AOC 2212PH Schematic

22" LCD Color Monitor AOC 2212ph

Service

Horizontal Frequency

TABLE OF CONTENTS

30kHz – 83kHz

Description

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

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.

SAFETY NOTICE

Page Description Page

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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22" LCD Color Monitor AOC 2212ph

Revision List

Version Release Date Revision History TPV Model Name

A00 Jul.-24-07 Initial release

A01 Sep.-20-07 ADD TPV MODEL IN ITEM 12 TC6MM3DLWJCKDN

TC6MM3DTWJWRDN

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22" LCD Color Monitor AOC 2212ph

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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22" LCD Color Monitor AOC 2212ph

1. Monitor Specifications

Driving system TFT Color LCD

LCD Panel

Input

Display Colors 16.7M Colors

Dot Clock 165MHz

Max. Resolution 1680 x 1050@60Hz

Plug & Play VESA DDC2BTM

Power Consumption

Input Connector

Input Video Signal

Maximum Screen Size

Power Source 100~240VAC, 47~63Hz

Environmental

Considerations

Weight (N. W.): 6kg

Dimensions 505.2(W)x428.32(H)x210.82(D)mm

Power Consumption (Maximum)

Size 55.8cm(22")

Pixel Pitch 0.282mm(H) × 0.282mm(V)

Video

Separate Sync. H/V TTL

H-Frequency 30kHz – 83kHz

V-Frequency 55-75Hz

ON Mode ≤49W(max)

OFF Mode ≤2W

R, G, B Analog Interface

Digital Interface

D-Sub 15pin DVI 24pin Analog:0.7Vp-p(standard),

75 OHM, Positive Digital signal Horizontal : 473mm

Vertical : 296mm

Operating Temp: 5° to 40°C Storage Temp.: -20° to 60°C Operating Humidity : 15% to 90%

49Watts

Regulatory Compliance

CE, FCC, TCO03

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22" LCD Color Monitor AOC 2212ph

(

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.

Power board

Include: adapter, inverter)

AC-IN

100V-240V

Monitor Bl ock Diagram

CCFL Drive.

Key Board

Flat Panel and

CCFL backlight

Main Board

HOST Computer

RS232 Connector

For white balance

adjustment in factory

mode

Video signal, DDC

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22" LCD Color Monitor AOC 2212ph

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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22" LCD Color Monitor AOC 2212ph

 < / 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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22" LCD Color Monitor AOC 2212ph

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

Luminanc

e

Main

Menu

Icon

Sub

Menu

Item

Brightness

Contrast

Eco

Sub Menu

Description

Backlight Adjustment

Standard Standard Mode

Text Text Mode

Internet Internet Mode

Game Game Mode

Movie Movie Mode

Contrast from Digital-register.

Gamma

DCR

Sports Sports Mode

Gamma1 Adjust to Gamma1

Gamma2 Adjust to Gamma 2

Gamma3 Adjust to Gamma 3

Off Disable dynamic contrast ratio

On Enable dynamic contrast ratio

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22" LCD Color Monitor AOC 2212ph

Main

Menu

Item

Audiu

Control

Image

Setup

Main

Menu Icon

Sub Menu

Item

Volume Adjust volume.

Balance

Bass Adjust bass.

Treble Adjust treble.

Clock

Focus

H.Position

V.Position

Warm

Adjust picture Clock to reduce

Adjust Picture Phase to reduce

Adjust the vertical position of the

Adjust the horizontal position of the

Recall Warm Color Temperature from

Sub Menu

Adjust balance.

Vertical-Line noise.

Horizontal-Line noise

picture.

EEPROM.

Description

Color

Te mp .

Main

Menu

Item

Color

Boost

Main

Menu Icon

Normal

Cool

sRGB

User

Sub Menu

Item

Full

Enhance

Nature Skin on or off Disable or Enable Nature Skin Mode

Recall Normal Color Temperature from

EEPROM.

Recall Cool Color Temperature from

EEPROM.

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

User-M Magenta Gain from Digital-register

Sub Menu Description

on or off Disable or Enable Full Enhance Mode

Green Field on or off Disable or Enable Green Field Mode

Sky-blue on or off Disable or Enable Sky-blue Mode

AutoDetect on or off Disable or Enable AutoDetect Mode

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22" LCD Color Monitor AOC 2212ph

Demo on or off Disable or Enable Demo

Frame Size

Brightness

Contrast

Picture

Boost

Main

Menu

Item

OSD

Setup

Main

Menu

Icon

Hue

Saturation

Position

Bright

Frame

Sub Menu

Item

H.Position

V.Position

Timeout

Sub Menu Description

Adjust the vertical position of OSD

Adjust the horizontal position of OSD

Adjust the OSD Timeout

Adjust Frame Size

Adjust Frame Brightness

Adjust Frame Contrast

Adjust Frame Hue

Adjust Frame Saturation

Adjust Frame Position

Disable or Enable Bright Frame

Extra

Language

Input Select

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

Information

HDMI Select HDMI Sigal Source as Input

Ypbpr Select Ypbpr Sigal Source as Input

Digital Select Digital Sigal Source as Input

Analog Select Analog Sigal Source as Input

Show the information of the main image and

Select the OSD language

sub-image source

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22" LCD Color Monitor AOC 2212ph

4. Input/Output Specification

4.1 Input Signal Connector

Analog connectors

15

6

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

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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.

4. TMDS Data 4- 16. Hot Plug Detect

5. TMDS Data 4+ 17. TMDS Data 0-

6. DDC Clock 18. TMDS Data 0+

TMDS Data 2/4

15. Ground(for+5V)

Shield

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

TMDS Data 1/3

11.

23. TMDS Clock +

Shield

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22" LCD Color Monitor AOC 2212ph

12. TMDS Data 3- 24. TMDS Clock -

4.2 Factory Preset Display Modes

STANDARD

VGA

SVGA

XGA

SXGA

WXGA+ 1440x900 55.930kHz 60 Hz

WSXGA 1680x1050 65.290kHz 60Hz

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

RESOLUTION

PC MODES

640x480 31.469kHz 60 Hz

640x480 37.861kHz 72 Hz

640x480 37.500kHz 75 Hz

800x600 35.156kHz 56 Hz

800x600 37.879kHz 60 Hz

800x600 48.077kHz 72 Hz

800x600 46.875kHz 75 Hz

1024x768 48.363kHz 60 Hz

1024x768 56.476kHz 70 Hz

1024x768 57.700kHz 72 Hz

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

1280x960 60.000kHz 60 Hz

HDMI & YPbPr MODES

HORIZONTAL

FREQUENCY

VERTICAL

FREQUENCY

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22" LCD Color Monitor AOC 2212ph

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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22" LCD Color Monitor AOC 2212ph

4.3.4 Optical Characteristics

4.3.5 Electrical Characteristics

(1) TFT-LCD

(2) Backlight

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22" LCD Color Monitor AOC 2212ph

5. Block Diagram

5.1 Software Flow Chat

1

2

N

4

5

Y

6

7

Y

9

Y

N

3

15

N

13

15

11

17

N

Y

N

Y

16

10

Y

N

18

N

12

Y

14

19

Y

22" LCD Color Monitor AOC 2212ph

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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22" LCD Color Monitor AOC 2212ph

5.2 Electrical Block Diagram

5.2.1 Main Board

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22" LCD Color Monitor AOC 2212ph

5.2.2 Inverter/Power Board

Lamp

Bridge

EMI filter

Start Circuit: R904,R932,R933

Output

Circuit

Feedback Circuit

Rectifier and Filter

PWM Control IC

Over Voltage

Transformer

MOSFET

PWM Control IC

Rectifier diodes

Feedback

Circuit

12V

ON/OFF

Control

DIM

CN902

5V

ON/OFF

CN902

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22" LCD Color Monitor AOC 2212ph

6. Schematic

6.1 Main Board

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22" LCD Color Monitor AOC 2212ph

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