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ViewSonic Va1912wb 3 Service Manual

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    ViewSonic VA1912w-3  VA1912wb-3 
    Model No. VS10866 
    19” Color TFT LCD  Display 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    (VA1912w-3_VA1912wb-3_SM Rev. 1a Aug. 2006) 
    ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 
    Service Manual  
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    Copyright 
    Copyright © 2006 by ViewSonic Corporation.    All  rights reserved.    No part of this publication 
    may be reproduced, transmitted, tran scribed, 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 ot herwise, 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. 
     
    Revision History 
    Revision  SM Editing Date  ECR Number  Description of Changes  Editor 
    1a  8/8/2006      Initial Release  Jamie Chang 
           
           
           
           
           
           
         
    Trademarks 
    Optiquest is a registered trademar k of ViewSonic Corporation. 
    ViewSonic is a registered trademar k of ViewSonic Corporation. 
    All other trademarks used within this document ar e the property of their respective owners. 
     
      
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    TABLE OF CONTENTS 
     
     
    1.  Precautions and Safety Notices    1
    2. Specification   3
    3.  Front Panel Function Control Description  10
    4. Circuit Description  16
    5. Adjustment Procedure 17
    6.  Troubleshooting Flow Chart  37
    7. Recommended Spare Parts List 45
    8.  Exploded Diagram and Exploded Parts List  49
    9. Block Diagram  51
    10. Schematic Diagrams 52
    11.  PCB Layout Diagrams  59
     
      
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    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 surf ace with sharp or hard objects.   
    (8) Do not place heavy objects on the LCD di splay, video cable, or power cord.   
    (9) Do not use abrasive cleaners, waxe s 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. Servi ce 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 i s 
    exposed in such areas as the a ssociated 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 th e 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 th e Signal Interface Connector, be sure not to  rotate or tilt the Interface Connector of 
    the TFT Module.   
      (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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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
     
    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“. 
      
    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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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    2. Specification 
    2.1 INSTRUCTION   
    FEATURES  VA1912w-3 / VA1912wb-3 
    Size  19” wide 
    Luminance (Typ, cd/㎡)  300 cd/㎡ 
    Contrast Ratio (Typ)  700:1 
    Colors ( 6 bit + 2 bit FRC)  16.2 M colors 
    Response Time (Typ)  8 ms 
    Viewing Angle  (H/V) 150 ° / 130 ° 
    TFTLCD PANEL 
    Recommend resolution  1440 x 900@60Hz 
    Analog (75ohms, 0.7/1.0 Vp-p)  Yes Input Signal 
    Digital Yes 
    Separate Sync  Yes 
    Composite Sync  No Sync Compatibility 
    Sync on Green  No 
    PC Yes 
    Power Mac  Yes Compatibility TV Box (NextVision 6)  Yes 
    Power Voltage  AC 100-240V, 50/60Hz  Yes 
    On Mode(Max / Typ)  36W(max) / 32W(typ) Power Consumption 
    Active Off Mode (Max)  2W 
    Audio Amplifier / Speaker  1.5 W / 2.5W x 2 
    Tilt ( 20 ° to   -5 °)  Ye s  
    Swivel No 
    Pivot No Ergonomics 
    Height Adjust  No 
    OSD Control  [ ; X] [ 1 ] [ ▼] [▲ ] [ 2 ] []   Yes 
    Physical    (W x H x D mm)  451
     x 391  x 197  (mm) 
    17.8  x 15.4  x 7.8  (in)  
    Dimension 
    Package (W x H x D mm)    538
     x 470  x 158  (mm) 
    21.2  x 18.5  x 6.2  (in) 
    Physical (Net kg/lb)  4.5kg (9.9lb) We i g h t  
    Package (Gross Kg/lb)  6.2kg (13.7lb) 
    Temperature (℉/℃ ) 41 ℉-95 ℉/+5 ℃-+35 ℃ Operating Condition 
    Humidity (%)  20 % - 80 % 
    Temperature (℉/℃ ) -4 ℉-131 ℉/-20 ℃-55 ℃ Storage Condition 
    Humidity (%)  20 % - 85 % 
    Regulation CB / TCO
    03/ UL/cUL / FCC-B / ICES 003 / Argentina-TUV/S / NOM / EPA Energy 
    
    Star / TUV/Ergo / ISO13406-2 / TUV/GS  / CE / GOST-R / SASO / BSMI / PSB / 
    C-Tick / Korea (MIC) / CCC    
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    2.2 GENERAL SPECTION   
     
    Test Resolution & Frequency  1440 x 900 @ 60Hz 
    Test Image Size  Full Size 
    Contrast and Brightness Controls  Factory Default:   
    Contrast = 70%, Brightness = 100% 
     
    2.3 VIDEO INTERFACE 
    Analog Input Connector  DB-15 (Analog), refer the appendix A  
    Digital Input Connector                                         DVI-D
    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 1.
      Video RGB (Analog) 
    2.   DVI (Digital) 
    Separate 
    Video Impedance  75 Ohms (Analog) 
    Maximum PC Video Signal  950 mV with no damage to monitor 
    Maximum Mac Video Signal  1250 mV with no damage to monitor 
    Sync Signals  TTL 
    DDC 2B  Compliant with Revision 1.3 
    Sync Compatibility  Separate Sync 
    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, 1280 x 768, 
    1280 x 960, 1280 x 1024, 1440 x 900 
     
    * 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 
      
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    2.4 POWER SUPPLY 
    Power Supply (Adapter)  Part Number:  27-D003247 
    Input Voltage Range  90 to 264 VAC 
    Input Frequency Range 47 to 63 Hertz 
    Short Circuit Protection OUTPUT CAN BE SHORTED WITHOUT DAMAGE 
    Over Current Protection FUSE 3.15
    A TY P I CA L AT  250 VA C  
    Leakage Current  75 
    MA (MAX) AT 240VAC / 50HZ 
    Efficiency  80 % TYPICAL AT 100VAC @60HZ 
    Fuse  INTERNAL AND NOT USER REPLACEABLE 
    Power Dissipation 36 
    WAT T S  
    Max Input AC Current  1.6
     ARMS  @  nominal RANGE 
    Inrush Current (Cold Start)  80 A @ 240VAC , 50HZ 
    Power Supply Cold Start  SHALL START AND FUNCTION PROPERLY WHEN 
    UNDER FULL LOAD, WITH ALL COMBINATIONS 
    OF INPUT VOLTAGE, INPUT FREQUENCY, AND 
    OPERATING TEMPERATURE 
    Power Supply Transient Immunity 
    SHALL  BE ABLE TO WITHSTAND AN  EN61000-4-4 
    ±2KV TRANSIENT TEST WITH NO DAMAGE 
    Power Supply Line Surge Immunity Shall be able to withstand ±2KV (L-L) and ±2.3KV 
    (L-PE) with no damage 
    Power Supply Missing Cycle Immunity   Shall be able to function properly, without reset or visible 
    screen artifacts, when ½ cycl
    e of AC power is randomly 
    missing at nominal input 
    Power Supply Acoustics  The power supply shall not produce audible noise that 
    would be detectable by the user.    Audible shall defined 
    to be in compliance with ISO 7779 (DIN EN27779:1991) 
    Noise measurements of machines acoustics. Power 
    Switch noise shall not be considered 
    US Type Power Cable   
    Separate 3-prong NEMA 5-15P type plug.    Length = 
    1.8m. Connects to display. 
    Color = Black 
    European Type Power Cable Schuko CEE7-7 type plug. 
    Length = 1.8m, Connects to display.   
    Color = Black 
    CCC Type Power Cable   Separate 3-prong type plug.     
    Length = 1.8m. Connects to display. 
    Color = Black 
    PSE Type Power Cable Separate 2-prong NEMA 1-15P type plug.    Length = 
    1.8m. Connects to display. 
    Color = Black 
    Power Saving Operation(Method)  VESA DPMS Signaling 
    Power Consumption   
    ON Mode < 
    36 W (max) /  32 W  (typ) 
    ACTIVE OFF <  1 W 
    Recovery Time  ON Mode = N/A, ACTIVE OFF < 5 sec  
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    2.5 ELECTRICAL REQUIREMENT 
    Horizontal / Vertical Frequency 
    Horizontal Frequency  30 – 82 kHz   
    Vertical Refresh Rate 50 – 85* Hz. 
    Maximum Pixel Clock  135 MHz 
    (EDID file is 140MHz) 
    Sync Polarity  Independent of sync polarity.  
     
    Timing Table
      
    Item Timing  Analog Digital 
    1  640 x 350 @ 70Hz, 31.5kHz  Yes  Ye s 
    2  640 x 400 @ 60Hz, 31.5kHz  Yes*  Ye s 
    3  640 x 400 @ 70Hz, 31.5kHz  Yes  Ye s 
    4  640 x 480 @ 60Hz, 31.5kHz  Yes  Yes 
    5  640 x 480 @ 67Hz, 35.0kHz  Yes  Ye s 
    6  640 x 480 @ 72Hz, 37.9kHz  Yes  Yes 
    7  640 x 480 @ 75Hz, 37.5kHz  Yes  Yes 
    8  640 x 480 @ 85Hz, 43.27kHz  Yes  Ye s 
    9  720 x 400 @ 70Hz, 31.5kHz  Yes  Yes 
    10  800 x 600 @ 56Hz, 35.1kHz  Yes  Ye s  
    11  800 x 600 @ 60Hz, 37.9kHz  Yes  Yes 
    12  800 x 600 @ 75Hz, 46.9kHz  Yes  Yes 
    13  800 x 600 @ 72Hz, 48.1kHz  Yes  Yes 
    14  800 x 600 @ 85Hz, 53.7kHz  Yes Ye s 
    15  832 x 624 @ 75Hz, 49.7kHz  Yes  Ye s 
    16  1024 x 768 @ 60Hz, 48.4kHz  Yes  Yes 
    17  1024 x 768 @ 70Hz, 56.5kHz  Yes  Yes 
    18  1024 x 768 @ 72Hz, 58.1kHz  Yes  Ye s 
    19  1024 x 768 @ 75Hz, 60.0kHz  Yes  Ye s 
    20  1024 x 768 @ 85Hz, 68.67kHz  Yes  Ye s 
    21  1152 x 864@ 75Hz, 67.5kHz  Yes  Yes 
    22  1280 x 1024 @ 60Hz, 63.4kHz  Yes  Yes 
    23  1280 x 1024 @ 75Hz, 79.97kHz  Yes  No 
    24  1280x 768 @ 60Hz, 47.78kHz    Yes  Ye s 
    25  1280 x 960 @60Hz, 60kHz  Yes  Yes 
    26  1440 x 900 @ 60Hz, 55.96kHz  Yes  Yes 
    *The image vertical size might not be full screen. 
      
    						
    							
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    ViewSonic Corporation 
        Confidential - Do Not Copy     VA1912w-3_VA1912wb-3 
    Primary Presets 
    1440 x 900 @ 60Hz 
     
    User Presets 
    Number of User Presets (recognized timings) Ava ilable: 10 presets total in FIFO configuration 
     
    Changing Modes 
     
    ●  Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Adjust” time       
    ●  Under DOS mode (640 x 350, 720 x 400 & 640 x 400), there is no “Auto Adjust” feature.  
    ●  The monitor needs to do “Auto Adjust” the first time a new mode is detected but except the DOS mode 640 x 350, 720 x 
    400 & 640 x 400.(see section “0-Touch™ Function Actions”)  
    ●  While running Change Mode, Auto Adjust or Memory Recall, the image shall blank  
     
    2.6 FRONT PANEL CONTROLS AND INDICATORS 
    Front Panel Hardware Controls 
    Power Switch (Front Head)  Power Control, soft Power Switch. 
    Power LED (Front Head)  Green – ON  Orange – Active Off 
    Dark = Soft Power Switch OFF 
    Front Panel Controls (Head) 
    [; X] [ 1 ] [ ▼] [▲ ] [ 2 ] [
    ] 
     
      [
    ] Power   
    [ 1 ] BUTTON 1   
    [ 2 ] Button 2 
    [ ▲ ] UP ARROW BUTTON 
    [ ▼ ] DOWN ARROW BUTTON 
    [ ;  X] Audio Mute on/off 
     
    Note: Power Button, Button 1 and Button 2 and Mute Button must be 
    one-shot logic operation. (i.e. there should be no cycling) 
    Reaction Time  OSD must fully appear within 0.5s after pushing Button 1 
     
    Short Cuts Function from the button(s) 
    [1] Main Menu 
    [2]  Input toggle (Analog or Digital) 
    [▼ ] or [ ▲]  To immediately activate Contrast menu. It should be change to Brightness OSD by 
    push button [2] 
    [
    ▼ ] + [ ▲]  Recall both of Contrast and Brightness to default 
    [1] + [2]  Toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode 
    [1] + [ ▼] + [ ▲]  White Balance. (Not shown on user’s guide) 
    [1] + [ ▼] Power Lock 
    [1] + [ ▲] OSD Lock 
    [; X]  Audio Mute on /off  
    						
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