ViewSonic VS11354 Service Manual
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ViewSonic VS11354 Service Manual

ViewSonic VS11354 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VG1921wm-2
Model No. VS11354
19" Color TFT LCD Display
(VG1921wm-2_SM Rev. 1a Sep. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VS11354

  • Page 1: Service Manual

    Service Manual ViewSonic VG1921wm-2 Model No. VS11354 19” Color TFT LCD Display (VG1921wm-2_SM Rev. 1a Sep. 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 VG1921wm-2 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. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 5 4. Handling and Placing Methods VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 6 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 7: Specification

    DB-15 (Analog), refer the appendix A Equal to twice the weight of the monitor for five Video Cable Strain Relief minutes Video Cable Connector DB-15 Pin out Compliant DDC 1/2B Video Signals Video RGB (Analog) – Separate, VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 8: Power Supply

    1.8m. Connects to display. Color = Black VESA DPMS Signaling Power Saving Operation(Method) On Mode <42 W (max) Power Consumption Off Mode< 1W Recovery Time On Mode = N/A, Active Off < 3 sec VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 9 1152 x 900 @ 67 Hz, 62.5 KHz For SUN 1280 x 720 @ 50 Hz, 37.5 KHz 1280 x 720 @ 60 Hz, 45 KHz 1280 x 768 @ 50 Hz, 39.6 KHz VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 10: User Presets

    OSD Lock [1] + [▼] + [2] Disable Theft Defence function [▲]+ [ ] + Main Power On All reset No signal + [ ] + [2] Burning mode + Main Power on VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 11: Main Menu Controls

    2. It should be reset by Memory Recall function(Should not reset by power off, power unplug and others) OSD Auto Save The OSD shall save new settings when it is turned off by the user or when it times out. There shall not be a separate save VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 12: Front Panel Function Control Description

    Scrolls through menu options and adjusts the displayed control. Also a shortcut to display the Contrast adjustment control screen. Displays the control screen for the highlighted control. Also toggles between two controls on some screens. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 13 • 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.) VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 14 7500K-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. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 15 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 16 OSD Timeout sets the length of time the OSD screen is displayed. For example, with a “30 second” setting, if a control is not pushed within 30 seconds, the display screen disappears. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 17: Circuit Description

    LCT pin is set to a DC voltage of 0.7V by using a resistor divider(R507, R516), change the duty of PWM pulse, will regulate the lamp current. The ON/OFF voltage connect to pin10 of IC501 through D501, R501, A voltage of VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 18: Button Control

    LED indicator on the front bezel is defined as follows: a. When press button “Key-Power”, U105 # 91 is pulled down and U105 # 92 is pulled high, so Q102 is conducted and the LED indicator is green. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 19: Factory Preset Timing Table

    1024*768@60Hz − 60.004 − VESA 56.476 1328 1024 75.000 1024*768@70Hz − 70.069 VESA 60.023 1312 1024 78.750 1024*768@75Hz 75.029 VESA 68.677 1376 1024 94.500 1024*768@85Hz 84.997 − 1024*768@72Hz 57.700 1360 1024 78.472 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 20 LED indicator on the front bezel is defined as follows: a. When press button “Key-Power”, U105 # 91 is pulled down and U105 # 92 is pulled high, so Q102 is conducted and the LED indicator is green. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 21: Ac Outlet Pin Assignment

    DC power on/off control, KEY_UP&▲ OSD “▲” control to adjust value to increase, KEY_DOWN&2 Select control and auto adjustment control, OSD “▼” control to adjust value to decrease KEY_1 OSD menu and exit VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 22 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) VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 23 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) VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 24 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 AVDD_DC ADC Power Not connected Not connected Ground Not connected VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 25 Not Connected Not connected Not connected General Purpose Input/Output; 4mA driving GPIO_P27/PWM1 strength/Pulse Width Modulation Output; 4mA driving strength VDDP Digital Output Power Ground VDDC Digital Core Power MODE[0] Chip Configuration Input VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 26 Pulse Width Modulation Output; 4mA driving strength/General Purpose Input/Output; 4mA driving PWM1/GPIO_P25 strength RSTN Chip Reset; Low Reset General Purpose Input/Output; 4mA driving GPIO_P00/SAR1 strength/SAR ADC Input General Purpose Input/Output; 4mA driving GPIO_P01/SAR2 strength/SAR ADC Input VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 27 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 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 28: Adjustment Procedure

    Green (+ / -) Blue (+ / -) Information Manual Image Adjust H Position (+ / -) H/V Position V Position (+ / -) H Size + / - Fine Tune + / - VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 29 Phenomenon Resolution Notice OSD should show screen after changing Activate Resolution non-native mode for 30 sec, ------ Notice Menu And it should disappear after 10s or by pushing button [1] or [2] VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 30: Factory Mode Introduction

    7. Upload firmware to MCU via VGA Cable 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 CON on PC VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 31 7.2 Using mStar ISP Tool Update FW: (1). Seletct “Read”, Choose the corresponding firmware, load to MCU. (2). Select “Connect”, auto connect for ISP. (3). Select “Run”, start ISP. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 32 1. Set input mode to 1280x1024@60Hz 2. Set Pattern to 32 gray shades Chroma Contrast Check 3. Set contrast to the max. The brightest 6~8 shades brightness cannot Signal Generator be distinguished. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 33 Power Check power consumption at each modes Power saving meter State Power Consumption LED color AC input: 230V/50Hz Normal ≤ 42W Green Stand By < 2W Orange Power Key Off ＜1Ｗ VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 34 1.4 Place the monitor into the carton and then put all the accessories into the carton. At last, close the carton and seal it with tape. (Figure 3) Moniter Head VGA cable Power cord Audio cable Base Figure 3 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 35: Disassembly Procedure

    Disassembly Procedure VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 36 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 37 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 38 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 39: 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. VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 40 12V Check pin2 of IC802 Check primary OVP, OLP and secondary feedback, voltage about 2V OVP circuit Check R811, R810, Check pin1 of IC802 R809, R808,R814 voltage is below 1V VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 41 Check R819, R820 Check pin2 of Check R818, D804, C807 IC802 voltage if short is 3V Change R818, D804, Check pin1 of Change R808, R 809, IC802 voltage R810, R 811, R815, below 1V VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 42: Output Power Is Unstable

    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 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 43 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 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 44 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 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 45: White Screen

    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 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 46: Bad Screen

    L V D S C able N G C able C heck C rystal: C heckX 101, C 153, pin96,97 of U 105 C 154 C heck the pins of U 105 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 47: 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 48 BOM LIST (VG1921WM-2) ViewSonic Model Number: VS11354 Serial No. Prefix:QAB Rev.: 1a Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty P-00008029 506040009610R CUSHION,EPS-R, LE1941 P-00008030 506040009600R CUSHION,EPS-L, LE1941 P-00006741 506120002510R BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN P-00008032 506120302400R BAG,EPE+PE,L540xW500xT0.05mm,PRINTED, LE 506039006200R CORNER PAPER,1100x50x50xT3mm, LE1513 ROH 5.556...

  • Page 49: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 50 EXPLODED PARTS LIST (VG1921wm-2) ViewSonic Model Number: VS11354 Rev: 1a Serial No. Prefix: QAB Item ViewSonic P/N Ref. P/N Description Q'ty C-00008035 714030007200R BEZEL SUB-ASS'Y 501010207500R BEZEL , FRONT, LE1941 (BLACK & SILVER 877C) 501030204300R POWER BUTTON 501120104400R LENS, LE1941...
  • Page 51 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 52 PACKING PART LIST ( VG1921wm-2 ) ViewSonic Model Number: VS11354 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 506431000300R FILM.PE500mm*900m ,ROHS 0.0025 506039003600R CORNER PAPER,1980*50*50mm*T5mm 4/72 506039006200R CORNER PAPER,1100*50*50mm*T5mm 4/72 P-00008029 506040009610R CUSHION,EPS-R,LE1941 CB-00008002 453030300120R CABLE,AUDIO 1P 6FT BLACK/GREEN CP03B06P0...

  • Page 53: Block Diagram

    9. Block Diagram On/Off Brightness Power VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 54 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_Mute&▲ DOWN_EXIT//Key_▼&2 KEY_1 C161 C162 2x4P 2.0mm From keypad ViewSonic Corporation 1000p/50V 1000p/50V Model Title Dc to Dc Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 55 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 ViewSonic Corporation DDCA_SDA SCL_DVI SDA_DVI CAT24WC02W Model CAT24WC02W Title Input Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 56 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 ViewSonic Corporation HDCP_WP I2C_MDA R179 AT24C04N AT24C04N/NC Model Title Scaler Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 57 SW901 SW902 SW903 SW904 SW905 SW906 SW TACT SW TACT SW TACT SW TACT SW TACT SW TACT MUTE ▼ POWER ViewSonic Corporation Model Title Keypad & Power key Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 58 Q703 R705 PMBT3904 Volume R708 R707 Q701 MUTE PMBT3904 +14V R713 C701 change to 220uF from 470uF for svr rise up earlier R714 Q702 PMBT3904 ViewSonic Corporation Model Title Audio Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 59 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 Title Inverter Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 60 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 4 ViewSonic Corporation 60mm 8P TO SCALER BD CN101 C825 Model 0.1/50V Power Title Date Rev: VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 61 11. PCB Layout Diagrams VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 62 VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 63: 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) VG1921wm-2 ViewSonic Corporation Confidential - Do Not Copy...

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