ViewSonic VA912/b-3 Service Manual
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ViewSonic VA912/b-3 Service Manual

ViewSonic VA912/b-3 Service Manual

19” color tft lcd display
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Service Manual

ViewSonic VA912/b-3
Model No. VS10931
19" Color TFT LCD Display
( VA912/b- 3_SM Rev. 1a Oct. 2005)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA912/b-3 Model No. VS10931 19” Color TFT LCD Display ( VA912/b- 3_SM Rev. 1a Oct. 2005) 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

    3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6. Troubleshooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram and Exploded Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams ViewSonic Corporation Confidential-Do Not Copy VA912/b-3...

  • Page 4: Precautions And Safety Notices

    (10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface Connector of the TFT Module. (11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 5 (IEC60950 or UL1950), or an exemption should be applied for. (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. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 6 “ MURA “ Do not touch the surface of the polarizer . Take out the monitor with cushion Take out the monitor by grasping the LCD panel. That may cause “ MURA“. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 7 Correct Methods : Incorrect Methods : Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects . That could scratch the surface of panel VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 8: Specification

    1280 x 960, 1280 x 1024 Resolution Compatibility * The image vertical size might not be full screen. But the image vertical position should be at the center. Exclusions Not compatible with interlaced video VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 9 Color = Black Separate 3-prong type plug. CCC Type Power Cable Length = 1.8m. Connects to display. Color = Black Power Saving Operation(Method) VESA DPMS Signaling Power Consumption ON Mode < 58 W (max) VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 10 1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz 1280x 720 @ 60Hz, 45kHz (HDTV) Note 1:When Vertical frequency at 85Hz or resolution, the vertical image size might not be full screen. But the VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 11 (1) ID label - The panel code “B” for CMO panel should be shown on the lower right side of ID label. (See Figure 2) (2) UPC label - The panel code “B” for CMO panel should be shown on the lower right side of UPC label. (See Figure 3) VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 12 Minimum: TBD Response Time 8ms (Tr= 2 ms, Tf = 6 ms) (typ) 10% -90% @ Ta=25°C 18 ms (Tr= 7 ms, Tf = 11 ms) (max) Panel Defects Please see Panel Quality Specifications. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 13: Front Panel Function Control Description

    Also a shortcut to toggle analog and digital connection. Power light Audio Mute button turns Green = ON the sound off Orange = Power Saving Standby Power On/Off VA912/b-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 14 • 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.) VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 15: Main Menu Controls

    9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 6500K-Adds red to the screen image for warmer white and richer red. 5400K-Adds green to the screen image for a darker color. VA912/b-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 16 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 17 OSD Timeout sets the length of time the OSD screen is displayed. For example, with a “30 second” setting, if a control is not pushed within 30 seconds, the display screen disappears. VA912/b-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 18 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. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 19: Circuit Description

    The AAT1109 is a one-channel step-up PWM controller incorporating a soft-start and a short circuit protection (SCP) function. This device consists of an on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage lockout protection, soft-start, and short circuit protection circuits. VA912/b-3 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 20 (TCON), an integrated DVI receiver, and RSDS display interface. To further reduce system costs, the TSU57AK also integrates intelligent power management control capability for green-mode requirements and spread-spectrum support for EMI management. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 21: Adjusting Procedure

    Test Pattern: Checkered Pattern Every One Pixel (50%Green & 50%B lue) Inspection Item: Flicker, Mura 5.6 Window BG Test Signal: 1280*1024@60Hz Test Pattern: Window standard pattern Inspection Item: Line Defect, Function Defect & Mura VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 22 Test Pattern: Window standard pattern Inspection Item: Particle, Line Defect, Power, Image Remain & Mura 5.10 Black Box Test Signal: 1280*1024@60Hz Test Pattern: Window standard pattern Inspection Item: Bright Dot, Line Defect & Power VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 23 Inspection Item: Bright Dot, Partial & Line Defect 5.14 Gray_Scale_0-100_V256 Test Signal: 1280*1024@60Hz Test Pattern: Vertical 64 (256) Gray Scale (Right ¡÷ Left¡AFrom 0 to 100% White) Inspection Item: Line Defect & Function Defect VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 24 Test Signal: 1280*1024@60Hz Test Pattern: Black block at the center Inspection Item: Cross Talk & Optical Character 5.17 Black_Tile Test Signal: 1280*1024@60Hz Test Pattern: Black tile under white background Inspection Item: Function Defect & Image Remain VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 25 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 FIGURE 1 FIGURE 2 Figure 3 Figure 4 VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 26 Figure 5 FIGURE 5 FIGURE 6 FIGURE 7 FIGURE 8 VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 27 ISPACK.EXE: Main program b) Ancillary .ISPACK.EXE ¡GDescription program Point plug 1.1. 2.Hardwar •D_Sub cable ¡] 15Pin¡^ •Point plug [24Pin] D_Sub cable Without to affect 1.1.3 Join VGA Cable, PC BASE, see the example picture as below. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 28 B. ISP & BIOS software file to be about to produce the next. (If the file existence already, needn’t to set up. C. repeat.) This system is applied to Win 95/98/NT/2000. Isp.lnk 1.3 ISP Execution Settings: Double Click Isp.lnk Fig.1: ISP Tool Main Menu VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 29 When ISP Tool executing at the first time, it is required to enter Security Data Please press , then input related information as Fig.2. For A190E3 ” Key in “OK Select correct Micro Controller as Fig.3. Step 2 Load MCU File Step 1 Select MTV312M64 VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 30 Installation software, Select want download correct file Step 3 Example : Step 4 The path of software Press RUN VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 31 1.4.Verification BIOS Update whether success 5. When everything is done. Please turn off the power and restart it again. Check Factory Mode and make sure it already be updated. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 32 Step 1 : Press Stand Assy’ s bottom part in Seat Hinge. Step 2 : Remove Cover Hinge. Step 3 : Loose and Remove 4 screws. Step 4: Remove Stand Assy. Step 5: Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 33 Separate Bezel hooks to take Bezel and Rear Cover apart. Step 1 : Loose and remove 2 screws. Step 2 : Separate Bezel hooks to take Bezel and Rear Cover apart. Step 3 : Remove Rear Cover. Step 4 : Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 34 3.1 Remove 2 pieces of Backlight wires. 3.2 Remove Metal Cover Step 1 : Loose and remove 4 screws. Step 2 : Loose and remove 2 screws. Step 3 : Loose and remove 4 screws. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 35 Step 4 : Remove the Cover of X-PCB. Step 5 : Completed 3.3 Remove Power PCBA Step 1 : Insert 2 pieces of Backlight wires. Step 2 : Loose and remove 4 screws. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 36 Step 3 : Remove Power PCBA. Step 4 : Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 37 Insert New Power PCBA. Step 2 : Fasten 4 fixed screws of Power PCBA . Step 3 : Completed 5. Remove AD PCBA 5.1 Remove FFC Step 1 : Remove 2 FFC from AD PCBA. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 38 Step 2 : Remove FFC 5.2 Remove AD PCBA Step 1 : Loose and remove 4 screw Step 2 : Remove AD PCBA. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 39 Step 3 : Completed 6. Change New AD PCBA Step 1 : Place New AD PCBA. Step 2 : Fasten 4 screw. Step 3 : Insert FFC. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 40 Step 4 : Insert 2 FFC. Step 5 : Completed 7 Remove OSD PCBA Step 1 : Remove FFC. Step 2 : Separate both Audio Cable. Step 3 : Take OSD PCBA apart. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 41 Step 4 : Completed. 8. Change New OSD PCBA Step 1 : Place New OSD PCBA. Step 2 : Insert Audit Cable to connectors of OSD PCBA. Step 3 : Completed. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 42 9. Add Cover to AD PCB Heatsink Step 1 : Join the cover hooks of X-PCB. Step 2 : Fasten the 4 screws. Step 3 : Fasten 2 screws. Step 4 : Fasten the 4 screws. Step 5 : Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 43 10. Rear Assy Assembly Step 1 : Place Rear Cover. Step 2 : Join Rear Cover with Bezel. Step 3 : Fasten 2 screws. Step 4 : Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 44 11. Stand Assy Assembly Step 1 : Place Stand Assy . Step 5 : Fasten 4 screws to fixed Stand Assy. Step 6 : Insert Cover Hinge. Step 7 : Place Stand Assy. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 45: Troubleshooting Flow Chart

    Dot Defect AD/B Change No display Check PCB P/B Change CNT/B Change Check Panel Panel Change D-sub cable Check Wire change AD/B Change Noise Check PCB Panel Change Check Panel TEST Next Step Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 46 P/B Change Panel Change Check Panel AD/B Change No signal Check PCB CNT/B Change Check Wire D-sub cable change Power on AD/B Change Check PCB Display Panel Change abnormal Check Panel Next Step TEST Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 47 P/B Change LED Abnormal OSD cable Change LED Flicker Check Wire Power wire connector Cable change Abnormal AD/B Change Check PCB Keyboard Unavailable P/B Change OSD cable Change Check Wire TEST Next Step Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 48 AD/B Change Display Shut Check PCB Display Down P/B Change CNT/B Change Check Panel Panel Change AD/B Change Check PCB Display flicker (tapping ) CNT/B Change Check Panel P/B Change Next Step TEST Completed VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 49 Take off e xtra accessories (such as signal extension cord). Image is not centered Use OSD Image Menu to adjust H_Position and V_Position. Check image size setting. Perform Auto Adjust. Size is not appropriate VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...
  • Page 50 Color too dark 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. VA912/b-3 ViewSonic Corporation Confidential-Do Not Copy...

  • Page 51: Recommended Spare Parts List

    7. Recommend Spare Parts List (RSPL) RECOMMENDED SPARE PARTS LIST (VA912-3) ViewSonic Model Number: VS10931-1W Rev: 1a Serial No. Prefix: PUQ Item Description ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty Accessories: Adapter, Lips Without Audio, DAC-19M001 A-00004021 BF, Ver:00 A, 19 V/2.5 A, 5 V/3 A, 4L, 4.9...
  • Page 52 Item Description ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty 42A9930008 2000 Hardware: Screw, M3*P0.5*4, f 5.5*2 HW-00000553 42A9930008 Screw, M3*P1.27*12, f 5.5*2 HW-00000556 42A9990005 42A9990005 2000 SCREW, M4, P=0.7 mm, L=15 mm, Special HW-00002442 Thin Head, Phillips Cross Recess,...

  • Page 53: Viewsonic Corporation

    RECOMMENDED SPARE PARTS LIST (VA912b-3) ViewSonic Model Number: VS10931-1W Rev: 1a Serial No. Prefix: PUR Item Description ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty Accessories: Adapter, Lips Without Audio, DAC-19M001 BF, Ver:00 A-00004021 27-D003115 27-D003115 A, 19 V/2.5 A, 5 V/3 A, 4L, 4.9 mA, 2380 V...
  • Page 54 BOM LIST (VA912/b-3) ViewSonic Model Number: VS10931-1W Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A MJ0E501K01 19" Semi Product,19E5-L01,Default #N/A L3J005XXXX 19"E5 TN PS Asahi 0.7mm glass common CF Polarizer M190E5,383.15x307.85x0.215,135°,Optimax LPT- #N/A 7414119023 HL56-T12AGA1SU common TFT Polarizer M190E5,380.52x304.13x0.215,135°,Optimax LPT-...
  • Page 55 Item ViewSonic P/N Ref. P/N Description Location Q'ty Olympic,A190E3,ID BOM,D-sub+DVI+Audio,USA,Black,VSC, Olympic,19",ID BOM,D-sub+DVI+Audio,USA,Silver Black,VSC, Olympic,A190E3,ID BOM,D-sub+DVI+Audio,China,Black,VSC, Olympic,A190E3,ID BOM,D-sub+DVI+Audio,China,Silver Black,VSC, PJ0EI1F300(A1F) Olympic,A190E3,ID BOM,D- PJ0EI2F300(A2F) sub+DVI+Audio,European,Black,VSC, PJ0EI1F303(C1F) Olympic,A190E3,ID BOM,D-sub+DVI+Audio,European,Silver PJ0EI2F303(C2F) Black,VSC, PJ0EI1F301(E1F) Olympic,A190E3,ID BOM,D-sub+DVI+Audio,UK,Black,VSC, PJ0EI2F301(E2F) Olympic,A190E3,ID BOM,D-sub+DVI+Audio,UK,Silver PJ0EI1F302(K1F) Black,VSC, PJ0EI2F302(K2F) Olympic,A190E3,ID BOM,D-sub+DVI+Audio,TWN,Black,VSC, PJ0EI1F304(W1F)

  • Page 56: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 57 EXPLODED PARTS LIST (VA912/b-3) ViewSonic Model Number: VS10931-1W Rev: 1a Item ViewSonic P/N Ref. P/N Description Q'ty #N/A PJ0EFH0Q06 ISM_A190E3_HAT C-00004025 40-D003819 Bezel Assy,A190E3-H0F,SILVER PANTONE 877C #N/A 40-D003809 BEZEL #N/A 40-D003811 LENS #N/A 40-D003805 KEYPAD #N/A 33-D000377 SPEAKER 4 ohm 2W...

  • Page 58: Block Diagram

    9. Block Diagram Speaker OSD Key Pad / Audio Out Audio In 3.3V DVI-D Digital Video Main Board LCD Module D-sub Signal Analog Video DC/DC DC-5V DC-19V LIPS AC Power Backlight VA912/b-3 ViewSonic Corporation Confidential - Do Not Copy...

  • Page 59: Schematic Diagrams

    DC/DC V18C V33C GVON GVON GVOFF GVON GVOFF GVOFF V33P GMA[1..14] PANEL_ON/OFF GMA[1..14] GMA[1..14] VCM_PWM INVERTER I/F V33P V33C V33P POWER V18C V33C INV_ON/OFF INV_ADJ INV_ADJ ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 60 CP20 CP20 GND_POWER CP37 CP37 GND_POWER GND_POWER RP50 RP50 CP38 CP38 CP39 CP39 RP52 RP52 RP53 RP53 RP51 RP51 CP40 CP40 ViewSonic Corporation RP54 RP54 DC/DC GND_POWER Model GND_POWER Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 61 C163 C163 DAT1- DAT2+ DAT2- VCLK DAT3+ DAT3- DAT4+ GND_POWER DAT4- GND_POWER DAT5+ DAT5- clk+ clk- CLK+ GND_POWER CLK- R213 R213 V5A_ESD GND_POWER GND_POWER ViewSonic Corporation DVI INTERFACE Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 62 GND_INV R198 R198 V33C R199 R199 C162 C162 R200 R200 INV_ON/OFF GND_POWER V33C R196 R196 R195 R195 V33C R197 R197 INV_ADJ GND_POWER ViewSonic Corporation INVERTER I/F Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 63 KEY_DOWN GND_POWER R193 R193 KEY_UP 10/20 SOURCE_SELECT VCM_PWM AUTO_ADJ PWR_SW LED_GR LED_OR DCDC_ON/OFF SCL1 SDA1 PANEL_ON/OFF GND_POWER GND_POWER (PANEL POWER CONTROL) VCPU DDC_DAT GND_POWER DDC_CLK GND_POWER ViewSonic Corporation Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 64 R216 R216 R217 R217 R184 R184 AUD_L1 AUD_L1 LED_G LED_GR AUD_G1 AUD_G1 AUD_R C169 C169 C170 C170 C167 C167 C168 C168 GND_AUD GND_AUD GND_AUD ViewSonic Corporation OSD INTERFACE Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 65 EG2N EG1P EG1P EG1N EG1N EG0P EG0P EG0N EG0N GND_POWER ER2P ER2P V33B ER2N ER2N ER1P ER1P ER1N ER1N ER0P ER0P ER0N ER0N GND_POWER ViewSonic Corporation Model PANEL I/F Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 66 C110 C110 C114 C114 C112 C112 C113 C113 GND_POWER C111 C111 C115 C115 R108 R108 GND_POWER GND_POWER GND_POWER VCM_PWM GND_POWER GND_POWER VCM_PWM GND_POWER GND_POWER GND_POWER ViewSonic Corporation POWER Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 67 R138 GND_POWER VOL1 VOL1 C164 C164 GND_POWER R210 R210 VOL1 R212 R212 R211 R211 C165 C165 C166 C166 V33C V33C GND_POWER GND_POWER V18C V18C ViewSonic Corporation GND_POWER Model SCALER Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 68 DDC_DAT (0603/100) R133 R133 VGA_5V C128 C128 03/08/04 R134 R134 03/08/04 C129 C129 R135 R135 12/15/2003 R136 R136 GND_POWER VCLK R137 R137 VGA_5V GND_POWER GND_POWER ViewSonic Corporation GND_POWER Model Title Date Rev: Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...

  • Page 69: Pcb Layout Diagrams

    11. PCB Layout Diagrams Confidential - Do Not Copy VA912/b-3 ViewSonic Corporation...
  • Page 70 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) VA912/b-3 ViewSonic Corporation...

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