I presume you are connecting the laptop to the Samsung HDTV via an HDMI cable? If so, you have one option only that I am aware of- to dim the HDTV display as low as possible somehow.
Let us know if that works.
Another option could be for you to add a small bluetooth speaker. TV sound via built in speakers certainly is nothing special, so there would be no loss there really.
I have a pastry shop and i wanted to get some nice music going during the afternoon. Since i dont have a sound system i have to work with my laptop and my Tv to get that going. I tried and it works perfectly, but i dont want the tv showing what im doing on the laptop what can i do?