ViewSonic VX924 Service Manual
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ViewSonic VX924 Service Manual

ViewSonic VX924 Service Manual

Viewsonic 19” color tft lcd display
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Service Manual

ViewSonic VX9241
Model No. VS10162
19" Color TFT LCD Display
(VX912_SM. 1a May 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VX9241 Model No. VS10162 19” Color TFT LCD Display (VX912_SM. 1a May 2005) 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

    4. Circuit Description 5. Adjustment Procedure 6. Troubleshooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram and Spare Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams Confidential - Do Not Copy ViewSonic Corporation VX924...

  • 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 6 "MURA." Do not touch the surface of the polarizer . Take out the monitor by grasping the cushion. If the monitor is removed by grasping the LCD panel, that may cause "MURA." Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 7 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. Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 8: Specification

    1280 x 720, 1280 x 960, 1280 x 1024 Resolution Compatibility * 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 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 9 Separate 3-prong NEMA 5-15P type plug. Length = US Type Power Cable 1.8m. Connects to display. Color = Black Schuko CEE7-7 type plug. European Type Power Cable Length = 1.8m, Connects to display. Color = Black Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 10 800 x 600 @ 56Hz, 35.1kHz 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 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 11 - Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto Adjust” - The monitor needs to do “Auto Adjust” the first time when a new mode is detected (See section “0-Touch™ Function Actions”) Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 12 @ CR>10 Typical: 135º Minimum: 125º Total = 4.8ms (black – white) Response Time (Tr=3.4ms, Tf=1.4ms) 10%-90% @ Ta=25°C Total = 4.0ms (gray – gray) Panel Defects Please see Panel Quality Specifications. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 13 - 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 Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 14: Front Panel Function Control Description

    Also toggles between two controls on and saves some screens. adjustments. Also a shortcut to toggle analog and digital connection. Power light Green = ON Orange = Power Saving Power On/Off Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 15 • 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.) Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 16 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). Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 17 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 ®...
  • Page 18 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 19 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. Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 20: Circuit Description

    MNEMONIC 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 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 21 3.1 Standard conditions Display Area 404.2 x 330.0 mm Video Signal 0.7Vpp Contrast Max. Brightness Max. Ambient 20 +/- 5 ¢X C Input Warming up > 30 min Display 1280 x 1024 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 22 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 23 640 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) Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 24 Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VX924 (126) No Extension EDID Block(s) (127) CheckSum OK Confidential - Do Not Copy...
  • Page 25 640 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) Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 26 Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VX924 (126) No Extension EDID Block(s) (127) CheckSum OK Confidential - Do Not Copy ViewSonic Corporation...
  • Page 27 Blue + Blue - 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 28 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. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 29 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 Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 30: Adjustment Procedure

    Press the [2] button to cycle among the colors. Press the [1] button to exit the page. Press the [▲] button to increase the selected color level. Press the [▼] button to decrease the selected color level. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 31 Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item. 1) Language Select Item Press the [2] button to enter the language selection page. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 32 Press the [2] button to select the highlighted option. Press the [1] button to exit the page. (8) Memory Recall Page Press the [2] button to execute the memory recall function. Press the [1] button to exit the page. Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 33: Other Menu

    Press the [1] button to exit the page. (3) Input Select Page: Press the [2] button to switch to analog input mode. (4) Color Adjust Page: Press the [2] button to enter the color adjustment page. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 34 English, French… Option Press the [2] button to select the language. Press the [1] button to exit the page. 2) Resolution Notice Item Press the [2] button to enter the resolution notice page. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 35 Press the [1] button to exit the Contrast Dialog. Press the [2] button to enter the Brightness Dialog. Press the [▲] button to increase the contrast. Press the [▼] button to decrease the contrast. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 36 [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” Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 37 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) Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 38 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 Pattern 2 Pattern 3 Pattern 4 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 39 Pattern 5 Pattern 6 Pattern 7 Pattern 8 Pattern 9 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 40 When examining a monitor, please check whether the firmware version is the latest. If not, please follow the procedure below to upgrade to the latest version. 1. Equipment needed : VX924 PC ( Personal computer ) LPT cable Fixture (LM5ISP)
  • Page 41 Software: If OS is Win2000 or WinXP, please install "PORT95NT.exe". In order to ensure that the system can execute the ISP program, please adjust the BIOS settings in the PC or notebook as shown in Fig 0.0. Fig 0.0 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 42 2. Double-click the "PORT95NT.exe" icon in Windows and install the program; see Fig 0.1. Fig 0.1 3. Continue through the installation process by pressing "Next" four times; see Fig. 0.2. Fig. 0.2 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 43 4. Choose "Typical" then press "Next;" see Fig. 0.3. Fig. 0.3 5. Continue through the installation process by pressing "Next" four times; see Fig. 0.4. Fig. 0.4 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 44 1. The user may download the ISP driver and PORT95NT installation package from the Myson Century website (www.myson.com.) 2. The files extracted from the ZIP file are listed in Fig 1.0. Double-click setup.exe to install. Fig 1.0 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 45 3. Press the "Next" button to continue; see Fig 1.1. Fig 1.1 4. Press the "Change" button to change the install path if desired, and then press the "Next" button to continue; see Fig 1.2. Fig 1.2 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 46 5. Press the "Install" button to continue; see Fig 1.3. Fig. 1.3 6. When installation has finished, press the "Finish" button; see Fig 1.4. Fig. 1.4 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 47 3. The warning shown in Fig. 2.3 is used to remind the user that a CPU rate that differs from IIC protocol may cause the ISP functions to fail; press the "OK" button. Fig. 2.3 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 48 4. As shown in Fig. 2.4, press the "Create Security File" button to key in a security code, and use the slider bar to adjust the speed of the IIC bus. S p eed of IIC bus Securit y code Fig. 2.4 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 49 7C, 4C, 77. The command numbers and commands must be set by the user while coding. For more details, please refer to section 6 boot code of ISP. Fig. 2.5 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 50 1. As shown in Fig. 3.1, select the MTV type first, load the binary or intel hex file to be programmed into the MCU, click "OK," then press the "RUN" button. Ste p 2 Ste p 1 Ste p 3 Ste p 4 Fig. 3.1 Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 51 3. CRC (cyclic redundancy check): the host can check the result in the CRC register instead of reading every byte in flash. The Check MCU CRC OK message indicates that the host has verified the program's CRC; see Fig.3.2. Fig. 3.2 Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 52: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart 1. Display color abnormal: Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 53 Change X1 / X2 Check crystal X1 / X2? Check CN 6, R79 Change failed part Pin 40 of U6? Check power supply Fix power supply circuit (12V, 5V, 2.5V & 3.3V) Change M/B Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 54 3. Monitor white screen Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 55 4. Monitor black screen Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 56 5. Analog input: always shows NO SIGNAL: Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 57 6. Digital input: always shows NO SIGNAL Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 58: Recommended Spare Parts List

    7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VX924-1) ViewSonic Model Number: VS10162-3W Rev: 1a Item Description ECR/ECN ViewSonic P/N Ref. P/N Location Q'ty PC Board Assembly: main board B-00002519 29L9IMB00E5 main board Over driver board B-00002520 22L9V0B0005 Over driver board...
  • Page 59 ViewSonic Model Number: VS10162-3W Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 1L9VDZAVS92 L9V LCD MONITOR(L9VDA-5,AU VX924)US B-00002519 29L9IMB00E5 L9I M/B ASSY(FOR L9VDA-5 REALTEK,2523)AU #N/A 39L9IDP0056 L9I M/B DIP ASSY(L9VDA-5 REALTEK)2523 #N/A 41L9ISS0053 L9I M/B S/S ASSY(L9VDA-5 REALTEK)2523...
  • Page 60 EPE BAG L9VD(HAL9V002,REV3A) P-FM-0602-0896 HBL9V001019 END CAP-L L9V(HBL9V001,REV3A) P-FM-0602-0897 HBL9V002015 END CAP-R L9V(HBL9V002,REV3A) M-LB-0813-0747 HCL7V004013 CORE LABEL(HCL7V004,REV3A) #N/A HCL9V006011 ID LABEL VX924 L9VDA-5(HCL9V006,REV3A) M-LB-0813-0745 HCL7V002011 SERIAL LEBAL L7V(HCL7V002,REV3A) M-LB-0813-1042 HCL7V019011 CARTON LABEL L7VC(HCL7V019,REV3B) P-00002521 HFL9V007011 CARTON VX924 L9VDA-5(HFL9V007,REV3A) #N/A HGL9V011019...

  • Page 61: Exploded Diagram And Spare Parts List

    8. Exploded Diagram and Spare Parts List Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 62 EXPLODED PARTS LIST (VX924-1) ViewSonic Model Number: VS10162-3W Rev: 1a Item ViewSonic P/N Ref. P/N Description Q'ty C-00000987 EAL9V001018 BEZEL L9V(EAL9V001,REV3A) C-FP-0301-1047 EAL9V002014 MIDDLE BEZEL L9V(EAL9V002,REV3A) PL-BT-0706-0165 EBL7V027012 CONTROL BUTTON L7VD(EBL7V027,REV3A) M-MS-0808-9243 FEL7V003019 LOGO FRONT-VSC-38CM L7VC(FEL7V003,REV3A) M-MS-0808-9401 EBL7V028019 LENS L7VD(EBL7V028,REV3A)
  • Page 63 Packing for shipping PACKING PART LIST (VX924-1) ViewSonic Model Number: VS10162-3W Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty VX924 1L9VDZAVS41 VX924 unit P-FM-0602-0896 HBL9V001019 END CAP(L) P-FM-0602-0897 HBL9V002015 END CAP(R) DC-00002523 HGL9V0011019 User manual & CD A-PC-0106-0224 DM333181G97 Power cord 3P 1.8M...
  • Page 64 Packing procedure 1. Apply protective film to the display surface. 2. Put the monitor in EPE bag and seal the bag with tape. 3. Fit the cushions onto the monitor. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 65 4. Put the monitor into the carton and put all the accessories into the carton. Then close the carton. Q SG Power cord Disassembling the monitor 1. Turn the monitor to face the back and remove the I/O cover. 2. Remove the stand back cover. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 66 3. Remove the four black hinge screws and separate the stand and head pieces. 4. Place the monitor face-down on a soft, flat, stable surface. 5. Separate the back cover and the front bezel. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 67 6. Remove the screws that fix the button board (B/B) and pull the cable out from the connector on the main board (M/B). 7. Remove the B/B. 8. Remove the screws on the PCB shield; remove the PCB shield. Screws Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 68 9. Remove the MB-LCD connector and loosen the four screws on the PCB holder. Screws 10. Separate the PCB holder from the panel. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 69 11. Loosen the four screws on the sides of the panel. 12. Remove the front bezel and panel. Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 70 13. Remove the four hexagon screws beside the DVI & D-SUB connectors. 14. Remove the screws that fix the power board and main board. Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 73: Block Diagram

    +3.3V 24LC16 MICRO-CONTROLLER MTV312 AC 90-264V +12V +5.0V +2.5V POWER INVERTER AIC1739 AND AUDIO BOARD 1563 AIC1739 +3.3V Title BLOCK DIAGRAM <Title> Size Document Number <Doc> Date: Friday, October 15, 2004 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 74 RX5- RX5+ R161 TXC+ RXC+ R162 TXC- RXC- 0.1U/6/NC Z5.6/NC 1U/6NC Title VGA AND DVI INPUT Z5.6/NC Z5.6/NC Z5.6/NC Z5.6/NC 10K/6NC Size Document Number DISPLAY DVI-D/NC Date: Friday, October 15, 2004 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 75 RTD_SDO/SDI TEST POINT SDIO1 TCON9 22/6 YCLK SDIO2 TCON10 22/6 YDIO SDIO3 TCON11 22/6 RTD_SCSB 100/6 RESET DDC_SDA DDC_SCL Title RTD_2523 Size Document Number Custom RTD2523_DE_A Date: Friday, October 15, 2004 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 76 STBY PWR_SEL R125 100/6 DDC_SCL P6.7 P3.0/RXD MTV312M64 R109 4.7K/6 5DVCC VCC12 R108 4.7K/6 HEADER 4 6.8K/6 2K/6 Title MCU & BUTTON Size Document Number DISPLAY Date: Friday, October 15, 2004 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 77 If panel is 3.3V LVDS IF, L30 must add the part 2004/4/14 PANEL_3VCC FEB_0805/NV FEB_0805/NC FEB_0805/NC FEB_0805/NC PANEL_5_12VCC RSDS_CON50/NC Title <Title> PANEL INTERFACE Size Document Number <Doc> Date: Friday, October 15, 2004 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 78 0.8A Max VOUT CX000800000/8 ADJ/GND 200/6 1% AIC1084/TO252 330/6 1% LVDS_GND MTH276D126 MTH276D126 LVDS_GND LVDS_GND LVDS_GND LVDS_GND MTH276D126 Title LVDS_GND LVDS_GND <Title> Size Document Number <Doc> Date: Friday, February 25, 2005 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 79 5 6 7 8 DRAM_16M DRAM_16M 3.3V SDRAM1_3.3V CX00080 0000/8 DGND DGND DGND 3.3V SDRAM2_3.3V CX00080 0000/8 DGND VTIO3601_16Mbx4 Ref. Circuit Title Size Document Number <Doc> Date: Friday, February 25, 2005 Sheet Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 80 DSUB_5V 1N4148 1N4148 4.7K/6 C100 C101 0.1u/6 NC/6 R143 1U/8 4.7K/6 SN7002E VBRI 3DVCC MMBT3906 Title <Title> POWER R144 4.7K/6 Size Document Number Custom <Doc> Date: Friday, October 15, 2004 Sheet DGND Confidential - Do Not Copy ViewSonic Corporation VX924...
  • Page 81 Control Board 11. PCB Layout Diagrams Main Board Confidential - Do Not Copy ViewSonic Corporation VX924...

  • Page 82: Schematic Diagrams

    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) Confidential - Do Not Copy...

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