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Function test
After repair, be sure to confirm that all functions are working.
Table 4-1:
Test item
HDMI test
DP test
D-SUB test
Audio test
Support and troubleshooting
The following table lists possible problems, the possible cause or each problem, and the recommended
solutions.
Table 4-2:
Problem
Screen is blank or
video is flashing.
Image appears
blurred, indistinct, or
too dark.
No speaker volume
or low speaker
volume.
24
Function test
Operating description
Confirm whether image displays and sound plays
correctly on the monitor.
Confirm whether image displays and sound plays
correctly on the monitor.
Confirm whether image displays and sound plays
correctly on the monitor
Change volume and balance to confirm whether volume
is smooth and loud enough.
Solving common problems
Possible cause
Power cord is disconnected.
Monitor is off.
Video cable is improperly connected.
System is in Sleep mode.
Video card is incompatible.
Brightness is too low.
Volume control is turned down.
Volume is muted.
Volume is turned down in the OSD.
Tool used
Computer or DVD player
Computer or DVD player
Computer or D-SUB
player
Speaker
Solution
Connect the power cord.
Power the power button.
NOTE: If pressing the Power button
has no effect, press and hold the
power button for 10 seconds to
disable the Power button lockout
feature.
Connect the video cable properly. See
Connecting the cables on page 7 for
more information.
Press any key on the keyboard or
move the mouse to exit Sleep mode.
Open the OSD menu and select the
Input Control menu. Set Auto-Switch
Input to Off and manually select the
input.
Open the OSD menu and select
Brightness to adjust the brightness
scale as needed.
Adjust the volume control on the
bottom left of the front panel.
Press up on the volume control to
unmute the volume.
Open the OSD, select Audio Control >
Volume, and adjust the volume scale.
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