Lenovo L27m-28, User Manual

Chapter 3.       

 3-4

Manual image setup

If automatic image setup does not establish the image that you prefer, perform manual image 
setup. (For VGA [analog] only)

Note: 

Have your monitor powered on for about 15 minutes, until the monitor warms up.

1.

Press 

 to open the OSD menu.

2.

Use 

 or 

 to select 

 and press 

 to access.

3.

Use 

 or 

 to select Manual and press 

 to access.

4.

Use 

 or 

 to select 

Clock

 or 

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.

5.

When the image no longer looks distorted, press Enter to save the adjustments of 

Clock

and 

Phase

.

6.

Press  

 to leave the OSD menu.

The power 
indicator is amber, 
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 
Support Center.

Appendix A.“Service 
and Support”on page 

A-1

•

Fuzzy lines in 
text or a 
blurry image.

•

Horizontal or 
vertical lines 
through the 
image.

•

Image setup has not 
been optimized.

•

Your system 

Display Properties 
setting have not 
been optimized.

Adjust the resolution 

settings on your system to 
match the native resolution 
for this monitor: 1920 x 
1080 at 60 Hz.

“Adjusting your 
monitor image”on page 
2-3

Perform automatic image 
setup. If automatic image 
setup does not help, perform 
manual image setup. 

“Selecting a supported 
display mode”on page 
2-8

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.

Table 3-2. 

Troubleshooting

Problem

Possible cause

Suggested action

Reference