ViewSonic VA702-1 Service Manual

ViewSonic VA702-1 Service Manual

Color tft lcd display
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Service Manual

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

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Summary of Contents for ViewSonic VA702-1

  • Page 1: Service Manual

    Service Manual 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...
  • Page 2: Revision History

    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.
  • Page 3: Table Of Contents

    Specification Front Panel Function Control Description Circuit Description Adjustment Procedure Troubleshooting Flow Chart Recommended Spare Parts List Exploded Diagram and Exploded Parts List Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 4: Precautions And Safety Notices

    Keep wires away from high voltage, high temperature components and sharp edges. Keep wires in their original position so as to reduce interference. Adjustment of this product please refers to the user’ manual. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 5 Do not touch the surface of the that may cause "Mura". polarizer. Taking out the monitor by grasping the LCD panel. Take out the monitor with cushions. That may cause "Mura". ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 6 Placing the monitor on foreign objects, That could Place the monitor on a clean and soft foam pad. scratch the surface of the panel or cause "Mura". The panel is placed facedown on the lap. That may cause "Mura". ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 7: Specification

    UL, cUL, FCC-B, CB, CE, ENERGY, NOM, TUV/GS, TUV ERGO (covers ISO13406-2 & MPRII), TCO’03, GOST-R+20 ORIGINAL Regulation COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C- TICK), TUV-S, Green Mark, Energy Star, RoHS, WEEE ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 8 640 x 350, 640 x 480, 720 x 400 (640 x Resolution Compatibility 400*), 800 x 600, 832 x 624, 1024 x 768, 1152 x 870, 1280 x 720, 1280 x 1024 Exclusions Not compatible with interlaced video ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 9 Color = Black Power Saving Operation(Method) VESA DPMS Signaling On Mode < 36 W (max) / 35 W(typ) Power Consumption Off Mode< 1W Recovery Time On Mode = N/A, Active Off < 3 sec ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 10 ● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto Image Adjust”. ● The monitor needs to do “Auto Image Adjust” the first time when a new mode is detected. (See section “0-Touch™ Function Actions”) ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 11 Minimum: 150º Response Time 12 ms (Tr= 3 ms, Tf = 9 ms) (typ) 10%-90% @ Ta=25°C 16 ms (Tr= 5 ms, Tf = 11 ms)(max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 12 155º Response Time 8 ms (Tr= 2 ms, Tf = 6 ms) (typ) 10%-90% @ Ta=25°C 18 ms (Tr= 7 ms, Tf = 11 ms)(max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 13 155º Response Time 8 ms (Tr= 2 ms, Tf = 6 ms) (typ) 10%-90% @ Ta=25°C 16 ms (Tr= 6 ms, Tf = 10 ms)(max) Panel Defects Please see Panel Quality Specifications. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 14 Wx= 0.335 +/- 0.02 CCT (Max) = 5915K Wy= 0.350 +/- 0.02 CCT (Min) = 4935K Preset Color Temperature Each color preset shall be adjustable. Red, Green, Adjustability and Blue shall be individually controlled. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 15 ViewSonic The reference for the bezel is the black color (VA702) and the midnight gray color (VA702b) chip provided by ViewSonic. Neck, Base, and Rear Cover Color The color difference between any two cabinet components shall be less than 0.80 “Delta E”, in the 1976 CIE L*a*b Colorspace.
  • Page 16: Front Panel Function Control Description

    Image Adjust. Scrolls through menu options and adjusts the Displays the displayed control. Main Menu or Also a shortcut to exits the display the control screen Contrast and saves adjustment control adjustments. screen. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 17 • If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible. (The black border around the edge of the screen should barely touch the illuminated “active area” of the LCD display.) ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 18: Main Menu Controls

    9300K - Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting). 6500K - Adds red to the screen image for warmer white and richer red. 5400K - Adds green to the screen image for a darker color. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 19 3. When all color adjustments are complete, press button [1] twice. Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic website URL. See your graphics card’s user guide for ®...
  • Page 20 OSD Background allows the user to turn the OSD background On or Off. Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 21: Circuit Description

    Q802, R827, R828 and ZD801 make up of dummy loading circuit. For start-up sequence, during 5V output take place high loading first, this dummy loading circuit operated to insure 14V not be increased. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 22 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. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 23: Factory Preset Timing Table

    70Hz 75.0 58.1kHz 72Hz 78.5 1024 x 768 60.0kHz 75Hz 78.8 68.67kHz 85Hz 94.5 1152 x 870 68.6kHz 75Hz 63.4kHz 60Hz 1280 x 1024 79.97kHz 75Hz 1280 x 720 45kHz 60Hz 74.2 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 24: Ac Outlet Pin Assignment

    6.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent) Symbol Description H.V. High voltage for lamp L.V. Low voltage for lamp 6.2 CN101 (Power BD to Interface BD) Symbol Description +5V (VCC5V) +5.2V output Ground ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 25 Power supply (5.0 V) 6.5 CN102 (D-SUB Connector) Symbol Symbol Symbol Red video input Red GND Green video input Green GND Serial data (SDA) Blue video input Blue GND H / H+V SYNC ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 26 Not connected BUSTYPE Low : Serial bus; High : Direct bus Not connected Not connected Not connected Ground VDDP Digital Output Power Not connected Not connected Not connected Not connected Not connected ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 27 DDR direct bus WRZ; active low RDZ/SCL DDR direct bus RDZ; active low CPU interrupt; 4mA driving strength PWM0; 4mA driving strength PWM0 PWM1; 4mA driving strength PWM1 Not connected Not connected ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 28 B-Link Negative LVDS Differential Clock LVBCKM LVB2P B-Link Positive LVDS Differential Data B-Link Negative LVDS Differential Data LVB2M B-Link Positive LVDS Differential Data LVB1P B-Link Negative LVDS Differential Data LVB1M VDDP Digital Output Power ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 29 DDR Direct Bus Communication with Scaler P0.3/AD3 WRZ line of DDR Direct Bus P0.2/AD2 RDZ line of DDR Direct Bus P0.1/AD1 ALE line of DDR Direct Bus P0.0/AD0 Hardware reset to Scaler +5V for MCU working voltage VA702-1_VA702b-1 ViewSonic Corporation Confidential - Do Not Copy...
  • Page 30: Disassembly Block

    (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) CHASSIS*1 IF BOARD*1 POWER BOARD*1 FFC CABLE*1 CLIP,WIRE*1 INSULATOR,MYLAR*1 (SCREW,PW,CROSS,M3*5, Ni*5) (BOLT, #4-40x11.8, Ni*2) Note: Arrows are disassembly directions. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 31: Assembly Block

    (SCREW,P,CROSS,M5*22, Ni*4) HINGE,RIGHT*1 HINGE,LEFT*1 (SCREW,F,CROSS,T4*10, Ni*4) S/N LABEL*1 (SCREW,I ,CROSS,M3*4,Zw*1) QC LABEL*1 HI POT LABEL*1 BEZEL SUB-ASSM *1 ID LABEL*1 V17 LCD MONITOR (SCREW,B,CROSS,T4*10, BLK*4) FINAL ASM(INL) Note: Arrows are assembly directions. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 32: Adjustment Procedure

    Red (+ / -) User Color Green (+ / -) Blue (+ / -) Information Manual Image Adjust H Position (+ / -) H/V Position V Position (+ / -) H Size + / - ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 33 [1] + [▼] 10S(again) Lock NOTICE: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button Locked” Power should only be lockable in the “On State” ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 34 2. If the “EDID Rewrite” process finished, please pull out VGA cable and press ‘’2’’+’’▲’’ at the same time. 3. Pull out AC power cable or press power key to restart. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 35 Chroma Signal modes and power saving signal. check Generator 2. Confirm the above timing modes must be full screen and the picture must be normal. 3. LED is Orange at power saving mode. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 36 Contrast: Default generator and Power Check power consumption at each modes meter Power saving Power AC input: State LED color Consumption 230V/50Hz Normal Green <38W Stand By Orange <1W Power Key Off <1W ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 37: Troubleshooting Flow Chart

    This LCM support more than 30 timing modes, if the input timing mode is out of specification, the picture may appears abnormally. If brightness uneven, repairs Inverter circuit or change a new panel. If you find the vertical line or horizontal line lost on the screen, please change panel. ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 38 Check R801, R805, IC802 voltage R822, R823, R817 about 1V Check pin2 of IC802 Check R803, R807, voltage about 2V R824, R825 Check R812, R816, Check pin1 of IC802 C818 voltage is 5.8V ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 39 Check R809, R814, Check reference IC801, R818 voltage of IC801 Check R810, R811 Check C815, D806, Check Vpin3-4 of Check feedback IC801 about 6V R812 circuit Check Vpin1-2 of IC801 about Check R809, R814 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 40: Output Power Is Unstable

    Check R809, R808, R814, D809 Check pin1 of Check D806, C815 if IC802 voltage short is 5.8V Change D806, C815 Check pin3 of Change R801, R805, IC802 voltage R822, R823, R817 about 1V ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 41 Is Ok IC501? U501, U502 fail pin1, pin3, pin15 and pin16 of IC501 at the moment of restart? IC501 fail T501, T502 fail Is ok T501, T502? Check protected circuit Q501, Q502, Q503, Q504 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 42 6. Black Screen and backlight turn on ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 43: White Screen

    LVDS Cable NG Check VLCD is 5V Check LVDS signals Panel Fail Check Panel-Enable of Check the HWRESET of Check RP101 U105(pin2) is low U104 exists Check Check the pins of Q101,Q102,Q107,R103 U105 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 44: Bad Screen

    LVDS Cable NG 1.Check Check Crystal:pin20,21 of X101,C154,C155 U105 and pin 33,34 of U104 2.Check X102,C126,C168 Check ALE/RDZ/ Check the communication of WRZ/AD0/AD1/AD2/ U104 and U105 AD3/HWRESET Check the pins of U104 and U105 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 45: Recommended Spare Parts List

    Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.
  • Page 46 Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.
  • Page 47 BOM LIST (VA702-1) ViewSonic Model Number: VS10781 Serial No. Prefix: PST Rev: 1b Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty (PC) CB-00005261 430300100210R HRN ASS'Y 1P 137mm BLACK,UL1007 #20,RoHS CB-00005260 430300800320R HRN ASS'Y 4x2P 189mm UL2651#28SZ504479B, For VSI...
  • Page 48 BOM LIST (VA702B-1) ViewSonic Model Number: VS10781 Serial No. Prefix: PSX Rev: 1b Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty (PC) CB-00005261 430300100210R HRN ASS'Y 1P 137mm BLACK,UL100 7 #20,RoHS For VSI&VSA CB-00005260 430300800320R HRN ASS'Y 4x2P 189mm UL2651#28SZ504479B, For VSI&VSA...
  • Page 49: Exploded Diagram And Exploded Parts List

    8. Exploded Diagram and Exploded Parts List ViewSonic Corporation Model Title Exploded diagram Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 50 EXPLODED PARTS LIST (VA702-1) ViewSonic Model Number: VS10781 Rev: 1a Item ViewSonic P/N Ref. P/N Description Q'ty C-00003154 714030002400 ASSY,BEZEL(S),LE1709 E-00003048 631102070270 LCD PANEL 17" MT170EN01-V1(INNOLUX) B-00003041 790411300600 PCBA,IF BOARD, LE1709-6A0 CB-00003155 430303000140 HRN LVDS FFC 30P 234mm,ACCX30234KU28MY B-00003043 790411400600 PCBA,PWR&INV./B, LE1709-6A0...
  • Page 51: Block Diagram

    9. Block Diagram On/Off Brightness Power ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 52: Schematic Diagrams

    3K3 1% RT801 47u/25V C824 PGND 4700P Y1 F801 2A 250V CN801 08DA-6S VCC5V BRIGHTNESS ON/OFF P801 C821 ViewSonic Corporation AC IN 0.1u/50V TO SCALER BD CN101 Model POWER SUPPLY Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 53 R524 51KΩ 47KΩ 47KΩ C531 C534 C532 C533 100K R508 0.1u/50V 0.1u/50V 0.1u/50V 0.1u/50V R521 R519 R517 R515 NOTE: ViewSonic Corporation D512 D511 D510 D509 紅色粗線:表示高電壓迴路; 1N4148W 1N4148W 1N4148W 1N4148W 紅色虛線:表示易發熱元件; Model 橘色粗線:表示大電流迴路; INVERTER Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1...
  • Page 54 AP2301N VLCD ON/OFF R101 C108 CCFL_ENABLE R170 0.1/50V C114 R157 C109 C110 0.1/50V Q103 100uF/16V 0.1/50V PMBT3904 Q102 PANEL_ENABLE PMBT3906 R103 R169 Q107 PMBT3904 ViewSonic Corporation Model DC INPUT Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 55 C119 R120 C120 TVS104 TVS105 TVS106 TVS107 33p/50V 220p/50V DDC_SDA_VGA R127 R126 R125 DDC_SCL_VGA R124 D103 PC5V_VGA SN4148 U103 D104 VCC5V C124 AT24C02N-10SI SN4148 0.1/50V ViewSonic Corporation Model VGA_INPUT Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 56 22p/50V R129 BUS TYPE/NC X102 VAA4 VDPLL 14.318MHz VAA4 XOUT C168 FB107 22p/50V BEAD60OHM C144 C145 10u/16V 0.1/50V Note: U104 pin4,5,7~9,12~17,22~27,75,76,79~83,88~93,98~101 are all NC (open) ViewSonic Corporation Model SCALER Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 57 VLCD CN104 DUPON2.0mm/NC RXO0- RXO0+ RXO1- RXO1+ RXO2- RXO2+ RXOC- RXOC+ RXO3- RXO3+ RXE0- RXE0+ RXE1- RXE1+ RXE2- RXE2+ RXEC- RXEC+ RXE3- RXE3+ VLCD ViewSonic Corporation Model PANEL INTERFACE Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 58 P4.2 P3.1/TXD R152 C153 DDC_SCL_VGA P3.0/RXD R142 R143 R144 NC/10u/16V VCPU Q104 PMBT3906 LED_GREEN R145 X101 R158 C154 C155 22.1184MHz 12p/50V 12p/50V Q105 PMBT3906 LED_ORANGE ViewSonic Corporation R159 Model Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 59 KEY_DOWN GREEN ORANGE KEY_UP SW101 SW102 SW103 SW104 SW105 CN106 2x4PIN SW TACT SW TACT SW TACT SW TACT SW TACT MENU/1 AUTO/2 POWER DOWN ViewSonic Corporation Model KEYPAD Title Date Rev: ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 60: Pcb Layout Diagrams

    11. PCB Layout Diagrams Main board Top layout ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 61 Main board bottom Layout ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 62: Power Board

    POWER board ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 63 ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...
  • Page 64 Company: Add: Tel: Fax: E-mail: After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com) ViewSonic Corporation VA702-1_VA702b-1 Confidential - Do Not Copy...

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