AOC 719Pa Service Manual

17" LCD Color Monitor AOC 719Pa

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…………………………….......6

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

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

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

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

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

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

4.2. Power Supply Requirements...............................12

4.3. Factory Preset Display Modes…….........................12

4.4. Panel Specification.....………...………..................13

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

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

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

6. Schematic……………......................................20

6.1. Main Board………..........................................20

6.2. Power Board...……....................................25

6.3. Key Board...……......................................28

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

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

7.2. Power Board….......................................31

7.3. Key Board……………....................................34

8. Maintainability……….......................................35

8.1. Equipments and Tools Requirement..............35

8.2. Trouble Shooting………..............................36

9. White-Balance, Luminance adjustment............42

10. Monitor Exploded View……..…….…............44

11. BOM List………………………………............45

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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17" LCD Color Monitor AOC 719Pa

Revision List

Version Release Date Revision History TPV Model Name

A00 July.07.2008 Initial release T78SRHDBK1A1DN

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17" LCD Color Monitor AOC 719Pa

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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17" LCD Color Monitor AOC 719Pa

1. Monitor Specifications

Model number 719Pa

Driving system TFT Color LCD

Viewable Image Size 432mm diagoanl

Pixel pitch 0.264mm(H) x 0.264mm(V)

LCD Panel

Video R, G, B Analog lnterface & Digital Interface

Separate Sync. H/V TTL

Display Color 16.7M Colors

Dot Clock 54 MHz

Horizontal scan range 31 kHz - 80 kHz

Horizontal scan Size(Maximum) 337.920mm

Vertical scan range 56 Hz - 75 Hz

Vertical scan Size(Maximum) 270.336mm

Resolution

Physical

Characteristics

Optimal preset resolution 1280 x 1024 (60 Hz)

Highest preset resolution 1280 x 1024 (75 Hz)

Plug & Play VESA DDC2B/CI

Input Connector D-Sub 15pin & DVI-D

Input Video Signal

Power Source 100~240VAC, 50/60Hz

Power Consumption

Speakers 1.5 W x 2

Connector Type 15-pin Mini D-Sub & 24 pin DVI-D

Signal Cable Type Detachable

Dimensions & Weight

Height (with base)

Width

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

DVI-D

Active < 37 W

Standby < 2 W

392.5mm/ 498mm

371.5 mm

Environmental

Depth

Weight (monitor only)

Weight (with packaging)

Temperature

Operating 0° to 40°

Non-Operating -20°to 60°

Humidity

Operating 10% to 85% (non-condensing)

250 mm

5.65kg

7.1 kg

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17" LCD Color Monitor AOC 719Pa

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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17" LCD Color Monitor AOC 719Pa

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.

(Include: adapter, inverter, audio)

Power board

AC-IN

100V-240V

Monitor Block 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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17" LCD Color Monitor AOC 719Pa

3. Operating 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

1. Source (Auto) / Exit

2 Eco mode / -

3.Volume / +

4. Menu / Enter

5. Power Button

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17" LCD Color Monitor AOC 719Pa

3.3 OSD Menu

OSD Settings

•

Press the MENU-button to activate the OSD window.

• Press+ or - to navigate through the functions. Once the desired function is highlighted, press the MENU-buttonto

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.

• Press+ or - to change the settings of the selected function. To exit and save, select the exit function. If you want to

adjust any other function, repeat steps 2-3.

• 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.

• Eco Mode hot key: Press the Eco key continuously to select the Eco mode of brightness when there is no OSD ( Eco

mode hot key may not be available in all models).

• Volume adjustment hot key: When there is no OSD, press Volume (+) to active volume adjustment bar, press - or + to

adjust volume (Only for the models with speakers).

• 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/Enter 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.

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17" LCD Color Monitor AOC 719Pa

Function Control Illustration

Luminance Adjust Range Description

Brightness 0-100 Backlight Adjustment

Contrast 0-100 Contrast from Digital-register.

Eco mode

Gamma

DCR

Standard

Te xt

Internet

Game

Movie

Sports

Gamma1 Adjust to Gamma 1

Gamma2 Adjust to Gamma 2

Gamma3 Adjust to Gamma 3

Off

Standard Mode

Text Mode

Internet Mode

Game Mode

Movie Mode

Disable dynamic contrast ratio

Enable dynamic contrast ratio

On

Image Setup

Clock 0-100

Phase 0-100

H.Position 0-100 Adjust the verticalposition of the picture.

V.Position 0-100 Adjust the horizontal position of the picture.

Color Temp.

Warm 6500K Recall Warm Color Temperature from EEPROM.

Normal 7300K

Cool 9300K Recall Cool Color Temperature from EEPROM.

sRGB

Red Red Gain from Digital-register

Adjust picture Clock to reduce Vertical-Line

noise.

Adjust Picture Phase to reduce Horizontal-Line

noise

Recall Normal Color Temperature from

EEPROM.

Recall SRGB Color Temperature from

EEPROM.

User

Green Green Gain Digital-register.

Blue Blue Gain from Digital-register

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17" LCD Color Monitor AOC 719Pa

Color Boost

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

AutoDetect on or off Disable or Enable AutoDetect Mode

Demo on or off Disable or Enable Demo

Picture Boost

Frame Size 14-100 Adjust Frame Size

Brightness 0-100 Adjust Frame Brightness

Contrast 0-100 Adjust Frame Contrast

Position

Bright Frame on or off Disable or Enable Bright Frame

OSD Setup

.Position 0-100 Adjust the horizontal position of OSD

V.Position 0-100 Adjust the vertical position of OSD

Timeout 5-120 Adjust the OSD Timeout

Transparence 0-100 Adjust the transparence of OSD

Language

Extra

Input Select

H. position Adjust Frame horizontal Position

V.position Adjust Frame vertical Position

Auto Select to Auto Detect input signal

Analog Select Analog Sigal Source as Input

Digital Select Digital Sigal Source as Input

HDMI

Select the OSD language

Select HDMI sigal source as input (Only for the

models with HDMI input)

Auto Config yes or no Auto adjust the picture to default

Image Ratio wide or 4:3 Select wide or 4:3 format for display

DDC-CI yes or no Turn ON/OFF DDC-CI Support

Information

Reset

Reset yes or no Reset the menu to default

Exit

Exit Exit the main OSD

Show the information of the main image and

sub-image source

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17" LCD Color Monitor AOC 719Pa

4. Input/Output Specification

4.1 Input Signal Connector

Analog connectors

Pin No. Description Pin No. Description

1.

2. Video-Green 10. Ground

3. Video-Blue 11. N.C.

4. N.C. 12. DDC-Serial Data

5.

6. GND-R 14. V-Sync

7. GND-G 15. DDC-Serial Clock

8. GND-B

Video-Red

Detect Cable

9.

13.

VGA connector layout

+5V

H-Sync

DVI connectors

Pin No. Description Pin No. Description

1 TMDS Data 2- 9 TMDS Data 1- 17 TMDS Data 0-

2 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 5-

5 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 -

Description

No.

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17" LCD Color Monitor AOC 719Pa

4.2 Power Supply Requirements

A/C Line voltage range 100 V ~ 240 V

A/C Line frequency range

Current 1.5A max at 100V ; 0.8A max at 240 V

Peak surge current < 55A peak at 240 VAC and cold starting

Leakage current < 3.5mA

Power line surge

DC output Voltage

Current

4.3 Factory Preset Display Modes

Stand Resolution

Dos-mode 720 x 400 31.47 70.0

640 x 480 31.47 60.0

VGA

640 x 480 37.50 75.0

800 x 600 37.879 60.0

SVGA

800 x 600 46.875 75.0

50 ± 3Hz, 60 ± 3Hz

No advance effects (no loss of information or defect)

with a maximum of 1 half-wave missing per second

5VDC ± 5％; 12VDC± 5％

1.5Amp (5V) ；2 Amp (12V)

Horizontal

Frequency(kHz)

Vertical

Frequency(Hz)

XGA

SXGA

1024 x 768 48.363 60.0

1024 x 768 56.476 70.0

1024 x 768 60.02 75.0

1024 x 768 48.780 60.0

1024 x 768 60.241 75.0

1280 x 1024 64.00 60.0

1280 x 1024 80.00 75.0

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17" LCD Color Monitor AOC 719Pa

4.4 Panel Specification

4.4.1 General Features

LTM170EU-L31 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film

Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back

light unit. The resolution of a 17.0“ is 1280x 1024 and this model can display up to 16.7 millions colors.

 RoHS compliance (Pb-free)

 High contrast ratio, high aperture ratio, fast response time

 TN(Twisted Nematic) mode

 2 dual CCFTs(Cold Cathode Fluorescent Tube)

 DE(Data Enable) mode

 LVDS (Low Voltage Differential Signaling) interface (2pixel/clock)

 COMPACT SIZE DESIGN

 TCO’03 compliance

4.4.2 Display Characteristics

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17" LCD Color Monitor AOC 719Pa

4.4.3 Electrical Characteristics

(1) TFT-LCD

(2) Backlight

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17" LCD Color Monitor AOC 719Pa

4.4.4 Optical Characteristics

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17" LCD Color Monitor AOC 719Pa

5. Block Diagram

5.1 Software Flow Chat

1

2

N

4

5

Y

6

7

Y

3

N

18

9

10

Y

N

12

Y

14

19

N

15

11

13

17

N

Y

N

16

Y

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17" LCD Color Monitor AOC 719Pa

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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17" LCD Color Monitor AOC 719Pa

5.2 Electrical Block Diagram

5.2.1 Main Board

EEPROM

AF24BC16-SI (U403)

Key Board Control

EPR_SDA

EPR_SCL

(CN202)

Crystal

24MHz

(X401)

MCU

RTD2120L-LF

(U401)

CRYSTAR_OUT

RTD_SCLK

RTD_SD3/SDI

DDC1_SCL

DDC1_SDA

DDC2_SCL

LCD Interface

(CN601)

Scalar IC RTD2525LH-GR

(Include ADC, OSD)

(U501)

H sync

V sync

RGB

D-Sub

Connector

(CN301)

Connector

(CN302)

D-Data

D-Clock

DVI

DDC2_SDA

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