There's No Sound Or There's A Problem With The Sound - SMART Board MX Series User Manual

Chapter 5 Troubleshooting
Symptom
The image is cut off or shifted to the
left or right.
The image doesn't fill the entire
screen.
A persistent image appears on the
display.
There's no sound or there's a problem with the
sound
Symptom
There's no sound.
OR
There is sound, but the volume is low.
OR
The sound is distorted or muffled.
There is a whine or buzzing sound
coming from the back of the display.
smarttech.com/kb/171554
Troubleshooting steps
Adjust any connected computers' video settings, particularly zoom, crop, and
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underscan.
See the computer's operating system documentation.
If you're using a VGA video input and any connected computers' desktops are
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entirely black, change them to dark gray or a different color.
If any connected computers' desktops are extended across multiple screens,
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duplicate the desktops across the screens or set the display as the only screen.
Adjust any connected computers' video settings, particularly overscan.
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See the computer's operating system documentation.
Make sure the connected computer's video connector is configured to output a
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supported video signal. See No video display output from a laptop.
See Image persistence or burn in on LCD displays.
Troubleshooting steps
If you're using an external audio system, make sure it is turned on.
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Make sure the cables connecting the display to the computer are securely fastened.
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Notes
The display's stereo 3.5 mm in connector works with the VGA input only.
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Connecting an audio cable to the display's stereo 3.5 mm out connector
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disables the internal speakers.
If you're using the display's S/PDIF out connector to connect a sound bar
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or receiver for external speakers, see the SMART Board MX (V2) and MX
(V2) Pro series interactive displays installation and maintenance guide
(smarttech.com/kb/171555).
If you're using the display's stereo 3.5 mm out connector, adjust the volume on the
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display and the connected computer and make sure neither are muted.
If you're using the display's S/PDIF out connector, adjust the volume on the external
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audio system and make sure the audio system isn't muted.
Adjust the display's audio settings.
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If you're using the integrated speakers, set the volume for the computer and any
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running applications to 80%, and then adjust the display's volume.
OR
If you're using an external audio system, set the volume for the computer, any
running applications and the display to 80%, and then adjust the external audio
system's volume.
Be aware that these sounds are normal. All displays emit some electrical noise.
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Such sounds may be more noticeable with some displays than with others.
However, if you hear noise from the front of the display, further investigation is
required.
Connect all devices to the same power outlet or power bar.
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