ViewSonic VE1920wmb-2 Service Manual
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ViewSonic VE1920wmb-2 Service Manual

ViewSonic VE1920wmb-2 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VE1920wmb-2
Model No. VS10866
19" Color TFT LCD Display
(VA1920wmb-2_SM Rev. 1a Aug. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VE1920wmb-2 Model No. VS10866 19” Color TFT LCD Display (VA1920wmb-2_SM Rev. 1a Aug. 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 VE1920wmb-2 Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    (14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950 or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 5: Viewsonic Corporation

    Take out the monitor by grasping the LCD panel. That may cause “ MURA“. Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects . That could scratch the surface of panel ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 6: Specification

    / PSB / C-Tick / Korea (MIC) / CCC GENERAL specification Test Resolution & Frequency 1440 x 900 @ 60Hz Test Image Size Full Size Factory Default: Contrast and Brightness Controls Contrast = 70%, Brightness = 100% ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 7 Power Supply Missing Cycle Immunity artifacts, when ½ cycle of AC power is randomly missing at nominal input Power Supply Acoustics The power supply shall not produce audible noise that would be ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 8 800 x 600 @ 72Hz, 48.1kHz 800 x 600 @ 85Hz, 53.7kHz 832 x 624 @ 75Hz, 49.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 70Hz, 56.5kHz 1024 x 768 @ 72Hz, 58.1kHz ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 9 ● The monitor needs to do “Auto Adjust” the first time a new mode is detected but except the DOS mode 640 x 350, 720 x 400 & 640 x 400.(see section “0-Touch™ Function Actions”) ● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 10: Front Panel Function Control Description

    White Balance. (Not shown on user’s guide) [1] + [▼] Power Lock [1] + [▲] OSD Lock [ X] Audio Mute on /off Remark : All the short cuts function are only available while OSD off ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 11 , Mute* Color Adjust sRGB, 9300K, 6500K(default), 5400, 5000, User Color [R, G, B] Information H Frequency, V Frequency, Resolution, Pixel Clock, Serial Number, Model Number, “www.ViewSonic.com” Manual Image Adjust H. Size* , H./V. Position* , Fine Tune* , Sharpness*...
  • Page 12 Connector PC99 requirement Audio in Cable type / length 3.5mm stereo cable / 1.8m length NOTE: THERE IS NO GUARANTEE <1 W POWER Audio DPMS CONSUMPTION IN ACTIVE OFF MODE, WHEN THE AUDIO CABLE IS CONNECTED ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 13 Setup Menu Simplified Chinese Traditional Chinese Resolution Notice On/Off Input Priority On/Off H Position (+ / -) OSD Position V Position (+ / -) OSD Time Out 5/15/30/60 OSD Background On/Off Memory Recall ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 14: Circuit Description

    The TSUM57AK also incorporates a new Dynamic Frame Rate (DFR) generator for the digital output video to the display panel that preserves the advantages of a fixed output clock rate, while eliminating the output end of frame short-line. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 15: Adjustment Procedure

    Test Pattern: Window standard pattern Inspection Item: Line Defect, Function Defect & Mura 7. 25 Gray Test Signal: 1280*1024@60Hz Test Pattern: Full Screen 25% White (Gray) Inspection Item: Particle, Line Defect & Mura ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 16 Inspection Item: Bright Dot, Partial & Line Defect 14. Gray_Scale_0-100_V64 Test Signal: 1280*1024@60Hz Test Pattern: Vertical 64 (256) Gray Scale (Right → Left，From 0 to 100% White) Inspection Item: Line Defect & Function Defect ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 17 Full Screen 50% Red Figure 4 Green Full Screen 50% Green Figure 5 Blue Full Screen 50% Blue Figure6 White Full Screen White Figure7 Black_Tile Black Tile Under White Background Figure 8 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 18 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 19 Take the cable of Print Port to connect Print Port of PC and Print Port of fixture(and EDID burn in the same fixture) to connect VGA Cable between D-sub of fixture and D-sub of AD Board of monitor，the monitor must be turned on the power。 Step 2 : Open ISP Tool ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 20 ”確定”。 Step 4: Press ”Read” then enter as below figure，then press to down load the program of BIOS (*.bin)。 If down load BIOS that is successful as below figure then press”確定”。 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 21 BIOS procedure。 The BIOS procedure is displayed the message ”Verify OK” that the BIOS procedure is successful。 Step 6 : Press ”Dis Con” then leave the mode of ISP。 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 22 Step 7： When select ”ReConnect” and press “Run” then repeat to connect the mode of ISP into next the action of BIOS procedure ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 23 Step 1 : Press Stand Assy’s bottom part in Seat Hinge Step 2: Remove Seat Assy 1.2 Separate Stand Assy Step 1 : Loose and Remove 2 screws Step 2 : Remove Stand Assy ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 24 Remove Cover Hinge Step 2 : Loose and Remove 2 screws Step 3 : Separate Bezel hooks to take Bezel and Rear Cover apart. Step 4 : Remove Rear Cover Step 5 : Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 25 Loose and remove 4 screws. Step 3 : Lift up LCD module and remove bezel. Step 4 : Remove 2 pieces of Backlight wires. Step 5 : Remove 2 pieces of Backlight wires. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 26 Loose and remove 2 screws. Step 8 : Loose and remove 4 screws. Step 9 : Remove the PCBA Cover 3.2 Remove Power Board and AD Board Step 1 : Loose and remove 4 screws. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 27 Remove Lips Board Step 3 : Remove 2 pieces of FFCs. Step 4 : Remove the FFC. Step 5 : Loose and remove 4 screws. Step 6 : Remove AD PCBA. Step7 : Completed. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 28 And fasten 4 fixed screws. Step 2 : Fasten 4 fixed screws. Step 3 : Insert FFC. Step 4 : Insert 2 pieces of FFCs . Step 5 : Insert new Lips Board. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 29 Step 6 : Fasten 4 fixed screws. Step 7 :Completed. 5 Remove OSD Board Step 1 : Separate both Audio Cable. Step 2 : Take OSD Board apart. Step 3: Completed. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 30 New OSD Board. Step 3: Completed. 7 Add Cover to AD PCB Heatsink Step 1 : Join the PCB Cover. Step 2 : Fasten 4 fixed screws. Step 3 : Fasten 2 fixed screws ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 31 Step 5 : Insert 2 pieces of Backlight wires. Step 6 : Insert 2 pieces of Backlight. wires. Step 7 : Join LCD module and remove bezel. Step 8 : Fasten 4 fixed screws. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 32 Step 9 : Insert FFC. Step 10 : Completed. 8 Rear Cover Assy Assembly Step 1 : Place Rear Cover Step 2 : Fasten 2 screws Step 3 : Remove Cover Hinge ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 33 9 Stand Assy Assembly Step 1: Place Seat Assy Step 2 : Fasten 4 screws Step 3: Join Seat Assy ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 34 1.4 Place the monitor into the carton and then put all the accessories into the carton. As last, close the carton and seal it with tape. (Figure 4) Figure 4 Figure 3 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 35: Troubleshooting Flow Chart

    Bright Dot Display Dark Dot Backlight Light Leakage Mura Panel Change Check Panel Image Sticking Brightness spot Particle Dot Defect Image Remain Group Bright Dots Others Cosmetics Defect TEST Next Step Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 36 Panel Change Check Panel Beat Display Shut Down AD/B Change Display Wave Check PCBA Power/B Change CNT/B Change Check Panel Panel Change No Backlight Check Adapter Adapter Change TEST Next Step Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 37 Check Adapter Adapter Change No signal AD/B Change Check PCBA CNT/B Change R.G.B Display Abnormal VGA cable Check Wire Gray Scale DVI cable Display Check Panel Panel Change Abnormal TEST Next Step Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 38 Vertical Check Panel Panel Change Band Defect Horizontal Band Defect Power Saving Display Check PCBA AD/B Change Abnormal AD/B Change Power/B Change Peculiar Smell Check PCBA Inverter/B Change TEST Next Step Complete ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 39 Power/B Change LED Off Check PCBA Abnormal Inverter/B LED Dark OSD/B Change LED Abnormal OSD Cable Check Wire LED Loss DC Power CNT Cable Change LED Flicker Adapter Change TEST Next Step Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 40 CNT/B Change Abnormal Power/B Change Loud Check PCBA Inverter/B Change Abnormal OSD/B Change Check Wire No Voice OSD Cable Change Loudspeaker L/R Same Check Loudspeaker Change Volume Loudspeaker Next Step TEST Noise Completed ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 41 AD/B Change Display Abnormal EDID Update Check EDID Code Check PCBA TV /B Change TV Function Check Wire Display AV Cable Change Abnormal Remote controller Check Controller Change TEST Next Step Complete ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 42 Use OSD Color Menu to adjust color setting. Dark area distorted Use OSD Color Menu to adjust color setting. White color is not white Use OSD Color Menu to adjust color setting. ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 43: Recommended Spare Parts List

    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. ViewSonic Corporation...
  • Page 44 Cushion, A190A2-H0C, EPS, White, 464 mmx180 mmx220 mm, Telung, PS_Foam(Right), Green II 78-D009100 P-00006049 79-D009099 Shipping Package Information for , A190A2-H0C, Viewsonic Cushion, A190A2-H0C, EPS, White, 464 mmx180 mmx220 mm, Telung, PS_Foam(Left), Green II 78-D009098 P-00006050 Warranty Card, A170E1-H0G, 143 mmx210 mm, Yi Ching/Car Tong Kunshan, VSC_VA712 Ver.2,...

  • Page 45: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List EXPLODED PARTS LIST (VE1920wmb-2) ViewSonic Model Number: VS10866 Rev: 1a Item ViewSonic P/N Reference P/N Description Q'ty 44-D003904 BACKLIGHT ASSY E-00005747 MJ0A10AK01 PANEL ASSY 41-D004053 BACKLIGHT FRONT COVER HW-00000553 42A9930008 SCREW M3*4L B-00006039...
  • Page 46 PACKING PART LIST ( VE1920wmb-2 ) ViewSonic Model Number: VS10866 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty VE1920wmb LCD Monitor P-00000595 7841919921 PE Foam Bag P-00006049 78-D009100 PS Foam (Right) P-00006050 78-D009098 PS Foam (Left) Different region (refer to BOM)

  • Page 47: Block Diagram

    9. Block Diagram Speaker OSD Key Pad / Audio Out 3.3V DVI-D Digital Video Main Board LCD Module D-sub Analog Video Signal DC-12V DC-5V LIPS AC Power Backlight Audio In ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 48: Schematic Diagrams

    AUDIOR- DCDC_ON/OFF AUD_DET V12A AUD_DET V12A V33P V33P V33P V33P VOL_ADJ VOL_ADJ POWER V33C AUDIO_ON LED_GL V18C V33C V12A V12A INV_ON/OFF INV_ON/OFF INV_ADJ INV_ADJ ViewSonic Corporation Model SYSTEM DIAGRAM Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 49 SAR21 R200 R200 R139 R139 MENU POWER MENU 1.24V 0603/10M/5%/RoHS/OPEN 0603/10M/5%/RoHS/OPEN 0603/12.1K/1%/OPEN 0603/12.1K/1%/OPEN R201 R201 0603/12.1K/1%/OPEN 0603/12.1K/1%/OPEN 0603/10M/5%/RoHS/OPEN 0603/10M/5%/RoHS/OPEN ViewSonic Corporation TURBO 0.47V R134 R134 R140 R140 TURBO AUTO 0603/3.3K/1%/OPEN 0603/3.3K/1%/OPEN 0603/3.3K/1%/OPEN 0603/3.3K/1%/OPEN RIGHT SR1(1.77) SR2(0.93) Model +LEFT +POWER Title...
  • Page 50 TP0610K/PbF OPEN/0603 OPEN/0603 AUDIO_ON 0603/10K/5%/RoHS 0603/10K/5%/RoHS 2N7002/RoHS 2N7002/RoHS 0603/100n/25V/Y/RoHS 0603/100n/25V/Y/RoHS VOL_ADJ 0603/100n/25V/7/RoHS 0603/100n/25V/7/RoHS 2N7002/RoHS 2N7002/RoHS OPEN/0603 OPEN/0603 1206/10u/16V/5/RoHS 1206/10u/16V/5/RoHS 0603/1K/5%/RoHS 0603/1K/5%/RoHS MUTE 0603/0R/5%/RoHS/OPEN 0603/0R/5%/RoHS/OPEN ViewSonic Corporation Model Title INVERTER INTERFACE Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 51 Heat-Sink Vref (POWER FOR SCALER) V33P1 V33P1 FBMJ2125HS420/PbF FBMJ2125HS420/PbF LM1117MPX-3.3/RoHS LM1117MPX-3.3/RoHS V33P VOUT V33P VOUT (Panel VCC) 1206/22u/16V/Y/RoHS 1206/22u/16V/Y/RoHS 0603/100n/25V/7/RoHS 0603/100n/25V/7/RoHS 1206/22u/16V/Y/RoHS 1206/22u/16V/Y/RoHS 0603/100n/25V/7/RoHS 0603/100n/25V/7/RoHS ViewSonic Corporation Model POWER Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 52 BAV70W/RoHS BAV70W/RoHS 0603/100n/25V/7/RoHS 0603/100n/25V/7/RoHS 0603220KV05T/RoHS 0603220KV05T/RoHS C129 C129 R135 R135 0603/10K/5%/RoHS 0603/10K/5%/RoHS 0603/100n/25V/X/RoHS 0603/100n/25V/X/RoHS BZT52-C5V6S/RoHS BZT52-C5V6S/RoHS R136 R136 0603/3.9K/5%/RoHS 0603/3.9K/5%/RoHS VGA_5V VCLK 0603/47K/5%/RoHS 0603/47K/5%/RoHS AT24C02-10TU-1.8/RoHS AT24C02-10TU-1.8/RoHS ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 53 BAV99W/RoHS BAV99W/RoHS BAV99W/RoHS 0603/0R/5% 0603/0R/5% V5A_ESD 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 0603/100n/25V/7 UDZSF-5.6B/RoHS/OPEN UDZSF-5.6B/RoHS/OPEN 1206/10u/16V/5/RoHS 1206/10u/16V/5/RoHS ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 54 LED_OR 2N7002/RoHS/OPEN 2N7002/RoHS/OPEN 0603/100n/25V/Y/RoHS/OPEN 0603/100n/25V/Y/RoHS/OPEN 0603/249R/1%/RoHS 0603/249R/1%/RoHS LED_O V33C V33C 0603/1K/5%/RoHS/OPEN 0603/1K/5%/RoHS/OPEN 0603/10K/5%/RoHS 0603/10K/5%/RoHS 0603/0R/5%/RoHS 0603/0R/5%/RoHS TP0610K/PbF TP0610K/PbF LED_GL 2N7002/RoHS/OPEN 2N7002/RoHS/OPEN 0603/249R/1%/RoHS 0603/249R/1%/RoHS 0603/100n/25V/Y/RoHS/OPEN 0603/100n/25V/Y/RoHS/OPEN ViewSonic Corporation Model LED_G Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 55 V12A GVOFF V12A FSTH BSTH S Board X Board RA N/P --> BA P/N GA N/P --> GA P/N BA N/P --> RA P/N ViewSonic Corporation Model Title PANEL INTERFACE Date Rev: ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...

  • Page 56: Pcb Layout Diagrams

    11. PCB Layout Diagrams ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 57 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 58 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 59 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 60 ViewSonic Corporation Confidential - Do Not Copy VE1920wmb-2...
  • Page 61 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 Confidential - Do Not Copy...

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