VIEWSONIC VPW4255 - Manual (Page 30)

TROUBLESHOOTING (continued)
Symptom Point to check See page
• The temperature of the display panel surface is high. • The plasma display panel is lighting the phosphors by the
temperature of the panel surface to increase. Please note that this
is not a malfunction.
-
• 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.
• High-precision technology is used to manufacture the plasma
some parts of the screen. Please note that this is not a
malfunction. -
• Vertical stripes appear, depending on the screen contents. • The plasma display panel is lighting the phosphors by the
malfunction.
-
• Coarse horizontal stripes appear in FULL display. • Adjusting the Clock Phase will reduce the horizontal stripes.
(RGB input)
• Flickering in the form of horizontal lines oscillating up and
down.
(PC INPUT MODE only)
• 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.
• Try turning the Vertical Filter On. For this case however, the
vertical resolution will drop.
-
• The top of the monitor heats up. • When used for long periods of time, the top of the monitor may
heat up. This is not a malfunction.
-
• Text characters are displayed with varying thicknesses. • The thicknesses of characters and lines may vary if images with a
-
ViewSonic VPW4255 28
Symptoms That Appear to be Failures (continued)
discharge of internal energy. In some cases, this may cause the
display panel. However in some cases, there are minor defects in
discharge of internal energy. Depending on the screen
contents, in rare cases, this may cause vertical stripes to appear
• The fan lowers the temperature of this unit. If the ambient air
vertical resolution greater than 512 lines are displayed.
This is not a malfunction.
because the phospors fail to light. Please note that this is not a
• The fan motor is noisy. (Only for models with fan.)
temperature increases, the fan RPMs increase and motor
noise increases. This is not a malfunction.