NEC PX-50XM4G user manual Troubleshooting, 4-40, Symptom, Checks, Remedy, E-36, Confidential

Troubleshooting

CONFIDENTIAL

If the picture quality is poor or there is some other problem, check the adjustments, operations, etc., before requesting service.

Symptom	Checks	Remedy
Mechanical sound is heard.	• Maybe the sound from the cooling fans used to prevent over heating.
The unit emits a crackling sound.	• Are the image and sound normal?	• If there are no abnormalities in the image and sound,
		the noise is caused by the cabinet reacting to
		changes in temperature. This will not affect
		performance.
Picture is disturbed.	• Is a connected component set directly in front or at	• Leave some space between the display and the
Sound is noisy.	the side of the display?	connected components.
Remote control operates erroneously.
The remote control does not work.	• Are the remote control’s batteries worn out?	• Replace both batteries with new ones.
	• Is IR REMOTE set to ON?	• Set IR REMOTE OFF on OPTION3 menu.
	• Has an ID number been set for the main unit?	• Set an ID number with the ID SELECT button, or set
		the ID number to ALL.
Monitor’s power does not turn on when the	• Is the monitor’s power cord plugged into a power	• Plug the monitor’s power cord into a power outlet.
remote control’s power button is pressed.	outlet?
	• Are all the monitor’s indicators off?	• Press the power button on the monitor to turn on the
		power.
	• Are the remote control’s batteries worn out?	• Replace both batteries with new ones.
	• Is IR REMOTE set to OFF?	• Set IR REMOTE ON.
	• Has an ID number been set for the main unit?	• Set an ID number with the ID SELECT button, or set
		the ID number to ALL.
Monitor does not operate when the remote	• Is the remote control pointed at the monitor, or is	• Point the remote control at the monitor’s remote
control’s buttons are pressed.	there an obstacle between the remote control and	control sensor when pressing buttons, or remove the
	the monitor?	obstacle.
	• Is direct sunlight or strong artificial light shining on	• Eliminate the light by closing curtains, pointing the
	the monitor’s remote control sensor?	light in a different direction, etc.
	• Are the remote control’s batteries worn out?	• Replace both batteries with new ones.
	• The remote cable is plugged into the REMOTE IN	• Unplug the remote cable from the monitor.
	terminal (Wired).
The front panel buttons of the main unit do	• The front panel buttons do not function during	• Set the Control Lock to OFF.
not function.	Control Lock.
No sound or picture is produced.	• Is the monitor’s power cord plugged into a power	• Plug the monitor’s power cord into a power outlet.
	outlet?
Picture appears but no sound is produced.	• Is the volume set at the minimum?	• Increase the volume.
	• Is the mute mode set?	• Press the remote control’s MUTE button.
	• Are the speakers properly connected?	• Connect the speakers properly.
	• Is AUDIO INPUT set correctly?	• Set AUDIO INPUT on the AUDIO menu correctly.
Poor picture with VIDEO signal input.	• Improper control setting.	• Adjust picture control as needed.
	Local interference.	Try another location for the monitor.
	Cable interconnections.	Be sure all connections are secure.
	Input impedance is not correct level.
Poor picture with RGB signal input.	• Improper control setting.	• Adjust picture controls as needed.
	Incorrect 15 PIN connector pin connections.	Check pin assignments and connections.
Tint is poor or colors are weak.	• Are the tint and colors properly adjusted?	• Adjust the tint and color (under PICTURE).
Nothing appears on screen.	• Is the computer’s power turned on?	• Turn on the computer’s power.
	• Is a source connected?	• Connect source to the monitor.
	• Is the power management function in the standby	• Operate the computer (move the mouse, etc.).
	or off mode?
	• Is LOOP OUT set to ON?	• Set LOOP OUT OFF.
Part of picture is cut off or picture is not	• Is the position adjustment appropriate?	• Adjust the IMAGE ADJUST properly.
centered.
Image is too large or too small.	• Is the screen size adjustment appropriate?	• Press the WIDE button on the remote control and
		adjust properly.
Picture is unstable.	• Is the computer’s resolution setting appropriate?	• Set to the proper resolution.
POWER/STANDBY indicator is lighted in red.	• Horizontal and / or vertical sync signal is not	• Check the input signal.
	present when the Intelligent Power Manager
	control is on.
POWER/STANDBY indicator is blinking in	• The temperature inside the main unit has become	• Promptly switch off the power of the main unit and
red.	too high and has activated the protector.	wait until the internal temperature drops. See*1.
POWER/STANDBY indicator is blinking in	——————	• Prompty switch off the power of the main unit. See
green and red, or green.		*2.

*1 Overheat protector

If the monitor becomes too hot, the overheat protector will be activated and the monitor will be turned off. If this happens, turn off the power to the monitor and unplug the power cord. If the room where the monitor is installed is particularly hot, move the monitor to a cooler location and wait for the monitor to cool for 60 minutes. If the problem persists, contact your dealer.

*2 In the following case, power off the monitor immediately and contact your dealer or authorized Service Center.

The monitor turns off 5 seconds after powering on and then the POWER/STANDBY indicator blinks. It indicates that the power supply circuit, plasma display panel, temperature sensor, or one or more fans have been damaged.

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