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Replace it if you want true HD. The TV has 640 × 480 pixels (dots) in use for 16:9 or 852 × 480 dots for 4:3. This translates to 480p or SD resolution.
You can watch an HD signal with downconversion. You will also need a digital to analog converter for OTA signals since the TV doesn't have a digital tuner (ATSC in the US) It reads NTSC, PAL, PAL60, SECAM, Modified NTSC signals in the following formats: 525 (480) / 60i · 60p, 625 (575) / 50i · 50p, 750 (720) / 60p · 50p, 1125 (1080) / 60i · 50i · 24p ·25p · 30p · 24sF ···· SMPTE274M, 1250 (1080) / 50i.
this should automatically be done by the tv. If you input to a standard def input (ie yellow plug) or are using standard def cable it will be 480. If u change to a HD input or an HD channel it should automatically switch to 1080. The input displayed on the tv that says 480i or 1080i is just a result of what is being played, not a setting to be changed.
480/720/1080 is a function of the XBOX not the TV. The TV cannot change the resolution. The resolution indication that shows on the TV is only what it is recieving, not what it is showing, You need to check the XBox or whatever you are using.
The Green Line on the other hand is a defect and if the TV is in warranty you should make them fix it!!! That is unless this green line only appears with a single source....it should show ALL the time.
if the cable box is sending in 1080 signal the tv will not be able to format to a 480 (you can switch to either/or)
the problem you have is if your not sending 1080 to the tv your not really watching HD but you cant strech the 4:3 (non HD channels) to the 16:9
the only thing you can do is run analog signal and a digital signal then switch between the two sorces for your HD and non HD programs