Envision H976WDL Service Manual

18" LCD Monitor Envision H976WDL

1

Service

Service

Service

Horizontal Frequency

30- 83kHz

Table of Contents

Description Page Description Page

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.

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

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

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

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

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

3.Operation Instruction.…………...................……...........6

3.1.General Instructions....................................…...........6

3.2.Control Buttons and Connections...............................6

3.3.OSD Menu…..............................................................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.Main Board…..….............................................16

5.2.Power Board…………..…………………………......17

6.Schematic…………..….........................................18

6.1.Main Board..…….…...........................................18

6.2.Power Board..……….........................................22

6.3.Key Board…............……....................................24

7.PCB Layout..………..............................................25

7.1.Main Board………..…........................................25

7.2.Power Board….…..............................................29

7.3.Key Board………..…..........................................33

8.Maintainability………............................................34

8.1.Equipments and Tools Requirement…...............34

8.2.Trouble Shooting…..………...............................35

9.White-Balance,Luminance Adjustment…..............39

10.Monitor Exploded View……................................40

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

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

2

Revision List

Version Release Date Revision History TPV Model Name

A01 May.21.2012 Initial release T8B2HG2TAJE1HN

3

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.)

4

1. Monitor Specifications

LCD Panel

Model number H976WDL

Driving system TFT Color LCD

Viewable Image Size 47 cm diagoanl

Pixel pitch 0.3mm(H) x 0.3mm(V)

Video R, G, B Analog lnterface

Separate Sync. H/V TTL

Display Color 16.7M Colors

Dot Clock 90MHz

Resolution

Horizontal scan range 30kHz - 83kHz

Horizontal scan
Size(Maximum)

409.8mm

Vertical scan range 55 Hz – 75 Hz

Vertical scan
Size(Maximum)

230.4mm

Optimal preset resolution 1366 x 768(60Hz)

Highest preset resolution 1366 x 768(60Hz)

Plug & Play VESA DDC2B/CI

Input Connector D-Sub15pin & DVI-D

Input Video Signal Analog: 0.7Vp-p(standard), 75 OHM

Power Source 100-240V~, 50/60Hz

Power Consumption

Active < 25 W

Standby < 0.5W

Physical

Characteristics

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

Signal Cable Type Detachable

Dimensions & Weight:

Height (with base) 331.9mm

Width 444.8mm

Depth 197.6 mm

Weight (monitor only) 2.68kg

Environmental

Temperature:

Operating 0°Cto 40° C

Non-Operating -25°Cto 55°C

Humidity:

Operating 10% to 85% (non-condensing)

Non-Operating 5% to 93% (non-condensing)

Altitude:

Operating 0~ 3,658m (0~ 12,000 ft )

Non-Operating 0~ 12,192m (0~ 40,000 ft )

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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 part will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.

AC-IN

100V-240V

Monitor Block Diagram

Power board

(Adapter/ Converter)

Flat Panel and
LED backlight

Main Board

RS232 Connector
For white balance
adjustment in factory
mode

LED Drive.

Video signal, DDC

HOST Computer

Key Board

6

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.

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 and Connections

Power:

Press the Power button to turn 0n/off the monitor.

Eco Mode / -

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).

4:3 or wide image ratio hot key:

When there is no OSD, press + key to change 4:3 or wide image ratio. (If the product screen size is 4:3 or input
signal resolution is wide format, the hot key is disable to adjust.)

Auto / Exit:

When the OSD is closed, press Auto button will be auto configure hot key function .

Source hot key:

When the OSD is closed, press Source button will be Source hot key function. Press Source button continuously to
select the input source showed in the message bar , press Menu/Enter button to change to the source selected.

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Connecting the Monitor

Cable Connections On Back of Monitor and Computer:

1. Power

2. DVI

3. D-SUB

To protect equipment, always turn off the PC and LCD monitor before connecting.

1. Connect the power cable to the AC port on the back of the monitor.

2. Connect one end of the 15-pin D-Sub cable to the back of the monitor and connect the other end to the
computer's D-Sub port.

3. (Optional – Requires a video card with DVI port) - Connect one end of the 24-pin DVI cable to the back of the
monitor and connect the other end to the computer’s DVI port.

4. Turn on your monitor and computer.

If your monitor displays an image, installation is complete. If it does not display an image, please refer
troubleshooting.

8

3.3 OSD Menu

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

2) Press - or + to navigate through the functions. Once the desired function is highlighted, press the MENU-button to
activate sub-menu . Once the desired function is highlighted, press MENU-button to activate it.

3) Press - or + to change the settings of the selected function. Press - or + to select another function in sub-menu.
Press AUTO to exit . If you want to adjust any other function, repeat steps 2-3.

4) 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:

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 disable to
adjust.

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

9

Function Control Illustration

10

11

12

4. Input/Output Specification

4.1 Input Signal Connector

Analog connectors

Pin Number 15-Pin Side of the Signal Cable

1 Video-Red

2 Video-Green

3 Video-Blue

4 Ground

5 Detect Cable

6 GND-R

7 GND-G

8 GND-B

9 +5V

10 Ground

11 Ground

12 DDC-Serial data

13 H-sync

14 V-sync

15 DDC-Serial clock

DVI connectors

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

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 -

13

4.2 Factory Preset Display Modes

Standard Resolution H. Frequency(kHz) V. Frequency(Hz)

VGA

640×480 @60Hz 31.469 59.94

640×480 @67Hz 35 66.667

640×480 @72Hz 37.861 72.809

640×480 @75Hz 37.5 75

Dos-mode 720×400 @70Hz 31.469 70.087

SVGA

800×600 @56Hz 35.156 56.25

800×600 @60Hz 37.879 60.317

800×600 @72Hz 48.077 72.188

800×600 @75Hz 46.875 75

Mac-mode 832×624 @75Hz 49.725 74.5

XGA

1024×768 @70Hz

56.476 70.069

1024×768 @72Hz 57.5 72.074

1024×768 @75Hz 60.023 75.029

1024×768 @60Hz 48.363 60.004

WXGA

1280×720 @60Hz 45 60

1360×768 @60Hz 47.712 60.015

1366×768 @60Hz 47.765 59.85

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4.3 Panel Specification

4.3.1 General Features

M185BGE-L22 is a 18.5” TFT Liquid Crystal Display module with WLED Backlight unit and 30 pins 1ch-LVDS
interface. This module supports 1366 x 768 HD mode and can display up to 16.7M colors. The converter module for
Backlight is not built in..

4.3.2 Display Characteristics

Item Specification Unit

Screen Size 18.51” real diagonal

Driver Element a-si TFT active matrix - -

Pixel Number 1366x R.G.B. x 768pixel Pixel

Pixel Pitch 0.3(H) x 0.3(V) mm Mm

Pixel Arrangement RGB vertical stripe - -

Display Colors 16.7M color Color

Tran missiveMode Normallywhite -

Surface Treatment AG type, 3H hard coating, Haze 25%- -

Luminance, White 250 Cd/m2 Cd/m2

Color Gamut 72% of NTSC(Typ.) -

TCO TCO 5.0 compliance -

Power Consumption

Total (19.35)W(Max.)@cell 3.3 W (Max.),

BL (13)W (Max.)

-

4.3.3 Electrical Characteristics

Parameter

Symbol

Value

Unit

Min. Typ. Max.

Power Supply Voltage Vcc 4.5 5 5.5 V

Ripple Voltage Vrp - - 300 mV

Rush Current Irush 1.5 2 A

Power Supply Current—White

0.3 0.4 A

Power Supply Current--Black 0.5 0.6 A

Power Supply Current--Vertical
Stripe

0.5 0.6 A

Power Consumption PLCD 2.5 3.3 Watt

LVDS differential input voltage VID 100 - 600 mV

LVDS common input voltage VIC 1.0 1.2 1.4 V

Logic High Input Voltage VIH 0.1 V

Logic Low Input Voltage VIL 0.1 V

15

4.3.4 Backlight Unit

Parameter Symbol

Value

Unit

Min Typ. Max.

Light Bar Input Voltage V

LED

29.3 35.2 41 VDC

Light Bar Input Current ILE 240 252 mA

DC

Power Consumption P

LED

8.4 W

LED Lif
Time

L

BL

30000 Hrs

IFP LED Peak forward current I

LED

400 mA

DC

4.3.5 Optical Characteristics

Item Symbol Condition Min. Typ. Max. Unit

Color

Chromaticity

(CIE 1931)

Red

Rx

θx=0°,θY=0°
R=G=B=255

Grayscale

Typ –

0.03

0.641

Typ +

0.03

Ry 0.338

Green

Gx 0.315
Ry 0.612

Blue

Bx 0.159
By 0.059

White

Wx 0.313
Wy 0.329

Center Luminance of

White(Center of Screen)

LC 200 250 --- cd/m2

Contrast Ratio CR 700 1000 --- -

Response Time

T

R

θx=0°,θY=0°

--- 1.5 2.5 ms

TF --- 3.5 5.5 ms

White Variation 　　δW θx=0°,θY=0° 75 --- -

Viewing Angle

Horizontal θx- +θx+

CR ≧10

BM-5A

150 170 ---

Deg.

Vertical θy- + θy+ 140 160 ---

Horizontal θx- +θx+

CR ≧5

BM-5A

160 178 ---

Vertical θy- + θy+ 150 170 ---

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5. Block Diagram

5.1 Main Board

Scalar IC HX6822-A

(Include MCU, ADC, OSD)

(U401)

D-SUB

Connector

(CN101)

EEPROM

MX25L2026DM1I-12G

(U402)

D-HS
D-VS

RGB

LCD Interface

(CN410)

Key Control

interface
(CN408)

Crystal
12MHz
(X401)

EEROM
M24C02

(U101)

DDC1-SCL
DDC1-SDA

DVI

Connector

(CN102)

EEROM

M24C02

(U104)

DDC2-SDA
DDC2-SCL

17

5.2 Power Board

EMI filter

Start Resistor

(R911)

PW Control

LD7576AGR

(U901)

Transformer

(T901)

AC input

5V

Bridge
Rectifier
and Filter

Feedback

Circuit

Rectifier
diodes

Photo coupler

(U902)

14.5V

Power Switch

(Q901)

D801

LED

(CN804)

PWM Control

OZ9998BGN

(U801)

14.5V

DIM

ON/OFF

L801

Q801