Have TV Questions? Ask a TV Technician
Hello and sorry you're having problems.
By far the most common cause of this problem, is a glitch in the cable box processing.
Please follow the steps below:
1) Shut the TV off, and then disconnect the cable/SAT box from power.
2) If using an HDMI cable, disconnect and reconnect the HDMI cable on both ends when the cable box is unplugged from power (make sure it's secure on both ends).
3) Plug the cable box back into power, and once it's rebooted, turn the TV on and attempt to watch a program.
This should restore the sound. However if it does not, try the reboot once more.
Since you have sound with DVD, the most common cause of this is the cable box.
I don't use the phone call feature, so imply try those instructions and reply back with the result.
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Do you need further assistance with this?