used to link your mobile device or computer to your Smart TV. How the Linking Code Works
On your phone or tablet, open the YouTube app, tap your profile/cast icon, and select Link with TV code to enter the code shown on the screen.
If your Smart YouTube TV app isn't working or is throwing playback errors, follow these steps to get it running again: 1. Switch to the Latest Stable Version (SmartTube)
Fortunately, there are several steps you can take to troubleshoot and potentially resolve the 617-740 code issue on your Smart YouTube TV: