HP LD4210 42-inch LCD Digital Signage Display - Manual (Page 55)

Problem Possible
cause Solution
Key Lock On
message
appears when
pressing the
Menu button. Key Lock
function is
turned on. The control locking function prevents unintentional OSD setting changes. To unlock the
controls, simultaneously press the Menu button and right arrow ► button for several
seconds. (You cannot set this function using the remote control buttons. You can set this
function with the display only.)
The screen looks
abnormal;
screen position
is wrong. Screen is out of
adjustment. D-sub analog signal - press the AUTO button on the remote control to automatically select
the optimal screen status that fits into the current mode.
Check that the video card resolution and frequency are supported by the display. If the
frequency is out of range, set to the recommended resolution in the Control Panel →
Display → Settings of the operating system.
Lines appear on
the background
screen. Screen is out of
adjustment. D-sub analog signal - press the AUTO button on the remote control to automatically select
the optimal screen status that fits into the current mode.
Horizontal noise
appears or the
characters look
blurred. Screen is out of
adjustment. D-sub analog signal - press the AUTO button on the remote control to automatically select
the optimal screen status that fits into the current mode.
The screen
displays
abnormally. Using an
incorrect input
signal. The proper input signal is not connected to the signal port. Connect the signal cable that
matches with the source input signal.
An after image
appears when
the display is
turned off. Using a fixed
image for too
long a period of
time. If you used a fixed image for a long time, the pixels might be damaged. Use a screen-
saver function or set the OSD menu to the ISM Method.
No sound. Audio cable not
connected. Check that the audio cable is properly connected.
Adjust the volume.
Check if the sound is set properly.
Sound is too
dull. Equalizer is not
balanced. Select the appropriate sound equalize.
Sound is too
low. Sound needs
adjusting. Adjust the volume by pressing the volume buttons on the remote control.
Screen has poor
color resolution
(16 colors). Color is not set
correctly. Set the number of colors to more than 24 bit (true color). Select Control Panel →
Display → Settings → Color quality in the operating system.
Screen color is
unstable or
mono colored. Signal cable or
video card
connection is
loose. Check the connection status of the signal cable, or reinsert the media player/computer
video card.
ENWW Solving common problems 47