ViewSonic VA712b-2 Service Manual Download Page 17

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ViewSonic Corporation

4. Circuit Description

4.1 LCD MONITOR DESCRIPTION

The LCD MONITOR will contain a Main Board, an Power Board, Key Board which house

the flat panel control logic, brightness control logic and DDC.

The Power Board will provide AC to DC Inverter voltage to drive the backlight of panel and

the Main Board chips each voltage.

Power Board

(Include: adapter, inverter)

Flat Panel and
CCFL backlight

Main Board

Key Board

RS232 Connector
For white balance
adjustment in factory
mode

HOST Computer

CCFL Drive.

AC-IN

100V-240V

Video signal, DDC

Monitor Block Diagram

Summary of Contents for VA712b-2

Page 1: ...1 ViewSonic Corporation Manufacture Date Mar 30 06 Service Manual ViewSonic VA712b 2 Model No VS10901 17 Color TFT LCD Display...

Page 2: ...ity 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 of ViewSonic t...

Page 3: ...7 3 Front Panel Control And Indicators 11 4 Circuit Description 17 5 Adjusting Procedure 27 6 Troubleshooting Flow Chart 47 7 Recommended Spare Parts List 48 8 Exploded Diagram And Spare Parts List 66...

Page 4: ...able 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 cloth not directly o...

Page 5: ...ly 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 Mura Take out th...

Page 6: ...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 upwards The panel is p...

Page 7: ...cal 130 Contrast Ratio 500 1 Typ Brightness 300 cd Typ Response Time 8ms Typ Active Display Area 337 9mm H x 270 3mm V Maximum Pixel Clock 135 MHz Horizontal Frequency 30 82 kHz Vertical Refresh Rate...

Page 8: ...Hz 35 1kHz Yes Yes 9 800 x 600 60Hz 37 9kHz Yes Yes 10 800 x 600 72Hz 48 1kHz Yes Yes 11 800 x 600 75Hz 46 9kHz Yes Yes 12 800 x 600 85Hz 53 7kHz Yes Yes 13 832 x 624 75Hz 49 7kHz Yes Yes 14 1024 x 76...

Page 9: ...5 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 5V 10 H V sync gr...

Page 10: ...e 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 Power 15 GND Lo...

Page 11: ...11 ViewSonic Corporation 3 Front Panel Function Controls And Indicators...

Page 12: ...ls 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 save the adjustment...

Page 13: ...everal color adjustment modes including 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 65...

Page 14: ...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 adjusts the wid...

Page 15: ...n 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 example with a 30...

Page 16: ...hite Balance Not shown on user s guide 1 Power Lock 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 setti...

Page 17: ...rightness control logic and DDC The Power Board will provide AC to DC Inverter voltage to drive the backlight of panel and the Main Board chips each voltage Power Board Include adapter inverter Flat P...

Page 18: ...18 ViewSonic Corporation 4 2 POWER BLOCK FUNCTION DESCRIPTION Inverter Block Function...

Page 19: ...19 ViewSonic Corporation Power Block Function...

Page 20: ...V for Reset Out 109 33VPNLOUT Panel on off switch out Max current driving 1A 58 BJT_B Embedded regulator P type BJT control pin out 5 TMDS_TST TMDS_TEST Pin Power on latch for host interface type 7 13...

Page 21: ...CPU core embedded device especially tailored for flat panel display applications It includes an 8051 CPU core 768 byte SRAM 4 channels of 6 bit ADC 3 external counters timers 6 channels of PWM DAC VE...

Page 22: ...l purpose I O open drain DA4 P5 4 6 44 PWM DAC output General purpose I O open drain DA5 P5 5 7 1 PWM DAC output General purpose I O open drain P5 6 HSCL2 8 2 General purpose I O Slave llC1 SCL2 open...

Page 23: ...eneral purpose I O COMS P6 5 29 23 General purpose I O COMS P6 6 CLKO1 30 24 General purpose I OCLKO1 COMS P6 7 31 25 General purpose I O COMS VSYNC 32 26 VSYNC input P1 7 36 30 General purpose I O St...

Page 24: ...he inside circuit diagram are as follows Pin Name Function 1 GND Ground 2 COMP Voltage feedback pin same as the COMP pin in UC384X By connecting a photo coupler to close the control loop and achieve t...

Page 25: ...Fluorescent Lamp and the transformer s characteristics NO Name Function Description NO Name Function Description 1 GNDT Ground 8 FB Feedback Input 2 Vds Dimming Voltage Input 9 COMP Error Amplifier Ou...

Page 26: ...26 ViewSonic Corporation...

Page 27: ...t 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 xyY value and use ID key to modify the TEXT description Fol...

Page 28: ...e 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 reached the v...

Page 29: ...ill show x 0 346 0 02 y 0 359 0 02 Y 210 cd m2 4 Adjust the RED of color3 on factory window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color3 on factory window until Chr...

Page 30: ...D H Position 50 Brightness 100 OSD V Position 50 Volume 50 OSD Time Out 15 Sec Color Temperature 6500K Resolution Notice Enable Sharpness 33 OSD background Enable 720X400 640X400 720X400 5 5 Function...

Page 31: ...x 624 75Hz 49 7kHz 1024 x 768 60Hz 48 4kHz 1024 x 768 70Hz 56 5kHz 1024 x 768 72Hz 58 1kHz 1024 x 768 75Hz 60 0kHz 1280 x 1024 60Hz 63 4kHz 1280 x 1024 75Hz 79 97kHz 1280x 720 60Hz 45kHz Function Tes...

Page 32: ...ViewSonic Corporation Fine Line Morie Pattern Figure1 Gray Scale Pattern Figure2 Horizontal Vertical Thickness Pattern R Color Pattern Figure 4 Figure 3 G Color Pattern Figure 5 B Color Pattern Figur...

Page 33: ...rase all end user s settings and restore the factory defaults Auto Image Adjust Please select and enter Auto Image Adjust function on Main Menu to see if it is workable The Auto Image Adjust function...

Page 34: ...eo boundary to be full scanned and within screen frame White Balance Test Signal 640 480 60Hz Test Pattern White and Black Pattern 1 5 8 R G B Colors Contrast Test Signal 1280 1024 60Hz Test Pattern R...

Page 35: ...Hz 1024 768 60 70 72 75 85Hz 1152 870 75Hz 1280 720 60Hz 1280 1024 60Hz Normally when the primary mode 1280 1024 60Hz is well adjusted and compliant with the specification the secondary display modes...

Page 36: ...VGA Cable P N 42 59901 003 1 Pin 4 11 should be connected to GND PC Personal Computer LPT Cable P N 42 59906 001 1 Firmware Upgrade Program One additional monitor for checking the program execution 2...

Page 37: ...37 ViewSonic Corporation 3 Firmware Upgrade Procedure Step 1 Let VA712 2 VA712b 2 set to be connected with AC cable and VGA cable Step 2 Execute the MSstar ISP tool...

Page 38: ...poration Step 3 Click Create Security File button Open a new window to key in security code Step 4 Set Command NO to 4 and key in security code 94 94 ac ca 53 to shown as following then press OK butto...

Page 39: ...ep 5 Click dropdown listbox for MTV type select the MTV512M64 viewed on your set Step 6 Click Load MCU File button Select the object bincode on your corresponding directory Step 7 Click button to fini...

Page 40: ...lect Auto optionbutton then execute the flashing action by clicking the RUN button Step 9 If the flashing F W has been completed the message of Check MCU CRC OK on the right TextBox means the Host ver...

Page 41: ...P2 and monitor of Fixture with VGA ports of VA712 2 VA712b 2 by VGA Cable 3 2 2 Connect P3 of Fixture with DVI port of VA712b 2 by DVI DVI Cable 3 2 3 Connect P1 of Fixture with Printer port of PC by...

Page 42: ...42 ViewSonic Corporation 3 3 DDC Key In Procedure Sep1 Select and execute DDC Key In program...

Page 43: ...43 ViewSonic Corporation Sep2 Inpute the S N and execute Enter...

Page 44: ...44 ViewSonic Corporation...

Page 45: ...45 ViewSonic Corporation Sep3 Key the Enter and write the data...

Page 46: ...46 ViewSonic Corporation Sep4 If ddc program OK and show data compare ok...

Page 47: ...47 ViewSonic Corporation 6 Trouble Shooting Flow Chart...

Page 48: ...3 19G6014 1 0 2 14 23G3178709 4A VSC17 LCD FRONT LOGO 1 15 23G3178709 6A BIRD LOGO E015 006 1 16 33G4942 X2 B FONCTION BUTTON 1 17 33G4943 1 POWER LENS 1 18 33G4944 1 VSC LOGO 1 19 34G1750A4Z B BEZEL...

Page 49: ...3 52G 1185 24 TAPE 65 54 52G 1206 A 3 55 52G 1207 A 1 56 52G 1217 VS 2 57 52G 1901 A 2 58 52G6019 1 YELLOW TAPE 5 59 52G6020 1 PROTECT FILM 1 60 52G8025 11803 MYLAR POWER 1 61 52G8025 11804 MYLAR SHIE...

Page 50: ...CLAA170EA07Q 17 LCD PAN 0 94 C 44G3783709 1A CARTON 1 95 AUPC780B3P AUDIO BOARD 96 AUPC780A7AIP AUDIO AI BOARD 1 97 AUPC780A7SMTP AUDIO SMT BOARD 1 98 12G 408 6 THERMAL PAD 1 99 33G801714A WAFER PLUG...

Page 51: ...IP 0 1UF 50V X7R C213 1 132 65G0805474 226213 CHEP 0 47UF 25V X7R 080 C204 1 133 65G0805474 226213 CHEP 0 47UF 25V X7R 080 C206 1 134 CBPC780KCWV3P CONVERSION BOARD 135 AIC780KCWV3P MAIN BOARD 1 136 3...

Page 52: ...17 6 PMBS3906 PNP Q405 1 172 57G 417 17 T PZT2907A SOT 223 Q403 1 173 57G 763 1 AO3401L U703 1 174 61L0603000 CHIPR 0OHM 5 1 10W FB409 1 175 61L0603000 CHIPR 0OHM 5 1 10W FB410 1 176 61L0603000 CHIPR...

Page 53: ...439 1 210 61L0603101 CHIPR 100OHM 5 1 10W R442 1 211 61L0603101 CHIPR 100OHM 5 1 10W R445 1 212 61L0603101 CHIPR 100OHM 5 1 10W R446 1 213 61L0603101 CHIPR 100OHM 5 1 10W R448 1 214 61L0603101 CHIPR 1...

Page 54: ...249 61L0603223 CHIPR 22K OHM 5 1 10W R4016 1 250 61L0603303 CHIP 30K OHM 5 1 10W R409 1 251 61L0603332 CHIP 3 3K OHM 1 10W R444 1 252 61L0603471 CHIPR 470OHM 5 1 10W R473 1 253 61L0603471 CHIPR 470OH...

Page 55: ...61L0603682 CHIP 6 8K OHM 1 10W R4007 1 289 61L0603750 CHIPR 75OHM 5 1 10W R436 1 290 61L0603750 CHIPR 75OHM 5 1 10W R443 1 291 61L0603750 CHIPR 75OHM 5 1 10W R447 1 292 65G0603100 31 CHIP 10PF 50V NP...

Page 56: ...R C454 1 327 65G0603104 32 CHIP 0 1UF 50V X7R C455 1 328 65G0603104 32 CHIP 0 1UF 50V X7R C456 1 329 65G0603104 32 CHIP 0 1UF 50V X7R C457 1 330 65G0603104 32 CHIP 0 1UF 50V X7R C458 1 331 65G0603104...

Page 57: ...HIP BEAD 0805 600OHM FB405 0 365 71G 56Z601 M CHIP BEAD 0805 600OHM FB701 0 366 71G 56Z601 M CHIP BEAD 0805 600OHM FB702 0 367 71G 56Z601 M CHIP BEAD 0805 600OHM FB703 0 368 71G 59C300 0 8X1 6 100M 30...

Page 58: ...ER 2 6 R A CN006 1 403 77G 600 1GCJ SW001 1 404 77G 600 1GCJ SW002 1 405 77G 600 1GCJ SW003 1 406 77G 600 1GCJ SW004 1 407 77G 600 1GCJ SW005 1 408 77G 600 1GCJ SW006 1 409 81G 12 1 GP LED GP32032ME R...

Page 59: ...SL 3KV MURATA C214 0 446 65G 3J1206EM 12PF 5 SL 3KV MURATA C215 0 447 65G 3J1206ET 12PF 5 SL 3KV TDK C205 1 448 65G 3J1206ET 12PF 5 SL 3KV TDK C210 1 449 65G 3J1206ET 12PF 5 SL 3KV TDK C214 1 450 65G...

Page 60: ...174 50LSH LINE FILTER L901 0 483 80GL17T 30 YS X FMR YSTDA500280G PT201 1 484 80GL17T 30 YS X FMR YSTDA500280G PT202 1 485 80GL17T 31 L X FMR PT 004433 3 T901 1 486 80GL17T 31 N X FMR T901 0 487 87G 5...

Page 61: ...05103 CHIPR 10KOHM 5 1 8W R915 1 523 61L0805104 CHIPR 100K OHM 5 1 8W R911 1 524 61L0805104 CHIPR 100K OHM 5 1 8W R919 1 525 61L0805152 CHIPR 1 5KOHM 5 1 8W R213 1 526 61L0805152 CHIPR 1 5KOHM 5 1 8W...

Page 62: ...5VX7R 0805 C203 1 562 65G0805104 22 CHIP 0 1UF 25VX7R 0805 C204 1 563 65G0805104 22 CHIP 0 1UF 25VX7R 0805 C206 1 564 65G0805104 22 CHIP 0 1UF 25VX7R 0805 C208 1 565 65G0805104 22 CHIP 0 1UF 25VX7R 08...

Page 63: ...2S 1N4148W DIODE D922 1 601 93G 6432S 1N4148W DIODE D923 1 602 93G 6432V DIODE LL4148 GS08 D202 0 603 93G 6432V DIODE LL4148 GS08 D203 0 604 93G 6432V DIODE LL4148 GS08 D205 0 605 93G 6432V DIODE LL41...

Page 64: ...1500PF 10 1KV Y5P C904 1 639 65G 1K152 1T GP 1 5NP 1KV 25F 10 C904 0 640 65G517K102 5T 1000PF 10 Y5P 500V C920 1 641 65G517K102 5T 1000PF 10 Y5P 500V C921 1 642 67G 2152207NT 22UF 50V C906 1 643 67G 2...

Page 65: ...1 670 95G 90 23 TINCOATEDCOPPER J903 1 671 95G 90 23 TINCOATEDCOPPER J904 1 672 715G1686 F PCB 1 673 705G 780 57V1P R909 674 61G152M10458G 100K OHM 5 2W R909 1 675 96G 29 6 SHRINK TUBE UL CSA 1 676 7...

Page 66: ...66 ViewSonic Corporation 8 Exploded Diagram And Spare Parts List...

Page 67: ...67 ViewSonic Corporation...

Page 68: ...68 ViewSonic Corporation 5 7 Packing For Shipping...

Page 69: ...50G 600 3 1 3 PE BAG 45G 76 28 V3 1 4 CD MANUAL 70G1701709 9B 1 5 QSG 41G7801709 6A 1 6 EPE COVER 45G 88606 1 7 MONITOR T780KCWHKDV3ABP 1 8 EPE COVER 45G 88609 B 1 9 PE BAG 45G 88607 1 44G3783 1 1 10...

Page 70: ...ing picture 11 6 Disassemble the 4 fixed screws in the shield remove the shield as the direction arrowhead showed refer to the following picture 12 7 Disassemble the 4 screws and 4 pins of the PWPC bo...

Page 71: ...71 ViewSonic Corporation 9 1 3 Show pictures Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6...

Page 72: ...72 ViewSonic Corporation Picture 7 Picture 8 Picture 9 Picture 10 Picture 11 Picture 12...

Page 73: ...73 ViewSonic Corporation Picture 13 Picture 14 Picture 15...

Page 74: ...74 ViewSonic Corporation Picture 16 Picture 17 Picture 18 Picture 19 Picture 20...

Page 75: ...75 ViewSonic Corporation 10 Block Diagram...

Page 76: ...51K 1 16W D701 SMAL140 PANEL_POWER BL_ADJ 2 4 6 8 10 12 14 1 3 5 7 9 11 13 CN702 C703 100uF 25V FB701 600 OHM C714 1uF 16V C706 100uF 25V delete R715 R720 C712 VCC 5V BL_ON_OFF VIN 3 GN D 1 VOUT 2 U7...

Page 77: ...R494 C445 NC OUT_L OUT_L OUT_R OUT_R IICSDA IICSCL R4003 100 1 16W R4002 100 1 16W NC 1 NC 2 NC 3 VSS 4 SDA 5 SCL 6 WC 7 VCC 8 U404 M24C16 MCU_VCC MCU_VCC R4008 4 7K 1 16W EEPROM_WP C448 0 1uF R478 4...

Page 78: ...G3N BGRN4 70 RTD2523B RSDS LVDS U401 Q402 PMBS3906 C406 22uF 16V RXO3 RXO3 RXOC RXOC RXO1 RXO2 RXO2 RXO1 RXEC RXE3 RXE3 RXO0 1 8DVCC R1 8AVCC RXE2 RXE1 RXE0 RXE1 RXE0 RXEC RXE2 DGND DGND MCU_RST C414...

Page 79: ...DC_SDA DDC_SCL R437 100 1 16W C424 0 047uF D421 UDZS5 6B DDC2_SCL DGND DDC_SDA DGND DDC_SCL DGND DDC2_SDA DGND D416 UDZS5 6B DDC2_SDA DDC2_SCL B1 VGA_B D418 UDZS5 6B HSIN D420 UDZS5 6B D422 UDZS5 6B R...

Page 80: ...V AOC Top Victory Electronics Co Ltd Custom 1 1 Monday August 29 2005 Title Size Document Number Rev Date Sheet of Q207 KTC5103L Y U P 1 2 3 C206 0 1uF 25V D201 RB050L 40 R217 1K 1 10W TP4 HVL 1 D209...

Page 81: ...4 3 R905 430K 1 8W C900 0 47uF 250V D921 31DQ06 ZD921 RLZ13B 1 2 C931 0 1uF 50V CN901 SOCKET 1 2 3 C927 0 1uF 50V R906 510K 1 8W IC921 KIA431A AT P 2 3 1 C906 22uF 50V DB901 KBP206G 1 4 3 2 C923 1000...

Page 82: ...6W C204 0 47uF 25V R211 20K 1 16W C211 100pF 1 4 5 2 3 CN201 PHONEJACK C213 0 1uF GND 1 GND 2 GND 3 INL 4 VAROUT_L 5 VOLUME 6 VAROUT_R 7 NC 8 INR 9 SVR 10 STBY 11 MUTE 12 GND 13 OUTR 14 VS 15 VS 16 OU...

Page 83: ...NN LED ORANGE LED GREEN SW003 SW SW004 SW SW005 SW SW006 SW GND SPKR_R SPKR_L KEY 2 GND Title Size Document Number Rev Date Sheet of CONTROL KEY PAD Switch B KEY PAD For Viewsonic VA713 AOC Top Victor...

Page 84: ...84 ViewSonic Corporation 12 PCB Layout Diagram 12 1 MAIN BOARD PCB TOP VIEW...

Page 85: ...85 ViewSonic Corporation...

Page 86: ...86 ViewSonic Corporation 12 2 MAIN BOARD PCB BUTTON VIEW...

Page 87: ...87 ViewSonic Corporation 12 3 KEYBOARD TOP VIEW 12 4 KEYBOARD BUTTON VIEW...

Page 88: ...88 ViewSonic Corporation 12 5 POWER PCB TOP VIEW...

Page 89: ...89 ViewSonic Corporation 12 6 POWER PCB BUTTON VIEW...

Page 90: ...90 ViewSonic Corporation 12 6 AUDIO PCB TOP VIEW BUTTON VIEW...

Page 91: ...Description 5 Adjust 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 Diagram B Are you...

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