HP V28 4K - Function test; Support and troubleshooting

20
4) Solder the new component.
Function test
After repair, be sure to confirm that all functions are working.
Support and troubleshooting
The following table lists possible problems, the possible cause or each problem, and the
recommended solutions.
Function test
After repair, be sure to confirm that all functions are working.
Table 4-1: Function test
Te
st item
Operating description
Tool used
HDMI test
Confirm whether image displays and sound plays
correctly on the monitor.
Computer or DVD player
DP test
Confirm whether image displays and sound plays
correctly on the monitor.
Computer or DVD player
Audio test
Change volume and balance to confirm whether
volume is smooth and loud enough.
Speaker
Table 4-1: Function test
Test item
Operating description
Tool used
HDMI test
Confirm whether image displays and sound plays
correctly on the monitor.
Computer or DVD
player
DP test
Confirm whether image displays and sound plays
correctly on the monitor.
Computer or DVD
player
Audio test
Change volume and balance to confirm whether
volume is smooth and loud enough.
Speaker
Table 4-2: Solving common problems
Problem
Possible cause
Solution
Screen is blank or
video is flashing.
Power cord is disconnected.
Connect the power cord.
Monitor is off.
Press the monitor power button.
NOTE: If pressing the power button has no
effect, press and hold the power button
for 10 sec to disable the Power Button
Lockout feature.
Video cable is improperly connected.
Connect the video cable properly. For
more information, see Connecting the
cables on page 8.
System is in Auto-Sleep Mode.
Press any key on the keyboard or move
the mouse to inactivate the screen
blanking utility.
Video card is incompatible.
Open the OSD menu and select the
Input menu. Set Auto- Switch Input
to Off and manually select the input.
or
Replace the video card or connect the
video cable to one of the computer’s on-
board video sources.
Image appears
blurred, indistinct, or
too dark.
Brightness setting is too low.
Open the OSD menu, and select
Brightness to adjust the brightness scale
as needed.
“Check Video Cable”
is displayed on the
screen.
Monitor video cable is disconnected.
Connect the appropriate video signal
cable between the computer and monitor.
Be sure that the computer power is off
while connecting the video cable.
“Input Signal Out of
Range” is displayed
on screen.
Video resolution and/or refresh rate are set
higher than the monitor supports.
Change the settings to a supported
setting (see Preset display resolutions on
page 22).
The monitor does not
enter into a low-power
sleep state.
The monitor's power saving control is
disabled.
Open the OSD menu and select Power,
select Auto-Sleep Mode, and then set
auto-sleep to On.
“OSD Lockout” is
The monitor's OSD Lockout function is
Press and hold the Menu button for 10