See if you can update the drivers for your display adapter:
Plug your computer back into your TV to provide a screen. Access the Device Manager utility by typing '''devmgmt.msc''' into the Search box on your Taskbar and hit Enter. In the Device Manager window, find the '''Display adapters''' entry. Right-click your display adapter (“Intel UHD Graphics 620”, for example), and click '''Update driver'''.
Then restart your system.