The problem of your unit has to possibility first the connection at the back of your unit specially the input output of the receiver or the receiver itself try to use dvd and play a movie, if producing sound the problem is the receiver. Feel free to send feed back good day and best regards.
1. check input sound connection
2. check audio mute or not
3. check audio system in menu
4. check speakers (connect external speakers)
5. check amplifier IC bad or not
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