HP LD4730 47-inch Micro-Bezel Video Wall Display Using Online Technical Support, Power Button

Problem	Possible cause	Solution
Lines appear on	Screen is out of	Adjust using the procedure described in Optimizing analog images on page 46.
the background	adjustment.
screen.
Horizontal noise	Screen is out of	Adjust using the procedure described in Optimizing analog images on page 46.
appears or the	adjustment.
characters look
blurred.
The screen	Using an	The proper input signal is not connected to the signal port. Connect the signal cable
displays	incorrect input	that matches with the source input signal.
abnormally.	signal.
An after image	Using a fixed	If you used a fixed image for a long time, the pixels might be damaged. Use a screen-
appears when	image for too	saver or one of the functions in the ISM Method option of the OSD menu.
the display is	long a period of
turned off.	time.
No sound.	Audio cable not	Check that the audio cable is properly connected.
	connected.	Adjust the volume.
		Check the Speaker and Audio Source settings in the OSD.
Sound is too	Equalizer is not	Check the audio settings for Balance, Treble, Bass, and Sound Mode.
dull.	balanced.
Sound is too	Sound needs	Adjust the volume.
low.	adjusting.
Screen has	Color is not set	Set the number of colors to more than 24 bit (true color). Select Control Panel →
poor color	correctly.	(Personalization →) Display → Settings → Color quality in the operating system.
resolution (16
colors).
Screen color is	Signal cable or	Check the connection status of the signal cable, or reinsert the media player/computer
unstable or	video card	video card.
mono colored.	connection is
	loose.
Black spots	Black spots are	Refer to Display quality and pixel policy on page 59 for more details.
appear on the	characteristics
screen.	of the LCD
	panel.
The power is	Sleep timer	Check the Schedule submenu of the OSD.
suddenly turned	setting is turned	Check the power control settings.
off.	on, or power is
	interrupted.
Power Button	The sleep	Press the MENU and right arrow buttons on the back of the display and hold for 5
Lockout	button on the	seconds.
message	back of the
appears.	display is
	disabled.

Using Online Technical Support

For online access to technical support information, self-solve tools, online assistance, community forums of IT experts, broad multi-vendor knowledge base, monitoring and diagnostic tools, go to www.hp.com/support

ENWW Using Online Technical Support 53