ViewSonic VG720-1 User Manual Download

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Model No.

S10791-1W

”

Color

TFT LCD

Display

Service Manual

ViewSonic VG720-1

ViewSonic

381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

(

VG720-1_SM

Rev. 1

a Dec. 2005

)

All manuals and user guides at all-guides.com

all-guides.com

Summary of Contents for VG720-1

Page 1: ...Color TFT LCD Display Service Manual ViewSonic VG720 1 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 VG720 1_SM Rev 1a Dec 2005 All manuals and user guides at all guides com...

Page 2: ...respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to...

Page 3: ...iption 5 Adjusting Procedure 6 Trouble Shooting Flow Chart 7 Recommended Spare Parts List 8 Exploded View And Exploded Parts List 9 Block Diagram 10 Schematic Diagrams 11 PCB Layout Diagrams 1 4 7 13...

Page 4: ...ug the monitor before cleaning it Clean the cabinet with a clean dry cloth Apply non ammonia based cleaner onto the cloth not directly onto the glass screen Keep the monitor away from magnetic objects...

Page 5: ...the monitor Do not touch the surface of the polarizer Surface of the LCD panel is pressed by fingers and that may cause Mura Take out the monitor with cushions Taking out the monitor by grasping the L...

Page 6: ...scratch the surface of the panel or cause Mura Place the monitor on the lap the panel surface must be upwards The panel is placed facedown on the lap That may cause Mura 3 ViewSonic Corporation Confid...

Page 7: ...ness 270 cd Typ Response Time 8ms Typ Active Display Area 337 920 H x 270 336 V Maximum Pixel Clock 135 MHz Horizontal Frequency 30 82 kHz Vertical Refresh Rate 50 75 Hz Temperature Operating 0 C to 4...

Page 8: ...video input 3 Blue video input 4 No Connection 5 Ground 6 Red video ground 7 Green video ground 8 Blue video ground 9 5V 10 H V sync ground 11 No connection 12 SDA 13 Horizontal sync Composite sync 1...

Page 9: ...input channel 1 11 GND Logic Ground 12 Reserved 12 Reserved No connection 13 Reserved 13 Reserved No connection 14 VCCX Power 15 GND Logic Ground 16 SENS SENSE Pin Pull High 17 RX0 TMDS negative diffe...

Page 10: ...he highlighted control Also toggles between two controls on some screens Also a shortcut to toggle analog and digital connection Button 2 Displays the control screen for the highlighted control Also t...

Page 11: ...djust the selected option or exit the screen 4 To adjust the setting press the up or down T buttons 5 To save the adjustments and exit the menu press button 1 twice The following tips may help you opt...

Page 12: ...cluding preset color temperatures and a User Color mode which allows independent adjustment of red R green G and blue B The factory setting for this product is 6500K 6500 Kelvin 9300K Adds blue to the...

Page 13: ...that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz Manual Image Adjust Sub menu H Size Horizontal Size adjusts the width of the screen image H V Position Horizontal Vertical Position...

Page 14: ...e user to move the OSD menus and control screens OSD Timeout sets the length of time the OSD screen is displayed For example with a 30 second setting if a control is not pushed within 30 seconds the d...

Page 15: ...Press and hold 2 for 10 seconds If the power button is pressed the message Power Button Locked will display for 5 seconds With or without this setting after a power failure your LCD display s power wi...

Page 16: ...trol logic DDC and DC convert DC circuit and so on Power Board Include adapter inverter Flat Panel and CCFL backlight Main Board Key Board RS232 Connector For white balance adjustment in factory mode...

Page 17: ...C of power supply to about 600 800v AC that drives the backlight It mostly consists of starting circuit PWM controller DC changing circuit LC surging circuit output circuit and protection circuit etc...

Page 18: ...iving strength I O w 5V tolerant 37 DDCD_SCL DDC clock for DVI interface Input w 5V tolerant 19 RST Chip reset High reset Input w 5V tolerant 22 RSTN Chip reset Low reset Input w 5W toerant 11 VCTRL R...

Page 19: ...icient driving speakers as low as 8 range of gain from 40dB to 36 dB The function of each pin and the inside circuit diagram are as follows Circuit Diagram 16 ViewSonic Corporation Confidential Do Not...

Page 20: ...bridge PVVCCL 14 15 Power supply for left channel H bridge tied to pins 22 and 23 internally not connected to PVCCR or AVcc PVVCCL 22 23 Power supply for left channel H bridge tied to pins 14 and 15 i...

Page 21: ...he peak curre nt setpoint is adjusted accordingly to the output power demand Skip cycle occurs when FB falls below Vpin1 3 CS Current sense input This pin senses the primary current and routes it to t...

Page 22: ...resistor 10 2OUT Output 2 3 1IN Positive input for error amplifier 1 11 2DTC Output 2 dead time soft start setting 4 1IN Positive input for error amplifier 2 12 2FBK Error amplifier 2 output 5 1FBK Er...

Page 23: ...4 5 POWER BLOCK FUNCTION DESCRIPTION Inverter Block Function 20 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 24: ...Power Block Function 21 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 25: ...How to do the Chroma 7120 MEM Channel setting A Reference to chroma 7120 user guide B Use SC key and NEXT key to modify xyY value and use ID key to modify the TEXT description Following is the procedu...

Page 26: ...indicator reached the value G 100 6 Adjust the BLUE of color1 on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet...

Page 27: ...up or down arrow on chroma 7120 3 The LCD indicator on chroma 7120 will show x 0 313 0 03 y 0 329 0 03 Y 220 20 cd m2 4 Adjust the RED of color3 on factory window until chroma 7120 indicator reached...

Page 28: ...43 27kHz V 85Hz 800 600 H 53 7kHz V 85Hz 1024 768 H 68 67kHz V 85Hz 1280 1024 H 79 97kHz V 75Hz 4 Test Display Modes Pattern Compatible Modes Analog Digital 640 x 350 70Hz 31 5kHz 640 x 400 70Hz 31 5...

Page 29: ...e 2 3 Boundary Horizontal Vertical Thickness Horizontal and Vertical position of video should be adjustable to be within the screen frame Figure 3 4 RGB Color Performance RGB Color Intensities Contras...

Page 30: ...olor Pattern Figure 4 Figure 3 G Color Pattern Figure 5 B Color Pattern Figure 6 Full White Pattern Figure 7 Dark Screen Pattern Figure 8 27 ViewSonic Corporation Confidential Do Not Copy VG720 1 All...

Page 31: ...DDC Test Pattern EDID program Make sure it can pass test program Fine Tune and Sharpness Test Signal 1280 1024 60Hz Test Pattern Line Moire Pattern Check and see if the image has noise and focus perfo...

Page 32: ...rn White RGB Black Grey Test Tool 10 ND Filter Check if the Mura can pass 10 ND Filter Audio Test Signal Voice signal optional depend on model Test Pattern liberty Make sure there is audio output Make...

Page 33: ...ersion is the latest If not please do the following procedures to upgrade it to the latest version 1 Equipment Needed VG720 VG920 Monitor Fixture for Firmware Upgrade Power Adapter P N 47 58201 001 1...

Page 34: ...the Signal Generator eg Chroma2326 for verifying it after the operation being completed 2 6 Connect PC to the additional monitor 3 Firmware Upgrade Procedure Step 1 Let VG720 VG920 set to be connected...

Page 35: ...tting flame Step 4 Click Connect button On this step if the connection is successful the Entry ISP Mode Dialog will be showed If not the error dialog will be done Step 5 Click Device button Select the...

Page 36: ...ick Auto button Execute the flashing action by clicking the Run button Step 8 If the flashing F W has been completed Ok message will be showed on the right TextBox 33 ViewSonic Corporation Confidentia...

Page 37: ...A Cable 3 2 2 Connect P3 of Fixture with DVI port of VG720 by DVI DVI Cable 3 2 3 Connect P1 of Fixture with Printer port of PC by LPT Cable 3 2 4 Plug Power Adapter to Fixture 3 2 5 Connect Power Cor...

Page 38: ...3 3 DDC Key In Procedure Sep1 Select and execute DDc Key In program 35 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 39: ...Sep2 Inpute the S N and execute Enter 36 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 40: ...37 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 41: ...Sep3 Key the Enter and write the data 38 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 42: ...Sep4 If ddc program OK and show data compare ok 39 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 43: ...5 7 Packing For Shipping 40 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 44: ...SG 41G7801709 4A 1 6 EPE COVER 45G 88609 4 1 7 MONITOR T780KQ6HKGVWABP 1 8 EPE COVER 45G 88609 B 1 9 PE BAG 45G 88607 1 44G3778 1 1 10 EPS 44G3778 2 1 11 AUDIO CABLE 89G 173 56507 1 12 POWER CORD 89G4...

Page 45: ...cture 10 7 Disassemble the 5 screws and 4 pins of the PWPC board remove the PWPC board symbolized the following picture 11 with red color 8 Disassemble the 3 screws and 3 pins of the main board remove...

Page 46: ...ures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Picture 7 Picture 8 43 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com a l l g u i...

Page 47: ...Picture 9 Picture 10 Picture 11 Picture 12 Picture 13 44 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 48: ...Picture 14 Picture 15 Picture 16 Picture 17 Picture 18 Picture 19 Picture 20 45 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 49: ...2 Stand A ssy Disassemble Process Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 46 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 50: ...Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Pictures 12 47 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 51: ...Picture 13 Picture 14 Picture 15 Picture 16 Picture 17 Picture 17 48 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 52: ...6 Troubleshooting Flow Chart 49 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 53: ...548 1 1 31 MAIN FRAME HW 00003744 15G8238 1 1 32 SCREW HW 00003745 M1G 140 10120 5 33 SCREW HW 00003746 M1G1030 6225 1 34 SCREW HW 00003747 M1G1730 6128 4 35 SCREW HW 00003748 Q1G 130 12120 2 36 SCREW...

Page 54: ...00003765 34G1703 KR B STAND REAR 1 30 HW 00003743 37G 548 1 HINGE 1 31 N A 40G 45760819A LABEL 1 32 DC 00003727 40G 459709 1B CARTON LABEL 1 33 DC 00003734 40G 459709 2B S N LABEL 1 34 DC 00003729 40G...

Page 55: ...5 C617 1 100 N A 67G305V100 7N GP 10UF50V KME50VB10 M TP5 C625 1 101 N A 88G 30214K PHONE JACK 5PIN CN601 1 102 N A 90G6119 1 HEATSINK 1 103 N A AUPC980A8SMTP AUPC BOARD SMT 104 E 00003740 56G 616 6 I...

Page 56: ...1 169 N A 88G 35424F H DVID CONN 24P FEMALE 90 CN406 1 170 N A 90G6250 1 GP HEAT SINK 1 171 N A 93G 22 53 CRYSTAL 14 31818MHZ HC 4 X401 1 172 N A AIC780KQ6VWP MAIN BOARD 173 E 00003742 56G 562108 TSUM...

Page 57: ...HM 5 1 10W R408 1 235 N A 61L0603103 CHIPR 10KOHM 5 1 10W R412 1 236 N A 61L0603103 CHIPR 10KOHM 5 1 10W R413 1 237 N A 61L0603103 CHIPR 10KOHM 5 1 10W R415 1 238 N A 61L0603103 CHIPR 10KOHM 5 1 10W R...

Page 58: ...X7R C428 1 305 N A 65G0603104 32 CHIP 0 1UF 50V X7R C429 1 306 N A 65G0603104 32 CHIP 0 1UF 50V X7R C430 1 307 N A 65G0603104 32 CHIP 0 1UF 50V X7R C439 1 308 N A 65G0603104 32 CHIP 0 1UF 50V X7R C44...

Page 59: ...OT 23 D423 1 373 N A 93G 6433P BAV99 SOT 23 D424 1 374 N A 93G 39S 45 T RLZ36B ZENER DIODE D401 1 375 N A 93G 39S 45 T RLZ36B ZENER DIODE D402 1 376 N A 93G 39S 45 T RLZ36B ZENER DIODE D425 1 377 N A...

Page 60: ...B470 M L 1 C203 1 442 N A 67G215L471 4N 470UF25V KY25VB470 M L 1 C925 1 443 N A 67G215L471 4R 470UF 25V C203 1 444 N A 67G215L471 4R 470UF 25V C925 1 445 N A 67G215P102 3K LOW ESR EC 1000UF 16V C924 1...

Page 61: ...R205 1 513 N A 61L0805203 CHIPR 20KOHM 5 1 8W R919 1 514 N A 61L0805220 CHIP 22OHM 5 1 8W R915 1 515 N A 61L0805221 CHIPR 220 OHM 5 1 8W R202 1 516 N A 61L0805221 CHIPR 220 OHM 5 1 8W R916 1 517 N A 6...

Page 62: ...18252T 1 8KOHM 5 1 4W R221 1 581 N A 61G 17218252T 1 8KOHM 5 1 4W R222 1 582 N A 61G 17218252T 1 8KOHM 5 1 4W R223 1 583 N A 61G 17218252T 1 8KOHM 5 1 4W R224 1 584 N A 61G 17256152T 560OHM 5 1 4W R92...

Page 63: ...OIL 630 N A 57G 667 30 2SK2645 54MR TO 220F Q901 1 631 N A 57G 724 11 STP9NK65ZFP TO 220FP MOS Q901 1 632 N A 90G6240 1 HEAT SINK 1 633 N A M1G1730 8128 SCREW 2 634 N A 705G 780 5722P R908 ASS Y 635...

Page 64: ...8 Exploded Diagram and Exploded Parts List Model Title Date Rev ViewSonic Corporation 61 ViewSonic Corporation Confidential Do Not Copy VG720 B All manuals and user guides at all guides com...

Page 65: ...52G6025 11 907 MYLAR SHEET TOP 1 11 N A 52G6025 11 908 MYLAR SHEET BOTTOM 1 12 N A 23G3178709 6A BIRD LOGO E015 006 1 13 N A 23G3178709 4A VIEWSONIC LOGO E015 016 1 1 14 N A 11G800 1 SPACER SUPPORT 1...

Page 66: ...7 KR X SMIVEL COVER 1 8 N A 33G4917 KR X ROLLER 4 9 N A 33G4918 KR X CABLE CLIP 2 10 N A 37G548 1 HINGE 1 11 N A 20G036 1 BASE DIECASTING 1 12 N A 15G8237 1 VESA PLATE 1 13 N A 15G8004 1 ROLLER SHAFT...

Page 67: ...9 Block Diagram 64 ViewSonic Corporation Confidential Do Not Copy VG720 B Scaler TSUM56AK Include ADC OSD MCU etc Flash All manuals and user guides at all guides com...

Page 68: ...R710 NC 12 21 MODIFY R706 NC C719 NC 10uF 16V R722 NC 5V 3 4 R719 NC 10K Q703 PMBS3904 TO 263 R701 1K 1 16W C707 100uF 25V R726 NC 4K7 D704 SSM12L Vf 0 38V and If 1A So when system power on the system...

Page 69: ...D_MPLL 34 AVDD_MPLL 4 VDDP 95 VDDP 103 VDDP 115 VDDC 117 AVDD_ADC 60 GND 13 U401 TSUM57AK C423 22pF GND 1 RST 2 VCC 3 U406 ASM810MEURF T R486 NC PB11 X401 14 318MHz Volume C421 22pF C616 NC ESP 5 PA 0...

Page 70: ...2 D417 BAV99 R449 2 2K 1 16W 3 1 2 D413 BAV70 3 1 2 D418 BAV99 D416 LL5232B 5 6V 5 R470 1K 1 16W C445 0 1uF R446 1K 1 16W R438 75 1 16W R444 10K 1 16W C439 0 1uF R441 100 1 16W R453 100 1 16W 3 1 2 D4...

Page 71: ...10W R210 47K 1 10W ON OFF R228 1K 1 4W C214 12pF 3KV CN201 CONN 1 2 TP1 HVO 1 12V R223 1 8K 1 4W R203 2 4K 1 10W is power GND D207 1N4148 D206 1N4148 D202 1N4148 R221 1 8K 1 4W Q202 DTA144WKA R224 1 8...

Page 72: ...IC903 KIA431A AT P D923 LL4148 GS08 Q902 2PA733P 1 3 2 R900 330K 1 8W ZD901 RLZ18B 1 2 D901 BA159GPT R932 1K 1 10W R917 10K 1 10W R915 22 1 10W R918 0 39 2W R933 2 4K 1 10W C905 0 0015uF 2KV R903 3 3K...

Page 73: ...C621 0 1uF 16V C607 0 01uF C626 0 01uF C629 0 01uF C613 1uF 16V C614 1uF 16V C616 1uF 16V C619 1uF 16V C623 1uF 16V 5 4 1 3 2 CN601 PHONEJACK C624 1uF 16V C610 1uF 16V FB605 600 OHM C643 NC C630 0 001...

Page 74: ...ME LED ORANGE MUTE LED GREEN 1 2 3 4 5 6 7 8 9 10 11 CN001 CONN SW003 SW SW004 SW SW005 SW SW006 SW SW007 SW SW008 SW SW002 SW GND Model Title Date Rev ViewSonic Corporation KEY PAD 71 ViewSonic Corpo...

Page 75: ...11 PCB Layout Diagram 11 1 MAIN BOARD PCB TOP VIEW 72 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 76: ...11 2 MAIN BOARD PCB BUTTON VIEW 73 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 77: ...11 3 KEYBOARD TOP VIEW 11 4 KEYBOARD BUTTON VIEW 74 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 78: ...11 5 POWER PCB TOP VIEW 75 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 79: ...11 6 POWER PCB BUTTON VIEW 76 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 80: ...11 7 AUDIO PCB TOP VIEW 77 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com...

Page 81: ...11 8 AUDIO PCB BUTTON VIEW 78 ViewSonic Corporation Confidential Do Not Copy VG720 1 All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 82: ...marc maupin viewsonic com d o o G t n e l l e c x E Precautions and Safety Notices 1 8 Exploded Diagram and Exploded Parts List 7 Recommended Spare Parts List Adjustment Procedure 2 Specification 5 4...

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