AOC AH191D Schematic

19" LCD Color Monitor I-INC AH191D

Service

Horizontal Frequency

31-80 kHz

TABLE OF CONTENTS

Description Page Description Page

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

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

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

1. Monitor Specification.................................………........4

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

3. Operation Instruction………….........……………...........7

3.1 General Instructions.....................................…...........7

3.2 Control Button…………………………………………...7

3.3 Adjusting the Picture...........................…............9

4. Input/Output Specification............……………............14

4.1 Input Signal Connector............………….................14

4.2 Factory Preset Display Modes..................................15

4.3 Panel Specification.....………………........................16

5.Block Diagram…….…................……..…..............19

5.1Software Flow Chart…………………...............19

5.2 Electrical Block Diagram………....………..………....21

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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SAFETY NOTICE

6. Schematic…………………….…..............................23

6.1 Main Board…………..............................................23

6.2 Power Board....……………....................................28

6.3 Key Board ……………………………..…………….30

6.4 Audio Board....……...............................................31

7. PCB Layout..………….......................................32

7.1. Main Board………........................................32

7.2 Power Board….......................................34

7.3 Audio Board....…….......................................36

7.4 Keypad 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……..………………............45

11. BOM List....…….....................................................46

19" LCD Color Monitor I-INC AH191D

Revision List

Revision Date Revision History TPV Model

A00 Nov-02-2006 Initial release T96HM6DTWEHZAE

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19" LCD Color Monitor I-INC AH191D

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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19" LCD Color Monitor I-INC AH191D

1. Monitor Specifications

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19" LCD Color Monitor I-INC AH191D

2. LCD Monitor Description

The LCD MONITOR will contain a main board, a power board, an audio 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)

CCFL Drive.

Monitor Block Diagram

Flat Panel and CCFL backlight

Main board

Audio board

Key board

RS232 Connector

For white balance

adjustment in factory

mode

Video signal, DDC

AC-IN 100V-240V

HOST Computer

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19" LCD Color Monitor I-INC AH191D

Dimensions

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19" LCD Color Monitor I-INC AH191D

3. Operating Instructions

3.1 General Instructions

Press the power button to turn the monitor on or off. The control buttons are located in the front 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

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19" LCD Color Monitor I-INC AH191D

FRONT PANEL CONTROL

• Power Button:

Press this button to switch ON/OFF of monitor’s power.

• Power Indicator:

Green — Power On mode.

Orange — Off mode.

• MENU / ENTER:

1. Activate the OSD menu or adjust the function settings and confirmation or

2. Exit OSD menu when in volume OSD status.

• Volume < >:

1. Activates the volume control when the OSD is OFF.

2. Navigate through adjustment icons when OSD is ON or adjust a function when function is activated.

• Auto Adjust button:

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 H-Position, V-Position, Clock and Focus.)

NOTES:

• Do not install the monitor in a location near heat sources such as radiators or air dusts, or in a place subject to direct

sunlight, or excessive dust or mechanical vibration or shock.

• Save the original shipping box 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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19" LCD Color Monitor I-INC AH191D

3.3 Adjusting the Picture

Adjustment steps:

1. Press the MENU-button to activate the OSD window.

2. Press < or > to select the desired function.

3. Press the MENU-button to select the function that you want to adjust.

4. Press < or > to change the settings of the current function.

5. To exit and save, select the exit function, or leave the monitor alone for 10 seconds. If you want to adjust any other function, repeat steps 2-4.

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19" LCD Color Monitor I-INC AH191D

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19" LCD Color Monitor I-INC AH191D

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19" LCD Color Monitor I-INC AH191D

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19" LCD Color Monitor I-INC AH191D

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19" LCD Color Monitor I-INC AH191D

4. Input/Output Specification

4.1 Input Signal Connector

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19" LCD Color Monitor I-INC AH191D

4.2 Factory Preset Display Modes

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19" LCD Color Monitor I-INC AH191D

4.4 Panel Specification

HannStar Display model HSD190MGW1-A00 is a color active matrix thin film transistor (TFT) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. This model is composed of a TFT LCD panel, the voltage reference, common voltage, DC-DC converter, column, and row driver circuit. This TFT LCD has a 19-inch diagonally measured active display area with WXGA+ resolution (900 vertical by 1440 horizontal pixel array).

4.4.1 Display Characteristics

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19" LCD Color Monitor I-INC AH191D

4.4.2 Optical Characteristics

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19" LCD Color Monitor I-INC AH191D

4.4.3 Parameter guide line for CCFL Inverter

TFT LCD Module:

Back Light Unit:

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