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Appendix A Troubleshooting; Solving Common Problems - HP LD4700 - Widescreen LCD Digital Signage Display User Manual

Hp ld4200 and ld4700 lcd monitors user guide.
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Solving Common Problems

The following table lists possible problems, the possible cause of each problem, and the recommended
No image is displayed.
Power is on, power indicator is blue, but
the screen appears extremely dark.
Power indicator is amber.
Out of Range message appears.

Appendix A Troubleshooting

Possible Cause
Power cord not connected.
Screen needs adjustments.
Monitor in power saving mode.
Input signal is out of frequency range.
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.
May need service.
Adjust brightness and contrast again.
Backlight may need repair.
Move the mouse or press any key on the
Turn off equipment and then back on.
The signal from the PC (video card) is out
of the vertical or horizontal frequency
range of the monitor. Adjust the
frequency range by referring to the
specifications in this manual (maximum
resolution: RGB - 1920 x 1080 @ 60Hz;
HDMI - 1920 x 1080 @ 60Hz).
Vertical Frequency - to enable
the user to watch the monitor display,
screen image should be changed tens of
times every second like a fluorescent
lamp. The vertical frequency or refresh
rate is the times of image display 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.


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