Service Manual ViewSonic VA702-3 VA702b-3 Model No. VLCDS27998-3W VLCDS27998-4W 17” Color TFT LCD Display (VA702-3_VA702b-3_SM Rev.
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 3 3. Front Panel Function Control Description 7 4. Circuit Description 9 5. Adjustment Procedure 17 6. Troubleshooting Flow Chart 40 7. Recommended Spare Parts List 42 8. Exploded Diagram and Exploded Parts List 45 9. Block Diagram 49 10. Schematic Diagrams 51 11.
1. Precautions and Safety Notices 1. Caution : No modification of any circuit should be attempted . Service work should only be performed after you are thoroughly familiar with all of the following safety checks and servicing guide line 2. Safety Check : Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These voltage are exposed in such areas as the associated transformer circuits . 3.
Handling & Placing method Correct methods : Only touch the metal-frame of the panel or the front cover of the monitor .Do not touch the surface of the polarizer . Incorrect Methods : Surface of the panel is pressed by fingers & this may cause “ MURA “ Take out the monitor with cushion Take out the monitor by grasping the LCD panel. That may cause “ MURA“. Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .
2. Specification GENERAL REQUIREMENTS General Specifications Test Resolution & Frequency 1280 x 1024 @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default: Contrast = 70%, Brightness = 100% SIGNAL INTERFACE Video Interface Analog Input Connector DB-15 (Analog) Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes. Video Cable Connector DB-15 Pinout Compliant DDC 2B.
ELECTRICAL REQUIREMENTS Horizontal / Vertical Frequency Horizontal Frequency 30 – 80 kHz Vertical Refresh Rate 50 –85 Hz. Maximum Pixel Clock 135 MHz Sync Polarity Independent of sync polarity. Primary Presets Primary Preset 1280 x 1024 @ 60Hz Look up table timing <> 640 x 350 @ 70Hz, 31.5kHz 640 x 480 @ 60Hz, 31.5kHz 640 x 480 @ 67Hz, 35.0kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 800 x 600 @ 56Hz, 35.
LCD Panel 1st Source Panel QD17EL0711 Type NORMALLY WHITE, TN, OPTICAL COMPENSATION FILM Active Size 337.920 (H) x 270.336 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.
ENVIRONMENTAL Environmental Conditions Operating Temperature 0°C to +40°C Storage Temperature -20°C to +60°C Operating Relative Humidity 20% to 90% RH Non-Condensing Storage Relative Humidity 5% to 90% RH Non-Condensing Operating Altitude 0 to +3,000 meters Storage Altitude 0 to +12,000 meters ViewSonic Corporation Confidential - Do Not Copy 6 VA702-3_VA702b-3
3. Front Panel Function Control Description Main Menu With On View controls Front Control Panel shown below in detail Displays the control screen for the highlighted control. Also toggles between two controls on some screens. Also a shortcut to auto image adjust Displays the Main Menu or exits the control screen and saves adjustments. Power light Green = ON Orange=power saving Scrolls through menu options and adjusts the displayed control.
ViewSonic VE702/b -3 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 , LED, Button"2" , Up arrow- button , Down arrow button , Button"1" , button , Down arrow button , Button"1" , on the front panel. 1.2 Video signal connector, and AC-IN are located on the back side of the cabinet. 1.3 OSD menu includes the following function; AUTO IMAGE ADJUST CONTRAST / BRIGHTNESS COLOR ADJUST INFORMATION MANUAL IMAGE ADJUST SETUP MENU MEMORY RECALL 1.4 CONTRAST and BRIGHTNESS can be directly controlled with UP / DN key. . 2.
3. ELECTRICAL SPECIFICATIONS 3.1 Standard conditions Display Area 338 x 270 mm Video Signal 0.7 Vpp Contrast 70% Brightness Max. Ambient 20 +/- 5 ° C Input AC Warming up > 30 min Display 1280 x 1024 3.2 POWER 3.2.1 Power supply Input Voltage 90 -240 ~Volts Power Frequency 50/ 60 Hz +/-3Hz Input current <1.5Arms @ 90Vac <0.75Arms@240Vac 3.2.2 Inrush current 90A(max.) at 230Vac Power consumption 50Watt Output Voltage @0-3.
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(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 ______________________________________________________________________ (54-71) Detailed Timing / Descriptor Block 1: 1280x1024 Pixel Clock: 108.
VA702b-3 Time: 15:33:23 Date: Wed Oct 19, 2005 ______________________________________________________________________ ______________________________________________________________________ VIEWSONIC CORPORATION EDID Version # 1, Revision # 3 DDCTest For: ViewSonic VA702-3SERIES ______________________________________________________________________ ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: 0 1 2 3 4 5 6 7 8 9 _____________________
1152 X 864 @75Hz 1024 X 768 @85Hz 800 X 600 @85Hz 640 X 480 @85Hz Not Used Not Used ______________________________________________________________________ (54-71) Detailed Timing / Descriptor Block 1: 1280x1024 Pixel Clock: 108.
14.318 MHz crystal is recommended. b) Analog to Digital Converter: The MST8111A chip has three ADC's (analog-to-digital converters), one for each color (red, green and blue) .The analog RGB signals are connected to MST8111A as described below Pin Name Pin Number Red + 63 Red - 62 Green + 60 Green - 59 Blue + 58 Blue - 57 c) OSD : The MST8111A has a fully programmable ,high-quality OSD controller. The on-chip static RAM(4096 words by 24 bits) stores the cell map and the cell definitions.
Oscillator with an active current sense circuit. Desired output voltage are determined by the equation, Volt = 1.25 ( 1 + R67 / R66), In this case, the output voltage are 3.3 Volts The AIC1739 is a low dropout positive adjustable regulator with minimum of 300mA output current capability. So it is well suited for 3.3 V and 2.5 V Regulator. 6.1.3 Power Regulator MC34063A (U7) : The MC34063A is a monolithic control IC containing the primary functions required for DC to DC converters.
5. Adjustment Procedure OSD Function Menu 1. Main Menu Press “1” Button (Menu Button) to enter Main Menu: Press Up Button to the previous page or Down Botton to the next page . Press “1” Button to exit Main Menu. (1) Auto Image Adjust Page: Press “2” Button to do auto image adjust function. Press “1” Button to exit the page. (2) Contrast/Brightnes Page: Press “2” Button to enter Contrast Item. Press “1” Button to exit the page. 1) Contrast Item Press Up Button to make contrast high.
Press Down Button to make current option low. (4) Information Page: Press “2” Button to show the information. Press “1” Button to exit Information page. (5) Manual Image Adjust Page: Press “2” Button to enter Manual Image Adjust page. Press “1” Button to exit Manual Image Adjust page. Press Up Button to the previous item or Down Botton to the next item. 1) H./V. Position Item Press “2” Button to enter H./V. Position item. Press “1” Button to exit H./V. Position item.
Press Down Button to make current item low. (6) Setup Menu Page: Press “2” Button to enter Setup Menu page. Press “1” Button to exit Setup Menu page. Press Up Button to the previous item or Down Botton to the next item. 1) Language Select Item Press “2” Button to enter Language Select item. Press “1” Button to exit Language Select item. Press Up Button to the previous option or Down Botton to the next option. English,French… … ..Option Press “2” Button to select the language.
Press “1” Button to exit OSD Time Out item. Press Up Button to make OSD time out long. Press Down Button to make OSD time out short. 5) OSD Background Item Press “2” Button to enter OSD Background item. Press “1” Button to exit OSD Background item. Enable,Disable Option Press “2” Button to select the option. Press “1” Button to exit the option. Press Up Button to the previous option or Down Botton to the next option. (7) Memory Recall Page Press “2” Button to do the memory recall function.
Function test (1) Test equipment Color video Signal & pattern generator (or PC with SXGV resolution ) (2) Test condition Warm-up at least 30mins is necessary under following condition 2. 1. room temperature 2. With full-white screen , RGB , black pattern 3. with cycled display modes. before function test & alignment : Test display modes Item Timing Analog 1 640 x 350 @ 70Hz, 31.5kHz Yes 2 640 x 400 @ 60Hz, 31.5kHz Yes 3 640 x 400 @ 70Hz, 31.5kHz Yes 4 640 x 480 @ 50Hz, 24.
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Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 ViewSonic Corporation Confidential - Do Not Copy 23 VA702-3_VA702b-3
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.
Appendix A : How to install the software for ISP : ViewSonic Corporation Confidential - Do Not Copy 25 VA702-3_VA702b-3
1. Install ISP 1.1 User could download ISP river and PORT95NT install from Myson Century website (www.myson.com.tw) 1.2 After extracting the ZIP file , the total files list as Fig 1.2 , and double click the file of setup.exe to install. 1.3 Press “ Next “ button to continue., see 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 1.4 . 1.5 Press “ Install “ button to continue , see Fig 1.
1.6 The installer Information shows package warning , Press “ Ignore “ button to continue .see Fig 1.6 . 1.7 Installation has finished , press “ Finish “ button , see Fig 1.7 . Fig. 1.
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 . 2.2 Security file is a key to use ISP function , press “ 確定 “ button , see 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 “ 確定 “ button , see Fig 2.3 . 2.4 Press “ Create Security File “ button to key in Security code. Adjusting bar to decrease speed of IIC bus , See Fig.
2.7 Fig 2.7 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 .
3. 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 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 flash .
4. Use ISP to read MCU content 4.1 Only software ISP could read the MCU content , it is according to program the boot code while coding . The limitation is used for the security of customer’s code. Select “ Read Target “ item , and press “RUN” button , the MCU content will show as Fig4.
5 Re-entry the ISP Mode When you couldn’t select or click “ Reset MCU “ button and enter ISP mode again , you’ll see the message as below : ViewSonic Corporation Confidential - Do Not Copy 34 VA702-3_VA702b-3
Note : (1) Disable the “ Enter ISP Mode ” option to avoid the error message display (2) If you using the MTV312M64 or before MCU serials , the MCU will always in “ ISP Mode “ even Programming fail or erase MCU that instead of select or press “ Reset MCU “ ViewSonic Corporation Confidential - Do Not Copy 35 VA702-3_VA702b-3
Packing procedure 1.1 Paste protection film to protect the monitor (Figure.1) 1.2 Put the monitor in PE bag & seal the with tape . (Figure.2) Figure.1 Figure.2 1.3 Put the cushion on the monitor (Figure.3) 1.4 Put the monitor into carton & put all the accessories into the carton .Then close the carton . (Figure.
Disassemble monitor 2.1 Take off the hinge caps (Figure 5) 2.2 Lay VA702/b-3 down & take off the screws to remove the base (Figure 6) (Figure 5) 2.3 Remove the screw cover (Figure 7) 2.4 Take of the screws (Figure 8) (Figure 6) Figure 7 2.5 Remove the back cover (Figure 9) 2.
2.7 Take off the screws on the B/B (Figure 11) 2.8 Remove the B/B from the front-bezel (Figure 12) Figure 11 2.9 Figure 12 Tear off the AL-foil , all cables on M/B & lamp wires . (Figure 13) 2.10 Take off the screws on the PCB holder & remove the PCB holder with the boards . (Figure 14) Figure 13 Figure 14 2.11 Take out the screws on M/B & remove the cable between M/B & power board (Figure 15) 2.
2.13 Put the PCB holder up-side-down & remove the screws on the power board (Figure 17) 2.14 Remove the power board (Figure 18) Figure 17 Figure 18 2.15 Separate the bezel & panel (with BKT) & remove the cable on panel (Figure 19) 2.16 Take off the L/R BKT & remove the L/R BKT .
6. Troubleshooting Flow Chart 1.
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7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VA702-3) ViewSonic Model Number: VLCDS27998-3W Serial No. Prefix: Q5K Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Rev: 1a Description ECR/ECN POWER CORD SP-305+IS-14 3P 1.
BOM LIST (VA702-3) ViewSonic Model Number: VLCDS27998-3W Rev: 1a Serial No.
BOM LIST (VA702b-3) ViewSonic Model Number: VLCDS27998-4W Rev: 1a Serial No.
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EXPLODED PARTS LIST (VA702-3) ViewSonic Model Number: VLCDS27998-3W Rev: 1a Serial No.
EXPLODED PARTS LIST (VA702b-3) ViewSonic Model Number: VLCDS27998-4W Rev: 1a Serial No.
PACKING PART LIST ( VA702-3 / VA702b-3 ) ViewSonic Model Number: VLCDS27998-3W/4W Rev: 1a Item 1 2 3 4 5 6 7 8 ViewSonic Corporation Confidential - Do Not Copy 48 VA702-3_VA702b-3 ViewSonic P/N N/A P-FM-0602-0840 P-FM-0602-0841 DC-00005789 A-00005252 N/A N/A M-MS-0808-7710 Ref. P/N 1L7VCAXVS12 HBL7V005019 HBL7V006015 HGL7VC07010 DM333181G97 HFL7VC05016 HCL9V008014 HAL7E002013 Location VA702b-3 END CAP (L) END CAP (R) QSG+CD POWER CORD 3P 1.
ViewSonic Corporation 49 Confidential - Do Not Copy Crystal 11.0592MHz ISP EEPROM 24C08 14.318MHz Crystal Analog RGB DDC-SDA DDC-SCL CPU MTV312V64 Keypad CSZ IRQ RST SCL/SDA AR , AG, AB HSYNC / VSYNC Interface Host Clock Gen. Brightness Control Panel Interface Interface Panel MST8111A Interface Triple ADC 5V 12V ON/OFF Switch Si2301DS CLK+ / CLK- LVDS2+ / LVDS2- LVDS1+ / LVDS1- Power Board Backlight Control Inverter 17” Panel Backlight 9. Block Diagram 1.
2. Power 12V 12V 5V MC34063 AIC1739 2.5V 3.
10. Schematic Diagrams +3.3V+2.5V LVDS SCALAR MST8111A PC VGA ANALOG RGB POWER EEPROM 24LC16 LCDVCC LCDPWR_ON5.0V +3.3V +3.3V AUDIO_MUTE AUDIO_VOLUME BRIGHTNESS INVCTRL MICRO-CONTROLLER MTV312 DDC AC 100-240Vac QDI LCD PANEL(17 LVDS) +5.0V POWER INVERTER AND AUDIO BOARD +12V 34063 34063 +3.3V +5.0V AIC1739 +2.
VGA_SDA_O L1 11 13 IN-V 14 1 6 2 7 3 8 4 9 5 10 DDC-SCL 15 GND RED-IN GREEN-IN BLUE-IN IN-H VGA_CON_O VGA_SCL_O DSUB_5V_O VGA_CON_O 17 VGA/NC + + + + + + + L35 RED+IN RED-IN GREEN+IN GREEN-IN BLUE+IN BLUE-IN 0/6 L36 100/6/NC VGA_SCL_O L5 CN2 1 3 5 7 9 11 13 FCM 1608C-300T06 (BULL WILL) R2 3 DDC-SDA 12 IN-H L2 RED+IN SDA-VGA 5 16 CN1 100/6 + + + + + + + 2 1 RED-IN SOT23 L3 VGA_CON 5 100/6 NC FCM 1608C-300T06 (BULL WILL) R5 GREEN-IN 75/6/F C5 NC RED+IN GREEN+IN BLUE
VAD VPLLVDVI VDPLL VPO VDD 63 62 60 59 61 58 57 37 38 29 28 RED+ REDGREEN+ GREENSOGIN BLUE+ BLUEHSYNC VSYNC 3 3 3 3 3 3 3 3 TX2+ TX2TX1+ TX1TX0+ TX0TXC+ TXC- R27 VDVI 390/1% 40 41 43 44 46 47 49 50 52 18 87 97 117 R+ RG+ GB+ BCK+ CKREXT L8 VPO CX601T02001/8 VDDC VDDC VDDC VDDC 11 21 84 94 104 114 126 VDDP VDDP VDDP VDDP VDDP VDDP VDDP 53 45 51 RIN0 RIN0M GIN0 GIN0M SOGIN0 BIN0 BIN0M HSYNC0 VSYNC0 DDC1_CLK/GPO8 DDC1_DAT/GPO7 AVDD_PLL 3 3 3 3 3 3 3 3 3 AVDD_DVI AVDD_DVI 35 AVDD AVDD
X1 VSS LED_R LED_G R61 0/6 2 TIMING 3 5 CII GND 4 MC34063 PW0005 R66 3.6K/F/6 1K/6 R68 1 1 1 1 1 1 2 2 2 2 2 2 2 L21 C95 C94 C93 C92 C82 1C47 0.1U/6/NC 0.1U/6/NC 0.1U/6 0.1U/6 0.1U/6 0.1U/6 2 0.1U/6 2 R90 10K/6 GND 47UH DSUB_5V VDD3V3 CPU R67 C60 2.2K/F/6 470P/6 2 10K/6 GND PW0007 C61 C62 C63 0.1U/6 330U/16V 330U/16V/NC MMST3906 R111 1 R91 GND GND R114 3.3/6 Q11 INVCTRL GND 1 VCC EC10QS04 2 1 2 6 D26 PW0006 GND PC5V_OFF D30 3.
LCDVDD 3 R103 R104 0.1U/6/NC 1 R74 C76 Q8 1 D 82K/6 2200P/6 C78 C79 0.1U/6 330U/16V 4 LVACKM GND LCDVCC 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 BR1N BR0N LVB2P GND BCLKN FCLKP FB0P GND FB1P FB2P LVACKP FG0P POL LCDVCC LCDVCC G2 Q9 LVACKP 4 R82 1.2K/F/6/NC 1 S GND 2 E R81 3.
1 3 8 7 6 5 4 3 2 1 SW5 2 4 5 HDK632A 1 3 CN1 4500-10-8P-R 1 3 SW4 2 4 5 HDK632A SW3 2 4 5 HDK632A A2 green 1 3 C LED1 EL-209-2EGW A1 SW2 2 4 5 HDK632A orange 1 3 SW1 2 4 HDK632A CN1 LED1 SW5 SW4 SW3 SW2 SW1 ViewSonic Corporation Model BUTTON-BOARD Title Date ViewSonic Corporation Confidential - Do Not Copy 56 VA702-3_VA702b-3 Rev:
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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.
