ViewSonic VA721-2 Service Manual
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ViewSonic VA721-2 Service Manual

ViewSonic VA721-2 Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VA721-2
Model No. VLCDS 27998-5W
17" Color TFT LCD Display
(VA721-2_SM Rev. 1a Jan. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VA721-2

  • Page 1: Service Manual

    Service Manual ViewSonic VA721-2 Model No. VLCDS 27998-5W 17” Color TFT LCD Display (VA721-2_SM Rev. 1a Jan. 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 VA721-2...

  • 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 VA721-2...
  • 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 VA721-2...
  • Page 6 "MURA." Do not touch the surface of the polarizer . If the monitor is removed by grasping the LCD Take out the monitor by grasping the cushion. panel, that may cause "MURA." ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 7 Correct methods : Incorrect Methods : If the monitor is placed on foreign objects, Place the monitor on a clean & soft foam pad . that could scratch the surface of the panel. ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 8: Specification

    3.5mA (Max) at 254VAC / 60Hz EFFICIENCY 70 % typical at 115VAC Full Load Fuse Internal and not user replaceable Power Dissipation 35 Watts (typ) Max Input AC Current 1.2 Arms @ 90VAC, 0.8 Arms @180VAC ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 9 400), there is no “Auto Adjust” feature. 3) The monitor needs to do “Auto Adjust” the first time a new mode is detected. Mode Change Image The image shall blank while the monitor changes modes. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 10 16.2 million colors Viewing Angle (Horizontal, typ) 140 deg @ CR>10 Viewing Angle (Vertical, typ) 125 deg @ CR>10 Response Time 8 ms (Typ) 10%-90% @ Ta=25°C Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 11 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 ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 12: Front Panel Function Control Description

    Green = ON Contrast adjustment control Orange = Power Saving screen. Also a shortcut to Auto Image Adjust. Displays the Main Menu Power or exits the control screen On/Off and saves adjustments. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 13 • 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 dislay.) ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 14 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 15 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 graphic card's user guide for instructions on changing the resolution and refresh rate (vertical frequency).
  • Page 16 OSD Timeout screen is displayed. For example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 17 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • 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 VA721-2...
  • Page 19 H/V Separate: TTL level 3.4.3 Input impedance Analog video input: 75 ohm Sync input: > 1 k 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 VA721-2...
  • Page 20 Time: 09:10:39 Date: Wed Jan 19, 2005 ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VE710s ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63...
  • Page 21 Sync Pulse Width: 3 lines Border: 0 lines Frequency: 60.02 Hz Digital Separate, Horizontal Polarity (+) Vertical Polarity (+) ______________________________________________________________________ (72-89) Detailed Timing / Descriptor Block 2: Monitor Serial Number: A33050100001 _________________________________________________________ ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 22: ______________________________________________________________________

    Time: 09:10:09 Date: Wed Jan 19, 2005 ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VE710b ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63...
  • Page 23 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) ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 24 Max Horiz. Freq - 80 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VE710b (126) No Extension EDID Block(s) (127) CheckSum OK ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 25 Blue + Blue - c) OSD: The MST8111A 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 26 The desired output voltage is determined by the equation, Volt = 1.25 ( 1 + R85 / R86). In this case, the output voltage is 5.0 Volts for panel power. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 27 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 ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 28: 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 29 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 30 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. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 31 Press the [2] button to enter the Contrast Dialog. Press the [▲] button to increase the brightness. Press the [▼] button to decrease the brightness. (3) Analog/Digital Dialog Press the [2] button to toggle between analog and digital modes. ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 32 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) ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 33 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 VA721-2...
  • Page 34 Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 35 1. Equipment needed : VE710s/b PC ( Personal computer ) LPT cable Fixture (LM5ISP) Firmware upgrade program Print port Fixture VE710s/b LPT cable 2. Connection : To PC To monitor ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 36 7. Appendix A : How to install the software for ISP : ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 37 1.2 After extracting the ZIP file , the total files list as Fig 1.2 , and double click the file of setup.exe to install. 1.3 Press “ Next “ button to continue., see Fig 1.3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 38 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 1.4 . 1.5 Press “ Install “ button to continue , see Fig 1.5 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 39 1.6 The installer Information shows package warning , Press “ Ignore “ button to continue .see Fig 1.6 . 1.7 Installation has finished , press “ Finish “ button , see Fig 1.7 . Fig. 1.7 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 40 8.1. After installation, shortcuts may be found in the settings path or the program menu (default setting); see Fig 2.1 8.2 The security file is a key to use ISP functions; press the "OK" button. See Fig 2.2. ViewSonic Corporation Confidential - Do Not Copy...
  • Page 41 ISP functions to fail; press the "OK" button. Press “ Create Security File “ button to key in Security code . Adjusting bar to decrease speed of IIC bus , See Fig. 2.4 . ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 42 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. ViewSonic Corporation Confidential - Do Not Copy...
  • Page 43 9.3 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 . ViewSonic Corporation Confidential - Do Not Copy...
  • Page 44 1 0 . 1 Only software ISP could read the MCU content , it is according to program the boot code while coding . The limitation is used for the security of customer ’ s code. Select “ Read Target “ item , and press "button" , the MCU content will show as Fig4.1 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 45 11. Re-entry the ISP Mode When you couldn’ t select or click “ Reset MCU “ button and enter ISP mode again , you’ ll see the message as below : ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 46 (2) If you using the MTV312M64 or before MCU serials , the MCU will always in “ ISP Mode “ even Programming fail or erase MCU that instead of select or press “ Reset MCU “ ViewSonic Corporation Confidential - Do Not Copy...

  • Page 47: Packing Procedure

    11.3 Put the cushion on the monitor (Figure.3) 11.4 Put the monitor into carton & put all the accessories into the carton .Then close the carton . (Figure.4) (Figure 3) (Figure 4) Power cord ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 48 12.2 Lay VE710s/b down & take off the screws to remove the base (Figure 6) (Figure 5) (Figure 6) 12.3 Remove the screw cover (Figure 7) 12.4 Take of the screws (Figure 8) Figure 7 Figure 8 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 49 12.9 Tear off the AL-foil , all cables on M/B & lamp wires . (Figure 13) 12.10 Take off the screws on the PCB holder & remove the PCB holder with the boards . (Figure 14) Figure 13 Figure 14 ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 50 12.15 Separate the bezel & panel (with BKT) & remove the cable on panel (Figure 19) 12.16 Take off the L/R BKT & remove the L/R BKT . (Figure 20) Figure 19 Figure 20 ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 51: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart 1. No Power ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 52 2. No Characters , Missing Color 3 Always show NO SIGNEL ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 53: Recommended Spare Parts List

    7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VA721-2) ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Universal Panel Sources Item Description ECR/ECN ViewSonic P/N Ref. P/N Location Number# QDI V.9 QDI V.11 POWER CORD A-PC-0106-0306 DM333181S01...

  • Page 54: Viewsonic Corporation

    BOM LIST (VA721-2 for "CPT") ViewSonic Model Number: VLCDS27998-5W Rev: 1a Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 1L7VCZCVSE3 L7VC-A LCD MONITOR (CPT,CHINA)SILVER #N/A 29L7VCMB083 L7VC M/B ASSY(FOR L7VC-CL)CPT,MST8111A S #N/A 3BL7VSS0068...
  • Page 55 BOM LIST (VA721-2 for "QDI Panel V.9") ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 1L7VCZXVS02 L7VC-A1 LCD MONITOR(QDI-V09/SILVER)CHN #N/A 29L7VCMB0J8 L7VC M/B ASSY(QDI ,V09)MST8111A/L7VC-A1 #N/A 3BL7VSS0068...
  • Page 56 HCL7V004013 CORE LABEL(HCL7V004,REV3A)GP #N/A HCL7VC04017 IDLABEL(VA721-2)L7VC-A(HCL7VC04,REV3A)GP M-LB-0813-0745 HCL7V002011 SERIAL LEBAL L7V(HCL7V002,REV3A) GP M-LB-0813-0746 HCL7V003017 CARTON LEBAL(HCL7V003,REV3A)GP P-00004816 HFL7VC03013 CARTON VA721-2 L7VC-A(HFL7VC03,REV3A)GP DC-00005179 HGL7VC04011 QSG+CD VA721(Q) L7VC-A1(REV3A)GP #N/A JXLM5003011 HANDLE LM5S(JXLM5003,REV 3B) GP #N/A HFL7V009018 SPACE PLATE L7VC(HFL7V009,REV3B)GP 0.028 M-MS-0808-7399 JXL7V003017...
  • Page 57 BOM LIST (VA721-2 for "QDI Panel V.11") ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty #N/A 1L7VCZXVS11 L7VC-A1 LCD MTR(SILVER)CHN GP #N/A 21L7VCMB001 L7VC M/B ASSY(MST8111A) GP #N/A...
  • Page 58 Description Location Universal number# Q'ty #N/A HCL7VC04017 IDLABEL(VA721-2)L7VC-A(HCL7VC04,REV3A)GP M-LB-0813-0745 HCL7V002011 SERIAL LEBAL L7V(HCL7V002,REV3A) GP M-LB-0813-0746 HCL7V003017 CARTON LEBAL(HCL7V003,REV3A)GP CARTON VA721-2 L7VC-A(HFL7VC03,REV3A)GP P-00004816 HFL7VC03013 DC-00005179 HGL7VC04011 QSG+CD VA721(Q) L7VC-A1(REV3A)GP #N/A JXLM5003011 HANDLE LM5S(JXLM5003,REV 3B) GP #N/A HFL7V009018 SPACE PLATE L7VC(HFL7V009,REV3B)GP 0.028...
  • Page 59 8. Exploded Diagram And Spare Parts List ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 60 EXPLODED PARTS LIST (VA721-2 for "CPT") ViewSonic Model Number: VLCDS27998-5W Rev: 1a Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 29L7VCMB083 L7VC M/B ASSY B-SB-0221-0686 AS020126104 ADP/INV ADP-40AFB, 90-264VAC B-CB-0206-0170 23L7VBB0026 L&VC BUTTON/B ASSY #N/A EAL7V012031...
  • Page 61 EXPLODED PARTS LIST (VA721-2 for "QDI Panel V.9") ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 29L7VCMB083 L7VC M/B ASSY B-SB-0221-0686 AS020126104 ADP/INV ADP-40AFB, 90-264VAC B-CB-0206-0170 23L7VBB0026 L&VC BUTTON/B ASSY...
  • Page 62 EXPLODED PARTS LIST (VA721-2 for "QDI Panel V.11") ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N Description Q'ty #N/A 21L7VCMB001 L7VC M/B ASSY B-SB-0221-0686 AS020126104 ADP/INV ADP-40AFB, 90-264VAC B-CB-0206-0170 23L7VBB0026 L&VC BUTTON/B ASSY...
  • Page 63 DM333181G97 POWER CORD 3P 1.8M P-00004816 HFL7VC03013 CARTON VA721-2 M-LB-0813-0746 HCL7V003017 CARTON LABEL #N/A HAL7V003015 PE BAG PACKING PARTS LIST (VA721-2 for "QDI Panel V.9") ViewSonic Model Number: VLCDS27998-5W Rev: 1b Serial No. Prefix: PX2 Item ViewSonic P/N Ref. P/N...
  • Page 64 1. System block DDC-SCL DDC-SDA HSYNC / VSYNC Triple ADC Analog AR , AG, AB Interface MST8111A LVDS1+ / LVDS1- Panel Crystal Clock LVDS2+ / LVDS2- 17” Panel Backlight Gen. Interface 14.318MHz CLK+ / CLK- SCL/SDA Panel EEPROM Interface Host 24C08 Control Interface...
  • Page 65 2. Power MC34063 2.5V AIC1739 3.3V MC34063...

  • Page 66: Viewsonic Corporation

    LVDS) ANALOG RGB LCDVCC POWER +3.3V EEPROM +3.3V +3.3V 24LC16 MICRO-CONTROLLER MTV312 POWER INVERTER 34063 AIC1739 AC 100-240Vac +12V +3.3V +2.5V AND AUDIO BOARD +5.0V 34063 ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 67 HP-MCU 5 TX0- TX0- 4 RX0- TX0+ TX0+ 4 RX0+ RX5- RX5+ TXC+ TXC+ 4 RXC+ TXC- TXC- 4 RXC- ViewSonic Corporation 0.1U/6NC Model VGA AND DVI INPUT Z5.6/NC 1U/6NC Z5.6/NC Z5.6/NC Z5.6/NC Z5.6/NC 10K/6NC Title Date Rev: DVI-D/NC ViewSonic Corporation...
  • Page 68 GPO1 22/6/NC XSTB 6 GPO1 22P/6 GPO2 YDIO 6 GPO2 XTAL 0.1U/6 GPO3 YCLK 6 BYPASS GPO3 GPO4 YOE 6 AVSS_LPLL GPO4 ViewSonic Corporation Model VGA AND DVI INPUT Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 69 1K/6 C101 VCC12 1U/6 0.1U/6 10K/6/NC VDD3V3 6.8K/6 VDD3V3 1K/6 VDD2V5 PWR_SEL 10K/6 VOUT R112 2K/6 ViewSonic Corporation 1U/8 SN7002E 0.1U/6 0.1U/6 BRIGHTNESS 4 AIC1739 Model MCU & BUTTOM Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 70 FR2N BR0P FR2P BR0N FXDIO AF730B-A2G1T/NC XSTB BXDIO YCLK YDIO LCDVDD 0/8/NC 0/8/NC 0/8/NC 0/8/NC MTH276D126 MTH276D126 LCDVCC 0/8/NC ViewSonic Corporation AF750B-A2G1T/NC Model PANEL INTERFACE 0.1U/6/NC 0.1U/6/NC MTH276D126 MTH276D126 Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 71 HDK632A 4500-10-8P-R HDK632A HDK632A green HDK632A LED1 EL-209-2EGW orange HDK632A LED1 ViewSonic Corporation Model BUTTOM Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA721-2...
  • Page 72 11. PCB Layout Diagrams Main board Control board ViewSonic Corporation Confidential - Do Not Copy VA721-2...

  • Page 73: Exploded Diagram And Exploded Parts List

    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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