First, read the English article below.

For older connections, it is recommended that you turn your laptop off when connecting to a TV. For HDMI connections, you do not need to turn your laptop off.  Some TVs will attempt to compensate for different aspect ratios by zooming the image. If you find that your screen is cut off around the edges when you are viewing on the TV, check your TVs settings to make sure that it is not zoomed in. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Tắt laptop. Nối cáp video từ cổng video đầu ra của laptop đến cổng video đầu vào trên TV của bạn. Điều chỉnh mức phóng đại của TV.