Envision H2476WDHAL Service Manual

23.6" LCD Monitor Envision H2476WDHAL

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……..........................14

4.3.Panel Specification…………..………………………..15

5.Block Diagram….........................................................17

5.1.Main Board…..….............................................17

5.2.Power Board…………..…………………………......18

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

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

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

6.3.Key Board…............……....................................27

7.PCB Layout..………..............................................28

7.1.Main Board………..…........................................28

7.2.Power Board….…..............................................30

7.3.Key Board………..…..........................................32

8.Maintainability………............................................33

8.1.Equipments and Tools Requirement…...............33

8.2.Trouble Shooting…..………...............................34

9.White-Balance,Luminance Adjustment…..............38

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

11.BOM List…………..……………………….............42

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

Revision List

Version Release Date Revision History TPV Model Name

A01 Sep.07.2012 Initial release HDB2NU2BAJE1DN

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.)

1. Monitor Specifications

LCD Panel

Model number H2476WDHAL

Driving system TFT Color LCD

Viewable Image Size 59.8cm diagoanl

Pixel pitch 0.2715mm(H) x 0.2715mm(V)

Separate Sync. H/V TTL

Display Color 16.7M Colors

Dot Clock 170 MHz

Resolution

Horizontal scan range 30 kHz -83 kHz

Horizontal scan Size(Maximum) 521.28mm

Vertical scan range 50 Hz - 76 Hz

Vertical scan Size(Maximum) 293.22mm

Optimal preset resolution 1920 x 1080 (60 Hz)

Highest preset resolution 1920 x 1080 (60 Hz)

Plug & Play VESA DDC2B/CI

Input Connector D-Sub 15pin & DVI-D,HDMI

Input Video Signal

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

DVI-D Digital Interface (TMDS),HDMI

Power Source 100-240VAC, 50/60Hz

Power Consumption

Active < 35 W

Standby < 0.5 W

Physical

Characteristics

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

Signal Cable Type Detachable

Dimensions & Weight:

Height (with base) 399.9 mm

Width 571.4 mm

Depth 211.2 mm

Weight (monitor only) 3.98 kg

Environmental

Temperature:

Operating 0°C to 40° C

Non-Operating -25°Cto 55°C

Humidity:

Operating 10% to 85% (non-condensing)

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

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

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 On/off the monitor.

Volume adjustment hot key

When there is no OSD, press Volume (-) to active volume adjustment bar, press - or + to adjust volume.

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.

Connecting the Monitor

Cable Connections On Back of Monitor and Computer:

1. Power .

2. HDMI

3. DVI

4. Analog (DB-15 VGA cable

5. Audio 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 (Optional-Requires a video card with HDMI port)- Connect one end of the HDMI cable to the back of the monitor and connect the other end to the computer's HDMI port. 3 (Optional – Requires a video card with DVI port) - Connect one end of the DVI cable to the back of the monitor and connect the other end to the computer’s DVI port. 4 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. 5 Connect the audio cable to audio in port on the back of the monitor. 6 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.

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.

Function Control Illustration

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+

TMDS Data 2/4

Shield

TMDS Data 1/3

Shield

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 -

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

1 TMDS Data 2+ 9 TMDS Data 0 17 DDC/CEC Ground

TMDS Data 2

Shield

10 TMDS Clock + 18 +5V Power

3 TMDS Data 2 11

TMDS Clock

Shield

19 Hot Plug Detect

4 TMDS Data 1+ 12 TMDS Clock

TMDS Data

1Shield

13 CEC

6 TMDS Data 1 14

Reserved (N.C.

on device)

7 TMDS Data 0+ 15 SCL

TMDS Data 0

Shield

16 SDA

4.2 Factory Preset Display Modes

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

VGA

640x480@60Hz 31.469 59.94

640x480@72Hz 37.861 72.809

640x480@75Hz 37.5 75

SVGA

800x600@56Hz 35.156 56.25

800x600@60Hz 37.879 60.317

800x600@72Hz 48.077 72.188

800x600@75Hz 46.875 75

XGA

1024x768@60Hz 48.363 60.004

1024x768@70Hz 56.476 70.069

1024x768@72Hz 57.669 71.996

1024x768@75Hz 60.023 75.029

SXGA

1280x1024@60Hz 63.981 60.02

1280x1024@75Hz 79.976 75.025

WXGA 1440x900@60Hz 55.935 55.887

WSXGA 1680x1050@60Hz 65.29 59.95

WUXGA 1920x1080@60HZ 67.5 59.934

IBM-MODE DOS 720x400@70Hz 31.469 70.087

MAC MODE VGA 640x480@67Hz 35 66.667

MAC MODE SVGA 832x624@75Hz 49.725 74.551

4.3 Panel Specification

4.3.1 General Features

LCM236H3L01A00C M236HGE-L10 is a 23.6” TFT Liquid Crystal Display module with WLED Backlight unit and 30Pins 2ch-LVDS interface. This module supports 1920 x 1080 Full HD mode and can display up to 16.7M colors.

4.3.2 Display Characteristics

ITEMS Unit SPECIFICATIONS

Screen Size 23.547” real diagonal

Driver Element - a-si TFT active matrix -

Pixel Number Pixel 1920 x R.G.B. x 1080 pixel

Pixel Pitch Mm 0.2715 (H) x 0.2715 (V) mm

Pixel Arrangement - RGB vertical stripe -

Display Colors - 16.7M color

Tran missive Mode Color Normally white

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

Luminance, White Cd/m2 250 Cd/m2

Color Gamut - 72% of NTSC(Typ.)

TCO - TCO 5.0 compliance

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 I

rush

1.52 3 A

Power Supply Current—White

0.39 0.48 A

Power Supply Current—Black 0.98 1.27 A

Power Supply Current--Vertical Stripe 0.95 1.27 A

Power Consumption PLCD (4.9) (6.35) A

LVDS differential input voltage VID 200 - 600 mV

LVDS common input voltage VIC 1.0 1.2 1.4 V

Logic High Input Voltage VIH 2.64 3.6 V

Logic Low Input Voltage VIL 0 0.66 V

4.3.4 Backlight Unit

Parameter Symbol

Value

Unit

Min Typ. Max.

Light Bar Input Voltage V

LED

47.3 54.4 63.2 VDC

Light Bar Input Current I

LED

58 60 63 mA

Power Consumption P

LED

- 13 15 W

LED Life Time LBL 30000 - - Hrs

IFP LED Peak forward current I

LED

- - 180 mA

4.3.5 Optical Characteristics

Item Symbol

Conditions

Min. Typ. Max. Unit

Color

Chromaticity

(CIE 1931)

Red



=0°,



=0°

R=G=B=255

Grayscale

Typ –

0.03

0.64

Typ +

0.03

Ry 0.338

Green

Gx 0.311

Gy 0.619

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/m

Contrast Ratio CR 700 1000 - -

Response Time



=0°,



=0°

- 1.3 2.2 ms

TF - 3.7 5.5 ms

White Variation





=0°,



=0° 75 80 - -

Viewing

Angle

Horizontal -

CR 10≧

BM-5A

150 170 -

Deg.

Vertical - 140 160 -

Horizontal -

CR 5≧

BM-5A

160 178 -

Vertical - 150 170 -

5. Block Diagram

5.1 Main Board

Scalar IC NT68676UFG

(Include MCU, ADC, OSD)

(U401)

D-SUB

Connector

(CN101)

EEPROM

Pm25LD020C-SCE

(U402)

D-HS D-VS

RGB

LCD Interface

(CN408)

Key Control

interface (CN404)

Crystal 12MHz (X401)

EEROM

M24C02-RMN6TP

(U101)

DDCA-SDA DDCA-SCL

DVI

Connector

(CN102)

EEROM

M24C02-RMN6TP

(U105)

SCL_DVI SDA_DVI

HDMI

Connector

(CN501)

EEROM

M24C02-RMN6TP

(U109)

HDMI -SCL

HDMI-SDA

5.2 Power Board

EMI filter

Start Resistor

(R913)

PW Control

LD7576JGR

(IC901)

Transformer

(T901)

AC input

Bridge Rectifier and Filter

Feedback

Circuit

Rectifier diodes

Photo coupler

(IC902)

14.5V

Power Switch

(Q904)

D801

LED

(CN804)

PWM Control

OZ9998BGN

(U801)

14.5V

DIM

ON/OFF

L801

Q801

+ 40 hidden pages

Envision H2476WDHAL Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual