ViewSonic VA702-1 User Manual Download

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ViewSonic VA702-1

VA702b-1

Model No. VS10781

17” Color TFT LCD

Display

(VA702-1_ VA702b-1_SM Rev. 1b Sep. 2006)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Service Manual

Summary of Contents for VA702-1

Page 1: ...ViewSonic VA702 1 VA702b 1 Model No VS10781 17 Color TFT LCD Display VA702 1_ VA702b 1_SM Rev 1b Sep 2006 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 Service Manual...

Page 2: ...respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to...

Page 3: ...y Notices 1 2 Specification 4 3 Front Panel Function Control Description 13 4 Circuit Description 18 5 Adjustment Procedure 29 6 Troubleshooting Flow Chart 35 7 Recommended Spare Parts List 42 8 Explo...

Page 4: ...tor only in a lean cool dry environment If it gets wet unplug the power cable immediately and consult your closed dealer z Always unplug the monitor before cleaning it Clean the cabinet with a clean d...

Page 5: ...ods Incorrect Methods Only touch the metal of the LCD panel or the front cover of he monitor Do not touch the surface of the polarizer Surface of the LCD panel is pressed by fingers and that may cause...

Page 6: ...on a clean and soft foam pad Placing the monitor on foreign objects That could scratch the surface of the panel or cause Mura The panel is placed facedown on the lap That may cause Mura ViewSonic Corp...

Page 7: ...solution 1280x1024 60Hz Analog 75ohms 0 7 1 0 Vp p Yes Input Signal Digital No Separate Sync Yes Composite Sync No Sync Compatibility Sync on Green No PC Yes Power Mac Yes Compatibility TV Box NextVis...

Page 8: ...tor DB 15 Pin out Compliant DDC 1 2B Video Signals Video RGB Analog 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 9: ...Surge Immunity Shall be able to withstand 1 5 times nominal line voltage for one cycle with no damage Power Supply Missing Cycle Immunity Shall be able to function properly without reset or visible s...

Page 10: ...0 x 600 56Hz 35 1kHz Yes 12 800 x 600 60Hz 37 9kHz Yes 13 800 x 600 75Hz 46 9kHz Yes 14 800 x 600 72Hz 48 1kHz Yes 15 800 x 600 85Hz 53 7kHz Yes 16 832 x 624 75Hz 49 7kHz Yes 17 1024 x 768 60Hz 48 4kH...

Page 11: ...ghtness Max 300 cd m2 Typ after 30 minute warm up 250 cd m2 Min after 30 minute warm up Brightness Uniformity 13 points 0 8 Typ 0 75 Min Min Luminance of 13 points Max Luminance of 13 points Contrast...

Page 12: ...nance Center Condition CT 6500K Contrast Max Brightness Max 300 cd m2 Typ after 30 minute warm up 250 cd m2 Min after 30 minute warm up Brightness Uniformity 13 points 0 8 Typ 0 75 Min Min Luminance o...

Page 13: ...p 250 cd m2 Min after 30 minute warm up Brightness Uniformity 13 points 0 8 Typ 0 75 Min Min Luminance of 13 points Max Luminance of 13 points Contrast Ratio 600 1 Typ 400 1 min Color Depth 16 2 milli...

Page 14: ...Preset Full Screen Vertical Display Size Primary Preset Full Screen Saturation Contrast Default Brightness Default Test Pattern 32 Gray No visible saturation Contrast 100 Brightness 100 Test Pattern 3...

Page 15: ...ided by ViewSonic Neck Base and Rear Cover Color The reference for the bezel is the black color VA702 and the midnight gray color VA702b chip provided by ViewSonic The color difference between any two...

Page 16: ...Front Control Panel shown below in detail Scrolls through menu options and adjusts the displayed control Also a shortcut to display the Contrast adjustment control screen Displays the control screen f...

Page 17: ...ents and exit the menu press button 1 twice The following tips may help you optimize your display Adjust the computer s graphics card so that it outputs a 1280 x 1024 60Hz video signal to the LCD disp...

Page 18: ...several color adjustment modes including preset color temperatures and a User Color mode which allows independent adjustment of red R green G and blue B The factory setting for this product is 6500K 6...

Page 19: ...60Hz recommended means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz Manual Image Adjust H V Position Horizontal Vertical Position moves the screen image left or right and up or...

Page 20: ...s OSD Timeout sets the length of time the OSD screen is displayed For example with a 15 second setting if a control is not pushed within 15 seconds the display screen disappears OSD Background allows...

Page 21: ...power will protected when the primary current over about 1 35A When PWM is turned off the main current flow will be consumed through D804 and ZD802 This will prevent MOSFET which built in IC802 from...

Page 22: ...age through D509 R515 C533 and the high level DC voltage reaches the gate pin of Q502 similarly the gate pin of Q503 Q504 Q505 has high level DC voltage So the gate pin of Q501 has a low level voltage...

Page 23: ...and adjustment which is connected to U105 25 through CN106 1 Button Key Up is defined as plus which is connected to U105 26 through CN106 3 Button Key Down is defined as minus which is connected to U...

Page 24: ...ck to U104 and then U104 will do the power on off If Power ON U105 6 LED_Green will send out High potential and then LED green on If Power OFF U105 7 LED_Orange will send out High potential and then L...

Page 25: ...s signal of odd channel 2 LVDS 7 GND Ground 8 RXOC minus signal of odd clock channel LVDS 9 RXOC plus signal of odd clock channel LVDS 10 RXO3 minus signal of odd channel 3 LVDS 11 RXO3 plus signal of...

Page 26: ...LCT I Timing capacitor of set LPWM frequency 7 ADJ I Control command input DC 8 ENA I Enable input 9 VSEN I Voltage sense feedback 10 CMP_SST I Soft start and loop compensation capacitor 11 ISEN I Cur...

Page 27: ...d 45 VDD_ADC I ADC Power 46 NC Not connected 47 NC Not connected 48 GND Ground 49 NC Not connected 50 NC Not connected 51 VDD_ADC I ADC Power 52 REXT External resistor 390 ohm to AVDD ADC 53 AVDD PLL...

Page 28: ...put Power 105 GND Ground 106 LVACKP O A Link Positive LVDS Differential Clock 107 LVACKM O A Link Negative LVDS Differential Clock 108 LVA2P O A Link Positive LVDS Differential Data 109 LVA2M O A Link...

Page 29: ...ite protection control for DVI EDID Prevent E2PROM Write in standard 8052 20 XTAL2 Crystal 22 1184MHz In 21 XTAL1 Crystal 22 1184MHz out 22 GND Sink voltage ground 23 P4 0 A bi directional I O port wi...

Page 30: ...1 BACK COVER SUB ASS Y 1 BEZEL SUB ASSM G S BUTTON FUNCTION KEY 1 LED LENS 1 FRONT BEZEL G S 1 BACK COVER SUB ASS Y SUPPORT VESA 1 PLATE BASE 1 Rubber spacer 1 Logo 1 BACK COVER 1 BRACKET_R 1 GROUND...

Page 31: ...E THREE BRID 1 LOGO PLATE VIEWSONIC 1 BEZEL SUB ASSM G S BACK COVER 1 BACK COVER SUB ASS Y LOGO PLATE ELLIPSE 1 Rubber 1 SUPPORT VESA 1 BRACKET_R 1 GROUND WIRE 1 KEYPAD CABEL 1 KEYPAD ASSM 1 SCREW PW...

Page 32: ...power off the monitor 2 Hot Key Operation CONTROL KEY KEYS FUNCTION Recall Contrast or Brightness while in the Contrast or Brightness adjustment or recall both of Contrast and Brightness when the OSD...

Page 33: ...NOTICE When the OSD is locked will lock all functions Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate OSD Locked OSD Lock should not lock Power Button and Po...

Page 34: ...monitor and in factory mode if no VGA signal input Burn in pattern will self generate automatically Burn in patterns are full Red Green Blue White and Black You can not escape from Burn in pattern un...

Page 35: ...ed Chroma Signal Generator Contrast Check 1 Set input mode to 1280x1024 60Hz 2 Set Pattern to 32 gray shades 3 Set contrast to the max The brightest 5 6 shades brightness cannot be distinguished Chrom...

Page 36: ...anel Flicker check 1 Mode 1280x1024 60Hz 2 Set Brightness contrast to default value 3 Do Auto Image Adjust 4 Shut down PC to check whether there s glitter on the center of the picture Equipment Chroma...

Page 37: ...R G B color is normal or not please do it under 16 grey scalar pattern z This LCM is analog interface So if the entire screen is an abnormal color that means the problem happen in the analog circuit...

Page 38: ...power Check primary rectifier voltage Check IC802 C805 T801 Check circuit if short Check F801 P801 D801 Check pin3 of IC802 voltage about 1V Check R801 R805 R822 R823 R817 Check pin2 of IC802 voltage...

Page 39: ...le Check Vbe of Q801 below 0 3V Check circuit if short Check ZD801 ZD802 ZD803 D803 D805 Check Q801 Q802 Check reference voltage Check pinR of IC801 Check R809 R814 IC801 R818 Check R810 R811 Check fe...

Page 40: ...Circuit Check R810 R811 R818 Change R810 R811 R818 Check the R pin voltage of IC803 about 2 5V Check R809 R808 R814 D809 Check D806 C815 if short Change D806 C815 Check pin1 of IC802 voltage is 5 8V C...

Page 41: ...oment of restart Check CN501 CN502 CN503 and CN504 No raster LED Green Yes Yes Yes Backlight cannot be turned on No Check power supply No Is R526 Ok Check I F board Yes R526 open No Yes No Is Ok IC501...

Page 42: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 39 6 Black Screen and backlight turn on...

Page 43: ...creen Workmanship LVDS Cable Reinsert Change LVDS Cable Check VLCD is 5V Check Panel Enable of U105 pin2 is low LVDS Cable NG Check the HWRESET of U104 exists Check RP101 Check the pins of U105 END OK...

Page 44: ...anship LVDS Cable NG 1 Check X101 C154 C155 2 Check X102 C126 C168 Check ALE RDZ WRZ AD0 AD1 AD2 AD3 HWRESET Check the pins of U104 and U105 LVDS Cable Reinsert Change LVDS Cable Check Crystal pin20 2...

Page 45: ...EL 17 MT170EN01 V7 G2 AM17000057 RoHS Added on 9 11 06 E 00008007 631102071920R 26 LCD PANEL 17 MT170EN01 V7 G3 AM17000057 RoHS Added on 9 11 06 E 00008008 631102071930R 27 SCREW B CROSS T T 4 10 BLK...

Page 46: ...n 9 11 06 E 00008007 631102071920R 25 LCD PANEL 17 MT170EN01 V7 G3 AM17000057 RoHS Added on 9 11 06 E 00008008 631102071930R 26 SCREW B CROSS T T 4 10 BLK ROHS Added on 9 11 06 HW 00005265 50941261050...

Page 47: ...N A 506102000400R LOGO PLATE VIEWSONIC LE1709 THREE BIRDS For VSI 1 34 N A 506102000500R LOGO PLATE VIEWSONIC LE1709 ELLIPSE For VSI 1 35 P 00005272 506120300400R BAG PE EPE L590xW480xT0 6mm PRINTED L...

Page 48: ...02000400R LOGO PLATE VIEWSONIC LE1709 THREE BIRDS For VSI VSA 1 34 N A 506102000500R LOGO PLATE VIEWSONIC LE1709 ELLIPSE For VSI VSA 1 35 P 00005272 506120300400R BAG PE EPE L590xW480xT0 6mm PRINTED L...

Page 49: ...poration Confidential Do Not Copy VA702 1_VA702b 1 46 Model Title Date Rev ViewSonic Corporation E E F F A A A A B D C E B B B C C C D D D D D D D E D C Exploded diagram 8 Exploded Diagram and Explode...

Page 50: ...00 SCREW P CROSS M5 22 Ni Hinge Base ASM 4 23 M 00003171 509000000700 BOLT 4 40x11 8 NiFOR D SUB DVI CONN D SUB 2 EXPLODED PARTS LIST VA702 1 ViewSonic Model Number VS10781 Rev 1a Item ViewSonic P N R...

Page 51: ...Lamp3 Keypad Connector VGA Input VGA Connector Scaler TSU16AK AC Line Filter AC Socket TFT LCD Panel 17 MT170EN01 Innolux Feedback OVP LTV817 Power Transformer MCU W78E65p Power Transformer2 Lamp1 Lam...

Page 52: ...806 2200P Y2 C820 2200P Y1 SRF5 04 F801 2A 250V C817 0 1u 50V CN801 08DA 6S 1 2 3 4 5 6 IC802 TOP246Y 1 2 3 4 5 6 C L X S F D IC801 LTV817 3 1 4 2 R810 5K1 1 R801 3M3 R822 3M3 R828 100R 1W R829 200R 1...

Page 53: ...1 12 13 14 15 16 NDRV2 PGND NDRV1 GNDA CT LCT DIM ENA VSEN CMP_SST ISEN V5000 VIN HSB PDRV1 PDRV2 C511 2 2uF 25V C508 22n 25V CN504 H L R528 182K 1 C532 0 1u 50V C527 5P 3KV 5V R519 1M 560 C524 10P 3K...

Page 54: ...101 100uF 16V C107 0 1 50V CN101 4500 06 1 2 3 4 5 6 VLCD R105 4K7 R157 4K7 R174 9 1R 2W VCC5V CCFL_ENABLE VAA1 Q101 AP2301N G D S R106 10K VCC3 3 VCC5V U101 FS8860 18PJ 3 1 2 VIN ADJ VOUT C110 0 1 50...

Page 55: ...470 TVS104 5V6 SOG R120 2K2 VSI R124 10K C122 47n 25V C166 NC C115 47n 25V D104 SN4148 R121 47 R110 100 R165 0 GNDR C167 NC R113 75 1 TVS105 5V6 R114 10K PC5V_VGA R107 100 R108 1K CN102 DZ11AA1 HW6 1...

Page 56: ...NDP GNDP GNDP GNDC GNDC GNDC GNDP GNDC XIN XOUT LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M NC LVB3P NC LVB3M NC LVBCKP NC LVBCKM NC LVB2P NC LVB2M NC LVB1P NC LVB1M NC LVB0P NC LVB0M DDC1_CLK GPO8 DDC1_DAT G...

Page 57: ...1 PB0 RXO0 RXO1 RXO2 RXO1 RXE2 RXO3 RXO3 PA5 PA 0 9 PB6 RXEC RXE2 RXOC RXOC RXEC RXO2 RXEC RXE0 PA9 RXOC VLCD RXE1 VLCD RXO2 PB1 RXO2 RXO3 RXE1 RXOC RXO0 RXE1 RXO0 RXE3 PA0 PA1 PA3 RXE0 RXO1 CN104 DUP...

Page 58: ...41 42 43 44 10 31 15 18 12 19 8 9 23 33 34 P4 2 P1 0 P1 1 P1 2 P1 3 P1 4 P1 5 X2 X1 VSS P2 0 P2 1 P2 2 P2 3 P2 4 P2 5 P2 6 PSEN EA P0 7 P0 6 P0 5 P0 4 P0 3 P3 0 RXD P3 1 TXD P3 2 INT0 P3 4 T0 P3 5 T1...

Page 59: ...el Title Date Rev ViewSonic Corporation KEYPAD SW105 SW TACT SW103 SW TACT ORANGE KEY_POWER UP POWER CN106 2x4PIN 1 2 4 5 6 7 8 3 KEY_MENU EXIT LED101 GREEN KEY_SELECT AUTO LED_GREEN MENU 1 SW101 SW T...

Page 60: ...11 PCB Layout Diagrams Main board Top layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 57...

Page 61: ...Main board bottom Layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 58...

Page 62: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 59 POWER board...

Page 63: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 60...

Page 64: ...Circuit Description 5 Adjustment Procedure 6 Troubleshooting Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Exploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout...

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