HDMI Port on your laptop is HDMI Out and not HDMI In. So your laptop won't take input from the Set Top Box. As the HDMI port of your laptop can only give output to another Device. Users can purchase HD PVRs or TV tuners for their computers. These
Aug 19, 2019 How to Connect Your Laptop to Your TV - PCMag.com Depending on where your TV is, where your computer is, how your home is set up, and what media you plan to consume, you need to consider exactly how to connect your laptop to your TV. How to Use Your TV as a Second Monitor for Your Computer Jan 27, 2020
Sound coming from Laptop and not TV when connected to HDMI
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