When I change the channel on my TV (about 10 years old) the program stays the same. I can tell that the channel is changing, but the TV continues to show the same programing on all channels. If I wiggle where the cable connection going into the TV then the program will change to the appropriate channel.
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Lots of possibilities. If you are using the remote, try also using buttons on the TV to change channels. If TV buttons work, the remote is broken or perhaps try changing batteries and cleaning battery contacts on the remote. If neither work, lots of other things to try. You may need to set preselect channels, so your TV thinks there is only one channel out there until you do. If you are on a cable box you just need channel 3 and change channels on the cable box. I can't tell what you mean by "audio changes with the channel" ... if you mean that when you try to advance channels, it increases volume and moving down in channels lowers volume that would be strange -- if you are using a programable remote it might not be set correctly (try another programming code). The "blurred" picture is probably symptomatic of having the set on the wrong channel, and if you could set channel it might clear up ... I'd start with getting channels to change. If you need more help, give the brand and model of TV, say if you are using a remote (original or programable), and what the 'audio changes' comment means in more detail. Probably worst case is that your tuner circuit is fried, but don't assume that without more diagnostic.
some tv's default to channel 2 after being unplugged.since it is a older tv ,the buttons on the remote and the tv maybe worn down.on the tv itself try pushing the buttons down a liitle harder. if you have aux or line in/video inputs,scroll down on the channel button to log into a aux channel for the dvd player.as for the remote try buying a cheap universal remote to see if that works.
It's possible that V-chip is locked.. Go to the menu and see if the lock option is active... The backdoor password is 0-7-1-1 twice.. Entering it the first time, if it times out, will display "incorrect" just enter it again and it should ask you for a new password..
If that's not it let me know and we'll try a couple other things.
Sounds like it lost programing, if it has an "auto program" feature try that, or some older models need it to be done manualy and have a "add/erase" feature, instructions for that should be in your owner's manual.