ViewSonic VX922-1 User Manual

Service Manual

ViewSonic VX922-1

Model No. VS10162

19” Color TFT LCD Display

(VX922-1_SM Rev. 1c Nov. 2006)

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

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.

Revision History

ECR Number

1c 11/28/06 VS-E060423 Scaler change (updated RSPL/BOM and added EDID update method) Jamie Chang

12/26/05

04/12/06

VS-E060143

Initial Release

Add new panel "HSD D10" (changed RSPL / BOM / EPL) Jamie Chang

Description of Changes

EditorRevision SM Editing Date

Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 5

3. Front Panel Function Control Description 12

4. Circuit Description 18

5. Adjustment Procedure 28

6. Troubleshooting Flow Chart 78

7. Recommended Spare Parts List 84

8. Exploded Diagram and Exploded Parts List 86

9. Block Diagram 89

10. Schematic Diagrams 91

11. PCB Layout Diagrams 100

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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.

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(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.

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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."

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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.

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2. Specification

Test

Resolution

Frequency

280x1

024 @

60Hz

Test

age Size

Full Size

for five

GENERAL specification

Contrast and Brightness Controls

VIDEO INTERFACE

Analog Input Connector Digital Input Connector Default Input Connector

Video Cable Strain Relief

Video Cable Connector DB-15 Pin out

Video Signals

Video Impedance Maximum PC Video Signal Maximum Mac Video Signal Sync Signals DDC 1/2B Sync Compatibility

Video Compatibility

Resolution Compatibility

Exclusions

Factory Default: Contrast = 70%, Brightness = 100%

DB-15 (Analog), refer the appendix A DVI-I (Digital), refer the appendix B Defaults to the first detected input Equal to twice the weight of the monitor minutes Compliant DDC 1/2B

1. Video RGB (Analog) Separate, Composite, and Sync on Green

2. TMDS (Digital) 75 Ohms (Analog), 100 Ohms (Digital) 950 mV with no damage to monitor 1250 mV with no damage to monitor LVDS Compliant with Revision 1.3 Separate Sync, Composite Sync, SOG Shall be compatible with all PC type

computers, Macintosh computers, and after market

640 (640 1024 1152 x 864, 1152 x 870, 1280 x 720, 1280 x 960, 1280 x 1024

* The image vertical size might not be full screen. But the image vertical position should be at the center.

Not compatible with interlaced video

x400*),

350*,

video cards

640

800

768,

480,

720

400*

600,

832

624,

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POWER SUPPLY

Internal Power Supply Input Voltage Range Input Frequency Range Short Circuit Protection

Over Current Protection

Leakage Current EFFICIENCY Fuse Power Dissipation Max Input AC Current INRUSH CURRENT (COLD START)

Power Supply Cold Start

Power Supply Transient Immunity

Power Supply Line Surge Immunity

Power Supply Missing Cycle Immunity

Power Supply Acoustics

US Type Power Cable

European Type Power Cable

CCC Type Power Cable

PSE Type Power Cable

Power Saving Operation(Method)

Power Consumption

Recovery Time

Part Number: FSP035-1PI01 90 TO 264 VAC

47.5 TO 63 HERTZ Output can be shorted without damage

3.5 A typical at 12.0 VDC ( Protect when short circuit )

0.75mA (Max) at 264VAC / 50Hz 77 % typical at 115VAC Full Load Internal and not user replaceable 35 Watts (typ)

1.2 Arms @ 90VAC, 0.7 Arms @265VAC 60 A @ 115VAC Shall start and function properly when under full load, with all combinations of

input voltage, input frequency, and operating temperature Shall be able to withstand an ANSI/IEEE C62.41-1980 2000V 200 ampere ring wave transient test with no damage

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 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 define 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 = 1.8m. Connects to display. Color = Black Schuko CEE7-7 type plug. Length = 1.8m, Connects to display. Color = Black Separate 3-prong type plug. Length = 1.8m. Connects to display. Color = Black Separate 2-prong NEMA 1-15P type plug. Length = 1.8m. Connects to display. Color = Black VESA DPMS Signaling ON Mode < 40 W (Max) / 38 W (Typ) On Mode < 40 W (Max) / 38W (Typ) Saving Mode < 2 W, Off Mode < 1 W On Mode = N/A, Active Off < 3 sec

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Horizontal

Frequency

30 – 82

KHZ

Maximum

xel Clock

135

MHz

ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Vertical Refresh Rate

Sync Polarity

Timing Table

Item

1 2 3 4 5 6 7 8

9 10 11 800 x 600 @ 56Hz, 35.1kHz 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Primary Presets

1280x1024 @ 60Hz

640 x 350 @ 70Hz, 31.5kHz 640 x 400 @ 60Hz, 31.5kHz 640 x 400 @ 70Hz, 31.5kHz 640 x 480 @ 50Hz, 24.7kHz 640 x 480 @ 60Hz, 31.5kHz 640 x 480 @ 67Hz, 35.0kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz

800 x 600 @ 60Hz, 37.9kHz 800 x 600 @ 75Hz, 46.9kHz 800 x 600 @ 72Hz, 48.1kHz 800 x 600 @ 85Hz, 53.7kHz 832 x 624 @ 75Hz, 49.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 70Hz, 56.5kHz 1024 x 768 @ 72Hz, 58.1kHz 1024 x 768 @ 75Hz, 60.0kHz 1024 x 768 @ 85Hz, 68.67kHz 1152 x 864 @ 75Hz, 67.5kHz 1152 x 870 @ 75Hz, 68.7kHz 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280x 720 @ 60Hz, 45kHz (HDTV)

Timing

50 – 75 HZ

Independent of sync polarity.

User Presets

Number of User Presets (recognized timings) Available: 10 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),

setting when execute “ Auto Image Adjust”

●

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

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

Analog

Yes Yes Yes Yes Yes Yes Yes Yes

No Yes Yes Yes Yes Yes

Digital

presets total in FIFO

should recall factory

Yes Yes Yes

No Yes Yes Yes Yes

No Yes Yes Yes Yes Yes

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Panel Characteristics:

1st Source Panel

Model number CPT CLAA190EA05Q Type TN type with LVDS interface Active Size 372 (H) x 302 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.294 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom) BACKLIGHT LIFE 40,000 Hours (Min) Luminance (5-point) – Condition:

250 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

≧70% Entire Area (min)

Contrast Ratio 650:1 (typ), 560:1 (min) Color Depth 16.2 million colors (6 bits + 2 bits FRC) Viewing Angle (Horizontal) @ CR>10

Typical: 150º

Minimum: 140º

@ CR>5

Typical: 170º

Minimum: 160º

Viewing Angle (Vertical) @ CR>10

Typical: 135º

Minimum: 125º

@ CR>5

Typical: 170º

Minimum: 160º

Without OD Function (on/off)

6ms (typ)

Response Time 10%-90% @ Ta=25°C

12ms(max)

With OD Board (on/ off)

Tr =T.B.D ms,Tf =T.B.D ms Total =T.B.D ms (typ)

With OD Function (gray –gray)

One-way (Average of Tr and Tf) = 2 ms (typ) Panel Defects Please see Panel Quality Specifications.

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2nd Source Panel

Model number HSD HSD190ME13-D10 Type TN type with LVDS interface Active Size 376.32 (H) x 301.06 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.294 mm GLASS TREATMENT Anti Glare (Hard coating 3H) # OF BACKLIGHTS 4 CCFL edge-light (2 top / 2 bottom) BACKLIGHT LIFE 40,000 Hours (Min) Luminance (5-point) – 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

≧70% Entire Area (min)

Contrast Ratio 700:1 (typ), 450:1 (min) Color Depth 16.2 million colors (6 bits + 2 bits FRC) Viewing Angle (Horizontal) @ CR>10

Typical: 150º

Minimum: 130º Viewing Angle (Vertical) @ CR>10

Typical: 135º

MINIMUM: 115º

Without OD Function (on/off)

Response Time 10%-90% @ Ta=25°C

Tr+Tf =5 ms (typ)

With OD Function

(Gray –Gray Average) = 2 ms (typ) Panel Defects Please see Panel Quality Specifications.

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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 33% 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 = 64-Gray Contrast = 100% Brightness = 100%

6 – 8 level saturation (Max)

Test Pattern = 64-Gray

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Preset Color Temperatures

SRGB It should meet IEC 61966-2-1 (1999-10) standard Preset 1 9300K Wx= 0.283+/- 0.015, Wy= 0.298+/- 0.015

Preset 2 6500K (Primary) Wx= 0.313+/- 0.015, Wy= 0.329+/- 0.015

Preset 3 5400K Wx= 0.335+/- 0.015, Wy= 0.350+/- 0.015

Preset Color Temperature Adjustability

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

MECHANICAL

Dimension (Desktop)

Width 431 mm (17 inch) Height 468 mm (18.4 inch) Depth 201 mm (7.9 inch) Monitor Weight 6.7 Kg (14.8 lbs)

Dimension (Head Only / Wall Mount) Width 431 mm (17 inch) Height 370 mm (14.6 inch) Depth 66 mm (2.6 inch) Monitor Weight 5.3 Kg (11.7 lbs)

Ergonomics

Tilt Up Tilt Down

From 0º up to ≧20º

From 0º down to -3º ~ -5º

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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 13.

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

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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 setting to be adjusted, pressSorTto scroll up or down 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 tells you what you can do next: 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 your 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 your graphic 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.)

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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.

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: preset color

temperatures and User Color which allows you to adjust red (R), green (G), and blue (B) separately. The factory setting for this product is 6500K (6500 Kelvin).

sRGB-sRGB 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).

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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 your 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.

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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.

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 allows you 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 you to move the on-screen display menus and control

screens.

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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 you 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.

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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

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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.

Max. 20 +/- 5 °C

> 30 min

1280 x 1024

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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.

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5. EDID data

AUO

Analog EDID

128 BYTES OF EDID CODE:

0 1 2 3 4 5 6 7 8 9

________________________________________

0 | 00 FF FF FF FF FF FF 00 5A 63

10 | 1C 0F 01 01 01 01 01 0F 01 03

20 | 0E 26 1E 78 2E 68 75 A2 5A 49

30 | 9F 23 13 50 54 BF EF 80 81 80

40 | 71 4F 61 59 45 59 31 59 01 01

50 | 01 01 01 01 30 2A 00 98 51 00

60 | 2A 40 30 70 13 00 78 2D 11 00

70 | 00 1E 00 00 00 FF 00 50 53 33

80 | 30 35 30 31 30 30 30 30 31 0A

90 | 00 00 00 FD 00 32 55 1E 52 0E

100 | 00 0A 20 20 20 20 20 20 00 00

110 | 00 FC 00 56 58 39 32 34 0A 20

120 | 20 20 20 20 20 20 00 D3 __________ _______________________________________

(08-09) ID Manufacturer Name = VSC

(11-10) P roduct ID Code = 0F1C

(12-15) Last 5 Digits of Serial Number = Not Used

(16) Week of Manufacture = 01

(17) Year of Manufacture = 2005

(10-17) Complete Serial Number = See Descriptor Block

(18) EDID Version Number = 1

(19) EDID Revision Number = 3

(20) VIDEO INPUT DEFINITION:

Analog Signal

0.700, 0.300 (1.000 Vp-p)

Separate Syncs, Composite Sync, Sync on Green

(21) Maximum Horizontal Image Size = 380 mm

(22) Maximum Vertical Image Size = 300 mm

(23) Display Gamma = 2.20

(24) Power Management and Supported Feature(s):

Active Off/Very Low Power, Standard Default Color Space,

Preferred Timing Mode

Display Type = R/G/B Color

(25-34) CHROMA INFO:

Red X - 0.634 Green X - 0.287 Blue X - 0.138 White X - 0.313

Red Y - 0.354 Green Y - 0.621 Blue Y - 0.077 White Y - 0.329

(35) ESTABLISHED TIMING I:

720 X 400 @ 70Hz (IBM,VGA)

640 X 480 @ 60Hz (IBM,VGA)

640 X 480 @ 67Hz (Apple,Mac II)

640 X 480 @ 72Hz (VESA)

640 X 480 @ 75Hz (VESA)

800 X 600 @ 56Hz (VESA)

800 X 600 @ 60Hz (VESA)

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(36) ESTABLISHED TIMING II:

800 X 600 @ 72Hz (VESA)

800 X 600 @ 75Hz (VESA)

832 X 624 @ 75Hz (Apple,Mac II)

1024 X 768 @ 60Hz (VESA)

1024 X 768 @ 70Hz (VESA)

1024 X 768 @ 75Hz (VESA)

1280 X 1024 @ 75Hz (VESA)

(37) Manufacturer's Reserved Timing:

1152 X 870 @ 75Hz (Apple,Mac II)

(38-53) Standard Timing Identification:

1280 X 1024 @60Hz

1152 X 864 @75Hz

1024 X 768 @85Hz

800 X 600 @85Hz

640 X 480 @85Hz

Not Used

Not Used ______________________________________________________________________

(54-71) Detailed Timing / Descriptor Block 1:

______________________________________________________________________

Horizontal:

Vertical:

Digital Separate, Horizontal Polarity (+) Vertical Polarity (+) ______________________________________________________________________

(72-89) Detailed Timing / Descriptor Block 2:

Monitor Serial Number:

PS3050100001 ______________________________________________________________________

(90-107) Detailed Timing / Descriptor Block 3:

______________________________________________________________________

(108-125) Detailed Timing / Descriptor Block 4:

Monitor Name:

(126) No Extension EDID Block(s)

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(127) CheckSum OK

1280x1024 Pixel Clock: 108.00 MHz

Horizontal Image Size: 376 mm Vertical Image Size: 301 mm

Refreshed Mode: Non-Interlaced Normal Display - No Stereo

Active Time: 1280 pixels Blanking Time: 408 pixels

Sync Offset: 48 pixels Sync Pulse Width: 112 pixels

Border: 0 pixels Frequency: 63.98 KHz

Active Time: 1024 lines Blanking Time: 42 lines

Sync Offset: 1 lines Sync Pulse Width: 3 lines

Border: 0 lines Frequency: 60.02 Hz

Monitor Range Limits:

Min Vertical Freq - 50 Hz

Max Vertical Freq - 85 Hz

Min Horiz. Freq - 30 KHz

Max Horiz. Freq - 82 KHz

Pixel Clock - 140 MHz

Secondary GTF - Not Supported

VX924

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Digital EDID

128 BYTES OF EDID CODE:

0 1 2 3 4 5 6 7 8 9

________________________________________

0 | 00 FF FF FF FF FF FF 00 5A 63

10 | 1C 0F 01 01 01 01 01 0F 01 03

20 | 80 26 1E 78 2E 68 75 A2 5A 49

30 | 9F 23 13 50 54 BF EF 80 81 80

40 | 71 4F 61 59 45 59 31 59 31 0A

50 | 01 01 01 01 30 2A 00 98 51 00

60 | 2A 40 30 70 13 00 78 2D 11 00

70 | 00 1E 00 00 00 FF 00 50 53 33

80 | 30 35 30 31 30 30 30 30 31 0A

90 | 00 00 00 FD 00 32 55 1E 52 0E

100 | 00 0A 20 20 20 20 20 20 00 00

110 | 00 FC 00 56 58 39 32 34 0A 20

120 | 20 20 20 20 20 20 00 28

_________________________________________________

(08-09) ID Manufacturer Name = VSC

(11-10) Product ID Code = 0F1C

(12-15) Last 5 Digits of Serial Number = Not Used

(16) Week of Manufacture = 01

(17) Year of Manufacture = 2005

(10-17) Complete Serial Number = See Descriptor Block

(18) EDID Version Number = 1

(19) EDID Revision Number = 3

(20) VIDEO INPUT DEFINITION:

Digital Signal

Non - VESA DFP 1.x Compatible

(21) Maximum Horizontal Image Size = 380 mm

(22) Maximum Vertical Image Size = 300 mm

(23) Display Gamma = 2.20

(24) Power Management and Supported Feature(s):

Active Off/Very Low Power, Standard Default Color Space,

Preferred Timing Mode

Display Type = R/G/B Color

(25-34) CHROMA INFO:

Red X - 0.634 Green X - 0.287 Blue X - 0.138 White X - 0.313

Red Y - 0.354 Green Y - 0.621 Blue Y - 0.077 White Y - 0.329

(35) ESTABLISHED TIMING I:

720 X 400 @ 70Hz (IBM,VGA)

640 X 480 @ 60Hz (IBM,VGA)

640 X 480 @ 67Hz (Apple,Mac II)

640 X 480 @ 72Hz (VESA)

640 X 480 @ 75Hz (VESA)

800 X 600 @ 56Hz (VESA)

800 X 600 @ 60Hz (VESA)

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(36) ESTABLISHED TIMING II:

800 X 600 @ 72Hz (VESA)

800 X 600 @ 75Hz (VESA)

832 X 624 @ 75Hz (Apple,Mac II)

1024 X 768 @ 60Hz (VESA)

1024 X 768 @ 70Hz (VESA)

1024 X 768 @ 75Hz (VESA)

1280 X 1024 @ 75Hz (VESA)

(37) Manufacturer's Reserved Timing:

1152 X 870 @ 75Hz (Apple,Mac II)

(38-53) Standard Timing Identification:

1280 X 1024 @60Hz

1152 X 864 @75Hz

1024 X 768 @85Hz

800 X 600 @85Hz

640 X 480 @85Hz

640 X 400 @70Hz

Not Used

Not Used ______________________________________________________________________

(54-71) Detailed Timing / Descriptor Block 1:

______________________________________________________________________

Horizontal Image Size: 376 mm Vertical Image Size: 301 mm

Refreshed Mode: Non-Interlaced Normal Display - No Stereo

Horizontal:

Vertical:

Digital Separate, Horizontal Polarity (+) Vertical Polarity (+)

______________________________________________________________________

(72-89) Detailed Timing / Descriptor Block 2:

______________________________________________________________________

(90-107) Detailed Timing / Descriptor Block 3:

______________________________________________________________________

(108-125) Detailed Timing / Descriptor Block 4:

Monitor Name:

(126) No Extension EDID Block(s)

(127) CheckSum OK

1280x1024 Pixel Clock: 108.00 MHz

Active Time: 1280 pixels Blanking Time: 408 pixels

Sync Offset: 48 pixels Sync Pulse Width: 112 pixels

Border: 0 pixels Frequency: 63.98 KHz

Active Time: 1024 lines Blanking Time: 42 lines

Sync Offset: 1 lines Sync Pulse Width: 3 lines

Border: 0 lines Frequency: 60.02 Hz

Monitor Serial Number:

PS3050100001

Monitor Range Limits:

Min Vertical Freq - 50 Hz

Max Vertical Freq - 85 Hz

Min Horiz. Freq - 30 KHz

Max Horiz. Freq - 82 KHz

Pixel Clock - 140 MHz

Secondary GTF - Not Supported

VX924

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6. THEORY OF OPERATION

This section describes the function of the LCD monitor per functional block.

This monitor includes MB board, power board and button board.

6.1 MB BOARD

The MB board is a two-layer, single-grounded design with ground and internal planes provided. DC power from

the power board enters the board through a 6P connector. The other connector on the board is for the button board.

The VGA cable is a signal cable that carries the video, sync and DDC signals from the PC VGA adapter. This

system board consists of 4 functional areas: flat panel controller, MCU with flash ROM, and power regulators.

6.1.1 Flat panel controller: RTD2523(U7)

The heart of the system board is the Realtek RTD2523. The RTD2523 is a graphics processing IC

designed for LCD monitors. It provides all key IC functions required for LCD displays. On-chip

functions include a high-speed triple-ADC, PLL, high scaling engine and OSD controller.

a) Clock Generation:

Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and

corresponding logic. A 24.576 MHz crystal is recommended.

b) Analog to Digital Converter:

The RTD2523 chip has three ADCs (analog-to-digital converters), one for each color (red, green and blue).

The analog RGB signals are connected to RTD2523 as described below.

Pin Name Pin Number Red + 37 Red - 38 Green + 34 Green - 35 Blue + 30

Blue - 31

c) OSD: The RTD2523 has a fully programmable, high-quality OSD controller. The on-chip static

RAM (4096 words by 24 bits) stores the cell map and the cell definitions.

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d) MTV312 Micro Controller: The MTV312 micro controller (MCU) serves as the system micro controller.

It programs the RTD2523 and manages other devices in the system such as the keypad, the backlight, the

LED, the audio system and the non-volatile RAM using general purpose input/output (GPIO) pins.

Pin number Pin Name Pin Usage

1 P5.2 Key / Power on, off

13 P3.4 NV_RAM (U4) SDA

14 P3.5 NV_RAM (U4) SCL

41 P5.4 Key_down

40 P5.5 Key_right

42 P5.3 Key_up

34 P5.6 Key_left

9 P6.3 Key_mute

2 P5.1 Key_select

27 P6.0 LED_red

26 P6.1 LED_green

16 P6.2 LCD panel power1 on / off control

17 P1.0 Backlight on / off control

e) Panel Power Sequencing (PANEL_PW12,3) (Pin 16, 18): The MTV312 has two dedicated outputs

VDDCTRL1 and 2 ( Pin32 and Pin3) to control LCD power sequencing once data and control signals

are stable.

f) Panel interface (Pin73~94): The RTD2523 driver interface is highly programmable. It supports dual bus /

dual port for SXGA drivers.

6.1.2 Power Regulator AIC1563 (U2), AIC1117CY (U1,U3): The AIC1563 is a monolithic control IC

containing the primary functions required for DC to DC converters. The device consists of an internal temperature

compensated reference, a comparator, and a controlled duty cycle oscillator with an active current

sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 (1 + R11 / R12).

In this case, the output voltage is 5 Volts. The AIC1563 is a low dropout positive adjustable

regulator with minimum of 1A output current capability, so it is well suited to serve as a 3.3 V or

2.5 V regulator.

6.1.3 Power Regulator AIC1117CY (U1,U3): The AIC1117CY is a monolithic control IC containing the

primary functions required for DC to DC converters. The device consists of an internal temperature

compensated reference, a comparator, and a controlled duty cycle oscillator with an active current

sense circuit. The desired output voltage is determined by the equation, Volt = 1.25 (1 + R17 / R15).

In this case, the output voltage is 2.5 Volts for panel power.

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6.2 Power (Inverter) Board

This is a specific power (inverter) board for VX912 monitor with output of 40W / 12V / 3.5A. It provides

12 VDC to drive the four cold cathode fluorescence tubes in the backlight.

6.2.1 The inverter's electrical specification is described below.

Input

Output

6.2.2 Power

This is a general purpose AC / DC adapter which converts 90~240 Vac to a stabilized DC voltage: 12

Volts, with a rated output current of 4.16A. The electrical specification is described below.

Rated Input Voltage 12Vdc

Input Voltage Range 11.4 ~ 12.6 Vdc

Input Current <2A

On / Off control Voltage 2~3.3 for on, 0~1 for off

Rated Output Strike-on Voltage 1500Vrms

Rated Output Voltage 710Vrms at 7mA

Rate Output Frequency 40~50KHz

Rated Output Current 7~8 mA

Rated Input Voltage 90~240 Vac, 50 / 60Hz

Operation Input Voltage 90~260 Vac, 47 ~ 63Hz

Input Current <1.5A

Inrush Current <100A@120Vac

Standby Input Voltage 12Vdc

Output Voltage Regulation +/-5%

Output Ripple & Noise 120mVp-p

Rate Output Current <3.5A

Turn-on delay <3secs

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+ 74 hidden pages

ViewSonic VX922-1 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contrast/Brightness

Color Adjust

Information

Manual Image Adjust