Perform the following steps:

1. Ensure that the HUAWEI Vision is properly connected to an external signal input source (such as HDMI and AV).

2. Power on the HUAWEI Vision, go to Settings > Connections > Input source > Open default input on startup, and set the input source of the default playback window on the home screen to the currently connected input source.

3. After you have finished configuring the settings, press the Power button on the remote control, select Asleep, and then turn on the screen. Power off and then power on the Vision, or restart the Vision, and you will access the new default input source.

When the screen is turned off and then turned on after a non-input source is played in full-screen mode or on a screen for switching the input source, the full-screen playback screen of the input source will not be displayed.

After an STB is connected, only the navigation buttons, back button, and OK button on the remote control can work.