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 your PC has a HDMI connector, HDMI can transport digital video and digital audio together.
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