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ViewSonic va720-1 Service Manual

17" color tft lcd
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Summary of Contents for ViewSonic va720-1

  • Page 2: Service Manual

    Service Manual ViewSonic VA720-1 VE175/b-1 Model No. VLCDS23895-3W 17” Color TFT LCD Display ViewSonic ® (VA720-1_SM_542 - Rev. 1a – May 2002) ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583...

  • Page 3: 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. Trademarks ViewSonic is a registered trademark of ViewSonic Corporation.

  • Page 4: Table Of Contents

    5. BLOCK DIAGRAM ........................7 6. SCHEMATIC DIAGRAMS....................8~15 7. THEORY OF OPERATION.....................16 8. WIRING DIAGRAM ........................17 9. PCB LAYOUT ........................18~23 10. TROUBLE SHOOTING FLOW CHART ................24~27 11. ADJUSTMENT……………………..................28~30 12. ELECTRICAL PARTS LIST....................31~38 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 5: Precautions & Safety Notices

          %      % %   %                /                      %                            &     0  1.3. SERVICE NOTES             %              %      1         2      3  4   % &    %  5     %  6 +               7 +                  5 '               ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 6: Service Tools & Equipment Required

    2. SERVICE TOOLS & EQUIPMENT REQUIRED 2. SERVICE TOOL & EQUIPMENT REQUIRED  $"#!8#9! 1 .'8".99 6 :$"88:$:*9 7 $ 9( "-9 5 " :! ; /$: /9 < $:8(9 = ('..>8:(25 ?1@@4 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 7: Specifications

    @1;724E@1;72-4 8((   ;<.  . 32=% 4   @ -    0 F=5GH=5G -  F=5GH=5G  HI@G6G     5@@F2 4 /   1@@? 2 4 15@? 2 4    F5F@  (   66<I124E1<@672-4    :  F@GJH7@G $ F1@GJH;@G    '8$($K-9B/-(9/9  $  *  "  -  F@@J17@-     F5@ 2. 34 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 8 3.3. D-SUB CONNECTOR           " !#$  % &  $                 @<2-"(9:4 # 99! @<2-"(9:4 /8'9 @<2-"(9:4 ?$>! 8      -?$>! 8      ((?1/ ((?1/ ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 9: Exploded View & Parts List

    D701 9R01 FIG.3 POWER PCB ASS'Y 1F22 1F23 X2 1F25 FIG.2 1F14 I/O CABLE 9H02 5B03 5B09 5B05 D804 5B07 1F20 1F24 I801 1F12 P953 9S02 9H01 5B02 X4 1F13 9S01 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 10: Exploded View & Parts List

         !  !  "   $(  )* +    $(  )* + * '+ %"   !  2& 3 ' 434   $(  )* + %" ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 11: Block Diagram

    CONVERTER DISPLAY 3.3V POWER REGULATOR I101,D101,L102 I102 HIGHT VOLTAGE INVERTER U901 Micro KEY PAD VGA INPUT CONTROLLER IC CONTROLLER & P103,P105 I103 I109 I112 EERROM I105 I119 X101 LVDS INTERFACE I117,I118 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 12: Schematic Diagrams

    RB:AIC1084-33CM R103 2K Q102 PSC1 MMBT3904L Q103 I102 3V3_A R104 HUF76107D 3V3_B INPUT OUTPUT C110 C111 C112 C113 AIC1084 0.1u 330uF/25v 0.1u 330uF/25v C114 0.1u R105 R106 Q104 PSC0 MMBT3904L R107 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 13 0.1u DDC_SCL DDC_SDA 3V3_A VD_33 L111 200R C154 C155 C156 C157 C158 C159 C160 C161 C162 C163 C164 C165 22uF/25v 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 14 I111 C206 C207 C208 C209 C210 C211 C212 C213 C214 C215 C216 C217 C218 C219 C220 330uF/25v 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u 0.1u ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 15 4.7k 3OE_ C235 C236 C234 ROM_SCL 0.1u ROM_SDA ASIC_SCL TCM810 SN74LVC125A ASIC_SDA D110 R177 SD_MODE 1N4148 BL_ONOFF P107 C237 0.1u MCU_SCL1 MCU_SDA1 ASIC_SCL I119 I114 ASIC_SDA R178 R179 24C16 DIP SO-8 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 16 R182 R199 L126 OSD_CLK MCU_HSIN R183 C241 C242 HSYNC_A MCU_VSIN I116 R185 VSYNC_A R184 FCLK1 FBIN CLK2 L127 200R 74HC4053 C243 C244 C245 CLK1 HSYNC_X 10uF/25v 0.1u AV9173-01 R188 3v3_B INPUTSEL ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 17 22uF/25v 0.1u 0.1u CLKSEL CLKOUTM TXECKP CLKOUTP TXE3M R192 TXE3P 3V3LVDSP LVDSGND L130 PLLGND 3V3LVDSP PLLVCC PLLGND 200R C260 C261 C262 SHTDN LCD_CLK CLKIN LCD_HS LCD_DE 22uF/25v 0.1u 0.1u LCD_VS SN75LVDS83 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 18 BO-7 C316 22P BE-4 BE-5 BE-6 LCD_HS RB[0..7] HSYNC BE-7 C317 22P C318 22P LCD_VS VSYNC C319 22P C320 22P LCD_DE LCD_CLK ODCK C321 22P C322 22P C323 22P C324 22P ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 19 F801 100PF NPO R811 R810 19.1K 1% R802 2.5A/250V R813 100 C810 R807 0.033UF/50V MEF 16.2K 1% I802 TLP721F C820 0.1UF/50V MEF I803 P801 TL431D AC IN 100-240V R812 4.87K 1% ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 20: Theory Of Operation

                   '  +.#=<     @      %,         !   0*-    0*--- !    0>53C#!*2  3  #!*2     45+  2        2 '8 2    !4 2   2   #!*2     2    !42    45+  2 (8  6 3@*   ' ,6  45+         0*- C     '        ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 21: Wiring Diagram

    P108 P112 P104 P109 P101 P802 P110 P961 P107 POWER PCB P111 I109 MAIN PCB I103 P403 TO:METAL FITTG GND P401 P402 P105 P103 P801 P953 (BLU) (BRN) AC SOCKET ASS'Y ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 22: Pcb Layout

    9. PCB LAYOUT 9.1. MAIN PCB TOP VIEW ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 23 9.2. MAIN PCB BOTTOM VIEW ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 24 9.3. CON PCB TOP VIEW ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 27 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 28: Trouble Shooting Flow Chart

    10.1. NO POWER Start Check 12V on F801,D810,D811, C103/+ D812,D813,I801, D804 I101 D111 Check Pin 1 short L101 >11V I101 Replace Check Pin 2 R108,I101 Pulse Check Check Q101,Q102, C108,C105,I102 D101,D111, C105 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 29 Check IIC Check Trace pin 31,32 of heven't open I112 are or short high level TO I114 and I103 Check AD0,AD1,AD2, Check AD3 Voltage Pin key-pad and P109 33,34,35,36 of I112 ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 30 67 of I103 R111,C121,C122 colok Check 12M Check R.G.B. VCLK1,VCLKD0, DATA on I109 VCLKD1 Check LCD_CLK LCD_DE LCD_VS LCD_HS Check Check C288 high Q107 Check R159 Check Voltage Range Q108 Invertor unit failed ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 31 Check Check Check your R-pack P103 RP1~RP6 PC or soldering soldering Pin 2,4,6 Check Check R-pack L106,107,108 Poor RP19~RP30 soldering R113,115,117 soldering R112,114,116 I109 poor I103 soldering fail or poor soldering ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 32: Adjustment

         " 7  ?7                 *"$  ?    ? (  B     C          5- 6 ( )* ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 33 5>6 <>0! 84 5@6B  C?B  C !  <>0  E   E   1  2009 5<6 >@0! 84 5@6B  C?B  C !  >@0  E   E@   5A6 7     - ?(  - ?7   /--9/+F     ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 34 D08 E   ED   <>08 E   E  1  2009 >@08 E   E@     ," 5 6 #          56 ,                    !        56 .      ? /#$  7%4/--      ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

  • Page 35: Electrical Parts List

    #(+), -. )$ !"#""$# %&'()* #(+), -. # !"#""$# %&'()* #(+), -. # !"#""$# %&'()* #(+), -. !"#""$# %&'()* #(+), -. #! !"#""$# %&'()* #(+), -. #" !"#""$# %&'()* #(+), -. ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 36 .  2) !" $# %&' )* #(67 .  2# !" $# %&' )* #(67 .  22 !" $# %&' )* #(67 .  2( !!!"!!2 %0''11)* 1" !!-. ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 37 !#"#$# '61<'B&<0 ""(!)9) B10'7<(  !#"#!$# '61<'B&<0 ""( '61<0''01.  !#")!$$# '61/11:<0 @/,))A),# &''< ' !#)$$)$# ''7'B%<0 0 )$# <B6A #! !#)("($# ''1%:><0? %02)()A!!<B %B6 #! !#)(2"$# ''1%:><0? %'("A!!0 %'B6A #! ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 38 !#! $# 9'<B6::<0 00@B!$" '61<<6BA ! F! !### $# .1BA&><0? &-.2#2!< 'B1:<' F" !#!)$# 9'<B6::<0 00@B!$"A2 ,'<&%+<BA ! F" !#! $# 9'<B6::<0 00@B!$" '61<<6BA ! F) !#!)$# 9'<B6::<0 00@B!$"A2 ,'<&%+<BA ! ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 39 :3  B#( :! )! $# :1<&'3 :3  B#( :" )! !!$# :1<&'3 :3 !! B#( :" )! !!$# :1<&'3 :3 !! B#( :"! )! !!$# :1<&'3 :3 !! B#( ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 40 <2 "!2  <'B&-AB B<%%A &-%8'1 <2! "!2  <'B&-AB B<%%A &-%8'1 <2" "!2  <'B&-AB B<%%A &-%8'1 <2) "!2  <'B&-AB B<%%A &-%8'1 -2    @6%: ,1)A ;1+%$",!)4) ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 41 :3"<  :() !!" $) :1<@3"< :3"<   :(# ! #$) :1<@3 :3   :(" $   B&1:0'<B6:B& <;A!CA H!%B&';'7 B( !2" (( 9.6:01:6: 8B2(%# 1:A ( ' ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...
  • Page 42 " 2" #)2 ':1&%:1<< &:A(4 #G (C6:1"! $(! " 2" #)# ':1&%:1<< &:A#4 2G "C6:1!2 -$ "")" ',1:B1: 22" ';60 -$ "") ',1:B1: ',B)(A" <%06 ,$    %1 021"A &'01' ViewSonic Corporation VA720-1 Confidential – Do Not Copy VE175/b...

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Ve175/b-1Vlcds23895-3w

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