The specific steps are as follows:

1. First, turn on the Skyworth TV, as shown in the picture below, and then proceed to the next step.

2. Secondly, on the Skyworth TV remote control, press the signal source button selected in the frame below, as shown in the figure below, and then enter the next step.

3. Then, the signal source menu will appear on the TV screen, as shown in the picture below, and then proceed to the next step.

4. Then, when the menu appears, press the down button on the remote control, as shown in the picture below, and then proceed to the next step.

5. Finally, make a selection as needed, as shown in the figure below. In this way, the problem is solved.