HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 54)

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
displayed. Power cord is
not connected. Be sure the power cord is properly connected to the outlet.
● 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,
power indicator
is blue, but the
screen appears
extremely dark. Screen needs
adjustment. Adjust brightness and contrast again.
Backlight might need repair.
Power indicator
is amber. Display is in
power saving
mode. Move the mouse or press any key on the keyboard.
Turn off equipment and then back on.
Out of Range
message
appears. Input signal is
out of frequency
range. The signal from the media player/computer (video card) is out of the vertical or
horizontal frequency range of the display. Adjust the frequency range by referring to the
specifications in this manual (maximum resolution: RGB—1920 x 1080 @ 60 Hz;
HDMI—1920 x 1080 @ 60 Hz; DisplayPort—1920 x 1080 @ 60 Hz).
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 signal
cable message
appears. Signal cable is
not connected. The signal cable between the media player/computer and display is not connected.
Make sure that the signal cable is properly connected.
Press the INPUT button on the remote control to check the input signal.
Unknown
Product
message
appears when
the display is
connected. Display driver is
not installed. Install the display driver, which is provided with the display or download from the HP
website
www.hp.com .
See if the Plug and Play function is supported by referring to the video card user manual.
46 Appendix A Troubleshooting ENWW