AOC 931FWZ Schematic

19" LCD Color Monitor

AOC 931Fwz

Service

Service

Service

						Horizontal Frequency
						30-83 kHz
		TABLE OF CONTENTS
Description		Page			Description	Page
Table Of Contents.......……..............................…........1					5.2. Electrical Block Diagram…………..….......16
Revision	List.…........................................……......2				6. Schematic……………......................................18
Important	Safety	Notice.……..................……......3			6.1. Main Board………..........................................18
1. Monitor Specification..............................………........4					6.2. Power Board...……....................................22
2. LCD Monitor Description…………………………….......5					6.3. KEY Board...……....................................25
3. Operation Instruction…………...............……...........6					7. PCB Layout...……….......................................26
3.1. General Instructions...........................…...........6					7.1. Main Board………........................................26
3.2. Control Button…………….…..............……...............6					7.2. Power	Board….......................................29
3.3. OSD Menu…………….…..........................…............8					7.4. Key Board……………....................................32
4. Input/Output Specification............……………............10					8. Maintainability……….......................................33
4.1. Input Signal Connector............………….................10					8.1. Equipments and Tools Requirement..............33
4.2. Power Supply Requirements...............................11					8.2. Trouble Shooting………….............................34
4.3. Factory Preset Display Modes……..........................11					9. White-Balance, Luminance adjustment............40
4.4. Panel Specification.....………...………..................12					10. Monitor Exploded View………..…….............42
5. Block Diagram….......................…………................14					11.BOM List…………………………………............43
5.1. Software Flow Chart……………………....….......14					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
	A00	July 18, 2008	Initial release	T97MMTNQW6A16N
				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.

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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19" LCD Color Monitor			AOC 931Fwz
1. Monitor Specifications
		Model number	931Fwz
		Driving system	TFT Color LCD
		Viewable Image Size	481mm diagoanl
	LCD Panel	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)
	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
			Digital Interface (TMDS)
		Power Source	100~240VAC, 50/60Hz
		Power Consumption	Active < 37 W
			Standby < 2 W
		Speakers	2 x 2W
		Connector Type	15-pin Mini D-Sub & DVI-D
		Signal Cable Type	Detachable
		Dimensions & Weight:
	Physical
		Height (with base)	374 mm
	Characteristics
		Width	454 mm
		Depth	220 mm
		Weight (monitor only)	4.1 kg
		Weight (with packaging)	5.8 kg
		Temperature:
		Operating	0° to 40°
		Non-Operating	-20°to 60°
		Humidity:
	Environmental
		Operating	10% to 85% (non-condensing)
		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

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

							DVI
Power board			Main Board
							D-SUB
(Include: adapter, inverter, audio)
						Video signal, DDC
		Key Board
AC-IN
			HOST Computer
100V-240V

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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.

3.2Control 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	Standard Mode
			Text	Text Mode
			Internet	Internet Mode
		Eco mode
			Game	Game Mode
			Movie	Movie Mode
			Sports	Sports Mode
			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

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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		Select the OSD language
	Extra
		Auto	Select to Auto Detect input signal
	Input Select
		Analog	Select Analog Sigal Source as Input
		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		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

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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					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		720×400			31.47	70
		VGA		640×480			31.47	60
		VGA		640×480			37.5	75
		SVGA		800×600			37.879	60
		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

5. Block Diagram

5.1 Software Flow Chat

1

2

N

4

5

Y

6

7

Y

9

AOC 931Fwz

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

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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

5.2 Electrical Block Diagram

5.2.1 Main Board

LCD Interface

(CN301)

Flash Memory

Key Control

SST25LF020A

(U402)

Scalar TSUMO58GHL-LF

Interface (CN402)

(Include MCU, ADC, OSD)

EEPROM

(U401)

Crystal

M24C04 (U403)

14.31818MHZ (X401)

H sync

D-Date

V sync

RGB

D-Clock

HPD

DVI_HPD

ESD

D-Sub Connector

DVI Connector

AZC099-04S

(CN101)

(CN102)

DDC_SCL

(U107)

VGA_R+

DDC_SDA

DSUB_SCL H sync

RXP

RXCP

VGA_G+

DAT+

DAT-

DSUB_SDA V sync

RXN

RXCN

VGA_B+

ESD

ESD

ESD

ESD

AZC099-04S

AZC099-04S

AZC099-04S

AZC099-04S

(U104)

(U103)

(U105)

(U106)

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19" LCD Color Monito										AOC 931Fwz
5.2.2 Inverter/Power Board
AC input
	EMI filter			BridgeRectifier		Transformer		Rectifier
				and Filter				diodes

Start Circuit: R904, R905, R906						CN902
						5V
					Feedback
	PWM
					Circuit
	Control IC					16V

ON/OFF

Output

Transformer

MOSFET

Lamp

Circuit

ON/OFF

Feedback

PWM

Control

Circuit

Control IC

DIM

Over Voltage

U801

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