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Question: HDR-HC9 audio

I've have an HDR-HC9 for more than a year with no problems until recently. There is no audio from the internal speaker during play back or when connected to a tv with the hdmi cable. There is sound when importing with Picture Browser. I have adjusted the volume cam wheel and the audio-mix with no luck. Is there some way that I could have muted the audio for playback? The manual has no references to this.
Thanks in advance,