Optima L903A User manual

19" Wide LCD Color Monitor OptimaL903A
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Service
Service
Service
Horizontal Frequency
30 kHz-80 kHz
TABLEOFCONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
Important Safety Notice.………….…..................……......3
1. Monitor Specification.................................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…………...................…...........6
3.1 General Instructions.....................................…...........6
3.2 Control Button……………………………..……...........6
3.3 Adjusting the Picture...........................…............8
4. Input/Output Specification............……………............10
4.1 Input Signal Connector............…..……................10
4.2 Factory Preset Display Modes.........................11
4.3 Panel Specification.....………………........................12
5.Block Diagram…….…................……………...............15
5.1 Software Flow Chart…………………………….........15
5.2 Electrical Block Diagram…………………...…......17
6. Schematic……………..............................….....19
6.1 Main Board…………..............................................19
6.2 Power Board....……………....................................24
6.3 Key Board ……………………………..…………….26
6.4 Audio Board....……................................................27
7. PCB Layout..………….......................................28
7.1 Main Board……………......................................28
7.2 Power Board…......................................................31
7.3 Audio Board....…….......................................33
7.4 Keypad Board……….....................................33
8. Maintainability……….......................................34
8.1. Equipments and Tools Requirement.....................34
8.2. Trouble Shooting…………....................................35
9. White-Balance, Luminance adjustment...................41
10.Monitor Exploded View……..……………............42
11.BOM List....…….....................................................43
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Revision Date Revision History TPV Model
A00 Dec-25-2006 Initial release T96HNNHLWCOPAP

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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The special
tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods
may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE NOT
EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in which
service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not undertaken
any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by
AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be
jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock, fire,
or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC. AOC
assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the
panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)

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1. Monitor Specifications
Driving system TFT Color LCD
Size 48cm(19.0")
LCD Panel
Pixel pitch 0.2835mm( H ) × 0.2835mm( V )
Video R,G,B Analog Interface
Separate Sync. H/V TTL
H-Frequency 30kHz – 80kHz
Input
V-Frequency 55-75Hz
Display Colors 16.2M Colors
Dot Clock 135MHz
Max. Resolution 1440 × 900 @60Hz
Plug & Play VESA DDC2BTM
ON Mode ≤36W
EPA ENERGY STAR®
OFF Mode ≤1W
Input Connector 15-pin D-Sub
Input Video Signal Analog:0.7Vp-p(standard),
75 OHM, Positive
Maximum Screen Size Horizontal : 408.24mm
Vertical : 255.15mm
Power Source 100~240VAC,50~60Hz
Environmental
Considerations
Operating Temp: 5° to 50°C
Storage Temp.: -20° to 60°C
Operating Humidity: 10% to 85%
Dimension 438.5 (W)×356.9 (H)×210.8 (D)mm
Weight (N. W.) 4.8kg Unit (net)

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2. LCD Monitor Description
The LCD MONITOR will contain a main board, a power board, an audio board and a key board which house the flat
panel control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
Monitor Block Diagram
AC-IN
100V-240V
Power board
(Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main board RS232 Connector
For white balance
adjustment in factory
mode
HOST Com
p
uter
CCFL Drive.
Video signal, DDC
Audio board Key board

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3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The control buttons are located in the front of the monitor.
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.
3.2 Control Buttons
EXTERNAL CONTROLS
1. Auto Adjust Key/Exit 4. > / Volume
2. < / Volume 5. MENU/ENTER
3. Power Key/ LED

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FRONT PANEL CONTROL
•Power Button / Power Indicator:
Press this button to turn the monitor ON or OFF.
Green — Power On mode.
Orange — Off mode.
•MENU / ENTER:
Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when OSD is ON or Exit OSD
menu when in Volume Adjust OSD status.
•>/Volume:
Activates the volume control when the OSD is OFF or navigate through adjustment icons when OSD is ON or
adjust a function when function is activated.
•< /Volume:
Activates the volume control when the OSD is OFF or navigate through adjustment icons when OSD is ON or
adjust a function when function is activated.
•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 for 2 seconds to activate the Auto Adjustment function.
The Auto Adjustment function is used to set 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 maintain the cleanness of your LCD display, wipe it periodically with clean and soft cloth. The screen may be
damaged by any liquid splash.
•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.

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3.3 Adjusting the Picture
Adjustment steps:
1. Press the MENU-button to activate the OSD window.
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.
The OSD Message
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 vertical position of the picture.
Warm N/A Recall Warm Color Temperature from EEPROM.
Cool N/A Recall Cool Color Temperature from EEPROM.
sRGB N/A Recall sRGB 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.

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Main
Menu
Item
Main Menu
Icon
Sub
Menu
Item
Sub Menu Icon Description
Analog N/A
Select input signal from analog source
(D-Sub).
Input Select
Digital N/A Select input signal from digital source (DVI).
H. Position
Adjust the horizontal position of the OSD.
V. Position
Adjust the vertical position 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.
Reset
No N/A Do not execute reset, return to main menu.
Exit
N/A N/A Exit OSD

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4. Input/Output Specification
4.1 Input Signal Connector
Pin No.
Description Pin No. Description
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. Ground
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
15 - Pin Color Display Signal Cable
15
610
11 15
Pin No. Description Pin No. Description
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. Ground(for+5V)
4. TMDS Data 4- 16. Hot Plug Detect
5. TMDS Data 4+ 17. TMDS Data 0-
6. DDC Clock 18. TMDS Data 0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. N.C. 20. TMDS Data 5-
9. TMDS Data 1- 21. TMDS Data 5+
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock +
12. TMDS Data 3- 24. TMDS Clock -
24 - Pin Color Display Signal Cable

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Factory Preset Display Modes
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
WXGA+ 1440×900 55.935 kHz 60.0 Hz

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4.3 Panel Specification
HannStar Display model HSD190MGW1-A00 is a color active matrix thin film transistor (TFT) liquid crystal display
(LCD) that uses amorphous silicon TFT as a switching device. This model is composed of a TFT LCD panel, the
voltage reference, common voltage, DC-DC converter, column, and row driver circuit. This TFT LCD has a 19-inch
diagonally measured active display area with WXGA+ resolution (900 vertical by 1440 horizontal pixel array).
4.3.1 Display Characteristics

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4.3.2 Optical Characteristics

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4.3.3 Parameter guide line for CCFL Inverter
TFT LCD Module:
Back Light Unit:

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5. Block Diagram
5.1 Software Flow Chat
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N16
17
19
Y
N
18

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1) MCU initialize.
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

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5.2 Electric Block Diagram
5.2.1 Main Board
EEPROM
AT24C16AN-10SU-2.7
(
U403
)
Panel Interface
(CN406)
NT68663MEFG
(Include MCU, ADC, OSD)
(
U401
)
D-Sub Connector
(CN405)
EEPROM M24C02
(
U405
)
SDA
SCL RXD
TXD RGB H-SYNC
V-SYNC
DB15_SDA
DB15_SCL
Crystal 12MHz
(
X
4
01
)
Keypad Interface
(CN403)

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5.2.2 Inverter / Power Board
AC inlet Filter Rectifier and
filter
Start circuit R904, R931, R938
Transform
er
Switching circuit
PWM control
IC&MOSFET
Rectifier and
filter D908,
D909
Feedback
circuit IC902,
IC903
12V/5V
Start circuit
On/off control
PWM control IC Push-pull
circuit LC resonant Lamp
Dimming control Feedback circuit
To main board
12V
OVP/OCP circuit

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6. Schematic
6.1 Main Board

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