When connecting an external device (eg laptop) to a TV, you usually have to select the appropriate input using the TV's setup menu as it cannot switch to HDMI input automatically.
When connecting an external device (eg laptop) to a TV, you usually have to select the appropriate input using the TV's setup menu as it cannot switch to HDMI input automatically.
1. TV must be set to the correct hdmi channel manually. Most TVs can not switch automatically
2. Laptop must activate the HDMI output. Some laptops can not switch automatically