ViewSonic vx912-1 Service Manual

Model No. VS10162

19” Color TFT LCD Display

Service Manual

ViewSonic VX912-1

ViewSonic



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

(VX912_SM_836 Rev. 1a Oct. 2004)

2004 by ViewSonic Corporation. All rights reserved. No part of this publication may be 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

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

Optiquest is a registered trademark of ViewSonic Corporation.

Revision History

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DCN Number ECR Number

Documents Number

Description of Changes EditorRevision SM Editing Date

10/15/0

4460

Initial Release

A. Lu

TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Trouble Shooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjusting Procedure

8. Exploded Diagram And Spare Parts List

11. PCB Layout Diagrams

1 5 9

43 45

47 57 60

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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 high quality and safety approved AC/DC power cord. (5) Disconnect the power plug from AC outlet if the product is not 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 susceptible to excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- Place 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 inserting or disconnecting from input connector. (3) Wipe off water drop 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 insure human earth when handling. (7) Do not open nor modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module to any directions. (9) In case if a Module has to be put back into the packing container slot after once it was taken out from 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 nor tilt the Interface

Connector of the TFT Module.

1. Precautions and Safety Notices

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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist nor

bend the TFT Module even momentary. At designing the enclosure, it should be taken into consideration that

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

damaged.

(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances or

regulations for disposal.

(13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module should

be supplied by power complied with requirements of Limited Power Source (IEC60950 or UL1950), or be

applied exemption.

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

UL1950). Do not connect the CFL in 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 .

Surface of the panel is pressed by fingers & this may cause “ MURA “

Take out the monitor with cushion Take out the monitor 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 . Place the monitor on foreign objects .

That could scratch the surface of panel

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l GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

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

l 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 1/2B

Video Signals

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

2. TMDS (Digital) 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 Sync Signals LVDS DDC 1/2B Compliant with Revision 1.3 Sync Compatibility Separate Sync, Composite Sync, SOG

Video Compatibility

Shall be compatible with all PC type computers, Macintosh computers, and after market video cards

Resolution Compatibility

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 960, 1280 x 1024

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

Exclusions Not compatible with interlaced video

l 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 3.5 A typical at 12.0 VDC ( Protect when short circuit ) Leakage Current 0.75mA (Max) at 264VAC / 50Hz EFFICIENCY 77 % typical at 115VAC Full Load Fuse Internal and not user replaceable Power Dissipation 35 Watts (typ) Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @265VAC

2. Specification

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l ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 24 – 82 KHZ Vertical Refresh Rate 50 – 85* HZ.

* FOR RESOLUTION 1280 X 1024, THE VERTICAL

REFRESH RATE UP TO 75 HZ; FOR THE REST OF RESOLUTIONS, THE VERTICAL REFRESH RATE

TO 85HZ

Maximum Pixel Clock 135 MHz Sync Polarity Independent of sync polarity.

l 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 Yes 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 Yes Yes 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 Yes Yes 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 Yes Yes 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

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l TFT LCD PANEL

Source Panel

Model number LPL LM190E03 B4N2/B4N4 Type TN type with LVDS interface Active Size 376.3 (H) x 301.1 (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 50,000 Hours (Min) Luminance (5-point) – Condition: CT = 6500K, Contrast = Max, Brightness = Max

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

Brightness Uniformity ≧77% % Entire Area Contrast Ratio 500:1 (typ), 300:1 (min) Color Depth 16.2 million colors (6 bits + 2 bits FRC) Viewing Angle (Horizontal) @ CR>10

Typical: 140º (±70º) Minimum: 120º (±60º)

@ CR>5 Typical: 160º (±80º) Minimum: 140º (±70º)

VIEWING ANGLE (VERTICAL) @ CR>10

Typical: 140º (±70º) Minimum: 120º (±60º) @ CR>5 Typical: 160º (±80º) MINIMUN: 140º (±70º)

Response Time 10%-90% @ Ta=25°C

12 ms (Tr= 2 ms, Tf = 10 ms) (typ) 25 ms (Tr= 5 ms, Tf = 20 ms) (max)

Panel Defects Please see Panel Quality Specifications.

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l 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 From 0º up to ≧20º Tilt Down From 0º down to -3º ~ -5 º

l 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

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Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OnView® controls which display on the screen. The OnView controls are explained at the top of the next page.

Front Control Panel shown below in detail

Main Menu With OnView controls

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

Power On/Off

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle between analog and digital connections.

Power light Green = ON Orange = Power

Saving

Displays the Main Menu or exits the control screen and saves adjustments

3. Front Panel Function Control Description

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Do the following to adjust the screen image:

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

NOTE:

All OnView menus and adjustment screens disappear automatically

after about 30 seconds.

To select a control you want to adjust, press ▲ or ▼ to scroll up or down the Main Menu.

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

To adjust the control, press the up ▲ or down ▼ buttons.

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 graphic card so that it outputs a video signal 1280 x 1024 @ 60 Hz 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.)

The line at the bottom of the screen tells you what you can do next: Exit or select the Brightness control.

1: Exit 2 : Brightness

Contrast

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Main Menu Controls

Adjust the menu items shown below by using the up ▲ and down ▼ buttons.

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.

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

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.

pre-set value.

functions are not available for DVI input.

NOTE:

1. Auto Image Adjust works with most common video cards.

2. The Auto Image Adjust and most Manual Image Adjust

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Color Adjust

provides several color adjustment modes: preset

color temperatures and

RGB

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

9300K

— Adds blue to the screen image for cooler white (used

in most office settings with fluorescent lighting).

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)

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

To adjust selected color, press ▲ or ▼.

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.

Control Explanation

SRGB

9300K 6500K 5400K User Color

Color Adjust

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.

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Information

displays the timing mode (video signal input) coming from the graphics card in your computer. See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

NOTE:

VESA 1280 x 1024 @ 60 Hz (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.

The

Manual Image Adjust

controls are explained below:

Horizontal Size

adjusts the width of the screen image.

Horizontal Position

moves the screen image left or right.

Vertical Position

moves the screen image up or down.

Fine Tune

sharpens focus by aligning the illuminated text and/

or graphic characters.

Sharpness

adjusts the clarity and focus of the screen image.

Control Explanation

H . / V . Position

Manual Image Adjust

1: Exit 2 : Select

H . Size Fine Tune Sharpness

H. Frequency: 31.47 KHz

Information

V. Frequency: 31.47 Hz Pixel Clock: 24.80 MHz Resolution: 640 x 480 Model No. : Serial No. :

www.viewsonic.com

1: Exit

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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.

OSD Timeout

sets the length of time an 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.

Control Explanation

Memory Recall

returns adjustments to the original factory settings if the display is operating in a factory Preset Timing Mode listed in this user guide.

Exception:

This control does not affect changes made with the

User Color control, Language and Power Lock setting.

Language Select

Setup Menu

Resolution Notice OSD Position OSD Time Out OSD Background

1: Exit

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1. Outline

1.1 POWER On/Off , LED, Button"2" , Up arrow- button , Down arrow button , Button"1" , button ,

Down arrow button , Button"1" , on the front panel.

1.2 Video signal connector, and AC-IN are located on the back side of the cabinet.

1.3 OSD menu includes the following function;

AUTO IMAGE ADJUST CONTRAST / BRIGHTNESS COLOR ADJUST INFORMATION MANUAL IMAGE ADJUST SETUP MENU MEMORY RECALL

1.4 CONTRAST and BRIGHTNESS can be directly controlled with UP / DN key.

2. CONNECTORS

2.1 AC inlet : CEE22 typed connector

2.2 Video signal connector 14P + Mini D-Sub

MNEMONI

SIGNAL

1RVRed Video

2GVGreen Video

3BVBlue Video

4NCNone5GND

Ground(DDC return)

6RGRed GND

7GGGreen GND

8BGBlue GND

+5V

+ 5V (for DDC)

10SGSync GND

11NCNone

SDA

DDC Data

13HSHorizontal Sync

14VSVertical Sync

SCL

DDC Clock

CN6

DB15HD

162738495

1112131415

16 17

4. Circuit Description

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3. ELECTRICAL SPECIFICATIONS

3.1 Standard conditions

Display Area 338 x 270 mm Video Signal 0.7 Vpp Contrast 70% Brightness Max. Ambient 20 +/- 5 °C Input AC Warming up > 30 min Display 1280 x 1024

3.2 POWER

3.2.1 Power supply

Input Voltage 90 -240 ~Volts Power Frequency Input current

50/ 60 Hz +/-3Hz <1.5Arms @ 90Vac

<0.75Arms@240Vac Inrush current 90A(max.) at 230Vac Power consumption 50Watt Output Voltage @0-3.0A load 12Vdc

+/-5%

3.2.2 Power Management

State Power Indicator

On 40Watt Green

Standby <1Watt Amber

Off <1Watt

3.3 Acceptable timing

If your timing is within following specification, this LCD displ ay can automatically function with a certain

position. Horizontal: Sync frequency : 30~81 kHz Vertical: Sync frequency : 56~85Hz(1280x1024,75Hz)

3.4 Signal level and input impedance

3.4.1 Video Signal level This LCD display is adjusted at the factory using 0,7 Vp-p Video signal.

3.4.2 Sync Signal level

H/V Separate : TTL level

3.4.3 Input impedance

Video input : 75 ohms Sync input : > 1 k ohms

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

Analog EDID

______________________________________________________________________

VIEWSONIC CORPORATION

EDID Version # 1, Revision # 3

DDCTest For: ViewSonic VX912

______________________________________________________________________ 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 | 1A 8D 01 01 01 01 01 0E 01 03 20 | 0E 26 1E 78 2E A2 65 A3 57 4C 30 | 9D 25 11 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 43 4E 80 | 30 34 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 31 32 0A 20 120 | 20 20 20 20 20 20 00 28

______________________________________________________________________

(08-09) ID Manufacturer Name = VSC (11-10) Product ID Code = 8D1A (12-15) Last 5 Digits of Serial Number = Not Used

(16) Week of Manufacture = 01 (17) Year of Manufacture = 2004 (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

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(25

-34) CHROMA INFO:

Red X - 0.639 Green X - 0.297 Blue X - 0.146 White X - 0.313

Red Y - 0.342 Green Y - 0.615 Blue Y - 0.068 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) (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

Not Used ______________________________________________________________________ (54

-71) Detailed Timing / Descriptor Blo ck 1:

1280x1024 Pixel Clock: 108.00 MHz

______________________________________________________________________

Horizontal Image Size: 376 mm Vertical Image Size: 301 mm Refreshed Mode: Non-Interlaced Normal Display - No Stereo

Horizontal:

Active Time: 1280 pixels Blanking Time: 408 pixels Sync Offset: 48 pixels Sync Pulse Width: 112 pixels Border: 0 pixels Frequency: 63.98 KHz

Vertical:

Active Time: 1024 lines Blanking Time: 42 lines Sync Offset: 1 lines Sync Pulse Width: 3 lines Border: 0 lines Frequency: 60.02 Hz

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

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+ 49 hidden pages

ViewSonic vx912-1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual