There's no signal on the TV vertical screen. Why?

When the TV has no signal, the screen may switch to portrait mode, which is usually caused by the following reasons:

1. Signal reception problem: If the TV does not have enough signal or the signal quality is not good, the screen may become portrait mode. This may be caused by bad weather, signal interference or signal source failure. Generally speaking, this problem can be solved only by adjusting the position of the signal receiver or changing the signal source.

2. Zoom setting problem: Sometimes the zoom setting of the TV may cause the screen to become portrait mode. If you accidentally change the zoom setting of the screen, it may cause the screen to display abnormally. You can solve this problem by adjusting the zoom setting of the TV.

3. Signal setting problem: Another possible problem is the wrong signal setting. If the TV is connected to a TV signal receiver instead of a digital signal receiver, it may be necessary to adjust the signal settings of the TV in order to receive the signal correctly and convert it into the correct format.

4. Data cable interface problem: Finally, TV sets with high-speed interfaces such as cable or HDMI may have data cable interface problems. If the connector is loose or damaged, the TV screen may have a vertical screen problem. This can usually be solved by ensuring that the data cable is connected correctly.

In short, when there is a vertical screen problem, we can check whether the signal reception, zoom settings, signal settings and data cable interface are normal, so as to find the root cause and take corresponding measures to solve the problem.