ViewSonic VG720 - 17" LCD Monitor User Manual Download

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ViewSonic Corporation

Confidential - Do Not Copy

VG720

Manufacture Date: Aug-10-05

Service Manual

ViewSonic VG720

Model No VS10791

17” Color TFT LCD Display

Summary of Contents for VG720 - 17" LCD Monitor

Page 1: ...1 ViewSonic Corporation Confidential Do Not Copy VG720 Manufacture Date Aug 10 05 Service Manual ViewSonic VG720 Model No VS10791 17 Color TFT LCD Display...

Page 2: ...of merchantability of fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation...

Page 3: ...Specification 7 3 Front Panel Control And Indicators 10 4 Circuit Description 16 5 Adjustment Procedure 23 6 Troubleshooting Flow Chart 43 7 Recommended Spare Parts List 44 8 Exploded Diagram And Spa...

Page 4: ...plug the power cable immediately and consult your service technician Always unplug the monitor before cleaning it Clean the cabinet with a clean dry cloth Apply non ammonia based cleaner onto the clot...

Page 5: ...rrect Methods Only touch the metal frame of the LCD panel or the front cover of the monitor Do not touch the surface of the polarizer Surface of the LCD panel is pressed by fingers and that may cause...

Page 6: ...the monitor on a clean and soft foam pad Placing the monitor on foreign objects That could scratch the surface of the panel or cause Mura Place the monitor on the lap the panel surface must be upward...

Page 7: ...C data Viewing Angle Horizontal 140 Vertical 125 Contrast Ratio 600 1 Typ Brightness 270 cd Typ Response Time 8ms Typ Active Display Area 337 920 H x 270 336 V Maximum Pixel Clock 135 MHz Horizontal F...

Page 8: ...OR 1 5 6 10 11 15 SIGNAL LEVEL Pin Number Pin Function 1 Red video input 2 Green video input 3 Blue video input 4 No Connection 5 Ground 6 Red video ground 7 Green video ground 8 Blue video ground 9 5...

Page 9: ...X1 TMDS negative differential input channel 1 10 RX1 TMDS positive differential input channel 1 11 GND Logic Ground 12 Reserved 12 Reserved No connection 13 Reserved 13 Reserved No connection 14 VCCX...

Page 10: ...display the Contrast adjustment control screen Displays the control screen for the highlighted control Also toggles between two controls on some screens Also a shortcut to toggle analog and digital co...

Page 11: ...ntrol screen tells what to do next from this screen You can toggle between control screens adjust the selected option or exit the screen 4 To adjust the setting press the up or down T buttons 5 To sav...

Page 12: ...ly silences audio output Color Adjust provides several color adjustment modes including preset color temperatures and a User Color mode which allows independent adjustment of red R green G and blue B...

Page 13: ...nd refresh rate vertical frequency NOTE VESA 1280 x 1024 60Hz recommended means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz Manual Image Adjust Sub menu H Size Horizontal Size...

Page 14: ...lution other than 1280 x 1024 the following screen appears OSD Position allows the user to move the OSD menus and control screens OSD Timeout sets the length of time the OSD screen is displayed For ex...

Page 15: ...or 640x400 mode 1 X White Balance Not shown on user s guide 2 Power Button Lock Press and hold 2 for 10 seconds If the power button is pressed the message Power Button Locked will display for 5 second...

Page 16: ...N BOARD BLOCK FUNCTION DESCRIPTION The main board contains panel control logic brightness control logic DDC and DC convert DC circuit and so on Power Board Include adapter inverter Flat Panel and CCFL...

Page 17: ...in the main board and inverter Inverter is DC TO AC circuit It changes the 12v DC of power supply to about 600 800v AC that drives the backlight It mostly consists of starting circuit PWM controller...

Page 18: ...transmitter GPIO Input w 5V tolrant 36 DDCD_SDA DDC data for DVI interface 4mA driving strength I O w 5V tolerant 37 DDCD_SCL DDC clock for DVI interface Input w 5V tolerant 19 RST Chip reset High res...

Page 19: ...al Do Not Copy VG720 TPA3003D2 U601 The TPA3003D2 is a audio amplifier IC 3 W efficient driving speakers as low as 8 range of gain from 40dB to 36 dB The function of each pin and the inside circuit di...

Page 20: ...r ground for left channel H bridge PGNDR 42 43 Power ground for right channel H bridge PVVCCL 14 15 Power supply for left channel H bridge tied to pins 22 and 23 internally not connected to PVCCR or A...

Page 21: ...cycle feature 2 FB Sets the peak current setpoint By connecting an optocoupler to this pin the peak current setpoint is adjusted accordingly to the output power demand Skip cycle occurs when FB falls...

Page 22: ...scription 1 CT External timing capacitor 9 VCC Power supply 2 RT External timing resistor 10 2OUT Output 2 3 1IN Positive input for error amplifier 1 11 2DTC Output 2 dead time soft start setting 4 1I...

Page 23: ...r warm up before proceeding White Balance adjustment 1 Adjust of White Balance 1 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...

Page 24: ...tor reached the value R 100 5 Adjust the GREEN of color1 on factory window until chroma 7120 indicator reached the value G 100 6 Adjust the BLUE of color1 on factory window until chroma 7120 indicator...

Page 25: ...20 to RGB Mode with press MODE button 2 Switch the MEM channel to Channel 10 with 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...

Page 26: ...ture b With full white screen RGB and Black c With cycled display modes 640 480 H 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 P...

Page 27: ...rast Bright ness 16 Gray Scale 16 gray levels sh should be distinguishable Figure 2 3 Boundary Horizontal Vertical Thickness Horizontal and Vertical position of video should be adjustable to be within...

Page 28: ...oration Confidential Do Not Copy VG720 Horizontal Vertical Thickness Pattern R Color Pattern Figure 4 Figure 3 G Color Pattern Figure 5 B Color Pattern Figure 6 Full White Pattern Figure 7 Dark Screen...

Page 29: ...efer to Chapter III 3 Hot Keys for Function Controls Make sure the F W is the latest version DDC Test Pattern EDID program Make sure it can pass test program Fine Tune and Sharpness Test Signal 1280 1...

Page 30: ...rs and distance of dead pixels should be compliant with the spec Mura Test Pattern White RGB Black Grey Test Tool 10 ND Filter Check if the Mura can pass 10 ND Filter Audio Test Signal Voice signal op...

Page 31: ...cedure When you receive the returned monitor please check whether the firmware version is the latest If not please do the following procedures to upgrade it to the latest version 1 Equipment Needed VG...

Page 32: ...pter to Fixture 2 4 Connect Power Cord to VG720 VG920 Monitor 2 5 Connect P3 to the Signal Generator eg Chroma2326 for verifying it after the operation being completed 2 6 Connect PC to the additional...

Page 33: ...dr 0x378 on Communication Setting flame and then the Speed 47 on E2PROM Device Setting flame Step 4 Click Connect button On this step if the connection is successful the Entry ISP Mode Dialog will be...

Page 34: ...Step 6 Click Read button Select the object bincode on your corresponding directory Step 7 Click Auto button Execute the flashing action by clicking the Run button Step 8 If the flashing F W has been...

Page 35: ...edure 3 2 1 Connect P2 and P4 of Fixture with VGA ports of VG720 VG720 VG920by VGA 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 po...

Page 36: ...36 ViewSonic Corporation Confidential Do Not Copy VG720 3 3 DDC Key In Procedure Sep1 Select and execute DDc Key In program...

Page 37: ...37 ViewSonic Corporation Confidential Do Not Copy VG720 Sep2 Inpute the S N and execute Enter...

Page 38: ...38 ViewSonic Corporation Confidential Do Not Copy VG720...

Page 39: ...39 ViewSonic Corporation Confidential Do Not Copy VG720 Sep3 Key the Enter and write the data...

Page 40: ...40 ViewSonic Corporation Confidential Do Not Copy VG720 Sep4 If ddc program OK and show data compare ok...

Page 41: ...41 ViewSonic Corporation Confidential Do Not Copy VG720 5 7 Packing For Shipping...

Page 42: ...1 2 HANDLE2 50G 600 3 1 3 PE BAG 45G 76 28 V3 1 4 CD MANUAL 70G1701709 5B 1 5 QSG 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...

Page 43: ...43 ViewSonic Corporation Confidential Do Not Copy VG720 6 Troubleshooting Flow Chart...

Page 44: ...FRAME 1 14 15G8239 1 Kensington bracket 1 15 19G6014 2 0 2 16 20G 036 1 BASE DIE CASTING 1 17 23G3178709 4A VSC17 LCD FRONT LOGO 1 18 23G3178709 6A BIRD LOGO E015 006 1 19 33G4915 KR L FUNCTION BUTTON...

Page 45: ...53 45G 76 28 V3 PE BAG 1 54 45G 77 3 TRANSPARENT SHEET 173 55 45G 88607 PE BAG 1 56 45G 88609 4 EPE COVER 1 57 45G 88609 B EPE COVER 1 58 50G 600 1 W 74 59 50G 600 2 HANDLE1 1 60 50G 600 3 HANDLE2 1...

Page 46: ...MM 4 98 Q1G 330 6120 SCREW M3X6MM 2 99 Q1G 330 8120 SCREW 2 100 Q1G1030 10120 M3 10 4 101 Q1G1030 12120 M3 12 2 102 750GLQ70L07 61 LCD PANEL QD17EL07 Rev1 1 103 750GLQ70L07 62 QD17EL07 17 LCD PANEL 0...

Page 47: ...32 CHIP 1000PF 50 X7R C631 1 135 65G0603102 32 CHIP 1000PF 50 X7R C632 1 136 65G0603103 32 0 01UF 50V X7R C607 1 137 65G0603103 32 0 01UF 50V X7R C608 1 138 65G0603103 32 0 01UF 50V X7R C626 1 139 65G...

Page 48: ...C 100UF 25V NC C712 1 177 67G309V100 3 Electrolytic CAP C408 1 178 67G309V100 3 Electrolytic CAP C717 1 179 67G309V109 3 1UF 20 16V C705 1 180 67G309V479 3 4 7UF 20 16V C403 1 181 67G309V479 3 4 7UF 2...

Page 49: ...1 10W R464 1 217 61L0603100 CHIPR 10 OHM 1 10W R465 1 218 61L0603100 CHIPR 10 OHM 1 10W R466 1 219 61L0603100 CHIPR 10 OHM 1 10W R467 1 220 61L0603100 CHIPR 10 OHM 1 10W R468 1 221 61L0603100 CHIPR 1...

Page 50: ...1L0603103 CHIPR 10KOHM 5 1 10W R450 1 257 61L0603103 CHIPR 10KOHM 5 1 10W R451 1 258 61L0603103 CHIPR 10KOHM 5 1 10W R452 1 259 61L0603103 CHIPR 10KOHM 5 1 10W R457 1 260 61L0603103 CHIPR 10KOHM 5 1 1...

Page 51: ...HM 5 1 10W R439 1 297 61L0603750 CHIPR 75OHM 5 1 10W R440 1 298 65G0603104 32 CHIP 0 1UF 50V X7R C401 1 299 65G0603104 32 CHIP 0 1UF 50V X7R C404 1 300 65G0603104 32 CHIP 0 1UF 50V X7R C405 1 301 65G0...

Page 52: ...X7R C454 1 336 65G0603104 32 CHIP 0 1UF 50V X7R C706 1 337 65G0603104 32 CHIP 0 1UF 50V X7R C709 1 338 65G0603104 32 CHIP 0 1UF 50V X7R C711 1 339 65G0603104 32 CHIP 0 1UF 50V X7R C713 1 340 65G060310...

Page 53: ...6 1 375 93G 39147SEM ZMM5V6 D426 1 376 93G 39149 ZENER MLL5232B BY FULL D406 1 377 93G 39149 ZENER MLL5232B BY FULL D408 1 378 93G 39149 ZENER MLL5232B BY FULL D409 1 379 93G 39149 ZENER MLL5232B BY F...

Page 54: ...TP MAIN BOARD FOR SMT 1 416 33G8021 2D U CON 2PR A CN201 1 417 33G8021 2D U CON 2PR A CN202 1 418 33G8021 2D U CON 2PR A CN203 1 419 33G8021 2D U CON 2PR A CN204 1 420 33G8021 2D AC WAFER CN201 0 421...

Page 55: ...BY UK C900 0 455 67G215H102 3N KY16VB1000M 1 10 20 C924 0 456 67G215L101 4N LOW ESR EC 100UF 25V NC C906 1 457 67G215L102 3N KY16VB1000M 1 10 20 C924 0 458 67G215L102 3R LOW ESR 1000UF 20 16 C924 1 45...

Page 56: ...6 LS CHOCK COIL L201 0 494 73G 253166 YS CHOKE L201 1 495 73L 174 50 LH LINE FILTER L901 1 496 73L 174 50LSH LINE FILTER L901 0 497 80GL17T 28 DN TRANSFORMER PT201 0 498 80GL17T 28 DN TRANSFORMER PT20...

Page 57: ...23 CHIP 12K OHM 1 8W R214 1 535 61L0805123 CHIP 12K OHM 1 8W R231 1 536 61L0805163 CHIP 16KOHM 1 8W R205 1 537 61L0805203 CHIPR 20KOHM 5 1 8W R919 1 538 61L0805220 CHIP 22OHM 5 1 8W R915 1 539 61L0805...

Page 58: ...0 1UF 50V X7R 0805 C928 1 574 65G0805104 32 CHIP 0 1UF 50V X7R 0805 C929 1 575 65G0805105 22 CHIP 1UF 25V X7R 0805 C205 1 576 65G0805105 22 CHIP 1UF 25V X7R 0805 C210 1 577 65G0805105 22 CHIP 1UF 25V...

Page 59: ...INCOATEDCOPPER J912 1 615 95G 90 23 TINCOATEDCOPPER J915 1 616 95G 90 23 TINCOATEDCOPPER J916 1 617 95G 90 23 TINCOATEDCOPPER J917 1 618 95G 90 23 TINCOATEDCOPPER J918 1 619 95G 90 23 TINCOATEDCOPPER...

Page 60: ...G6240 2 HEAT SINK 1 652 93G 60236 FMB 26L TO 220 DIODE D922 1 653 93G 60238 DIODE 10A 150V FCH10A15 D921 0 654 93G 60239 DIODE FME 210B TO 220 D921 1 655 93G1506 2 DIODE 15A 60V FMW 2156 D922 0 656 M1...

Page 61: ...61 ViewSonic Corporation Confidential Do Not Copy VG720 8 Exploded Diagram And Spare Parts List...

Page 62: ...62 ViewSonic Corporation Confidential Do Not Copy VG720...

Page 63: ...63 ViewSonic Corporation Confidential Do Not Copy VG720...

Page 64: ...shield remove the shield as the direction arrowhead showed refer to the following picture 10 7 Disassemble the 5 screws and 4 pins of the PWPC board remove the PWPC board symbolized the following pict...

Page 65: ...65 ViewSonic Corporation Confidential Do Not Copy VG720 9 1 3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Picture 7 Picture 8...

Page 66: ...66 ViewSonic Corporation Confidential Do Not Copy VG720 Picture 9 Picture 10 Picture 11 Picture 12 Picture 13...

Page 67: ...67 ViewSonic Corporation Confidential Do Not Copy VG720 Picture 14 Picture 15 Picture 16 Picture 17 Picture 18 Picture 19 Picture 20...

Page 68: ...68 ViewSonic Corporation Confidential Do Not Copy VG720 9 2 Stand A ssy Disassemble Process Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6...

Page 69: ...69 ViewSonic Corporation Confidential Do Not Copy VG720 Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Pictures 12...

Page 70: ...70 ViewSonic Corporation Confidential Do Not Copy VG720 Picture 13 Picture 14 Picture 15 Picture 16 Picture 17 Picture 17...

Page 71: ...71 ViewSonic Corporation Confidential Do Not Copy VG720 10 Block Diagram Scaler TSUM56AK Include ADC OSD MCU etc Flash...

Page 72: ...0 GND R724 51K GND GND C714 0 1uF 3 1 2 D703 BAT54C For RSDS and Panel VCC 12V Q707 PMBS3904 12V C716 0 1uF 12V 5V 12V 4 Q705 AO3401L 5V R732 10 1 16W R712 4 7K 1 16W R715 NC R710 NC 12 21 MODIFY R706...

Page 73: ...IO_P02 SAR3 25 GPIO_P03 26 GPIO_P22 75 GPIO_P23 74 AVDD_PLL 52 AVDD_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...

Page 74: ...C443 220pF 3 1 2 D421 BAV99 C432 0 047uF R447 1K 1 16W R436 56 1 16W R451 10K 1 16W 3 1 2 D422 BAV99 FB409 120 OHM D410 MLL5232B 5 6V R445 100 1 16W 3 1 2 D417 BAV99 R449 2 2K 1 16W 3 1 2 D413 BAV70...

Page 75: ...itle Size Document Number Rev Date Sheet of R207 10K 1 10W D205 1N4148 Q206 KTC5103L Y U P C203 470uF 25V C211 12pF 3KV Q203 AOU401L 2 1 3 TP2 HVO 1 R214 12K 1 10W C208 0 1uF 25V R232 51K 1 10W R202 2...

Page 76: ...D921 FME 210B 1 2 3 5V R925 0 1 8W 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...

Page 77: ...V C627 0 1uF 16V GND GND FB608 600 OHM C628 0 1uF 16V 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...

Page 78: ...2 LED001 LED KEY UP GND VOLUME VOLUME 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 Title Size Document Number Rev Date Sheet of C...

Page 79: ...79 ViewSonic Corporation Confidential Do Not Copy VG720 12 PCB Layout Diagram 12 1 MAIN BOARD PCB TOP VIEW...

Page 80: ...80 ViewSonic Corporation Confidential Do Not Copy VG720 12 2 MAIN BOARD PCB BUTTON VIEW...

Page 81: ...81 ViewSonic Corporation Confidential Do Not Copy VG720 12 3 KEYBOARD TOP VIEW 12 4 KEYBOARD BUTTON VIEW...

Page 82: ...82 ViewSonic Corporation Confidential Do Not Copy VG720 12 5 POWER PCB TOP VIEW...

Page 83: ...83 ViewSonic Corporation Confidential Do Not Copy VG720 12 6 POWER PCB BUTTON VIEW...

Page 84: ...84 ViewSonic Corporation Confidential Do Not Copy VG720 12 6 AUDIO PCB TOP VIEW...

Page 85: ...85 ViewSonic Corporation Confidential Do Not Copy VG720 12 6 AUDIO PCB BUTTON VIEW...

Page 86: ...ors 4 Circuit Description 5 Adjustment Procedure 6 Troubleshooting Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram And Spare Parts List 9 Block Diagram 10 Schematic Diagram 11 PCB Layout...

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