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Make sure that the sound output connectors (the red and white ones) are correctly plugged in (the colours corresponding at both ends of the 3-headed cable) and that the sound volume in the ATT box is almost to the max.
Sounds like you have a tuner or an antenna problem. If you are using a DVT converter box to watch off the air TV, the signal has to be very good to get sound and picture. Try connecting a VCR or a DVD player trough the coax cable and see if it you get sound an pic on Channel 3 or 4. If you do, it is an antenna problem.
If sound works with the DVD, it shows your TV is fine, there is just something wrong with the sound signal getting from your cable box to the TV.
There are a few options here.
1) If you are using a single coaxial cable to connect the TV to the cable box, you can either try another one, or try the 3 component cables.
2) If you are using the 3 component cables, you should have more than one input row to the TV... try an adjacent row
3) If that doesn't work for the 3 component cables, try a new set of component cables.
4) Check the sound settings on the cable box itself. Maybe resetting the cable box will get it to go through the initialization sequence to get the sound set up correctly
Since the set will give sound from a DVD, at least the TV's audio amplifier is working. I'm ready to say you have a bad tuner, but I'm not absolutely certain. There may be trouble in the TV's audio processing stages. Or you could have something set wrong.
First, check the TV settings to be sure you have it set for the right tuning system and that the audio is set for normal. If the settings are right, try tuning in something besides the cable. If you have a VCR with RF output (that is, one that outputs on channel 3 or 4), hook that up and check for normal sound on that channel. If there is still no sound, your TV is at fault and would need service.
In order for the TV to work with the cable box by using a piece of coax and tuning the TV to channel 3, you must make sure the TV is in "Cable" mode on the tuner and not "AIR or Antenna" the frequency maps are different between these types of service and channel 3 cable will not be the same as channel 3 on Air or UHF/VHF.
Often there is an auto program feature on TV's that will "scan" for all available channels, and this should select the proper input type.
Try plugging your cable box in using a/v cables (red,white,yellow) and see if you have a picture on a different input from the box. If so, go into your general settings in the box and change the output channel to 4 instead of 3. Then try your TV on 4 and see if your picture comes in. I have seen TV tuners go out on just one channel before.