Toshiba Satellite L855D S5117 Laptop
No idea what "serial" means in regard to video.
Your laptop does 720p through hdmi.
The issue is with your TV, which of course you didn't describe.
When you have two things that are not working together, why wouldn't you say what model your TV is?
You have to select the HD (HDMI) output in the laptop OS as well.
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