Sony VAIO VGN-FZ Series User Manual page 165

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Troubleshooting
What should I do if I do not hear microphone sound from my HDMI-compatible TV?
!
This Q & A entry applies to models with the NVIDIA video controller only.
Your computer is not capable of outputting audio signals from the microphone jack directly through the HDMI port. Save the
audio data first to an audio file, and then play it back to output through the HDMI port.