Hitachi CMP4221 Periphery, Please note that this is not a malfunction, That of the periphery, etc

TROUBLESHOOTING (continued)

Symptoms That Seemingly Appear to be Failures(continued)

Symptom	Point to check	See Page
y The temperature of the display panel surface is high.	y The plasma display panel is lighting the phosphors by the discharge of	-
	internal radiation. In some cases, this may cause the temperature of the
	panel surface to increase. Please note that this is not a malfunction.
y There are locations on the screen that are different from the	y High-precision technology is used to manufacture the plasma display panel,
periphery(*)	however in some cases; there are minor defects in some parts of the screen.
* Points that do not light, points with brightness different	Please note that this is not a malfunction.	-
from that of the periphery, points with color different from
that of the periphery, etc.
y Vertical stripes appear, depending on the screen contents.	y The plasma display panel is lighting the phosphors on it by the discharge of
	internal radiation. Depending on the screen contents, in rare cases this may	-
	cause vertical stripes to appear because of failure to light. Please note that
	this is not a malfunction.
y Coarse horizontal stripes appear in16:9 display.	y Adjusting the Clock Phase will reduce the horizontal stripes.	22
	(RGB input)
y Flickering in the form of horizontal lines oscillating up and	y If the direct frequency from the computer is below 85Hz, try a higher
down.	frequency (upper limit 85Hz). There may be a slight attenuation of the current	-
(RGB INPUT only)	image.
y The top of the monitor heats up.	y When used for long periods of time, the top surface of the monitor may heat	-
	up. This is not a malfunction.
y Text characters are displayed with varying thicknesses.	y The thicknesses of characters and lines may vary if images with a vertical	-
	resolution greater than 480 lines are displayed; however this is not a
	malfunction.
y The brightness contrast in the display seems not bright	y The ambient temperature of the monitor may be low. When used in the
enough.	ambient temperatures less than about 15 degrees, it may cause lower
	luminance. It happens in an operation of the panel protect circuit, and this is	-
	not a malfunction. The luminance will recover by turning on electricity for a
	while.
y The screen becomes dark and the images cannot be seen	y This sometimes occurs when a component output VTR such as the 480i is
during VTR special playback (fast forward, rewind).	connected.
	This is not a malfunction; therefore, please take note that this may occur.
	When it does occur, change to composite output, or S.video output.

33

ENGLISH