ViewSonic VA902B - 19" LCD Monitor Service Manual
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ViewSonic VA902B - 19" LCD Monitor Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VA902/b
Model No. VS10780
19" Color TFT LCD Display
(VA902/b_SM Rev. 1a Oct. 2005 )
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VA902B - 19" LCD Monitor

  • Page 1: Service Manual

    Service Manual ViewSonic VA902/b Model No. VS10780 19” Color TFT LCD Display (VA902/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 VA902/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 - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 8: Electronic Circuit Theory

    R528, R523, R524 make up of a voltage divided circuit. C504 is used to filter the high frequency noise. The operation frequency is determined by R522 and C529. For BURST MODE, its Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 9 D104.U103 is an EEPROM IC, which is a kind of memory and used for saving EDID data. 2.3.5 Button Control Button “Key-Power” is defined as power on/off, which is connected to U105 #24 through CN106 #4. Confidential - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 10: Factory Preset Timing Table

    If Power ON, U105 #6 (LED_Green) will send out High potential, and then LED green on. If Power OFF, U105 #7 (LED_Orange) will send out High potential, and then LED Orange on. The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency. Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 11 OSD “▲” control to adjust value to increase KEY_POWER DC power on/off control KEY_DOWN OSD “▼” control to adjust value to decrease LED_GREEN Green LED lighting control Ground LED_ORANGE Orange LED lighting control Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 12 Symbol Red video input Red GND Green video input Green GND Serial data (SDA) Blue video input Blue GND H / H+V SYNC +5V(from PC) VSYNC Cable Detect Data clock line (SCL) Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 13 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 Not connected VDDC Digital Core Power Ground Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 14 Ground ALE/CS DDR direct bus ALE; active high WRZ/SDA DDR direct bus WRZ; active low RDZ/SCL DDR direct bus RDZ; active low CPU interrupt; 4mA driving strength PWM0 PWM0; 4mA driving strength Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 15 LVA1M A-Link Positive LVDS Differential Data Output LVA0P A-Link Negative LVDS Differential Data Output LVA0M VDDP Digital Output Power Ground Ground VDDC Digital Core Power B-Link Positive LVDS Differential Data Output LVB3P Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 16 B-Link Negative LVDS Differential Data Output LVB2M B-Link Positive LVDS Differential Data Output LVB1P B-Link Negative LVDS Differential Data Output LVB1M VDDP Digital Output Power Ground B-Link Positive LVDS Differential Data Output LVBOP Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 17 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 - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 18: Disassembly & Assembly

    4. Disassembly & Assembly 1. Exploded Diagram and Spare Parts List ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 19 EXPLODED PARTS LIST (VA902/b-1) ViewSonic Model Number: VS10780-1W Rev: 1a Serial No. Prefix: PSS / PSW Item ViewSonic P/N Ref. P/N Description Q'ty C-00003659/C-00003677 714030002500/10 Bezel Sub-assm,VA902/b #N/A 506102000400 LOGO PLATE,VIEWSONIC,LE1709(THREE BIRDS) #N/A 506102000300 LOGO PLATE, VIEWSONIC,LE1709 #N/A 501010202900/10 BEZEL,FORNT,LE1909(Silver877C)/(Midnight Gray)

  • Page 20: Disassembly Block

    (SCREW,PW,CROSS,M3*5, Ni*4) (Ace tape*1) HSD or QDI PANEL*1 BRACKET_L*1 (SCREW,PW,CROSS,M3*5, Ni*4) IF BOARD*1 POWER BOARD*1 FFC CABLE*1 CLIP,WIRE*1 CHASSIS*1 (SCREW,PW,CROSS,M3*5, Ni*4) (BOLT, #4-40x11.8, Ni*2) INSULATOR,MYLAR*1 NOTE: The arrow is the direction of disassembly. Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 21 HINGE COVER*2 HINGE,LEFT*1 (SCREW,F,CROSS,T4*10, Ni*4) S/N LABEL*1 QC LABEL*1 HI POT LABEL*1 BEZEL SUB-ASSM *1 ID LABEL*1 (SCREW,P,CROSS,T4*12, BLK*4) V19 LCD MONITOR FINAL ASM NOTE: The arrow is the direction of assembly. Confidential - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 22: Test And Adjustment

    [1] + [▼] + [▲] White Balance (Not shown on user’s guide) [1] + [▼] Power Lock [1] + [▲] OSD Lock Remark : All the short cuts function are only available while OSD off Confidential - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 23: Osd Control

    When the OSD is locked will lock all functions. Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD Locked” OSD Lock should not lock Power Button and Power Lock function Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 24 - Press” [▼] +[▲] +[ ] “simultaneously to enter factory mode. - Press ‘’Menu[1]’’, then press ‘’Auto[2]’’ to execute Auto color item. - After the “Auto Color” process finished, please press “Power” to restart monitor. Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 25 7.3 8051ispwriter.exe will detect automatically which MCU used in this monitor. Do it as the order shown on the screen, choose the corresponding firmware version, and load to MCU. 7.4 After finish, please plug out power cable and re-start monitor again. Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 26 Contrast: Default and Power meter Check power consumption at each modes Power saving AC input: 230V/50Hz State Power Consumption LED color Normal Green ＜40Ｗ Stand By Orange ＜1Ｗ Power Key Off ＜1Ｗ Confidential - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 28 Check R801, R805, IC802 voltage R822, R823, R817 about 1V Check R803, R807, Check pin2 of IC802 voltage about 2V R824, R825 Check R812, R816, Check pin1 of IC802 C818 voltage is 5.8V Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 29 Check R809, R814, voltage IC801, R818 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 - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 30 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 - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 32 Black Screen and backlight turn on Confidential - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/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 - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 35: Recommended Parts List

    7. RECOMMENDED PART LIST RECOMMENDED SPARE PARTS LIST (VA902-1) ViewSonic Model Number: VS10780-1W Rev: 1a Serial No. Prefix: PSS Description Item ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty Accessories: Power Cord (Australia) A-00003671 453070800420R Power Cord (British) A-00003675...
  • Page 36 RECOMMENDED SPARE PARTS LIST (VA902b-1) ViewSonic Model Number: VS10780-1W Rev: 1a Serial No. Prefix: PSW Item Description ECR/ECN ViewSonic P/N Ref.P/N Location Universal number# Q'ty Accessories: Power Cord (Australia) A-00003671 453070800420R Power Cord (British) A-00003675 453070800230R Power Cord (CCC) A-00003676...
  • Page 37 BOM LIST (VA902-1 for "Hannstar (8ms) Panel") ViewSonic Model Number: VS10780-1W Rev: 1a Serial No. Prefix: PSS Item ViewSonic P/N Ref. P/N Description Location Qty. #N/A 506250005001 LBL,AGENCY(VA902), LE1909.CCC MARK For VSCN &VSI & VSE &VSE-UK 1 PC #N/A 506440002300 LABEL,BLANK,76.2x76.2mm,LE1709(UPC)
  • Page 38 1 PC #N/A 506102000300 LOGO PLATE,VIEWSONIC, LE1709 For VSCN &VSI & VSE &VSE-UK 1 PC #N/A 506102000500 LOGO PLATE,VIEWSONIC, LE1709(ELLIPSE) For VSCN &VSI & VSE &VSE-UK 1 PC #N/A 506390210100 LABEL,CARTON(8ms),LE1709,L89xW58mm For VSCN &VSI & VSE &VSE-UK 1 PC TAPE,WRAPPING...
  • Page 39 #N/A 506102000400 BIRDS For VSA 1 PC #N/A 506102000300 LOGO PLATE,VIEWSONIC, LE1709 For VSA 1 PC #N/A 506102000500 LOGO PLATE,VIEWSONIC, LE1709(ELLIPSE) For VSA 1 PC #N/A 506390210100 LABEL,CARTON(8ms),LE1709,L89xW58mm For VSA 1 PC Confidential ViewSonic Corporation D o Not Copy VA902/b...
  • Page 40 Item ViewSonic P/N Ref. P/N Description Location Qty. TAPE,WRAPPING #N/A 506380002100 TYPE(VIEWSONIC),50mmx75M,LE1709 For VSA 0.0083 ROL #N/A 506431002050 FILM,PROTECTION,UNPRINTED,LE1909/18 For VSA 0.1 PC Confidential ViewSonic Corporation D o Not Copy VA902/b...
  • Page 41 APPRO BY : VCC5V 0921341041 BRIGHTNESS ON/OFF TITLE : P801 CHECK BY : POWER SUPPLY C821 AC IN 0.1u/50V TO SCALER BD CN101 DATE : 2005-06-02 DRAW N BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 42 R531 0921341041 R532 R533 R534 TITLE : CHECK BY : NOTE: Inverter 紅色粗線:表示高電壓迴路; D509 D511 D510 D512 1N4148W 紅色虛線:表示易發熱元件; 1N4148W 1N4148W DATE : 2005-07-15 DRAWN BY : 1N4148W 橘色粗線:表示大電流迴路; Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 43 Q107 ViewSonic VA902/b InnoLux LE1909 (VA902/b) PMBT3904 Document Number : SIZE : APPRO BY : 0921341040 TITLE : CHECK BY : DC INPUT DATE : 2005-06-07 DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 44 LE1909 (VA902/b) U103 D104 VCC5V C124 AT24C02N-10SI SN4148 Document Number : SIZE : APPRO BY : 0.1/50V 0921341040 TITLE : CHECK BY : VGA_INPUT DATE : 2005-06-07 DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 45 LE1909 (VA902/b) Document Number : SIZE : APPRO BY : 0921341040 Note: U104 pin4,5,7~9,12~17,22~27,75,76,79~83,88~93,98~101 are all NC (open) TITLE : CHECK BY : SCALER DATE : 2005-06-07 DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 46 RXE3+ InnoLux LE1909 (VA902/b) ViewSonic VA902/b VLCD Document Number : SIZE : APPRO BY : 0921341040 TITLE : CHECK BY : PANEL INTERFACE 2005-06-07 DATE : DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 47 Q105 PMBT3906 LED_ORANGE InnoLux LE1909 (VA902/b) ViewSonic VA902/b R159 Document Number : SIZE : APPRO BY : 0921341040 TITLE : CHECK BY : DATE : 2005-06-07 DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 48 MENU/1 AUTO/2 POWER DOWN InnoLux LE1909(VA902/b) ViewSonic VA902/b Document Number : SIZE : APPRO BY : 0921341039 TITLE : CHECK BY : KEYPAD 2005-06-02 DATE : DRAWN BY : Rev : SHEET Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 49 9. PCB Layout Main board Top layout Confidential - Do Not Copy ViewSonic Corporation VA902/b...
  • Page 50 POWER board Confidential - Do Not Copy ViewSonic Corporation VA902/b...

  • Page 51: 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...

This manual is also suitable for:

Vs10780Va902/bVa902-1Va902b-1

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