ViewSonic va520 Service Manual
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ViewSonic va520 Service Manual

ViewSonic va520 Service Manual

15” color tft lcd display
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Service Manual

ViewSonic VA521
VE510b/s-21
Model No. VLCDS27996-1W
Model No. VLCDS27996-2W/-3W
15" Color TFT LCD Display
(VA521/VE510b/s-2_SM_819_1c Rev. 1c Oct. 2004)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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  • Page 1: Service Manual

    Service Manual ViewSonic VA521 VE510b/s-21 Model No. VLCDS27996-1W Model No. VLCDS27996-2W/-3W 15” Color TFT LCD Display (VA521/VE510b/s-2_SM_819_1c Rev. 1c Oct. 2004) 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

    4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram And Spare Parts List 9. Block Diagram 10. Schematic Diagrams 11. PCB Layout Diagrams VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • 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. For usage of this product please also refer to the user's manual. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 5: Specification

    V DISPLAY 11.122ms 15.253ms 13.714ms 12.800ms 12.678ms V B-Porch 1.907ms 1.049ms 1.114ms 0.427ms 0.528ms Vs Width 0.064ms 0.064ms 0.086ms 0.080ms 0.079ms V Border 0.191ms 0.254ms 0.000ms 0.000ms 0.000ms H/V Sync Interlace VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 6 0.064ms 0.056ms 0.060ms 0.124ms 0.106ms V Border 0.000ms 0.000ms 0.00ms 0.000ms 0.000ms H/V Sync Interlace ITEM TIMING 1024×768@72Hz 1024×768@75Hz Pixel Rate 77.066MHz 78.750MHz H TOTAL 17.232us 16.660us H DISPLAY 13.287us 13.003us VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 7 4.NC 9. +5V for DDC 14.V-sync 5.GND 10.GND 15.SCL SIGNAL LEVEL CONNECTOR SIGNAL DESCRIPTION 0.7vp-p(VIDEO) GREEN 0.7vp-p(VIDEO) BLUE 0.7vp-p(VIDEO) H/SYNC TTL positive or negative V/SYNC TTL positive or negative DDC1/2B DDC1/2B VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 8: Front Panel Function Control Description

    Main Menu. displayed control. Selects a highlighted control. Also, Power On/Off displays the control screen for the selected control and toggles between control pairs. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 9 • 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.) VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 10 (video signal input) Information coming from the graphics card in your computer. See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 11 Sharpness displays the menu shown below. Setup Menu Setup Menu Language Select Resolution Notifier OSD Position OSD Timeout 1:EXIT 2:SELECT The Setup Menu controls are explained below. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 12 [1] + [▼ ▼ ▼ ▼ ] + [▲ ▲ ▲ ▲ ] White Balance. (Keep pushing 5 sec) [1] + [▼ ▼ ▼ ▼ ] Power Lock [1] + [▲ ▲ ▲ ▲ ] OSD Lock VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 13: Circuit Description

    Analog input from RED channel RED_ Analog input ground from RED channel ADC_GND Analog ground ADC_GND Analog ground ADC_VDD Analog power (3.3V) Analog HS input (10), (4), (5) Analog VS input (2), (4), (5) VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 14 BGRN [1] / TCON [6] TCON [6] BCLKN BCLKN BGRN [0] / TCON [5] TCON [5] BG3P BG3P BGRN [7] BGRN [7] BGRN [7] BG3N BG3N BGRN [6] BGRN [6] BGRN [6] VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 15 AR3N TCON [5] ARED [5] / ARED [5] ARED [5] AR2P TCON [1] ARED [4] / ARED [4] ARED [4] AR2N TCON [0] ARED [3] / ARED [3] ARED [3] AR1P VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 16: Tcon [1]

    PWM2 / TCON [13] / Crystal out (2), (8), (9) COUT PWM2 / TCON [12] / PWM2 / TCON [12] / Crystal out (2), (8), (9) 6bit COUT dual TTL cannot support VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 17 (5) Schmitt trigger CMOS Input (Vt=1.4~2.2V); (6) Open-Drain, Output Drive low & Pull-high. (7) Bi-directional input/output (8) Programmable driving current (2~10mA) (9) TTL output 5V & 3.3V (10) 4V tolerance pad VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 18 There are two signals which control the inverter come from system to turn on the inverter and control brightness. Logic “low” level which send to I901 is turn on the inverter. BRI signal control brightness by DC level which was integral from PWM signal. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 19: Adjusting Procedure

    6500K verify : press “▼” ,“▲” key to move cursor to 6500K at factory mode and press “ 2 “ key, and then check the color temperature is x=0.313 ±0.02 y=0.329 ±0.02 Y≧200 cd/m VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 20: Trouble Shooting Flow Chart

    Check I901 pin1 voltage Check I802,I803 Check I901,I902, >1.0volts,<3.0volts If there had Sawtooth R904,R905 while inverter turn on waveform on DC output Check D809,D811. Check If there had Sawtooth Q901,Q902,D903,D904 waveform on DC outputr VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 21 Check X102 Crystal 24.576MHz is Change X102 working ? Check I101 Change I101 LCD Pin#46,47 data bus controller IC have signal Check panel Powers VLCD_3V3 VLCD_12V correct Change LCD panel VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 22: Recommended Spare Parts List

    700LX600WX0.03tmm PE-LD ADD>PE 2013150901 6P60 M-MS-0808-0027 Plastics: FUNCTION KEY VA521 ABS 94HB AL-PLATE 2044266102 1F03 PL-FK-0709-0151 NAME PLATE VIEWSONIC LOGO 3 PIN VA521 2051352000 1F04 M-MS-0808-9213 NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 2051352100 1F05 M-MS-0808-9214 NAME PLATE VIEWSONIC E015-017 2051352200...
  • Page 23 CD-OWNER GUIDE VE510B-2 WIZARD DATE:20040205 Added 10/08/04 A-CD-VE510B-2 2438501148 6P80 LABEL VE510B-2 VLCDS27996-3W M M-LB-0813-0981 2055632063 6P02 LABEL ViewSonic VA520 NUMBER STICKER M-LB-0813-0855 2055613281 6P03 LABEL VE510B-2 VLCDS27996-3W SMALL M-LB-0813-0982 2055636024 6P05 LABEL 10*20 HI-POT TESTED 0K M-LB-0813-0530 2055617101 6P13...
  • Page 24 CD-OWNER GUIDE VE510S-2 WIZARD DATE:20040205 VE510S-2 WIZARD DATA:20040205 A-CD-VE510S-2 2438501147 6P80 LABEL 6P02 VE510S-2 VLCDS27996-2W (M) M-LB-0813-0986 2055632062 LABEL 6P03 ViewSonic VA520 NUMBER STICKER M-LB-0813-0855 2055613281 LABEL 6P05 VE510S-2 VLCDS27996-2W SMALL M-LB-0813-0987 2055636023 LABEL 6P13 10*20 HI-POT TESTED 0K M-LB-0813-0530 2055617101...
  • Page 25 BOM LIST (VA521-1) ViewSonic Model Number: VLCDS27996 Rev: 1c Description Item ViewSonic P/N Ref. P/N Location Q'ty M-LB-0813-0856 2055613379 LABEL ViewSonic CONTAINER LABEL 6P11 1/96 E-C-0404-3815 2346410496 CAP,CHIP 85'C CS 0603/Y5V/50V 0.1u Z T C116 C122 C133 C134 C135 C136 C137 C138 C139 C140...
  • Page 26 J806 J812 L804 #N/A 2335310841 CAP,ELE LOW ESR 105'C EC 1000u/ 16V 10*16 P=5.0 C C816 C817 C819 M-LB-0813-0002 2056603050 SERIAL LABEL VIEWSONIC LCD SERIAL LABEL 6P55 6P54 6P51 #N/A 2379312196 BEAD,HI-IMPEDANCE Z= 120ohm(100MHZ~) 0603 200mA L104 L105 E-Q-0402-1624 2360301696...
  • Page 27 Item ViewSonic P/N Ref. P/N Description Location Q'ty E-IC-0450-0041 2365929996 IC,DIGITAL SMD MTV312M64-AJ PLCC44 MYSON I104 E-IC-0401-2269 2365915896 IC,DIGITAL SMD 24LC16B/SN MICROCHIP SO08 I105 #N/A 2365100996 IC,MEMORY AT24C16AN-10SI-2.7 SOIC8 ATMEL I105 #N/A 2365812696 IC,LINEAR(SMD) CM2860K1M223 SOT-223 CHAMPION I106 #N/A 2365813196...
  • Page 28 LED INDIC.-PWR VA521 PMMA 94HB 1F02 PL-FK-0709-0151 2044266102 FUNCTION KEY VA521 ABS 94HB AL-PLATE 1F03 M-MS-0808-9213 2051352000 NAME PLATE VIEWSONIC LOGO 3 PIN VA521 1F04 M-MS-0808-9214 2051352100 NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 1F05 M-LCD-0826-0223 2212004701 LCD PANEL CLAA150XG08V V901...
  • Page 29 BOM LIST (VE510b-2) ViewSonic Model Number: VLCDS27996 Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty M-LB-0813-0856 2055613379 LABEL ViewSonic CONTAINER LABEL 6P11 1/96 E-C-0404-3815 2346410496 CAP,CHIP 85'C CS 0603/Y5V/50V 0.1u Z T C116 C122 C133 C134 C135 C136 C137 C138...
  • Page 30 E-D-0403-1531 2363221195 DIODE,RECT PG208 D801 D802 D803 D804 M-LB-0813-0002 2056603050 SERIAL LABEL VIEWSONIC LCD SERIAL LABEL 6P55 6P54 6P51 M-MS-0808-0854 2097400301 EYELET BSS3-1/2H T=0.25 SN 3µｍ E801 E802 E803 #N/A 2251275096 RES,CHIP 1/10 RC 0603 1/10W 75 ohm F T...
  • Page 31 VA521 PMMA 94HB 1F02 PL-FK-0709-0151 2044266102 FUNCTION KEY VA521 ABS 94HB AL-PLATE 1F03 M-MS-0808-9213 2051352000 NAME PLATE VIEWSONIC LOGO 3 PIN VA521 1F04 M-MS-0808-9214 2051352100 NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 1F05 M-MS-0808-9212 2071969000 METAL FITTG SECC T=0.8MM FOR CPT VA521...
  • Page 32 Description Item ViewSonic P/N Ref. P/N Location Q'ty E-C-0405-4324 2301510391 CAP,MTL CF93M 0.010UF 100V J T C821 #N/A 2287147212 CAP,CER CK45E 4700.000PF 250VA M KC C823 E-C-0404-4212 2347410596 CAP,CHIP 85'C CS 0805/Y5V/50V 1.0u Z T C902 #N/A 2347427396 CAP,CHIP 85'C CS 0805/Y5V/50V 0.027u Z T...
  • Page 33 Description Item ViewSonic P/N Ref. P/N Location Q'ty #N/A 2253351596 RES,CHIP 1/8 RC 0805 1/8 W 5.1Mohm J T R903 E-R-0405-2983 2251382526 RES,CHIP 1/8 RC 0805 1/8W 82.5Kohm F T R906 E-R-0405-7121 2251390926 RES,CHIP 1/8 RC 0805 1/8 W 90.9Kohm F T...
  • Page 34 BOM LIST (VE510s-2 ViewSonic Model Number: VLCDS27996 Rev: 1a Item ViewSonic P/N Ref. P/N Description Location Q'ty M-LB-0813-0856 2055613379 LABEL ViewSonic CONTAINER LABEL 6P11 1/96 C116 C122 C133 C134 C135 C136 C137 C138 C139 C140 C141 C142 C143 C148 C149 C151 C154 C157...
  • Page 35 R904 R905 R910 R911 #N/A 2259210308 RES,CHIP NETWORKS 8P4R 1/16W 10Kohm J P=0.8 RN1 RN2 RN3 RN4 M-LB-0813-0002 2056603050 SERIAL LABEL VIEWSONIC LCD SERIAL LABEL 6P55 6P54 6P51 E-C-0404-3898 2341110096 CAP,CHIP 125'C CS 0603/COG/50V 10p J T C101 C105 C108 #N/A...
  • Page 36 VA521 PMMA 94HB 1F02 PL-FK-0709-0151 2044266102 FUNCTION KEY VA521 ABS 94HB AL-PLATE 1F03 M-MS-0808-9213 2051352000 NAME PLATE VIEWSONIC LOGO 3 PIN VA521 1F04 M-MS-0808-9214 2051352100 NAME PLATE VIEWSONIC E015-006 3-BIRD LOGO 1F05 M-MS-0808-9212 2071969000 METAL FITTG SECC T=0.8MM FOR CPT VA521...
  • Page 37 Item ViewSonic P/N Ref. P/N Description Location Q'ty E-Q-0402-7031 2360608696 FET,N-CH(SMD) AO4826 SO-8 I902 M-WR-0828-0460 2428106125 JUMPER 0.6f 12.50MM J804 #N/A 2233410095 RES,CBN 1/4 S RD 1/4WS 10.00 J T52 MINI J805 M-WR-0828-0451 2428106150 JUMPER 0.6f 15.00MM J905 M-MS-0808-9218 2434410300 AL SHIELDING TAPE W25*L30mm*T0.06 (AL)

  • Page 38: Exploded Diagram And Spare Parts List

    FIG.2 20-1 20-2 18 X6 MAIN PCB ASS'Y FIG.1 KEYPAD PCB ASS'Y P961 V901 4 X2 1-2 1-3 23 X2 FIG.2 POWER PCB ASS'Y 9 X4 15-2 15-3 15-1 19 X2 VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 39: Lcd Panel

    P801 P802 P105 P107 P901 P801 P101 P105 MAIN PCB MAIN PCB (for M-Star Scaler) (for Realtek Scaler) POWER PCB P107 P104 P102 P101 P701 P902 KEYPAD PCB P961 I/O CABLE VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 40 EXPLODED PARTS LIST (VA521-1) ViewSonic Model Number: VLCDS27996 Rev: 1b Item ViewSonic P/N Ref.P/N Description Q'TY Location Remark C-FP-0301-0993 2024266703 FRONT BEZEL ASS'Y ABS 94HB PS-7604B/C4001 1F01 M-MS-0808-9212 2071969000 METAL FITTG SECC T=0.8MM FOR CPT VA521 1F11 M-MS-0808-9219 2072456900 INSULATOR MYLAR BLACK 94V0 T=0.5 POWER...
  • Page 41 EXPLODED PARTS LIST (VE510b-2) ViewSonic Model Number: VLCDS27996 Rev: 1c Item ViewSonic P/N Ref.P/N Description Q'TY Location Remark C-FP-0301-0991 2024266704 FRONT BEZEL ASS'Y ABS 94HB MIDNIGHT GRAY 1F01 M-MS-0808-9212 2071969000 METAL FITTG SECC T=0.8MM FOR CPT VA521 1F11 M-MS-0808-9219 2072456900 INSULATOR MYLAR BLACK 94V0 T=0.5 POWER...
  • Page 42 Disassembly of Front Cover Hinge Cover " Hinge Cover " 1. Unscrew two screws of Rear Cover. 2. Remove two Hinge Cover. 2084740104 Front Cover 3. Remove Front Cover from Monitor. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 43 2. Detach Rear Cover and LCD Panel module from the monitor. 3. Unscrew one screw that secure M/B Shielding Plate. 4. Unscrew one screw that secure Inverter down Shielding Plate. 5. Remove Inverter top Shielding Plate. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 44 & 6. Disconnect three connectors to remove Inverter connector and LCD Panel FPC cable. 2080002200 7. Unscrew four screws that secure Metal Fitting and remove LCD Panel from Metal Fitting. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 45 1. Unscrew four screws that secure Main Board and disconnect the wires which are connected to Main Board and remove Main Board. " 2080003700 2. Unscrew four screws that secure Power Board to remove Power Board. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 46 Disassembly of Stand unit from Rear Cover 2084730082 1. Unscrew six screws that secure Stand unit and detach Stand unit from the monitor. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 48: Schematic Diagrams

    C178 C177 C179 R190 ADC_ 3AVCC R191 C180 C181 47uF/16V 100nF 47uF/16V 100nF RTD 3PVCC 100nF 22uF/16V Q108 MMBT3906 PC5V D116 D117 R192 PC5V IN4148 IN4148 D116,D117 0 OHM 1206 (AU) VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 49 VCC3V3 CON13 R111 R112 C107 L103 0R 0603 0R 0603 47nF RED+ R113 C108 D101 D103 D104 10pF IN4148 IN4148 IN4148 R114 C109 47nF RED- D106 D107 D108 IN4148 IN4148 IN4148 VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 50 TCON9 BXDIO TCON7 R172 XSTB R176 100/NC TCON5 R193 XSTB AR2N DDC_DAT TCON1 R194 FXDIO R177 100/NC R171 FXDIO DDC_CLK VA721(A) RN6, R171, R172 NC C182 C183 VA521(A) RN5, R193, R194 VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 51 R150 power VCC3V3 CON8 Q103 MMBT3906 R157 C131 C130 C129 C128 C126 C125 C127 NC/100p NC/100p NC/100p NC/100p LED_G 3 (C) NC/100p NC/100p NC/100p GREEN C124 1 (B) 2 (E) VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 52 AC IN 100~240V 1000P dip D813 R811 18-2 /DIP (1) SMD resistor - power rating is 1/6W,if not indicated (2) SMD capacitpr - temperture is 85'C & voltage is 50V,if not indicated. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 53 0.1uF 82K5 R906 D905 Brightness 82.5K 1N4148 DIP (1) SMD resistor - power rating is 1/8W,if not indicated (2) SMD capacitpr - temperture is 85'C & voltage is 50V,if not indicated. VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 54: Pcb Layout Diagrams

    11. PCB Layout Diagrams 11-1 MAIN PCB TOP VIEW VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 55 11-2 MAIN PCB BOTTOM VIEW VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 56 11-3 CON PCB TOP VIEW 11-4 CON PCB BOTTOM VIEW VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 57 11-5 POWER PCB TOP VIEW VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...
  • Page 58 11-6 POWER PCB BOTTOM VIEW VA521 Confidential - Do Not Copy ViewSonic Corporation VE510b/s-2...

  • Page 59: Block Diagram

    Company: Add.: Fax: Tel: 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) VA521 Confidential - Do Not Copy...

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