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 | Yamaha RX-A3060 | Ascend Acoustics towers RAAL | Custom Ascend Horizon center | Rythmik F12 | Oppo BDP105 | Lenovo Windows 10 PC with Jriver media server streaming FLAC and WAV files | Surrounds - Def Tech Pro Monitor 1000s
Secondary system : Yamaha RX V2500 | Philharmonic AA bookshelf speakers.