ViewSonic VA702/b Service Manual
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ViewSonic VA702/b Service Manual

ViewSonic VA702/b Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VA702/b
Model No. VS10781
17" Color TFT LCD Display
(VA702/b_SM Rev. 1a Oct. 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA702/b Model No. VS10781 17” Color TFT LCD Display (VA702/b_SM Rev. 1a Oct. 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

    1. Precautions and Safety Notices 2. Service Tools & Equipment Required 3. Circuit Theory 4. Disassembly & Assembly 5. Test and Adjustment 6. Troubleshooting 7. Recommended Parts List 8. Schematic Diagrams 9. PCB Layout Diagrams Confidential - Do Not Copy ViewSonic Corporation VA702/b...

  • 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 ViewSonic Corporation D o Not Copy VA702/b...
  • 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 ViewSonic Corporation D o Not Copy VA702/b...

  • Page 6: Service Tools & Equipment Required

    6. SOLDER 7. VGA Cable (Black, 15pins point to point) 8. Color Analyzer 9. ISP Board 10. EDID Board 11. FOXISP. EXE file 12. EDID program file 13. Power Adapter output 5V/2A Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 7: Circuit Theory

    Rectifier & OZ9910 LTV817 Filter Circuit AOP605L XTAL1 22.118MHz Transformer2 Open Protection TOP246Y AC Line Filter OPP/OCP 24C02 Keypad VGA Connector Lamp3 Lamp4 AC Socket Connector Keyboard VGA Input AC Input 90V-264V Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 8: Electronic Circuit Theory

    14V not be increased. 2. 2 Inverter circuit 2.2.1 Low voltage to high voltage circuit supplies the power to IC501 through F501; the control signals that BRIGHTNESS and ON/OFF Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 9 #77-#78 are the communications with U105 (MCU) that are connected to #36-#43 of MCU. These communications include HWRESET, CSZ/ALE, SCL/RDZ, SDA/WRZ, and AD0-AD3. 2.3.4 VGA Input Signal R, G, B, SOG input through CN102 #1, #2, #3, and C115, C116, C117 and C118 filtering the Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 10: Factory Preset Timing Table

    70Hz 75.0 58.1kHz 72Hz 78.5 1024 x 768 60.0kHz 75Hz 78.8 68.67kHz 85Hz 94.5 1152 x 870 68.6kHz 75Hz 63.4kHz 60Hz 1280 x 1024 79.97kHz 75Hz 1280 x 720 45kHz 60Hz 74.2 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 11: Ac Outlet Pin Assignment

    6.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent) Symbol Description H.V. High voltage for lamp L.V. Low voltage for lamp 6.2 CN101 (Power BD to Interface BD) Symbol Description +5V (VCC5V) +5.2V output Ground Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 12 Power supply (5.0 V) 6.5 CN102 (D-SUB Connector) Symbol Symbol Symbol Red video input Red GND Green video input Green GND Serial data (SDA) Blue video input Blue GND H / H+V SYNC Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 13 Not connected BUSTYPE Low : Serial bus; High : Direct bus Not connected Not connected Not connected Ground VDDP Digital Output Power Not connected Not connected Not connected Not connected Not connected Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 14 DDR direct bus WRZ; active low RDZ/SCL DDR direct bus RDZ; active low CPU interrupt; 4mA driving strength PWM0; 4mA driving strength PWM0 PWM1; 4mA driving strength PWM1 Not connected Not connected Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 15 B-Link Negative LVDS Differential Clock LVBCKM B-Link Positive LVDS Differential Data LVB2P B-Link Negative LVDS Differential Data LVB2M B-Link Positive LVDS Differential Data LVB1P B-Link Negative LVDS Differential Data LVB1M VDDP Digital Output Power Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 16 DDR Direct Bus Communication with Scaler P0.3/AD3 WRZ line of DDR Direct Bus P0.2/AD2 RDZ line of DDR Direct Bus P0.1/AD1 ALE line of DDR Direct Bus Hardware reset to Scaler P0.0/AD0 +5V for MCU working voltage Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 17: Disassembly &Assembly

    4. DISASSEMBLY &ASSEMBLY 1. Exploded Diagram ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VA702/b...
  • Page 18 EXPLODED PARTS LIST (VA702-1) ViewSonic Model Number: VS10781-1W Rev: 1a Item ViewSonic P/N Ref. P/N Description Q'ty C-00003154 714030002400 ASSY,BEZEL(S),LE1709 E-00003048 631102070270 LCD PANEL 17" MT170EN01-V1(INNOLUX) B-00003041 790411300600 PCBA,IF BOARD, LE1709-6A0 CB-00003155 430303000140 HRN LVDS FFC 30P 234mm,ACCX30234KU28MY B-00003043 790411400600 PCBA,PWR&INV./B, LE1709-6A0...
  • Page 19 EXPLODED PARTS LIST (VA702b-1) ViewSonic Model Number: VS10781-1W Rev: 1a Item ViewSonic P/N Ref. P/N Description Q'ty C-00003173 714030002410 ASSY,BEZEL(G),LE1709 E-00003048 631102070270 LCD PANEL 17" MT170EN01-V1(INNOLUX) B-00003041 790411300600 PCBA,IF BOARD, LE1709-6A0 CB-00003155 430303000140 HRN LVDS FFC 30P 234mm,ACCX30234KU28MY B-00003043 790411400600 PCBA,PWR&INV./B, LE1709-6A0...

  • Page 20: Disassembly Block

    2. Disassembly Block VA702/b (INL PANEL)DIS-ASSEMB LY BLOCK BASE SUB-ASSM *1 BEZEL HINGE COVER*2 BUTTON FUNCTION KEY*1 SUB-ASSM(G/S) (SCREW,P,CROSS,M5*22, Ni*4) FRONT BEZEL (G/S)*1 LED LENS*1 BEZEL SUB-ASSM *1 (SCREW,B,CROSS,T4*10, BLK*4) BACK COVER SUPPORT VESA *1 SUB-ASS’Y HINGE,RIGHT*1 HINGE,LEFT*1 BACK COVER *1...

  • Page 21: Assembly Block

    3. Assembly Block VA702/b (INL panel)ASSEMBLY BLOCK FRONT BEZEL (G/S)*1 LED LENS*1 CHASSIS*1 LOGO PLATE,THREE BRID*1 BUTTON FUNCTION KEY*1 INSULATOR,MYLAR*1 LOGO PLATE BEZEL “VIEWSONIC”*1 SUB-ASSM(G/S IF BOARD*1 POWER BOARD*1 FFC CABLE*1 SUPPORT VESA *1 CLIP,WIRE*1 BACK COVER *1 (SCREW,PW,CROSS,M3*5, Ni*4) (BOLT, #4-40x11.8, Ni*2)

  • Page 22: Test And Adjustment

    Red (+ / -) User Color Green (+ / -) Blue (+ / -) Information Manual Image Adjust H Position (+ / -) H/V Position V Position (+ / -) H Size + / - Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 23 [1] + [▼] 10S(again) Lock NOTICE: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button Locked” Power should only be lockable in the “On State” Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 24 2. If the “EDID Rewrite” process finished, please pull out VGA cable and press ‘’2’’+’’▲’’ at the same time. 3. Pull out AC power cable or press power key to restart. Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 25 Chroma Signal modes and power saving signal. check Generator 2. Confirm the above timing modes must be full screen and the picture must be normal. 3. LED is Orange at power saving mode. Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 26 Contrast: Default generator and Power Check power consumption at each modes meter Power saving Power AC input: State LED color Consumption 230V/50Hz Normal Green ＜38Ｗ Stand By Orange ＜1Ｗ Power Key Off ＜1Ｗ Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 27: Troubleshooting

    This LCM support more than 30 timing modes, if the input timing mode is out of specification, the picture may appears abnormally. If brightness uneven, repairs Inverter circuit or change a new panel. If you find the vertical line or horizontal line lost on the screen, please change panel. Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 28 Check R801, R805, IC802 voltage R822, R823, R817 about 1V Check pin2 of IC802 Check R803, R807, R824, R825 voltage about 2V Check R812, R816, Check pin1 of IC802 C818 voltage is 5.8V Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 29 Check R809, R814, Check reference IC801, R818 voltage of IC801 Check R810, R811 Check C815, D806, Check Vpin3-4 of Check feedback IC801 about 6V R812 circuit Check Vpin1-2 of IC801 about Check R809, R814 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 30: Output Power Is Unstable

    Check R809, R808, R814, D809 Check pin1 of Check D806, C815 if IC802 voltage short is 5.8V Change D806, C815 Check pin3 of Change R801, R805, IC802 voltage R822, R823, R817 about 1V Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 31 Is Ok IC501? U501, U502 fail pin1, pin3, pin15 and pin16 of IC501 at the moment of restart? IC501 fail T501, T502 fail Is ok T501, T502? Check protected circuit Q501, Q502, Q503, Q504 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 32: Black Screen And Backlight Turn On

    6. Black Screen and backlight turn on Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 33: White Screen

    LVDS Cable NG Check VLCD is 5V Check LVDS signals Panel Fail Check Panel-Enable of Check the HWRESET of Check RP101 U105(pin2) is low U104 exists Check Check the pins of Q101,Q102,Q107,R103 U105 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 34: Bad Screen

    LVDS Cable NG 1.Check Check Crystal:pin20,21 of X101,C154,C155 U105 and pin 33,34 of U104 2.Check X102,C126,C168 Check ALE/RDZ/ Check the communication of WRZ/AD0/AD1/AD2/ U104 and U105 AD3/HWRESET Check the pins of U104 and U105 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 35: Recommended Parts List

    7. RECOMMENDED PART LIST RECOMMENDED SPARE PARTS LIST (VA702-1 for "Innolux V1 (12ms) Panel") ViewSonic Model Number: VS10781-1W Rev: 1a Serial No. Prefix: PST Description Item ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty Accessories: KIT,ACCESSORY(INL), LE1709 A-00003039 703000000500...
  • Page 36 RECOMMENDED SPARE PARTS LIST (VA702b-1 for "Innolux V1 (12ms) Panel") ViewSonic Model Number: VS10781-1W Rev: 1a Serial No. Prefix: PSX Description Item ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty Accessories: KIT,ACCESSORY,VA702B-INL,LE1709 A-00003054 703000000510 PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x...
  • Page 37 BOM LIST (VA702-1 for "Innolux V1 (12ms) Panel") ViewSonic Model Number: VS10781 Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty CB-00003047 453010100100 CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 A-00003040 453070800250 PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x #N/A 506250005100...
  • Page 38 BOM LIST (VA702-1 PCB Assemblies) ViewSonic Model Number: VS10781 Rev: 1a Item ViewSonic P/N Ref. P/N Description Location #N/A 790411340600 PCBA,IF BOARD,SMD, LE1709-6A0 VER: AA #N/A 444099030030 CON, SMD 1.0mm 30PIN AL2309-A0G1Z CN103 1 PC #N/A 412000399690 IC FS8860-18PJ SOT-223 (FORTUNE)
  • Page 39 Item ViewSonic P/N Ref. P/N Description Location #N/A 790411440600 PCBA,PWR&INV./B,SMD,LE1709-6A0 #N/A 410500045210 XSTR PMBT3904 NPN 200MA,40V SOT23(PHILIPS) Q801 1 PC #N/A 410500045140 XSTR MMBT3904LT1 NPN 200MA(ON) 40V SOT23 1 PC #N/A 410500045241 XSTR MMBT3904 NPN 200mA,40V(FC SOT23 1 PC #N/A...
  • Page 40 Item ViewSonic P/N Ref. P/N Description Location #N/A 411050005020 DIO BRDG BL4-06-BF52 600V/4A FRONTIER D801 1 PC #N/A 411050007010 DIO BRDG KBL405G 600V/4A(TSC) 1 PC #N/A 416194743011 CAP MEX 0.47uF 275V K X2,F15 C804 1 PC #N/A 416202224610 CAP MEY 2200pF 400V M Y,F10mm...
  • Page 41 BOM LIST (VA702b-1 for "Innolux V1 (12ms) Panel") ViewSonic Model Number: VS10781-1W Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty CB-00003047 453010100100 CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 1 PC A-00003040 453070800250 PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x...
  • Page 42 BOM LIST (VA702-1 PCB Assemblies) ViewSonic Model Number: VS10781 Rev: 1a Item ViewSonic P/N Ref. P/N Description Location #N/A 790411340600 PCBA,IF BOARD,SMD, LE1709-6A0 VER: AA #N/A 444099030030 CON, SMD 1.0mm 30PIN AL2309-A0G1Z CN103 1 PC #N/A 412000399690 IC FS8860-18PJ SOT-223 (FORTUNE)
  • Page 43 Item ViewSonic P/N Ref. P/N Description Location #N/A 790411440600 PCBA,PWR&INV./B,SMD,LE1709-6A0 #N/A 410500045210 XSTR PMBT3904 NPN 200MA,40V SOT23(PHILIPS) Q801 1 PC #N/A 410500045140 XSTR MMBT3904LT1 NPN 200MA(ON) 40V SOT23 1 PC #N/A 410500045241 XSTR MMBT3904 NPN 200mA,40V(FC SOT23 1 PC #N/A...
  • Page 44 Item ViewSonic P/N Ref. P/N Description Location #N/A 411050005020 DIO BRDG BL4-06-BF52 600V/4A FRONTIER D801 1 PC #N/A 411050007010 DIO BRDG KBL405G 600V/4A(TSC) 1 PC #N/A 416194743011 CAP MEX 0.47uF 275V K X2,F15 C804 1 PC #N/A 416202224610 CAP MEY 2200pF 400V M Y,F10mm...

  • Page 45: Schematic Diagrams

    47KΩ C533 100K C534 C532 R524 47KΩ 51KΩ R508 0.1u/50V 0.1u/50V 0.1u/50V 0.1u/50V ViewSonic VA702/b Document Number : SIZE : APPRO BY : R515 R519 R521 R517 TITLE : CHECK BY : Inverter D512 D510 DATE : DRAWN BY :...
  • Page 46 0.1/50V Q103 100uF/16V 0.1/50V PMBT3904 Q102 PANEL_ENABLE PMBT3906 R103 R169 Q107 PMBT3904 VA702/b ViewSonic Document Number : SIZE : APPRO BY : TITLE : CHECK BY : DC INPUT DATE : DRAWN BY : Rev : SHEET Confidential - Do Not Copy...
  • Page 47 33p/50V 220p/50V DDC_SDA_VGA R127 R126 R125 DDC_SCL_VGA R124 D103 PC5V_VGA SN4148 U103 D104 VCC5V VA702/b C124 AT24C02N-10SI ViewSonic SN4148 0.1/50V Document Number : SIZE : APPRO BY : TITLE : CHECK BY : VGA_INPUT DATE : DRAWN BY : Rev :...
  • Page 48 VAA4 XOUT C168 FB107 22p/50V BEAD60OHM C144 C145 10u/16V 0.1/50V Note: U104 pin4,5,7~9,12~17,22~27,75,76,79~83,88~93,98~101 are all NC (open) VA702/b ViewSonic Document Number : SIZE : APPRO BY : TITLE : CHECK BY : SCALER DATE : DRAWN BY : Rev :...
  • Page 49 RXO3+ RXE0- RXE0+ RXE1- RXE1+ RXE2- RXE2+ RXEC- RXEC+ RXE3+ RXE3- VLCD VA702/b ViewSonic Document Number : SIZE : APPRO BY : TITLE : CHECK BY : PANEL INTERFACE DATE : DRAWN BY : Rev : SHEET Confidential - Do Not Copy...
  • Page 50 R145 X101 R158 C154 C155 22.1184MHz 12p/50V 12p/50V Q105 PMBT3906 LED_ORANGE R159 VA702/b ViewSonic Document Number : SIZE : APPRO BY : TITLE : CHECK BY : DATE : 2005-05-11 DRAWN BY : Rev : SHEET Confidential - Do Not Copy...

  • Page 51: Pcb Layout Diagrams

    9. PCB Layout Main board Top layout Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 52 Main board bottom Layout Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 53: Power Board

    POWER board Confidential ViewSonic Corporation D o Not Copy VA702/b...
  • Page 54 Confidential ViewSonic Corporation D o Not Copy VA702/b...

  • Page 55: Pcb Layout 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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