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ViewSonic VA902B - 19" LCD Monitor, Service Manual

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ViewSonic VA902B - 19

Model No.

 

VS10780

19

” 

Color 

TFT LCD Display

Service Manual

ViewSonic VA902/b

ViewSonic

“

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

(VA902/b_SM  Rev. 1a Oct. 2005 )

 

 

 

Summary of Contents for VA902B - 19" LCD Monitor

Page 1: ...Model No VS10780 19 Color TFT LCD Display Service Manual ViewSonic VA902 b ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 VA902 b_SM Rev 1a Oct 2005...

Page 2: ...and specifically 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...

Page 3: ...cuit Theory 4 Disassembly Assembly 6 Troubleshooting 9 PCB Layout Diagrams 7 Recommended Parts List 1 Precautions and Safety Notices 5 Test and Adjustment 8 Schematic Diagrams 1 3 4 15 19 24 32 42 46...

Page 4: ...ause 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 fro...

Page 5: ...e LCD 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 s...

Page 6: ...3 SCREW DRIVER 4 OSCILLOSCOPE 5 Soldering IRON 6 SOLDER 7 VGA Cable Black 15pins point to point 8 Color Analyzer 9 ISP Board 10 EDID Board 11 FOXISP EXE file 12 EDID program file 13 Power Adapter out...

Page 7: ...or Scaler TSU16AK AC Line Filter AC Socket TFT LCD Panel 19 Feedback OVP LTV817 Power Transformer MCU W78E65p Power Transformer2 Lamp1 Lamp4 AC Input 90V 264V XTAL2 14 318MHz 24C16 Open Protection Rec...

Page 8: ...5 provide internal Auxiliary current to CONTROL pin during normal operation In addition error amplifier and feedback current to the CONTROL pin are for duty cycle control 2 1 3 DC_5V and DC_14V Output...

Page 9: ...P 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...

Page 10: ...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 3 17 48 4kHz 60Hz 65 0 18 56 5kHz 70Hz 75 0 19 58 1kHz 72Hz...

Page 11: ...Pin No Symbol Description 1 2 5V VCC5V 5 2V output 3 6 GND Ground 4 BRIGHTNESS Brightness Control 5 ON OFF CCFL on off Control 6 3 CN106 Interface BD to Keypad Pin No Symbol Description 1 KEY_SELECT...

Page 12: ...XE1 minus signal of even channel 1 LVDS 16 RXE1 plus signal of even channel 1 LVDS 17 GND Ground 18 RXE2 minus signal of even channel 2 LVDS 19 RXE2 plus signal of even channel 2 LVDS 20 RXEC minus si...

Page 13: ...CMP_SST I Soft start and loop compensation capacitor 11 ISEN I Current sense feedback 12 VREF O Reference voltage output 13 VIN I Supply voltage for IC 14 HSB I High side driver buffer output 15 PDRV3...

Page 14: ...d 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 I PLL Power 54 GND Ground 55 AVDD ADC I ADC...

Page 15: ...d 101 NC Not connected 102 LVA3P O A Link Positive LVDS Differential Data Output 103 LVA3M O A Link Negative LVDS Differential Data Output 104 VDDP O Digital Output Power 105 GND Ground 106 LVACKP O A...

Page 16: ...tput 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 Ne...

Page 17: ...rol for DVI EDID 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 with alternate function 24 P2 0 A8 DC power on off control...

Page 18: ...Model Title Date Rev ViewSonic Corporation 15 ViewSonic Corporation Confidential Do Not Copy VA902 b 4 Disassembly Assembly 1 Exploded Diagram and Spare Parts List...

Page 19: ...SADDLE FOR CABLE 1 2 13 N A 506381000700 ACE TAPE 30000 45MM 3000PCS FOIL 1 3000 2 14 M 00003165 505040202000 INSULATOR MYLAR L79 9xW62 7MM CHASSIS LE1708 1 3 C 00003660 714050002500 BACK SUB ASS Y 1...

Page 20: ...SS M3 5 Ni 4 Ace tape 1 IF BOARD 1 POWER BOARD 1 FFC CABLE 1 CLIP WIRE 1 SCREW PW CROSS M3 5 Ni 4 BOLT 4 40x11 8 Ni 2 INSULATOR MYLAR 1 CHASSIS 1 BEZEL SUB ASSM G S BUTTON FUNCTION KEY 1 LED LENS 1 FR...

Page 21: ...E SUB ASSM 1 OPENING STAND LABEL 1 SCREW P CROSS M5 16 Ni 4 FRONT BEZEL G S 1 LED LENS 1 BUTTON FUNCTION KEY 1 LOGO PLATE THREE BRID 1 LOGO PLATE VIEWSONIC 1 BEZEL SUB ASSM G S BACK COVER 1 BACK COVER...

Page 22: ...se 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 adjust...

Page 23: ...olution Notice On Off H Position OSD Position V Position OSD Time Out Setup Menu OSD Background On Off Memory Recall 3 2 OSD lock Menu function OSD Lock Menu Function Check Item Method Phenomenon Acti...

Page 24: ...y you can see the Factory menu INL Currently using panel model name V2 050526 Currently using firmware version information Auto Color Automatically calibrate chip ADC parameter by using chip internal...

Page 25: ...between monitor and PC as below configure 7 2 Before plug in the power cord make sure keep key to be pressed when power on you can enter ISP mode 7 3 8051ispwriter exe will detect automatically which...

Page 26: ...ence VESA 640x480 800x600 1024x768 1280x1024 MAC 832x624 DOS 640x350 720x400 the detail supported modes and power saving signal 2 Confirm the above timing modes must be full screen and the picture mus...

Page 27: ...tern z 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 probl...

Page 28: ...ck 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...

Page 29: ...D801 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 o...

Page 30: ...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...

Page 31: ...D 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 Yes U501 U502 fail No IC501 fail Yes Is ok T501 T502 T501 T502...

Page 32: ...6 Black Screen and backlight turn on 29 ViewSonic Corporation Confidential Do Not Copy VA902 b...

Page 33: ...LCD 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...

Page 34: ...168 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...

Page 35: ...HRN ASS Y 1P 157mm CB 00003661 430300100200 100 16 HRN LVDS FFC 30P 185mm CB 00003662 430303000180 100 17 D Sub cable CB 00003047 453010100100 50 18 Hinge Left HW 00003663 502060000100 50 19 Hinge Ri...

Page 36: ...02500 50 15 HRN ASS Y 1P 157mm CB 00003661 430300100200 100 16 HRN LVDS FFC 30P 185mm CB 00003662 430303000180 100 17 D Sub cable CB 00003047 453010100100 50 18 Hinge Left HW 00003663 502060000100 50...

Page 37: ...09112612501 SCREW P CROSS T T 4 12 BLK HEAD 7 8mm For VSCN VSI VSE VSE UK 4 PC 30 HW 00003167 509212610300 SCREW F CROSS T T 4 10 Ni For VSCN VSI VSE VSE UK 4 PC 31 HW 00003666 509142716500 SCREW P CR...

Page 38: ...N A 506380002100 TAPE WRAPPING TYPE VIEWSONIC 50mmx75M LE1709 For VSCN VSI VSE VSE UK 0 0083 ROL 65 N A 506431002050 FILM PROTECTION UNPRINTED LE1909 18 For VSCN VSI VSE VSE UK 0 1 PC 66 N A 50609100...

Page 39: ...N A 430300800370 HRN ASS Y 4x2P 220mm UL2651 28 For VSA 1 PC 30 C 00003677 714030002510 ASSY BEZEL GRAY LE1909 For VSA 1 PC 31 N A 501010202910 BEZEL FRONT GRAY LE1909 For VSA 1 PC 32 N A 50103020220...

Page 40: ...iption Location Qty 61 N A 506380002100 TAPE WRAPPING TYPE VIEWSONIC 50mmx75M LE1709 For VSA 0 0083 ROL 62 N A 506431002050 FILM PROTECTION UNPRINTED LE1909 18 For VSA 0 1 PC 37 Do Not Copy VA902 b Vi...

Page 41: ...t Number SIZE TITLE DATE SHEET OF Rev DRAWN BY CHECK BY APPRO BY 1 2 D804 MUR1100 C802 1n 500V VCC5V C824 4700P Y1 D801 BL4 06 1 2 4 3 R822 3M3 R804 68R 1 2W C810 220u 25V C806 2200P Y2 R819 10K R827...

Page 42: ...BY CHECK BY APPRO BY D501 BAV99 1 2 3 R528 124K 1 R501 3M 3kv CN504 H L R532 10K R522 88 7K 1 HSD INL C505 0 01u 25V C529 220P G 50V U501 AOP605 1 2 3 4 5 6 7 8 S1 G1 S2 G2 D2 D2 D1 D1 1 2 D514 SKS20...

Page 43: ...R177 10K R103 4K7 PANEL_ENABLE C110 0 1 50V Q102 PMBT3906 VAA4 From Power Inverter C169 100uF 16V C113 1u 16V C107 0 1 50V C102 0 1 50V VCC5V Q108 PMBT3904 BRIGHTNESS U101 FS8860 18PJ 3 1 2 VIN ADJ V...

Page 44: ...5V C122 47n 25V R107 100 HSYNC C167 NC R114 10K R111 75 1 GIN DDC_SDA_VGA R122 47 VCC5V R108 1K C121 47n 25V PC5V_VGA SOG R116 22 DDC_SCL_VGA TVS105 5V6 D104 SN4148 R125 10K DDC_SDA_VGA R113 75 1 CN10...

Page 45: ..._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...

Page 46: ...XE3 RXO3 PA6 RXEC RXO1 RXE0 PA3 PA4 RXO2 PB0 PA 0 9 RXOC RXE0 RXOC RXE2 V01 6 5 A4 0921341040 LE1909 VA902 b PANEL INTERFACE 2005 06 07 InnoLux Document Number SIZE TITLE DATE SHEET OF Rev DRAWN BY CH...

Page 47: ...6V VCPU VCPU R134 10K AD0 LED_GREEN CN106 2x4PIN 8 1 3 5 2 7 4 6 C157 1000P 50V R158 51 VCPU R133 10K R159 220 R150 1K U106 24C16 1 2 3 4 5 6 7 8 A0 A1 A2 GND SDA SCL WP VCC RP103 10K 8 1 7 2 6 3 5 4...

Page 48: ...T UP KEY_SELECT AUTO AUTO 2 LED101 GREEN V01 2 2 A4 0921341039 LE1909 VA902 b KEYPAD 2005 06 02 InnoLux Document Number SIZE TITLE DATE SHEET OF Rev DRAWN BY CHECK BY APPRO BY KEY_POWER SW104 SW TACT...

Page 49: ...46 ViewSonic Corporation Confidential Do Not Copy VA902 b 9 PCB Layout Main board Top layout...

Page 50: ...47 ViewSonic Corporation Confidential Do Not Copy VA902 b POWER board...

Page 51: ...ality Systems Processes marc maupin viewsonic com d o o G t n e l l e c x E Precautions and Safety Notices 1 8 Exploded Diagram and Exploded Parts List 7 Recommended Spare Parts List Adjustment Proced...

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