ViewSonic VA712B - 17" LCD Monitor Service Manual
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ViewSonic VA712B - 17" LCD Monitor Service Manual

ViewSonic VA712B - 17" LCD Monitor Service Manual

17" color tft lcd display
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Service Manual

ViewSonic VA712-2
VA712b-2
Model No. VS10901
17" Color TFT LCD Display
(VA712-2_ VA712b-2_SM Rev. 1a Apr. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA – (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA712-2 VA712b-2 Model No. VS10901 17” Color TFT LCD Display (VA712-2_ VA712b-2_SM Rev. 1a Apr. 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

    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 VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • 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 refers to also user’s manual. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • 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.” ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • 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 VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 7: Specification

    Storage: -20°C to +60°C Input Signal Analog / Digital Energy Star compliant VESA Power Management DPMS compatible ¡ Ø 1 W Input Voltage : 90V~264ACV¡ A 50~60Hz(auto switch) Power Consumption: 39 Watts(Max.) 36 Watts(Typ.) ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 8 1152 x 870 @ 75Hz, 68.6kHz 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280 x 720 @ 60Hz, 45kHz Primary Preset:¡ G VESA : 1280 x1024@60Hz ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 9 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 VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 10 TMDS positive differential input, channel 0 Logic Ground Reserved 20 Reserved. No connection Reserved 21 Reserved. No connection Logic Ground RXC+ TMDS positive differential input, reference clock RXC- TMDS negative differential input, reference clock ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 11: Front Panel Function Control Description

    3. Front Panel Function Control Description ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 12 • 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 VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 13 2. To adjust selected color, press ▼ and ▲. Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 14 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 15 OSD Background allows the user to turn the OSD background On or Off. Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 16 5 seconds. • OSD Unlock: Press and hold “[1], & ▲” again for 10 seconds. Volume mute on/off Remark : All the short cuts function are only available while OSD off ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 17: Circuit Description

    CCFL Drive. Flat Panel and CCFL backlight RS232 Connector For white balance Main Board Power Board adjustment in factory (Include: adapter, inverter) mode Video signal, DDC Key Board AC-IN 100V-240V HOST Computer ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 18 4.2 POWER BLOCK FUNCTION DESCRIPTION Inverter Block Function ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 19 ASIC. For optimum screen quality, the user has to adjust each function manually. Firmware Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls) Make sure the F/W is the latest version. Test Pattern: EDID program ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 20 Test Signal: Voice signal (optional, depend on model) Test Pattern: liberty - Make sure there is audio output. - Make sure that audio function (volume 80%) is working without noise and ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 21 After final QC step, we have to erase all saved changes again and restore the factory defaults. You should do “All Mode Reset” again. Power Off Monitor Turn off the monitor by pressing “Power” button. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 22 ADC vertical sync input 5V tolerance Power from PIN 13 AHSO ADC horizontal sync input Adjustable Schmidt trigger 5V tolerance Power from PIN 13 AIC1084-33PM (U701): DC power convert, used to 5v convert 3.3v. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 23 8051 CPU core, 768-byte SRAM, 4 channels of 6-bit ADC, 3 external counters/timers, 6 channels of PWM DAC, VESA DDC interface, and a 64K-byte internal program Flash-ROM memory. Circuit Diagram ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 24 General purpose Output/Slave llC1 SCL2 open drain High Active RESET HSCL1/P3.0/RXD Slave IIC clock/General purpose I/O/Rxd (open drain) HSDA1/P3.1/RXD Slave IIC clock/General purpose I/O/Txd (open drain) P3.2/INT0 General purpose I/O/External interrupt 0(Standard 8051) ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 25 TDA7496L (U201): The UTC TDA7496L is a stereo 2W+2W class AB power amplifier, specially designed for high quality sound, TV and Monitor applications. Features of the UTC TDA7496L include linear volume control, Stand-by and mute functions. Pin Function ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 26 This pin is to program the switching frequency. By connecting a resistor to ground to set the switching frequency. Unconnected pin Supply voltage pin Gate drive output to drive the external MOSFET ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 27 COMP Error Amplifier Output Vref Reference Voltage Soft Start Dimming Mode Selection Main Ct Burst Dimming Frequency Supply Voltage Open Lamp Protection Vcc1 Output Drive Source Voltage Shutdown Protection Output Drive ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 28 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 29: Adjustment Procedure

    Y > 210 cd/m D¡ B MEM.CHANNEL 12 ( 5000 color): 5000 color temp. parameter is Wx = 0.346¡ Ó 0 .02;Wy = 0.359 ¡ Ó 0 .02; Y > 210 cd/m ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 30 (4)¡ B Adjust the RED of color3 on factory window until Chroma 7120 indicator reached the value R=100 (5)¡ B Adjust the GREEN of color3 on factory window until Chroma 7120 indicator reached the value G=100 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 31 (2)¡ B Switch the MEM .channel to Channel 10( with up or down arrow on chroma 7120 ) (3)¡ B The LCD-indicator on chroma 7120 will show x = 0.313 ¡ Ó 0.02, y = 0.329 ¡ Ó 0.02, Y>220 cd/m ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 32 30 minutes with the following conditions: (a)In room temperature, (b) With full-white screen, RGB, and Black (c) With cycled display modes, 640*480 (H=43.27kHz, V=85Hz) 800*600 (H=53.7kHz, V=85Hz) 1024*768 (H=68.67kHz, V=85Hz) 1280*1024 (H=79.97kHz, V=75Hz) ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 33 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 VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 34 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 VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 35 Full White Pattern (Figure 7) Dark Screen Pattern (Figure 8) Black-White Pattern (Figure 9) ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 36 2.2 Connect P2 of Fixture with VA712-2/VA712b-2 Monitor by VGA Cable. 2.3 Connect Power Cord to VA712-2/VA712b-2 Monitor. 2.4 Connect P3 to the Signal Generator (eg.Chroma2326) for verifying it after the operation being completed. 2.5 Connect PC to the additional monitor. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 37 3 Firmware Upgrade Procedure Step 1. Let VA712-2/VA712b-2 set to be connected with AC cable and VGA cable. Step 2.Execute the MSstar ISP tool. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 38 Step 3. Click “Create Security File” button. Open a new window to key in security code. Step 4.Set “Command NO” to 4,and key in security code :“94,94,ac,ca,53” to shown as following, then press “OK” button to close window. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 39 Step 5. Click dropdown listbox for MTV type, select the “MTV512M64” viewed on your set. Step 6. Click “Load MCU File” button. Select the object bincode on your corresponding directory. Step 7. Click “ ” button to finish the selection of bincode. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 40 “RUN” button. Step 9. If the flashing F/W has been completed, the message of “Check MCU CRC OK” on the right TextBox means the Host verify ok for the progress of program. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 41 3.2.4 Plug Power Adapter to Fixture. 3.2.5 Connect Power Cord to VA712-2/VA712b-2 Monitor. 3.2.6 Connect PC to the additional monitor. Power Adapter P3 DVI-DVI Cable VGA Cable P1 to LTP Cable ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 42 3.3 DDC Key In Procedure Sep1.Select and execute DDC Key In program ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 43 Sep2:Inpute the S/N and execute “Enter” ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 44 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 45 Sep3:Key the “Enter” and write the data ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 46 Sep4:If ddc program OK and show “data compare ok” ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 47: Disassemble Process

    Disassemble the 2 fixed screws of the panel, remove the main frame, as showed in the following the picture 18,19,20. Do not damage the cable of the panel. That’s all. The disassemble process of the unit is over. ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 48 1.1.3 Show pictures¡G Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 49 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 50 Picture 13 Picture 14 Picture 15 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 51 Picture 16 Picture 17 Picture 18 Picture 19 Picture 20 ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 52: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 53: 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 54: 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 55 BOM LIST (VA712-2) ViewSonic Model Number: VS10901-1W Rev: 1a Serial No. Prefix: PX5 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00004963 AUPC780B3P AUDIO BOARD B-00005609 CBPC780KCWV4P CONVERSION BOARD B-00005610 KEPC780KE1P KEY BOARD B-00005611 PWPC1742CPV2P POWER BOARD 11G6054 1...
  • Page 56 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty HW-00005628 M1G1730 6128 SCREW HW-00005629 M1G1740 12120 SCREW HW-00005630 Q1G 130 6120 SCREW Q1G 330 8128 SCREW Q1G 330 8128 SCREW Q1G 330 10 47 SCREW HW-00005633 Q1G1030 8128 SCREW...
  • Page 57 BOM LIST (VA712b-2) ViewSonic Model Number: VS10901-3W Rev: 1a Serial No. Prefix: PX7 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty B-00004963 AUPC780B3P AUDIO BOARD B-00005653 CBPC780KCWV3P CONVERSION BOARD B-00005610 KEPC780KE1P KEY BOARD B-00005611 PWPC1742CPV2P POWER BOARD 11G6054 1...
  • Page 58 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty HW-00005626 M1G 330 4128 SCREW HW-00005627 M1G1140 6128 SCREW HW-00005628 M1G1730 6128 SCREW HW-00005628 M1G1730 6128 SCREW HW-00005628 M1G1730 6128 SCREW HW-00005629 M1G1740 12120 SCREW HW-00005630 Q1G 130 6120 SCREW...

  • Page 59: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 60 EXPLODED PARTS LIST (VA712-2) ViewSonic Model Number: VS10901-1W Rev: 1a Serial No. Prefix: PX5 Item ViewSonic P/N Ref. P/N Description Q'ty 52G6020 1 PROTECT FILM 23G3178709 4A VSC17-LCD FRONT LOGO 33G4942 X2 B FUNCTION BUTTON 33G4943 1 POWER LENS C-00005612...
  • Page 61 EXPLODED PARTS LIST (VA712b-2) ViewSonic Model Number: VS10901-3W Rev: 1A Serial No. Prefix: PX7 Item ViewSonic P/N Ref. P/N Description Q'ty 52G6020 1 PROTECT FILM 23G3178709 4A VSC17-LCD FRONT LOGO 33G4942 X2 B FUNCTION BUTTON 33G4943 1 POWER LENS C-00005654...
  • Page 62 Packing for Shipping PACKING PART LIST ( VA712-2 ) ViewSonic Model Number: VS10901-1W Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty P-00005646 J44G3783709 2C CARTON 50G 600 2/3 HANDLE1/2 P-00005642 45G 76 28 V3 PE BAG DC-00005618 70G1701709 8A...

  • Page 63: Block Diagram

    9. Block Diagram ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 64: Schematic Diagrams

    R718 U703 ’\ 1/16W R721 ’\ 1/16W AO3401L R722 4.7K ’\ 1/16W Q704 C717 PANEL_PW C720 R724 C718 PMBS3904 0.1uF ViewSonic Corporation 10uF/16V ’\ 1/16W 0.1uF Model POWER Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 65: Viewsonic Corporation

    C452 R4017 0.1uF ’\ 1/16W EDID_WP EDID_WP R4027 ’\ 1/16W R4028 ’\ 1/16W DDC_SCL DDC2_SCL R4029 ’\ 1/16W DDC_SDA DDC2_SDA R4026 ’\ 1/16W ViewSonic Corporation M24C02WMN6 M24C02WMN6 Model Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 66 DDCSDA1 DDC_SDA BJT_B R430 1.8DVCC +3.3V R431 ’\ 1/16W 3.3V_Vd Q401 R432 ’\ 1/16W VOLUME 1.8DVCC PMBS3906 Q402 ViewSonic Corporation R433 ’\ 1/16W BRIGHTNESS PMBS3906 Q403 R434 ’\ 1/16W NC/2SB1188 Model SCALER Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 67 D415 UDZS5.6B D416 UDZS5.6B VGA_G DGND DDC_VDD DGND DDC_SCL C435 DDC_SCL D417 UDZS5.6B D418 UDZS5.6B DGND CONNECT DGND DDC_SDA DDC_SDA ViewSonic Corporation D414 BAV99 D419 UDZS5.6B D420 UDZS5.6B DGND DGND DDC2_SCL VGA_B C436 D421 UDZS5.6B D422 UDZS5.6B Model INPUT DGND DGND...
  • Page 68 MLL4148 R224 R225 R228 10KO 1/10W 10KO 1/10W 330KO 1/8W R226 R227 is power GND D216 10KO 1/10W 10KO 1/10W MLL4148 D217 ViewSonic Corporation MLL4148 is signal GND Model INVERTER C221 C222 C223 C224 0.0022uF/50V 0.0022uF/50V 0.0022uF/50V 0.0022uF/50V Title Date...
  • Page 69 1KO 1/10W KIA431A-AT/P IC921 R928 KIA431A-AT/P 3.9KO 1/10W C908 R919 0.1uF/25V 100KO 1/10W CONN C931 0.1uF/50V SW901 R929 2.4KO 1/10W 1% CN901 ViewSonic Corporation SOCKET Model A-D POWER Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 70 VOLUME C207 PHONEJACK 200’\ STBY VAROUT_R R207 R208 MUTE VAROUT_L R210 R211 C211 C212 C209 C210 C213 100pF 1.0uF 1.0uF 0.1uF C208 100pF 470uF/16V ViewSonic Corporation Model AUDIO Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 71 KEY DOWN LCD ON/OFF KEY UP MUTE MUTE SPKR_L+ SPKR_R+ SPKR_R+ SPKR_L+ SW001 SW002 SW003 SW004 SW005 SW006 CONN CN003 CONN CN002 ViewSonic Corporation CONN Model KEY PAD Title Date Rev: ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 72: Pcb Layout Diagrams

    11. PCB Layout Diagrams 11.1 MAIN BOARD PCB TOP VIEW ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 73 11.2 MAIN BOARD PCB BUTTON VIEW 11.3 KEYBOARD TOP VIEW 11.4 KEYBOARD BUTTON VIEW ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...

  • Page 74: Power Pcb Top View

    11.5 POWER PCB TOP VIEW ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 75 11.6 POWER PCB BUTTON VIEW ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 76 11.7 AUDIO PCB TOP VIEW & BUTTON VIEW ViewSonic Corporation VA712-2_ VA712b-2 Confidential - Do Not Copy...
  • Page 77 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 VA712-2_ VA712b-2...

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