How to set dynex from 480p to 1080p

[nucksfan51]

when i watch tv shaw 1080p cable box my dynex 46in tv is reading hdmi 480p, black bars top and bottom. or zoom mode whatever. then i change input to ps3 and my tv reads 1080p. what the heck. my other tv, 58in panasonic is getting repared so i switched them, same cables same spot but my panasonic would be 1080p on the shaw box and ps3. what am i missing.

 

[Guest]

Was wondering if you were able to switch to 1080p? I have Telus and I am having the exact same problem. Any information would be greatly appreciated...thanks.