On all tvs there is a menu pannel find the menu button on the remote or tv could also be called setup button look for channel option or antena cable option (no on most of the new tvs it is an auto scan) and select that option it will scan throught the channels and auto add the ones that get reception say if ur using an antena
if u are trying to hook up a cable box or sat box through the antena coail wire at the same time u can not have them on so to scan for antena channels turn off the sat recver and cable box scan for channels because the sat box and cable box destors the singnal when on the same time with the antena u will proble have to go back into the main menu where yu selected the channels and manualy add channel 3 or 4 which is what runs the sat/cable box if ur using the antena hookup on the tv
if u are hooking the sat/cable box or dvd player to red gren blue or yellow white red hook up's they will be under a diffrent source chanel which u can usaly get to by hitting the input or source button on the remote
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