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ViewSonic VX1935wm-3 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VX1935wm-3
Model No. VS11444
19" Color TFT LCD Display
(VX1935wm-3_SM Rev. 1a Oct. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VX1935wm-3

  • Page 1: Service Manual

    Service Manual ViewSonic VX1935wm-3 Model No. VS11444 19” Color TFT LCD Display (VX1935wm-3_SM Rev. 1a 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 VX1935wm-3 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. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 5 Handling and Placing Methods ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 6 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 7: Specification

    2. Specification INTRODUCTION FEATURES VX1935wm-3 Size 19 " wide TFTLCD PANEL 300 cd/㎡ Luminance (Typ) Contrast Ratio (Typ) 700:1 Colors 16.2 M (6 bits + 2 bits FRC) Innolux Response Time 5 ms(on/off) MT190AW01 V.0 Viewing Angle (H/V) 160 ° / 160 °...

  • Page 8: General Specification

    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 Leakage Current 3.5mA (Max) at 254VAC / 60Hz ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 9 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 10 800 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 1280x768@50Hz by [1]+[2] short cut key ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 11 ● The monitor needs to do “Auto Adjust” the first time a new mode is detected (see section “0-Touch™ Function Actions”) ● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 12 3 seconds showing "Power Button Locked". It also means that with the power button locked, the LCD would automatically turn back ViewSonic Corporation VX1935wm-3...
  • Page 13 Defaults Contrast Input Priority Brightness 100% Resolution Notice Enabled Color Temperature 6500K Volume Sharpness 100% Balance OSD H. Position Treble OSD V. Position Bass OSD Time Out 15 Sec OSD Background Enabled ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 14 16.2 million colors (6 bits + 2 bits FRC) Color Depth 40,000 Hrs (Min) Backlight Life INPUT RGB Analog (75 ohms, 0.7 Vp-p); DVI-D Video SIGNAL Sync H/V Separated (TTL), Composite, SOG :30~82kHz, F :50~85Hz ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 15 Resolution, H Frequency, V Frequency, Pixel Clock, Serial Number, Model Number, “www.ViewSonic.com” Manual Image Adjust Horizontal. Size , H/V. Position , Fine Tune , Sharpness Setup Menu Language [English, French, German, Italian, Spanish, Finnish, Japanese, ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 16 4.7kg (10.4 lbs) 6.7kg (14.8 lbs) Gross REGULATIO Global: CB, MPR II, WEEE,ROHS , ISO13406-2 VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star VSE:TUV/ERGO,CE ,GOST-R+Hygienic ,SASO , ENERGY VSI: BSMI, CCC, PSB, C-TICK, MIC VSCN:CCC ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 17 15 Pin VGA Video Cable DVI-D Cable Audio Cable Quick Start Guide ViewSonic Wizard CD-ROM w/ 17 Language User Guide EU Packaging 1. Weight of the individual (empty) shipping carton. ---------- Weight =903 g/box Information 2. Weight and materials of the poly foam ------ Weight = 200g/piece, 2 pieces per box, Material = EPS 3.

  • Page 18: 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. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 19 • 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 VX1935wm-3 Confidential - Do Not Copy...

  • Page 20: 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). ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 21 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 22 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. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 23 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 VX1935wm-3 Confidential - Do Not Copy...

  • Page 24: Circuit Description

    IC802 output will be disabled. 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 25: Inverter Circuit

    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 Signal R, G, B input through CN103 #1, #2, #3, and C112, C113 and C114 filtering the high frequency ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 26: Button Control

    LED indicator is green. b. When in power-saving mode, U105 # 91 is pulled high and U105 # 92 is pulled down, so Q105 is conducted and the LED indicator is orange. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 27: Factory Preset Timing Table

    − 49.725 1152 57.283 832*624@75Hz − 74.550 − VESA 48.363 1344 1024 65.000 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 28 108.000 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 79.976 VESA 1688 1280 1280*1024@75Hz 75.025 1066 1024 135.000 75.025 1066 1024 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 29 The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency. T1 (ms) T2 (ms) T3 (ms) T4 (ms) T5 (ms) T6 (ms) T7 (ms) 0.1~10 0.5~10 >200 >100 0~50 0.1~25 >1000 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 30: 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 31 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) ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 32 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 33 General Purpose Input/Output; 4mA driving strength/Pulse Width GPIO_P15/PWM0 Modulation Output; 4mA driving strength Not Connected SPI Flash Serial Data Output SPI Flash Chip Select SPI Flash Serial Clock SPI Flash Serial Data Input Not Connected Not Connected ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 34 LVB1M B-Link Negative LVDS Differential Data Output VDDP Digital Output Power Ground LVB0P B-Link Positive LVDS Differential Data Output LVB0M B-Link Negative LVDS Differential Data Output Ground BYPASS For External Bypass Capacitor ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 35 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 36: Adjustment Procedure

    Brightness (+ / -) Volume Volume (+ / -) Audio Mute On/Off sRGB 9300K 6500K Color Adjust 5400K Red (+ / -) User Color Green (+ / -) Blue (+ / -) ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 37 When the OSD is locked will lock all functions. 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 38: Factory Mode Introduction

    : Automatically calibrate chip ADC parameter by using chip internal DAC Color Temperature : The R, G, B of 9300K and 6500K and 5400K and User Mode Colors are all generated from scaling back end. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 39: Internal Dac

    3. Pull out AC power cable or press power key to restart. Upload firmware to MCU via VGA Cable 5.7.1 Connect ISP board between monitor and PC as below configure LCD Monitor Service D-Sub ISP Board cable Insert to Print Port 25pin ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 40 5.7.2 Using mStar ISP Tool Update FW: (1). Select “Read”, Choose the corresponding firmware, load to MCU. (2). Select “Connect”, auto connect for ISP. (3). Select “Run”, start ISP. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 41 Modes switching Chroma Signal saving signal. check Generator 2. Confirm the above timing modes must be full screen and the picture must be normal. 3. LED is Orange at power saving mode. ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 42 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 43 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) BASE DVI CABLE AUDIO MONITOR Figure 3 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 44 Disassembly Procedure BASE HINGE COVER ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 45 STAND FRONT COVER ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 46 BACK COVER PANEL ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 47 CHASSIS P/I BOARD I/F BOARD KEYPAD BOARD SPEAKER LVDS KEY-POWER CABLE ViewSonic Corporation VX1935wm-3 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. ViewSonic Corporation VX1935wm-3 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 ViewSonic Corporation VX1935wm-3 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 ViewSonic Corporation VX1935wm-3 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 ViewSonic Corporation VX1935wm-3 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 ViewSonic Corporation VX1935wm-3 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 54 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 55 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 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 56: 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 57 BOM LIST (VX1935wm-3) ViewSonic Model Number: VS11444 Rev: 1a Serial No. Prefix: QCX Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 506380002100R TAPE,WRAPPING TYPE(VIEWSONIC),50mmx75M,L 0.513 506380001800R TAPE,WRAPPING TYPE,48mmx50M ROHS LE1915 P-00008032 506120302400R BAG,EPE+PE,L540xW500xT0.05mm,PRINTED, LE P-00008181 506120006200R BAG,PLASTIC,W(545+165)xL1100xT0.05mm,LE1 P-00008182 506120303000R BAG,EPE+PE,W330xL300xT0.3mm,CYCLE PRINTE...
  • Page 58 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 506390500100R LABEL,ENERGY STAR, LE1709 C-00008191 714050007910R ASSY,BACK COVER, LP1909 501020210210R COVER,BACK, LP1909 506430300003R FILM,PET,L115xW30xT0.05mm, LE1741 714078661000R ASSY,PANEL(V0/G1&2&3),W/SPK,LP1909-6I2 HW-00005270 509000000700R BOLT,#4-40x11.8,Ni FOR D-SUB/DVI CONN.RO 509146304200R SCREW,P,CROSS,W/WAS,M3*4,Zn-Cc,ROHS HW-00005269 509146305300R SCREW,PW,CROSS,W/WAS,M3*5,NI 509146306102R SCREW,P,CROSS W/W-SPR,M3*6,Zn,ROHS...

  • Page 59: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 60 EXPLODED PARTS LIST (VX1935wm-3) ViewSonic Model Number: VS11444 Rev: 1a Serial No. Prefix: QCX 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 61 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 62 PACKING PART LIST (VX1935wm-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,2035*50*50*T3mm 4/56 506039005000R CORNER PAPER,870*50*50*T5mm, LE1918 4/56 P-00008179 506040010110R CUSHION, EPS-R,VX1935,LP1909 CB-00008002 453030300120R CABLE,AUDIO 1P 6FT BLACK/GREEN CP03B06P0...

  • Page 63: Block Diagram

    9. Block Diagram ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 64 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 65 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 66 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 67 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 68 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 69 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 70 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 VX1935wm-3 Confidential - Do Not Copy...
  • Page 71 11. PCB Layout Diagrams ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 72 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 73 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...
  • Page 74 ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

  • Page 75: 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) ViewSonic Corporation VX1935wm-3 Confidential - Do Not Copy...

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