ViewSonic VA703b Service Manual
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ViewSonic VA703b Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VA703b / VA703m
Model No VS11280
17" Color TFT LCD Display
Manufacture Date: May-10-06
- 1 –
ViewSonic Corporation
Confidential - Do Not Cop
VA703b/VA703m

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Summary of Contents for ViewSonic VA703b

  • Page 1: Service Manual

    Service Manual ViewSonic VA703b / VA703m Model No VS11280 17” Color TFT LCD Display Manufacture Date: May-10-06 - 1 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 2: Revision History

    ENERGY STAR guidelines for energy efficiency. Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or omissions contained herein; nor for incidental or consequential damages resulting from furnishing this material, or the performance or use of this product.

  • Page 3: Table Of Contents

    6. Troubleshooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Disassemble Process 10. Block Diagram 11. Schematic Diagram 12. PCB Layout Diagram - 3 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 4 3. Keep wires away from high voltage, high temperature components and sharp edges. 4. Keep wires in their original position so as to reduce interference. 5. Usage of this product please refer to also user’s manual. - 4 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 5 “Mura.” not touch the surface of the polarizer. Taking out the monitor by grasping the LCD Take out the monitor with cushions panel. That may cause “Mura.” - 5 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 6 “Mura.” Place the monitor on the lap, the panel The panel is placed facedown on the lap. That surface must be upwards. may cause “Mura.” - 6 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 7 Energy Star compliant VESA Power Management DPMS compatible <1 W Input Voltage : 100V~240V Consumption: ON Mode < 35 W (max) Power POWER SAVING < 2W OFF < 1W - 7 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 8: Viewsonic Corporation

    Blue video input No Connection Ground Red video ground Green video ground Blue video ground H/V sync ground No connection (SDA) Horizontal sync (Composite sync) Vertical sync (SCL) SIGNAL LEVEL - 8 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 9 Front Panel Function Controls And Indicators - 9 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 10 • 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.) - 10 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 11 6500K-Adds red to the screen image for warmer white and richer red. 5400K-Adds green to the screen image for a darker color. User Color Individual adjustments for red (R), green (G), and blue (B). - 11 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 12 Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and ® the ViewSonic website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).
  • Page 13 Preset Timing Mode listed in the Specifications of this manual. Exception: This control does not affect changes made with the User Color control, Language Select or Power Lock setting. - 13 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 14 White Balance (Not shown on user’s guide) (keep pushing 5 sec) [1] + [▼] Power Lock [1] + [▲] OSD Lock Remark : All the short cuts function are only available while OSD off - 14 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 15: Circuit Description

    4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION The main board contains panel control logic, brightness control logic, DDC and DC convert DC circuit and so on. PWPC board Backlight and Panel TSUM16AK Keyboard EPROM EPROM - 15 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 16 Start Circuit R903, R904,R905 CN902 Over Control IC Voltage Protect ON/OF OSC and MOSFET DC Convert Output Q203 Circuit Circuit Lamp Over ON/OFF Feedback Voltage Control Circuit Control IC - 16 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 17 2.7 Volt to 3.6 Volt for 25MHz or from 3.0 Volt to 3.6 Volt for 33MHz to perform read, erase and program operations. The devices can be programmed in standard EPROM programmers as well. - 17 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 18 “1”, all write operations to the status register are inhibited. Hold: Pause serial communication with the master device HOLD# INPUT without resetting the serial sequence. Circuit Diagram - 18 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 19 Features of the UTC TDA7496L include linear volume control, Stand-by and mute functions. The function of each pin and the inside circuit diagram are as follows: Block Diagram PIN Function - 19 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 20 Connect this pin to positive of bulk capacitor to provide the startup current for the controller, when Vcc voltage trips the UVLO(on), this HV loop will be off to save the power loss on the startup circuit. Block Diagram - 20 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 21 Capacitor for soft start time and loop compensation Timing resistor and capacitor for operation and striking frequency GNDA Ground for analog signals DRV2 Drive output PGND Ground for power paths - 21 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 22 Block Diagram - 22 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 23: Adjustment Procedure

    5400 color temp. parameter is Wx = 0.335 0.03;Wy = 0.350 0.03; Y = 250 20 cd/m D MEM.CHANNEL10 ( SRGB color): 6500 color temp. parameter is Wx = 0.313 0.03;Wy = 0.329 0.03; Y = 220 20 cd/m - 23 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 24 (6) Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100 (7) Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100 5 - 24 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 25 2).Change to each mode in turn and wait for the monitor finish auto-alignment and save press before change to next mode. 3).Until all of modes are adjusted,exit OSD menu and press POWER OFF to exit factory mode. - 25 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 26 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 800 x 600 @ 56Hz, 35.1kHz - 26 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 27 Figure 7,8 Pixel/Line Screen compliant with the spec. The screen must have White Balance White & Black Pattern the pure white and black Figure 9 pattern, no other color. - 27 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 28 Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2) Horizontal & Vertical Thickness Pattern R. Color Pattern (Figure 4) (Figure 3) G. Color Pattern (Figure 5) B. Color Pattern (Figure 6) - 28 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 29 Make sure it can pass test program. Fine Tune and Sharpness Test Signal: 1280*1024@60Hz Test Pattern: Line Moire Pattern Check and see if the image has noise and focus performs well. Eliminate visual - 29 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 30 - Make sure that audio function (volume 80%) is working without noise and resonance. - Make sure that the sound of right and left speakers are in balance. Check for Secondary Display Modes Test Signal: Analog: 640*350@70Hz; 640*480@60/67/72/75/85Hz; - 30 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 31 - VGA Cable (P/N: 42.59901.003) *1(Pin 4, 11 should be connected to GND) - PC (Personal Computer) - LPT Cable (P/N: 42.59906.001) *1 - Firmware Upgrade Program - One additional monitor for checking the program execution - 31 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 32 P3 to Signal Generator P2 to LPT Cable 3 Firmware Upgrade Procedure Step 1. Let VA503/VA703/VA903 set to be connected with AC cable and VGA cable. Step 2.Execute the MSstar ISP tool. - 32 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 33 Step 4. Click “Connect” button. (On this step, if the connection is successful, the “Entry ISP Mode” Dialog will be showed. If not, the error dialog will be done.) - 33 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 34 Step 6. Click “Read” button. Select the object bincode on your corresponding directory. Step 7. Click “Auto” button. Execute the flashing action by clicking the “Run” button. - 34 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 35 PC by LPT Cable. 3.2.3 Plug Power Adapter to Fixture. 3.2.4 Connect Power Cord to VA503/VA703/VA903 Monitor. 3.2.5 Connect PC to the additional monitor. Power Adapter VGA Cable P1 to LTP Cable - 35 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 36 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program - 36 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 37 Sep2:Inpute the S/N and execute “Enter” - 37 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 38 - 38 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 39 Sep3:Key the “Enter” and write the data - 39 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 40 Sep4:If ddc program OK and show “data compare ok” - 40 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 41 5.7 Packing Procedure - 41 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 42: Troubleshooting Flow Chart

    Troubleshooting Flow Chart - 42 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 43 Recommended Spare Part List VA703m BOM list T780KK5HKUVWABP ViewSonic Universal Item Ref. P/N Description Location Q'ty number# - 43 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
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  • Page 59: Exploded Diagram And Spare Parts List

    8. Exploded Diagram And Spare Parts List - 59 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 60 M1G2640 8 47 VESA RUBBER J12G 808 1 SCREW M1G 330 6 47 STAND A34G0027 KR L BASE A34G0028 KR L FOOT J12G 394800 SCREW Q1G1140 8120 SCREW M1G 330 4120 - 60 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 61 Packing For Shipping - 61 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 62 45G 88609 B PE BAG 45G 88607 J44G7003 1 J44G7003 2 AUDIO CABLE 89G 173 56 31 POWER CORD 89G402A18N LS SIGNAL CABLE 89G 725HAA903 BASE A34G0028 KR L - 62 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 63: Disassemble Process

    Disassemble the 4 fixed screws of the panel, remove the main frame, as showed in the following the picture 15,16,17. Do not damage the cable of the panel. That’s all. The disassemble process of the unit is over. - 63 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 64 9.1.3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 - 64 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 65 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12 - 65 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 66 Picture 13 Picture 14 Picture 15 Picture 16 - 66 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 67 Picture 17 - 67 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 68: Block Diagram

    Block Diagram - 68 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 69: Schematic Diagram

    +12V PC5V VCTRL VCTRL 5.PANEL INTERFACE +3V3 VCC1.8 Adj_BACKLIGHT Adj_BACKLIGHT VCC5V VCC3.3 VLCD VLCD_12V Title VLCD 4.SCALER TSUM16AK VLCD_12V Size Document Number 2.POWER Date: Monday, May 09, 2005 Sheet - 69 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 70 PMBS3904 on_Panel_12V 0.1uF C718 0.1uF C717 R727 PMBS3904 C720 C719 R728 0.1uF 10uF/16V 1/16W Title NC/0.1uF NC/10uF/16V NC/4K7 TSUM16AK Size Document Number POWER Date: Monday, May 09, 2005 Sheet - 70 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 71 C448 C449 C450 C451 C452 C453 C454 Title D425 TSUM16AK 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF RLZ36B Size Document Number INPUT Date: Monday, May 09, 2005 Sheet - 71 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 72 OUT-L- OUT-R- KEY_AUTO KEY_MENU Q404 C431 KEY_RIGHT KEY_LEFT PMBS3904 POWER KEY_C CONN OUT-L+ OUT-R+ OUT-L- OUT-R- Title TSUM16AK CONN Size Document Number SCALER Date: Thursday, May 12, 2005 Sheet - 72 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 73 INNOLUX 15 HannStar 15 3.3V 3.3V CPT 15 3.3V 3.3V LG 15 3.3V 3.3V 3.3V Innolux 17" Title TSUM16AK Size Document Number PANEL INTERFACE Date: Monday, May 09, 2005 Sheet - 73 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 74 AOC (Top Victory) Electronics Co., Ltd. Title R834 2. FOR 17" 4 LAMPS INVERTER D803 N.C R833 3.6K 1/10W BAV70 1/10W Size Document Number PWPC1742HDE1 Date: Wednesday , April 12, 2006 Sheet - 74 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 75 AOC (Top Victory) Electronics Co., Ltd. CN901 RJ901 RJ902 Title PWPC1742HDV3P(715G1823-N) SOCKET HEAT SINK HEAT SINK 1/8W 1/8W Size Document Number Custom   Date: Wednesday , April 12, 2006 Sheet - 75 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 76 R210 R211 C212 C211 C209 C210 C213 100pF 1.0uF 1.0uF 0.1uF C208 100pF 470uF/16V Title Audio Size Document Number <Doc> <Rev Code> Date: Tuesday , March 21, 2006 Sheet - 76 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 77 POWER_KEY 120 OHM A_GND SPKR_L+ SPKR_R+ FB01 SPK-R 120 OHM 100pF CONN 100pF A_GND SPK-L A_GND Title KEY PAD Size Document Number Date: Tuesday , March 21, 2006 Sheet - 77 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...

  • Page 78: Pcb Layout Diagram

    12. PCB Layout Diagram 12.1 MAIN BOARD PCB TOP VIEW - 78 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 79 12.2 MAIN BOARD PCB BUTTON VIEW - 79 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 80 12..3 POWER PCB TOP VIEW - 80 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 81 12.4 POWER PCB BUTTON VIEW - 81 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 82 12.5 KEY BOARD TOP VIEW 12.6 KEY BOARD BUTTON VIEW - 82 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 83 12.7 AUDIO PCB TOP VIEW & BUTTON VIEW - 83 – ViewSonic Corporation Confidential - Do Not Cop VA703b/VA703m...
  • Page 84 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 suggestion to the Director, Quality System & Process (marc.maupin@viewsonic.com) - 84 – ViewSonic Corporation...

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Va703mVs11280

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