Think of a scenario where you are using your TV as your PC monitor. That means 2 in 1 purpose. TV has no problem in running but you get occasional black screen for a few seconds.Or, you may get a much lower resolution of picture where everything will look bigger.
Generally updating graphic card driver doesn’t help in this kind of problem. So to fix the issue, change HDMI cable or power off TV as well PC,unplug the HDMI cable and keep it unplugged for a few minutes. Now plug the HDMI cable again to the same port or a different port. Power on both TV and PC .