AOC LM722 User Manual
英文
13
TECHNICAL SUPPORT (FAQ)
Problem & Question
Possible Solution
Power LED is not on
*Check if the Power Switch is in the ON position
*Power Cord should be connected
*Power Cord should be connected
No
Plug
&
Play
*Check if the PC system is Plug & Play
compatible
*Check if the Video Card is Plug & Play
compatible
*Check if the D-15 plug pin of Video Cable is
bent
*Make sure the LCD Monitor Drivers are
installed
Picture is fuzzy
*Adjust the Contrast and Brightness Controls.
Picture bounces or a
wave pattern is present in
the picture
wave pattern is present in
the picture
*Move electrical devices that may cause
electrical interference.
The power LED is ON
(orange) but there’s no
video or no picture.
(orange) but there’s no
video or no picture.
*Computer Power Switch should be in the ON
position.
*Computer Video Card should be snugly seated
in its slot.
*Make sure monitor’s video cable is properly
connected to the computer.
*Inspect monitor’s video cable and make sure
none of the pins are bent.
*Make sure computer is operational by hitting
the CAPS LOCK key on the keyboard while
observing the CAPS LOCK LED. The LED
should either turn ON or OFF after hitting the
CAPS LOCK key.
observing the CAPS LOCK LED. The LED
should either turn ON or OFF after hitting the
CAPS LOCK key.
Missing one of the
primary colors (RED,
GREEN, or BLUE)
primary colors (RED,
GREEN, or BLUE)
*Inspect the monitor’s video cable and make
sure that none of the pins are bent.
Screen image is not
centered or sized properly.
centered or sized properly.
*Adjust pixel frequency (CLOCK) and FOCUS or
press hot-key (AUTO)
Picture has color defects
(white does not look white)
(white does not look white)
*Adjust RGB color or select color temperature
Poor brightness or contrast *When the brightness of the screen lowers after
being used for a certain period and the function
of the display is affected, send it to our
authorized service center for repair.
of the display is affected, send it to our
authorized service center for repair.
Horizontal or vertical
disturbances on the screen
disturbances on the screen
*Use win 95/98 shut-down mode Adjust CLOCK
and FOCUS or perform hot- key (AUTO-key).
CLOCK (pixel frequency) controls the number of pixels scanned by one
horizontal sweep. If the frequency is not correct, the screen shows vertical
stripes and the picture has not correct width.
horizontal sweep. If the frequency is not correct, the screen shows vertical
stripes and the picture has not correct width.
FOCUS adjusts the phase of the pixel clock signal. With a wrong phase
adjustment the picture has horizontal disturbances in light picture.
adjustment the picture has horizontal disturbances in light picture.
For FOCUS and CLOCK adjustment use “dot-pattern” or win 95/98 shut-down
mode pattern.
mode pattern.