NEC MultiSync EA193Mi User Manual page 21

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No Sound
Make sure the speaker cable is proper connected.
Check to see if mute is activated.
Check the VOLUME in the OSD menu.
Check selected OSD's Tools to "SOUND INPUT", when DisplayPort is in use.
Brightness variations over time
Change AUTO BRIGHTNESS to OFF and adjust brightness.
NOTE:
When AUTO BRIGHTNESS is set to ON, the monitor automatically adjusts brightness based on the environment.
When the brightness of surrounding environment changes, the monitor will also change.
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