Step1：Check whether connect the audio cable from PC.
Reason：VGA cable only carries video and picture information, no audio information.
Solution：Connect audio cable from PC
Step2: You need to select “PC” using the source button on you remote.
Reason：Select the correct source
Solution：Select the PC source, alternatively connect your TV using a HDMI cable if you PC have a HDMI connector, HDMI is both audio and video.