1, check whether the signal is connected and the connector behind the TV is loose. 2. Press the TV/AV key or menu item on the remote control panel to select whether the signal input source is in good condition.

If the above two conditions are confirmed, there is no problem. You need to start the machine and check it. If there is no signal input, it is easier to be suspected. It often happens that the integrated block in the tuner part is broken. Send it for repair.