Sony vx724 1 Service Manual

Service Manual

ViewSonic VX724-1

Model No. VS10049

17” Color TFT LCD Display

ViewSonic

(VX724-1_SM Rev. 1b Jun. 2006)



381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Copyright reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners.

ECR Number

06/06/05

06/23/06

VS-E060083

Revision History

Description of Changes

Initial Release

updated RSPL,BOM,EPL,PPL

EditorRevision SM Editing Date

A. Lu

Jamie C.

ViewSonic Corporation Confidential

Do Not Copy

VX724-1

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 5

3. Front Panel Function Control Description 17

4. Circuit Description 23

5. Adjustment Procedure 35

6. Troubleshooting Flow Chart 57

7. Recommended Spare Parts List 63

8. Exploded Diagram and Exploded Parts List 68

9. Block Diagram 79

10. Schematic Diagrams 81

11. PCB Layout Diagrams 89

ViewSonic Corporation Confidential

Do Not Copy

VX724-1

1. Precautions and Safety Notices

1. Appropriate Operation

(1) Turn off the product before cleaning. (2) Use only a dry soft cloth when cleaning the LCD panel surface. (3) Use a soft cloth soaked with mild detergent to clean the display housing. (4) Use only a high quality, safety approved AC/DC power cord. (5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time. (6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off. (7) Do not touch the LCD panel surface with sharp or hard objects. (8) Do not place heavy objects on the LCD display, video cable, or power cord. (9) Do not use abrasive cleaners, waxes or solvents for your cleaning. (10) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas containing excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- In direct sunlight.

2. Caution

No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar

with all of the following safety checks and servicing guidelines.

3. Safety Check

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is

exposed in such areas as the associated transformer circuits.

4. LCD Module Handling Precautions

4.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it. (2) Be sure to turn off power supply when connecting or disconnecting input connector. (3) Wipe off water drops immediately. Long contact with water may cause discoloration or spots. (4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. (5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface. (6) Since CMOS LSI is used in this module, take care of static electricity and ensure human earth when handling. (7) Do not open or modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module in any direction. (9) In the event that a Module must be put back into the packing container slot after it was taken out of the

container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the

CFL Reflector edge softly. Otherwise the TFT Module may be damaged.

(10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface

Connector of the TFT Module.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or

bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration

that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module

may be damaged.

(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local

ordinances or regulations for disposal.

(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module

should be supplied with power that complies with the requirements of Limited Power Source

(IEC60950 or UL1950), or an exemption should be applied for.

(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950

or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Correct methods : Incorrect Methods :

Only touch the metal frame of the panel or the front cover of the monitor. Do not touch the surface of the polarizer .

If the surface of the panel is pressed by fingers, this may cause "MURA."

Take out the monitor by grasping the cushion. If the monitor is removed by grasping the LCD

panel, that may cause "MURA."

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Correct Methods : Incorrect Methods :

Place the monitor on a clean & soft foam pad . If the monitor is placed on foreign objects,

that could scratch the surface of the panel.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

2. Specification

GENERAL SPECIFICATION

Test Resolution & Frequency 1280x1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls

VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A

Digital Input Connector DVI-I (Digital), refer the appendix B

Default Input Connector Defaults to the first detected input

Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes

Video Cable Connector DB-15 Pin out Compliant DDC 2B

Video Signals

Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)

Maximum PC Video Signal 950 mV with no damage to monitor

Maximum Mac Video Signal 1250 mV with no damage to monitor

DDC 1/2B Compliant with Revision 1.3

Sync Compatibility Separate Sync, Composite Sync, SOG

Video Compatibility

Resolution Compatibility

Exclusions Not compatible with interlaced video

Factory Default:

Contrast = 70%, Brightness = 100%

1. Video RGB (Analog)

Separate, Composite, and Sync on Green

2. TMDS (Digital)

Shall be compatible with all PC type computers,

Macintosh computers, and after market video cards

640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x

600, 832 x 624, 1024 x 768, 1152 x 864, 1152 x 870,

1280 x 720, 1280 x 1024

* The image vertical size might not be full screen, but

the image vertical position should be at the center.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

POWER SUPPLY

Internal Power Supply Part Number: FSP035-1PI01

Input Voltage Range 90 TO 264 VAC

Input Frequency Range 47.5 TO 63 HERTZ

Short Circuit Protection Output can be shorted without damage

Over Current Protection 5.0 A typical at 12.0 VDC

Leakage Current 3.5mA (Max) at 254VAC / 60Hz

EFFICIENCY 65 % typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 32 Watts (typ)

Max Input AC Current 1.0 Arms @ 90VAC, 0.6 Arms @265VAC

INRUSH CURRENT (COLD START) 60 A @ 120VAC

Shall start and function properly when under full load,

Power Supply Cold Start

with all combinations of input voltage, input frequency,

and operating temperature

Shall be able to withstand an ANSI/IEEE C62.41-1980

Power Supply Transient Immunity

6000V 200 ampere ring wave transient test with no

damage

Power Supply Line Surge Immunity

Shall be able to withstand 1.5 times nominal line voltage

for one cycle with no damage

Shall be able to function properly, without reset or visible

Power Supply Missing Cycle Immunity

screen artifacts, when ½ cycle of AC power is randomly

missing at nominal input

The power supply shall not produce audible noise that

would be detectable by the user. Audible shall defined

Power Supply Acoustics

to be in compliance with ISO 7779 (DIN EN27779:1991)

Noise measurements of machines acoustics. Power

Switch noise shall not be considered

Separate 3-prong NEMA 5-15P type plug. Length =

US Type Power Cable

1.8m. Connects to display.

Color = Black

Schuko CEE7-7 type plug.

European Type Power Cable

Length = 1.8m, Connects to display.

Color = Black

Separate 3-prong type plug.

CCC Type Power Cable

Length = 1.8m. Connects to display.

Color = Black

Separate 2-prong NEMA 1-15P type plug. Length =

PSE Type Power Cable

1.8m. Connects to display.

Color = Black

Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption

ON Mode < 35 W (max) / 32 W (typ)

Active Off < 1 W

Recovery Time On Mode = N/A, Active Off < 3 sec

ViewSonic Corporation Confidential

Do Not Copy VX724-1

ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 KHZ

Vertical Refresh Rate 50 – 75 HZ

Maximum Pixel Clock 135 MHz

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes

2 640 x 400 @ 60Hz, 31.5kHz Yes Yes

3 640 x 400 @ 70Hz, 31.5kHz Yes Yes

4 640 x 480 @ 50Hz, 24.7kHz Yes No

5 640 x 480 @ 60Hz, 31.5kHz Yes Yes

6 640 x 480 @ 67Hz, 35.0kHz Yes Yes

7 640 x 480 @ 72Hz, 37.9kHz Yes Yes

8 640 x 480 @ 75Hz, 37.5kHz Yes Yes

9 640 x 480 @ 85Hz, 43.27kHz No No

10 720 x 400 @ 70Hz, 31.5kHz Yes Yes

11 800 x 600 @ 56Hz, 35.1kHz Yes Yes

12 800 x 600 @ 60Hz, 37.9kHz Yes Yes

13 800 x 600 @ 75Hz, 46.9kHz Yes Yes

14 800 x 600 @ 72Hz, 48.1kHz Yes Yes

15 800 x 600 @ 85Hz, 53.7kHz No No

16 832 x 624 @ 75Hz, 49.7kHz Yes Yes

17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes

18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes

20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

21 1024 x 768 @ 85Hz, 68.67kHz No No

22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes

23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes

24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes

25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes

26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Primary Presets

1280x1024 @ 60Hz

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

Changing Modes

- Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Image Adjust” time

- Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto I

mage Adjust”

- The monitor needs to do “Auto Image Adjust” the first time a new mode is detected

(see section “0-Touch™ Function Actions”)

ViewSonic Corporation Confidential

Do Not Copy VX724-1

TFT LCD PANEL

Panel Characteristics:

1st Source Panel

AUO M170EG01 V8 Type TN type with LVDS interface Active Size 337.9 (H) x 270.3 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.264 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom) BACKLIGHT LIFE 50,000 Hours (Typ) / 40,000 Hours (Min) Luminance – Condition:

300 cd/m2 (Typ after 30 minute warm up)

240 cd/m2 (Min after 30 minute warm up) CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity 80% (typ), 75% (min)

MIN LUMINANCE IN 9 POINTS/ MAX

LUMINANCE IN 9 POINTS Contrast Ratio 500:1 (Typ), 300:1 (Min) Color Depth 16 million colors (x bit panel) Viewing Angle (Horizontal) @ CR>10

Typical: 140º

MINIMUM: 120º VIEWING ANGLE (VERTICAL) @ CR>10

Typical: 130º

Minimum: 110º

@ CR>5 Typical: 160º M INIMUM: 140º @ CR>5 Typical: 160º

Minimum: 140º Without OD Board (on/off) Tr = 6ms,Tf = 2ms Total = 8ms (typ) Tr = 9ms,Tf = 4ms Total = 13ms (max)

Response Time

With OD Board (on/ off)

10%-90% @ Ta=25°C

Tr = 3.9ms,Tf = 1.5ms Total = 5.4ms (typ) With OD Board (gray –gray) Total = 4 ms

Panel Defects Please see Panel Quality Specifications.

ViewSonic Corporation Confidential

Do Not Copy

VX724-1

2ND Source Panel

QDI QD17EL0709

Type TN type with LVDS interface Active Size 337.9 (H) x 270.3 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.264 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom) BACKLIGHT LIFE 50,000 Hours (Typ) / 40,000 Hours (Min) Luminance (Center) – Condition:

260 cd/m2 (Typ after 30 minute warm up) 200 cd/m2 (Min after 30 minute warm up)

CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity Dw = 1.25 (typ), 1.33 (max)

dw = Max luminance (of 9 points)/ Min luminance (of 9 points)

Contrast Ratio 500:1 (typ), 300:1 (min) Color Depth 16.2 million colors (6+2 bit panel) Viewing Angle (Horizontal) @ CR>10

Typical: 140º Minimum: 120º

VIEWING ANGLE (VERTICAL) @ CR>10

Typical: 125º Minimum: 105º

@ CR>5

Typical: 160º

Minimum: 140º

@ CR>5

Typical: 145º

Minimum: 125º Without OD Board (on/off) Tr = 2ms,Tf = 6ms Total = 8ms (typ) Total =13ms(max)

Response Time

With OD Board (on/ off)

10%-90% @ Ta=25°C

Tr = 1.4ms,Tf = 5.3ms Total = 6.7ms (typ) With OD Board (gray –gray) Total = 4 ms

Panel Defects Please see Panel Quality Specifications.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

3rd Source Panel

QDI QD17EL0711

270 cd/m2 (Typ after 30 minute warm up) 220 cd/m2 (Min after 30 minute warm up)

CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity Dw = 1.25 (typ), 1.33 (max)

dw = Max luminance (of 9 points)/ Min luminance (of 9 points)

Contrast Ratio 600:1 (typ), 400:1 (min) Color Depth 16.2 million colors (6+2 bit panel) Viewing Angle (Horizontal) @ CR>10

Typical: 140º Minimum: 120º

VIEWING ANGLE (VERTICAL) @ CR>10

Typical: 125º Minimum: 105º

@ CR>5

Typical: 160º

Minimum: 140º

@ CR>5

Typical: 145º

Minimum: 125º Without OD Board (on/off) Tr = 2ms,Tf = 6ms Total = 8ms (typ) Total =13ms(max)

Response Time

With OD Board (on/ off)

10%-90% @ Ta=25°C

Tr = 1.4ms,Tf = 5.3ms Total = 6.7ms (typ) With OD Board (gray –gray) Total = 4 ms

Panel Defects Please see Panel Quality Specifications.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

IMAGE PERFORMANCE

Factory Defaults

Item Defaults Item Defaults

Contrast 70% OSD H. Position 50%

Brightness 100% OSD V. Position 50%

Color Temperature 6500K OSD Time Out 15 Sec

Sharpness 25% OSD Background On

720x400/640x400 720x400 Resolution Notice Enabled

Luminance

Lv (Max) –

Condition:

Same as the Luminance in section

4-7 “TFT LCD PANEL”

Contrast = 100%

Brightness = 100%

Color Temperature = 6500K

Lv (Def) –

Condition:

Contrast = Default

Lv (Def) / Lv (Max) x 100% ≧ 85%

Brightness = Default

Color Temperature = 6500K

Display Size

Horizontal Display Size, Primary Preset Full Screen

Vertical Display Size, Primary Preset Full Screen

Saturation

Contrast = Default

Brightness = Default

No visible saturation

TEST PATTERN = 32-GRAY

Contrast = 100%

Brightness = 100%

6~8 level saturation

Test pattern = 32-gray

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Preset Color Temperatures

SRGB It should meet IEC 61966-2-1 (1999-10) standard

Preset 1 9300K

CCT (Max) = 10250K

CCT (Min) = 8500K

Preset 2 6500K (Primary)

CCT (Max) = 6950K

CCT (Min) = 6100K

Preset 3 5400K

CCT (Max) = 5915K

CCT (Min) = 4935K

Preset Color Temperature

Adjustability

Wx= 0.283 +/- 0.02

Wy= 0.298 +/- 0.02

Wx= 0.313 +/- 0.02

Wy= 0.329 +/- 0.02

Wx= 0.335 +/- 0.02

Wy= 0.350 +/- 0.02

Each color preset shall be adjustable. Red, Green, and Blue shall be

individually controlled.

Video Cards Compatibility

Peaking Performance : Peaking is not adjustable

Raster Artifacts

- Video Artifacts : No visible streaking, sag, or smearing artifacts when driven by the specified video cards in the

primary mode and after user adjustment to best condition

- Power Supply, and Grounding Artifacts : No visible artifacts in any specified video mode within the horizontal or

vertical frequency range of the monitor

- Temperature Drift : Image shall not drift or lose fine-tune adjustment

ViewSonic Corporation Confidential

Do Not Copy VX724-1

MECHANICAL

Dimension (Desktop)

Width 388 mm (15.3 inch)

Height 438 mm (17.2 inch)

Depth 176 mm ( 6.9 inch)

Monitor Weight 5 kg / 11 lbs

Dimension (Head Only / Wall Mount)

Width 388 mm (15.3 inch)

Height 332 mm (13.1 inch)

Depth 62 mm (2.4 inch)

Monitor Weight 3.5 kg / 7.7 lbs

Ergonomics

Tilt Up From 0º up to ≧20º

Tilt Down From 0º down to -3º ~ -5 º

Mechanical Specifications

- Screen Printed Parts : Artwork shall be provided by ViewSonic. The ViewSonic Bezel Graphics Specification,

VSC_S_299 v.1d (2003) controls logo position

- Bird Logo : The ViewSonic Bird Logo Plate Specification, VSC_S_286 v.1b controls bird logo position

- Molded Plastic : Workmanship shall be inspected according to the ViewSonic Molded Plastic Parts Specification,

VSCMPPSPEC001 v.1b

- Head Tilt Specification : In order to control the visible tilt of the LCD head, all units must have less than 1.5mm

difference in height between the lower center and left / right corner of the bezel

- Bezel Gap Specification: The max. gap to the panel glass shall be less than 1.0 mm

- Bezel / Speaker Cover Gap : The max. gap between the bottom of the front bezel and the top of the speaker cover

shall be less than 1.2 mm. The gap deviation must be less than 0.3mm

- External Jumpers : There shall be no external jumpers allowed

- Panel Preload Pressure :The LCD panel shall not experience any preload pressure when mounted to the bezel

causing image degradation

- Front Panel Buttons : Tactile

- Button Alignment : The gap clearance between the buttons and the bezel surface shall be uniform

- Cold Cathode Fluorescent Tubes (CCFT) Cables : Cables between inverter and CCFT shall not have any direct

contact to any cabinet surface or opening exposing users to the risk of electric shock. CCFT cables shall be

properly routed internally to prevent them from straying to other areas within the monitor

- Sheet Metal Parts : All sharp edges of sheet metal parts that have the possibility of coming into contact with wire

harnesses, flexible flat cables (FFCs), CCFT cables shall be covered with felt tape to protect the cable’s insulation

from being damaged. If felt tape is not used, then the edges of the sheet metal shall be machined smooth to prevent

wiring insulator damage

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Tilt/Swivel Base Mechanical Interface

The LCD monitor shall be in compliance with the most current revision of the VESA “Flat Panel Monitor Physical

Mounting Interface” Standard, “FPMPMI Standard”

PACKAGING

Package Specifications

ViewSonic Packaging Specification The “Top Level Assembly” shall meet the ViewSonic Corporation

Packaging Specification, VSCPACSPEC003

Ink The ink shall not rub off after a suitable drying time.

Multiple Trips

The carton shall withstand 10 trips by any combination of air, rail,

land, or sea transportation.

Shipping Carton Type One piece construction with double wall, 1.08 Kg

Shipping Carton Handholds Yes, on side of carton

Poly form EPS, 210g

Accessory plastic bags PE-LD, 3 g

Plastic handle PE-plastic, 20g (on the top side of carton)

PE bag (covers monitor) PE-LD, 5 g

Width / Height / Depth 456mm (17.9”) / 529mm (20.8”) / 227mm (8.9”)

Gross Weight 7 kg (15.4 lb)

Pallet (for Europe) Poplar, 21 Kg

Pallet (for others) Fumigation wood, 21 Kg

# units per Pallet 20/40 (air/sea)

40’ Container Loading, Palletized 1040 pieces

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Vibration Test

- Vibration Frequency : 1 – 200 Hz

- Acceleration : 1.14 G RMS

- Sweep Time : 1 oct. / min

- Test Time : 60 min per axis, total 3 axis / 6 main face

-Vibration Test Data shall be submitted for approval to ViewSonic before Mass Production

Drop Test (100G)

- Weak Corner : 76.2 cm

- Six Faces : 76.2 cm

- 3 Edges Radiating From Weak Corner : 76.2 cm

- Drop Test Data shall be submitted for approval to ViewSonic before Mass Production

ENVIRONMENTAL

- Operating Temperature : 0°C to +40°C

- Storage Temperature : -20°C to +60°C

- Operating Relative Humidity : 20% to 90% RH Non-Condensing

- Storage Relative Humidity : 5% to 90% RH Non-Condensing

- Operating Altitude : 0 to +3,000 meters

-Storage Altitude : 0 to +12,000 meters

ViewSonic Corporation Confidential

Do Not Copy VX724-1

3. Front Panel Function Control Description

Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls” on page 17.

Main Menu

with OSD controls

Front Control Panel

shown below in detail

Displays the Main

Menu or exits the

control screen

and saves

adjustments.

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle analog and digital connection.

Power light Green = ON Orange = Power Saving

Power On/Off

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Do the following to adjust the display setting:

1. To display the Main Menu, press button [1].

NOTE: All OSD menus and adjustment screens disappear automatically after about 30

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu.

3. After the desired control is selected, press button [2]. A control screen like the one shown

below appears.

The line at the bottom of the screen shows the current functions of buttons 1 and 2: Exit or select the Brightness control.

4. To adjust the setting, press the upSor downTbuttons.

5. To save the adjustments and exit the menu, press button [1] twice.

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1280 x 1024 @ 60Hz video signal to the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's user guide.)

• If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible. (The black border around the edge of the screen should barely touch the illuminated “active area” of the LCD display.)

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Main Menu Controls

Adjust the menu items shown below by using the upSand downTbuttons.

Control Explanation

Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image.

NOTE:

1. Auto Image Adjust works with most common video cards. If this function

does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.

2. The Auto Image Adjust and most Manual Image Adjust functions are not available for DVI input.

Contrast adjusts the difference between the image background (black level) and the foreground (white level).

Brightness adjusts background black level of the screen image.

Input Select allows you to toggle between an analog and a digital signal.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the sRGB setting will cause the Contrast and Brightness adjustments to be disabled.

9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting).

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Control Explanation

6500K-Adds red to the screen image for warmer white and richer red.

5400K-Adds green to the screen image for a darker color.

User Color Individual adjustments for red (R), green (G), and blue (B).

1. To select color (R, G or B) press button [2].

2. To adjust selected color, pressSorT.

Important: If you select RECALL from the Main Menu when the product is set

to a Preset Timing Mode, colors return to the 6500K factory preset.

Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

NOTE: VESA 1280 x 1024 @ 60Hz (recommended) means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust displays the Manual Image Adjust menu.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Control Explanation

The Manual Image Adjust controls are explained below:

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

H. Size (Horizontal Size) adjusts the width of the screen image.

Fine Tune sharpens the focus by aligning the text and/or graphic characters

with pixel boundaries.

Sharpness adjusts the clarity and focus of the screen image.

Setup menu displays the menu shown below:

The Setup Menu controls are explained below:

Language select allows the user to choose the language used in the menus and

control screens.

Resolution Notice displays the Resolution Notice menu shown below.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the on-screen display menus and control

screens.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

Control Explanation

OSD Timeout sets the length of time the on-screen display screen is displayed. For example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears.

OSD Background allows the user to turn the On-Screen Display background On or Off.

Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual.

Exception: This control does not affect changes made with the User Color control, Language or Power Lock setting.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

4. Circuit Description

1. Outline

1.1 Buttons on the front panel: Power On/Off button, button 2 (ENTER / INPUT SELECT), up arrow

button, down arrow button, button 1 (MENU).

1.2

The D-sub 15-pin connector, DVI-I connector and AC-IN jack are located on the back side of the cabinet.

1.3 The OSD menu includes the following functions:

Auto Image Adjust (only active under analog input)

Contrast/Brightness

Audio Adjust

Color Adjust

Information

Manual Image Adjust

Setup Menu

Memory Recall

1.4

Contrast and Brightness can be directly controlled with the UP / DOWN buttons.

2. Connectors

AC Socket: CEE22 type connector

2.1

2.2 Video signal connector for analog input: 15P Mini D-Sub

CN6

DB15HD

PIN MNEMONIC SIGNAL

1 RV Red Video

2 GV Green Video

3 BV Blue Video

4 NC None

5 GND Ground(DDC return)

6 RG Red GND

7 GG Green GND

8 BG Blue GND

9 +5V +5V (for DDC)

10 SG Sync GND

11 NC None

12 SDA DDC Data

13 HS Horizontal Sync

14 VS Vertical Sync

15 SCL DDC Clock

ViewSonic Corporation Confidential

Do Not Copy

VX724-1

2.3

Video signal connector for digital input: 24pin DVI-D connector

CN9

RX2-

RX2+

GND

RX4-

RX4+

SCL

SDA

RX1-

RX1+

GND

RX3-

RX3+

GND

RX0-

RX0+

GND

RX5-

RX5+

GND

RXC+

RXC-

3. Electrical Specifications

DVI-D

3.1 Standard conditions

Pin No. Signal Name Description

1 RX2- TMDS negative differential input, channel 2

2 RX2+ TMDS positive differential input, channel 2

3 GND Logic Ground

4 RX4- Reserved. No connection

5 RX4+ Reserved. No connection

6 SCL DDC2B Clock

7 SDA DDC2B Data

8 VS Reserved. No connection

9 RX1- TMDS negative differential input, channel 1

10 RX1+ TMDS positive differential input, channel 1

11 GND Logic Ground

12 RX3- Reserved. No connection

13 RX3+ Reserved. No connection

14 +5V Power

15 GND Logic Ground

16 HP SENSE Pin, Pull High

17 RX0- TMDS negative differential input, channel 0

18 RX0+ TMDS positive differential input, channel 0

19 GND Logic Ground

20 RX5- Reserved. No connection

21 RX5+ Reserved. No connection

22 GND Logic Ground

23 RXC+ TMDS positive differential input, reference clock

24 RXC- TMDS negative differential input, reference clock

Display Area

Video Signal

Contrast

Brightness

Ambient

Input

Warming up

Display

404.2 x 330.0 mm

0.7Vpp

Max.

20 +/- 5 °C

> 30 min

1280 x 1024

ViewSonic Corporation Confidential

Do Not Copy

VX724-1

3.2 Power

3.2.1 Power supply

Input voltage 100~240Vac

Power frequency 50~60Hz

Input current

Inrush current

Power consumption 35W(typical);40Watts(Max)

3.2.2 Power Management

State Power Indicator

On 35Watts Green

Standby < 1Watts Amber

Off <1Watts Off

<1.5A RMS @90V AC

<0.8A RMS @180V AC

50A(Max) at 120Vac(cold start)

3.3 Acceptable timing

This LCD display can automatically detect and display input signals whose timing falls within the

following limits.

Horizontal: Sync frequency: 30~82 kHz

Vertical: Sync frequency: 56~75Hz

3.4 Signal level and input impedance

3.4.1 Video signal level: 0.7Vp-p

3.4.2 Sync signal level - H/V separate: TTL level

3.4.3 Input impedance

Analog video input: 75 ohm

Digital video input: 100 ohm

Sync input: > 1 k ohm

Audio input: 10K ohm

4. Signal Cable: Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.

ViewSonic Corporation Confidential

Do Not Copy VX724-1

+ 65 hidden pages