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ViewSonic Corporation

 

 

Confidential - Do Not Copy

 

 

18 

+5V is from the power board and supply for U101(FS8860-18PJ)

､

U102(FS8860-33PJ)

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U105(MCU:W78E65P) and panel. +3.3V output is generated from +5V through C169 and C102 

filtering, and U102 outputs. +3.3V is used for U104 (Scaler: TSU16AK). +1.8V output is generated 

from +5V through C169, C105 and C102 filtering, and U101 outputs. +1.8V is also used for U104. 

4.3.2MCU (W78E65P) 

VDD is +5V and its frequency of XTAL1 is 22.1184MHz. U105 #2 is defined as panel-enable. 

When the I/O port is low, Q101 and Q102 are conducted. And then after C109 and C110 filtering, 

obtain the voltage of VLCD, which will be connected to CN103. U105 #3 is defined as 

CCFL-enable. When the I/O port is low, Q103 is pulled up and the backlights are on; When the I/O 

port is high, Q103 is conducted and the backlights are off. U105 #4 is defined as DET-VGA, 

connected with CN102 #5. U105 #14, #36, #37, #38, #39, #40, #41, #42, #43 are the 

communications with U104 (Scaler), which are connected to #72, #31, #78, #77, #30, #70, #71, 

#69, #32 of Scaler. U105 #43 outputs reset signal to U104 (Scaler). 

U106 is EEPROM used for saving EDID data, which is connected by SCL and SDA pins with #16 

and #17 of MCU. Connect #12 to #26 of U105 for ISP. 

4.3.3Scaler (TSU16AK) 

The frequency of XTAL2 is 14.318MHz. U104 #1, #102-#103, #106-#113, #118-#125, #128 output 

LVDS digital data of 8 bit to panel control circuit through CN103. U104 #73 generates a PWM 

waveform by regulating the duty to control the brightness of the backlights. U104 #30-#32, 

#69-#72, #77-#78 are the communications with U105 (MCU) that are connected to #36-#43 of 

MCU. These communications include HWRESET, CSZ/ALE, SCL/RDZ, SDA/WRZ, and 

AD0-AD3. 

4.3.4VGA Input 

Signal R, G, B, SOG input through CN102 #1, #2, #3, and C115, C116, C117 and C118 filtering the 

high frequency noise. Signal HSYNC and VSYNC input through CN102 #13 and #14, and C119, 

R119, C120, R120 filtering. Then the analog signal enters U104, and then U104 deals with it 

internally. In addition, TVS101, TVS102, TVS103 (the three are BAV99), TVS104, TVS105, 

TVS106, TVS107 (they are constant voltage diode of 5V6) are ESD protector. Signal DDC-SCL 

inputs via CN102 #15, and then passes through TVS107 for ESD protection, goes into EDID 

EEPROM IC U103. Signal DDC-SDA inputs via CN102 #12, and then passes through TVS106 for 

ESD protection, goes into EDID EEPROM IC U103. CN102 #5 is defined as cable detect pin, this 

detector realizes via R107 and U105 #4. The PC-5V of U103 is supplied by PC via CN103 #9 with 

D103 for ESD protection, or supplied by Monitor self via D104.U103 is an EEPROM IC, which is a 

kind of memory and used for saving EDID data. 

4.3.5Button Control 

Button “Key-Power” is defined as power on/off, which is connected to U105 #24 through CN106 

#4. 

Button “Key-2” is defined as two functions of selecting 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 U105 #27 through CN106 #5. 

Button “Key-1” is defined as two functions of menu and exit, which is connected to U105 #28 

VA702-2_VA721-3_VA721b-3

 

Summary of Contents for VA702-2

Page 1: ...wSonic VA702 2 VA721 3 VA721b 3 Model No VS10781 17 Color TFT LCD Display VA702 2_VA721 3_VA721b 3_SM Rev 1b Sep 2006 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 Service Manual ...

Page 2: ...y disclaims any warranty of merchantability or fitness for any particular 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 such revision or changes Trademarks Optiquest is a registered trademark of ViewSonic Corporation ViewSonic is a registered trademark of V...

Page 3: ...Safety Notices 1 2 Specification 4 3 Front Panel Function Control Description 13 4 Circuit Description 17 5 Adjustment Procedure 27 6 Troubleshooting Flow Chart 33 7 Recommended Spare Parts List 40 8 Exploded Diagram and Exploded Parts List 46 9 Block Diagram 50 10 Schematic Diagrams 51 11 PCB Layout Diagrams 59 ...

Page 4: ...ol dry environment If it gets wet unplug the power cable immediately and consult your closed dealer lAlways unplug the monitor before cleaning it Clean the cabinet with a clean dry cloth Apply non ammonia based cleaner onto the cloth not directly onto the glass screen lDo not place heavy objects on the monitor or power cord PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis...

Page 5: ...Methods 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 Mura Take out the monitor with cushions Taking out the monitor by grasping the LCD panel That may cause Mura ...

Page 6: ...2_VA721 3_VA721b 3 Correct Methods Incorrect Methods Place the monitor 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 ...

Page 7: ...urce TFTLCD PANEL Recommend resolution 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 NextVision 6 Yes Power Voltage AC 100 240V 50 60Hz Yes On Mode Max Typ 36 W 35 W Power Consumption Off Mode Max 1 W Audio No Tilt 20 5 Yes Swivel No Pivot No Ergonomics Height A...

Page 8: ...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 NextVision 6 Yes Power Voltage AC 100 240V 50 60Hz Yes On Mode Max Typ 36 W 35 W Power Consumption Off Mode Max 1 W Audio No Tilt 20 5 Yes Swivel No Pivot No Ergonomics Height Adjust No OSD Control 1 2 Yes Physical W...

Page 9: ...Output can be shorted without damage Over Current Protection 2 4 A typical at 14 2 VDC Leakage Current 3 5mA Max at 254VAC 60Hz Efficiency 80 typical at 115VAC Full Load Fuse Internal and not user replaceable Power Dissipation 36w max 35 Watts typ Max Input AC Current 0 8 Arms 90VAC 0 4 Arms 265VAC INRUSH CURRENT COLD START 30 A 120VAC 50 A max 220VAC Power Supply Cold Start Shall start and functi...

Page 10: ...al Refresh Rate 50 85 Hz When the resolution is set to 1280 x 1024 the vertical refresh rate may be up to 75 Hz for all other resolutions the vertical refresh rate may be up to 85Hz Maximum Pixel Clock 140 MHz Sync Polarity Independent of sync polarity Timing Table 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 7kHz Yes...

Page 11: ...1st Source Panel Model number Innolux MT170EN01 V2 Type TN type with LVDS interface Active Size 337 9 H x 270 3 V Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0 264 mm GLASS TREATMENT Anti Glare Hard coating 3H OF BACKLIGHTS 4 CCFL edge light 2 top 2 bottom BACKLIGHT LIFE 40 000 Hours Min 50 000 Typ Luminance Center Condition CT 6500K Contrast Max Brightness Max 300 cd m2 Typ after 30 minute ...

Page 12: ...al 155º Minimum 135º Response Time 10 90 Ta 25 C 8 ms Tr 2 ms Tf 6 ms typ 18 ms Tr 7 ms Tf 11 ms max Panel Defects Please see Panel Quality Specifications 3rd Source Panel Model number Innolux MT170EN01 V7 Type TN type with LVDS interface Active Size 337 9 H x 270 3 V Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0 264 mm GLASS TREATMENT Anti Glare Hard coating 3H OF BACKLIGHTS 4 CCFL edge lig...

Page 13: ...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 δ Min Luminance of 13 points Max Luminance of 13 points Contrast Ratio 500 1 Typ 400 1 min Color Depth 16 2 million colors 6 bits 2 bits FRC Viewing Angle Horizontal CR 10 Typical 150º Minimum 130º CR 5 Typical 170º Minimum 150º VIEWING ANGL...

Page 14: ...enter Condition CT 6500K Contrast Max Brightness Max 280 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 δ Min Luminance of 13 points Max Luminance of 13 points Contrast Ratio 600 1 Typ 500 1 min Color Depth 16 2 million colors 6 bits 2 bits FRC Viewing Angle Horizontal CR 10 Typical 150º Minimum 130º CR 5 Typical 170º Minimu...

Page 15: ...s the silver color VA702 and the midnight gray color VA702b chip provided 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 cabinet components shall be less than 0 80 Delta E in the 1976 CIE L a b Color space Rear logo color The rear logo is silver color...

Page 16: ...U 1 By pressing MENU key Main menu display A When MENU OSD display press these keys to change the contents of an adjustment item or change an adjustment value B When MENU OSD is un display press these keys to change brightness and contrast POWER Power on or power off the monitor 2 Hot Key Operation CONTROL KEY KEYS FUNCTION Recall Contrast or Brightness while in the Contrast or Brightness adjustme...

Page 17: ...enu OSD Background On Off Memory Recall 3 2 OSD lock Menu function VA702 2_VA721 3_VA721b 3 OSD Lock Menu Function Check Item Method Phenomenon Activate OSD lock 1 10S Press any of buttons 1 2 will appear OSD Locked 3s Deactivate OSD lock 1 10S again 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 ...

Page 18: ...Notice Menu Item Method Phenomenon Activate Resolution Notice Menu Resolution Notice OSD should show on screen after changing to non native mode for 30 sec And it should disappear after 10s or by pushing button 1 or 2 Deactivate Resolution Notice Menu Push button 2 under Resolution Notice OSD select Disable 3 5 Factory Mode Introduction When input the signal press power key to turn off the monitor...

Page 19: ...ntrol circuitry Resistor R803 R807 R824 and R825 are for line over voltage shut down OVP and line under voltage detection UVP Resistors R801 R805 R822 and R823 are for external current limit adjustment and used to reduce the current limit externally to a value close to the operating peak current of primary about 1 35A The mean is power will protected when the primary current over about 1 35A When ...

Page 20: ...espectively generate a square pulses to drive MOSFET U501 U502 And U501 U502 works as full bridge topology it is high efficient zero voltage switch During start up VSEN pin9 detects the voltage at the transformer secondary When VSEN reaches 3 0V the output voltage is regulated If no current is detected for around 1 5 seconds IC501 will shut down The current flowing through CCFL is detected and reg...

Page 21: ...ghtness of the backlights U104 30 32 69 72 77 78 are the communications with U105 MCU that are connected to 36 43 of MCU These communications include HWRESET CSZ ALE SCL RDZ SDA WRZ and AD0 AD3 4 3 4VGA Input Signal R G B SOG input through CN102 1 2 3 and C115 C116 C117 and C118 filtering the high frequency noise Signal HSYNC and VSYNC input through CN102 13 and 14 and C119 R119 C120 R120 filterin...

Page 22: ...MHz 1 640 x 350 31 5kHz 70Hz 25 2 2 640 x 400 31 5kHz 60Hz 25 2 3 640 x 400 31 5kHz 70Hz 25 2 4 24 7kHz 50Hz 19 8 5 31 5kHz 60Hz 25 2 6 35 0kHz 67Hz 30 2 7 37 9kHz 72Hz 31 5 8 37 5kHz 75Hz 31 5 9 640 x 480 43 27kHz 85Hz 36 0 10 720 x 400 31 5kHz 70Hz 28 3 11 35 1kHz 56Hz 36 0 12 37 9kHz 60Hz 40 0 13 48 1kHz 72Hz 50 0 14 46 9kHz 75Hz 49 5 15 800 x 600 53 7kHz 85Hz 56 3 16 832 x 624 49 7kHz 75Hz 57 ...

Page 23: ...re power on has been completed 2 Software Power ON OFF When press power key U105 24 recieves low pulse and sends out Power on off order back 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 LED Orange on The Panel_Vcc Backlight_En CLK DATA output to pan...

Page 24: ...KEY_POWER DC power on off control 5 KEY_DOWN OSD control to adjust value to decrease 6 LED_GREEN Green LED lighting control 7 GND Ground 8 LED_ORANGE Orange LED lighting control 6 4 CN103 Connect I F BD to panel FI X30S H or Equivalent Pin No Symbol Function 1 RXO0 minus signal of odd channel 0 LVDS 2 RXO0 plus signal of odd channel 0 LVDS 3 RXO1 minus signal of odd channel 1 LVDS 4 RXO1 plus sign...

Page 25: ...ly 5 0 V 29 VCC Power supply 5 0 V 30 VCC Power supply 5 0 V 6 5 CN102 D SUB Connector Pin Symbol Pin Symbol Pin Symbol 1 Red video input 6 Red GND 11 NC 2 Green video input 7 Green GND 12 Serial data SDA 3 Blue video input 8 Blue GND 13 H H V SYNC 4 NC 9 5V from PC 14 VSYNC 5 Cable Detect 10 GND 15 Data clock line SCL 7 Key Parts Pin Assignment 7 1 IC802 TOP246Y Power Control IC Pin Symbol I O De...

Page 26: ...ard converter 7 3 U104 TSU16AK Pin Symbol I O Description 1 LVBOM O B Link Negative LVDS Differential Data Output 2 GND Ground 3 BYPASS For External Bypass Capacitor 4 NC Not connected 5 NC Not connected 6 BUSTYPE IN Low Serial bus High Direct bus 7 NC Not connected 8 NC Not connected 9 NC Not connected 10 GND Ground 11 VDDP O Digital Output Power 12 NC Not connected 13 NC Not connected 14 NC Not ...

Page 27: ... I Analog green input 61 SOGIN0 I Sync on green input 62 RINOM I Reference ground for analog red input 63 RINO I Analog red input 64 GND Ground 65 AVDD_ADC I ADC Power 66 REFP Internal ADC top de coupling pin 67 REFM Internal ADC bottom de coupling pin 68 GND Ground 69 ALE CS I DDR direct bus ALE active high 70 WRZ SDA I O DDR direct bus WRZ active low 71 RDZ SCL I DDR direct bus RDZ active low 72...

Page 28: ...LVDS Differential Clock Output 121 LVBCKM O B Link Negative LVDS Differential Clock Output 122 LVB2P O B Link Positive LVDS Differential Data Output 123 LVB2M O B Link Negative LVDS Differential Data Output 124 LVB1P O B Link Positive LVDS Differential Data Output 125 LVB1M O B Link Negative LVDS Differential Data Output 126 VDDP O Digital Output Power 127 GND Ground 128 LVBOP O B Link Positive LV...

Page 29: ...ps 31 P2 7 A15 A bi directional I O port with internal pull ups 32 PSEN Program Store Enable 33 ALE Address Latch Enable 34 P4 1 A bi directional I O port with alternate function 35 EA I External Access Enableexternal ROM The ROM address and data will not be presented on the bus ifthe EA pin is high and the program counter is within the 64 KB area 36 P0 7 AD7 I O DDR Direct Bus Communication with ...

Page 30: ...Automatically calibrate chip ADC parameter by using chip internal DAC If it is a new built set and it is first time to do the auto color please confirm the following steps Connect the VGA cable with the standard video pattern generator and display 16 gray pattern on the monitor Press Power to power off the monitor Press simultaneously to enter factory mode Press Menu 1 then press Auto 2 to execute...

Page 31: ...unction 1 Signal is set as 1280x1024 60Hz 2 LCM button are from left to right checking whether each single function key and compound function key can be worked 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 Chroma Signal Generator Color Temperature 1 Do A...

Page 32: ...to default value 70 at 6500K 2 At full white patter Measure Y which should be 250 10cd m QDI 220 10cd m Chroma Signal Generator and Color Analyzer Panel 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 Signal Generator PC Power saving 1 Mode 1280x1024 6...

Page 33: ... 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 WIRE 1 KEYPAD CABEL KEYPAD ASSM 1 SCREW PW CROSS M3 5 Ni 2 SCREW I CROSS M3 4 Zw 2 Ace tape 4 INL PANEL 1 BRACKET_R 1 SCREW PW CROSS M3 5 Ni 2 SCREW I CROSS M3 4 Zw 2 Ace tape 2 IF BOARD 1 POWER BOARD 1 FFC CABLE 1 CLIP W...

Page 34: ...LATE 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 CROSS M3 5 Ni 2 SCREW I CROSS M3 4 Zw 2 Ace tape 4 BACK COVER SUB ASS Y 1 HINGE RIGHT 1 HINGE LEFT 1 SCREW F CROSS T4 10 Ni 4 SCREW I CROSS M3 4 Zw 1 BEZEL SUB ASSM 1 ID LABEL 1 SCREW B CROSS T4 10 BLK 4 BASE SUB ASSM 1 O...

Page 35: ...al or not please do it under 16 grey scalar pattern l This LCM is analog interface So if the entire screen is an abnormal color that means the problem happen in the analog circuit part if only some scale appears abnormal color that stand the problem happen in the digital circuit part l If you check the H V position please use the crosshatch pattern l This LCM support more than 30 timing modes if t...

Page 36: ...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 about 2V Check R803 R807 R824 R825 Check pin1 of IC802 voltage is 5 8V Check R812 R816 C818 END VA702 2_VA721 3_VA721b 3 ...

Page 37: ... 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 feedback circuit Check Vpin3 4 of IC801 about 6V Check Vpin1 2 of IC801 about 1V Check C815 D806 R812 Check R809 R814 END VA702 2_VA721 3_VA721b 3 ...

Page 38: ...811 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 Check pin3 of IC802 voltage about 1V Change R801 R805 R822 R823 R817 END Check the C pin voltage of IC803 if 3V Change IC803 VA702 2_VA721 3_VA721b 3 ...

Page 39: ... Connecting the output connector again Yes Yes LED Green Backlight cannot be turned on Is R526 Ok Is there high level voltage on pin8 of Check CN501 CN502 CN503 No Yes U501 U502 fail No IC501 fail Is Ok IC501 T501 T502 fail No Yes Is ok Yes Check protected circuit Q501 Q502 Q503 Q504 END Is there pulse waveform on pin1 pin3 pin15 and pin16 of IC501 at the moment of restart VA702 2_VA721 3_VA721b 3...

Page 40: ...ViewSonic Corporation Confidential Do Not Copy 37 6 Black Screen and backlight turn on VA702 2_VA721 3_VA721b 3 ...

Page 41: ...DS 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 NG OK NG OK OK NG OK NG NG Check LVDS signals OK Panel Fail NG Check Q101 Q102 Q107 R103 VA702 2_VA721 3_VA721b 3 ...

Page 42: ... 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 21 of U105 and pin 33 34 of U104 Check the communication of U104 and U105 OK NG OK NG NG OK NG OK VA702 2_VA721 3_VA721b 3 ...

Page 43: ...dded on 09 05 06 E 00008008 631102071930R 18 Hinge Cover HW 00005258 501020203000R 19 Screw B Cross T T 4 10 BLK ROHS HW 00005265 509412610500R 20 Screw F Cross T T 4 10 Ni ROHS HW 00005266 509212610300R 21 Screw P Cross M5 22 Ni ROHS HW 00005267 509116822300R 22 Screw I Cross M3 4 Zw ROHS HW 00005268 509016304102R 23 Screw PW Cross W WAS M3 5 NI HW 00005269 509146305300R 24 Bolt 4 40x11 8 Ni FOR ...

Page 44: ...l No Prefix Q84 Rev 1b Item ECR ECN ViewSonic P N Ref P N Location Universal number 1 Accessories Power Cord 10A 250V BLK 6FT RVV 3Gx0 China A 00005255 453070800170R 2 KIT ACCESSORY INL V4 LE1709 A 00005292 703000000536R 3 Key Board PCBA LE1709 ROHS B 00005278 790411500000R 4 Inverter Board PCBA LE1709 6A0 B 00005279 790411400600R 5 Sub Board IF BOARD V4 G3 LE1709 6A0 B 00005280 790411300620R 6 PC...

Page 45: ... TAPE WRAPPING TYPE VIEWSONIC 50mmx75M L For VSCN 0 00513 32 N A 506380001800R TAPE WRAPPING TYPE 48mmx50M LE1X04 05 For VSCN 0 004 33 N A 506250005102R LBL AGENCY VA702 LE1709 KOREA MARK For VSCN 1 34 N A 506150001310R PALLET 1120x980x120mm LE1709 For VSCN 0 01389 35 P 00005272 506120300400R BAG PE EPE L590xW480xT0 6mm PRINTED LE1 For VSCN 1 36 P 00005273 506120004500R BAG PLASTIC l690xW 455 145 ...

Page 46: ...00140R HRN LVDS FFC 30P 234mm RoHSACCX30234KU28 For VSCN 1 68 CB 00005260 430300800320R HRN ASS Y 4x2P 189mm UL2651 28SZ504479B For VSCN 1 69 CB 00005261 430300100210R HRN ASS Y 1P 137mm BLACK UL100 7 20 RoHS For VSCN 1 ViewSonic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 43 ...

Page 47: ...0005264 714050002400R ASSY BACK COVER LE1709 For VSCN VSA 1 35 N A 501020202900R COVER BACK LE1709 For VSCN VSA 1 36 N A 502080300300R SUPPORT VESA LE1709 ROHS For VSCN VSA 1 37 N A 503010001700R RUBBER SPACER L25xW10xT4 0mm LE1709 For VSCN VSA 1 38 N A 506102000500R LOGO PLATE VIEWSONIC LE1709 ELLIPSE For VSCN VSA 1 39 C 00005262 714020002400R ASSY BASE LE1709 For VSCN VSA 1 40 N A 501240201000R ...

Page 48: ...NIC LE1709 For VSCN 1 33 C 00005264 714050002400R ASSY BACK COVER LE1709 For VSCN 1 34 N A 501020202900R COVER BACK LE1709 For VSCN 1 35 N A 502080300300R SUPPORT VESA LE1709 ROHS For VSCN 1 36 N A 503010001700R RUBBER SPACER L25xW10xT4 0mm LE1709 For VSCN 1 37 N A 506102000500R LOGO PLATE VIEWSONIC LE1709 ELLIPSE For VSCN 1 38 C 00005262 714020002400R ASSY BASE LE1709 For VSCN 1 39 N A 5012402010...

Page 49: ...ic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 46 8 Exploded Diagram and Exploded Parts List 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 ...

Page 50: ...1709 6A0 1 6 HW 00003156 502020300700 BRACKET LEFT LE1709 1 7 B 00003172 502090301300 CHASSIS LE1709 1 8 CB 00003157 430300800320 HRN ASS Y 4x2P 189mm 1 9 HW 00003158 502020300710 BRACKET RIGHT LE1709 1 10 HW 00003159 502060401900 HINGE LEFT LE1709 1 11 C 00003160 714050002400 Assy Back Cover LE1709 1 12 HW 00003161 502060401910 HINGE RIGHT LE1709 1 13 B 00003042 790411500000 PCBA Keypad board LE1...

Page 51: ...ViewSonic Corporation Confidential Do Not Copy 48 Packing for Shipping VA702 2_VA721 3_VA721b 3 ...

Page 52: ...onic Model Number VS10781 2 Carton LE1709 Accessory Assm 1 5 1 ViewSonic Model Number VS10781 3W Rev 1a Item ViewSonic P N Ref P N Location Q ty N A 506020006820 N A 506020006830 2 P 00003051 506040005500 Cushion Left LE1709 1 3 A 00003676 453070800170 PWRCORD 10A 250V BLK 6FT CHINA 1 4 P 00003943 506120300400 BAG PE EPE L590xW480xT0 6mm PRINTED LE1 1 5 Accessory Assm After service card 1set 5 1 N...

Page 53: ...oard 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 Lamp4 AC Input 90V 264V XTAL2 14 318MHz 24C16 Open Protection Rectifier Filter Circuit 24C02 Block Diagram On Off Brightness On Off Brightness 12V 5V AP2301 PMBT3906 Panel Enable AOP605L 1 2 3 4 1 2...

Page 54: ...7 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 2 D806 A02 MEB C821 0 1u 50V ZD801 9 1V C R A IC803 TL431 R808 10K R804 68R 1 2W R809 100R L801 12mH 4 1 3 2 P801 AC IN 1 2 3 250V L803 5uH 5A RT801 5R R815 1K C822 0 1u 50V 400V SRF8 10 PGND C814 47u 25V Q802 2SC1815 1 3 2 BRIGHTNESS TO SCALER BD CN...

Page 55: ...T 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 560O C524 10P 3KV C504 1n 50V C534 0 1u 50V OVP2 OP2 R513 510 1 C522 220uF 25V AUO Q505 2N7002 1 3 2 D510 1N4148W R511 U502 AOP605 1 2 3 4 5 6 7 8 S1 G1 S2 G2 D2 D2 D1 D1 U501 AOP605 1 2 3 4 5 6 7 8 S1 G1 S2 G2 D2 D2 D1 D1 C509 220uF 25V D505 BAV99 1 2 3 R509 510 1 OP4 R508 100K ...

Page 56: ...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 50V DIMMER1 U102 FS8860 33PJ 3 1 2 VIN ADJ VOUT C109 100uF 16V VCC5V PANEL_ENABLE VAA1 C113 1u 16V C103 100uF 16V C111 0 1 50V VAA4 Q107 PMBT3904 From Power Inverter ON OFF C105 100uF 16V NC R101 10K C104 0 1 50V VAA4 VAA3 C114 0 1 50V BRIGHTNESS R1...

Page 57: ...n 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 6 2 7 3 8 4 9 5 11 12 13 14 15 10 16 17 GNDG R116 22 R115 22 R168 0 R119 2K2 C120 220p 50V DDC_SCL_VGA VCC5V R112 75 1 R122 47 R127 100 DDC_SDA_VGA TVS102 BAV99 DET_VGA R166 0 RIN DDC_SCL_VGA R111 75 1 R167 0 C123 47n 25V GNDB HSI C121 47n 25V R117...

Page 58: ...DDC AVSS_DVI AVSS AVSS_MPLL AVSS_LPLL AVSS_PLL AVSS_DVI GNDP GNDP GNDP GNDP 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 GPO7 AD0 GPO6 AD3 GPO5 AVDD_PLL AVDD AVSS AVSS_DVI LVACKP LVA3M LVA3P AVSS AD1 AD2 BUS TYPE NC CSZ SDA SCL HWRESETZ VPO C164 100p...

Page 59: ...6 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 DUPON2 0mm NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PA7 RXO3 RXE3 RXE3 PB5 CN103 AL2309 A0G1Z 1 2 3 4 6 8 10 12 14 16 18 20 22 24 26 28 30 7 9 11 13 15 17 19 21 23 25 27 29 5 PA8 PA2 PA4 Model Title Date Rev ViewSonic Corporation PA...

Page 60: ...5 6 7 20 21 22 24 25 26 27 28 29 30 32 35 36 37 38 39 40 11 13 14 16 17 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 P0 2 P0 1 P0 0 VDD RST P2 7 P3 3 INT1 P3 6 WR P4 3 INT2 P3 7 P1 6 PWM3 P1 7 PWM4 P4 0 ALE P4 1 R146 1K CCFL_ENABLE R134 10K C155...

Page 61: ...8 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 TACT KEY_DOWN DOWN LED_ORANGE KEY_UP SW104 SW TACT AUTO 2 SW102 SW TACT Model Title Date Rev ViewSonic Corporation KEYPAD ...

Page 62: ...ViewSonic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 59 11 PCB Layout Diagrams Main board Top layout ...

Page 63: ...ViewSonic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 60 Main board bottom Layout ...

Page 64: ...ViewSonic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 61 POWER board ...

Page 65: ...ViewSonic Corporation Confidential Do Not Copy VA702 2_VA721 3_VA721b 3 62 ...

Page 66: ...ion 4 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 Diagrams B Are you satisfied with this Service Manual Item Excellent Good Fair Bad 1 Service Manual Content 2 Service Manual Layout 3 The form and listing C Do you have any other opinions or sugg...

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