ViewSonic VX912-4 Service Manual
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ViewSonic VX912-4 Service Manual

ViewSonic VX912-4 Service Manual

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Service Manual

ViewSonic VX912-4
Model No. VS10162
19" Color TFT LCD Display
(VX912-4_SM Rev. 1a Jun. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VX912-4

  • Page 1: Service Manual

    Service Manual ViewSonic VX912-4 Model No. VS10162 19” Color TFT LCD Display (VX912-4_SM Rev. 1a Jun. 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

    1.Precautions and Safety Notices 2.Specification 3.Front Panel Function Control Description 4.Circuit Description 5.Adjustment Procedure 6.Troubleshooting Flow Chart 7.Recommended Spare Parts List 8.Exploded Diagram and Exploded Parts List 9.Block Diagram 10.Schematic Diagrams 11.PCB Layout Diagrams ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    1.0 milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the chance of a shock hazard . AC VOLTMETER 0.15u 1500 To Metal Parts Earth Ground ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 5 “ MURA “ Do not touch the surface of the polarizer . Take out the monitor with cushion Take out the monitor by grasping the LCD panel. That may cause “ MURA“. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 6 Correct Methods : Incorrect Methods : Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects . That could scratch the surface of panel ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 7: Specification

    1280 x 720, 1280 x 960, 1280 x 1024 Resolution Compatibility * The image vertical size might not be full screen. But the image vertical position should be at the center. Exclusions Not compatible with interlaced video ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 8 Speakers stay on where the rest of the monitor is in power –saving. Audio DPMS Note: There us no guarantee <1w power consumption in active off mode when the Audio cable is connected. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 9 1024 x 768 @ 85Hz, 68.67kHz 1152 x 864 @ 75Hz, 67.5kHz 1152 x 870 @ 75Hz, 68.7kHz 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280x 720 @ 60Hz, 45kHz (HDTV) ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 10 Response Time 5 ms (Tr= 1,5 ms, Tf = 3.5 ms) (typ) 10%-90% @ Ta=25°C 10 ms (Tr= 3 ms, Tf = 7 ms) (max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 11 Operating Relative Humidity : 20% to 90% RH Non-Condensing Storage Relative Humidity : 5% to 90% RH Non-Condensing Operating Altitude : 0 to +3,000 meters Storage Altitude : 0 to +12,000 meters ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 12: Front Panel Function Control Description

    3. Front Panel Function Control Description ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 13: Main Menu Controls

    ViewSonic VX912-4 Main Menu Controls Adjust the menu items shown below by using the up and down buttons. Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image.

  • Page 14: Circuit Description

    SIGNAL Red Video DB15HD Green Video Blue Video None Ground(DDC return) Red GND Green GND Blue GND + 5V (for DDC) Sync GND None DDC Data Horizontal Sync Vertical Sync DDC Clock ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 15 <1Watt 3.3. Acceptable timing If your timing is within following specification, this LCD display can automatically function with a certain position. Horizontal: Sync frequency : 30~81 kHz Vertical: Sync frequency : 56~85Hz(1280x1024,75Hz) ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 16 Input impedance Video input : 75 ohms Sync input : > 1 k ohms 4. SIGNAL CABLE : Signal cable with Mini D-Sub 15P connectors at both ends. Length : 1.8 meter. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 17: ______________________________________________________________________

    EDID data Analog EDID ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VX912-3 ______________________________________________________________________ ______________________________________________________________________ 128 BYTES OF EDID CODE: ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63 10 | 1C D7 01 01 01 01 01 0F 01 03...

  • Page 18: ______________________________________________________________________

    1024 X 768 @85Hz 800 X 600 @85Hz 640 X 480 @85Hz Not Used Not Used Not Used ______________________________________________________________________ (54-71) Detailed Timing / Descriptor Block 1: 1280x1024 Pixel Clock: 108.00 MHz ______________________________________________________________________ ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 19: ______________________________________________________________________

    Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VX912-3 (126) No Extension EDID Block(s) (127) CheckSum OK ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 20: ______________________________________________________________________

    Digital EDID ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VX912 ______________________________________________________________________ 128 BYTES OF EDID CODE: 0 | 00 FF FF FF FF FF FF 00 5A 63 10 | 1C D7 01 01 01 01 01 0F 01 03...

  • Page 21: ______________________________________________________________________

    1024 X 768 @85Hz 800 X 600 @85Hz 640 X 480 @85Hz Not Used Not Used Not Used ______________________________________________________________________ (54-71) Detailed Timing / Descriptor Block 1: 1280x1024 Pixel Clock: 108.00 MHz ______________________________________________________________________ ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 22: ______________________________________________________________________

    Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VX912-3 (126) No Extension EDID Block(s) (127) CheckSum OK ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 23: Theory Of Operation

    MTV312 Micro controller: The MTV312 micro controller(MCU) serves as the system micro controller. It’s programs the MST8131A and manages other devices in the system such as the keypad, the backlight, LED, audio and non-volatile RAM. using general purpose input/output (GPIO) pins. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 24 Oscillator with an active current sense circuit. Desired output voltage are determined by the equation, Volt = 1.25 ( 1 + R85 / R86), In this case, the output voltage are 5.0 Volts for panel power. ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 25 90~260 Vac , 47 ~ 63Hz Input Current <1.5A Inrush Current <100A@120Vac Standby Input Voltage 12Vdc Output Voltage Regulation +/-5% Output Ripple & Noise 120mVp-p Rate Output Current <3.5A Turn-on delay <3secs ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 26: Adjustment Procedure

    1024 x 768 @ 85Hz, 68.67kHz 1152 x 864 @ 75Hz, 67.5kHz 1152 x 870 @ 75Hz, 68.7kHz 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280x 720 @ 60Hz, 45kHz (HDTV) ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 27 Full black Full black Pattern 7 5-cycle pattern 5-cycle pattern Check the BU Pattern 8 1-dot pattern 1-dot pattern Check the flicker Pattern 9 Pattern 1 Pattern2 Pattern 3 Pattern4 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 28 Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 29: Firmware Update Procedure

    When you received a received monitor , please check whether the firmware version. If not , please following procedure to upgrade to the latest version . 1. Equipment needed : VX912-4 PC ( Personal computer ) LPT cable Fixture (for LM5ISP) Firmware upgrade program 2.
  • Page 30 In order to ensure can execute ISP program, please set BIOS in PC or Notebook as Fig 0.0 Fig 0.0 0.1 Double-click the “ PORT95NT.exe” in Windows & install the program. , see Fig 0.1 Fig 0.1 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 31 0.2 Keep on press “ Next “ 4 times to go through the installation processes, see Fig. 0.2 Fig. 0.2 0.3 Choose “ Typical “ then press “ Next “ , see Fig. 0.3 Fig. 0.3 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 32 0.4 Keep on press “ Next “ 4 times to go through the installation processes, see Fig. 0.4 Fig. 0.4 0.5 Install completed , restart the PC or notebook. See Fig 0.5 Fig. 0.5 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 33 After extracting the ZIP file , the total files list as Fig 1.0 , and double click the file of setup.exe to install. Fig 1.0 Press “ Next “ button to continue., see Fig 1.1 Fig 1.1 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 34 Keep default setting or press “ Change “ button for selecting the path that you want , and then press “ Next “ button to continue , see Fig 1.2 Fig 1.2 Press “ Install “ button to continue , see Fig 1.3 Fig. 1.3 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 35 Installation has finished , press “ Finish “ button , see Fig 1.4 Fig. 1.4 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 36 2.1 After installation , we could find the shortcut in the setting path or the program bar ( default setting ) , see Fig 2.1 Fig. 2.1 2.2 Security file is a key to use ISP function , press “ OK “ button , see Fig 2.2 Fig. 2.2 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 37 2.4 Press “ Create Security File “ button to key in Security code . Adjusting bar to decrease speed of IIC bus , See Fig. 2.4 . Speed of IIC bus Fig. 2.4 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 38 7C , 4C , 77. The command No. and command must be set by user while coding. About the detailed of setting , please refer to section 6 boot code of ISP . Fig. 2.5 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 39 3.2 If user change the MTV type , it must load file again , or the buffer of load file will be cleared . 3.3 CRC ( cyclic redundancy check ) : the host can check CRC register’s result instead of reading every byte in flash . ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 40 The message of Check MCU CRC OK means that the host verify OK for the progress of program , see Fig.3.2 Fig. 3.2 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 41: Packing Procedure

    1.3 Put the cushion on the monitor (Figure.3) 1.4 Put the monitor into carton & put all the accessories into the carton .Then close the carton . (Figure.4) (Figure 3) (Figure 4) Power cord ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 42 2.3 Remove the 4pcs of black hinge screw & separate the stand & head part (Figure 7) 2.4 Face-down & put the monitor on soft surface of desktop (Figure 8) Figure 7 Figure 8 Screws Screws ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 43 2.6 Remove the screws which for fixed the B/B & pull the cable out from the connector on M/B (Figure 10) Figure 9 Figure 10 2.7 Remove the B/B (Figure 11) 2.8 Remove the screws on PCB shield & remove it . (Figure 12) Figure 11 Figure 12 Screws ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 44 2.13 Remove the 4 hexagon screws beside the DVI & D-sub connector . (Figure 17) 2.14 Remove the screws which fixed the power board & Mainboard (Figure 18) Figure 17 Figure 18 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 45: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart No Power ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 46 No Characters , Missing Color ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 47 Always show NO SIGNEL ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 48: Recommended Spare Parts List

    Remark 1: 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 M-SCW-0824-0813 MF30060BBJ6 SCREW F3.0*6-B(NI)GP FCL9V004019 STAND EVA L9VDQ-4(FCL9V004,REV3A) GP M-MS-0808-9812 EBL9V001019 STAND COVER F L9V(EBL9V001,REV3A)GP 2AL9V0PTU08 L9VD-H(VX912-4) PANEL KIT ASSY(HSD) GP E-00005370 AA90ME130F5 LCD(TFT)19" HSD190ME13-D10 5MS GP AZL9VDBU006 L9VD-H(VX912-4) SW BIOS IMAGE 2523(HSD) HW-00001807 FBL9V009010 LCD BKT L-R L9VD-1(FBL9V009,REV3B)GP M-SCW-0824-6800 MM30060IBJ8 SCREW M3.0*6.0-I(NI) GP...

  • Page 50: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 51 EXPLODED PARTS LIST (VX912-4) ViewSonic Model Number: VS10162 Rev: 1a Serial No. Prefix: Q8D Item ViewSonic P/N Ref. P/N Description Q'ty EAL9V009019 BEZEL L9V EAL9V006010 MIDDLE BEZEL L9V EBL9V004018 CONTROL BUTTON M-MS-0808-9243 FEL7V003019 LOGO FRONT-VSC-38CM L7VC(FEL7V003,REV3A) M-MS-0808-9401 EBL7V028019 LENS L7VD(EBL7V028,REV3A)
  • Page 52 PACKING PART LIST (VX912-4) ViewSonic Model Number: VS10162 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 1L9VZHXVS40 VX912-4 unit P-FM-0602-0896 HBL9V001019 END CAP(L) P-FM-0602-0897 HBL9V002015 END CAP(R) DC-00005433 HGL9V023017 CD+QSG(VX912-4) A-PC-0106-0227 DM333181801 Power cord 3P 1.8M P-00001432 HFL9V005018 CARTON VX912...

  • Page 53: Block Diagram

    9. Block Diagram Backlight ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 54: Schematic Diagrams

    LCDVCC LVDS) POWER +3.3V EEPROM +3.3V +3.3V 24LC16 MICRO-CONTROLLER MTV312 POWER INVERTER AIC1739 AC 90-264V +12V +5.0V +2.5V AND AUDIO BOARD 1563 AIC1739 +3.3V ViewSonic Corporation Model BLOCK DIAGRAM Title Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 55 10K/6NC 100/6NC Hot_plug R159 TX0- RX0- R160 TX0+ RX0+ RX5- RX5+ R161 TXC+ RXC+ R162 TXC- RXC- ViewSonic Corporation 0.1U/6/NC Z5.6/NC 1U/6NC Model Z5.6/NC Z5.6/NC Z5.6/NC Z5.6/NC 10K/6NC VGA AND TMDS INPUT Title DVI-D/NC Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 56 TCON8 22/6 BXDIO RTD_SCLK RTD_SDO/SDI TEST POINT SDIO1 TCON9 22/6 YCLK SDIO2 TCON10 22/6 YDIO SDIO3 TCON11 22/6 RTD_SCSB 100/6 RESET ViewSonic Corporation DDC_SDA DDC_SCL Model MCU/ BOTTON CONTROL Title Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 57 P6.5 R124 100/6 P6.6 P3.1/TXD DDC_SDA STBY PWR_SEL R125 100/6 DDC_SCL P6.7 P3.0/RXD MTV312M64 R109 4.7K/6 5DVCC VCC12 R108 4.7K/6 HEADER 4 6.8K/6 ViewSonic Corporation 2K/6 Model SCALAR RTD2523 Title Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 58 PANEL_3VCC PANEL_5_12VCC YCLK NC/FEB_1206 YDIO If panel is 3.3V LVDS IF, L30 must add the part 2004/4/14 PANEL_3VCC FEB_0805/NV FEB_0805/NC FEB_0805/NC FEB_0805/NC PANEL_5_12VCC ViewSonic Corporation RSDS_CON50/NC Model PANEL INTERFACE Title Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 59 SPKOUTR MUTE OUTR AGND 330U/16V/NC AGND MUTE MUTE TDA7496L/NC DTC144EUA/NC AGND L23 BEAD/1206/NC VCC12 AGND AGND AGND R140 10K/6/NC R141 10K/6/NC STBY STBY DTC143EUA/NC ViewSonic Corporation AGND Model Audio Title Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 60 10K/6/NC NC/CX201209805/8 VCPU 3DVCC MMBT3906 CX201209805/8 1K/6 DSUB_5V 1N4148 1N4148 4.7K/6 C100 C101 0.1u/6 NC/6 R143 1U/8 4.7K/6 SN7002E VBRI ViewSonic Corporation 3DVCC MMBT3906 R144 4.7K/6 Model POWER Title DGND Date Rev: ViewSonic Corporation VX912-4 Confidential - Do Not Copy...

  • Page 61: Pcb Layout Diagrams

    11. PCB Layout Diagrams ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
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  • Page 70 ViewSonic Corporation VX912-4 Confidential - Do Not Copy...
  • Page 71 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 VX912-4 Confidential - Do Not Copy...

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