Picture is reading 1080i from the comcast box
You have to enter its service mode to change its video resolution.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
SOURCE: ilo 42" plasma tv
Go the the settings on the cable box. look for output resolution, then change it to 1080i and 720p. now turn the box off and back on your tv will now display the input of wither 1080i or 720p depending on the hd channel your watching.
SOURCE: HDMI problem
Set your 4:3 to stretch mode, see this link
www.hightdefforum.com/showthread.php?t=24734
SOURCE: adjusting the resolution from 480i to 1080i
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
SOURCE: when I set resolution at 1080i .why does it change
You need to post more information about your TV. A model number would help
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