New Sony TV as a second monitor

[Alcony Brito]

I just bought the new 55" Sony OLED Master A9G model for video editing and is not working as a second monitor for Premiere to show my full screen. I dont know what to do now. 

[Peru Bob]

Try updating or rolling back your graphics driver directly from the video card manufacturer’s site.

[Alcony Brito]

I'm using iMac

[Michael Grenadier]

telling us you have an imac is not enough info

Please tell us your system specs: OS version, Premiere version, amount of RAM, Hardware specs including graphics card

Does the sony show an extension of your desktop before you launch premiere?  

If you have a relatively recent imac with usb3 or thunderbolt, you might consider getting a intensity pro interface from blackmagic to feed the sony monitor.  Nice little gizmo...  not horribly expensive.