AOC 177Pk User manual

17” LCD Color Monitor AOC 177Pk
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Service
Service
Service
Horizontal Frequency
30-83 kHz
TABLEOFCONTENTS
Description Page Description Page
N
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...........................…............7
4.Input/Output Specification............……………............9
4.1.Input Signal Connector............………….................9
4.2 Power Supply Requirement…………………………10
4.3.Factory Preset Display Modes.........................10
4.4.Panel Specification.....……...……………..................11
5.Block Diagram………...................…………................13
5.1.Software Flow Chart………………………...........13
5.2.Electrical Block Dia
g
ram…………………..…...........15
6.Schematic…………………...................................…17
6.1.Main Board.................................................17
6.2. Audio Board.....………..…....................................22
6.3. Power Board....…..….….......................................23
7.PCB Layout..……………….......................................25
7.1.Main Board……………........................................25
7.2.Power Board…............................................27
7.3.Audio Board…............................................29
7.4.Key Board…………...…….....................................29
8.Maintainability…………….........................................30
8.1.Equipments and Tools Requirement...............30
8.2.Trouble Shooting…………..............................31
9.White-Balance Luminance adjustment………….....37
10.Monitor Exploded View……………………….........39
11.BOM List….....................................................42
12.Different Parts List……………………………………54
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Revision Date Revision History TPV Model
A00 Jun.-18-07 First Version Release T76CRTDBF1ACA
A01 Dec.-10-07 Second Release T76CRTDBF1A2E

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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
Items Descriptions
LCD Panel
Driving system TFT Color LCD
Type CLAA170EA07
Size 43.2cm 17"
Pixel pitch 0.264mm( H )x 0.264mm( V )
Viewable angle 160˚(H) 160˚(V) (CR≥10)
Response time (type) 5 ms for CPT
Input
Video
R,G,B Analog Interface
Digital Interface
Connector
15-pin D-Sub
DVI 24pin
Video Signal
Analog:0.7Vp-p(standard),
75 OHM, Positive and TMDS
Digital signal
Sync. Type H/V TTL
H-Frequency 30kHz – 83kHz
V-Frequency 55-75Hz
Power
Consumption
ON Mode ≤37W
OFF Mode ≤1W
Contrast Ratio 700:1
Dot Clock 135 MHz
White Luminance 300cd/m2
Max. Resolution 1280 x1024
Display Color 16.7M colors
Plug & Play VESA DDC2BTM
Power Source 100~240VAC,47~63Hz
Maximum Screen
Size
Horizontal : 337.96 mm
Vertical: 270.34 mm
Environmental
Considerations
Operating Temp: 5°C to 35°C
Storage Temp: -20°C to 60°C
Operating Humidity: 10% to 85%

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2. LCD Monitor Description
The LCD MONITOR will contain a main board, an audio board, a power 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: ada
p
ter, inverter
)
Flat Panel and
CCFL backlight
RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
Video signal, DDC
Key Board
HOST Computer
Audio Board
Main 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 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
Item Name Within OSD Without OSD
1 > / Audio
1.Move the cursor up
2.Increase the value of the selected item Activate the audio menu
2 < / audio 1.Move the cursor down
2.Decrease the value of the selected item Activate the audio menu
3 Power Power On / Off Power On / Off
4 Menu/Enter Select Function or select Sub menu Activate OSD main menu
5 Auto/Exit Exit OSD or back to previous menu Auto configuration

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3.3 Adjusting the Picture
OSD functions
Main Menu Item
Main
Menu
Icon
Sub Menu
Item
Sub
Menu
Icon
Description
Luminance
Contrast
Contrast from Digital-register.
Brightness
Backlight Adjustment
Image Setup
Focus
Adjust Picture Phase to reduce Horizontal-Line noise
Clock
Adjust picture Clock to reduce Vertical-Line noise.
Image Position
H. Position
Adjust the horizontal position of the picture.
V. Position
Adjust the vertical position of the picture.
Color Temp.
Warm N/A Recall warm Color Temperature from EEPROM.
Cool N/A Recall cool Color Temperature from EEPROM.
sRGB N/A Recall sRGB Color Temperature from EEPROM.
User / Red
Red Gain from Digital-register.
User / Green
Green Gain Digital-register.
User / Blue
Blue Gain from Digital-register.

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Input Select
Analog N/A Select input signal from analog source (D-Sub)
Digital N/A Select input signal from digital source (DVI)
OSD Setup
H. Position
Adjust the horizontal position of the OSD.
V. Position
Adjust the vertical position of the OSD.
OSD Timeout
Adjust the OSD timeout.
Language
Language N/A Select the language you like.
Information
Information N/A
Show the resolution, H/V frequency and input port of
current input timing.
Reset
Yes N /A
Clear each old status of Auto-configuration and set
the color temperature to Cool.
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
1. D-SUB 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. DDC-Return 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA connector layout
2. DVI-D connector
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. GND (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. NC 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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4.2 Power Supply Requirement
A/C Line voltage range : 100 V ~ 240 V
A/C Line frequency range : 50 ±3Hz, 60 ±3Hz
Current : TBD
Peak surge current : < 55A peak at 240 VAC and cold starting
Leakage current : < 3.5mA
Power line surge : No advance effects (no loss of information or defect) with a
maximum of 1 half-wave missing per second
DC output Voltage : 12VDC ± 5％
Current (max) : 3.5 Amp (12V)
4.3. Factory Preset Display Modes
Standard Resolution Horizontal
Frequency
Vertical
Frequency
Dos-mode 720 × 400 31.47kHz 70.0Hz
VGA
640 × 480 31.47kHz 60.0Hz
640 × 480 37.50kHz 75.0Hz
SVGA
800 × 600 37.879kHz 60.0Hz
800 × 600 46.875kHz 75.0Hz
XGA
1024 × 768 48.363kHz 60.0Hz
1024 × 768 56.476kHz 70.0Hz
1024 × 768 60.02kHz 75.0Hz
1024 × 768 48.780 kHz 60.0Hz
1024 × 768 60.241 kHz 75.0Hz
SXGA 1280 × 1024 64.00 kHz 60.0Hz
1280 × 1024 80.00 kHz 75.0Hz

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4.4 Panel Specification
CLAA170EA07P2 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, 16.7M-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. General specification are summarized in the following table:
4.4.1 Display Characteristics
4.4.2 Optical Characteristics
Ta=2 5℃，VCC=5.0V

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4.4.3 Electrical Characteristics
1. TFT LCD Module
2. Backlight Unit

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5. Block Diagram
5.1 Software Flow Chat
1
2
N
Y
5
Y
N
1
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
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 Electrical Block Diagram
5.2.1 Main Board
Flash Memory
AT24C16AN
(U302)
EEPROM
M24C02
(U702)
MCU
RTD2120L
(U402)
Scalar IC RTD2525L
(Included ADC, OSD)
(U401)
D-Sub
Connector
(CN702)
H sync
V sync
RGB
DDC1_SDA,
DDC1_SCL
EPR_SDA
EPR_SCL
PANEL
(CN504)
Key Board
Control
Crystal
24MHZ
(X301)
CLKOUT
EEPROM
M24C02
(U701)
D-DVI
Connector
(CN701)
DDC2_SDA,
DDC2_SCL

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5.2.2 Inverter/Power Board
DIM
DIM
EMI filter
Start Circuit: R911
PWM
Control IC
Transformer
AC input
12V
ON/OFF
Control
PWM
Control IC
Feedback
Circui
t
Output
Circuit Transformer MOSFET
Over
Voltage
Lamp
ON/OFF
5V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes
CN902

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6. Schematic
6.1 Main Board

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