It depends on which input you are using, but the HDMI inputs are auto detecting. Most likely whatever device you have connected is not putting out a 1080i signal, and needs to be configured to do that. Once you do, you should see the input icons on the top right briefly come up, and below the input number, you should see "1080i"
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You don't. The TV picture will be fuzzy when watching a program in 480. If you have a lot of video in 480 or 720 you can get an up scaler. They are expensive, but that is the only way you'll ever get a Hi def picture from a low resolution signal
Typically TVs will auto adjust to the input signal it receives. If your cable box is only outputting 480i then all the tv will show is 480i. Ensure you have a good 1080i signal going in to the unit and check again
Do you have a digital HD box from your provider? If so you need to turn the tv off, power down the box and press simultaneously the top 2 buttons on the box, this brings up a screen on the tv follow the directions to reset. Hope this helps
You Can Not Change. The TV Recognize the signal on the INPUT.
If the signal is 480i than the tv shows 480i
If the signal is 1080p than the tv shows 1080p (if supported)
If you try with your areal antenna (for now digital broadcast is maximum 1080i (in USA) The TV itself doesnt "upconvert" lower resolution signals.
If your using a HD converter box, there is usually a blink when switching from an HD channel to a non HD channel. It is just adjusting from different pictures modes such as changing from a 480i channel/show to a 1080i channel. If this is the case, its perfectly normal.