Sony VGNZ890H - Manual (Page 100)

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Using Peripheral Devices >
Connecting an External Display
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You can adjust the screen resolution of the connected TV with your computer. See Why doesn't my screen display a video? (page 185) for more
information.
With the HDMI connection, the volume can be adjusted by the connected audio device only. Your computer has no control over the output volume of
any connected devices.