The network is working but the TV cable is not connected because the input mode of the TV has been switched to \"TV\" or \"RF\
The jack is not connected, of course, is \"unable to connect\". Use the TV remote control to switch the input mode of the TV to the interface that actually connects to the network set-top box, such as HDMI, you should be able to receive the signal from the network set-top box, at least there should be its startup screen.
One reason the cable TV is not connected is that the line is broken and can not be reached; Another reason is the problem of the cable itself, you can not contact, no matter what kind of cause, you can call customer service to consult, there is a problem so that the repairman can help you repair in time to watch TV normally.