A Troubleshooting

Solving common problems

The following table lists possible problems, the possible cause of each problem, and the recommended solutions.

Problem

Possible cause

Solution

 

 

 

No image is

Power cord is

Be sure the power cord is properly connected to the outlet.

displayed.

not connected.

Verify that the outlet has power to it.

 

 

 

 

Check that the fuse or breaker has not tripped or burned out.

 

 

See if the power switch is turned on.

 

 

Might need service.

 

 

 

Power is on,

Screen needs

Adjust brightness, backlight and contrast again.

power indicator

adjustment.

Backlight might need repair.

is green, but the

 

 

 

screen appears

 

 

extremely dark.

 

 

 

 

 

Power indicator

Display is in

Press power button ( ) on the back of the display.

is red.

power saving

 

 

mode.

Activate a signal source.

 

No video signal

Turn off equipment and then back on.

 

is active.

Select an active input or set Auto Detection in the OSD menu to on.

 

 

 

 

 

Out of Range

Input signal is

The signal from the media player/computer (video card) is out of the vertical or

message

out of frequency

horizontal frequency range of the display. Adjust the frequency range.

appears.

range.

NOTE: Vertical Frequency — To enable the user to watch the display, the screen

 

 

 

 

image should change multiple times every second like a fluorescent lamp. The vertical

 

 

frequency or refresh rate is the number of times the image displays per second. The

 

 

unit is measured in Hz.

 

 

Horizontal Frequency — The horizontal interval is the time to display one vertical line.

 

 

When 1 is divided by the horizontal interval, the number of horizontal lines displayed

 

 

every second can be tabulated as the horizontal frequency. The unit is measured in

 

 

kHz.

 

 

 

Check video

Signal cable is

The signal cable between the media player/computer and display is not connected.

cable message

not connected.

Make sure that the signal cable is properly connected.

appears.

 

 

 

 

 

 

OSD Lockout

Key Lock

To unlock the menu, press the up and down arrows on the back of the display

message

function is

simultaneously and hold for 5 seconds.

appears when

turned on.

 

pressing the

 

 

Menu button.

 

 

 

 

 

The screen

Screen is out of

Adjust the position using the OSD menu options H Position and V Position in the

looks abnormal;

adjustment.

Option 1 menu.

screen position

 

Check that the video card resolution and frequency are supported by the display. If the

is wrong.

 

 

frequency is out of range, set to the recommended resolution in the Control Panel

 

 

 

 

Display Settings of the operating system.

 

 

 

52 Appendix A Troubleshooting

ENWW

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HP LD4730 47-inch Micro-Bezel Video Wall Display manual Troubleshooting, Solving common problems

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