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ViewSonic VG910S - 19" LCD Monitor Service Manual

19" color tft lcd display
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Service Manual

ViewSonic VG910s/b-1
Model No. VLCDS27944-3W/-4W
19" Color TFT LCD Display
(VG910s/b_SM_721 Rev. 1a Mar. 2004)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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Summary of Contents for ViewSonic VG910S - 19" LCD Monitor

  • Page 1: Service Manual

    Service Manual ViewSonic VG910s/b-1 Model No. VLCDS27944-3W/-4W 19” Color TFT LCD Display (VG910s/b_SM_721 Rev. 1a Mar. 2004) 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

    4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 4: Precautions And Safety Notices

    The openings should never be blocked by placing the product on a bed, sofa, rug, or other similar surface. This product should never be placed near or over a radiator or heat register. This product should not be placed in a built-in installation unless proper ventilation is provided. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 5: Specification

    20 to 85% Storage Temperature -20 to 60°C Storage Humidity 5 to 85% (non-condensation) Accessories AC cable 1.8m User Guide English CD Rom Warranty Card HD15 - HD15 cable DVI(D) - DVI(D) cable Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 6 Pulses Pulses Active <60W Green Pulse No Pulse Active off Blank <1W Amber No Pulse Pulse No Pulses No Pulses <30KHz , <50Hz , <60W Out off scan range Green >82KHz >85Hz Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 7 2.3.3.4.2 ADJUST R, G, B SUB-CONTRAST TO MEET FOLLOWING CHROMATICITY SPEC. 5000¢ X K ¡ ÷ x = 0.346 ¡ Ó 0.003, y = 0.359 ¡ Ó 0.003 , Y > 180cd/m Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 8 0.329 ¡ Ó 0.010 OVER190 cd/m 5400¢ X K 0.335 ¡ Ó 0.010 0.350 ¡ Ó 0.010 OVER cd/m 5000¢ X K 0.346 ¡ Ó 0.010 0.359 ¡ Ó 0.010 OVER cd/m Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 9 Burn in on ¡ ³ ¡ ³ ¡ ³ All mode recall Lock(Unlock) ¡ ³ ¡ ³ Power Key Lock(Unlock) ¡ ³ ¡ ³ Osd Key ¡ ³ ¡ ³ ¡ ³ Read EDID Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 10 EDID SERIAL NO. FORMAT 2.5.1 EDID for VG910s 2.5.1.1 Analog EDID 128 BYTES OF EDID CODE: 2.5.1.2 Digital EDID 128 BYTES OF EDID CODE: Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 11 2.5.2 EDID for VG910b 2.5.2.1 Analog EDID 128 BYTES OF EDID CODE: 2.5.2.2 Digital EDID 128 BYTES OF EDID CODE: Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 12 H- front porch V-sync V-back porch Count num (V-total) V-front porch H-sync. Polarity Negative Positive Positive Positive Positive Negative Negative V-sync Polarity Negative Positive Positive Positive Positive Negative Negative H-resolution (dots) 1024 V-resolution (lines) Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 13 1024 Notes: Because this model no support FRC and in order to meet the panel spec of vertical frequency, some timing can not full screen in vertical size. Ex:640x400/70Hz;640x350/70Hz ;720x400/70Hz ;640x480/85Hz;800x600/85Hz; 1024x768/85Hz. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 14 V-sync V-back porch Count num (V-total) V-front porch H-sync. Polarity Negative Positive Positive Positive Positive Negative Negative V-sync Polarity Negative Positive Positive Positive Positive Negative Negative H-resolution (dots) 1024 1024 V-resolution (lines) Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 15 1024 Notes: Because this model no support FRC and in order to meet the panel spec of vertical frequency, some timing can not full screen in vertical size. Ex:640x400/70Hz;640x350/70Hz ;720x400/70Hz ;640x480/85Hz;800x600/85Hz; 1024x768/85Hz. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 16: Front Panel Function Control Description

    Also a shortcut to toggle between analog and digital connections. Power light Green = ON Orange = Power Saving Audio Mute button turns the sound off. Power On/Off Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 17 • 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.) Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 18 Balance speaker. adjusts the low (bass) frequency audio output. Bass adjusts the high (treble) frequency audio output. Treble temporarily silences audio output. Mute Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 19 ▼ To adjust selected color, press Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 20 Horizontal Size sharpens focus by aligning the illuminated text and/ Fine Tune or graphic characters. adjusts the clarity and focus of the screen image. Sharpness Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 21 Memory Recall settings if the display is operating in a factory Preset Timing Mode listed in this user guide. Exception: This control does not affect changes made with the User Color control. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 22: Circuit Description

    Pins 1 and 9 are right and left channel inputs respectively. Pins 4 and 6 are right and left channel outputs which connect to two 4OHM speakers. Pin 8 is the mute/stand-by. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 23: Adjusting Procedure

    8.3 Interference of EMI: The inspection shall be carried out in the place where a set is not disturbed by external unnecessary electric wave and magnetic field. 8.4 Temperature: 24 ± 2 8.5 Humidity: 65 ± 20%. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 24 "RGB Reset" function Input 1280x1024 / 60Hz Full white pattern Push "1 + DC power" 3 second Select "Color Adjust" to adjust "9300K" , "6500K" "5400K" , "5000K" Push Exit adjust OSD Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 25 5.2.1.6.3 Input 1280x1024 / 60Hz & 16 grays pattern at 100IRE, adjust brightness 100%, and contrast 100%. 5.2.1.6.4 9300K / 6500K / 5400K / 5000K, the 16 grays only had 4 grays can saturation. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 26: Trouble Shooting Flow Chart

    2. Disconnected between CN251 and power board. Failure point FB251, FB251, F251 failure Check that C255 positive is at 5V. Failure point P251, IC251, L251 failure Check: 1. C262 is O/P 2.5V. 2. IC253 is O/P 3.3V. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 27 Check that C255 positive is at 5V CN251 is approximately 12V Power board failure Check CN302 pin8 is IC251 failure 12V, pin3 is 5V 1. Check Q309, Q310 pin. Inverter failure 2. Check FB315, FB316 Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 28 Check CN302 pin8 is 12V, 1. D252, D253 failure. pin3 is 5V 2. IC253 failure. Check C255 is O/P 5V. 1. Check Q309, Q310. Inverter failure 2. Check FB315, FB316 IC251. D251 failure Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 29 Check the the cable is fully conneted between the interface board and key board Failure point Failure point 1. D305, D306 ~ D311, D312 failure. The cable is disconnected. 2. TACT switch failure. Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 30 Figure of Waveform Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 31 Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 32: Recommended Spare Parts List

    BY AIR SHIPPING,STICK ON TUBE, 0.125 M-MS-0808-9126 3200655300 NAME PLATE VSC 3-BIRD LOGO AL 14.5*10.0 FOR F/B ,REV:00 M-MS-0808-9127 3200655500 NAME PLATE AL VIEWSONIC L38 T1.2 FOR F/B ,REV:00 M-LB-0813-0384 3200712700 LABEL CONTROL 100*90 Stick on pallet 0.063 M-LB-0813-0551 3200744000...
  • Page 33 VG910b Recommended Spare Parts List Item ViewSonic P/N Ref. P/N Description Location Q'ty M-MS-0808-8563 3460146300 BRACKET KEYLOCK SECC 20.4*16.45*4.9 T.6 CABINET BACK M-BK-0805-0048 3460165200 BRACKET D-SUB SECC 266*30*29 T.8 M-BK-0805-0049 3460165300 BRACKET HINGE SECC 228*60*16 T.8 M-BK-0805-0050 3460165401 BRACKET PANEL SECC 406.3*332.3*19.8 T.8...
  • Page 34 BY AIR SHIPPING,STICK ON TUBE, 0.125 M-MS-0808-9126 3200655300 NAME PLATE VSC 3-BIRD LOGO AL 14.5*10.0 FOR F/B ,REV:00 M-MS-0808-9127 3200655500 NAME PLATE AL VIEWSONIC L38 T1.2 FOR F/B ,REV:00 M-LB-0813-0384 3200712700 LABEL CONTROL 100*90 Stick on pallet 0.063 M-LB-0813-0551 3200744000...
  • Page 35 VG910s Recommended Spare Parts List Item ViewSonic P/N Ref. P/N Description Location Q'ty M-MS-0808-9131 3461752800 HINGE-L SUS304 62*20 T2 M-BK-0805-0043 3461753201 BRACKET ARM SECC 156*126.1*153.6 T2 M-BK-0805-0044 3461753301 BRACKET BASE SECC 266.6*161.4 T2 P-FM-0602-0851 3500117000 END BLOCK-TOP L19BMR05AAB 3500117100 END BLOCK-BOTTOM L19BMR05AAB...
  • Page 36 BY AIR SHIPPING,STICK ON TUBE 0.125 M-MS-0808-9126 3200655300 NAME PLATE VSC 3-BIRD LOGO AL 14.5*10.0 FOR F/B ,REV:00 M-MS-0808-9127 3200655500 NAME PLATE AL VIEWSONIC L38 T1.2 FOR F/B ,REV:00 M-LB-0813-0384 3200712700 LABEL CONTROL 100*90 Stick on pallet 0.063 M-LB-0813-0551 3200744000...
  • Page 37 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 3368992301 STAND ASSY L18FMW05ABB S8LBA1AT SERVICE M-SCW-0814-0692 3105124000 SCREW M M4*0.7*6 PAN C S18C NI HINGE R&L+BKT ARM M-SCW-0824-6793 3105125300 SCREW M M4*0.7*6 FF C S18C ZN BLK NYLCOK...
  • Page 38 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 2970040301 PWB S0 CEM-1 175*43 (INVERTER BD) B-PS-0204-0059 5600110175 LCD POWER BD ASSY L19BMR 05AAB #N/A 2970040002 PWB S0 CEM-1 125*60 (PWR BD) M-SCW-0824-0778 3105229400 SCREW M M3*0.5*10 FF C S18C ZN...
  • Page 39 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty E-C-0404-4875 1511545000 CAP MC CP 50V 1KP J C0G 0603 C602,C818 E-C-0404-4875 1511545000 CAP MC CP 50V 1KP J C0G 0603 C819 C301,C302,C303,C304,C305,C306,C3 E-C-0404-4870 1512454000 CAP MC CP 50V .01U K X7R 0603...
  • Page 40 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty J1,J11,J12,J16,J2,J20,J24,J3,J4,R32,R3 #N/A 313000000 RES CH 1/4W ZERO J 1206 3,R34 #N/A 313104000 RES CH 1/4W 100K J 1206 #N/A 313154000 RES CH 1/4W 150K J 1206 #N/A 313331000 RES CH 1/4W 330 J 1206...
  • Page 41 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 313000000 RES CH 1/4W ZERO J 1206 J2,R109,R116,R219,R115 #N/A 313101000 RES CH 1/4W 100 J 1206 R201,R202 #N/A 313125000 RES CH 1/4W 1.2M J 1206 R111,R113 #N/A 313471000...
  • Page 42 VG910b BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 3071297834 HEADER NYLON66 94V-0 12P P2.0 CN901 M-WR-0828-0224 3411000300 JUMP WIRE COPPER 0.6*7.5*4.0 J1~J8 #N/A 3470500600 LED HOLDER NY66 94V-2 OD=8*4 D901 #N/A 3642321800 WIRE WITH TERMINAL 1015 #18 BLK L155...
  • Page 43 BY AIR SHIPPING,STICK ON TUBE 0.125 M-MS-0808-9126 3200655300 NAME PLATE VSC 3-BIRD LOGO AL 14.5*10.0 FOR F/B ,REV:00 M-MS-0808-9127 3200655500 NAME PLATE AL VIEWSONIC L38 T1.2 FOR F/B ,REV:00 M-LB-0813-0384 3200712700 LABEL CONTROL 100*90 Stick on pallet 0.063 M-LB-0813-0551 3200744000...
  • Page 44 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty C-FP-0301-0961 3361085901 F/B ABS SILVER VG910S S9LFC1LS 3361086200TL C-BS-0303-0511 3368991901 STAND ASSY L18FMR05AAB S8LBA1AT SERVICE M-SCW-0814-0692 3105124000 SCREW M M4*0.7*6 PAN C S18C NI HINGE R&L+BKT ARM M-SCW-0824-6793 3105125300 SCREW M M4*0.7*6 FF C S18C ZN BLK NYLCOK...
  • Page 45 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty M-MS-0808-9141 3240296500 THERMAL PAD SILICONE 20*14 T2 STICK ON IC401 #N/A 3670706002 WIRE WITH HOUSING 1007 #26 L120 7P CN302,I/V TO I/F B-SB-0221-0590 5600110128 LCD INVERTER BD ASSY L19BMR 05AAB...
  • Page 46 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty E-C-0404-4878 1511514000 CAP MC CP 50V 22P J C0G 0603 C321,C322,C403,C404 #N/A 1511518000 CAP MC CP 50V 33P J C0G 0603 C613 E-C-0404-4874 1511530000 CAP MC CP 50V 100P J C0G 0603...
  • Page 47 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty FB302,FB303,FB304,FB305,FB306,F B307,FB308,FB309,FB310,FB251,FB 252,FB254,FB311,FB312,FB313,FB31 #N/A 2921093612 BEAD CH 100MHZ 120 OHM 0.2A 0603 4,FB316,FB401,FB402,FB403,FB404, FB405,FB406,FB801,FB802,FB803,F B804,FB806 E-R-0405-2330 13153000 RES CF 1/4W 15K J E-R-0405-5916 23221000 RES CF 1/2W 220 J...
  • Page 48 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty E-Q-0402-1553 242522500017 FET 60V 0.115A 5OHM LL SOT-23 Q03,Q04,Q05 #N/A 242601000217 FET 30V 7A 0.028OHM LL SO-8 N+P IC02,IC03,IC04,IC05 #N/A 2510301254 IC PWM CCFL INVERTER CONTROLLER SOP-20P IC01 #N/A 2811980980 X'FMR IT 1.2H K...
  • Page 49 VG910s BOM LIST Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A 3075308757 CONN D-SUB 15P R/A PC99 W/O SCREW CN602 #N/A 3075316467 CONN DVI-I 24P P1.905 R CN601 #N/A 3075353143 CONN D-SUB FEMALE 15P P2.29 BLUE CN602 #N/A 3075415766 CONN FFC/FPC BOTTOM 30P P1.0 SMT...

  • Page 50: Exploded Diagram And Spare Parts List

    BRACKET KEYLOCK SECC 20.4*16.45*4.9 T.6 C-BC-0302-0568 3360248900 CABINET BACK ABS 41 S9LRC1LS C-BC-0302-0581 3360249101 R/C ABS 41 VG910S S9LRC1LS M-MS-0808-7739 3200648800 NAME PLATE ABS 94HB VIEWSONIC 82.83*34.9 M-CV-0830-2381 3360916300 ARM FRONT ABS 41 VX700-2 M-BK-0805-0043 3461753201 BRACKET ARM SECC 156*126.1*153.6 T2 M-MS-0808-9131 3461752800...
  • Page 51 Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 52 Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 53 Confidential - Do Not Copy ViewSonic Corporation VG910s/b...

  • Page 54: Block Diagram

    C N 6 0 2 A n a l o g I C 4 0 1 I / P H D - 1 5 C N 4 0 1 C O N D I S P L A Y E N G I N E 1 5 P I N S L V D S V G A - S D A...

  • Page 65: Pcb Layout Diagrams

    11. PCB Layout Diagrams Main Board Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 66 Main Board Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 67 Power Board Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 68 Control Board Confidential - Do Not Copy ViewSonic Corporation VG910s/b...
  • Page 69 Add.: Fax: Tel: 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) Confidential - Do Not Copy...

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