AOC 2212PH User manual

22" LCD Color Monitor AOC2212ph
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Service
Service
Service
Horizontal Frequency
30kHz – 83kHz
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.OSD Menu…………….…...........................…............8
4.Input/Output Specification............……………............11
4.1.Input Signal Connector............…………................11
4.2.Factory Preset Display Modes..........................12
4.3.Panel Specification.....………………..................13
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....……....................................27
7.PCB Layout..………….......................................29
7.1.Main Board………........................................29
7.2 Power Board....……....................................30
7.3.Key Board…………….....................................31
8.Maintainability……….......................................32
8.1.Equipments and Tools Requirement...............32
8.2.Trouble Shooting…………..............................33
9.White-Balance, Luminance adjustment.............39
10.Monitor Explode View………..…….…............41
11.BOM List…………………………………............43
12. Different Parts List……………………………...65
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Version Release Date Revision History TPV Model Name
A00 Jul.-24-07 Initial release
TC6MM3DTWJWRDN
A01 Sep.-20-07 ADD TPV MODEL IN ITEM 12 TC6MM3DLWJCKDN

22" LCD Color Monitor AOC2212ph
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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 55.8cm(22")
LCD Panel
Pixel Pitch 0.282mm(H) × 0.282mm(V)
R, G, B Analog Interface
Video Digital Interface
Separate Sync. H/V TTL
H-Frequency 30kHz – 83kHz
Input
V-Frequency 55-75Hz
Display Colors 16.7M Colors
Dot Clock 165MHz
Max. Resolution 1680 x 1050@60Hz
Plug & Play VESA DDC2B
TM
ON Mode ≤49W(max)
Power Consumption OFF Mode ≤2W
D-Sub 15pin
Input Connector DVI 24pin
Analog:0.7Vp-p(standard),
75 OHM, Positive
Input Video Signal
Digital signal
Maximum Screen Size Horizontal : 473mm
Vertical : 296mm
Power Source 100~240VAC, 47~63Hz
Environmental
Considerations
Operating Temp: 5° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity : 15% to 90%
Weight (N. W.): 6kg
Dimensions 505.2(W)x428.32(H)x210.82(D)mm
Power Consumption (Maximum) 49Watts
Regulatory Compliance CE, FCC, TCO03

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2. LCD Monitor Description
The LCD monitor will contain a main 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.
AC-IN
100V-240V
Power board
(
Include: ada
p
ter
,
inverter
)
Flat Panel and
CCFL backlight
Main Board RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
Video signal, DDC
Monitor Block Diagram
Key Board
HOST Computer

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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 the front of the 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
3.2.1 Key Control
EXTERNAL CONTROLS
1. Auto Adjust button / Exit
2. < / Volume- , > / Volume+
3. MENU /ENTER
4. Input Select
5. Power button
6. LED
FRONT PANEL CONTROL
Power Button:
Press this button to switch ON/OFF of monitor’s power.
MENU / ENTER :
Active OSD menu or function adjust confirm or Exit OSD menu when in Contrast /Brightness OSD status.

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< / Volume- , > / 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.
.
Input Select:
Select the VGA / DVI/YPBPR or HDMI function.
Power Indicator:
Green — Power On mode.
Orange —Off mode.
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 to activate the Auto Adjustment function.
The Auto Adjustment function is used to optimized 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 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 OSD Settings
1. Press the MENU-button to activate the OSD window (Figure 5).
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.
ADJUSTING THE PICTURE
The descriptions for function control LEDS
Main
Menu
Item
Main
Menu
Icon
Sub
Menu
Item
Sub Menu
Description
Brightnes
s
Backlight Adjustment
Contrast Contrast from Digital-register.
Standard Standard Mode
Text Text Mode
Internet Internet Mode
Game Game Mode
Movie Movie Mode
Eco
Sports Sports Mode
Gamma1 Adjust to Gamma1
Gamma2 Adjust to Gamma 2
Gamma
Gamma3 Adjust to Gamma 3
Off Disable dynamic contrast ratio
Luminanc
e
DCR
On Enable dynamic contrast ratio

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Main
Menu
Item
Main
Menu Icon
Sub Menu
Item
Sub Menu
Description
Volume Adjust volume.
Balance Adjust balance.
Bass Adjust bass.
Audiu
Control
Treble Adjust treble.
Clock Adjust picture Clock to reduce
Vertical-Line noise.
Focus Adjust Picture Phase to reduce
Horizontal-Line noise
H.Position Adjust the vertical position of the
picture.
Image
Setup
V.Position Adjust the horizontal position of the
picture.
Warm Recall Warm Color Temperature from
EEPROM.
Normal Recall Normal Color Temperature from
EEPROM.
Cool Recall Cool Color Temperature from
EEPROM.
sRGB Recall SRGB Color Temperature from
EEPROM.
User-B Blue Gain from Digital-register
User-G Green Gain Digital-register.
User-R Red Gain from Digital-register
User-Y Yellow Gain from Digital-register
User-C Cyan Gain from Digital-register
Color
Te m p.
User
User-M Magenta Gain from Digital-register
Main
Menu
Item
Main
Menu Icon
Sub Menu
Item Sub Menu Description
Full
Enhance on or off Disable or Enable Full Enhance Mode
Nature Skin on or off Disable or Enable Nature Skin Mode
Green Field on or off Disable or Enable Green Field Mode
Sky-blue on or off Disable or Enable Sky-blue Mode
Color
Boost
AutoDetect on or off Disable or Enable AutoDetect Mode

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Demo on or off Disable or Enable Demo
Frame Size Adjust Frame Size
Brightness Adjust Frame Brightness
Contrast Adjust Frame Contrast
Hue Adjust Frame Hue
Saturation Adjust Frame Saturation
Position Adjust Frame Position
Picture
Boost
Bright
Frame
Disable or Enable Bright Frame
Main
Menu
Item
Main
Menu
Icon
Sub Menu
Item
Sub Menu Description
H.Position Adjust the vertical position of OSD
V.Position Adjust the horizontal position of OSD
Timeout Adjust the OSD Timeout
OSD
Setup
Language Select the OSD language
HDMI Select HDMI Sigal Source as Input
Ypbpr Select Ypbpr Sigal Source as Input
Digital Select Digital Sigal Source as Input
Input Select
Analog Select Analog Sigal Source as Input
Auto Config Auto adjust the picture to default
DDC/CI Turn ON/OFF DDC/CI Support
Reset yes or no Reset the menu to default
Extra
Information Show the information of the main image and
sub-image source

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4. Input/Output Specification
4.1 Input Signal Connector
Analog connectors
15
610
11 15
15 - Pin Color Display Signal Cable
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
24 - Pin Color Display Signal Cable
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 +

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12. TMDS Data 3- 24. TMDS Clock -
4.2 Factory Preset Display Modes
STANDARD RESOLUTION HORIZONTAL
FREQUENCY
VERTICAL
FREQUENCY
PC MODES
640x480 31.469kHz 60 Hz
640x480 37.861kHz 72 Hz
VGA 640x480 37.500kHz 75 Hz
800x600 35.156kHz 56 Hz
800x600 37.879kHz 60 Hz
800x600 48.077kHz 72 Hz
SVGA
800x600 46.875kHz 75 Hz
1024x768 48.363kHz 60 Hz
1024x768 56.476kHz 70 Hz
1024x768 57.700kHz 72 Hz
XGA
1024x768 60.023kHz 75 Hz
1280x1024 63.981kHz 60 Hz
1280x1024 74.40kHz 70 Hz
1280x1024 77.900kHz 72 Hz
1280x1024 79.976kHz 75 Hz
SXGA
1280x960 60.000kHz 60 Hz
WXGA+ 1440x900 55.930kHz 60 Hz
WSXGA 1680x1050 65.290kHz 60Hz
HDMI & YPbPr MODES
480i 720x480 i 15.75 kHz 60 Hz
480P 720x480P 31.47 kHz 60 Hz
720P 1280x720P* 45.00 kHz 60 Hz
1080i 1920x1080i* 33.75 kHz 60 Hz
1080P 1920x1080P 67.5 0kHz 60 Hz
576P 720x576P 31.25 kHz 50 Hz
576I 720x576i 31.25 kHz 50 Hz
720P 1280x720 37.50 kHz 50 Hz
1080P 1920x1080P 56.25 kHz 50 Hz

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4.3 Panel Specification
4.3.1 General Features
The M220Z1-L01 model is a 22 inch wide TFT-LCD module with a 4-CCFL Backlight Unit and a 30-pin
2ch-LVDS interface. This module supports 1680 x 1050 WSXGA+ (16:10 wide screen) mode and displays
up to 16.7 millions colors. The inverter module for the Backlight Unit is not built in.
4.3.2 Features
- Super wide viewing angle
- High contrast ratio
- Fast response time
- High color saturation (EBU Like Specifications)
- WSXGA+ (1680 x 1050 pixels) resolution
- DE (Data Enable) only mode
- LVDS (Low Voltage Differential Signaling) interface
4.3.3 Display Characteristics

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4.3.4 Optical Characteristics
4.3.5 Electrical Characteristics
(1) TFT-LCD
(2) Backlight

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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 Electrical Block Diagram
5.2.1 Main Board

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5.2.2 Inverter/Power Board
CN902
CN902
DIM
DIM
EMI filter
Start Circuit: R904,R932,R933
PWM
Control IC
Transformer
12V
ON/OFF
Control
PWM
Control IC
Feedback
Circuit
Output
Circuit Transformer MOSFET
Over
Voltage
Lamp
ON/OFF
5V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes

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6. Schematic
6.1 Main Board

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