ViewSonic VG921m-2 Service Manual
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ViewSonic VG921m-2 Service Manual

ViewSonic VG921m-2 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VG921m-2
Model No. VS11313
19" Color TFT LCD Display
(VG921m-2_SM Rev. 1a Jan. 2007)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VG921m-2

  • Page 1: Service Manual

    Service Manual ViewSonic VG921m-2 Model No. VS11313 19” Color TFT LCD Display (VG921m-2_SM Rev. 1a Jan. 2007) 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 Block Diagram Schematic Diagrams PCB Layout Diagrams 10. Exploded Diagram and Exploded Parts List 11. Recommended Spare Parts List ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 4: Precautions And Safety Notices

    Limited Power Source, or be applied exemption. (14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit. Do not connect the CFL in Hazardous Voltage Circuit. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 5 ”Mura”. the polarizer. 3.Place the monitor on a clean and soft foam pad. 3.Placing the monitor on foreign objects. That could scratch the surface of the panel or cause “Mura”. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 6: Specification

    10% - 90 % (no condensation) UL/CUL, FCC (ICES-003B), CB, CE, TCO'03, GS, ERGO(covers ISO13406-2 & MPRII), IRAM, VCCI, GOST-R, HYGIENIC (20 copies), Energy Star, CCC, BSMI, PSB, C-TICK, SASO, WEEE, Regulation RoHS, Windows Vista Basic ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 7 135 degrees (Typ) / 110 degrees (Min) @ CR>10 Vertical Viewing Angle 160 degrees (Typ) @ CR>5 Response Time On-Off 10%-90% @ Ta=25°C 8ms (Typ) / 12ms (Max) Mercury 3.0 mg per lamp Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 8 *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 50Hz mode might be worse than 60Hz. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 9: Front Panel Function Control Description

    [1] + [▼] Power Lock [1] + [▲] OSD Lock Signal + [1] + [ ] Factory Mode (include burning mode) Remark : All the short cuts function are only available while OSD off ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 10 2. For auto input select function, it shall meet the requirement in Appendix D. 3. The OSD should disappear after 10 sec or by pushing button [1] or [2] Resolution Notice function should be disabled when push button [2] under Resolution Notice OSD ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 11: Viewsonic Corporation

    Resolution Notice Color Temperature 6500K Volume Sharpness 100% Balance OSD H. Position Treble OSD V. Position Bass OSD Time Out 720x400 / 640x400 (@70Hz) 720x400 OSD Background 640x480 / 640x400 640x480 (@60Hz) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 12: Main Menu

    To adjust the Contrast of the video and the backlight currency. REMARK: 1. These functions setting can be recalled to default by [Up] + [Dn]. 2. These functions should be disabled and setting to default in sRGB Mode. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 13 Audio Adjust : To adjust the audio volume and mute. Color Adjust : To select the color temperature sRGB, 9300°K, 7500°K ,6500°K, 5400°K or user color. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 14: Manual Image Adjust

    H./V. Position: To adjust the horizontal and vertical position of the video. Fine Tune: To adjust the delay time of data and clock. Sharpness: To select the picture sharpness of display. REMARK: This function is available under Native Resolution Mode. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 15: Setup Menu

    OSD Timeout: To set the displaying time of OSD ( 5” / 15” / 30” / 60” ). OSD Background: To select video background brightness. Memory Recall: Restore default settings of Clock, H./V. Position, Phase, Contrast, Brightness, Color temperature, OSD position, OSD timeout and Sharpness, Volume. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 16: Circuit Description

    LCD monitors with resolutions up to SXGA. It is configured with an integrated triple-ADC/PLL, a high quality scaling engine, an on-screen display controller, a built-in output clock generator, and LVDS display interface. To further reduce system costs, the TSUM57AK also integrates intelligent power management . ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 17: Adjustment Procedure

    11. 1024 x 768 @ 60Hz, 48.4kHz 12. 1024 x 768 @ 70Hz, 56.5kHz 13. 1024 x 768 @ 75Hz, 60.0kHz 14. 1280 x 1024 @ 60Hz, 64.0kHz 15. 1280 x 1024 @ 75Hz, 80.0kHz ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 18 The screen must have the pure Figure 9 Pattern white and black pattern, no other color. Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2) Horizontal & Vertical Thickness Pattern R. Color Pattern (Figure 4) (Figure 3) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 19 G. Color Pattern (Figure5) B. Color Pattern (Figure 6) Full White Patter (Figure 7) Dark Screen Pattern (Figure 8) Black-White Pattern (Figure 9) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 20 (a) Select and enter “Manual Image Adjust” function on OSD Main Menu. (b) Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to adjust the video boundary to be full scanned and within screen frame. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 21 1.5.13 Check for Secondary Display Modes Test Signal : Analog 640*350@70Hz 640*480@60HZ / 75HZ 720*400@70Hz 800*600@60HZ / 75HZ 832*624@75Hz 1024*768@60HZ / 75HZ 1280x1024@75Hz - Normally when the primary mode 1280x1024@60Hz is well adjusted and compliant ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 22 - Fixture for Firmware Upgrade - VGA Cable - PC (Personal Computer) - ISP Tool - Firmware Upgrade Program - One additional monitor for checking the program execution ISP tool instruction 15 pin D-Sub LPT cable ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 23 ISP tool Use 12V adapter ISP connect method ISP Download program procedure Hardware Connect status: Version update 1. Check : Monitor model 2. Check : Firmware version ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 24 AR : Analog /RSDS DR : Analog + Digital / RSDS Panel type : 150MX17A01 Firmware version : R30.2 Change Panel (Version update) 1. Check : Monitor model 2. Check : Firmware version ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 25 DR : Analog + Digital / RSDS Panel type : 150MX17A01 Firmware version : R30.2 (ps.2) If change panel : (Form HSD150MX17A00 change to HSD150MX17A01) Panel type : 150MX17A00 => 150MX17A01 Firmware change : HC154_AL_150MX17A00R30.2 => ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 26 Panel type : 150MX17A01 Firmware version : R30.2 3. Change scaler board. 4. Update final firmware version : HC154_AL_150MX17A01R30.3 5. Update EDID code : HC154_150MX17A01_EDID_A.txt Mstar scaler ISP function 1. Enforce Mstar ISP_Tool program. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 27 3. Enforce Mstar ISP Utility Window's Connect function, and Device Type's Dialog window will be opened ,then press "Sure " on Dialog window. 4. Enforce Mstar ISP Utility window’s Read function. 5. Choose the path and the file of Binary code. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 28 6. Choose the path and file of Binary code ,and Program Bin Ready Dialog window will be opened, then press "Sure" on Dialog window. 7. Enforce Mstar ISP "Auto" function of Utility window. 8. Enforce Mstar ISP Utility window "Run" and write in the data . ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 29 9. After writing in the data , Enforce Dis Connect function of Mstar ISP Utility window and the burn in procedure will be completed. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 30 DDC Card (D8330) RS-232 Cable VGA Cable Step 1 : Select VG921m in Working Model column to show EDID data on left. Example : VX1935wm ( VG921m follows the same setting procedure ) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 31 Step 2 : Modify the column of Week of Manufacture and Year of Manufacture and ID serial Number then press “2B” button for changing serial number data. Example : VX1935wm ( VG921m follows the same setting procedure ) Step 3 : You will see the result as follows. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 32 (Figure 5 ~ 6) User’s manual / Warranty card/ Base short side turn upward CD package Power Cord / D-Sub Cable Panel side forward Audio Cable (Figure 5) (Figure 6) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 33 3. Unfasten 4 pcs of screws to remove 4. Unfasten 4 pcs of screws with back base. cover. 5. Separate the Cover from the bottom of the Housing by using a Flat tool to remove back cover. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 34 8. Unfasten 2 pcs of screws to remove 9. Tear off the tape. left speaker. 10. Unfasten 2 pcs of screws to remove 11. Pull and open the fixed support to key board. remove Front Bezel. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 35 14. Unfasten 5 pcs of screws with 15. Disconnect the cables of P/I board. Shielding. 16. Disconnect the cables of D-Sub. 17. Unfasten 8 pcs of screws to remove P/I/A board. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 36 18. Disconnect the cables of P/I/A 19. Set the short pin before changing board. new P/I/A board. 20. Unfasten 5 pcs of screws to remove 21. Disconnect the cables of D-Sub D-Sub board. board. ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 37: Troubleshooting Flow Chart

    Please reconnect signal cable Display panel have horizontal Please change panel line or vertical line Please check inverter The backlight is OFF wire if properly connected Please change panel or P/I/A board (ps) ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 38 Please check if panel wire is loose connection or not Please change panel Audio output error Please change P/I/A board (ps) (ps) : P/I/A board Power/Inverter/Audio board ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 39: Block Diagram

    SCALAR BL-BRIGHT U401 DC-DC TSUM57AK U301 G1117-33 1.8V AUDIO OSC 12M INPUT CN501 EEPROM AT24C16N-10SC-2. Flash U402 SST25VH010 H、SYNC R、G、 V、SYNC BINPUT AT24C02 H、V SYNC VGA D-SUB SCL、SDA VGA 5V CONN CN4 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 40: Schematic Diagrams

    VGL: -6V U202 C226 0Ω 1/16W C208 R207 C225 C205 C221 220p/NC C202 0.1uF/16V 0.1u/NC S-80924LMC-G6U-T2G/NC 1KΩ 1/16W 10u/NC 0.47uF/25V D201 BAT54SPT D214 6.2V D208 CHPT521S-30 ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 41 C427 C428 C429 C430 C431 C432 C433 C434 C435 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 1206 ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 42 X_IC X_IC VGMA[0..13] L502 VDD+12 L503 B0603/0 B0603/0 VDDB2 VDDA2 C536 C530 C532 C534 C529 C531 C533 C535 ViewSonic Corporation 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 43 TP169 TP170 TP171 MODE MODE R501 R525 R502 1KΩ 1/16W 1KΩ 1/16W ViewSonic Corporation Model Charge sharing setting(Low : Enable) Data pol (Low : Disable) Title Date Rev: Low Power Control(Hi : Enable) ViewSonic Corporation Confidential - Do Not Copy...
  • Page 44 4.7KΩ 1/16W PWR_EN PMBS3904 R542 R543 4.7KΩ 1/16W BL_ADJ 4.7KΩ 1/16W 0.1uF/16V STBY R544 4.7KΩ 1/16W C165 R174 0.1uF/16V BL_BRIGHT PMBS3904 10KΩ 1/16W AMP_STBY 0.1uF/16V 1uF/16V 10uF/16V ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 45 C149 1KΩ 1/16W VGA_HS 0.1uF/16V 120ohm R178 R179 R184 1KΩ 1/16W VGA_VS AT24C02 4.7KΩ 1/16W 33pF 220pF R180 100Ω 1/16W DDC_SCL SCLK R181 100Ω 1/16W ViewSonic Corporation DDC_SDA Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 46 TP80 TP77 TP85 DDCROM_SCL DDCROM_SDA R534 R535 220KΩ 1/16W VOLUME 0.1uF/16V 15KΩ 1/16W R536 4.7KΩ 1/16W C160 PMBS3904 AMP_MUTE AMP_STBY 0.1uF/16V 100Ω 1/16W 100Ω 1/16W ViewSonic Corporation AT24C16N-10SC-2.7 Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 47 ON/OFF IC_VCC IC_VCC CN1B DBRT ENSYNC CN1A ABRT OUTL DBRT VCCL CN2A OUTR COMP CN2B VCCR JP10 IC_VCC ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 48 R124 R240A Ilimit Drain R241 R235 C243 C242 R240B D120 L120 C240 9.10 R230 R234 PC201B PC201A ZD121 C120 R231 C231 R232 C232 IC230 R233 CY103 ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 49 C510 STBY VAROUT_R R504 R505 C511 C512 VAROUT_L MUTE R506 R507 C503 R508 R509 AUDIO_STBY AUDIO_STBY AUDIO_MUTE AUDIO_MUTE R503 R510 R512 R511 Q501 C506 Volume Volome ViewSonic Corporation Model Title Date Rev: ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 50: Pcb Layout Diagrams

    9. PCB Layout Diagrams ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 51 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 52 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 53 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 54 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 55 ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 56 SILKSCREEN-TOP ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 57 TOP SIDE ViewSonic Corporation Confidential - Do Not Copy VG921m-2...

  • Page 58: Exploded Diagram And Exploded Parts List

    10. Exploded Diagram and Exploded Parts List ViewSonic Corporation Confidential - Do Not Copy VG921m-2...
  • Page 59 EXPLODED PARTS LIST ( VG921m-2 ) ViewSonic Model Number: VS11313 Rev: 1a Serial No. Prefix: QB8 Item ViewSonic P/N Ref. P/N Description Q'ty E-00008261 30-V9211R53G001 VG921 SPEAKER 1.5W/8R 100mm 41-03010037G000 HX191 WALL MOUNT BRACKET TAIWAN 190SEN1-A04 LIQUID CRYSTAL DEVICE HSD190SEN1-A...
  • Page 60 PACKING PART LIST ( VG921m-2 ) ViewSonic Model Number: VS11313 Rev: 1a Item ViewSonic P/N Ref. P/N Location Q'ty 61-01000003G000 U171 pe bag 225 * 400 mm P-00008257 61-01000028G000 VG921 end cap-L EPS CB-00008097 33-R3910501G000 Cable signal D/15p(M) 1800mm-JHEN P-00008258...

  • Page 61: 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 ViewSonic Corporation...
  • Page 62 Serial No. Prefix: QB8 Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty 04-1VG92100G000 EDID VG921m-2 190ME13 EDID A 06-VG322100G000 Bin Code VG921m-2 AR HSD190ME13 A11R30.0 TAIWAN 190SEN1-A04 LIQUID CRYSTAL DEVICE HSD190SEN1-A E-00008261 30-V9211R53G001 VG921 SPEAKER 1.5W/8R 100mm 33-00000004G000...
  • Page 63 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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