.
Lg tv not connecting to cable box.
Now please try this.
Plug the device back in and power the device back on.
Disconnect the hdmi cable from the tv and move it to an alternate port.
Check that the external device is connected to the tv with an hdmi cable and is powered and switched on.
Once the box has rebooted turn the tv on and use the lg remote s input button to select hdmi 1.
Shut the tv off and securely connect the cable box hdmi cable to hdmi 1 on the tv.
Perform the following steps if the no signal message remains.
If your remote has an input source button press it and choose the input from the list that matches where your device is connected.
Some users have had success using the lg bluetooth rolly keyboard but this is not officially supported.
Disconnect the cable box from power for 10 seconds to reboot it then plug it back in.
Make sure the other end is secure in the cable box.
If your remote does not have an input source button press the home button then look in the upper right corner of the tv for the input icon and click it.
Unplug the power to the external device for 30 seconds.