ViewSonic VS11444 Service Manual
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ViewSonic VS11444 Service Manual

ViewSonic VS11444 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VX1945wm-3
Model No. VS11444
19" Color TFT LCD Display
(VX1945wm-3_SM Rev. 1a Nov. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VX1945wm-3 Model No. VS11444 19” Color TFT LCD Display (VX1945wm-3_SM Rev. 1a Nov. 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 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    Keep wires away from high voltage, high temperature components and sharp edges. Keep wires in their original position so as to reduce interference. Adjustment of this product please refers to the user’ manual. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 5 5.2 Handling and Placing Methods VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 6 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 7: Specification

    [ 1 ] [ 2 ] [ ][▼] [▲] Physical (W x H x D) 450 x 434 x 209mm Dimension Package (W x H x D) 545*515*162mm Weight Physical (Net Weight) 5.2 Kg / 11.5 lbs VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 8 Memory Stick Pro (MS Pro) Upper Slot SMC/XD and SD/MMC Lower Slot CF Type I/II and MS/MS Dual/MS Pro Audio / Speaker Subwoofer 3.0W (typ) ; 5.0W (Max) Nominal size Φ46mm >85dB VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 9 USB A-B Cable ; 2-in-1 Cable ; Power adaptor ; iPod adapter set Accessories (default x 1; 4 in set) Viewdock/Quick start guide/CD(for card reader windows 98 Package content driver)/2-in-1 Aduio cable/USB cable/Power adapter/iPod adapter set VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 10: General Specification

    Input Voltage Range 90 to 264 VAC (100~240VAC ±10%) Input Frequency Range 47 to 63 Hertz Short Circuit Protection Output can be shorted without damage Over Current Protection 5.0 A typical at 14.0 VDC VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 11 Mode Power Consumption 35 W (Typ) Green 42 W (max) Stand By Amber < 2 W Active Off < 1 W Recovery Time On Mode = N/A, Active Off < 3 sec VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 12: Timing Table

    800 x 600 75 Hz, 46.9 KHz 800 x 600 85 Hz, 53.7 KHz 832 x 624 75 Hz, 49.7 KHz 1024 x 768 50 Hz, 39.6 KHz For Analog sync, Switch 1024x768@50Hz and VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 13 *2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message without blanking. *3. The image quality of 85Hz mode might be worse than 75Hz. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 14 Minimum: 140º @ CR>5 Typical: Minimum: TBD Response Time Typical = 5ms (Tr = ms,Tf = 10%-90% @ Ta=25°C Maxmum = 15ms (Tr = ms,Tf = Panel Defects Please see Panel Quality Specifications. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 15: Function Descriptions

    Resolution Notice function should be disabled when push button [2] under Resolution Notice 0-Touch™ Function Actions 1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 16 Speakers stay Off when the rest of the monitor is in power saving Audio DPMS Note: There is no guarantee <2 W at power consumption in Active Off mode, when the Audio Cable is connected VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 17: Front Panel Function Control Description

    Adjust. Scrolls through menu options and adjusts the displayed control. Displays the Main Also a shortcut to display Menu or exits the the Contrast adjustment control screen and control screen. saves adjustments. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 18 • 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.) VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 19: Main Menu Controls

    Color Adjust provides several color adjustment modes, including preset color temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin). VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 20 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 21 Sharpness adjusts the clarity and focus of the screen image. Setup Menu displays the menu shown below: Language Select allows the user to choose the language used in the menus and control screens. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 22 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. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 23: System Requirements

    Hardware requirements • Pentium 200 CPU or higher • CD-ROM for driver installation • USB2.0/1.1 interface • 32 MB memory Software Requirements • Microsoft Windows 98SE/2000/ME/XP • MAC OS 8.5+ or higher version. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 24: Physical Description

    Please refer to the following illustrations to identify the components of the ViewDock. Front View Sub-Woofer iPod connector USB Hub Power Phone Jack Volume Control Rear view USB Hub Audio In Power Jack Card Reader Audio Out USB Connector VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 25: Card Reader Installation

    3. After completing installation, connect the ViewDock to your PC's USB port. The card reader is now operational. 4. Each slot of the card reader will be recognized as a Removable Disk and the icon will be shown in "My Computer." VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 26: Usb Hub Installation

    2. Select the "Device Manager" tab from System Properties dialog window. 3. Select "Other devices" to see the contents. 4. Select "Unknown device" and click "Remove" button. 5. Click the "Refresh" button and system will find a new device. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 27 4. In order to obtain the optimum listening environment, please adjust the volume of stereo speakers in the monitor head via the monitor OSD menu to match and balance the subwoofer volume. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 28: Circuit Description

    Q801, R816, R817 and ZD803 make up of dummy loading circuit. For start-up sequence, during 5V output take place high loading first, this dummy loading circuit operated to insure 14V not be increased. 4. 2 Inverter Circuit VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 29 U106 is a flash memory, U106 # 2, # 1, # 6, # 5 are the communications with U105 # 37-# 40. U108 is EEPROM used for saving user’s OSD setting. U108 is connected by SCL and SDA pin with # 44 and # 43 of TSUM16AL. 4.2.3 VGA Input VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 30 24.700 640*480@50Hz 19.760 − 50.000 − 31.469 VESA 25.175 640*480@60Hz − 59.940 − 35.000 640*480@67Hz 30.240 − 66.667 − 37.861 VESA 31.500 640*480@72Hz − 72.809 − 37.500 VESA 31.500 640*480@75Hz − 75.000 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 31 108.000 1280*960@60Hz 60.000 1000 75.000 1800 1280 1280*960@75Hz 130.000 75.000 1000 VESA 63.981 1688 1280 108.000 1280*1024@60Hz 60.020 1066 1024 VESA 79.976 1688 1280 1280*1024@75Hz 75.025 1066 1024 135.000 75.025 1066 1024 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 32 Description Live Neutral P801 Inner Connector Pin Assignment 4.7.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent) Symbol Description H.V. High voltage for lamp L.V. Low voltage for lamp VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 33 2(LVDS) RXO2+ plus signal of odd channel 2(LVDS) Ground RXOC- minus signal of odd clock channel (LVDS) RXOC+ plus signal of odd clock channel (LVDS) RXO3- minus signal of odd channel 3(LVDS) VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 34 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) VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 35 Timing resistor and capacitor for operation and striking frequency GNDA Ground for analog signals DRV2 Drive output PGND Ground for power paths 4.8.3 U105(TSUM56AL-1) Symbol Description Not connected Ground Not connected Not connected Ground Not connected Not connected VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 36 A-Link Positive LVDS Differential Data Output LVA3M A-Link Negative LVDS Differential Data Output VDDP Digital Output Power Ground LVACKP A-Link Positive LVDS Differential Clock Output LVACKM A-Link Negative LVDS Differential Clock Output VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 37 General Purpose Input/Output; 4mA driving strength Crystal Oscillator Input XOUT Crystal Oscillator Output AVDD_MPLL MPLL Power General Purpose Input/Output; 4mA driving strength/ GPIO_P16/PWM2 Pulse Width Modulation Output; 4mA driving strength Not connected VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 38: Adjustment Procedure

    Brightness (+ / -) Volume Volume (+ / -) Audio Mute On/Off sRGB 9300K 6500K Color Adjust 5400K Red (+ / -) User Color Green (+ / -) Blue (+ / -) VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 39 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 5.3.3 Power lock Menu function Power Lock Menu Function Check Item Method Phenomenon VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 40: Factory Mode Introduction

    Burn-in pattern until plug in VGA Cable or press the power key to turn the monitor off and then turn it on. Auto Color (Automatically calibrate chip ADC parameter by using chip VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 41: Internal Dac

    5.7.1 Connect ISP board between monitor and PC as below configure LCD Monitor Service D-Sub cable ISP Board Insert to Print Port 25pin 5.7.2 Using mStar ISP Tool Update FW: (1). Select “Read”, Choose the corresponding firmware, load to MCU. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 42 (2). Select “Connect”, auto connect for ISP. (3). Select “Run”, start ISP. (4). When the picture show “Verify OK”, ISP finished. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 43 Power Check power consumption at each modes Power saving meter State Power Consumption LED color AC input: 230V/50Hz Normal ≤ 42W Blue Stand By < 2W Orange Power Key Off ＜1Ｗ VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 44: Packing Procedure

    (Figure 3) P ower adapter iP od adapter AUDIO CABLE P OWER CABLE 2 in 1 audio cable USB cable DVI cable D-sub cable MONITOR HEAD Figure 3 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 45: Disassembly Procedure

    Disassembly Procedure iBox Hinge Cover Front Cover VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 46 BACK COVER PANEL VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 47 CHASSIS P/I BOARD I/F BOARD KEYPAD BOARD SPEAKER LVDS KEY-POWER CABLE VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 48: Troubleshooting Flow Chart

    If you find the vertical line or horizontal line lost on the screen, please change panel. If you find the speaker don’t working, please don’t plug in audio cable, unless change new speaker. VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 49 Check pin6 of IC802 CheckC810,D803,C807, voltage about 12V Check pin2 of IC802 Check primary OVP, OLP voltage about 2V and secondary feedback, Check R811, R810, Check pin1 of IC802 R809, R808,R814 voltage is below 1V VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 50 Check pin2 of Check R818, D804, C807 if IC802 voltage short is 3V Change R818, D804, C807 Check pin1 of Change R808, R 809, IC802 voltage R810, R 811, R815, below 1V VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 51 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 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 52 Check reset (pin84) of Check C144,R172 U105 Check crystal (pin 96,97) Check waveform of U105 X101,C153,C154 Check CCFL- Check pin4 of Enable(pin 85) Inverter Fail CN101 of U105 Check R167,Q106, U105 FAIL R108,R110 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 53 Pin 2 of U101 and Pin 2 U101, U102 Fail of U102 Check Reset Waveform Check C144 and (Pin 84 of U105) R172 Check Crystal Waveform Check X101, (Pin 96,97 of U105) C153, C154 U105 (TSUM16AL) Fail VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 54 6.7. White Screen White screen LVDS Cable Workmanship Reinsert Change LVDS cable NG LVDSCable Check VLCD Check LVDS Panel Fail is 5V signal Check Panel-Enable of U105 Fail U105(pin48) Check Q101,Q103,Q110, C108, C109 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 55 6.8. Bad Screen Bad Screen LVDS Cable Workmanship Reinsert Change LVDS LVDS Cable NG Cable Check Crystal: CheckX101, C153, pin96,97 of U105 C154 Check the pins of U105 VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 56: Recommended Spare Parts List

    Remark 1: Above listed items are examples, supplier can expand the rows to add more necessary items. 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 57 BOM LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1b Serial No. Prefix: QCY Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 506380002100R TAPE,WRAPPING TYPE(VIEWSONIC),50mmx75M,L 0.01 P-00008170 506120301700R BAG,EPE+PE,L620xW510xT0.6mm, LE1925 506431003100R FILM,PROTECTION,UNPRINTED,430x280x0.1mm, 506431000300R FILM,PE 500mmx900M ROHS 0.002 P-00008184 506020012510R...

  • Page 58: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 59 EXPLODED PARTS LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1b Serial No. Prefix: QCY Item ViewSonic P/N Ref. P/N Description Q'ty C-00008190 714030007910R ASSY, BEZEL,LP1909 E-00008016 631102090600R LCD PANEL 19" MT190AW01-V0-G1,AM19000040 B-00008171 790741400600R PCBA,P/I BOARD, LP1909-612 B-00008169 790741300600R PCBA,I/F BOARD, LP1909-612...
  • Page 60 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 61 PACKING PART LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 506431000300R FILM, PE500mm*900M ROHS 0.0018 506039004600R CORNER PAPER,2060*50*50*T5mm,LE1712 4/32 506039005000R CORNER PAPER,870*50*50*T5mm, LE1918 4/32 P-00008186 506040010130R CUSHION, EPS-R,VX1945,LP1911 A-00008068 704300000200R KIT,POWER ADAPTOR FOR BASE LP1911...

  • Page 62: Block Diagram

    9. Block Diagram VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 63 FB701 600Ω 470u/16V R704 MUTE +14V VAROUT_R STBY VAROUT_L +14V R706 VOLUME Q703 PMBT3904 R705 R708 Q701 MUTE PMBT3904 +14V R713 R714 Q702 VOL_C PMBT3904 ViewSonic Corporation Model Audio Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 64 R191 R106 R162 LED_A_C Q102 R101 LED_A//LED_B PMBT3906 CN105 LED_A//LED_B LED_G//LED_O POWER MENU_UP//Key_▲ DOWN_EXIT//Key_▼&2 KEY_1 C161 C162 2x4P 2.0mm From keypad 1000p/50V 1000p/50V ViewSonic Corporation Model DC to DC Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 65 CN901 R901 8P 1.5mm 90° From IF BD LED901 SW901 SW902 SW903 SW904 SW905 LED Y/B TACT-4.3 TACT-4.3 TACT-4.3 TACT-4.3 TACT-4.3 POWER ▼ ViewSonic Corporation Model Keypad Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 66 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 D103 DVI5V PC5V_VGA VCC3.3 VCC3.3 D102 BAV70 BAV70 C128 U103 0.1/50V U104 DDCA_SCL R151 DDCA_SDA SCL_DVI SDA_DVI CAT24WC02W ViewSonic Corporation CAT24WC02W Model Input Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 67 60Ω LVA3M VCC5V LVA3P C144 10u/25V R170 VLCD R171 C140 X101 R172 1u/16V 14.31818MHz VCC3.3 U108 U109 R178 100 I2C_MCL HDCP_WP I2C_MDA ViewSonic Corporation R179 AT24C04N AT24C04N/NC Model SCALER Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 68 R501 0.1/50V SN4148 D513 SN4148 2200p/50V 2700p/50V 100K 1% C524 R528 R533 390 1% 15K 1% R518 0.068/50V 470K 1% C518 0.1/50V R519 C519 0.1/50V ViewSonic Corporation Model Interter Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 69 F801 0.1/50V 2A/250V C824 C827 0.1/50V NC 47u/25V CN801 P801 VCC5V ON/OFF BRIGHTNESS AC_SKT Volume Audio_MUTE ViewSonic Corporation 60mm 8P TO SCALER BD CN101 C825 Model 0.1/50V POWER SUPPLY Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 70 11. PCB Layout Diagrams ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 71 ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 72 ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...
  • Page 73 ViewSonic Corporation Confidential - Do Not Copy VX1945wm-3...

  • Page 74: Schematic Diagrams

    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) VX1945wm-3 ViewSonic Corporation Confidential - Do Not Copy...

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