Sony VGN-FW170J - Manual (Page 165)

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Troubleshooting
What should I do if I do not hear built-in microphone sound from output devices?
Your computer is not capable of outputting audio signals from the built-in microphone directly to output devices. Save the
audio data first to an audio file, and then play it back to output from the output devices.
What should I do if I do not hear external microphone sound from my HDMI-compatible
TV?
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.