I think the display should be 1080iHD 16:9. That's what mine says and it's fine. I don't think 4:3 is the correct ratio. What source do you use? Cable/satellite. When I first connected my TV, the cable box was set to 720p. I had to call Comcast, they walked me through how to set it to 1080i.
Main system: Sony 930D 65 inch, Receiver - Yamaha RX-A3060, Front speakers - Ascend Acoustics towers with RAAL tweeters and a custom Ascend horizon center channel. Source - Oppo BDP105 and Lenova Windows 10 PC with Jriver media server. Surrounds - forthcoming..