Hi Grassman,
Yes, you can utilize the Autorun Last App feature to automatically start the last app you used once the TV is turned on. To enable this feature, follow the steps below:
1) Navigate to Settings > General > Smart Features > Autorun Smart Hub
2) Enable the Autorun Smart Hub feature
3) Navigate to Settings > General > Smart Features > Autorun Last App
4) Enable the Autorun Last App feature
~Samsung Advisor