AOC 196v Schematic

AOC 196V

SERVICE MANUAL

19” LCD Monitor

196V

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

1

AOC 196V

Table of Content

Revision List…………………………………………………………………………………………………………. 3

1.Monitor Specifications………………………………………………………………………………………….. 4

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

3.Operating Instructions………………………………………………………………………………………….. 6

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

3.2Control Buttons………………………………………………………………………………………………... 6

3.3Adjusting the Picture………………………………………………………………………………………….. 7

4.Input/Output Specification……………………………………………………………………………………... 9

4.1Input Signal Connector……………………………………………………………………………………….. 9

4.2Factory Preset Display Modes……………………………………………………………………………….. 10

4.3 Power Supply Requirements………………………………………………………………………………… 11

4.4Panel Specification………………………………………………………………………………………….… 11

4.4.1Panel Feature…………………………………………………………………………………………….. 11

4.4.2Display Characteristics………………………………………………………………………………….. 11

4.4.3Optical Characteristics…………………………………………………………………………………… 12

4.4.4 Parameter Guide Line For CCFL Inverter……………………………………………………………… 13

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

5.1Monitor Exploded View……………………………………………………………………………………….. 14

5.2Software Flow Chart…………………………………………………………………………………………... 15

5.3Electrical Block Diagram……………………………………………………………………………………… 17

5.3.1Main Board………………………………………………………………………………………………... 17

5.3.2Inverter/Power Board………………………………………………………….…………………………. 18

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

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

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

6.3Audio Board……………………………………………………………………….………………………….. 28

7.PCB Layout………………………………………………………………………………………………………. 30

7.1Main Board…………………………………………………………………………………………………….. 30

7.2Power Board………………………………………………………………………….……………………….. 31

7.3Audio Board…………………………………………………………….……………………………………… 31

7.4Key Board……………………………………………………………………………………………………… 31

8.Maintainability……………………………………………………………………………………………………. 32

8.1 Equipments and Tools Requirement………………………………………………………………………… 32

8.2Trouble Shooting…………………………………………………………………………………………….… 33

8.2.1Main Board………………………………………………………………………………………………... 33

8.2.2Power /Inverter Board……………………………………………………………………………………. 36

8.2.3Keypad Board…………………………………………………………………………………………….. 38

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

10.EDID Content……………………………………………………………………………………………………. 40

11.BOM LIST………………………………………………………………………………………………………... 41

2

AOC 196V

Revision List

Revision	Date	TPV Name	Change Description
A00	Nov-08-05	T980KH2HD4A1A	Original Revision

3

				AOC 196V
1.MONITOR SPECIFICATIONS
		Driving system		TFT Color LCD
		Size		48.0cm(19.0")
	LCD Panel
		Pixel pitch		0.294mm( H )x 0.294mm( V )
		Viewable angle		140˚ (H) 130˚ (V) (CR>10)
		Response time (type)		8 ms for HSD panel
		Sync. Type		H/V TTL
	Input
		H-Frequency		30kHz – 83kHz
		V-Frequency		55-75Hz
	Display Color		16.1M (6-bits+FRC)
	Dot Clock			135MHz
	Contrast Ratio		600:1
				250cd/m2
	White Luminance
	Max. Resolution			1280 x 1024
			VESA DDC2BTM
	Plug & Play
			ON Mode<55W
	Power Consumption
			OFF Mode<3W
	Power Source		100~240VAC,47~63Hz
			Horizontal : 376.32mm
	Maximum Screen Size
			Vertical: 301.056mm
		Operating Temp: 0°C to 40°C
	Environmental
		Storage Temp: -20°C to 60°C
	Considerations
		Operating Humidity: 15% to 90%

4

AOC 196V

2. LCD MONITOR DESCRIPTION

The LCD MONITOR will contain a main board, a power board, a keypad board and an audio 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

PWPC board

Main Board

RS232 Connector

(Include: adapter, inverter)

For white

balance

adjustment

in factory

mode

Audio board

Keyboard

AC-IN

Video signal,

100V-240V

HOST Computer

5

AOC 196V

3. OPERATING INSTRUCTIONS

3.1 GENERAL INSTRUCTIONS

Press the power button to turn the monitor on or off. The other control buttons 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.

-Connect the video cable from the monitor to the video card.

-Press the power button to turn on the monitor, the power indicator will light up.

3.2CONTROL BUTTONS

-Power Button:

When pressed, the monitor enters the off mode, and the LED turns blank. Press again to restore normal status.

-Left / Right Button:

The Left/Right Button is used to control the monitor functions. Press to switch functions or adjust settings.

-Auto Adjust Key:

The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and Phase.

-Power Indicator:

Blue	— Power On mode.
Orange	— Power Saving mode.
Blank	—Power Off Mode.

LED = GREEN, BLINKING (0.5s period) —Out of Range

NO.	Name	Within OSD	Without OSD
1	MENU	Select Function or select Sub menu	Activate OSD main menu
2	VOL+ /	Adjust up when menu item selected	Increase the value of volume
3	POWER	Power On / Off	Power On / Off
4	VOL-/	Adjust down when menu item selected	Decrease the value of the volume
5	Auto/EXIT	Exit OSD or back to previous menu	Auto configuration

6

AOC 196V

3.3 ADJUSTING THE PICTURE

Adjustment steps:

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

2.Press < or > to select the desired function.

3.Press the MENU-button to select the function that you want to adjust.

4.Press < or > to change the settings of the current function.

5.To exit and save, select the exit function, or leave the monitor alone for 10 seconds. If you want to adjust any other function, repeat steps 2-4.

OSD TABLE:

Main Menu

Main Menu

Sub Menu Item

Sub Menu Icon

Description

Item

Icon

Contrast

Contrast from Digital-register.

Luminance

Brightness

Backlight Adjustment

Focus

Adjust

Picture

Phase to

reduce

Horizontal-Line noise

Image Setup

Clock

Adjust

picture

Clock

to

reduce

Vertical-Line noise.

H. Position

Adjust the horizontal position of the

Image

picture.

Position

V. Position

Adjust

the vertical position

of the

picture.

Color Temp.

Warm

N/A

Recall

Warm

Color

Temperature

from EEPROM.

Cool

N/A

Recall Cool Color Temperature from

EEPROM.

sRGB

N/A

Recall

sRGB

Color

Temperature

from EEPROM.

User / Red

Red Gain from Digital-register.

User / Green

Green Gain Digital-register.

7

AOC 196V

User / Blue

Blue Gain from Digital-register.

Auto Config

Yes

N/A

Auto Adjust the H/V Position, Focus

and Clock of picture.

(Analog-Only

Do not execute Auto Config, return

Model)

No

N/A

to main menu.

H. Position

Adjust the horizontal position of the

OSD.

OSD Setup

V. Position

Adjust the

vertical position

of

the

OSD.

OSD Timeout

Adjust the OSD timeout.

English

N/A

Set

OSD

display

language

to

English.

Deutsch

N/A

Set

OSD

display

language

to

German.

Language

Français

N/A

Set

OSD

display

language

to

French.

Español

N/A

Set OSD display language to Spain.

Italiano

N/A

Set OSD display language to Italian.

N/A

Set

OSD

display

language

to

Simplified Chinese.

Show the resolution, H/V frequency

Information

Information

N/A

and

input

port

of

current

input

timing.

Clear

each

old

status

of

Yes

N/A

Auto-configuration and set the color

Reset

temperature to Cool.

No

N/A

Do not execute reset, return to main

menu.

Exit

N/A

N/A

Exit OSD

8

AOC 196V

4. Input/Output Specification

4.1 Input Signal Connector

1 D-SUB connector

PIN NO.	DESCRIPTION	PI N NO.	DESCRIPTION
1.	Red Video	9.	No Pin!
2.	Green Video	10.	Logic Ground
3.	Blue Video	11.	Monitor Ground
4.	Monitor Ground	12.	DDC-Serial Data
5.	DDC-Return	13.	H-Sync
6.	Red Ground	14.	V-Sync
7.	Green Ground	15.	DDC-Serial Clock
8.	Blue Ground

VGA connector layout

	1	5
	6	10
	11	15
2 DVI connector
PIN NO.	DESCRIPTION	PI N NO.	DESCRIPTION
1.	TMDS data 2	13.	TMDS data 3
2.	TMDS data 2	14.	5V Power
3.	TMDS data 2/4 Shield	15.	GND (return for +5v,hsync, vsync)
4.	TMDS data 4	16.	Hot Plug Detect
5.	TMDS data 4	17.	TMDS data 0
6.	DDC Clock	18.	TMDS data 0
7.	DDC Data	19.	TMDS data 0/5 Shield
8.	Analog Vertical Sync	20.	TMDS data 5
9.	TMDS data 1	21.	TMDS data 5
10.	TMDS data 1	22.	TMDS Clock Shield
11.	TMDS data 1/3 Shield	23.	TMDS Clock +
12.	TMDS data 3	24.	TMDS Clock
	24 - Pin Color Display Signal Cable

9

AOC 196V

4.2 Factory Preset Display Modes

VESA MODES

				Horizontal		Vertical
				Nominal		Nominal		Nominal
					Sync		Sync	Pixel
Mode	Resolution	Total		Frequency		Freq.
					Polarity		Polarity	Clock
				+/- 0.5kHz		+/- 1 Hz
								(MHz)
	640x480@60Hz	800 x 525		31.469	N	59.940	N	25.175
VGA
	640x480@72Hz	832 x 520		37.861	N	72.809	N	31.500
	640x480@75Hz	840 x 500		37.500	N	75.00	N	31.500
	800x600@56Hz	1024 x 625		35.156	N/P	56.250	N/P	36.000
SVGA	800x600@60Hz	1056 x 628		37.879	P	60.317	P	40.000
	800x600@72Hz	1040 x 666		48.077	P	72.188	P	50.000
	800x600@75Hz	1056x625		46.875	P	75.000	P	49.500
	1024x768@60Hz	1344x806		48.363	N	60.004	N	65.000
XGA
	1024x768@70Hz	1328x806		56.476	N	70.069	N	75.000
	1024x768@75Hz	1312x800		60.023	P	75.029	P	78.750
SXGA	1280x1024@60Hz	1688x1066		63.981	P	60.020	P	108.000
	1280x1024@75Hz	1688x1066		79.976	P	75.025	P	135.000
			IBM MODES
				Horizontal		Vertical
DOS	720x400@70Hz	900 x 449		31.469	N	70.087	P	28.322
DOS	640x400@70Hz	800 x 449		31.469	N	70.087	P	25.175
XGA	1024x768@72Hz	1304 x 798		57.515	P	72.1	P	75.000
			MAC MODES
VGA	640x480@67Hz	864x525		35.000	N	66.667	N	30.240
SVGA	832x624@75Hz	1152x667		49.725	N	74.551	N	57.2832
XGA	1024x768@60Hz	1312x813		48.780	N	60.001	N	64.000
	1024x768@75Hz	1328x804		60.241	N	74.927	N	80.000

10

AOC 196V

4.3 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)

4.4 PANEL SPECIFICATION

4.4.1Panel Feature

■19”SXGA TFT LCD panel

■4 CCFLs Backlight system

■Supported SXGA (V:1024 lines, H:1280 pixels) resolution

■Supported to 75Hz refresh rate

■LCD Timing Controller

■Compatible with RoHS standard

4.4.2Display Characteristics

11

AOC 196V

4.4.3 Optical Characteristics

12

AOC 196V

4.4.4Parameter guide line for CCFL Inverter

1.TFT LCD Module:

2.Back Light Unit:

13

AOC 196V

5. Block Diagram

5.1 Monitor Exploded View

1		FUNCTION 33G6288-Y-L	8	HINGE 37G 510-2
2		LENS 33G6289-1	9	HINGE BRACKET 15G6206-1
3		BEZEL 34G6201-Y-1B	10	STAND 34G1546-Y-B
4		PANEL BRACKET 15G6207-L-3	11	BASE 34G6203-Y-2B
5		PANEL BRACKET 15G6207-R-3	12	RUBBER FOOT 12G394-3
6		REAR COVER 34G6202-Y-1B	13	MYLAR 52G6025-11-925
7		SHIELD 85G6119-1

14

AOC 176V

5.2 Software Flow Chart

1

2	Y	3

N

4

5 N

Y

6

7	N	8

Y

9

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

18	N	19

Y

Page 15 of 54

AOC 176V

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?

Page 16 of 54

AOC 176V

5.3 Electrical Block Diagram

5.3.1 Main Board

LCD Interface

(CN503)

MCU
		Scalar TSU56AK-LF
W78E65P-40
(U601)		(Include ADC,OSD)
		(U401)

EPR_SDA

EPR_SCL

EEPROM		H sync
AT24C16N		V sync
(U602)		RGB
			D-Sub
			Connector
			(CN301)
		DB15_SDA,
		DB15_SCL
			EEPROM
			24C02
			(U301)

D_H sync

D_V sync

D_RGB

DVI-I only

Connector

(CN302)

DDC2_SDA,

DDC2_SCL

EEPROM 24C02 (U302)

Page 17 of 54