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17" LCD Color Monitor AOC 712Sa
HZ
Service
Service
Service
Horizontal Frequency
30kHz 80kHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents..........................................................1 6.Schematic......................................................17
Revision List.............................................................2 6.1 Main Board..........................................................17
Important Safety Notice.............................................3 6.2 Power Board.....................................................21
1. Monitor Specification...............................................4 6.3 Audio Board....................................................23
2. LCD Monitor Description........................................5 7.PCB Layout...........................................................24
3. Operation Instruction............................................6 7.1 Main Board........................................................24
3.1 General Instructions.........................................6 7.2 Power Board.................................................26
3.2 Control Button......................................................6 7.3 Audio Board.................................................28
3.3 Adjusting the Picture..........................................8 7.4 Key Board...................................................28
4. Input/Output Specification.......................................10 8. Maintainability................................................29
N
4.1 Input Signal Connector.........................................10 8.1 Equipments and Tools Requirement....................29
4.2 Factory Preset Display Modes.........................10 8.2 Trouble Shooting................................................30
4.3 Panel Specification.........................................11 9. White-Balance, Luminance adjustment.............36
5. Block Diagram.....................................................13 10. Monitor Exploded View.....................................37
5.1 Soft Flow Chart..................................................13 11. BOM List..............................................................39
5.2 Electrical Block Diagram......................................15
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.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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17" LCD Color Monitor AOC 712Sa
Revision List
Revision Date Revision History TPV Model
A00 Feb.-07-07 Initial Release T76CNMNQF6AO8P
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17" LCD Color Monitor AOC 712Sa
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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17" LCD Color Monitor AOC 712Sa
1. Monitor Specifications
Driving system TFT Color LCD
LCD Panel Size 43.2cm(17.0")
Pixel pitch 0.264mm( H ) × 0.264mm( V )
Video R,G,B Analog Interface
Separate Sync. H/V TTL
Input
H-Frequency 30kHz 80kHz
V-Frequency 55-75Hz
Display Colors 16.2M Colors
Dot Clock 135MHz
Max. Resolution 1280 × 1024
Plug & Play VESA DDC2BTM
ON Mode 37W
EPA ENERGY STARŽ
OFF Mode 1W
Input Connector 15-pin D-Sub
Analog:0.7Vp-p(standard),
Input Video Signal
75 OHM, Positive
Horizontal : 337.92mm
Maximum Screen Size
Vertical : 270.34mm
Power Source 100~240VAC,50~60Hz
Operating Temp: 5° to 35°C
Environmental
Storage Temp.: -20° to 60°C
Considerations
Operating Humidity: 10% to 85%
Dimension 371(W)×380(H)×106.4(D)mm
Weight (N. W.) 4.5kg Unit (net)
Rated Power 1.5 W rms
Audio Output
(Per channel)
Power Consumption( Maximum ) 37 Watts
Regulatory Compliance cULus, TUV-S
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17" LCD Color Monitor AOC 712Sa
2. LCD Monitor Description
The LCD monitor will contain a main board, a power board, a key board and an audio 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
CCFL Drive. Flat Panel and
CCFL backlight
RS232 Connector
Power board
Main Board For white balance
(Include: adapter, inverter)
adjustment in factory
mode
Key board Audio board
AC-IN Video signal, DDC
100V-240V
HOST Computer
5
17" LCD Color Monitor AOC 712Sa
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor. By changing these settings, the picture can be adjusted to your personal preferences.
ˇ The power cord should be connected.
ˇ Connect the video cable from the monitor to the video card.
ˇ Press the power button to turn on the monitor position. 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
1. AC Power Cord
2. D-Sub Cable
3. Audio Cable
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17" LCD Color Monitor AOC 712Sa
FRONT PANEL CONTROL
ˇ Power Button / Power Indicator:
Press this button to turn the monitor ON or OFF.
Blue -- Power On mode.
Orange -- Off mode.
ˇ 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.
ˇ > /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.
ˇ < /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.
ˇ 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
ˇ 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.
ˇ Save the original shipping carton and packing materials, as they will come in handy if you ever have to ship your
monitor.
ˇ For maximum protection, repackage your monitor as it was originally packed at the factory.
ˇ 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.
ˇ 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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17" LCD Color Monitor AOC 712Sa
3.3 Adjusting the Picture
Press the MENU-button to activate the OSD window.
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 descriptions for function control LEDS
Main Menu Main Menu Sub Menu Sub Menu
Description
Item Icon Item Icon
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.
Color Temp.
User / Red Red Gain from Digital-register.
User / Green Green Gain Digital-register.
User / Blue Blue Gain from Digital-register.
Auto Config Yes N/A Auto Adjust the H/V Position, Focus and Clock of picture.
No N/A Do not execute Auto Config, return to main menu.
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17" LCD Color Monitor AOC 712Sa
Main Menu Main Sub Menu
Sub Menu Icon Description
Item Menu Icon Item
H. Position Adjust the horizontal position of the OSD.
OSD Setup V. Position Adjust the vertical position of the OSD.
OSD Timeout Adjust the OSD timeout.
Language Language N/A Select the language you like.
Show the resolution, H/V frequency and input
Information Information N/A
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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17" LCD Color Monitor AOC 712Sa
4. Input/Output Specification
4.1 Input Signal Connector
Pin No. Description Pin No. Description
1. Red Video 9. + 5V
2. Green Video 10. Detect Cable
3. Blue Video 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
Analog Connector
1 5
6 10
11 15
4.2 Factory Preset Display Modes
Horizontal Vertical
Standard Resolution Frequency 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
XGA 1024 × 768 56.476kHz 70.0Hz
1024 × 768 60.021kHz 75.0Hz
1280 × 1024 64.000kHz 60.0Hz
SXGA
1280 × 1024 80.000kHz 75.0Hz
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17" LCD Color Monitor AOC 712Sa
4.3 Panel Specification
CLAA170EA07P is 17.0" color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD
panel, driver ICs, control circuit and backlight. By applying 8 bit digital data,1280×1024, 16.2M-color images are
displayed on the 17.0" diagonal screen. Input power voltage is 5.0V for LCD driving. Inverter for backlight is not
included in this module.
4.3.1 Display Characteristics
4.3.2 Optical Characteristics
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17" LCD Color Monitor AOC 712Sa
4.3.3 ELECTRICAL CHARACTERISTICS
TFT LCD Module:
Back Light Unit:
12
17" LCD Color Monitor AOC 712Sa
5. Block Diagram
5.1 Software Flow Chart
1
2 Y
3
N
4
5 N
Y
6
7 N
8
Y
9
10 N
11
Y
N N
12 13
Y Y
14 15 N
16
Y
17
N
18 19
Y
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17" LCD Color Monitor AOC 712Sa
1) MCU initializes.
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
disappears.
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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17" LCD Color Monitor AOC 712Sa
5.2 Electrical Block Diagram
5.2.1 Main Board
Panel Interface
(CN406)
NT68623MEFG-64/G
Keypad Interface
(Include MCU, ADC, OSD)
(CN403)
(U401)
SDA
SCL RXD H-SYNC
TXD RGB V-SYNC
EEPROM
Crystal 12MHz D-Sub Connector
AT24C16AN-10SU-2.7
(U403) (X401) (CN405)
DB15_SDA
DB15_SCL
EEPROM
M24C02-WMN6TP
(U405)
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17" LCD Color Monitor AOC 712Sa
5.2.2 Inverter/Power Board
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17" LCD Color Monitor AOC 712Sa
6. Schematic
6.1 Main Board
+5V
R496
1K 1/16W
VGA-5V C409
0.1uF/16V
R416 ZD412
1
2
CN405 0 1/16W UDZS5.6B
DB15 GND_A
16
R441 R426
220 1/16W 10 1K 1/16W
VGA-SCL 15 5 D406 GND_A
VGA-SCL VGA-DET
9 BAV99
VS 14 4 FB401
3
8 0 1/16W
ZD407 HS 13 3 B1 ZD405 B1
BI1
UDZS5.6B 7 UDZS5.6B ZD414
12 2 G1 UDZS5.6B
6 R455 CH201209T-300 C451
11 1 R1 75 1/16W NC
GND_A GND_A
BI1-
DB15 GND_A
17
FB402
R440 GND_A 0 1/16W
220 1/16W
VGA-SDA M_TXD
GND_A
VGA-SDA
M_RXD
C410
0.1uF/16V
ZD404
UDZS5.6B ZD406 ZD403
1
2
UDZS5.6B UDZS5.6B
C433 C434 GND_A
NC NC
GND_A FB403
D405 0 1/16W
G1 BAV99
GI1
3
GND_A GND_A
R454 CH201209T-300 C452
75 1/16W NC
GI1-
FB406
GND_A 0 1/16W
D416 R406
BAV70 100 1/16W C411
VGA-5V VS 0.1uF/16V
VSIN
4.7K 1/16W
R478
1
2
ZD401 R435 C402
+5V UDZS5.6B 2.2K 1/16W 0.001uF GND_A
C446
GND_A 0.1uF/16V FB404
D404 0 1/16W
R479 R476 GND_A GND_A GND_A R1 BAV99
RI1
U405 4.7K 1/16W R405
3
24C02 10K 1/16W 100 1/16W
HS R456 CH201209T-300 C453
1 8 HSIN 75 1/16W NC
2 A0 VCC 7
A1 WP VGA-SCL 24C02_WP RI1-
3 6 ZD402 R436 C430
4 A2 SCLK 5 VGA-SDA UDZS5.6B 2.2K 1/16W 22pF FB405
GND SDA GND_A 0 1/16W
GND_A GND_A GND_A GND_A
Title
715G1767-1
Size Document Number Rev
A4 0.1
ADC Input
Date: Friday, January 06, 2006 Sheet 1 of 5
17
17" LCD Color Monitor AOC 712Sa
MCU-VDD
VSO T0M
T0P
HSO T1M
T1P
Q402
T2M
R418 10K 1/16W LEDG SCL
T2P
LED-Green R437 SDA TCLK1M
220 1/16W PMBS3906
Q404
TCLK1P
R419 10K 1/16W LEDA
RSTn T3M
LED-Orange T3P
R438 220 1/16W PMBS3906
IRQn T4M
T4P
T5M
RX2+ CVDD1V8 T5P
RX2+ RX2- DVDD T6M
RX2- RX1+ T6P
RX1+ RX1- TCLK2M
RX1- RX0+ TCLK2P
RX0+ RX0- T7M
RX0- RXC+ T7P
FB704 RXC+ RXC-
ADC_VAA RXC-
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86