AOC 719Pa Service Manual

17" LCD Color Monitor

AOC 719Pa

Service

Service

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

1

17" LCD Color Monitor

AOC 719Pa

Revision List

Version	Release Date	Revision History	TPV Model Name
A00	July.07.2008	Initial release	T78SRHDBK1A1DN

2

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.)

3

17" LCD Color Monitor				AOC 719Pa
1. Monitor Specifications
		Model number		719Pa
		Driving system		TFT Color LCD
		Viewable Image Size		432mm diagoanl
	LCD Panel	Pixel pitch		0.264mm(H) x 0.264mm(V)
		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
		Optimal preset resolution		1280 x 1024 (60 Hz)
		Highest preset resolution		1280 x 1024 (75 Hz)
	Resolution	Plug & Play		VESA DDC2B/CI
		Input Connector		D-Sub 15pin & DVI-D
		Input Video Signal		Analog: 0.7Vp-p(standard), 75 OHM, Positive &
				DVI-D
		Power Source		100~240VAC, 50/60Hz
		Power Consumption		Active < 37 W
				Standby < 2 W
		Speakers		1.5 W x 2
		Connector Type		15-pin Mini D-Sub & 24 pin DVI-D
		Signal Cable Type		Detachable
		Dimensions & Weight
	Physical	Height (with base)		392.5mm/ 498mm
	Characteristics
		Width		371.5 mm
		Depth		250 mm
		Weight (monitor only)		5.65kg
		Weight (with packaging)		7.1 kg
	Environmental	Temperature
		Operating		0° to 40°
		Non-Operating		-20°to 60°
		Humidity
		Operating		10% to 85% (non-condensing)

4

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 )

5

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.

Monitor Block Diagram

CCFL Drive.

Flat Panel and

CCFL backlight

RS232 Connector

Power board

Main Board

For white balance

(Include: adapter, inverter, audio)

adjustment in factory

mode

AC-IN

Key board

Video signal, DDC

100V-240V

HOST Computer

6

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

7

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.

8

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.
			Standard		Standard Mode
			Text		Text Mode
		Eco mode	Internet		Internet Mode
			Game		Game Mode
			Movie		Movie Mode
			Sports
			Gamma1		Adjust to Gamma 1
		Gamma
			Gamma2		Adjust to Gamma 2
			Gamma3		Adjust to Gamma 3
			Off		Disable dynamic contrast ratio
		DCR
			On		Enable dynamic contrast ratio
		Image Setup
		Clock	0-100		Adjust picture Clock to reduce Vertical-Line
					noise.
		Phase	0-100		Adjust Picture Phase to reduce Horizontal-Line
					noise
		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	Recall Normal Color Temperature from
					EEPROM.
		Cool		9300K	Recall Cool Color Temperature from EEPROM.
		sRGB			Recall SRGB Color Temperature from
					EEPROM.
				Red	Red Gain from Digital-register
		User
				Green	Green Gain Digital-register.
				Blue	Blue Gain from Digital-register

9

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	H. position		Adjust Frame horizontal Position
			V.position		Adjust Frame vertical 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			Select the OSD language
		Extra
				Auto	Select to Auto Detect input signal
				Analog	Select Analog Sigal Source as Input
		Input Select
				Digital	Select Digital Sigal Source as Input
				HDMI	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			Show the information of the main image and
					sub-image source
		Reset
		Reset	yes or no		Reset the menu to default
		Exit
		Exit			Exit the main OSD

10

17" LCD Color Monitor

AOC 719Pa

4. Input/Output Specification

4.1 Input Signal Connector

Analog connectors

Pin No.	Description	Pin No.	Description
1.	Video-Red	9.	+5V
2.	Video-Green	10.	Ground
3.	Video-Blue	11.	N.C.
4.	N.C.	12.	DDC-Serial Data
5.	Detect Cable	13.	H-Sync
6.	GND-R	14.	V-Sync
7.	GND-G	15.	DDC-Serial Clock
8.	GND-B

VGA connector layout

DVI connectors

Pin No.	Description		Pin No.	Description	Pin		Description
					No.
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 -

11

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

50 ± 3Hz, 60 ± 3Hz

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

No advance effects (no loss of information or defect)

with a maximum of 1 half-wave missing per second

DC output Voltage

5VDC ± 5 ; 12VDC± 5

Current

1.5Amp (5V) 2 Amp (12V)

4.3 Factory Preset Display Modes

Stand

Resolution

Horizontal

Vertical

Frequency(kHz)

Frequency(Hz)

Dos-mode

720 x 400

31.47

70.0

VGA

640 x 480

31.47

60.0

640 x 480

37.50

75.0

SVGA

800 x 600

37.879

60.0

800 x 600

46.875

75.0

1024 x 768

48.363

60.0

1024 x 768

56.476

70.0

XGA

1024 x 768

60.02

75.0

1024 x 768

48.780

60.0

1024 x 768

60.241

75.0

SXGA

1280 x 1024

64.00

60.0

1280 x 1024

80.00

75.0

12

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

4.4.2Display Characteristics

13

17" LCD Color Monitor

AOC 719Pa

4.4.3Electrical Characteristics

(1)TFT-LCD

(2) Backlight

14

17" LCD Color Monitor

AOC 719Pa

4.4.4 Optical Characteristics

15

17" LCD Color Monitor

5. Block Diagram

5.1 Software Flow Chat

1

2

N

4

5

Y

6

7

Y

9

AOC 719Pa

Y

3

N

N

8

	10	N
		11
	Y
N	12	13	N
	Y	Y
	14	15	N
			16
		Y
		17

N

18 19

Y

16

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?

17

17" LCD Color Monitor	AOC 719Pa
5.2 Electrical Block Diagram
5.2.1 Main Board

Crystal 24MHz

(X401)

EPR_SDA

MCU

EEPROM EPR_SCL CRYSTAR_OUT

RTD2120L-LF

AF24BC16-SI (U403)

(U401) RTD_SCLK RTD_SD3/SDI

DDC1_SCL

DDC1_SDA

Key Board Control

(CN202)

DDC2_SCL

DDC2_SDA

LCD Interface

(CN601)

Scalar IC RTD2525LH-GR

(Include ADC, OSD)

(U501)

H sync			D-Data
V sync
			D-Clock
RGB
D-Sub		DVI
Connector		Connector
(CN301)		(CN302)

18