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TABLE OF CONTENTS 

 

 

1.  Precautions and Safety Notices 

  1 

2.  Specification 

  5 

3.  Front Panel Function Control Description 

13 

4.  Circuit Description 

15 

5.  Adjustment Procedure 

26 

6.  Troubleshooting Flow Chart 

52 

7.  Recommended Spare Parts List 

55 

8.  Exploded Diagram and Exploded Parts List 

58 

9.  Block Diagram 

62 

10.  Schematic Diagrams 

63 

11.  PCB Layout Diagrams 

68 

 

 

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Corporation 

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VA912-4_VA912b-4

Summary of Contents for VA912-4

Page 1: ...Model No VS10867 19 Color TFT LCD Display Service Manual ViewSonic VA912 4 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 VA912 4_VA912b 4_SM Rev 1c Jun 2006 VA912b 4...

Page 2: ...rticular purpose 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 su...

Page 3: ...ption 13 4 Circuit Description 15 5 Adjustment Procedure 26 6 Troubleshooting Flow Chart 52 7 Recommended Spare Parts List 55 8 Exploded Diagram and Exploded Parts List 58 9 Block Diagram 62 10 Schema...

Page 4: ...of the high voltage used in the inverter circuit the voltage is exposed in such areas as the associated transformer circuits 4 LCD Module Handling Precautions 4 1 Handling Precautions 1 Since front p...

Page 5: ...D contains a small amount of mercury Please follow local ordinances or regulations for disposal 13 The LCD module contains a small amount of materials having no flammability grade The LCD module shoul...

Page 6: ...VA912 4 series handling Notice Correct Method Incorrect method Correct Method Incorrect method Correct Method Incorrect method 3 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 7: ...Correct Method Incorrect method Correct Method Incorrect method 4 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 8: ...rate Audio 1W x 2 Power Cable a Refer to Appendix D b U model 2 power cables are required 1 Schuko CEE7 7 Type Plug 2 Separate 3 prong BS 1363 Type Plug Analog Cable 1 8 m color black with PC 2001 and...

Page 9: ...out Compliant DDC 2B Video Signals 1 Video RGB Analog 2 DVI Digital Separate Video Impedance 75 Ohms Analog Maximum PC Video Signal 950 mV with no damage to monitor Maximum Mac Video Signal 1250 mV wi...

Page 10: ...ll be able to withstand 2KV L L and 2 3KV L PE with no damage Power Supply Missing Cycle Immunity Shall be able to function properly without reset or visible screen artifacts when cycle of AC power is...

Page 11: ...5Hz 53 7kHz Yes Yes 15 832 x 624 75Hz 49 7kHz Yes Yes 16 1024 x 768 60Hz 48 4kHz Yes Yes 17 1024 x 768 70Hz 56 5kHz Yes Yes 18 1024 x 768 72Hz 58 1kHz Yes Yes 19 1024 x 768 75Hz 60 0kHz Yes Yes 20 102...

Page 12: ...wer 1 Button 1 2 Button 2 Up arrow button Down arrow button X X MUTE Note Power Button Button 1 and Button 2 and Mute Button must be one shot logic operation i e there should be no cycling Reaction Ti...

Page 13: ...tion CT 6500K Contrast Max Brightness Max 250 cd m2 Typ after 30 minute warm up 200 cd m2 Min after 30 minute warm up Brightness Uniformity 9 Points U 80 typ 75 Min U Min Luminance in 5 points Max Lum...

Page 14: ...6500K Contrast Max Brightness Max 300 cd m2 Typ after 30 minute warm up 240 cd m2 Min after 30 minute warm up Brightness Uniformity 9 Points U 70 Min U Min Luminance in 5 points Max Luminance in 5 po...

Page 15: ...mitted for approval to ViewSonic before Mass Production Drop Test 100G Weak Corner 76 2 cm Six Faces 76 2 cm 3 Edges Radiating From Weak Corner 76 2 cm Drop Test Data shall be submitted for approval t...

Page 16: ...3 Front Panel Function Control Description 13 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 17: ...oming from the graphics card in your computer See your graphic card s user guide for instructions on changing the resolution and refresh rate vertical frequency VESA 1280 x 1024 60 Hz recommended mean...

Page 18: ...led with UP DOWN key 1 5 Audio volume can be controlled with up key and down key when Audio Adjust menu is active 1 6 Pushing Mute key can disable audio output 2 CONNECTORS 2 1 AC inlet CEE22 typed co...

Page 19: ...el 2 3 GND Logic Ground 4 RX4 Reserved No connection 5 RX4 Reserved No connection 6 SCL DDC2B Clock 7 SDA DDC2B Data 8 VS Reserved No connection 9 RX1 TMDS negative differential input channel 1 10 RX1...

Page 20: ...cification this LCD display can automatically function with a certain position Horizontal Sync frequency 30 82 kHz Vertical Sync frequency 50 85 Hz 3 4 Signal level and input impedance 3 4 1 Video Sig...

Page 21: ...30 35 30 31 30 30 30 30 31 0A 90 00 00 00 FD 00 32 55 1E 52 0E 100 00 0A 20 20 20 20 20 20 00 00 110 00 FC 00 56 41 39 31 32 2D 34 120 53 45 52 49 45 53 00 18 _________________________________________...

Page 22: ...38 53 Standard Timing Identification 1280 X 1024 60Hz 1280 X 960 60Hz 1152 X 864 75Hz 1024 X 768 85Hz 800 X 600 85Hz 640 X 480 85Hz Not Used Not Used __________________________________________________...

Page 23: ...__________________________________________________ 108 125 Detailed Timing Descriptor Block 4 Monitor Name VA912 4SERIES 126 No Extension EDID Block s 127 CheckSum OK 5 2 Digital EDID Digital EDID is...

Page 24: ...anufacture _________________ 2005 10 17 Complete Serial Number ______________ See Descriptor Block 18 EDID Version Number _________________ 1 19 EDID Revision Number ________________ 3 20 VIDEO INPUT...

Page 25: ..._______ Horizontal Image Size 376 mm Vertical Image Size 301 mm Refreshed Mode Non Interlaced Normal Display No Stereo Horizontal Active Time 1280 pixels Blanking Time 408 pixels Sync Offset 48 pixels...

Page 26: ...nctional areas flat panel controller flash ROM power regulator and Audio amplifier 6 1 1 Flat panel controller RTD2523 U6 The heart of the system board is the scalar chip of RTD2523 The RTD2523 is a h...

Page 27: ...put 6 1 2 Power Regulator AIC1117 U1 U3 The AIC1117 is a low dropout positive adjustable regulator with minimum of 800mA output current capability So it is well suited for 3 3 V and 2 5 V Regulator U3...

Page 28: ...rical specification described as below Rated Input Voltage 90 264Vac 47 63Hz Operation Input Voltage 100 240Vac 50 60Hz Input Current 1 8A 90Vac Inrush Current 100A 90Vac Cold start INPUT Efficiency 8...

Page 29: ...x 480 72Hz 37 9kHz Yes Yes 7 640 x 480 75Hz 37 5kHz Yes Yes 8 640 x 480 85Hz 43 27kHz Yes Yes 9 720 x 400 70Hz 31 5kHz Yes Yes 10 800 x 600 56Hz 35 1kHz Yes Yes 11 800 x 600 60Hz 37 9kHz Yes Yes 12 80...

Page 30: ...mance RGB color Check the color temperature of RGB signal color Pattern 3 4 5 4 Sub pixel defect RGB color Check the sub pixel defect Pattern 3 4 5 5 Full white Full white Check the brightness and con...

Page 31: ...Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 28 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 32: ...he brightness Press the button to decrease the brightness Press the 2 button to enter the contrast adjustment page Press the 1 button to exit the page 3 Input Select Page Press the 2 button to switch...

Page 33: ...age Press the button to shift the image to the right Press the button to shift the image to the left b Vertical Position Press the 2 button to return to the horizontal position adjustment page Press t...

Page 34: ...n adjustment page Press the 1 button to exit the page a Horizontal Position Option Press the 2 button to enter the vertical position adjustment page Press the 1 button to exit the page Press the butto...

Page 35: ...utton to toggle between analog and digital modes B When in Digital Input Mode 1 Main Menu Press the 1 Menu button to enter the Main Menu Press the button to highlight the previous item or the button t...

Page 36: ...ton to exit the page Red Green Blue Options Press the 2 button to cycle among the colors Press the 1 button to exit the page Press the button to increase the selected color level Press the button to d...

Page 37: ...zontal Position Option Press the 2 button to enter the vertical position adjustment page Press the 1 button to exit the page Press the button to shift the menu to the right Press the button to shift t...

Page 38: ...alog Press the 2 button to toggle between analog and digital modes C Other Information When the No Signal or Out of Range messages appear If no input signal is detected the No Signal message will appe...

Page 39: ...hether the firmware version If not please following procedure to upgrade to the latest version 1 Equipment needed VA912 4 VA912b 4 VA912 4U PC Personal computer LPT cable Fixture LM5ISP Firmware upgra...

Page 40: ...PC or notebook parallel printer cable ISP tooling Software If OS was Win2000 or WinXP please install PORT95NT exe In order to ensure can execute ISP program please set BIOS in PC or Notebook as Fig 0...

Page 41: ...ORT95NT exe in Windows install the program see Fig 0 1 Fig 0 1 0 2 Keep on press Next 4 times to go through the installation processes see Fig 0 2 Fig 0 2 38 ViewSonic Corporation Confidential Do Not...

Page 42: ...ose Typical t hen press Next see Fig 0 3 Fig 0 3 0 4 Keep on press Next 4 times to go through the installation processes see Fig 0 4 Fig 0 4 39 ViewSonic Corporation Confidential Do Not Copy VA912 4_V...

Page 43: ...0 5 Install completed restart the PC or notebook See Fig 0 5 Fig 0 5 40 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 44: ...n Century website www myson com tw 1 2 After extracting the ZIP file the total files list as Fig 1 0 and double click the file of setup exe to install Fig 1 0 1 3 Press Next button to continue see Fig...

Page 45: ...Change button for selecting the path that you want and then press Next button to continue see Fig 1 2 Fig 1 2 1 5 Press Install button to continue see Fig 1 3 Fig 1 3 42 ViewSonic Corporation Confiden...

Page 46: ...g 1 4 Fig 1 4 Appendix B How to use software to upgrade the BIOS 2 1 After installation we could find the shortcut in the setting path or the program bar default setting see Fig 2 1 Fig 2 1 43 ViewSon...

Page 47: ...K button see Fig 2 2 Fig 2 2 2 3 The warning is used to remind user of that different CPU rate may cause ISP function fail it s limited by IIC protocol press OK button see Fig 2 3 Fig 2 3 44 ViewSonic...

Page 48: ...g 2 5 shows the setting for security code of software ISP it needs 2 command No and key in command sequentially for 7C 4C 77 The command No and command must be set by user while coding About the detai...

Page 49: ...1 3 2 If user change the MTV type it must load file again or the buffer of load file will be cleared 3 3 CRC cyclic redundancy check the host can check CRC register s result instead of reading every...

Page 50: ...ur from carton 2 Put the monitor on desk face down 3 Remove the I O cover 4 Loose the screws remove the stand 5 Separate the hook by tool coin or screw driver 6 Remove the bezel cover AL Foil 47 ViewS...

Page 51: ...e shielding screw 9 Tear off the yellow tape 10 Tear off the black tape 11 Loose the Button B screw 12 Move the Button board 13 Remove the speaker 14 Remove the shielding 48 ViewSonic Corporation Conf...

Page 52: ...15 Remove the AL foil 16 Remove the AL Foil black tape 17 Loose the shield 18 Loose the bezel screw 49 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 53: ...19 Loose the BKT screw L R 20 Remove the PCBA mylar 21 Take out PCBA remove the cables 50 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 54: ...monitor into the PE or EPE bags 3 Put on the end cap left right 4 Put the monitor into carton 5 Put all accessories into carton 6 Seal the monitor Face up handler Power cable Base VGA DVI cable Users...

Page 55: ...Hz And Y2 11 092MHz Check U3 pin 2 Output 2 5V Change U1 Change U3 Change Y1 or Y2 Change M B Check CN1 pin 5 6 5V correct OK OK OK No No No No Check button cable button board OK Change cable or butto...

Page 56: ...n12 Mute pin11 Stby Check CN1 pin 1 2 12V Check U9 pin6 Volume and Q15 Change M B Check Input source or Change J3 Change Speaker or JP2 Cable Change power board module Change Q15 Change U9 OK OK OK OK...

Page 57: ...l Check panel cable Check open short of U6 Check panel power supply of Check panel Change M B Change panel cable Repair open short Change Q8 Change panel OK OK OK OK No No No No 54 ViewSonic Corporati...

Page 58: ...7V002019 EPE bag 1 40 Plastics W0VA STAND ASSY S B PL 00004163 26W0VASA016 stand 1 Remark 1 Above listed items are examples supplier can expand the rows to add more necessary items Remark 2 All revise...

Page 59: ...S 0808 9247 EBL70023013 WIRE MOUNTS L70L E EBL70023 REV3A GP 1 43 N A GAL70003011 RUBBER HOLDER L70L E GAL70003 REV3A GP 2 44 M SCW 0824 6761 MM30030IBJ4 SCREW M3 3 I NI GP 4 45 N A FCL9ZA02015 AL FOI...

Page 60: ...0023013 WIRE MOUNTS L70L E EBL70023 REV3A GP 1 43 N A GAL70003011 RUBBER HOLDER L70L E GAL70003 REV3A GP 2 44 M SCW 0824 6761 MM30030IBJ4 SCREW M3 3 I NI GP 4 45 N A FCL9ZA02015 AL FOIL L9ZA A1 FCL9ZA...

Page 61: ...8 Exploded Diagram and Exploded Parts List Model Title Date Rev ViewSonic Corporation 58 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 62: ...VA GP 1 21 E 00004177 DN0TE200F00 SPEAK ASSY L9VA FG TE200 1 5W 2 GP 1 22 N A FCL5M005011 AL FOIL PANEL L5M 2 23 M MS 0808 9247 EBL70023013 WIRE MOUNTS L70L E GP 1 24 N A GAL7TA01016 RUBBER FOOT L7TA...

Page 63: ...U001 CABLE MB BUTTON 10P 10P 280MM L9VA GP 1 21 E 00004177 DN0TE200F00 SPEAK ASSY L9VA FG TE200 1 5W 2 GP 1 22 N A FCL5M005011 AL FOIL PANEL L5M 2 23 M MS 0808 9247 EBL70023013 WIRE MOUNTS L70L E GP 1...

Page 64: ...9 CB 00002602 DDL7VDPC005 VGA CABLE 1 10 CB 00004149 DD0L0TPC007 AUDIO CABLE 1 11 C 00004165 38W0VABS001 Base assy 1 PACKING PART LIST VA912b 4 ViewSonic Model Number VS10867 Rev 1a Item ViewSonic P N...

Page 65: ...AB Triple ADC Interface Clock Gen CPU MTV312V64 CSZ IRQ RST Crystal 11 0592MHZ Keypad Panel Interface Backlight TX1 TX1 TX2 TX2 TX3 TX3 AIC117ADJ 3 3V 2 5V AC IN 12V 5V 5V 5V VBRI 3 3V 2 5V Mute Volu...

Page 66: ...5 6 7 8 9 R16 1K 6 C3 0 1u 6 C100 0 1u 6 R8 0 6 U3 AIC1117CY 3 1 2 4 VIN GND VOUT VO U1 AIC1117CY 3 1 2 4 VIN GND VOUT VO L28 CX201209805 8 C5 0 1u 6 C102 1U 6 R18 4 7K 6 EC3 10uF 16V 1 2 3 4 5 6 7 8...

Page 67: ...217K 2 1 3 R31 100 6 D24 Z5 6 1 2 R33 100 6 L9 FCB1608C 190T03 6 D28 Z5 6 1 2 R45 2K 6 R46 100 6 C19 0 047u 6 R26 100 6 L8 FCB1608C 190T03 6 C31 1U 6NC CN4 DVI D NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15...

Page 68: ...71 121 49 72 57 58 26 97 83 95 96 84 98 113 110 112 127 25 24 21 22 23 20 19 18 17 16 78 79 80 81 82 85 86 87 88 89 90 106 107 91 51 52 53 55 59 60 61 62 63 64 65 66 67 68 73 74 75 76 77 104 93 102 10...

Page 69: ...NC 100K 6 U8 24LC16 1 2 3 4 5 6 7 8 A0 A1 A2 VSS SI SCK WP VCC Q12 2N3906 2 1 3 R101 1K 6 R90 33K 6 C103 NC 1U 16V R102 220 6 R91 33K 6 D32 NC 1N4148 R114 4 7K 6 R103 220 6 R110 4 7K 6 JP3 1 3 2 4 5 6...

Page 70: ...15 16 1 2 3 19 20 18 INL INR VAROUT_L VOLUME VAROUR_R OUTL OUTR MUTE STBY SVR GND VS VS GND GND GND GND GND GND C92 0 47U 8 C95 220P 6 R139 10K 6 R141 10K 6 L25 600 CX601T02001 1 2 C97 330U 16V C89 1U...

Page 71: ...11 PCB Layout Diagrams MB TOP 68 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 72: ...69 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 73: ...70 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 74: ...71 ViewSonic Corporation Confidential Do Not Copy VA912 4_VA912b 4...

Page 75: ...Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Exploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout Diagrams B Are you satisfied with this Service Manual Item Excellen...

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