Lenovo 4431HE1, L1900p manual Manual image setup

Table 3-2. Troubleshooting (continued)

Problem		Possible cause		Suggested action	Reference
Screen is blank		The monitor is in		v Press any key on the	“Understanding power
and power		Standby/Suspend		keyboard or move the	management” on page
indicator is		mode			2-6
				mouse to restore
steady amber or
				operation.
flashing green
				v Check the Power
				Options settings on
				your computer.
The power		The video signal		Be sure the video cable is	“Connecting and turning
indicator is		cable is loose or		connected with the	on your monitor” on
green, but there		disconnected		system properly.	page 1-5
is no image.		from the system
		or monitor.
		The monitor		Adjust the brightness and	“Adjusting your monitor
		brightness and		contrast setting on the	image” on page 2-3
		contrast are at		OSD menu.
		the lowest
		setting.
One or more of		This is a		If there are more than	Appendix A, “Service and
the pixels appear		characteristic of		five pixels missing,	Support,” on page A-1
discolored		the LCD		contact the Customer
		technology and		Support Center.
		is not an LCD
		defect.
v	Fuzzy lines in	v	Image setup	Adjust the resolution	“Adjusting your monitor
	text or a		has not been	settings on your system	image” on page 2-3
				to match the native
	blurry image.		optimized		“Manual image setup”
				resolution for this
v	Horizontal or	v	Your system
				monitor: 1280 x 1024 at 60
	vertical lines		Display
				Hz.
	through the		Properties
				Perform automatic image	“Selecting a supported
	image.		setting have
			not been	setup. If automatic image	display mode” on page
			optimized.	setup does not help,	2-5
				perform manual image
				setup.
				When working in the	See the Advanced section
				native resolution, you	of your system’s display
				may find additional	properties.
				improvements by
				adjusting the Dots Per
				Inch (DPI) setting on
				your system.

Manual image setup

If automatic image setup does not establish the image that you prefer, perform manual image setup.

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 to leave the OSD menu.

Chapter 3. Reference information 3-3