Unplug the power to the external device for 30 seconds.
Lg tv not connecting to cable box.
Press the smart button on the remote control and select settings option set the universal control on the tv menu press wheel or enter to continue.
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.
Make sure the other end is secure in the cable box.
Some users have had success using the lg bluetooth rolly keyboard but this is not officially supported.
Disconnect the hdmi cable from the tv and move it to an alternate port.
Plug the device back in and power the device back on.
Bluetooth mice and keyboards are not supported.
Simply connect your usb cable s to any available usb ports on the tv.
Change the tv to the new hdmi input to see if the issue.
Now please try this.
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.
Check that the external device is connected to the tv with an hdmi cable and is powered and switched on.