AOC 931FWZ Schematic

19" LCD Color Monitor AOC 931Fwz

Service

Horizontal Frequency

30-83 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…………...............……...........6

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

3.2. Control Button…………….…..............……...............6

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

4. Input/Output Specification............……………............10

4.1. Input Signal Connector............………….................10

4.2. Power Supply Requirements...............................11

4.3. Factory Preset Display Modes……..........................11

4.4. Panel Specification.....………...………..................12

5. Block Diagram….......................…………................14

5.1. Software Flow Chart……………………....….......14

5.2. Electrical Block Diagram…………..….......16

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

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

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

6.3. KEY Board...……....................................25

7. PCB Layout...……….......................................26

7.1. Main Board………........................................26

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

7.4. Key Board……………....................................32

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

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

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

9. White-Balance, Luminance adjustment............40

10. Monitor Exploded View………..…….............42

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

12. Different Parts List……………………............54

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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19" LCD Color Monitor AOC 931Fwz

Revision List

Version Release Date Revision History TPV Model Name

T97MMTNQW6A16N

A00 July 18, 2008 Initial release

T98MMTMCW6PUDN

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19" LCD Color Monitor AOC 931Fwz

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.

WARNI NG

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 AOC 931Fwz

1. Monitor Specifications

Model number 931Fwz

Driving system TFT Color LCD

Viewable Image Size 481mm diagoanl

LCD Panel

Resolution

Pixel pitch 0.243mm(H) x 0.243mm(V)

Video R, G, B Analog lnterface & Digital Interface

Separate Sync. H/V TTL

Display Color 16.7M Colors

Dot Clock 146.25 MHz

Horizontal scan range 30 kHz - 83 kHz

Horizontal scan Size(Maximum) 408.24mm

Vertical scan range 55 Hz - 75 Hz

Vertical scan Size(Maximum) 255.15mm

Optimal preset resolution 1680 x 1050 (60 Hz)

Highest preset resolution 1680 x 1050 (60 Hz)

Plug & Play VESA DDC2B/CI

Input Connector D-Sub 15pin & DVI-D

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

Input Video Signal

Digital Interface (TMDS)

Power Source 100~240VAC, 50/60Hz

Physical

Characteristics

Environmental

Power Consumption

Speakers 2 x 2W

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

Signal Cable Type Detachable

Dimensions & Weight:

Height (with base)

Width

Depth

Weight (monitor only)

Weight (with packaging)

Temperature:

Operating 0° to 40°

Non-Operating -20°to 60°

Humidity:

Operating 10% to 85% (non-condensing)

Active < 37 W

Standby < 2 W

374 mm

454 mm

220 mm

4.1 kg

5.8 kg

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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19" LCD Color Monitor AOC 931Fwz

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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 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.

Flat Panel and

CCFL backlight

Main Board

Key Board

HOST Computer

DVI

D-SUB

Video signal, DDC

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19" LCD Color Monitor AOC 931Fwz

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. Eco mode / -

2. Volume / +

3. Power Button & Indicator

4. Source (Auto) / Exit

5. Menu / Enter

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19" LCD Color Monitor AOC 931Fwz

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 t he 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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19" LCD Color Monitor AOC 931Fwz

Function Control Illustration

Luminance Adjust Range Description

Brightness 0-100 Backlight Adjustment

Contrast 0-100 Contrast from Digital-register

Standard Mode

Standard

Text Mode

Text

Internet Mode

Eco mode

Internet

Game Mode

Game

Gamma

DCR

Image Setup

Clock 0-100 Adjust picture Clock to reduce Vertical-Line noise.

Phase 0-100

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

Movie

Sports

Gamma1

Gamma2

Gamma3 Adjust to Gamma 3

Off

On

Movie Mode

Sports Mode

Adjust to Gamma 1

Adjust to Gamma 2

Disable dynamic contrast ratio

Enable dynamic contrast ratio

Adjust Picture Phase to reduce Horizontal-Line

noise

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

Color Temp

Warm

Normal

Cool

sRGB

User

6500K

7300K

9300K

Red Red Gain from Digital-register

Green Green Gain Digital-register.

Blue Blue Gain from Digital-register

Recall Warm Color Temperature from EEPROM.

Recall Normal Color Temperature from EEPROM.

Recall Cool Color Temperature from EEPROM.

Recall SRGB Color Temperature from EEPROM.

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19" LCD Color Monitor AOC 931Fwz

Color Boost

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

H. position 0-100 Adjust Frame horizontal Position

V.position 0-100 Adjust Frame vertical Position

Bright Frame on or off Disable or Enable Bright Frame

OSD Setup

H.Position 0-100 Adjust the verticalposition of OSD

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

Timeout 5-120 Adjust the OSD Timeout

Transparence 0-100 Adjust the transparence of OSD

Language

Extra

Input Select

Auto Select to Auto Detect input signal

Analog Select Analog Sigal Source as Input

Select the OSD language

Digital Select Digital Sigal Source as 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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19" LCD Color Monitor AOC 931Fwz

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

Digital 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 -

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19" LCD Color Monitor AOC 931Fwz

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 720×400 31.47 70

VGA 640×480 31.47 60

VGA 640×480 37.5 75

SVGA 800×600 37.879 60

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)

SVGA 800×600 46.875 75

XGA 1024×768 48.363 60

XGA 1024×768 56.476 70

XGA 1024×768 60.02 75

XGA 1024×768 48.78 60

XGA 1024×768 60.241 75

SXGA 1280×1024 64 60

SXGA 1280×1024 80 75

WXGA 1440×900 55.93 60

WXGA 1440×900 70.637 75

WSXGA 1680×1050 65.29 60

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19" LCD Color Monitor AOC 931Fwz

4.4 Panel Specification

4.4.1 General Features

M190Z1-L01 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins

2ch-LVDS interface. This module supports 1680 x 1050 WSXGA+ mode and can display 16.7M colors.

The inverter module for Backlight is not built in.

- Super Wide viewing angle.

- Super High contrast ratio

- Super fast response time

- High color saturation

- WSXGA+ (1680 x 1050 pixels) resolution

- DE (Data Enable) only mode

- LVDS (Low Voltage Differential Signaling) interface

- RoHS Compliance

4.4.2 Display Characteristics

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19" LCD Color Monitor AOC 931Fwz

4.4.3 Optical Characteristics

4.4.4 Electrical Characteristics

(1) TFT-LCD

(2) Backlight

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19" LCD Color Monitor AOC 931Fwz

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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19" LCD Color Monitor AOC 931Fwz

1) MCU initializes.

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

disappears.

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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19" LCD Color Monito AOC 931Fwz

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)

_SDA

y

5.2 Electrical Block Diagram

5.2.1 Main Board

LCD Interface

CN301

Flash Memory

SST25LF020A

(U402)

EEPROM

M24C04 (U403)

Scalar TSUMO58GHL-LF

(Include MCU, ADC, OSD)

(U401)

Key Control

Interface (CN402)

Crystal

14.31818MHZ (X401)

D-Sub Connector

DSUB_SCL DSUB

H sync V s

(CN101)

nc

H sync V sync

RGB

VGA_R+ VGA_G+ VGA_B+

DAT+

D-Date D-Clock

DVI Connector

(CN102)

RXP RXN

DAT-

RXCP RXCN

HPD

DVI_HPD

DDC_SCL DDC_SDA

ESD

AZC099-04S

(U107)

ESD

AZC099-04S

(U104)

ESD

AZC099-04S

(U103)

ESD

AZC099-04S

(U105)

ESD

AZC099-04S

(U106)

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19" LCD Color Monito AOC 931Fwz

5.2.2 Inverter/Power Board

AC input

EMI filter

BridgeRectifier and Filter

Transformer

Rectifier diodes

Start Circuit: R904, R905, R906

PWM Control IC

Feedback

Circuit

CN902

5V

16V

ON/OFF

Lamp

Output

Circuit

Feedback Circuit

Transformer

Over Voltage

MOSFET

PWM

Control IC （U801）

ON/OFF Control

DIM

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