Did you try a hard reset? What about using a speaker microphone? Those would be the two things I try to determine if it is a dead speaker, or dead receiver.
Look on the TH-D72 user group on Yahoo. There have been issues with the speaker disconnecting. It is on spring contacts to the board and it goes intermittent.
Craig
Look on the TH-D72 user group on Yahoo. There have been issues with the speaker disconnecting. It is on spring contacts to the board and it goes intermittent.
Craig