ViewSonic VA720 Service Manual
ViewSonic VA720 - 17" LCD Monitor Manual
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UPC - 766907573237
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ViewSonic VA720 manual content summary:
- ViewSonic VA720 | Service Manual - Page 1
Service Manual ViewSonic VA720-2 Model No. VLCDS23724-2W 17" Color TFT LCD Display (VA720-2_SM_593 Rev. 1a - Jan.. 2004) ViewSonic“ 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 - ViewSonic VA720 | Service Manual - Page 2
, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation. Disclaimer ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of - ViewSonic VA720 | Service Manual - Page 3
5 5. Adjusting Procedure 6 6. Trouble Shooting Flow Chart 7 7. Recommended Spare Parts List 11 8. Exploded Diagram And Spare Parts List 15 9. Block Diagram 18 10. Schematic Diagrams 19 11. PCB Layout Diagrams 21 ViewSonic Corporation ii Confidential - Do Not Copy VA720-2 - ViewSonic VA720 | Service Manual - Page 4
manual for this product. Read all of these instructions. Save these instructions for later use. Follow all warnings and instructions cabinet and other parts. Adequate ventilation must become distorted and the color irregular. Do not allow ViewSonic Corporation Confidential - Do Not Copy VA720-2 1 - ViewSonic VA720 | Service Manual - Page 5
2.1. PRODUCT SPECIFICATIONS LCD panel type Power Consumption Displayable Resolution Pixel dimension Display Color Viewing Angle (CR≥10) Response Time Contrast Ratio Brightness Active Display Area AC/DC adapter Dimensions ( WxHxD ) Weight (Net / Gross) Input connector Power management Temperature 17 - ViewSonic VA720 | Service Manual - Page 6
SUPPORTING 768 @ 75Hz, 60.241kHz, 17. VESA 1280 x 1024 @ LCD's video connector. Video Signal Green Video Signal Blue Video Signal N.C. Ground Ground Ground Ground +5v Ground N.C. DDC data Horizontal sync signal Vertical sync signal DDC clock ViewSonic Corporation Confidential - Do Not Copy VA720 - ViewSonic VA720 | Service Manual - Page 7
and plug the AC cord. 14) ISP mode:First, power off the monitor, unplug the AC cord, then press "2" and "Power " and "down" key at the same time and plug the AC cord. 15) AUTO color: then press "1" and "" and "" key at the same time. ViewSonic Corporation Confidential - Do Not Copy VA720-2 4 - ViewSonic VA720 | Service Manual - Page 8
gm2121 is a graphics processing IC for Liquid Crystal Display (LCD) monitor at SXGA resolution . It provides a high-speed triple-ADC and PLL,a high quality zoom and shrink scaling engine , an on-screen display (OSD) controller, digital color controls, an on-chip micro-controller ( OCM ) and industry - ViewSonic VA720 | Service Manual - Page 9
tunes the video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image. First, power off the monitor, un-plug the AC cord and be sure the signal cable is connected (D-sub connected) , then press "2" key at the same time and plug the AC cord to factory. ViewSonic - ViewSonic VA720 | Service Manual - Page 10
YES NO ON Back-light On or off? OFF Check power LED GREEN ORANGE A dark picture or a picture full of colorfully vertical lines Hsync,Vsync or DE error Check display resolution Check I/F board Check inverter Check I/F board CN1 Check LCD cable Check I/F board CN1 Check LCD panel J1 OSD no - ViewSonic VA720 | Service Manual - Page 11
YES END REPLACE U6 INPUT CKT INPUT CKT START YES OK Check U2 O/P Data NO YES TO gm2121 CKT YES CHECK I/P R,G & B Video, HSYNC(pin 101),VSYNC(pin 100) U5 to U2 Signal NO CHECK Flash memory U5 CKT,D_SUB connector And U6(74LVC14) ViewSonic Corporation Confidential - Do Not Copy VA720-2 8 - ViewSonic VA720 | Service Manual - Page 12
YES CHECK U5 (pin2~12 C ,23,25~29) ADDRESS ; (pin13~15,17~21) DATA YES SIGNAL END NO YES CHECK U3 RESET(pin 2),X1 (14.318MHZ ) SIGNAL NO CHECK U5 OK OR REPLACE GM2121 CKT U4 NO CHECK FLASH MEMORY INPUT & H&V BUFFER CKT ViewSonic Corporation Confidential - Do Not Copy VA720-2 9 - ViewSonic VA720 | Service Manual - Page 13
U2 YES END MENU/KEY GPIO17(pin 13) UP/KEY GPIO16(pin 9) SELECT/KEY GPIO22(pin 8) DOWN/KEY GPIO21(pin 16) POWER/KEY GPIO9 (pin 33) PANEL POWER CKT PANEL POWER CKT START YES YES CHECK PNL_VCC,FB2 END NO CHECK POWER CKT YES +5V ViewSonic Corporation Confidential - Do Not Copy VA720-2 10 - ViewSonic VA720 | Service Manual - Page 14
Parts List Recommended Spare Parts List VA720-2 Item ViewSonic P/N Ref. P/N Description Location Q'ty 1 B-IF-0222-0046 DPWBN5415T8---A I/F BOARD I/F BOARD 1 2 A-AD-0114-0146 RUNTP5459T8---- AC/DC ADAPTER AC/DC ADAPTER 1 3 A-VC-0101-0253 QCODS1492T8D--A VGA CABLE 1.8M VGA CABLE - ViewSonic VA720 | Service Manual - Page 15
LIST FOR VA720-2 Item ViewSonic P/N INVERTER SHIELD*4 PC PLATE ADHESIVE TYPE 0.05M*3,0.1*1 6BIT A MINUS PANEL (17"AU) 6BIT A MINUS PANEL (17"AU) AC/AD ADAPTER(HJC 4A 1.65) MODEL LABEL AC POWER CORD EU 1.8M BLACK VGA CABLE 1.8M FOR PC99 AC POWER CORD(1.8M)USA UPC LABEL S/N LABEL USER'S MANUAL COLOR - ViewSonic VA720 | Service Manual - Page 16
Power PMOSFET IC SI4435DYTR INVERTER Gate IC SN74LV14A Transistor,2N3904,(NPN T.R VCEO=40VAC) Transistor,MMBT3904T,(NPN T.R VCEO=40VAC) Transistor,MMBT3904LT,(NPN T.R VCEO=40VAC) Transistor,2N3906,(PNP T.R VCEO=40VAC) Connector 30 PIN,FI-SE30P-HF Connector 30 PIN,FI-S30P-HF FUSE, 4A/125V RESET - ViewSonic VA720 | Service Manual - Page 17
SB-0221-0505 TLAB-3547T8---- MODEL: CPWBGA720T8ACEB 1 M-LCD-0826-0137 VVLM170EN05--N- 2 B-SB-0221-0483 RUNTP5469T8---- A MINUS PANEL(17"AU) FOR AU 17" SIDE MOUNT INVERTER I/F BOARD (FOR GENESS) LVDS CABLE CD DRIVER MAIN BRACKET PANEL ViewSonic Corporation Confidential - Do Not Copy VA720-2 14 - ViewSonic VA720 | Service Manual - Page 18
8. Exploded Diagram And Spare Parts List 25 ViewSonic Corporation 23 27 26 25 33 28 26 32 24 24 31 EXPLODED DRAWING FOR VA720-2 (AU side mount panel) 29 30 29 Confidential - Do Not Copy VA720-2 15 - ViewSonic VA720 | Service Manual - Page 19
PACKING METHOD 2 1 2 3 7 5 4 6 8 9 ViewSonic Corporation Confidential - Do Not Copy VA720-2 16 - ViewSonic VA720 | Service Manual - Page 20
B-IF-0222-0047 17 M-LCD-0826-0137 18 VA720-2 Exploded Parts INVERTER PCB SHIELD CASE(INVERTER Black) HEX-ROD FOR VGA CONNECTOR SCREW(PAN HEAD-Washer-3*8-Bronze) Q'TY 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1 1 1 1 1 1 11 14 6 14 3 4 5 4 2 2 1 ViewSonic Corporation Confidential - Do Not Copy VA720-2 17 - ViewSonic VA720 | Service Manual - Page 21
DDC EPROM 24C21A (U12) FLASH (U5) JP3 TO INVERTER JP2 SWITCH MODE POWER SUPPLY 12V 2.5V 5V CN4 SW BOARDJP7 DPWBN5415T8---A FROM A/D ADAPTOR C CON1 C O O N INVERTER N 3 RUNTPC5O4N619T8---- 2 C 0 17" LCD N PANEL 1 ViewSonic Corporation Confidential - Do Not Copy VA720-2 18 - ViewSonic VA720 | Service Manual - Page 22
U3 3 MR RESET 2 4 VCC GND 1 MAX811 GND /RESET ROM_WEn R9 R10 R- C43 G- C44 B- C45 100 100 R11 0.01uF 0.01uF 0.01uF REDGREENBLUE- HSYNC VSYNC RED+ GREEN+ BLUE+ 17 35 RESETn GND 10pF GND Title A GND GND GND 5 4 3 2 1 ViewSonic Corporation Confidential - Do Not Copy VA720-2 19 - ViewSonic VA720 | Service Manual - Page 23
MMBT3904L 30/100M(0603) C72 C73 1uF 0.01uF INVERTER CON +5V GND GND GND E 470uF U8 1uF/0603 1uF/0603 POWER/KEY FB23 30/100M(0603) 9 GREEN POWER-KEY 10 POWER GPO 1 R58 1k 22 21 20 19 18 17 16 15 RIGHT_OUT+ RIGHT_OUT- ViewSonic Corporation Confidential - Do Not Copy VA720-2 20 - ViewSonic VA720 | Service Manual - Page 24
11.PCB LAYOUT MIN BOARD ViewSonic Corporation Confidential - Do Not Copy VA720-2 21 - ViewSonic VA720 | Service Manual - Page 25
SW BOARD ViewSonic Corporation Confidential - Do Not Copy VA720-2 22 - ViewSonic VA720 | Service Manual - Page 26
VA720-2 Service Manual? Unit 1. Precautions And Safety Notices 2. Specification Excellent Good Fair Bad 3. Front Panel Function Control Description 4. Circuit Description 5. Adjusting Procedure 6. Trouble Shooting Flow Chart 7. Recommended Spare Parts List 8. Exploded Diagram and Spare Parts
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Model No.
V
L
CD
S
23724-
2
W
1
7
”
Color
TFT LCD Display
Service Manual
ViewSonic
V
A
7
2
0-
2
ViewSonic
381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
(
V
A
7
2
0-
2
_
SM_
593
Rev. 1a –
Jan.
.
2004
)