ViewSonic VA702-3 Service Manual
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ViewSonic VA702-3 Service Manual

ViewSonic VA702-3 Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VA702-3
VA702b-3
Model No. VLCDS27998-3W
VLCDS27998-4W
17" Color TFT LCD Display
(VA702-3_VA702b-3_SM Rev. 1a May 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583

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Summary of Contents for ViewSonic VA702-3

  • Page 1: Service Manual

    Service Manual ViewSonic VA702-3 VA702b-3 Model No. VLCDS27998-3W VLCDS27998-4W 17” Color TFT LCD Display (VA702-3_VA702b-3_SM Rev. 1a May 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 VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the chance of a shock hazard . AC VOLTMETER 0.15u 1500 To Metal Parts Earth Ground ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 5 Take out the monitor with cushion That may cause “ MURA“. Place the monitor on foreign objects . Place the monitor on a clean & soft foam pad . That could scratch the surface of panel ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 6: Specification

    Leakage Current Efficiency 70 % TYPICAL AT 115VAC FULL LOAD INTERNAL AND NOT USER REPLACEABLE Fuse 36 WATTS (MAX) Power Dissipation 1.2 ARMS @ 90VAC, 0.8 ARMS @180VAC Max Input AC Current ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 7: Electrical Requirements

    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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 8 20’/40’ Container Loading, Palletized 720/1728 pieces Ergonomics Tilt Up 20 DEGREES MINIMUM Tilt Down -5 degrees Swivel Right 0 degrees Swivel Left 0 degrees Height Adjust 0 mm 0 DEGREES (CLOCKWISE) Pivot ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 9 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 VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 10: Front Panel Function Control Description

    Green = ON Also a shortcut to auto image adjust Contrast adjustment control screen. Orange=power saving Displays the Main Menu or Power On / Off exits the control screen and saves adjustments. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 11: Main Menu Controls

    ViewSonic VE702/b -3 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 12: Circuit Description

    MNEMONI SIGNAL 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 13 3.4.3 Input impedance Video input : 75 ohms Sync input : > 1 k ohms SIGNAL CABLE : Signal cable with Mini D-Sub 15P connectors at both ends. Length : 1.8 meter. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 14 Time: 15:03:33 Date: Wed Oct 19, 2005 ______________________________________________________________________ ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VA702-3SERIES ______________________________________________________________________ ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63...
  • Page 15 Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VA702-3SERIES (126) No Extension EDID Block(s) (127) CheckSum OK ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 16 Time: 15:33:23 Date: Wed Oct 19, 2005 ______________________________________________________________________ ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VA702-3SERIES ______________________________________________________________________ ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63...
  • Page 17 IC functions required for LCD panel. On-chip functions include a high-speed triple-ADC , PLL, high scaling engine, OSD controller. a) Clock Generation : Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and corresponding logic. A ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 18 6.1.2 Power Regulator MC34063A (U6),AIC1739 (Q4) : The MC34063A is a monolithic control IC containing the primary functions required for DC to DC converters. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 19 Volt = 1.25 ( 1 + R85 / R86), In this case, the output voltage are 5.0 Volts for panel power. 6.2 Power(Inverter) Board This is a specific power(inverter) power board for VA702-3 monitor 40W 12V 3.5A output power and backlight which converters 12 Vdc to drive four cold cathode fluorescence tubes.

  • Page 20: Adjustment Procedure

    Press “1” Button to exit User Color item. Red,Green,Blue Options: Press “2” Button to switch among the options. Press “1” Button to exit the options. Press Up Button to make current option high. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 21 Press Down Button to make current item low. 4) Sharpness Item Press “2” Button to enter Sharpness item. Press “1” Button to exit Sharpness item. Press Up Button to make current item high. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 22 Press “1” Button to exit Vertical Position option. Press Up Button to make current option high. Press Down Button to make current option low 4) OSD Time Out Item Press “2” Button to enter OSD Time Out item. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 23 Press “2” Button to enter the Brightness Dialog. Press Up Button to make contrast high. Press Down Button to make contrast low. (2) Auto Image Adjust Dialog Press “2” Button to do the auto image adjust function. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 24 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 25 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 26 Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 27 If not , please following procedure to upgrade to the latest version . Equipment needed : VA702/b-3 PC ( Personal computer ) LPT cable Fixture (LM5ISP) Firmware upgrade program Print port Fixture VA702/b- LPT cable Connection : To PC To monitor ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 28 Appendix A : How to install the software for ISP : ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 29 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 30 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 31 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 32 2.1 After installation , we could find the shortcut in the setting path or the program bar ( default setting ) , see Fig 2.1 . 2.2 Security file is a key to use ISP function , press “ ½T©w “ button , see Fig 2.2 . ViewSonic Corporation VA702-3_VA702b-3...
  • Page 33 (it’ s limited by IIC protocol ) , press “ ½T©w “ button , see Fig 2.3 . 2.4 Press “ Create Security File “ button to key in Security code. Adjusting bar to decrease speed of IIC bus , See Fig. ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 34 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 . ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 35 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 . ViewSonic Corporation VA702-3_VA702b-3...
  • Page 36 4.1 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 “RUN” button , the MCU content will show as Fig4.1 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 37 5 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 38 (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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 39 1.3 Put the cushion on the monitor (Figure.3) 1.4 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 VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 40 2.4 Take of the screws (Figure 8) Figure 7 Figure 8 2.5 Remove the back cover (Figure 9) 2.6 Take off the screw on the VGA cable (Figure 10) Figure 9 Figure 10 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 41 Figure 13 Figure 14 2.11 Take out the screws on M/B & remove the cable between M/B & power board (Figure 15) 2.12 Remove the M/B out (Figure 16) Figure 15 Figure 16 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 42 2.15 Separate the bezel & panel (with BKT) & remove the cable on panel (Figure 19) 2.16 Take off the L/R BKT & remove the L/R BKT . (Figure 20) Figure 19 Figure 20 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 43: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart 1. No Power ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 44 2. No Characters , Missing Color 3 Always show NO SIGNEL ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 45: Recommended Spare Parts List

    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 46 BOM LIST (VA702-3) ViewSonic Model Number: VLCDS27998-3W Rev: 1a Serial No. Prefix: Q5K Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 1L7VCAXVS04 L7VC-A2 LCD MONITOR(VA702-3,TWN)S/B B-MB-0201-2765 29L7VMB00A8 L7VC M/B ASSY(QDI)LVDS 3BL7VSS0068 L7VC M/B S/S ASSY(QDI)LVDS CC62204MD23 CAP EC 22U 25V(+-20%,105C,5*11,2KHR)GP...
  • Page 47 BOM LIST (VA702b-3) ViewSonic Model Number: VLCDS27998-4W Rev: 1a Serial No. Prefix: Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 1L7VCAXVS12 L7VC-A2 LCD MONITOR(VA702B-3,TWN)B B-MB-0201-2765 29L7VMB00A8 L7VC M/B ASSY(QDI)LVDS 3BL7VSS0068 L7VC M/B S/S ASSY(QDI)LVDS C17,C25,C28,C30,C33,C36, CC62204MD23 CAP EC 22U 25V(+-20%,105C,5*11,2KHR)GP...

  • Page 48: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Model Exploded diagram Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 49 EXPLODED PARTS LIST (VA702-3) ViewSonic Model Number: VLCDS27998-3W Rev: 1a Serial No. Prefix: Q5K Item ViewSonic P/N Ref. P/N Description Q'ty B-MB-0201-2765 29L7VMB00A8 L7VC M/B ASSY B-SB-0221-0686 AS020126104 ADP/INV ADP-40AFB, 90-264VAC B-CB-0206-0170 23L7VBB0026 L7VC BUTTON/B ASSY EAL7V012049 LCD BEZEL L7VC...
  • Page 50 EXPLODED PARTS LIST (VA702b-3) ViewSonic Model Number: VLCDS27998-4W Rev: 1a Serial No. Prefix: Q5L Item ViewSonic P/N Ref. P/N Description Q'ty 29L7VMB02X9 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 C-FP-0301-1066 EAL7V012014 LCD BEZEL SILVER L7VC...
  • Page 51 PACKING PART LIST ( VA702-3 / VA702b-3 ) ViewSonic Model Number: VLCDS27998-3W/4W Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 1L7VCAXVS12 VA702b-3 P-FM-0602-0840 HBL7V005019 END CAP (L) P-FM-0602-0841 HBL7V006015 END CAP (R) DC-00005789 HGL7VC07010 QSG+CD A-00005252 DM333181G97 POWER CORD 3P 1.8M...

  • Page 52: Block Diagram

    9. Block Diagram 1. System block ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 53 2. Power MC34063 2.5V AIC1739 3.3V MC34063 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 54: Schematic Diagrams

    ANALOG RGB LCDVCC POWER +3.3V EEPROM +3.3V +3.3V 24LC16 MICRO-CONTROLLER MTV312 AC 100-240Vac POWER INVERTER +12V 34063 +3.3V AIC1739 +2.5V AND AUDIO BOARD ViewSonic Corporation +5.0V 34063 Model BLOCK DIAGRAM Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 55 TX0- 4 RX0- TX0+ TX0+ 4 RX0+ Z5.6/NS Z5.6/NS RX5- RX5+ TXC+ TXC+ 4 RXC+ TXC- TXC- 4 RXC- ViewSonic Corporation 0.1U/6NC Z5.6/NC 1U/6NC Z5.6/NC Z5.6/NC Z5.6/NC Z5.6/NC 10K/6NC Model VGA AND TMDS INPUT DVI-D/NC Title Date Rev: ViewSonic Corporation...
  • Page 56 POL 6 XOUT GPO0 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 SCALAR Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 57 VCC12 1K/6 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 / BOTTON CONTROL Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 58 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 0.1U/6/NC 0.1U/6/NC MTH276D126 MTH276D126 Model Panel interface Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...
  • Page 59 HDK632A 4500-10-8P-R HDK632A HDK632A green HDK632A LED1 EL-209-2EGW orange HDK632A LED1 ViewSonic Corporation Model BUTTON-BOARD Title Date Rev: ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 60: Pcb Layout Diagrams

    11. PCB Layout Diagrams BUTTON 0 BUTTON 1 ViewSonic Corporation VA702-3_VA702b-3 Confidential - Do Not Copy...

  • Page 61: Viewsonic Corporation

    Company: 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 VA702-3_VA702b-3 Confidential - Do Not Copy...

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