AOC 2230FH Schematic

22" LCD Color Monitor AOC 2230FH

Service

Service

Service

Horizontal Frequency
31-83 kHz

TABLE OF CONTENTS

Description Page Description Page

Table Of Contents…………………………………………...1
Important Parts List…………………………………………2

Revision List………………………………………………....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...........................…..............8

4. Input/Output Specification............……………............12

4.1. Input Signal Connector............………….................12

4.2. Factory Preset Display Modes...........…..................13

4.3. Panel Specification.....………..…………..................14

5. Block Diagram….........................................................16

5.1 Software Flow Chart………………………….……….16

5.2.Electrical Block Diagram…..……………………........18

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS

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

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

6.2 Power Board………………………………………....26

6.3 Key Board…………………………………...………….29

7. PCB Layout..…………................................................30

7.1. Main Board……….............................................. .....30

7.2. Power Board…............................................... .........33

7.3. Key Board…............................................. ...............36

8.Maintainability………......................................... ......37

8.1.Equipments and Tools Requirement.........................37

8.2.Trouble Shooting………............................................38

9. White-Balance, Luminance adjustment…...……..…...44

10. Monitor Exploded View……………………….…........46

1 1. BOM List…................................................................47

12. Different Parts List……………………………………..60

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 2230FH

Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The servi ce
procedures recommended by AOC and described in this service manual are effective methods of performin g 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 CAUTIO NS 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 mu st 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 safet y characteristics might 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 radiations 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 ground ed 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 2230FH

Revision List

Version Date Revision History TPV Model Name

A00 Jun.-3-2008 Initial release TC8MM8NKWCA1DN
A01 Jul.-6-2008 Add new BOM TC8MM8NQWCA15N

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22" LCD Color Monitor AOC 2230FH

1. Monitor Specification

Model number 2230Fh
Driving system TFT Color LCD
Viewable Image Size 558mm diagoanl

LCD Panel

Resolution

Pixel pitch 0.282mm(H) x 0.282mm(V)
Video R, G, B Analog lnterface & Digital Interface, HDMI
Separate Sync. H/V TTL
Display Color 16.7M Colors
Dot Clock 165 MHz
Horizontal scan range 31 kHz - 83 kHz

Horizontal scan
Size(Maximum)

Vertical scan range 56 Hz - 76 Hz
Vertical scan Size(Maximum) 296.1mm
Optimal preset resolution 1680 x 1050 (60 Hz)
Highest preset resolution 1680 x 1050 (60 Hz)
Plug & Play VESA DDC2B/CI
Input Connector D-Sub & DVI-D,HDMI

Input Video Signal
Power Source 100~240VAC, 50/60Hz

473.76mm

Analog: 0.7Vp-p(standard), 75 OHM, Positive &
DVI-D,HDMI

Physical

Characteristics

Environmental

Power Consumption

Speakers 2 x 2W
Connector Type 15-pin Mini D-Sub & 24 pin DVI-D, 19 pin HDMI
Signal Cable Type Detachable
Dimensions & Weight:
Height (with base)
Width
Depth
Weight (monitor only)
Weight (with packaging)
Temperature:
Operating 0° to 40°
Non-Operating -20°to 60°
Humidity:
Operating 10% to 85% (non-condensing)

Active < 49 W
Standby < 2 W

416.8 mm

510.2 mm

219.6 mm

5.2kg

6.7 kg

Non-Operating 5% to 80% (non-condensing)
Altitude:
Operating 0~ 3000m (0~ 10000 ft )
Non-Operating 0~ 5000m (0~ 15000 ft )

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22" LCD Color Monitor AOC 2230FH

2. LCD Monitor Description

The LCD Monitor will contain main board, power board, 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

CCFT Drive.

Flat Panel and
CCFL backlight

(Include adapter and inverter)

Power Board

Main Board

RS232 Connector
For white balance
adjustment in
factory mode

Key board

AC-IN
100V~240V

HOST Computer

Video signal, DDC

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22" LCD Color Monitor AOC 2230FH

3. Operation Instructions

3.1 General Instructions

Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor
(See Figure ). By changing these settings, the picture can be adjusted to your personal preferences.
* The power cord should be connected.
* Press the power button to turn on the monitor. The power indicator will light up.

3.2 Control Buttons

3.2.1 External Controls

1 Eco mode / Up 4 DCR / Right
2 Source(Auto) / Exit 5 Menu / Power
3 Volume /Left

3.2.2 Attaching the Cables

1. Power 4. Analog

2. HDMI 5. Audio

3. DVI 6. Earphone
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22" LCD Color Monitor AOC 2230FH

3.2.3 Attaching Wall Mounting Arm

Preparing to Install An Optional Wall Mounting Arm

This monitor can be attached to a wall mounting arm you purchase separately. Disconnect p ower before this
procedure. Follow these steps:

1. Remove the base.

2. Follow the manufacturer's instructions to assemble the wall mounting arm.

3. Place the wall mounting arm onto the back of the monitor. Line up the holes of the arm with the holes in the
back of the monitor.

4. Insert the 4 screws into the holes and tighten.

5. Reconnect the cables. Refer to the user's manual that came with the optional wall mounting arm for
instructions on attaching it to the wall.

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22" LCD Color Monitor AOC 2230FH

3.3 Adjust the Picture

OSD Settings

• Press the Menu (Power) button to activate the OSD window. Press left, right, up, down button to navigate
through the functions. Once the desired function is highlighted, press the Menu (Power) button to activate
sub-menu .

• In sub-menu, Press up, down button to navigate through the functions. Once the desired function is
highlighted, press
superior menu.

• If you want to adjust any other function, repeat steps 1-2.

• To exit OSD windows, select “exit” icon on main OSD, then press the Menu (Power) button .

• OSD Lock Function: To lock the OSD, press and hold the Left 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 Left button while t he monitor is
off and then press power button to turn the monitor on.

• Eco Mode hot key (
no OSD ( Eco mode hot key may not be available in all models).

• Volume adjustment hot key : When there is no OSD , press Volume (
press or to adjust volume ( Only for the models with speakers).

• DCR hot key (

• Source hot key : When the OSD is closed, press Auto/Source button will be Source hot key function (Only

for the models with dual or more inputs) .Press Source button continuously to select the input source
showed in the message bar , press Menu button to change to the source selected.

• Auto configure hot key: When the OSD is closed, press Auto/Source button continuously about 2 second to
do auto configure.

• Press the Power button continuously about 2 second to turn off the monitor.

, button to button to change the setting. Press Menu (Power) button to return to

) : Press the Eco key continuously to select the Eco mode of brightness when there is

) to active volume adjustment bar,

) : Press DCR key continuously to active or disable DCR function when there is no OSD.

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22" LCD Color Monitor AOC 2230FH

Full Enhance: When "Full Enhance" is turned on, the color saturation of the entire screen is fully enriched, thus all

colors become more vibrant.

Nature Skin: When "Natural Skin" is turned on, the red and yellow colors are enriched automatically, thus presents

human skin with more natural and truer colors. "Natural Skin" setting is ideal for viewing human
portrait and detailed skin texture.

Green Field: When "Green Field" is turned on, the green color is enriched so that football field and mountain

landscape would look more natural and fresh. “Green Field” setting is ideal for watching mountain
scenery and outdoor sports.

Sky Blue: When"Sky Blue" is turned on, the color blue is being fine-tuned so that the sky or ocean landscape will

look more vivid and in-depth. "Sky Blue" setting is ideal for viewing sky and ocean images.

Auto Detect: When “Auto Detect” is turned on, every pigment will be detected and self-adjusted to render a lively

picture.

Demo: Screen divided into two for demonstration purposes.

Function Control Illustration

Luminance Adjust Range Description
Brightness 0-100 Backlight Adjustment
Contrast 0-100 Contrast from Digital-register.
Eco mode

Standard

Standard Mode

Text

Internet

Game Mode

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Text Mode

Internet Mode

22" LCD Color Monitor AOC 2230FH

Game

Movie

Sports

Gamma

DCR

Image Setup
Clock 0-100

Phase 0-100

H.Position 0-100

V.Position 0-100
Color Temp.
Warm

Normal

Cool

sRGB

User

Color Boost
Full Enhance on or off

Nature Skin on or off

Green Field on or off
Sky-blue on or off Disable or Enable Sky-blue Mode
AutoDetect on or off
Demo on or off Disable or Enable Demo

Picture Boost
Frame Size 14-100 Adjust Frame Size
Brightness 0-100 Adjust Frame Brightness

Gamma1 Adjust to Gamma1
Gamma2 Adjust to Gamma 2
Gamma3 Adjust to Gamma 3

Off

On

6500K

7300K

9300K

Red Red Gain from Digital-register
Green Green Gain Digital-register.
Blue Blue Gain from Digital-register

Movie Mode

Sports Mode

Disable dynamic contrast ratio

Enable dynamic contrast ratio

Adjust picture Clock to reduce
Vertical-Line noise.

Adjust Picture Phase to reduce
Horizontal-Line noise

Adjust the verticalposition of the
picture.

Adjust the horizontal position of
the picture.

Recall Warm Color Temperature
from EEPROM.

Recall Normal Color
Temperature from EEPROM.

Recall Cool Color Temperature
from EEPROM.

Recall SRGB Color Temperature
from EEPROM.

Disable or Enable Full Enhance
Mode

Disable or Enable Nature Skin
Mode

Disable or Enable Green Field
Mode

Disable or Enable AutoDetect
Mode

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22" LCD Color Monitor AOC 2230FH

Contrast 0-100 Adjust Frame Contrast
Hue 0-100 Adjust Frame Hue
Saturation 0-100 Adjust Frame Saturation

Position
Bright Frame on or off Disable or Enable Bright Frame

OSD Setup
H.Position 0-100 Adjust the verticalposition of OSD

V.Position 0-100
Timeout 5-120 Adjust the OSD Timeout

Transparence 0-100 Adjust the transparence of OSD
Language

Extra

Input Select

Auto Config yes or no Auto adjust the picture to default
Image Ratio wide or 4:3

DDC-CI yes or no Turn ON/OFF DDC-CI Sup port
Information

Reset

H. position Adjust Frame horizontal Position
V.position Adjust Frame vertical Position

Adjust the horizontal position of
OSD

Auto Select to Auto Detect input signal
Analog

Digital

Select the OSD language

Select Analog Sigal Source as
Input

Select Digital Sigal Source as
Input

Select wide or 4:3 format for
display

Show the information of the main
image and sub-image source

Reset yes or no Reset the menu to default
Exit

Exit Exit the main OSD

Notes:

1) If the product has only one signal input, the item of "Input Select" is disable to adjust.

2) If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disalbe to
adjust.

3) One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.

LED Indicators

Status LED Color

Full Power Mode Green or Blue
Active-off Mode Orange or red

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22" LCD Color Monitor AOC 2230FH

4. Input/Output Specification

4.1 Input Signal Connector

D-Sub mini 15pin Connector

Pin Number 15-Pin Side of the Signal Cable

1 Video-Red
2 Video-Green
3 Video-Blue
4 N.C.
5 Ground
6 GND-R
7 GND-G
8 GND-B

9 +5V
10
11 N.C.
12 DDC-Serial data
13 H-sync
14 V-sync
15 DDC-Serial clock

DVI-D 24pin Connector

Ground

Pin No. Signal Name Pin No. Signal Name Pin No. Signal Name

1 TMDS Data 2- 9 TMDS Data 1- 17 TMDS Data 0­2 TMDS Data 2+ 10 TMDS Data 1+ 18 TMDS Data 0+
3 TMDS Data 2/4 Shield 11 TMDS Data 1/3 Shield 19 TMDS Data 0/5 Shield
4 TMDS Data 4- 12 TMDS Data 3- 20 TMDS Data 5­5 TMDS Data 4+ 13 TMDS Data 3+ 21 TMDS Data 5+
6 DDC Clock 14 +5V Power 22 TMDS Clock Shield
7 DDC Data 15 Ground(for+5V) 23 TMDS Clock +
8 N.C. 16 Hot Plug Detect 24 TMDS Clock -

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22" LCD Color Monitor AOC 2230FH

4.2 Factory Preset Display Modes

Horizontal

Stand Resolution

Frequency(Khz)

VGA 640×480 @60Hz 31.469 59.940
VGA 640×480 @72Hz 37.861 72.809

VGA 640×480 @75Hz 37.500 75.000
Dos-mode 720×400 @70Hz 31.469 70.087
Dos-mode 640×400 @71Hz 31.469 70.087

SVGA 800×600 @56Hz 35.156 56.250
SVGA 800×600 @60Hz 37.879 60.317
SVGA 848x480@60Hz 31.020 60.000
SVGA 800×600 @72Hz 48.077 72.188
SVGA 800×600 @75Hz 46.875 75.000

Vertical

Frequency(Hz)

XGA 1024×768 @60Hz 48.363 60.004

XGA 1024×768 @70Hz 56.476 70.069

XGA 1024×768 @75Hz 60.023 75.029

XGA 1024×768 @75Hz 60.241 74.927

XGA 1280×768 @60Hz 47.776 59.870

XGA 1280×768 @60Hz 47.396 59.995

XGA 1280×768 @75Hz 60.289 74.893

SXGA 1280×1024 @60Hz 63.981 60.020
SXGA 1280×1024 @70Hz 74.882 69.853
SXGA 1360x768@60Hz 47.712 60.015

WSXGA 1680×1050 @60Hz 65.290 59.954

WSXGA+ 1680x1050@60Hz 65.290 59.954

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22" LCD Color Monitor AOC 2230FH

4.3. Panel Specification

4.4.1 General Features

4.4.2 Display Characteristics

4.4.3 Electrical Characteristics
TFT LCD Module

Backlight Unit

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22" LCD Color Monitor AOC 2230FH

4.4.4 Optical Characteristics

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22" LCD Color Monitor AOC 2230FH

5. Block Diagram

5.1 Software Flow Chart

N

10

12

14

1

Y

2

N

4

5

Y

6

7

9

Y

N

N

Y

N

Y

11

13

15

3

8

N

Y

N

16

Y

18

17

N

19

Y

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22" LCD Color Monitor AOC 2230FH

REMARK:

1) MCU initialize.

2) Is the EEprom blank?

3) Program the EEprom by default values.

4) Get the PWM value of brightness from EEprom.

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 EEprom.
Turn on the LED and set it to green color.
Scalar initialize.

10) In standby mode?

11) Update the lifetime of back light.

12) Check the analog port, are they’re 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 2230FH

5.2 Electrical Block Diagram

Main Board

Panel interface

D-SUB Input

DVI Input

HDMI Input

Scalar

TSUMO58GDJ-LF

(U401)

Power

Audio

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