Try connecting a different device to the tv or the same device to a different tv maybe the other devices causing the issue.
Lg tv will not connect to cable box.
Hard line to the modem.
Some users have had success using the lg bluetooth rolly keyboard but this is not officially supported.
Now please try this.
Try using a different hdmi cable sometimes cables can short out or degrade over time.
Try connecting the hdmi cable into a different input port maybe the port is malfunctioning.
Bluetooth mice and keyboards are not supported.
This lets us test the tv connection to see if the tv is able to connect to any other signal.
The available controls will be shown on the bottom right hand corner of the tv screen when the set top box is selected.
Connect an hdmi cable with an adapter if necessary into your computer and connect the other end into the desired hdmi in port on the tv.
This lets us see if the tv is able to recieve a.
Then use the remote to navigate to home and then select source.
If you have a smart phone with a hot spot and at least 3 bars of signal try to connect the tv to the hot spot.
A cable or satellite set top box can be controlled with the lg tv magic motion remote control.
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If the tv continues to display the no signal message the cable box may be malfunctioning.
Simply connect your usb cable s to any available usb ports on the tv.
Using an ethernet cord connect to the router directly to the tv.
Make sure the cable is properly attached.
From there select the pc as the video source.
Disconnect the cable box from power for 10 seconds to reboot it then plug it back in.
Not all of the set top box controls will be available.
Shut the tv off and securely connect the cable box hdmi cable to hdmi 1 on the tv.