Service Manual ViewSonic VA912-4 VA912b-4 Model No. VS10867 19” Color TFT LCD Display (VA912-4_VA912b-4_SM Rev. 1c Jun.
Copyright Copyright ¤ 2006 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.
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.
1. Precautions and Safety Notices 1. Appropriate Operation (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Turn off the product before cleaning. Use only a dry soft cloth when cleaning the LCD panel surface. Use a soft cloth soaked with mild detergent to clean the display housing. Use only a high quality, safety approved AC/DC power cord. Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.
(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module may be damaged. (12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local ordinances or regulations for disposal.
VA912-4 series handling Notice Correct Method Incorrect method Correct Method Incorrect method Correct Method Incorrect method ViewSonic Corporation 3 Confidential - Do Not Copy VA912-4_VA912b-4
Correct Method Incorrect method Correct Method Incorrect method ViewSonic Corporation 4 Confidential - Do Not Copy VA912-4_VA912b-4
2. Specification PRODUCT DEFINITION AND SPECIFICATION Region VSA VSAP VSE VSCN (M) (A)/(S)/(K) (E)/(U) (G) Product Name VA912/b-4 / VA912-4U Model Number VS10867 OSD Languages TFT LCD Panel and Model # Scalar English, French, German, Italian, Spanish, Finnish, Japanese, Traditional Chinese, Simplified Chinese Vendor : HSD, Model # : 190ME13 A02 / A03 Vendor : HSD, Model # : 190ME13 A12 / A16 Model # : RTD 2523b Input Signal Analog / Digital Sync Compatibility Separate Audio 1W x 2 a.
GENERAL SPECIFICATION Test Resolution & Frequency 1280x1024 @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default: Contrast = 70%, Brightness = 100% VIDEO INTERFACE Analog Input Connector DB-15 (Analog), refer the appendix A Digital Input Connector DVI-I (digital) Default Input Connector Defaults to the first detected input Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes Video Cable Connector DB-15 Pin out Compliant DDC 2B Video
POWER SUPPLY Power Supply (Adapter) Input Voltage Range Input Frequency Range Short Circuit Protection Over Current Protection Leakage Current EFFICIENCY Fuse Power Dissipation Max Input AC Current INRUSH CURRENT (COLD START) Power Supply Cold Start Power Supply Transient Immunity Power Supply Line Surge Immunity Power Supply Missing Cycle Immunity Power Supply Acoustics US Type Power Cable European Type Power Cable CCC Type Power Cable PSE Type Power Cable Power Saving Operation(Method) Power Consumption
ELECTRICAL REQUIREMENT Horizontal / Vertical Frequency Horizontal Frequency 30 – 82 KHZ Vertical Refresh Rate 50 – 85* HZ. Maximum Pixel Clock 135 MHz Sync Polarity Independent of sync polarity. TIMING TABLE Item Timing 1 640 x 350 @ 70Hz, 31.5kHz 2 640 x 400 @ 60Hz, 31.5kHz 3 640 x 400 @ 70Hz, 31.5kHz 4 640 x 480 @ 60Hz, 31.5kHz 5 640 x 480 @ 67Hz, 35.0kHz 6 640 x 480 @ 72Hz, 37.9kHz 7 640 x 480 @ 75Hz, 37.5kHz 8 640 x 480 @ 85Hz, 43.27kHz 9 720 x 400 @ 70Hz, 31.5kHz 10 800 x 600 @ 56Hz, 35.
FRONT PANEL CONTROLS AND INDICATORS Front Panel Hardware Controls Power Switch (Front Head) Power Control, soft Power Switch. Power LED (Front Head) Green – ON Orange – Active Off Dark = Soft Power Switch OFF Front Panel Controls (Head) [XX] [ 1 ] [? ] [? ] [ 2 ] [ ] [ ] Power [ 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.
Panel Characteristics: 1st Panel Source Model number HSD 190ME13-A02 / A03 Type TN type with LVDS interface Active Size 376.32 (H) x 301.056 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.
2nd Panel Source Model number HSD 190ME13-A12 / A16 Type TN type with LVDS interface Active Size 376.32 (H) x 301.056 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.
MECHANICAL Dimension (Desktop) Width 437 mm (17.2 inch) Height 419 mm (16.5 inch) Depth 216 mm (8.5 inch) Monitor Weight 4.7 Kg/ 10.4 lbs *Refer to Figure 1 Ergonomics Tilt Up ≧ 20 º to 18° Tilt Down ≦ -5 º to -3° Vibration Test ● Vibration Frequency : 2 – 200 Hz ● Acceleration : 1.14 G RMS ● Sweep Time : 1 oct.
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ViewSonic VA921-4/VA921b-4/VA912-4U Main Menu Controls Adjust the menu items shown below by using the up and down buttons. A. Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. NOTE: Auto Image Adjust works with most common video cards. If this function does not work on your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value. B.
4. Circuit Description 1. Outline 1.1 Power On/Off, up arrow- button, down arrow button, (1) MENU button, (2) Enter button, Mute button on the front panel. 1.2 D-sub 15pin connector, DVI-D connector, audio line-in receptacle, and AC-IN are located on the back side of the cabinet. 1.3 OSD menu includes the following function; Auto Image Adjust (only active under analog input) Contrast/Brightness Input Select Audio Adjust Color Adjust Information Manual Image Adjust Setup Menu Memory Recall 1.
2.4 Video signal connector for digital input: 24pin DVI-D connector CN9 RX2RX2+ GND RX4RX4+ SCL SDA VS RX1RX1+ GND RX3RX3+ 5V GND HP RX0RX0+ GND RX5RX5+ GND RXC+ RXC- Pin No. 3. RX2- TMDS negative differential input, channel 2 2 RX2+ TMDS positive differential input, channel 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.
3.2 POWER 3.2.1 Power supply Input voltage 100~240Vac Power frequency 50~60Hz Input current 3.2.2 <1.8Arms@90Vac Inrush current 100A(Max) at 90Vac(cold start) Power consumption 36W(typical);40Watts(Max) Power Management State Power Indicator On 36Watts Blue Standby < 1Watts Amber Off <1Watts Off 3.3 Acceptable timing If the timing is within following specification, this LCD display can automatically function with a certain position.
5. EDID data 5.1. Analog EDID: Analog EDID is stored in U8.
Preferred Timing Mode Display Type = R/G/B Color (25-34) CHROMA INFO: Red X - 0.647 Green X - 0.292 Blue X - 0.142 White X - 0.310 Red Y - 0.327 Green Y - 0.614 Blue Y - 0.079 White Y - 0.
Border: 0 lines Frequency: 60.02 Hz Digital Separate, Horizontal Polarity (+) Vertical Polarity (+) ______________________________________________________________________ (72-89) Detailed Timing / Descriptor Block 2: Monitor Serial Number: PW8050100001 ______________________________________________________________________ (90-107) Detailed Timing / Descriptor Block 3: Monitor Range Limits: Min Vertical Freq - 50 Hz Max Vertical Freq - 85 Hz Min Horiz. Freq - 30 KHz Max Horiz.
0 1 2 3 4 5 6 7 8 9 ________________________________________ 0 | 00 FF FF FF FF FF FF 00 10 | 1C 72 00 00 00 00 01 0F 20 | 80 26 1E 78 2E FD 56 A5 30 | 9D 24 14 4F 54 BF 40 | 81 40 71 4F 61 59 45 59 31 59 50 | 31 0A 01 01 30 2A 00 98 51 00 60 | 2A 40 30 70 13 00 78 2D 11 00 70 | 00 1E 00 00 00 FF 00 50 57 38 80 | 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
800 X 600 @ 72Hz (VESA) 800 X 600 @ 75Hz (VESA) 832 X 624 @ 75Hz (Apple,Mac II) 1024 X 768 @ 60Hz (VESA) 1024 X 768 @ 70Hz (VESA) 1024 X 768 @ 75Hz (VESA) 1280 X 1024 @ 75Hz (VESA) (37) Manufacturer's Reserved Timing: 1152 X 870 @ 75Hz (Apple,Mac II) (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 640 X 400 @70Hz Not Used ______________________________________________________________________ (54-71) Detailed Tim
Monitor Range Limits: Min Vertical Freq - 50 Hz Max Vertical Freq - 85 Hz Min Horiz. Freq - 30 KHz Max Horiz. Freq - 82 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4: Monitor Name: VA912-4SERIES (126) No Extension EDID Block(s) (127) CheckSum OK 6. THEORY OF OPERATION This section describes the function of the LCD monitor per functional block.
Green - 35 Blue + 30 Blue - 31 H sync 42 V sync 43 d) Embedded OSD: Embedded 11.25K SRAM dynamically stores OSD command and fonts. e) On chip TMDS receiver: The RTD2523 integrated TMDS receiver, which operates up to 165MHz and can directly connect to all DVI compliant TMDS transmitters. The TMDS signals are connected to RTD2523 as described bellow: f) Pin Name Pin NO.
OUTPUT On / off control Voltage 2~5.25 for on, 0~0.13 for off Rated Output Strike-on Voltage 1500~2000Vrms Rated Output Voltage 710Vrms at 6mA Rated Output Frequency 40~50KHz Rated Output Current 6~7mA 6.3.2 Power Electrical specification described as below. INPUT OUTPUT ViewSonic Corporation Rated Input Voltage 90~264Vac, 47~63Hz Operation Input Voltage 100~240Vac, 50~60Hz Input Current <1.
5. Adjustment Procedure 1. Function test (1) Test equipment Color video signal and pattern generator (or PC with SXGV resolution) (2) Test condition Before function testing and alignment, the unit must warm up for at least 30 minutes under the following conditions: 1. Room temperature 2. With full-white screen , RGB , black pattern 3. with cycled display modes. 2. Test display modes Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Timing 640 x 350 @ 70Hz, 31.
3. Test pattern Item 1 Test condition Frequency & performance Pattern Cross-hatch pattern 2 Monitor saturation 16-gray scale pattern 3 RGB color performance RGB color 4 Sub-pixel defect RGB color 5 Full white Full white 6 7. 8.
Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation 28 Confidential - Do Not Copy VA912-4_VA912b-4
OSD Function Menu A. When in Analog 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 to highlight the next item. Press the [1] (Menu) button to exit the Main Menu. (1) Auto Image Adjust Page: Press the [2] button to execute the auto image adjust function. Press the [1] button to exit the page. (2) Contrast/Brightness Page: Press the [2] button to enter the contrast adjustment page.
Press the [1] button 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 decrease the selected color level. (6) Information Page: Press the [2] button to enter the information page. Press the [1] button to exit the information page. (7) Manual Image Adjust Page: Press the [2] button to enter the manual image adjustment page.
Press the [2] button to enter the setup menu page. Press the [1] button to exit the page. Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item. 1) Language Select Item Press the [2] button to enter the language selection page. Press the [1] button to exit the page. Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item. English, French… Option Press the [2] button to select the language.
Press the [1] button to exit the page. (9) Memory Recall Page Press the [2] button to execute the memory recall function. Press the [1] button to exit the page. 2. Other Menu: This “shortcut” menu is directly accessible without bringing up the OSD. (1) Contrast Dialog Press the [▲] or [▼] button to enter the Contrast Dialog. Press the [1] button to exit the Contrast Dialog. Press the [2] button to enter the Brightness Dialog. Press the [▲] button to increase the contrast.
(3) Input Select Page: Press the [2] button to switch to analog input mode. (4) Audio Adjust Page: Press the [▲] button to increase the volume. Press the [▼] button to decrease the volume. Press the [2] button to enable or disable mute function . Press the [1] button to exit the page. (4) Color Adjust Page: Press the [2] button to enter the color adjustment page. Press the [1] button to exit the page. Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item.
Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item. 1) Language Select Item Press the [2] button to enter the language selection page. Press the [1] button to exit the page. Press the [▲] button to highlight the previous item or the [▼] button to highlight the next item. English, French… Option Press the [2] button to select the language. Press the [1] button to exit the page. 2) Resolution Notice Item Press the [2] button to enter the resolution notice page.
(8) Memory Recall Page Press the [2] button to execute the memory recall function. Press the [1] button to exit the page. 2. Other Menu: This “shortcut” menu is directly accessible without bringing up the OSD. (1) Contrast Dialog Press the [▲] or [▼] button to enter the Contrast Dialog. Press the [1] button to exit the Contrast Dialog. Press the [2] button to enter the Brightness Dialog. Press the [▲] button to increase the contrast. Press the [▼] button to decrease the contrast.
Firmware update procedure : When you received a received monitor , please check whether the firmware version. If not , please following procedure to upgrade to the latest version . 1.
2. Connection : To PC To Monitor Appendix A : How to install the software for ISP : 0. To setup ISP environment : Hardware: 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 0.0 Fig 0.
0.1 Double-click the “ PORT95NT.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.
0.3 Choose “ 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.
0.5 Install completed , restart the PC or notebook. See Fig 0.5 Fig. 0.
1. Install ISP 1.1 User could download ISP driver and PORT95NT install from Myson 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 1.1 ViewSonic Corporation Fig 1.
1.4 Keep default setting or press “ 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.
1.6 Installation has finished , press “ Finish “ button , see Fig 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.
2.2 Security file is a key to use ISP function , press “ OK “ 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.
2.4 Press “ Create Se curity File “ button to key in Security code . Adjusting bar to decrease speed of IIC bus , See Fig. 2.4 . Fig. 2.4 2.5 Fig 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 detailed of setting , please refer to section 6 boot code of ISP . Fig. 2.
Appendix C : Use ISP to program MCU 3.1 Select MTV type first , load the binary or intel hex file that you want to program into the MCU , and select “ AUTO” item , then press “ RUN “ button , see fig3.1 Fig. 3.1 flash . 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 byte in Fig.3.
VA912-4 series de-assembling procedure 1. Move the monitor our 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.
7. Pull out the CCFL cables 8. Loose the 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.
15. Remove the AL-foil 16.Remove the AL-Foil & black tape 17. Loose the shield 18.
19. Loose the BKT screw L/R 20. Remove the PCBA & mylar 21.
VA912-4 series packing method 1. Sticker on LCD protection film 2. Put the monitor into the PE or EPE bags 3. Put on the end-cap left / right 4. Put the monitor into carton Face-up 5. Put all accessories into carton 6.
6. Troubleshooting No power No Power Check CN1 pin 5,6 No 5V correct? Change power board module OK Check U1 pin2 No Change U1. No Change U3 Output 3.3V? OK Check U3 pin 2 Output 2.5V? OK Check X’tal Y1=24.576MHz? No Change Y1 or Y2 And Y2=11.
No Audio No Audio Output Check Input Signal J3 OK? No Check Input source or Change J3 No Change Speaker or JP2(Cable) No Change power board module OK Check JP2 to Speaker OK? OK Check CN1 pin 1,2=12V? OK Check U9(pin6) Volume and Q15 No Change Q15 OK Check U9 pin12(Mute),pin11( Stby) No Change U9 OK Change M/B ViewSonic Corporation 53 Confidential - Do Not Copy VA912-4_VA912b-4
Display color abnormal: Display color abnormal Check panel cable? No Change panel cable OK Check open/short of U6 No Repair open/short OK Check panel power supply of No Change Q8 OK Check panel No Change panel OK Change M/B ViewSonic Corporation 54 Confidential - Do Not Copy VA912-4_VA912b-4
7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VA912-4) ViewSonic Model Number:VS10867 Serial No. Prefix: PW7 Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Description Accessories: Rev: 1b ECR/ECN ViewSonic P/N Added on 05/31/06 A-PC-0106-0224 Power cable A-00003642 POWER CORD 3P 1.
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 ViewSonic Model Number: VS10867 Rev: 1b Serial No.
ViewSonic Model Number: VS10 Rev: 1b PW8 Serial No.
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EXPLODED PARTS LIST (VA912-4) ViewSonic Model Number: VS10867 Rev: 1b Serial No.
EXPLODED PARTS LIST (VA912b-4) ViewSonic Model Number: VS10867 Rev: 1b Serial No.
Packing for Shipping PACKING PART LIST ( VA912-4 ) ViewSonic Model Number: VS10867 Rev: 1a Item 1 2 3 4 5 6 7 8 9 10 11 ViewSonic P/N N/A N/A P-00004180 N/A A-00003642 N/A M-LB-0813-1042 M-MS-0808-9158 CB-00002602 CB-00004149 C-00004147 Ref. P/N 1L9VAHXVS88 HBL9VA010013 HBL9VA02010 HGL9V01018 DM33T181004 HCL9VA02013 HCL7V019011 HAL7V002019 DDL7VDPC005 DD0L0TPC007 38W0VABS010 Location VA912 monitor END CAP (L) END CAP (R) USER'S MANUAL & CD POWER CORD 3P 1.
ViewSonic Corporation 62 EEPROM 24LC16 Crystal 11.0592MHZ VGA IN DVI IN Digital AG AB INV ON/OFF Volu AC IN Keypad CSZ IRQ RST 24.576MHz Mute CPU MTV312V64 STBY Audio TDA7496L +12V AR HSYNC , VSYNC DDC EEPROM 24LC02 VBRI +2.5V Panel Interface Power Board And Backlight Control Inverter Host Interface Clock Gen. RTD2523 Triple ADC Interface +3.
10. Schematic Diagrams 5DVCC 3 VCC12 2 1 E 2 R10 R6 330/6 1% R8 0/6 10K/6 R13 1K/6 3DVCC 0.1u/6 + 1 + 0/6 3AVCC1 RTD 3DVCC ADC_ 3AVCC C3 EC2 10uF/16V 3DVCC 10uF/16V R175 GND FEB_0805 3DVCC Q3 MMST3906 3DVCC 3DVCC_1 U1 AIC1117CY 3 VIN VOUT 2 VO 4 L32 EC3 C4 0.1u/6 R3 200/6 1% 2 4 6 8 C5 0.1u/6 FUSE1 0 1 EC1 330u/16V R1,L1 12V 1 3 5 7 C1 0.
PAGE1 VGA INPUT L8 FCB1608C-190T03/6 RED+IN R24 DDC_SDA 75/6/F RED-IN 11 13 IN-V 14 RED+IN RED-IN GREEN+IN GREEN-IN BLUE+IN BLUE-IN 1 6 2 7 3 8 4 9 5 10 DDC_SDA 12 IN-H DDC_SCL 15 L9 C16 0.047u/6 R25 100/6 C18 0.047u/6 RED+ RED- FCB1608C-190T03/6 GREEN+IN R26 100/6 C19 0.047u/6 R28 100/6 C21 0.047u/6 C22 0.
3DVCC R3DVCC B+ BSOG G+ GR+ R- BLUE+ BLUESOGIN GREEN+ GREENRED+ RED- B+ BSOG/ADC_TEST G+ 35 G37 R+ 38 R- 30 31 33 34 27 32 39 40 ADC_GND C43.C44.C45盡量靠近IC AHS AVS AHS AVS ADC_GND ADC_GND ADC_GND ADC_GND 42 AHS 43 AVS TCON[11]/V[0] TCON[10]/V[1] TCON[9]/V[2] TCON[8]/V[3] TCON[7]/V[4] TCON[6]/V[5] TCON[5]/V[6] TCON[1]/V[7] TCON[0]/VCLK 28 ADC_REFIO 114 115 116 117 118 119 122 123 124 0.1u/6 DDCSDA DDCSCL DDCSDA2 DDCSCL2 C64 125 126 C63 0.1u/6 C62 0.1u/6 C61 0.1u/6 C59 22uF/16V C60 0.
3DVCC Reset circuit VCPU C 3DVCC R79 R78 R165 NC/100K/6 1 10K/6 Q20 Q12 LED_G R82 4.7K/6 2N3906 2 3DVCC VCPU R106 NC/82K/6 3AVCC1 R147 4.7K/6 R85 33K/6 R84 33K/6 R91 33K/6 3 C86 NC/1U/16V 3AVCC1 2 2N3906 R90 33K/6 4.7K/6 R89 33K/6 R93 LED_R R88 33K/6 3 Q13 R87 33K/6 NC/2N3906 1 2 C103 NC/1U/16V E 1 NC/ 1N4148 B 10K/6 3 D32 CN6 R95 R96 R97 R98 R99 R100 R101 R102 R103 MENU SEL PWR DOWN UP RIGHT LEFT VCPU 10 9 8 7 6 5 4 3 2 1 C81 0.1U/6 C82 0.1U/6 C80 0.
VCC12 R128 1K/6 VOL 10K/6 1U/8 3.9K/6 R130 R131 C89 1 Q15 2 VOLUME 10K/6 SN7002E 3 R129 3 C AGND B 2 1 VCC12 E L24 BEAD/1206 PC AUDIO-IN C91 C90 330U/16V L25 600/CX601T02001 2 Z0415 1 Z0412 L_LINE R132 100/6 C92 LIN_PC 0.47U/8 4 AGND VS 1 5 4 3 2 ZD005D100 VS J3 15 U9 16 0.1U/6 INL OUTL R_LINE 2 Z0416 R133 1 L26 600/CX601T02001 C94 RIN_PC 100/6 0.
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ViewSonic Corporation 69 Confidential - Do Not Copy VA912-4_VA912b-4
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* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation. Assessment A. What do you think about the content of this Service Manual? Unit Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6.