ViewSonic VA912-4 Service Manual
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ViewSonic VA912-4 Service Manual

ViewSonic VA912-4 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VA912-4
VA912b-4
Model No. VS10867
19" Color TFT LCD Display
(VA912-4_VA912b-4_SM Rev. 1c Jun. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VA912-4

  • Page 1: Service Manual

    Service Manual ViewSonic VA912-4 VA912b-4 Model No. VS10867 19” Color TFT LCD Display (VA912-4_VA912b-4_SM Rev. 1c Jun. 2006) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 2: Revision History

    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.

  • Page 3: Table Of Contents

    Specification Front Panel Function Control Description Circuit Description Adjustment Procedure Troubleshooting Flow Chart Recommended Spare Parts List Exploded Diagram and Exploded Parts List Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 4: Precautions And Safety Notices

    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 VA912-4_VA912b-4...
  • Page 5 (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 VA912-4_VA912b-4...
  • Page 6 VA912-4 series handling Notice Correct Method Incorrect method Correct Method Incorrect method Correct Method Incorrect method ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 7 Correct Method Incorrect method Correct Method Incorrect method ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 8: Specification

    (1.8m, color: black) with PC 2001 Arabic, English, Finnish, Spanish, German, ViewSonic CD Wizard Italian, Swedish, Polish, Korean, Portuguese, Russian, French, Simplified Chinese, Traditional ViewSonic Quick Start Guide Chinese, Hungary, Czech, Turkish Screen Protector Mylar Warranty Sticker Warranty Card Carton Sticker...
  • Page 9 1152 x 870, 1280 x 720, 1280 x 960, 1280 x Resolution Compatibility 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 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 10 Color = Black Power Saving Operation(Method) VESA DPMS Signaling ON Mode < 36 W (max) Power Consumption ACTIVE OFF < 1 W Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 11 The monitor needs to do “A uto 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”) l While running Change Mode, Auto Adjust or Memory Recall, the image shall blank ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 12 (1) ID label - The panel code “T” for HSD panel should be shown on the lower right side of ID label. (See Figure 2) (2) UPC label - The panel code “T” for HSD panel should be shown on the lower right side of UPC label. (See Figure 3) ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 13 Minimum: 130 Response Time 8ms (Tr= 2 ms, Tf = 6 ms) (typ) 10%-90% @ Ta=25°C 20 ms (Tr= 7 ms, Tf = 13 ms) (max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 14 Minimum: TBC Response Time 8ms (Tr= 2 ms, Tf = 6 ms) (typ) 10%-90% @ Ta=25°C 12 ms (Tr= 4 ms, Tf = 8 ms) (max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 15 ● 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 : 5°C to +35°C ●...

  • Page 16: Front Panel Function Control Description

    3. Front Panel Function Control Description ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 17: Main Menu Controls

    ViewSonic VA921-4/VA921b-4/VA912-4U Main Menu Controls Adjust the menu items shown below by using the up and down buttons. A. 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.

  • Page 18: Circuit Description

    SIGNAL DB15HD Red Video Green Video Blue Video None Ground (DDC return) Red GND Green GND Blue GND +5V (for DDC) Sync GND None DDC Data Horizontal Sync Vertical Sync DDC Clock ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 19: Electrical Specifications

    ELECTRICAL SPECIFICATIONS 3.1 Standard conditions Display Area 376.32 x 301.056 mm Video Signal 0.7Vpp Contrast Default Brightness Default Ambient 20 +/- 5 °C Input Warming up > 30 min Display 1280 x 1024 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 20 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 VA912-4_VA912b-4...
  • Page 21 Time: 15:03:33 Date: Fri Aug 05, 2005 ______________________________________________________________________ ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VA912-4SERIES ______________________________________________________________________ ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63...
  • Page 22 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 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 23 Time: 15:02:23 Date: Fri Aug 05, 2005 ______________________________________________________________________ ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VA912-4SERIES ______________________________________________________________________ ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ViewSonic Corporation Confidential - Do Not Copy...
  • Page 24 640 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: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 25 Border: 0 lines Frequency: 60.02 Hz Digital Separate, Horizontal Polarity (+) Vertical Polarity (+) ______________________________________________________________________ (72-89) Detailed Timing / Descriptor Block 2: Monitor Serial Number: PW8050100001 ______________________________________________________________________ (90-107) Detailed Timing / Descriptor Block 3: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 26 The RTD2523 chip has three ADC's (analog-to-digital converters), one for each color (red, green and blue) .The analog RGB and synchronous signals are connected to RTD2523 as described below: Pin Name Pin Number Red + Red - Green + ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 27 12Vdc to drive four cold cathode fluorescence tubes. Electrical specification described as below. 6.3.1 Inverter Electrical specification described as below. INPUT Rated Input Voltage 12Vdc Input Voltage Range 11.4~12.6Vdc Input Current <1.96A Off state Input Power <0.1W ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 28 Inrush Current <100A @ 90Vac(Cold start) Efficiency 80 % TYPICAL AT 115VAC FULL LOAD OUTPUT Output Voltage Regulation +/-5% Output Ripple and Noise 120 mVp-p Rated Output Current <4.16A Turn-on Delay <3 seconds ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 29: Adjustment Procedure

    1024 x 768 @ 75Hz, 60.0kHz 1024 x 768 @ 85Hz, 68.67kHz 1152 x 870 @ 75Hz, 68.7kHz 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280x 720 @ 60Hz, 45kHz (HDTV) ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 30 Full black Full black Pattern 7 5-cycle pattern 5-cycle pattern Check the BU Pattern 8 1-dot pattern 1-dot pattern Check the flicker Pattern 9 Pattern 1 Pattern2 Pattern 3 Pattern4 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 31 Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 32: Osd Function Menu

    Press the [2] button to select the currently highlighted item. Press the [1] button to exit the currently highlighted item. 6) User Color Item Press the [2] button to enter the user color page. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 33 Press the [2] button to enter the sharpness adjustment page. Press the [1] button to exit the page. Press “[▲]” Button to increase image sharpness. Press “[▼]“ Button to decrease image sharpness. (8) Setup Menu Page: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 34 Press the [1] button to exit the page. Enable, Disable Option Press the [▲] button to highlight the previous option or the [▼] button to highlight the next option. Press the [2] button to select the highlighted option. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 35 Press the [▲] button to increase the brightness. Press the [▼] button to decrease the brightness. Press the [2] button to enter the contrast adjustment page. Press the [1] button to exit the page. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 36 Press “[▲]” Button to increase image sharpness. Press “[▼]“ Button to decrease image sharpness. (7) Setup Menu Page: Press the [2] button to enter the setup menu page. Press the [1] button to exit the page. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 37 Press the [▲] button to highlight the previous option or the [▼] button to highlight the next option. Press the [2] button to select the highlighted option. Press the [1] button to exit the page. ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 38 [2] button to enter Burn Mode. When Installing a New Main Board 1. Enter Factory Mode. 2. Use a PC or chrom to send a 32-tone gray scale signal to the monitor. 3. Select “Auto Color” ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 39: Firmware Update Procedure

    When you received a received monitor , please check whether the firmware version. If not , please following procedure to upgrade to the latest version . 1. Equipment needed : - VA912-4/VA912b-4/VA912-4U - PC ( Personal computer ) - LPT cable...
  • Page 40 PC or notebook, parallel(printer) cable, ISP tooling. Software: If OS was Win2000 or WinXP , please install “PORT95NT.exe” In order to ensure can execute ISP program, please set BIOS in PC or Notebook as Fig 0.0 Fig 0.0 Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 41 0.1 Double-click the “ PORT95NT.exe” in Windows & install the program. , see Fig 0.1 Fig 0.1 0.2 Keep on press “ Next “ 4 times to go through the installation processes, see Fig. 0.2 Fig. 0.2 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 42 0.3 Choose “ Typical “ t hen press “ Next “ , see Fig. 0.3 Fig. 0.3 0.4 Keep on press “ Next “ 4 times to go through the installation processes, see Fig. 0.4 Fig. 0.4 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 43 0.5 Install completed , restart the PC or notebook. See Fig 0.5 Fig. 0.5 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 44 1.2 After extracting the ZIP file , the total files list as Fig 1.0 , and double click the file of setup.exe to install. Fig 1.0 1.3 Press “ Next “ button to continue., see Fig 1.1 Fig 1.1 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 45 1.4 Keep default setting or press “ Change “ button for selecting the path that you want , and then press “ Next “ button to continue , see Fig 1.2 Fig 1.2 1.5 Press “ Install “ button to continue , see Fig 1.3 Fig. 1.3 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 46 Appendix B : How to use software to upgrade the BIOS : 2.1 After installation , we could find the shortcut in the setting path or the program bar ( default setting ) , see Fig Fig. 2.1 Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 47 2.3 The warning is used to remind user of that different CPU rate may cause ISP function fail. (it’s limited by IIC protocol ) , press “ OK “ button , see Fig 2.3 Fig. 2.3 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 48 7C , 4C , 77. The command No. and command must be set by user while coding. About the detailed of setting , please refer to section 6 boot code of ISP . Fig. 2.5 Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 49 3.3 CRC ( cyclic redundancy check ) : the host can check CRC register’s result instead of reading every byte in flash . The message of Check MCU CRC OK means that the host verify OK for the progress of program , see Fig.3.2 Fig. 3.2 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 50 VA912-4 series de-assembling procedure 1. Move the monitor our from carton 2. Put the monitor on desk & face down 3. Remove the I/O cover 4. Loose the screws & remove the stand 5. Separate the hook by tool (coin or screw-driver) 6.
  • Page 51 8. Loose the shielding screw 9. Tear off the yellow tape 10. Tear off the black tape 11. Loose the Button/B screw 12. Move the Button board 13. Remove the speaker 14. Remove the shielding ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 52 15. Remove the AL-foil 16.Remove the AL-Foil & black tape 17. Loose the shield 18. Loose the bezel screw ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 53 19. Loose the BKT screw L/R 20. Remove the PCBA & mylar 21. Take out PCBA & remove the cables ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 54 VA912-4 series packing method 1. Sticker on LCD protection film 2. Put the monitor into the PE or EPE bags 3. Put on the end-cap left / right 4. Put the monitor into carton Face-up 5. Put all accessories into carton 6.

  • Page 55: Troubleshooting Flow Chart

    Output 3.3V? Check U3 pin 2 Change U3 Output 2.5V? Check X’tal Y1=24.576MHz? Change Y1 or Y2 And Y2=11.092MHz? Change cable or Check button cable button board & button board? Change M/B ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 56 Change Speaker or Check JP2 to JP2(Cable) Speaker OK? Change power Check CN1 pin board module 1,2=12V? Change Q15 Check U9(pin6) Volume and Q Check U9 Change U9 pin12(Mute),pin11( Stby) Change M/B ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 57 Display color abnormal: Display color abnormal Check panel Change panel cable cable? Check open/short Repair open/short of U6 Check panel Change Q8 power supply of heck panel Change panel Change M/B ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 58: Recommended Spare Parts List

    Remark 1: Above listed items are examples, supplier can expand the rows to add more necessary items. Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.

  • Page 59: Viewsonic Corporation

    BOM LIST (VA912-4)(HSD) ViewSonic Model Number: VS10867 Rev: 1b Serial No. Prefix: Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 1L9VAHXVS88 L9VA-H LCD MONITOR(VA912-4)(S/B,USA)GP 21L9ZCMB035 L9ZC M/B ASSY(FOR L9VA-H)RTD2523B GP 31L9ZCSS014 L9ZC M/B S/S ASSY(FOR L9ZC-6U)2523B GP DFHD08FR005 CONN DIP HEADER 8P2R FR(P2.54,H5.0) GP...
  • Page 60 BOM LIST (VA912b-4)(HSD) ViewSonic Model Number: VS10 Rev: 1b Serial No. Prefix Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 1L9VAHXVS02 L9VA-H LCD MONITOR(VA912B-4)(USA) GP 21L9ZCMB035 L9ZC M/B ASSY(FOR L9VA-H)RTD2523B GP 31L9ZCSS014 L9ZC M/B S/S ASSY(FOR L9ZC-6U)2523B GP DFHD08FR005 CONN DIP HEADER 8P2R FR(P2.54,H5.0) GP...

  • Page 61: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 62 EXPLODED PARTS LIST (VA912-4) ViewSonic Model Number: VS10867 Rev: 1b Serial No. Prefix: PW7 Item ViewSonic P/N Ref. P/N Description Q'ty B-00004169 21L9TAMB090 L9ZC M/B ASSY(RTD2523b-LF) GP B-00003993 AS05B312D00 ADP/INV,FSP043-2PI01 90~264V GP B-00004170 23L9VABB003 L9VA BUTTON/B ASSY GP EAL9VA01021 LCD BEZEL L9VA S(EAL9VA01,R3A) GP...
  • Page 63 EXPLODED PARTS LIST (VA912b-4) ViewSonic Model Number: VS10867 Rev: 1b Serial No. Prefix: PW8 Item ViewSonic P/N Ref. P/N Description Q'ty 21L9ZCMB038 L9ZC M/B ASSY(RTD2523B-LF) GP B-00003993 AS05B312D00 ADP/INV,FSP043-2PI01 90~264V GP B-00004170 23L9VABB003 L9VA BUTTON/B ASSY GP EAL9VA01012 LCD BEZEL L9VA GP...
  • Page 64 Packing for Shipping PACKING PART LIST ( VA912-4 ) ViewSonic Model Number: VS10867 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 1L9VAHXVS88 VA912 monitor HBL9VA010013 END CAP (L) P-00004180 HBL9VA02010 END CAP (R) HGL9V01018 USER'S MANUAL & CD A-00003642 DM33T181004 POWER CORD 3P 1.8M...

  • Page 65: Block Diagram

    9. Block Diagram Backlight ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 66: Schematic Diagrams

    DEL R173,R174; ADD D1 Modify 3DVCC NC/CX201209805/8 VCPU MMBT3906 CX201209805/8 DSUB_5V 1N4148 1N4148 C101 C100 NC/6 0.1u/6 R143 4.7K/6 3DVCC MMBT3906 R144 4.7K/6 For layout ViewSonic Corporation POWER Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 67 R159 RX0- R160 TX0- TX0+ RX0+ RX5- RX5+ R161 RXC+ R162 TXC+ RXC- TXC- 0.1U/6 Z5.6 1U/6NC ViewSonic Corporation Z5.6 Z5.6 Z5.6 Z5.6 VGA AND DVI INPUT Model DVI-D/NC Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 68 RXOIN2- RXOIN2+ RXOCKIN- RXOCKIN+ RXOIN3- RXOIN3+ R178 R177 DGND DGND PANEL_5_12VCC PANEL_5_12VCC PANEL_5_12VCC 1841 30P RTD_SCLK RTD_SDO/SDI SDIO1 SDIO2 SDIO3 RTD_SCSB 100/6 RESET DDC_SDA DDC_SCL ViewSonic Corporation RTD2523 Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 69 4.7K/6 5DVCC VCC12 R108 4.7K/6 HEADER 4 KEY1 R170 R171 R172 KEY2 4.7K/6 4.7K/6 4.7K/6 6.8K/6 KEY3 KEY1 2K/6 KEY2 KEY3 2004/12/28 ViewSonic Corporation 2004/12/28 MCU & BUTTON Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VA912-4_VA912b-4...
  • Page 70 SPKOUTR MUTE OUTR AGND 330U/16V AGND MUTE MUTE TDA7496L DTC144EUA AGND L23 BEAD/1206 VCC12 AGND AGND AGND R140 10K/6 R141 10K/6 STBY STBY DTC144EUA ViewSonic Corporation AUDIO AGND Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...

  • Page 71: Pcb Layout Diagrams

    11. PCB Layout Diagrams MB TOP ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 72 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 73 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 74 ViewSonic Corporation Confidential - Do Not Copy VA912-4_VA912b-4...
  • Page 75 Add: Tel: Fax: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com) ViewSonic Corporation Confidential - Do Not Copy...

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