HP LD4200, LD4700 manual Appendix a Troubleshooting

Problem	Possible Cause	Solution
Check signal cable message appears.	Signal cable is not connected.	The signal cable between the PC and
		monitor is not connected.
		Check the signal cable.
		Press the INPUT button on the remote
		control to check the input signal.
“Unknown Product” message appears	Monitor driver is not installed.	Install the monitor driver, which is
when the monitor is connected.		provided with the monitor or download
		from the HP Web site
		(http://www.hp.com).
		See if the plug & play function is
		supported by referring to the video
		card’s user manual.
“Key Lock On” message appears when	Key Lock function is turned on.	The control locking function prevents
pressing the Menu button.		unintentional OSD setting change due
		to careless usage. To unlock the
		controls, simultaneously press the
		Menu button and ► button for several
		seconds. (You cannot set this function
		using the remote control buttons. You
		can set this function in the monitor
		only.)
The screen looks abnormal; screen	Screen is out of adjustment.	D-sub analog signal - press the AUTO
position is wrong.		button on the remote control to
		automatically select the optimal screen
		status that fits into the current mode. If
		the adjustment is not satisfactory, use
		the Position OSD menu.
		Check that the video card resolution
		and frequency are supported by the
		monitor. If the frequency is out of range,
		set to the recommended resolution in
		the Control Panel > Display > Setting
		menu of the operating system.
Lines appear on the background	Screen is out of adjustment.	D-sub analog signal - press the AUTO
screen.		button on the remote control to
		automatically select the optimal screen
		status that fits into the current mode. If
		the adjustment is not satisfactory, use
		the Clock OSD menu.

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. If the adjustment is not satisfactory, use the Phase OSD menu.

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 monitor is turned off.

Using a fixed image too long.

If you used a fixed image for a long time, the pixels may be damaged. Use a screen-saver function.

34 Appendix A Troubleshooting ENWW