Hitachi CMP4221 User Manual page 33

TROUBLESHOOTING (continued)
Symptoms That Seemingly Appear to be Failures(continued)
Symptom
The temperature of the display panel surface is high.
There are locations on the screen that are different from the
periphery(*)
* Points that do not light, points with brightness different
from that of the periphery, points with color different from
that of the periphery, etc.
Vertical stripes appear, depending on the screen contents.
Coarse horizontal stripes appear in16:9 display.
Flickering in the form of horizontal lines oscillating up and
down.
(RGB INPUT only)
The top of the monitor heats up.
Text characters are displayed with varying thicknesses.
The brightness contrast in the display seems not bright
enough.
The screen becomes dark and the images cannot be seen
during VTR special playback (fast forward, rewind).
Point to check
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.
High-precision technology is used to manufacture the plasma display panel,
however in some cases; there are minor defects in some parts of the screen.
Please note that this is not a malfunction.
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.
Adjusting the Clock Phase will reduce the horizontal stripes.
(RGB input)
If the direct frequency from the computer is below 85Hz, try a higher
frequency (upper limit 85Hz). There may be a slight attenuation of the current
image.
When used for long periods of time, the top surface of the monitor may heat
up. This is not a malfunction.
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.
The ambient temperature of the monitor may be low. When used in the
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.
This sometimes occurs when a component output VTR such as the 480i is
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.
See Page
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