ViewSonic VG921m-4 VS11369 Service Manual
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ViewSonic VG921m-4 VS11369 Service Manual

ViewSonic VG921m-4 VS11369 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VG921m-4
Model No. VS11369
19" Color TFT LCD Display
(VG921m-4_SM Rev. 1a Nov. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VG921m-4 VS11369

  • Page 1: Service Manual

    Service Manual ViewSonic VG921m-4 Model No. VS11369 19” Color TFT LCD Display (VG921m-4_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 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 4: Precautions And Safety Notices

    In case parts need to be replaced, you must use identical parts or those supplied by our certified manufacturers. Any other parts used without our authorization may result in electrical shock or fire risk. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 5 Take out the monitor with cushions May cause”mura” Placing the monitor on a foreign objects, that could Place the monitor on a clean and soft foam pad scratch The surface of the "Panel" or cause "mura" VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 6 The panel is placed facedown the lap,that may cause "mura" VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 7: Specification

    1280 x 768 @ 60, 75Hz 1280 x 960 @ 60, 75Hz 1280 x 1024 @ 60, 75Hz AUDIO Speaker 1.5W x2 CONNECTORS Video Analog DB-15 Internal Power Adapter, 3-pin plug (CEE22) VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 8 (W x H x D) Stand 16.75" (W) x 18" (H) x 8.1" (D) Wall Mount 425.4 mm (W) x 397 mm (H) x 66 mm (D) 16.75" (W) x 15.6" (H) x 2.6" (D) VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 9 Package LCD Display Contents Power CableVideo Cable Audio Cable Quick Start Guide ViewSonic Wizard CD-ROM Packaging Carton -- One piece construction with signal wall, 0.65 Kg Information Plastic Handle -- PE-LD, 12g Poly Foam -- EPS, 207g, 2 pices Accessory Plastic Bags -- PE-LD, 2g The PE bag that cover monitor -- PE-LD, 18g Pallet (M Model ) -- Fumigation wood, 22.5Kg...
  • Page 10 MIC Cable(1.8m, black) with PC 2001 USB Cable (V2.0) Arabic, English, Finnish, Spanish, German, ViewSonic CD Wizard Italian, Japanese, Swedish, Polish, Korean, Portuguese, Russian, Turkish , French, Czech, ViewSonic Quick Start Guide Hungarian, Simplified Chinese, Traditional Chinese PerfectSuite CD Screen Protector Mylar Foot Protector plastic...
  • Page 11 Shall be compatible with all PC type computers, Video Compatibility Macintosh computers, and after market video cards Resolution Compatibility Refer to Segment 4-5 Exclusions Not compatible with interlaced video 4-3 USB INTERFACE No USB interface VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 12 Black Power Saving Operation(Method) VESA DPMS Signaling On Mode <36 W (max) Power Consumption Saving Mode< 1W Off Mode <1 W Recovery Time On Mode = N/A, Active Off < 3 sec VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 13 1280 x 720 @ 60 Hz, 45 KHz 1280 x 768 @ 50 Hz, 39.6 KHz 1280 x 768 @ 60 Hz, 47.8 KHz DMT; 1280 x 768 @ 75 Hz, 60.3 KHz DMT; VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 14 ● 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 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 15 OSD Lock No signal + [2] + [ ] Burning mode Signal + [2] + [ ] Factory Mode Remark : All the short cuts function are only available while OSD off VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 16: Function Descriptions

    1. The Input Signal Notice OSD appears 3 seconds when power turns on or change input signal. 2. The Input Signal Notice OSD position is on the right-bottom side of image. And the OSD background shall be transparent. (OSD Background = off). VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 17 Cable type / length 3.5mm stereo cable / 1.8m length Speakers should be off when the rest of the monitor is in Audio DPMS power saving. * No any sympathetic or abnormal noise allowed. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 18 8ms (Typ) / 16ms (Max) Mercury 3.0 mg per lamp Panel Defects Please see Panel Quality Specifications. *Over 50% units of shipment shall be equal or better than the Typical value above. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 19: Display Size

    Brightness / Contrast = Default (5400K) (Def) CCT = 5400K –Condition: (Brightness) x 100% ≤ 55% / Lv (Brightness=0%) (Brightness=100%) Contrast = 100% –Condition: (Contrast) x 100% ≤ 30% / Lv (Contrast=0%) (Contrast=100%) Brightness = 100% VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 20 Δu’v’<0.01 (@ Full White pattern) Preset Color Temperature Each color preset shall be adjustable. Red, Green, Adjustability and Blue shall be individually controlled. * Any gray level and Contrast/Brightness should not get reddish, greenish or bluish. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 21: 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 a shortcut to Auto Image Adjust. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 22 • 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.) VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 23: Main Menu Controls

    6500K-Adds red to the screen image for warmer white and richer red. 5400K-Adds green to the screen image for a darker color. 5000K-Adds blue and green to the screen image for a darker color. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 24 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 25 Resolution Notice allows the user to enable or disable this notice. If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1280 x 1024, the following screen appears. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 26 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. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 27: Circuit Description

    ADC ground ADC_REFIO ADC band-gap voltage de-coupling 1.20V ADC_VDD Analog power (3.3V) BLUE+ Analog input from BLUE channel BLUE- Analog input ground from BLUE channel ADC_GND ADC ground SOG/ADC_TEST SOG in/ADC test pin VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 28 (1), (2), (3), / 2mA TCON [2] PWM2 SCLK Serial control I/F clock (2), (3), (5) SCSB Serial control I/F chip select (2), (3), (5) RESET RESET output for Micron (2), (5), (6) / 2mA VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 29 BR1P BR1P TOAP BRED [3]/T12 BRED [3] BR1N BR1N TOAP BRED [2]/T13 BRED [2] AB3P TEDP ABLU [7]/T14 ABLU [7] AB3N TEDN ABLU [6]/T15 ABLU [6] AB2P TECLKP ABLU [5]/T16 ABLU [5] VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 30 (1), (7), (8) V[6] TCON [1] / V [7] V [7] DENA DENA (1), (7), (8) V[7] TCON [0] / VCLK VCLK DCLK / TCLK DCLK / TCLK (1), (7), (8) VCLK VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 31 Video8 even-odd signal DDC Channel: 4 pins Name Pin No Description Note DDCSCL / TCON [0] / BBLU DDC serial control I/F clock / TCON (2), (3), (5) [0] / TTL BBLU [1] VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 32 • Maximum 6 channels of PWM DAC • Compliant with VESA DDC1/2B/2Bi/2B+ standard • Dual slave IIC addresses; two H/W auto transfer DDC1/DDC2x data for both D-sub and DVI interfaces • Watchdog timer with programmable interval VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 33 There are two signals which control the inverter come from system to turn on the inverter and control brightness. Logic “low” level which send to U901 is turn on the inverter. BL-ADJ signal control brightness by DC level which was integral from PWM signal. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 34: Adjustment Procedure

    *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. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 35 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 36 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 37 DYNACOLOR DDC Tester System software Barcode Scanner *1 AC POWER Source One additional monitor for Test System displaying DDC RS232 D8330 DDC CORD Barcode Scanner Monitor_VG921M RS232-VGA Cable AC POWER Cable RS232-DVI Cable DDC TESTER SOFT VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 38 NOTE: Before install DDC Tester System soft, please check that the D8330 CORD is plugged. Or the DDC Tester application couldn’t be run. 1.3.1 Install DDC Tester System by selecting and checking” setup.exe” icon. Press “YES” or “NEXT” Buttons until the installation is completed. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 39 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 40 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 41 VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 42 1.4.0 DDC Key In Procedure Step 1 select and execute DDC Key In program (winDDC.exe icon on desktop) VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 43 Step 2 Load DDC source file Step2.1 Choose “File “menu, click “Model Edit “button into ” model edit “ dialog VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 44 Step2.2 Press “Brower” button set current DDC_LOAD_FILE working path VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 45 “working Model”, select Model in list box Step3 Double click the “input barcode” icon at the toolbar, Key in the serial number or Use Barcode Scanner to scan the barcode of the monitor. And press the “enter” key. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 46 Step5.2 open up the “my computer” attribute dialog box, select the “hardware” option, open “drive management”. Below the monitor catalog, uninstall the monitor. Step4.1 Scan the hardware change, until system find the new monitor driver VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 47 Step4.2Select and click the “EDIDW2K.EXE “file, the EDID information will show on the screen VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 48 Setp4.3 Check the DDC VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 49 Packing For Shipping and Disassembly Procedure 1. Take off the cover of the Bracket 2. Pull the four screws which can fix up the Bracket VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 50 3.Take off the three screws from the housing 4. Remove the housing VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 51 6.Pull off the cables which can fix up the speakers and then pull out the speaker cables 7. tear off the AL foil from the key board and then pull out the cables VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 52 8. Take out the screws from the key board 9.take off the AL foil (4pcs)from the lamp cable 10. Unscrew 3 pcs screws from the shield cover. VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 53 11 Take out the AL foil which connecter the power board and main board 11. Tear off the aluminum foil from the FFC cable 11. Take off the FCC Cable VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 54 12 Take out the power board connector and lamp wire 13. Unscrew screws from the power board and take off Power board VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 55 14. Unscrew screws from the main board and take off the screws 15. Unscrew the six corner screws(4pcs)and then take off the main board VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 56 16. Take off the bezel VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 57 17. Unscrew the screws(4pcs) from the frame and then take off the frame VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 58: Troubleshooting Flow Chart

    6. Troubleshooting Flow Chart Main Procedure Start Connect all of devices to the LCD monitor Power On A. Power Circuit Is indicator LED Troubleshooting light? VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 59 B. Backlight Is backlight on? Troubleshooting C. Performance Display Performance Troubleshooting O.K.? D. Function Function Adjustment Troubleshooting O.K.? E. Audio Audio Function O.K.? Troubleshooting No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 60 A. Power Circuit Troubleshooting Start Change AC/ DC Adapter Retry Power Change Main Board & Retry No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 61 B. Backlight Troubleshooting Start Change Inverter and Retry Change Main Board& Retry Backlight Change Module No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 62 Board Screen is Change Change Main Change LCD flickering? Inverter Board Board Module Change LCD LCD Line Defect? Module Change LCD Bad Uniformity? Module Check Change Main Is screen white? Connector Board VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 63 Screen with noise or line Prss Reset Button from bar? front panel control Change Main Board Make sure relution is set Screen is smaller? at default Reset O.K.? Change Main Board No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 64 D. Function Troubleshooting Start Change Control Menu not Control Board Functioning? and Retry? Change Main Board No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 65 E. Audio Troubleshooting Start Make sure sound output, Audio cable is OK. Change No Sound Speaker Change Sound is broken? Speaker Volume Change Main Unadjustable? Board No Trouble Found VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 66: 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 67 REV:0 F001217043001 USER'S GUIDE LM/LM1704 ENGLISH L210*W148mm for Viewsonic REV:0 F101415170401 MARK LM/LM1704 L11*W11mm energy star F10250619VA04 Safety Label LM/MR19V-ABAD L149.5*W29.5mm for viewsonic VG921m HSD A16 DC-00008146 F103015170401 Blank Label LM/LM1704 L50*W25mm DC-00008065 F103015171A01 Blank Label LM/MR17I-AAA L36*W9mm for viewsonic china...
  • Page 68 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty M155223008401 SCREW STD 十/ P HEAD Φ3.0* L8mm NICKEL M155223010401 SCREW STD 十/ P HEAD Φ3.0*L10mm NICKEL M701900LM0200-E Hinge SPCC LAUNDER LM/MR19V-ABAD REV:0 BUCKLE(UP) ABS HB L45*W10*H25mm BLACK FOR LM/MR19V-ABAD(FOR...

  • Page 69: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List EXPLODED PARTS LIST (VG921m-4) ViewSonic Model Number: VS11369 Rev: 1a Serial No. Prefix: QB9 Item ViewSonic P/N Ref. P/N Description Q'ty P727A995LM010-H BEZEL ABS HB BLACKLM/MR19V-ABAD REV:0 P791P500LM060-A LENS PMMA TRANSPARENT TEXTURIZED P761A998LM010-B...
  • Page 70 VGA CABLE 30AWG UL20276 L1800mm 15PIN BLACK A-00006505 W402221509531 AC POWER CORD USA Spec. 22AWG L150cm BLACK F801190000035 CD Plate F000419VAK001 Quick Install Manual LM/MR19V-ABA L190*W127mm for viewsonic VG921m REV:0 Monitor Head Only F300250000047 BAG /PE L550*W480*T0.03mm C-00008184 XLM19VA280001 BASE ASSY LM/MR19V-ABA BLACK...

  • Page 71: Block Diagram

    9. Block Diagram Backlight VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 72: Schematic Diagrams

    BKLT-VBRI MCU_VCC R126 1K VBRI KST3904 DGND LED2 2N3906 LED-2 2N3906 5DVCC LED1 LED-1 4.7K R15 NC BKLT-EN R127 1K INVON 100nF 47uF_16V/NC ViewSonic Corporation 10K/NC KST3904 Model DGND Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 73 MENU MUTE EXIT DOWN DOWN EXIT MUTE MENU DGND POWER LED-2 HEADER 13/SM HEADER 13/SM LED-1 HEADER 13/SM LED1 ViewSonic Corporation Model Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 74 RA6 10K LIN- CA16 FBA5 BED/6 NC/0.1uF PHONEJACK 5P APA2065 CA10 NC/180PF FBA4 NC/180PF BED/6 NC/1R2 AGND AGND AGND AGND AGND FBA10 BED/6 CA12 2.2uF_16V AGND ViewSonic Corporation Model Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 75 R148 100 DDC1_SDA HDA1/TX/P3.1 P6.0/AD0 R149 100 DDC1_SCL HCL1/RX/P3.0 MTV512 24MHz 472_4 R151 R150 R152 6.8K 472_4 MCU_VCC C125 C126 10pF 10pF 5DVCC Closed to MCU MCU_VCC ViewSonic Corporation Model Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 76 BG2N / TXE3- RXE3+ ADC_VDD BG2P / TXE3+ AHS0 RTD_SCLK AHS0 R1.8DVCC AHS1 / V0 VOUT AVS0 AVS0 AVS1 / VCLK 1117-1.8V 100nF 100uF_16V DDC1_SCL DDCSCL1 DDC1_SDA DDCSDA1 ViewSonic Corporation Model Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 77 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 BAV99 C114 C113 C115 C116 C117 C118 C119 C120 100nF 100nF 100nF 3.3DVCC 100nF 100nF 100nF 100nF 100nF DGND ViewSonic Corporation Model Title Date Rev: VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 78: Pcb Layout Diagrams

    11. PCB Layout Diagrams VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...
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  • Page 85: Viewsonic Corporation

    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) VG921m-4 ViewSonic Corporation Confidential - Do Not Copy...

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