If the screen is ok for everything else except when watching a tv feed then the most likely thing is that the software is forcing the display into an output resolution that the laptop screen cannot display. There are a couple of things to look at. Are there any video settings that you can change in the app? Is there a different version you can try?
Try the windows key and the down arrow. Try the windows key and the up arrow. Try the windows key and D.
When the screen goes off, press ALT and f4 at the same time to exit the app. Try pressing f11 to break out of full screen mode. Press control-alt-del to see if that breaks out of the screen.
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