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Summary of Contents for ViewSonic VA720-2
- 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...
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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 Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 4: Precautions And Safety Notices
This product should never be placed near or over a radiator or heat register. This product should not be placed in a built-in installation unless proper ventilation is provided. Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 5: Specification
5.4 / 7.6 kg (unit) Weight (Net / Gross) 15 Pin D-Sub. Input connector Power management Temperature Operating : 0 ° C ~ +40 ° C Storage : -20 ° C ~ +60 ° C Confidential - Do Not Copy ViewSonic Corporation VA720-2... - Page 6 This section describes the pin assignment of the LCD’s video connector. It is called 15 Pin Mini D-sub Connector. Pin NO. Signal Connector Red Video Signal Green Video Signal Blue Video Signal N.C. Ground Ground Ground Ground Ground N.C. DDC data Horizontal sync signal Vertical sync signal DDC clock Confidential - Do Not Copy ViewSonic Corporation VA720-2...
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Page 7: Front Panel Function Control Description
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. Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 8: Circuit Description
LCD panel . A 10-bit output results in an improved color depth control. The 10-bit output is then dithered down to 8 bits( or 6 bits) per channel at the display . Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 9: Adjusting Procedure
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. Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 10: Trouble Shooting Flow Chart
Partial picture without Color RGB SIGNAL Check signal cable ERROR Check I/F board Vertical,Horizontal Check LCD panel None synchronousness A few of colorfully Vertical lines Check LCD panel Even(or odd) vertical Line is dark Confidential - Do Not Copy ViewSonic Corporation VA720-2... - Page 11 INPUT CKT START TO gm2121 REPLACE U6 Check U2 O/P Data CHECK I/P R,G & B Video, HSYNC(pin 101),VSYNC(pin 100) U5 to U2 Signal CHECK Flash memory U5 CKT,D_SUB connector And U6(74LVC14) Confidential - Do Not Copy ViewSonic Corporation VA720-2...
- Page 12 And RXO3+ , RXO3- , RXO2+ , RXO2- , RXO1+ , RXO1- , RXO0+ , RXO0- , RXOC+ , RXOC- CHECK U6 INPUT REPLACE U4 CHECK U4 I2C SIGNAL CHECK FLASH MEMORY INPUT & H&V BUFFER Confidential - Do Not Copy ViewSonic Corporation VA720-2...
- Page 13 CHECK OSD UP/KEY REPLACE U2 GPIO16(pin 9) OSD SWITCH CABLE SELECT/KEY GPIO22(pin 8) DOWN/KEY GPIO21(pin 16) POWER/KEY GPIO9 (pin 33) PANEL POWER CKT PANEL POWER CKT START CHECK PNL_VCC,FB2 CHECK POWER CKT Confidential - Do Not Copy ViewSonic Corporation VA720-2...
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Page 14: Recommended Spare Parts List
7. Recommended Spare Parts List Recommended Spare Parts List VA720-2 Item ViewSonic P/N Ref. P/N Description Location Q'ty DPWBN5415T8---A I/F BOARD I/F BOARD B-IF-0222-0046 RUNTP5459T8---- AC/DC ADAPTER AC/DC ADAPTER A-AD-0114-0146 QCODS1492T8D--A VGA CABLE 1.8M VGA CABLE 1.8M A-VC-0101-0253 QACC-1126D8D--- AC POWER CORD 1.8M AC POWER CORD 1.8M... - Page 15 BOM LIST FOR VA720-2 Item ViewSonic P/N Ref. P/N Description Location Q'ty C-BS-0303-0299 GSTN-2870D8F--A SPRAY PAINT SPRAY PAINT 1PCS M-MS-0808-8124 MHNGM0019D8---- HINGE HINGE 1PCS M-MS-0808-8901 LANGF2052D8---A BASE PLATE BASE PLATE 1PCS M-SCW-0824-6737 XESSD30P06000-- BASE PLATE/BASE*5 BASE PLATE/BASE*5 5PCS M-SCW-0824-6736 XBSSD40P12000--...
- Page 16 Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A RCRSL1088T8---- OSC(14.318 MHZ) SECOND SOURCE 1PCS E-X-0415-0139 RCRSL1255T8---- OSC(14.318 MHZ) SECOND SOURCE 1PCS #N/A RCHOL1098T8640- CHOKE 64UH 1PCS #N/A RCHOL1100T8640- CHOKE 64UH SECOND SOURCE 1PCS #N/A QJAKD1018T8D--- POWER JACK 1PCS #N/A...
- Page 17 Item ViewSonic P/N Ref. P/N Description Location Q'ty #N/A VRMDNVG--472J-A Resistor,SMT,0603,4.7KΩ,±5%,1/16W 1PCS #N/A VRMDNVG--471J-A Resistor,SMT,0603,470Ω,±5%,1/16W R49,50 2PCS #N/A VRMDNVG--750J-A Resistor,SMT,0603,75Ω,±5%,1/16W R31,32,33 3PCS #N/A VCLFHN1HG104Z-A Capacitor,SMT,0603,50V,0.1U C2,3,4,5,6,7,8,9,12,15, 10PCS #N/A VCLFHN1HG104Z-A Capacitor,SMT,0603,50V,0.1U C16,17,18,19,20,24,25,26,27,28, 10PCS #N/A VCLFHN1HG104Z-A Capacitor,SMT,0603,50V,0.1U C29,31,32,33,34,35,37,38,42,46, 10PCS #N/A VCLFHN1HG104Z-A Capacitor,SMT,0603,50V,0.1U...
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Page 18: Exploded Diagram And Spare Parts List
8. Exploded Diagram And Spare Parts List EXPLODED DRAWING FOR VA720-2 (AU side mount panel) Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 19: Packing Method
PACKING METHOD Confidential - Do Not Copy ViewSonic Corporation VA720-2... - Page 20 VA720-2 Exploded Parts List Item ViewSonic P/N Ref. P/N Description Q'TY C-FP-0301-0912 GCABA2301D8F--B FRONT COVER M-MS-0808-9174 LENS HDECP1929D8F--- PL-NB-0707-0170 FUNCTION KNOB JKNBP2309D8F--- B-IF-0222-0046 FUNCTION PCB DPWBN5415T8---A M-BK-0805-0062 MAIN BRACKET LANGF2086D8---E M-BK-0805-0053 LANGF2066D8---- BRACKET(MAIN-SUB) C-BS-0303-0299 GSTN-2870D8F--A BASE M-MS-0808-8124 MHNGM0019D8---- HINGE M-MS-0808-8901...
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Page 21: Block Diagram
CN1 30 PIN GM2121 GRAPHIC LVDS CABEL (DB15) (U2) EPROM 24C21A (U12) FLASH (U5) INVERTER SWITCH MODE POWER SUPPLY 2.5V FROM A/D ADAPTOR SW BOARD DPWBN5415T8---A CON1 INVERTER 17” LCD RUNTP5469T8---- CON1 PANEL Confidential - Do Not Copy ViewSonic Corporation VA720-2... -
Page 22: Schematic Diagrams
VERY CLOSE TO VGA (DB-15 INPUT),REV:C remodify C111 VGA-SDA HS-IN VSYNC 10pF A-HS VS-IN A-VS VGA-SCL Title 74LVC14 A-VS 5.6V 2.2K 2.2K 22pF 22pF 5.6V 5.6V 5.6V REV:A至REV:B GROUND remodify rev:C PLANE於RGB信號進入SCALER之前割㆞. Confidential - Do Not Copy ViewSonic Corporation VA720-2... - Page 23 MTG3 THROUGH HOLE MTG4 THROUGH HOLE MTG5 THROUGH HOLE DDC-SCL DDC-SDA VGA-SCL VGA-SDA POWER/AUDIO GPO 0 24C21 MMBT3904L ANALOG DDC 24C02 use 30/100M(0603) FB27 FB28 70/100M(1812) 24C21 use FB29 30/100M(0603) AGND A-VS Confidential - Do Not Copy ViewSonic Corporation VA720-2...
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Page 24: Pcb Layout Diagrams
11.PCB LAYOUT MIN BOARD Confidential - Do Not Copy ViewSonic Corporation VA720-2... - Page 25 SW BOARD Confidential - Do Not Copy ViewSonic Corporation VA720-2...
- Page 26 *Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual,which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation Assessment A.What do you think about the content after reading VA720-2 Service Manual?
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