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ViewSonic VA703b-1 Service Manual

17” color tft lcd display
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Service Manual

ViewSonic VA703b-1
VA703m-1
Model No. VS11280
17" Color TFT LCD Display
(VA703b-1_VA703m-1_SM Rev. 1b Oct. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA703b-1 VA703m-1 Model No. VS11280 17” Color TFT LCD Display (VA703b-1_VA703m-1_SM Rev. 1b Oct. 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 VA703b-1_VA703m-1...

  • Page 4: Precautions And Safety Notices

    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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 5 Do and that may cause “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.” ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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.” ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 7: Specification

    Storage: -20°C to +60°C 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 8 Green video input 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 9: Front Panel Function Control Description

    3. Front Panel Function Control Description ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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.) ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 11: Main Menu Controls

    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 VA703b-1_VA703m-1...
  • Page 12 Preset Timing Mode, colors return to the 6500K factory preset. 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 ®...
  • 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 16 EMI filter and Filter 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 18 Write Protect: When the WP# pin brought to low and WPEN bit is INPUT “1”, all write operations to the status register are inhibited. Hold: Pause serial communication with the master device without HOLD# INPUT resetting the serial sequence. Circuit Diagram ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 19 TV and Monitor applications. 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 21 SSECMP 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 22 Block Diagram ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 24: B Adjust 6500 Color-Temperature

    (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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 26 640 x 480 @ 67Hz, 35.0kHz 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 27 White Screen & Dark pixels should 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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) ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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; ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 33 “Communication Setting” flame, and then the Speed: 47 on “E2PROM Device Setting” flame 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.) ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 34 Step 5. Click “Device” button. Select the “PMC25LV010” or “SST25VF010” viewed on your set. 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • 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 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 36 3.3 DDC Key In Procedure Sep1.Select and execute DDc Key In program ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 37 Sep2:Inpute the S/N and execute “Enter” ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 38 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 39 Sep3:Key the “Enter” and write the data ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 40 Sep4:If ddc program OK and show “data compare ok” ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 41: 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. ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 42 1.3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 43 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 44 Picture 13 Picture 14 Picture 15 Picture 16 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 45 Picture 17 ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 46 Packing Procedure ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 47: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 48: 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 49: Viewsonic Corporation

    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 50 BOM LIST (VA703b-1) ViewSonic Model Number: VS11280 Rev: 1b Serial No. Prefix: Q85 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00008144 CBPC780KC5VWP CONVERSION BOARD B-00005797 KEPC560KE1P KEPC BOARD B-00008145 PWPC742CV2P POWER BOARD 23G3178709 4A VSC17-LCD FRONT LOGO...
  • Page 51 BOM LIST (VA703m-1) ViewSonic Model Number: VS11280 Rev: 1b Serial No. Prefix: Q86 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00006489 AUPC780B4P AUDIO BOARD CBPC780KC5VWAP CONVERSION BOARD B-00005824 KEPC560KD9P KEPC BOARD B-00008145 PWPC742CV2P POWER BOARD 23G3178709 4A...
  • Page 52 8. Exploded Diagram and Exploded Parts Lis t (VA703b-1) EXPLODED PARTS LIST (VA703b-1) ViewSonic Model Number: VS11359 Rev: 1a Serial No. Prefix: Q85 Item ViewSonic P/N Ref. P/N Description Q'ty C-00006636 A34G0026B4Z L BEZEL PL-00006485 33G5019 KD C FUNC.BUTTON B-00005797...

  • Page 53: Exploded Diagram And Exploded Parts List

    37G5611 HINGE Q52G602511997 INSULATION SPACER J85G74013 MAINSHIELD J15G00131 VESAPLATE C-00006656 A34G0025KR1L REARCOVER M1G330647 SCREW M1G2640847 SCREW J12G8081 VESARUBBER M1G330647 SCREW PL-00006512 A34G0027KRL STAND C-00006513 A34G0028KRL BASE J12G394800 FOOT Q1G11408120 SCREW M1G3304120 SCREW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 54 Packing diagram (VA703b-1) PACKING PART LIST (VA703b-1 ) ViewSonic Model Number: VS11359 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty P-00006649 J44G7003709 2A CARTON 50G 600 2/3 HANDLE1/2 P-00005642 45G 76 28 V3 PE BAG DC-00006640 J70G170170913A CD MANUAL...
  • Page 55 Packing diagram (VA703m-1) PACKING PARTS LIST (VA703m-1) ViewSonic Model Number: VS11359 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty J44G7003709 2A CARTON 50G 600 2/3 HANDLE1/2 45G 76 28 V3 PE BAG J70G170170913A CD MANUAL DC-00006496 41G7801709 8A 45G 88606...

  • Page 56: Block Diagram

    9. Block Diagram ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 57: Schematic Diagrams

    VLCD_12V on_BACKLIGHT on_BACKLIGHT VCC3.3 on_Panel on_Panel on_PANEL_12V on_PANEL_12V +12V PC5V VCTRL VCTRL 5.PANEL INTERFACE +3V3 VCC1.8 Adj_BACKLIGHT Adj_BACKLIGHT VCC5V VCC3.3 VLCD VLCD_12V VLCD 4.SCALER ViewSonic Corporation VLCD_12V 2.POWER Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 58 R726 NC/4K7 C716 on_Panel 4.7K 1/16W C715 Q707 on_Panel_12V PMBS3904 0.1uF C718 0.1uF C717 R727 PMBS3904 C720 C719 R728 0.1uF 10uF/16V 1/16W NC/0.1uF NC/10uF/16V NC/4K7 ViewSonic Corporation Model Title POWER Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 59 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 ESD_5V C447 C448 C449 C450 C451 C452 C453 C454 ViewSonic Corporation D425 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF RLZ36B Model INPUT Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy...
  • Page 60 KEY_B KEY_A R433 OUT-L+ OUT-R+ LED_G LED_A Volume Q404 C431 OUT-L- OUT-R- KEY_AUTO KEY_MENU KEY_RIGHT KEY_LEFT PMBS3904 POWER KEY_C CONN OUT-L+ OUT-R+ ViewSonic Corporation OUT-L- OUT-R- CONN Model SCALER Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 61 QDI 17 3.3V CPT 17 3.3V 3.3V INNOLUX 15 HannStar 15 3.3V 3.3V CPT 15 3.3V 3.3V LG 15 3.3V 3.3V 3.3V Innolux 17" ViewSonic Corporation Model PANEL INTERFACE Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 62 100K 1/10W 33G8021-2D-U R832 1/8W 3M / 1/2W 1000P/ R830 1/10W Q806 AM9945 R835 1/10W D804 BAV99 R834 D803 N.C R833 3.6K 1/10W ViewSonic Corporation BAV70 1/10W Model INVERTER Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 63 GND2 2.5A/250V R928 1/4W R930 IC921 KIA431 Q910 100 1/10W R929 PMBS3906(NC) HS3 D920 HS4 Q900 2.4K 1/10W 1% ViewSonic Corporation CN901 RJ901 RJ902 SOCKET HEAT SINK HEAT SINK 1/8W 1/8W Model A-D POWER Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy...
  • Page 64 1/16W 470uF/16V VOLUME C207 PHONEJACK STBY VAROUT_R R207 R208 MUTE VAROUT_L R210 R211 C211 C212 C209 C210 C213 100pF 100pF 1.0uF 1.0uF 0.1uF C208 470uF/16V ViewSonic Corporation Model Audio Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 65 KEY _AUTO KEY _MENU 1/16W KEY _RIGHT KEY _LEFT POWER_KEY 120 OHM A_GND SPKR_L+ SPKR_R+ FB01 SPK-R 120 OHM 100pF CONN 100pF A_GND SPK-L A_GND ViewSonic Corporation Model Key Pad Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...

  • Page 66: Pcb Layout Diagrams

    11. PCB Layout Diagrams 11.1 MAIN BOARD PCB TOP VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 67 11.2 MAIN BOARD PCB BUTTON VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 68 11..3 POWER PCB TOP VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 69 11.4 POWER PCB BUTTON VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 70 11.5 KEY BOARD TOP VIEW 11.6 KEY BOARD BUTTON VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 71 11.7 AUDIO PCB TOP VIEW & BUTTON VIEW ViewSonic Corporation Confidential - Do Not Copy VA703b-1_VA703m-1...
  • Page 72 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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