18
B321/B421
7.2. 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
The 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 [ ] or [ ] button to hear sound.
3. Switch MUTE off by using the
[
] 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.
