Sony VGN-Z790D - Manual (Page 98)

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Using Peripheral Devices >
Connecting an External Display
!
If a device driver other than the one provided by Sony is used, the image will not be displayed and the audio will not be heard. Always use the device
driver provided by Sony for updates.
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See the manual that came with your TV for more information on installation and use.
The HDMI cable carries both video and audio signals.