AOC 172V Service Manual
17" LCD Color Monitor AOC 172V
1
Service
Service
Horizontal Frequency
30-80 kHz
TABLE OF CONTENTS
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
1. Monitor Specification.................................………........3
2.LCD Monitor Description…………………………….......4
3. Operation Instruction…………...................…...........5
3.1 General Instructions.....................................…...........5
3.2 Control Button……………………………..……...........5
3.3 Adjusting the Picture...........................…............5
4. Input/Output Specification............……………............7
4.1 Input Signal Connector............…..……................7
4.2 Factory Preset Display Modes.........................7
5 Panel Specification.....…………………........................8
5.1 Display Characteristics………………………………8
5.2 Optical Characteristics………………………………..8
5.3 Parameter guide line for CCFL Inverter……………..9
6.Block Diagram…….…................………….........10
6.1 Software Flow Chat…….…..........………….........10
6.2 Electrical Block Diagram………...………...…......12
7. Schematic……………………………………………. 14
7.1 Main Board…………..............................................14
7.2 Power Board....……………....................................19
8. PCB Layout..………….......................................21
8.1 Main Board……………......................................21
8.2 Power Board…......................................................24
8.3 Key Board…………………...................................27
9. Maintainability……….......................................28
9.1. Equipments and Tools Requirement.....................28
9.2. Trouble Shooting…………....................................29
10. White-Balance, Luminance adjustment.................34
11.Monitor Exploded View……..……………............35
12. BOM List....……....................................................36
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
17" LCD Color Monitor AOC 172V
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Revision List
Revision Date Revision History TPV Model
A00 Mar.-03-2008 Initial release T78SM5NCARSPNNE
17" LCD Color Monitor AOC 172V
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1. Monitor Specifications
Driving system TFT Color LCD
Size 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V )
LCD Panel
Video R,G,B Analog Interface
Separate Sync. H/V TTL
H-Frequency 30kHz – 80kHz
Input
V-Frequency 55Hz-75Hz
Display Colors 16.2M Colors
Dot Clock 135MHz(typ)
Max. Resolution 1280 x 1024@75Hz
Plug & Play VESA DDC2B
TM
ON Mode ≤47W
Power
Consumption
OFF Mode ≤2W
Input Connector D-Sub 15pin
Analog:0.7Vp-p(standard),
Input Video Signal
75 OHM, Positive
Horizontal : 337.92mm
Maximum Screen Size
Vertical : 270.34mm
Power Source 100~240VAC,47~63Hz
Environmental Operating Temp: 5° to 35°C
Storage Temp.: -20° to 60°C
Considerations
Operating Humidity: 10% to 85%
Weight (N. W.) 4.1kg
Dimensions 375.4 (W) x 381.6 (H) x 160 (D)mm
Regulatory Compliance cULus,CE,FCC
17" LCD Color Monitor AOC 172V
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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.
HOST Computer
AC-IN
100V-240V
PWPC board
(Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main Board
RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
Video signal DDC
Monitor Block
Keyboard
17" LCD Color Monitor AOC 172V
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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.
-
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
1 Power Button/ Power Indicator
2. MENU / ENTER
3. Contrast
4. Brightness
5. Auto Config / Exit
3.3 Adjusting the Picture
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.
17" LCD Color Monitor AOC 172V
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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 from EEPROM.
Cool N/A Recall Cool from EEPROM.
sRGB N/A Recall sRGB from EEPROM.
User / Red
Red Gain from Digital-register.
User / Green
Green Gain Digital-register.
Color Temp.
User / Blue
Blue Gain from Digital-register.
Yes
N/A
A
uto 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 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
17" LCD Color Monitor AOC 172V
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4. Input/Output Specification
4.1 Input Signal Connector
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. RXD
4. TXD 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
VGA connector layout
15
6
10
11 15
4.2 Factory Preset Display Modes
STANDARD
RESOLUTION
HORIZONTAL
FREQUENCY
(
kHz
)
VERTICAL
FREQUENCY
(Hz)
Dos-mode
640 × 350 31.47kHz 70Hz
Dos-mode
720 × 400 31.47kHz 70Hz
VGA
640 × 480 31.47kHz 60Hz
640 × 480 35.00kHz 66.6Hz
640 × 480 37.50kHz 75Hz
640 × 480 37.86kHz 72Hz
SVGA
800 × 600 37.879kHz 60Hz
800 × 600 46.875kHz 75Hz
800 × 600 35.16kHz 56Hz
800 × 600 48.01kHz 72Hz
832 × 624 49.725kHz 75Hz
XGA
1024 × 768 48.363kHz 60Hz
1024 × 768 56.476kHz 70Hz
1024 × 768 60.02kHz 75Hz
SXGA
1280 × 1024 64.00kHz 60Hz
1280 × 1024 80.00kHz 75Hz
17" LCD Color Monitor AOC 172V
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5 Panel Specification
5.1 Display Characteristics
5.2 Optical Characteristics
17" LCD Color Monitor AOC 172V
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5.3 Parameter guide line for CCFL Inverter
1.TFT LCD Module:
2.Back Light Unit:
17" LCD Color Monitor AOC 172V
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6. Block Diagram
6.1 Software Flow Chat
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
N
6
4
3
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18
17" LCD Color Monitor AOC 172V
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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?
17" LCD Color Monitor AOC 172V
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6.2 Electric Block Diagram
6.2.1 Main Board
FLASH MEMORY
PM25LV512A (U402)
Scalar TSUM16AK
(Include: MCU, ADC, OSD etc)
(U401)
EEPROM
24C02
(U404)
H sync
V sync
RGB
DB12_SDA,
DB15_SCL
LCD Interface
(CN101)
EEPROM
24C16N
(U403)
D-Sub
Connector
(CN405)
17" LCD Color Monitor AOC 172V
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6.2.2 Inverter / Power Board
EMI filter
Bridge
Rectifier
and Filter
Start Circuit: R905、R906、
R907、R908、R909、R910
PWM
Control IC
Transformer
Over
Voltage
Protect
Rectifier
diode
AC input
5V
12V
ON/OFF Control
PWM
Control IC
Feedback
Circuit
OSC and
Output
Circuit
DC Convert
Circuit
MOSFET
Over Voltage
Protect
Lamp
ON/OFF
DIM
CN102
PWM
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