Lenovo 4431HE1 User Guide
Table
3-2.
Troubleshooting
(continued)
Problem
Possible
cause
Suggested
action
Reference
Screen
is
blank
and
power
indicator
is
steady
amber
or
flashing
green
The
monitor
is
in
Standby/Suspend
mode
v
Press
any
key
on
the
keyboard
or
move
the
mouse
to
restore
operation.
v
Check
the
Power
Options
settings
on
your
computer.
“Understanding
power
management”
on
page
2-6
The
power
indicator
is
green,
but
there
is
no
image.
The
video
signal
cable
is
loose
or
disconnected
from
the
system
or
monitor.
Be
sure
the
video
cable
is
connected
with
the
system
properly.
“Connecting
and
turning
on
your
monitor”
on
page
1-
5
The
monitor
brightness
and
contrast
are
at
the
lowest
setting.
Adjust
the
brightness
and
contrast
setting
on
the
OSD
menu.
“Adjusting
your
monitor
image”
on
page
2-3
One
or
more
of
the
pixels
appear
discolored
This
is
a
characteristic
of
the
LCD
technology
and
is
not
an
LCD
defect.
If
there
are
more
than
five
pixels
missing,
contact
the
Customer
Support
Center.
Appendix
A,
“Service
and
Support,”
on
page
A-1
v
Fuzzy
lines
in
text
or
a
blurry
image.
v
Horizontal
or
vertical
lines
through
the
image.
v
Image
setup
has
not
been
optimized
v
Your
system
Display
Properties
setting
have
not
been
optimized.
Adjust
the
resolution
settings
on
your
system
to
match
the
native
resolution
for
this
monitor:
1280
x
1024
at
60
Hz.
“Adjusting
your
monitor
image”
on
page
2-3
“Manual
image
setup”
Perform
automatic
image
setup.
If
automatic
image
setup
does
not
help,
perform
manual
image
setup.
“Selecting
a
supported
display
mode”
on
page
2-5
When
working
in
the
native
resolution,
you
may
find
additional
improvements
by
adjusting
the
Dots
Per
Inch
(DPI)
setting
on
your
system.
See
the
Advanced
section
of
your
system’s
display
properties.
Chapter
3.
Reference
information
3-3
Manual image setup
If automatic image setup does not establish the image that you prefer, perform manual image
setup.
Note:
Note:
Have your monitor powered on for about 15 minutes, until the monitor warms up.
1. Press
at the bottom of the monitor to open the OSD menu.
2. Use
or
to select
and press to access.
3. Use
or
to select Clock and Phase adjustment.
•
Clock
(pixel frequency) adjusts the number of pixels scanned by one horizontal
sweep. If the frequency is not correct, the screen shows vertical stripes and the picture
does not have the correct width.
•
Phase
adjusts the phase of the pixel clock signal. With a wrong phase adjustment, the
picture has horizontal disturbances in light picture.
4. When the image no longer looks distorted, save the Clock and Phase adjustments.
5. Press
5. Press
to leave the OSD menu.