AOC 2212PH Schematic

22" LCD Color Monitor

AOC 2212ph

Service

Service

Service

Horizontal Frequency

TABLE OF CONTENTS

30kHz – 83kHz

Description

Page

Description

Page

Table Of Contents.......……..............................…........1

5.2.Electrical Block Diagram……………..….......17

Revision

List.…........................................……......2

6.Schematic…………......................................19

Important

Safety Notice.……..................……......3

6.1 Main Board……..............................................19

1.Monitor

Specification..............................………........4

6.2 Power Board....……....................................27

2.LCD Monitor Description…………………………….......5

7.PCB Layout..………….......................................29

3.Operation

Instruction…………...............……...........6

7.1.Main Board………........................................29

3.1.General

Instructions...........................…...........6

7.2 Power Board....……....................................30

3.2.Control Button…………….…..............……...............6

7.3.Key Board…………….....................................31

3.3.OSD Menu…………….…...........................…............8

8.Maintainability……….......................................32

4.Input/Output Specification............……………............11

8.1.Equipments and Tools Requirement...............32

4.1.Input Signal Connector............…………................11

8.2.Trouble Shooting…………..............................33

4.2.Factory Preset Display Modes..........................12

9.White-Balance, Luminance adjustment.............39

4.3.Panel Specification.....………………..................13

10.Monitor Explode View………..…….…............41

5. Block Diagram…..…....................…………...............15

11.BOM List…………………………………............43

5.1.Software Flow Chart……..…………....….......15

12. Different Parts List……………………………...65

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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22" LCD Color Monitor					AOC 2212ph
				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

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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				Size	55.8cm(22")
					Pixel Pitch	0.282mm(H) × 0.282mm(V)
					Video	R, G, B Analog Interface
						Digital Interface
	Input			Separate Sync.		H/V TTL
					H-Frequency	30kHz – 83kHz
					V-Frequency	55-75Hz
		Display Colors				16.7M Colors
		Dot Clock				165MHz
		Max. Resolution				1680 x 1050@60Hz
		Plug & Play				VESA DDC2BTM
	Power Consumption				ON Mode	≤49W(max)
					OFF Mode	≤2W
		Input Connector				D-Sub 15pin
						DVI 24pin
						Analog:0.7Vp-p(standard),
	Input Video Signal					75 OHM, Positive
						Digital signal
	Maximum Screen Size					Horizontal : 473mm
						Vertical : 296mm
		Power Source				100~240VAC, 47~63Hz
		Environmental				Operating Temp: 5° to 40°C
						Storage Temp.: -20° to 60°C
		Considerations
						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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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.

Monitor Block Diagram

		CCFL Drive.					Flat Panel and
							CCFL backlight
Power board					Main Board					RS232 Connector
										For white balance
(Include: adapter, inverter)
										adjustment in factory
										mode
					Key Board
										Video signal, DDC
AC-IN
						HOST Computer
100V-240V

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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.

3.2Control 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	Main	Sub	Sub Menu
Menu	Menu	Menu		Description
Item	Icon	Item
		Brightnes		Backlight Adjustment
		s
		Contrast		Contrast from Digital-register.
			Standard	Standard Mode
			Text	Text Mode
		Eco	Internet	Internet Mode
Luminanc			Game	Game Mode
e			Movie	Movie Mode
			Sports	Sports Mode
			Gamma1	Adjust to Gamma1
		Gamma
			Gamma2	Adjust to Gamma 2
			Gamma3	Adjust to Gamma 3
		DCR	Off	Disable dynamic contrast ratio
			On	Enable dynamic contrast ratio

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22" LCD Color Monitor							AOC 2212ph
	Main	Main	Sub Menu	Sub Menu
	Menu						Description
		Menu Icon	Item
	Item
			Volume		Adjust volume.
	Audiu
			Balance		Adjust balance.
	Control
			Bass		Adjust bass.
			Treble		Adjust treble.
			Clock		Adjust picture Clock to reduce
					Vertical-Line noise.
			Focus		Adjust Picture Phase to reduce
	Image				Horizontal-Line noise
	Setup
			H.Position		Adjust	the	vertical	position	of		the
					picture.
			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.
	Color		sRGB		Recall SRGB Color Temperature from
					EEPROM.
	Temp.
				User-B	Blue Gain from Digital-register
				User-G	Green Gain Digital-register.
			User	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
	Main	Main	Sub Menu
	Menu			Sub Menu	Description
		Menu Icon	Item
	Item
	Color		Full	on or off	Disable or Enable Full Enhance Mode
			Enhance
	Boost
			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
			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			Adjust Frame Size
					Brightness			Adjust Frame Brightness
					Contrast			Adjust Frame Contrast
	Picture
					Hue			Adjust Frame Hue
	Boost
					Saturation			Adjust Frame Saturation
					Position			Adjust Frame Position
					Bright			Disable or Enable Bright Frame
					Frame
	Main		Main		Sub Menu
	Menu		Menu			Sub Menu		Description
					Item
	Item		Icon
					H.Position		Adjust the vertical position of OSD
	OSD				V.Position		Adjust the horizontal position of OSD
	Setup
					Timeout		Adjust the OSD Timeout
					Language		Select the OSD language
						HDMI	Select HDMI Sigal Source as Input
						Ypbpr	Select Ypbpr Sigal Source as Input
				Input Select
						Digital	Select Digital Sigal Source as Input
						Analog	Select Analog Sigal Source as Input
	Extra
					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		Show the information of the main image and
							sub-image source

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22" LCD Color Monitor

AOC 2212ph

4. Input/Output Specification

4.1 Input Signal Connector

Analog connectors

1	5
6	10
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	15.	Ground(for+5V)
	Shield
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	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	RESOLUTION		HORIZONTAL	VERTICAL
			FREQUENCY	FREQUENCY
		PC MODES
	640x480		31.469kHz	60 Hz
	640x480		37.861kHz	72 Hz
VGA	640x480		37.500kHz	75 Hz
	800x600		35.156kHz	56 Hz
SVGA	800x600		37.879kHz	60 Hz
	800x600		48.077kHz	72 Hz
	800x600		46.875kHz	75 Hz
	1024x768		48.363kHz	60 Hz
XGA	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
SXGA	1280x1024		77.900kHz	72 Hz
	1280x1024		79.976kHz	75 Hz
	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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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

4.3.5Electrical Characteristics

(1)TFT-LCD

(2) Backlight

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22" LCD Color Monitor

5. Block Diagram

5.1 Software Flow Chat

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AOC 2212ph

1

2

N

4

5

Y

6

7

Y

9

10 Y

N12

Y

14

N19 Y

Y 3

N

N 8

N 11

13 N

Y

15 N 16 Y

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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

Bridge

Rectifier

Transformer

EMI filter

Rectifier

diodes

and Filter

CN902

Start Circuit: R904,R932,R933

12V

5V

Feedback

CN902

PWM

Circuit

Control IC

ON/OFF

Output

MOSFET

Circuit

Transformer

Lamp

Feedback

Over

PWM

ON/OFF

Circuit

Voltage

Control

Control IC

DIM

DIM

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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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