ViewSonic VPW4200 User Manual page 33

TROUBLESHOOTING (continued)
Symptoms (continued)
Symptom
The temperature of the display panel surface is warm.
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 in FULL display.
The screen flickers in the form of horizontal lines oscillating up
and down.
(PC INPUT MODE only)
The top surface of the monitor heats up.
Text characters are displayed with varying thickness.
The display does not seem bright enough.
The display does not seem bright enough. (RGB input)
Point to check
The plasma display panel works by lighting phosphors. 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 over the life of the plasma panel, a few pixel
elements may fail. This is not to be considered a defect in the panel.
The plasma display panel works by 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 its failure to light the relevant pixels. Please note that
this is not a malfunction.
Adjusting the Clock Phase will reduce the horizontal stripes.
(RGB input)
If the frequency from the computer is below 85Hz, try a higher
frequency (to a maximum limit of 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 thickness of characters and lines may vary when 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. Ambient
temperatures less than about 15° degrees, may cause lower
luminance.
The panel protection circuit automatically lowers the luminance, and
is not a malfunction. The luminance will be restored when power is
turned on for a while.
The setup-frequency setting in RGB input may be set to PC mode.
When set to PC mode, the luminance is lowered by about 10% than
when set as Movie mode. This is not a malfunction. If you do not
mind flicker on the display, please switch to Movie mode.
ViewSonic VPW4200/4210
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