The analysis can be carried out in the following ways:

1. First, we know the reason why the picture is silent: cool open TV connects to the computer with HDMI, which is a computer graphics card HDMI for audio and video output, so it is necessary to change the original default sound card driver on the motherboard of the computer system to HDMI graphics card audio driver.

2. open the "control panel" of the computer and enter "hardware and sound-sound". Or use the mouse to double-click the "Volume (Speaker)" icon in the lower right corner of the desktop.

3. Then, in the sound option, you can select the HDMI audio output as the high-definition audio output mode such as 7.1 channels. Then install and select the correct driver, and the problem will be solved. Extended information

Difference between HDMI and dp interface:

HDMI is a digital video/audio interface technology, which is suitable for special digital interface of image transmission, and can transmit audio and image signals at the same time, with the highest data transmission speed of 48 Gbps (version 2.1);

DisplayPort is also a high-definition digital display interface standard, which can connect computers and monitors as well as computers and home theaters. The bandwidth it can provide is as high as 1.8Gb/s, and sufficient bandwidth ensures the demand for higher resolution for large-size display devices in the future.

Reference: Baidu Encyclopedia -HDMI