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Service Manual
TABLE OF CONTENTS
FOR YOUR SAFETY -------------------------------------------------------------
SAFETY PRECAUTIONS -------------------------------------------------
SPECIAL NOTES ON LCD MONITORS ------------------------------
BEFORE YOU OPERATE THE MONITOR --------------------------------
FEATURES -------------------------------------------------------------------
PACKING LIST --------------------------------------------------------------
INSTALLATION INSTRUCTIONS --------------------------------------
ADJUSTING THE VIEWING ANGLE ----------------------------------
OPERATING INSTRUCTIONS ------------------------------------------------- 7
GENERAL INSTRUCTIONS ---------------------------------------------
HOW TO ADJUST A SETTING ------------------------------------------ 9
ADJUSTING PICTURE ----------------------------------------------------
PLUG AND PLAY ------------------------------------------------------------- 12
TECHNICAL SUPPORT(FAQ) ------------------------------------------------- 13-14
ERROR MESSAGE & POSSIBLE SOLUTION ---------------------- 15
APPENDIX ---------------------------------------------------------------------------- 16
SPECIFICATIONS ----------------------------------------------------------
FACTORY PRESET TIMING TABLE ------------------------------------ 18
CONNECTOR PIN ASSIGNMENT -------------------------------------- 19
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Table of Contents
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Summary of Contents for AOC LM923
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Page 1: Table Of Contents
TABLE OF CONTENTS FOR YOUR SAFETY ------------------------------------------------------------- SAFETY PRECAUTIONS ------------------------------------------------- SPECIAL NOTES ON LCD MONITORS ------------------------------ BEFORE YOU OPERATE THE MONITOR -------------------------------- FEATURES ------------------------------------------------------------------- PACKING LIST -------------------------------------------------------------- INSTALLATION INSTRUCTIONS -------------------------------------- ADJUSTING THE VIEWING ANGLE ---------------------------------- OPERATING INSTRUCTIONS ------------------------------------------------- 7 GENERAL INSTRUCTIONS --------------------------------------------- HOW TO ADJUST A SETTING ------------------------------------------ 9 ADJUSTING PICTURE ---------------------------------------------------- 10-11... -
Page 2: For Your Safety
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. -
Page 3: Safety Precautions
PRECAUTIONS Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet basement. Do 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. -
Page 4: Special Notes On Lcd Monitors
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. -
Page 5: Installation Instructions
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. - Page 6 INSTALLATIONS INSTRUCTIONS (cont) CONNECTIONS CABLE 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.
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Page 7: Adjusting The Viewing Angle
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. -
Page 8: Operating Instructions
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. •... -
Page 9: Power Indicator
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. -
Page 10: How To Adjust A Setting
HOW TO ADJUST A SETTING 1. Press the MENU-button to activate the OSD window (Figure 5). 2. Press 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 again to navigate through the sub-menu functions. -
Page 11: Adjusting Picture
ADJUSTING THE PICTURE The descriptions for function control LEDS Main Main Menu Sub Menu Menu Menu Description Item Item Icon Icon Luminance Contrast Contrast from Digital-register. Brightness Backlight Adjustment Image Focus Adjust Picture Phase to reduce Setup Horizontal-Line noise Clock Adjust picture Clock to reduce Vertical-Line noise. - Page 12 Main Main Menu Sub Menu Menu Menu Description Item Item Icon Icon Auto Config Auto Adjust the H/V Position, Focus and Clock of picture. Do not execute Auto Config, return to main menu. OSD Setup H. Position Adjust the horizontal position of the OSD.
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Page 13: Plug And Play
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. -
Page 14: Technical Support (Faq)
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 &... - Page 15 Screen image is not centered or sized *Adjust H-Position and V-Position or properly. press hot-key (AUTO). Picture has color defects *Adjust RGB color or select a pre-set (white does not look white) color temperature from OSD. Horizontal or vertical disturbances on *Use win 95/98 shut-down mode the screen Adjust...
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Page 16: Error Message & Possible Solution
ERROR MESSAGE & POSSIBLE SOLUTION NO SIGNAL Check that the signal-cable is properly connected , If the connector is loose, tighten the connector’s screws. 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) . -
Page 17: Appendix
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... - Page 18 • 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 •...
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Page 19: Factory Preset Timing Table
FACTORY PRESET TIMING TABLE HORIZONTAL VERTICAL STANDARD RESOLUTION FREQUENCY FREQUENCY Dos-mode 720 x 400 31.47kHz 70.0Hz 640 × 480 31.47kHz 60.0Hz 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 ×... -
Page 20: Connector Pin Assignment
CONNECTOR PIN ASSIGNMENT 15 - Pin Color Display Signal Cable PIN NO. DESCRIPTION PI N NO. DESCRIPTION Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground...