Do you have both TVs connected to different cable boxes? If so, have you tried connecting the Sharp to the same cable box the Sony is connected to? If the Sharp also says 1080i on that box, then it must be a setting on the Sony. If you would have given the model of the Sony then someone could download the user manual and help you. But regardless of the user manual, I have 4 1080p TVs and none of them have setting to choose the resolution. When all of them are connected to cable boxes, they all say 720p on stations that broadcast 720p and they say 1080i on those stations.
I have an old Sharp Aquos LC-45GD6U which was the one of the first 1080p TVs sold in the USA. I also just bought a new 32" Sony LCD which is 1080p. They are both connected to Time Warner Cable. Whenever I turn on a channel both sets indicate either 480i for a non-HD program or 720p or 1080i for HD broadcasts.
My question is why for the exact same program being broadcast on the same channel over the same cable system, one TV set will indicate 720p while the other one will indicate 1080i? For example right now channel 765 (NatGeoHD) indicates 720p on the Sharp Aquos set and 1080i on the Sony set.
Anyone know why this is?