AOC LM923 User manual

TABLE OF CONTENTS
FOR YOUR SAFETY ------------------------------------------------------------- 1
SAFETY PRECAUTIONS ------------------------------------------------- 2
SPECIAL NOTES ON LCD MONITORS ------------------------------ 3
BEFORE YOU OPERATE THE MONITOR -------------------------------- 3
FEATURES ------------------------------------------------------------------- 3
PACKING LIST -------------------------------------------------------------- 3
INSTALLATION INSTRUCTIONS -------------------------------------- 4-5
ADJUSTING THE VIEWING ANGLE ---------------------------------- 6
OPERATING INSTRUCTIONS ------------------------------------------------- 7
GENERAL INSTRUCTIONS --------------------------------------------- 7
HOW TO ADJUST A SETTING ------------------------------------------ 9
ADJUSTING PICTURE ---------------------------------------------------- 10-11
PLUG AND PLAY ------------------------------------------------------------- 12
TECHNICAL SUPPORT(FAQ) ------------------------------------------------- 13-14
ERROR MESSAGE & POSSIBLE SOLUTION ---------------------- 15
APPENDIX ---------------------------------------------------------------------------- 16
SPECIFICATIONS ---------------------------------------------------------- 16-17
FACTORY PRESET TIMING TABLE ------------------------------------ 18
CONNECTOR PIN ASSIGNMENT -------------------------------------- 19

1
Before operating the monitor, please read this manual thoroughly. This
manual should be retained for future reference.
FCC Class B Radio Frequency Interference Statement
WARNING: (FOR FCC CERTIFIED MODELS)
NOTE: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate
radio frequency energy, and if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
NOTICE
1. The changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate the
equipment.
2. Shielded interface cables and AC power cord, if any, must be used in
order to comply with the emission limits.
3. The manufacturer is not responsible for any radio or TV interference
caused by unauthorized modification to this equipment. It is the
responsibilities of the user to correct such interference.
WARNING:
To prevent fire or shock hazard, do not expose the monitor to rain or moisture.
Dangerously high voltages are present inside the monitor. Do not open the
cabinet. Refer servicing to qualified personnel only.

2
PRECAUTIONS
zDo not use the monitor near water, e.g. near a bathtub, washbowl, kitchen
sink, laundry tub, swimming pool or in a wet basement.
zDo not place the monitor on an unstable cart, stand, or table. If the monitor
falls, it can injure a person and cause serious damage to the appliance.
Use only a cart or stand recommended by the manufacturer or sold with
the monitor. If you mount the monitor on a wall or shelf, use a mounting kit
approved by the manufacturer and follow the kit instructions.
zSlots and openings in the back and bottom of the cabinet are provided for
ventilation. To ensure reliable operation of the monitor and to protect it
from overheating, be sure these openings are not blocked or covered. Do
not place the monitor on a bed, sofa, rug, or similar surface. Do not place
the monitor near or over a radiator or heat register. Do not place the
monitor in a bookcase or cabinet unless proper ventilation is provided.
zThe monitor should be operated only from the type of power source
indicated on the label. If you are not sure of the type of power supplied to
your home, consult your dealer or local power company.
zThe monitor is equipped with a three-pronged grounded plug, a plug with a
third (grounding) pin. This plug will fit only into a grounded power outlet as
a safety feature. If your outlet does not accommodate the three-wire plug,
have an electrician install the correct outlet, or use an adapter to ground
the appliance safely. Do not defeat the safety purpose of the grounded
plug.
zUnplug the unit during a lightening storm or when it will not be used for
long period of time. This will protect the monitor from damage due to
power surges.
zDo not overload power strips and extension cords. Overloading can result
in fire or electric shock.
zNever push any object into the slot on the monitor cabinet. It could short
circuit parts causing a fire or electric shock. Never spill liquids on the
monitor.
zDo not attempt to service the monitor by yourself; opening or removing
covers can expose you to dangerous voltages and other hazards. Please
refer all servicing to qualified service personnel.
zTo ensure satisfactory operation, use the monitor only with UL listed
computers which have appropriate configured receptacles marked
between 100 - 240V AC, Min. 5A.
zThe wall socket shall be installed near the equipment and shall be easily
accessible.

3
SPECIAL NOTES ON LCD MONITORS
The following symptoms are normal with LCD monitor and do not indicate a
problem.
NOTES
•Due to the nature of the fluorescent light, the screen may flicker during
initial use. Turn off the Power Switch and then turn it on again to make
sure the flicker disappears.
•You may find slightly uneven brightness on the screen depending on the
desktop pattern you use.
•The LCD screen has effective pixels of 99.99% or more. It may include
blemishes of 0.01% or less such as a missing pixel or a pixel lit all of the
time.
•Due to the nature of the LCD screen, an afterimage of the previous screen
may remain after switching the image, when the same image is displayed
for hours. In this case, the screen is recovered slowly by changing the
image or turning off the Power Switch for hours.
BEFORE YOU OPERATE THE MONITOR
FEATURES
EAURES
•48cm(19”) TFT Color LCD Monitor
•Crisp, Clear Display for Windows
•Recommened Resolutions: 1280 X 1024 @60Hz
•EPA ENERGY STAR®
•Space Saving, Compact Case Design
CHECKING THE CONTENTS OF THE PACKAGE
The product package should include the following items:
1. LCD Monitor
2. Owner’s Manual
3. 15-pin D-Sub Cable
4. Audio Cable
5. Power Cord

4
INSTALLATION INSTRUCTIONS
SWIVEL BASE
Install Remove
Figure 1 Installing and Removing the Swivel Base
POWERCORD
Power Source:
1. Make sure that the power cord is the correct type required in your area.
2. This LCD monitor has an External universal power supply that allows
operation in either 100/120V AC or 220/240V AC voltage area (No user
adjustment is required.)
3. Connect the power cord into your LCD monitor’s power input socket, and
then plug the other end into a 3-pin AC power outlet. The power cord may
be connected to either a wall power outlet or the power outlet socket on
your PC, depending on the type of power cord supplied with your LCD
monitor.

5
INSTALLATIONS INSTRUCTIONS (cont)
CABLE CONNECTIONS
Turn off your computer before performing the procedure below.
1. Plug the AC-power cord one end to LCD monitor’s AC input socket , the
other end to Wall outlet.
2. Connect one end of the 15-pin D-Sub cable to the back of the monitor and
connect the other end to the computer’s D-Sub port.
3. (Optional) - Connect the audio cable between the monitor's audio input and
the PC's audio output (green port).
4. (Optional – Headphone not included) – Connect a headphone to the
monitor’s headphone jack.
5. Turn on your monitor and computer.
Caution: If the AC outlet is not grounded (with three holes), install the proper
grounding adapter (not supplied).
Figure 2 Connecting Cables
1. Power Cable
2. 15-pin D-Sub Cable
3. Audio Cord
4. Headphone output

6
ADJUSTING THE VIEWING ANGLE
INSTALLATION INSTRUCTIONS
•For optimal viewing it is recommended to look at the full face of the
monitor, then adjust the monitor’s angle to your own preference.
•Hold the stand so you do not topple the monitor when you change the
monitor’s angle.
•You are able to adjust the monitor’s angle from -5°to 20°.
Figure 3
NOTES
•Do not touch the LCD screen when you change the angle. It may cause
damage or break the LCD screen.
•Careful attention is required not to catch your fingers or hands when you
change the angle.

7
OPERATING INSTRUCTIONS
GENERAL INSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons
are located on the side of the monitor (See Figure 4). By changing these
settings, the picture can be adjusted to your personal preferences.
•The power cord should be connected.
•Connect the video cable from the monitor to the video card.
•Press the power button to turn on the monitor. The power indicator will
light up.
Figure 4 External Control Button
EXTERNAL CONTROLS
1. Auto Adjust button / Exit
2. /Volume down
3. /Volume up
4. MENU / ENTER
5. Power Button
6. LED

8
FRONT PANEL CONTROL
•Power Button:
Press this button to turn the monitor ON or OFF.
•Power Indicator:
Green — Power On mode.
Orange — Off mode.
•MENU / ENTER :
Active OSD menu or function adjust confirm or Exit OSD menu when in
volume OSD status.
•Volume / :
Increase volume or adjust function.
•Volume / :
Decrease volume or adjust function.
•Auto Adjust button / Exit:
1. When OSD menu is in active status, this button will act as EXIT-KEY
(EXIT OSD menu).
2. When OSD menu is in off status, press this button to activate the Auto
Adjustment function.
The Auto Adjustment function is used to optimized the HPos, VPos,
Clock and Focus.
OSD Lock Function: To lock the OSD, press and hold the MENU button
while the monitor is off and then press power button to turn the monitor on. To
un-lock the OSD - press and hold the MENU button while the monitor is off
and then press power button to turn the monitor on.
NOTES
•Do not install the monitor in a location near heat sources such as radiators
or air ducts, or in a place subject to direct sunlight, or excessive dust or
mechanical vibration or shock.
•Save the original shipping carton and packing materials, as they will come
in handy if you ever have to ship your monitor.
•For maximum protection, repackage your monitor as it was originally
packed at the factory.
•To keep the monitor looking new, periodically clean it with a soft cloth.
Stubborn stains may be removed with a cloth lightly dampened with a mild
detergent solution. Never use strong solvents such as thinner, benzene, or
abrasive cleaners, since these will damage the cabinet. As a safety
precaution, always unplug the monitor before cleaning it.

9
HOW TO ADJUST A SETTING
1. Press the MENU-button to activate the OSD window (Figure 5).
2. Press or to navigate through the functions. Once the desired function
is highlighted, press the MENU-button to activate it. If the function
selected has a sub-menu, press or again to navigate through the
sub-menu functions. Once the desired function is highlighted, press
MENU-button to activate it.
3. Press or to change the settings of the selected function.
4. To exit and save, select the exit function. If you want to adjust any other
function, repeat steps 2-3.
Figure 5 The OSD Message

10
ADJUSTING THE PICTURE
The descriptions for function control LEDS
Main Menu
Item
Main
Menu
Icon
Sub Menu
Item
Sub
Menu
Icon Description
Contrast Contrast from Digital-register.Luminance
Brightness Backlight Adjustment
Focus Adjust Picture Phase to reduce
Horizontal-Line noise
Image
Setup Clock Adjust picture Clock to reduce
Vertical-Line noise.
H. Position Adjust the horizontal position of the
picture.
Image
Position V. Position Adjust the verticalposition of the
picture.
Warm N/A Recall Warm Color Temperature
from EEPROM.
Cool N/A Recall Cool Color Temperature from
EEPROM.
User / Red Red Gain from Digital-register.
User /
Green Green Gain Digital-register.
Color
Temp.
User / Blue Blue Gain from Digital-register.

11
Main Menu
Item
Main
Menu
Icon
Sub Menu
Item
Sub
Menu
Icon Description
Yes
N/A Auto Adjust the H/V Position, Focus and Clock of picture.
Auto Config
No N/A Do not execute Auto Config, return
to main menu.
H. Position Adjust the horizontal position of the
OSD.
V. Position Adjust the verticalposition of the
OSD.
OSD Setup
OSD
Timeout Adjust the OSD timeout.
Language
Language N/A Set OSD language.
Information
Information N/A Show the resolution, H/V frequency
and input port of current input timing.
Yes N/A Clear each old status of Auto-
configuration and set the color
temperature to Cool.
Reset
No N/A Do not execute reset, return to main
menu.
Exit
N/A N/A Exit OSD

12
PLUG AND PLAY
Plug & Play DDC 2B Feature
This monitor is equipped with VESA DDC 2B capabilities according to the
VESA DDC STANDARD. It allows the monitor to inform the host system of its
identity and, depending on the level of DDC used, communicate additional
information about its display capabilities.
The DDC 2B is a bidirectional data channel based on the I²C protocol. The
host can request EDID information over the DDC2B channel.
THIS MONITOR WILL APPEAR TO BE NON-FUNCTIONAL IF THERE IS
NO VIDEO INPUT SIGNAL. IN ORDER FOR THIS MONITOR TO OPERATE
PROPERLY, THERE MUST BE A VIDEO INPUT SIGNAL.
This monitor meets the Green monitor standards as set by the Video
Electronics Standards Association (VESA) and/or the United States
Environmental Protection Agency (EPA) and The Swedish Confederation
Employees (NUTEK). This feature is designed to conserve electrical energy
by reducing power consumption when there is no video-input signal present.
When there is no video input signal this monitor, following a time-out period,
will automatically switch to an OFF mode. This reduces the monitor's internal
power supply consumption. After the video input signal is restored, full power
is restored and the display is automatically redrawn. The appearance is similar
to a "Screen Saver" feature except the display is completely off. The display is
restored by pressing a key on the keyboard, or clicking the mouse.

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
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
Picture is fuzzy *Adjust the Contrast and Brightness
Controls.
Picture bounces or a 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.
*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.
Missing one of the primary
colors (RED, GREEN, or
BLUE)
*Inspect the monitor’s video cable and
make sure that none of the pins are
bent.

14
Screen image is not centered or sized
properly. *Adjust H-Position and V-Position or press hot-key (AUTO).
Picture has color defects
(white does not look white) *Adjust RGB color or select a pre-set color temperature from OSD.
Horizontal or vertical 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.
FOCUS adjusts the phase of the pixel clock signal. With a wrong phase
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 .

15
ERROR MESSAGE & POSSIBLE SOLUTION
NO SIGNAL
1. Check that the signal-cable is properly connected , If the connector is
loose, tighten the connector’s screws.
2. Check the signal-cable’s connection pins for damage.
INPUT NOT SUPPORT
Your computer has been set to unsuitable display mode ,set the computer to
display mode given in the following table (see page 18) .

16
APPENDIX
SPECIFICATIONS
Driving system TFT Color LCD
LCD Panel Size 48cm(19")
Pixel pitch 0.294mm( H )x 0.294mm( V )
Viewable angle 170°(H) 170°(V)
Video R,G,B Analog Interface
Input Separate Sync. H/V TTL
H-Frequency 30KHz – 83KHz (Analog)
V-Frequency 55-75Hz (Analog)
Display Colors 16.2M Colors
Dot Clock 135MHz (Analog)
Max. Resolution 1280 x 1024 @75Hz(Analog)
Plug & Play VESA DDC 2BTM
EPA ENERGY STAR®ON Mode <55W
OFF Mode <2W
Audio output Rated Power 3.0W rms (Per channel)
Input Connector D-Sub 15pin
Input Video Signal Analog:0.7Vp-p(standard),
75 OHM, Positive
Maximum Screen Size Horizontal : 376.32mm
Vertical : 301.056mm
Environmental
Considerations Operating Temp: 5° to 50°C Storage Temp.: -20° to 60°C
Operating Humidity :
10% to 85%
Weight (N. W.): 5.9Kgs Unit (net)
Dimensions 425 (W) x 418 (H) x 207 (D)mm

17
Switch
•Auto Config / Exit
•/Volume
•/ Volume
•Power Button
•MENU / ENTER
External Controls: Functions •Contrast
•Brightness
•Focus
•Clock
•Auto Config
•H. Position
•V. Position
•OSD Setup
•Language
•(Warm)Color
•(Cool)Color
•RGB Color temperature
•Information
•Reset
•Exit
Power Consumption ( Maximum ) 55 Watts
Regulatory Compliance cULus, FCC, TCO’99

18
FACTORY PRESET TIMING TABLE
STANDARD
RESOLUTION HORIZONTAL
FREQUENCY VERTICAL FREQUENCY
Dos-mode 720 x 400 31.47kHz 70.0Hz
640 × 480 31.47kHz 60.0Hz
VGA 640 × 480 37.50kHz 75.0Hz
800 × 600 37.879kHz 60.0Hz
SVGA 800 × 600 46.875kHz 75.0Hz
1024 × 768 48.363kHz 60.0Hz
1024 × 768 56.476kHz 70.0Hz
XGA
1024 × 768 60.021kHz 75.0Hz
1280 × 1024 64.000kHz 60.0Hz
SXGA 1280 × 1024 80.000kHz 75.0Hz
Note: The factory preset mode for DOS is 720x400 @70Hz.

19
CONNECTOR PIN ASSIGNMENT
15
610
11 15
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION PI N NO. DESCRIPTION
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. NC
4. Ground 12. DDC-Serial Data
5. Ground 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground