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ViewSonic VA902-2 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VA902-2
VA902b-2
Model No. VS10715
19" Color TFT LCD Display
(VA902-2_VA902b-2_SM Rev. 1b Apr. 2006)
ViewSonic® 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA902-2 VA902b-2 Model No. VS10715 19” Color TFT LCD Display (VA902-2_VA902b-2_SM Rev. 1b Apr. 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

    TABLE OF CONTENTS 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6. Troubleshooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram and Exploded Parts List 9. Block Diagrams 10.

  • Page 4: Precautions And Safety Notices

    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) Disconnect the power plug from AC outlet if the product is not used for a long period of time.
  • Page 5 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. 5.2.
  • Page 6 Place the monitor on a clean and soft foam pad. Placing the monitor on foreign objects. That could scratch the surface of the panel or cause “Mura” The panel is placed facedown on the lap. That may cause “Mura” View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...

  • Page 7: Specification

    2. Specification 1. General Requirements General Specifications Test Resolution & Frequency “1280 x 1024” @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default: Contrast = 70%, Brightness = 100% 2. Signal Interface Video Interface Analog Input Connector DB-15 (Analog) Default Input Connector Defaults to the first detected input...
  • Page 8 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) Changing Modes Maximum Mode Change Blank Time for image Under 3 seconds (Maximum) stability.
  • Page 9 7. Environmental Environmental Conditions Operating Temperature 0°C to +40°C Storage Temperature -20°C to +60°C Operating Relative Humidity 10% 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 View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...

  • Page 10: Front Panel Function Control Description

    3. Front Panel Function Control Description Main Menu With OnView controls Front Control Panel shown below in detail Displays the control screen for the highlighted control. Scrolls through menu options and adjusts the displayed control. Also toggles between two controls on some Power light Also a shortcut to display the screens.
  • Page 11 Do the following to adjust the screen image: To display the Main Menu, press button [1]. Main Menu AUTO Auto Adjust Contrast/Brightness Color Adjust Information Image Adjust Setup Menu Memory Recall 1:EXIT 2:SELECT NOTE: All OnView menus and adjustment screens disappear automatically after about 15 seconds.

  • Page 12: Main Menu Controls

    Main Menu Controls Adjust the menu items shown below by using the up and down buttons. Control Explanation automatically sizes, centers, and fine tunes the Auto Adjust video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. : Auto Adjust works with most common video cards.
  • Page 13 Control Explanation — Individual adjustments for red, green, and blue. User To select color (R, G or B) press button [2]. To adjust selected color, press When you are finished making all color adjustments, press button [1] twice. displays the timing mode (video signal input) Information coming from the graphics card in your computer.
  • Page 14 Control Explanation sharpens focus by aligning the illuminated text and/ Fine Tune or graphic characters. Try the Auto Adjust (see page 9) before using the Fine NOTE: Tune control. adjusts the clarity and focus of the screen image. Sharpness displays the menu shown below. Setup Menu The Setup Menu controls are explained below.
  • Page 15 Control Explanation OSD Background allows you to turn the On-Screen display background on or off. This means that while making adjustments from the OSD control screens you can also view open software applications, or the Windows desktop. returns adjustments to the original factory Memory Recall settings if the display is operating in a factory Preset Timing Mode listed in this user guide.
  • Page 16 Short Cut Key Function Key : 5 Keys ! ! ! ! ▼ ▼ ▼ ▼ ▲ ▲ ▲ ▲ Main Menu Auto Image Adjust [▼ ▼ ▼ ▼ ] or [▲ ▲ ▲ ▲ ] to immediately activate Contrast menu. It should be change to Brightness OSD by push button [2].

  • Page 17: Circuit Description

    4. Circuit Description Scaling controller            GENERAL DESCRIPTION The TSU16AS is total solution graphics processing IC for LCD monitors with panel resolutions up to SXGA. It is configured with a high-speed integrated triple-ADC/PLL, a high quality display processing engine, and an integrated output display interface that can support LVDS panel interface format.
  • Page 18 Copyright c 2004 MStar Semiconductor, Inc. All rights reserved. Pin Name Pin Type Function Pin LVA1P Output A-Link Positive LVDS Differential Data Output 39 LVA2M Output A-Link Negative LVDS Differential Data Output 38 LVA2P Output A-Link Positive LVDS Differential Data Output 37 LVA3M Output A-Link Negative LVDS Differential Data Output 34 LVA3P Output A-Link Positive LVDS Differential Data Output 33 LVACKM Output A-Link Negative LVDS Differential Clock Output 36...
  • Page 19 Input Current, High (IIH) -1.0 uA Input Current, Low (IIL) 1.0 uA Input Capacitance 5 pF DIGITAL OUTPUTS Output Voltage, High (VOH) VDDP-0.1 V Output Voltage, Low (VOL) 0.1 V DYNAMIC PERFORMANCE Analog Bandwidth, Full Power 250 MHz Channel to Channel Matching 0.5% Full-Scale Specifications are subjected to change without notice.
  • Page 20 • Two clock output ports • Two external interrupts, INT1 is shared with Slave IIC interrupt source • Maximum 4 channels of 6-bit ADC • Flash-ROM code protection selection • Hardware ISP (In System Programming), no Boot Code required • Embedded Dual Ports DDCRAM (128-byte x 2 •...

  • Page 21: Adjusting Procedure

    5. Adjusting Procedure 1. Function Test 1.1. Product - 19” LCD Monitor 1.2. Test Equipment - Color Video Signal & Pattern (or PC with SXGA resolution and a sound card) 1.3. Test Condition Before function test and alignment, each LCD Monitor should be run-in and warmed up for at least 30 minutes with the following conditions: (a) In room temperature, (b) With full-white screen, RGB, and Black...
  • Page 22 1.4.2 Function Test Display Pattern Item Test Content Pattern Specification Remark Frequency & Fine Line Moire Eliminate visual wavy Figure 1 Tracking noise. Contrast/Brightness 16 Gray Scale 16 gray levels should be Figure 2 distinguishable. Boundary Horizontal & Vertical Horizontal and Vertical Figure 3 Thickness position of video should be...
  • Page 23 G. Color Pattern (Figure5) B. Color Pattern (Figure 6) Full White Patter (Figure 7) Dark Screen Pattern (Figure 8) Black-White Pattern (Figure 9) 1.5. Function Test and Alignment Procedure 1.5.1 All Modes Reset You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function Controls) first.
  • Page 24 1.5.3 Firmware Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls) - Make sure the F/W is the latest version. 1.5.4 DDC Test Pattern: EDID program - Make sure it can pass test program. 1.5.5 Fine Tune and Sharpness Test Signal: 1280*1024@60Hz Test Pattern: Line Moire Pattern - Check and see if the image has noise and focus performs well.
  • Page 25 F. Adjust Color Temperature: (1) EEPROM INIT (5 BLOCKS): Press “▼” key move cursor to EEPROM INIT, Press “ “ key then monitor will INIT ADC value. (2) Press “▲” key move cursor to “White Balance”, Press “ “ key do white balance adjustment.
  • Page 26 1.5.10 Dead Pixel and Line Test Signal: 1280*1024@60Hz Test Pattern: Dark and White Screen Pattern - Check and see if there are dead pixels on LCD panel with shadow gauge and filter film. - The total numbers and distance of dead pixels should be compliant with the spec. 1.5.11 Mura Test Pattern: White, RGB, Black, &...
  • Page 27 2. Firmware Upgrade Procedure When you receive the returned monitor, please check whether the firmware version is the latest. If not, please do the following procedures to upgrade it to the latest version. 2.1. Equipment Needed - VA902/b-2 Monitor - Fixture for Firmware Upgrade - VGA Cable - PC (Personal Computer) - LPT Cable...
  • Page 28 2.2. Setup Procedure 2.2.1 Connect P2 of Fixture with printer port of PC by LPT Cable. 2.2.2 Connect P1 of Fixture with VA902/b-2 Monitor by VGA Cable. 2.2.4 Connect Power Cord to VA902/b-2 Monitor. 2.2.5 Connect PC to the additional monitor. 2.3.
  • Page 29 Step 2: Select MCU type Pressing the Comb box to select the type of the MCU, It need to be selected the MTV512M64 for this project. Then press the Create Security File Button to enter step 3. Step 3: Creat Security File Enter the three string into the blank like fig 2.
  • Page 30 Step 4: Load file Press the Load MCU File button to select the file will be download. (*.hex) Step 5: Run Pressing the Run Button to start download program. Press OK button to Enter ISP mode. View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 31 Step 6: Download program finish Pressing the OK Button to finish the download program procedure. Trouble shooting: If you find the status like the follow picture. Please check the following item. a. The connecting status between PC and ISP board. b.
  • Page 32 3. DDC Key In Procedure Note: 1. Every time after replacing the main board, you have to do the DDC key in. 2. If you find the DDC does not conform to the monitor, you have to do the DDC key in. 3.1.
  • Page 33 3.2. Setup Procedure 3.2.1 Connect VGA Card and DDC Card with RS-232 cable. 3.2.2 Barcode Reader connect with keyboard and PC keyboard port. 3.2.3 Connect RS-232 Cable and VA902(2) with VGA Cable. (when key in DVI DDC information, use VGA transform to DVI port ) 3.2.4 Connect Power Cord to VA902(2) Monitor.
  • Page 34 3.3.3 When appear the PIC “ choose DDC Card”, Press ALT+2 Enter DDC 2B test interface. Choose DDC Card 3.3.4 Press F8 to choose corresponding model.DAT (VA902(2).DAT press “ENTER” key) View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 35 3.3.5 Press F9 enter the download interface 3.3.6 Key in the serial number or use the barcode reader to scan the barcode of the monitor, and press “ENTER” key. View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 36 3.3.7 The successful picture is as follows. ”Compare EDID OK! Press any key to continue”. 3.3.8 Let VA902(2) active then see the information in OSD, it shows ”Serial NO : PPZ0517A3178” View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 37 3.4. Check Method Use ViewSonic EDID Editor Connect the VA902(2) to PC with VGA Cable. Excute the EDID Editor, then Press Ctrl+F5. If the DDC is correct, you can see the information as follow: View Sonic Corporation Confidential - Do Not Copy...
  • Page 38 Packing For Shipping 1. Packing Procedure 1.1 Paste protection film to protect the monitor. (Figure 1) 1.2 Put the monitor in the PE bag and seal the bag with tape. (Figure 2) Figure 1 Figure 2 1.3 Put the cushions on the monitor. (Figure 3) 1.4 Place the monitor into the carton and then put all the accessories into the carton.
  • Page 39 Disassembly Procedure 1. Disassembly of Stand unit from Monitor 1.1 Remove two Hinge Cover. 1.2 Unscrew four screws that secure Stand Unit. 1.3 Detach Stand Unit from the monitor. View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 40 2. Disassembly of Front Cover and Rear Cover 2.1 Unscrew two screws that secure Rear Cover to remove Front Cover. 2.2 Unscrew 2 screws to remove Rear Cover. View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 41 3. Disassembly of Hinge, Main Board, Keypad Board and Panel Unit 3.1 Unscrew 4 screws to remove Hinge. Hinge 3.2. Unscrew 2 screws to remove Shielding Plate. Shielding Plate 3.3. Unscrew 2 screws and disconnect the connector to remove VGA Cable. VGA Cable 3.4.
  • Page 42 3.5. Lay Panel Unit facedown and unscrew 4 screws on its right and left sides to remove Panel Unit and Keypad Board. Keypad Board Panel Unit Panel Bracket View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...

  • Page 43: Troubleshooting Flow Chart

    6. Trouble Shooting Flow Chart START CHECK MAIN BOARD CHECK POWER CHECK I102 AND 5V OK? OARD ROUND CAP OK? CHECK I104 3.3V CHECK I104, 3.3V UROUND CAP SUROUND CAP BEAD OK? CHECK I103, CHECK I103 1.8V 1.8V SUROUND CAP UROUND CAP BEAD OK? View Sonic Corporation...

  • Page 44: Mcu No Function

    6.1. NO POWER CHECK POWER CHECK CHECK 5V O/P PANEL STAR I902 P901~P904 T801 CHECK I901 CHECK Q905, Q911 12V O/P Q907, Q908 C823 Q909, Q910 CHECK CHECK F801 CHECK D823 D801 C805 T901, T902 D822 CHECK MAIN I801 BOARD Q801 6.2.
  • Page 45 6.3. NO DISPLAY Power key Check Check Check Work ok Keypad 5VMCU I102 Check Check Check Check H V sync I101 P101 I/O cable Check R.G.B Check Check Check DATA I/O cable I101 P102 Check Check Check Check VCC2.5V,3.3v C126,C127 X101 I101,I102 Check...

  • Page 46: Recommended Spare Parts List

    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. View Sonic Corporation...
  • Page 47 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 48 2053754700P LED INDIC.-PWR VE910 PMMA 94HB COLOR CLEAR 1F02 PL-00003025 2044267101P FUNCTION KEY ABS 94HB ELECTROPLATE AL 1F03 M-MS-0808-9214 2051352100P NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 1F04 M-00003535 2051352101P NAME PLATE VIEWSONIC 3-BIRD LOGO TNP 1F04 #N/A 2051352800P NAME PLATE 38.00MM*5.90MM...
  • Page 49 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty E-00003555 2302047291P CAP,MTL MEF 4700pF/50V P=5.0 J T C826 E-00003311 2302010491P CAP,MTL MEF 0.1uF/50V P=5.0 J T C901 #N/A 2275822001P CAP CER TC 22pF/3KV CH J P=7.5 C C902 C916 #N/A 2284010291P CAP CER CC 1000p/50V X7R P=5.0 K T...
  • Page 50 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty Q101 E-Q-0402-0718 2361316191P XISTOR,NPN R 2PC945P TO-92 PHILIPS Q806 Q901 Q101 E-Q-0402-0555 2361313691P XISTOR,NPN R KSC945CGTA TO-92 FAIRCHILD Q806 Q901 Q101 E-Q-0402-0428 2361302591P XISTOR,NPN R 2SC945-AP TO-92 NEC Q806 Q901...
  • Page 51 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty S802 M-MS-0808-1313 2407200791P HOLDER,FUSE FC-05C S803 #N/A 2374228012P XFORMER,POWR PT-003701-1 LAI-TAI T801 #N/A 2374228016P XFORMER,POWR T801 #N/A 2374301000P XFORMER INVERTER EEL-19 22/2000Ts 0.1*20/0.06mm T901 T902 E-00003308 2202130701P PC BOARD JT178QP4D M/B FR1 228*145 2.01...
  • Page 52 2053754700P LED INDIC.-PWR VE910 PMMA 94HB COLOR CLEAR 1F02 PL-00003025 2044267101P FUNCTION KEY ABS 94HB ELECTROPLATE AL 1F03 M-MS-0808-9214 2051352100P NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 1F04 M-00003535 2051352101P NAME PLATE VIEWSONIC 3-BIRD LOGO TNP 1F04 #N/A 2051352800P NAME PLATE 38.00MM*5.90MM...
  • Page 53 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 2275822001P CAP CER TC 22pF/3KV CH J P=7.5 C C902 C916 #N/A 2284010291P CAP CER CC 1000p/50V X7R P=5.0 K T C903 C904 C926 C927 #N/A 2275450901P CAP CER TC 5P/3KV SL P=7.5 J C...
  • Page 54 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty Q101 Q806 E-Q-0402-0555 2361313691P XISTOR,NPN R KSC945CGTA TO-92 FAIRCHILD Q901 Q101 Q806 E-Q-0402-0428 2361302591P XISTOR,NPN R 2SC945-AP TO-92 NEC Q901 #N/A 2360501396P FET,P-CH SMD AP2305GN SOT23 APEC Q102 #N/A 2360501296P FET,P-CH SMD (EOL) AO3411 SOT-23 AOS...
  • Page 55 Location Universal number# Q'ty Item ViewSonic P/N Ref. P/N Description E-00004503 2212009401P LCD PANEL M190EN03-V3 (A GRADE) AUO V901 X101 E-X-0415-0119 2369103601P XTAL,OSC 12.0000MHZ/49US 0.1mW/30pF Z101 Z102 Z103 Z104 #N/A 2363516895P DIODE,ZENER HZ6B-2 5.6-5.9V DO-35 HITACHI View Sonic Corporation Confidential - Do Not Copy...
  • Page 56 8. Exploded View And Exploded Parts List ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 57 ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 58 EXPLODED PARTS LIST (VA902/b-2) ViewSonic Model Number: VS10715 Rev: 1a Serial No. Prefix: Q4Q Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 2024268703P FRONT BEZEL ABS 94HB PS-7604B VA902 #N/A 2024268704P FRONT BEZEL ABS 94HB MIDNIGHT GRAY VA902B PL-00003024 2053754700P LED INDIC.-PWR...
  • Page 59 9. Block Diagram INPUT SW power D822,D823 100v- 220v supply T801 I801 INVERTER PANEL VLCD I901 DISPLAY Q102 D919 ,D91 0 3.3V SCALAR Q901 I104 I101 1.8V I103 X101 SYNC 3.3VMCU R,G,B INPUT I102,DDC R113 R111 D109 ,D110,D11 2 H,V SYNC EEPROM VGA D-SUB P101...
  • Page 60 AP1117T18 VCC_1v8 ( 4 ) C141 100uF/16V add heat piece VCC5V--(5,6) TO-263 VCC_3v3 I104 R139 AP1084T33 VCC_3v3 (3, 4,6 ) 1w1ohm C148 C144 C145 100uF/16V ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 61 R112 C108 Z101 2.2K 5.6V 5.6V 33pF 220pF 2.2K DDC-SDA R114 DDC_DAT ( 6 ) R115 DDC-SCL DDC_CLK ( 6 ) Z104 Z103 5.6V 5.6V ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 62 AD2 ( 6 ) AD1 ( 6 ) AD0 ( 6 ) XOUT AD3 ( 6 ) VCC_3v3 R162 R163 AdjBACKLIGHT ( 2 ) BRIGHT C189 10uF/50V ViewSonic Corporation SCALER Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 63 REX0- BL106-30RL-A VCC5V VLCD Q102 AP2305 ( 2,3,6 ) VCC5V R122 R124 D111 Q101 ( 6 ) onPANEL 2SC945 R123 4.7K R127 C136 1u/50V ViewSonic Corporation RTD2523 Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 64 LCD_ONOFF LED_AMBER LED_A LED_G LED_GREEN MENU Q103 Q104 MENU PLUS 2N3906 2N3906 MINUS DOWN EXIT SELECT C129 C130 C131 C132 C133 C134 C135 RP05 JST-PH8P-2.0-90 ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 65 10.6. KEY PAD P701 2_SELECT DOWN MENU LED_GREEN LED_AMBER LCD_ONOFF JST-PH8P-2.0-180 D701 S701 S702 S704 S703 S705 ViewSonic Corporation KEY PAD Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 66 I802 R831 T2.5A/250V TLP621 I803 91K 1% C815 TL431D D810 C803 4.7U/50V 4700pF C802 R837 1K 4700pF R851 JUMPER WIRE S801 AC IN 100~240V ViewSonic Corporation POWER Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...

  • Page 67: Viewsonic Corporation

    R929 R926 R923 SB140 0.1uF Brightness 51.1K/1% 110K/1% 91K/1% C917 Q911 R930 D914 C924 R937 R936 0.1uF AP9977GM 5.1K 1N4148 68nF 698/1% 698/1% D910 1N4148 ViewSonic Corporation Model Title Date Rev: View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 68 View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 69 View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...
  • Page 70 View Sonic Corporation Confidential - Do Not Copy VA902-2_VA902b-2...

  • Page 71: Exploded Diagram And Exploded Parts List

    Company: Add.: Fax: Tel: 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) View Sonic Corporation Confidential - Do Not Copy...

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