ViewSonic CDM4300T CDM4300T User Guide English - Page 44

Troubleshooting

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8.2. Troubleshooting Symptom Possible Cause Remedy No picture is displayed 1. The power cord is disconnected. 1. Plug in the power cord. 2. The main power switch on the back of the display is not switched on. 3. The selected input has no connection. 2. Make sure the power switch is switched on. 3. Connect a signal connection to the display. 4. The display is in standby mode. Interference displayed on the Caused by surrounding electrical display or audible noise is appliances or fluorescent lights. heard Move the display to another location to see is the interference is reduced. Color is abnormal The signal cable is not connected properly. Make sure that the signal cable is attached firmly to the back of the display. Picture is distorted with abnormal patterns 1. The signal cable is not connected 1. Make sure that the signal cable properly. is attached firmly. 2. The input signal is beyond the 2. Check the video signal source capabilities of the display. to see if it is beyond the range of the display. Please verify its specifications with this display's specification section. Display image doesn't fill up Zoom mode is not correctly set. the full size of the screen Use the Zoom mode or Custom zoom function in the Screen menu to fine tune display geometry and time frequency parameter. Can hear sound, but no picture Improperly connected source signal Make sure that both video inputs cable. and sound inputs are correctly connected. Can see picture but no sound 1. Improperly connected source is heard signal cable. 2. Volume is turned all the way down. 3. [MUTE] is turned on. 4. No external speaker connected. 1. Make sure that both video inputs and sound inputs are correctly connected. 2. Press [VOL DOWN] or [VOL UP] button to hear sound. 3. Switch MUTE off by using the [MUTE] button. 4. Connect external speakers and adjust the volume to a suitable level. Some picture elements do not Some pixels of the display may not light up turn on. This display is manufactured using an extremely high level of precision technology: however, sometimes some pixels of the display may not display. This is not a malfunction. After-Images can still be A still picture is displayed for an seen on the display after over extended period of time the display is powered off. (Examples of still pictures include logos, video games, computer images, and images displayed in 4:3 normal mode) Do not allow a still image to be displayed for an extended period of time as this can cause a permanent after-image to remain on the display. 36

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36
8.2.
Troubleshooting
Symptom
Possible Cause
Remedy
No picture is displayed
1. The power cord is disconnected.
2. The main power switch on
the back of the display is not
switched on.
3. The selected input has no
connection.
4. The display is in standby mode.
1. Plug in the power cord.
2. Make sure the power switch is
switched on.
3. Connect a signal connection to
the display.
Interference displayed on the
display or audible noise is
heard
Caused by surrounding electrical
appliances or fluorescent lights.
Move the display to another location
to see is the interference is reduced.
Color is abnormal
The signal cable is not connected
properly.
Make sure that the signal cable is
attached firmly to the back of the
display.
Picture is distorted with
abnormal patterns
1. The signal cable is not connected
properly.
2. The input signal is beyond the
capabilities of the display.
1. Make sure that the signal cable
is attached firmly.
2. Check the video signal source
to see if it is beyond the range
of the display. Please verify its
specifications with this display’s
specification section.
Display image doesn’t fill up
the full size of the screen
Zoom mode is not correctly set.
Use the Zoom mode or Custom
zoom function in the Screen menu
to fine tune display geometry and
time frequency parameter.
Can hear sound, but no
picture
Improperly connected source signal
cable.
Make sure that both video inputs
and sound inputs are correctly
connected.
Can see picture but no sound
is heard
1. Improperly connected source
signal cable.
2. Volume is turned all the way
down.
3. [
MUTE
] is turned on.
4. No external speaker connected.
1. Make sure that both video inputs
and sound inputs are correctly
connected.
2. Press [
VOL DOWN
] or [
VOL UP
]
button to hear sound.
3. Switch MUTE off by using the
[
MUTE
] button.
4. Connect external speakers and
adjust the volume to a suitable
level.
Some picture elements do not
light up
Some pixels of the display may not
turn on.
This display is manufactured using
an extremely high level of precision
technology: however, sometimes
some pixels of the display may not
display. This is not a malfunction.
After-Images can still be
seen on the display after
the display is powered off.
(Examples of still pictures
include logos, video games,
computer images, and images
displayed in 4:3 normal mode)
A still picture is displayed for an
over extended period of time
Do not allow a still image to be
displayed for an extended period of
time as this can cause a permanent
after-image to remain on the
display.