Samsung LN19D450G1DXZA - Manual (Page 184)

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English
Issues Solutions and Explanations
The picture is good
but there is no sound.
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Set the Speaker Select option to TV speaker in the
Sound menu.
●
If you are using an external device, check the device’s
audio output option (Ex. You may need to change your
cable box’s audio option to HDMI if you have the box
connected to your TV using an HDMI cable.).
●
If you are using a DVI to HDMI cable, a separate audio
cable is required.
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Reboot the connected device by reconnecting the
device’s power cable.