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ViewSonic VA2226w-1 Service Manual Download Page 58

 55

 

ViewSonic Corporation 

Confidential - Do Not Copy 

   

VA2226w-1 

6.3. DC output voltage is unstable 

 

 

Unstable power 

Check sampling 

    Circuit 

Check R822, R823, 

R824 

Change R822, R823, 

R824 

Check the R pin 

voltage of IC803 

about 2.5V 

Check R819, R820 

Check R818, D804, C807 if 

short 

Change R818, 

D804, C807 

Check pin2 of 

IC802 voltage   

is 3V 

Check pin1 of 

IC802 voltage    

below 1V 

Change R808, R 809, 

R810, R 811, R815, 

END 

Check the C pin 

voltage of IC803 if 

3V 

Change 

IC803 

Summary of Contents for VA2226w-1

Page 1: ...ViewSonic VA2226w 1 Model No VS11803 22 Color TFT LCD Display VA2226w 1_SM Rev 1a Aug 2007 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 Service Manual...

Page 2: ...disclaims any warranty of merchantability or 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 he...

Page 3: ...otices 1 2 Specification 4 3 Front Panel Function Control Description 27 4 Circuit Description 32 5 Adjusting Procedure 42 6 Trouble Shooting Flow Chart 53 7 Block Diagrams 61 8 Schematic Diagrams 62...

Page 4: ...only in a lean cool dry environment If it gets wet unplug the power cable immediately and consult your closed dealer Always unplug the monitor before cleaning it Clean the cabinet with a clean dry cl...

Page 5: ...2 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 4 Handling and Placing Methods...

Page 6: ...3 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...

Page 7: ...Plug Detect DDC Yes Detached cable refer the Appendix A DVI D Cable 1 8m black with PC 2001 For Region code P A J K S units only Audio Cable 1 8m black with PC 2001 Yes MIC Cable 1 8m black with PC 20...

Page 8: ...nnector Pin out Refer to Appendix A Compliant DDC CI Video Signals Video RGB Analog Separate Sync Composite Sync SOG TMDS Digital Video Impedance 75 Ohms Analog 100 Ohms Digital Maximum PC Video Signa...

Page 9: ...requency and operating temperature Power Supply Transient Immunity Shall be able to withstand an ANSI IEEE C62 41 1980 6000V 200 ampere ring wave transient test with no damage Power Supply Line Surge...

Page 10: ...35 KHz For MAC 7 640 x 480 72 Hz 37 9 KHz VESA 8 640 x 480 75 Hz 37 5 KHz VESA 9 720 x 400 70 Hz 31 5 KHz 10 720 x 480 60 Hz 31 5 KHz DTV 11 720 x 576 50 Hz 31 3 KHz DTV 12 800 x 600 56 Hz 35 1 KHz V...

Page 11: ...the list it should display as normal or show on OUT OF RANGE OSD message without blanking 3 The image quality of 50Hz mode might be worse than 60Hz Primary Presets 1680x1050 60Hz User Presets Number...

Page 12: ...r pushing Button 1 2 6 2 Short Cuts Function from the button s 1 Main Menu refer to segment 2 6 3 2 Input toggle Analog or Digital refer to Appendix D To immediately activate Brightness menu It should...

Page 13: ...h to DDC CI When switch to DDC 2B 1 Long Press up key 3 seconds to switch DCR On Off 2 Loop DCR On DCR Off When switch to DCR ON When switch to DCR OFF 3 DCR Off in Factory mode 4 Reset to default whe...

Page 14: ...ult 70 3 Key button definition 1 Back to Main Menu or OSD off depend on previous status 2 Change to Brightness OSD Up Increase the OSD value setting Dn Decrease the OSD value Up Dn Recall to default C...

Page 15: ...n definition 1 Back to previous OSD status 2 Change to the selected input port Up Move the slider to Analog Dn Move the slider to Digital Digital Step 1 Turn off OSD Step 2 1 Target video input port D...

Page 16: ...decrease the OSD value setting Green 1 Adjust range 0 to 100 2 Default 100 3 Key button definition 1 Back to Color Adjust OSD 2 Jump to Blue OSD Up Increase the OSD value setting Dn decrease the OSD...

Page 17: ...0 to 100 2 Key button definition 1 Back to Manual Image Adjust OSD Up Increase the OSD value setting Dn Decrease the OSD value Manual Image Adjust 1 Key button definition 1 Back to previous OSD statu...

Page 18: ...and keep in Language Select OSD Finnish Set OSD language to Finnish and keep in Language Select OSD Setup Menu 1 Key button definition 1 Back to Main Menu OSD 2 Execute the selected function Up Rollin...

Page 19: ...and keep in Language Select OSD Resolution Notice Swap on and off the Resolution Notice function OSD H Position 1 Adjust range 0 to 100 2 Default 50 3 Key button definition 1 Back to Setup Menu OSD 2...

Page 20: ...tting Dn Decrease the OSD value setting Up Dn Recall to default value 60 Set OSD Time Out to 60 Seconds OSD Background Swap on and off the OSD Background Memory Recall 1 Background blanking 2 Recall w...

Page 21: ...ill indicate OSD Locked or OSD Unlocked for 3 seconds as below OSD Locked OSD Unlocked 6 When OSD appears on screen the OSD Lock Unlock short cut key will be disabled 2 6 5 Power Lock short cuts funct...

Page 22: ...ndicate Power Button Locked or Button Unlocked for 3 seconds as below Power Button Locked Power Button Unlocked 6 When OSD appears on screen the OSD Lock Unlock short cut key will be disabled 2 6 5 In...

Page 23: ...t of range While non defined timing is detected following OSD message will shows on 1 If the timing is over spec Fh Fv or dot clock the image shall be blanking and OSD background shall be non transpar...

Page 24: ...Pixel Pitch 0 282 mm Glass Treatment Anti Glare Hard coating 3H of Backlights 4 CCFL Backlight Life 40000 Hrs Min 300 cd m2 Typ after 30 minute warm up Luminance Center CT 6500K Contrast Brightness M...

Page 25: ...warm up Luminance Center CT 6500K Contrast Brightness Max 250cd m2 Min after 30 minute warm up Brightness Uniformity 13 points 80 Typ 75 Min Contrast Ratio 1000 1 Typ 800 1 Min Color Depth 16 7 milli...

Page 26: ...warm up Luminance Center CT 6500K Contrast Brightness Max 250cd m2 Min after 30 minute warm up Brightness Uniformity 13 points 80 Typ 75 Min Contrast Ratio 1000 1 Typ 700 1 Min Color Depth 16 7 milli...

Page 27: ...1 40 71 4F 01 01 50 01 01 01 01 21 39 90 30 62 1A 60 27 40 68 B0 36 00 EF 23 11 00 70 00 1C 00 00 00 FF 00 51 51 4B 80 30 37 30 31 30 30 30 30 31 0A 90 00 00 00 FD 00 32 4B 1E 52 11 100 00 0A 20 20 20...

Page 28: ...ESA 800 X 600 60Hz VESA 36 ESTABLISHED TIMING II 800 X 600 72Hz VESA 800 X 600 75Hz VESA 832 X 624 75Hz Apple Mac II 1024 X 768 60Hz VESA 1024 X 768 70Hz VESA 1024 X 768 75Hz VESA 1280 X 1024 75Hz VES...

Page 29: ...___________________________________________________________________ 72 89 Detailed Timing Descriptor Block 2 Monitor Serial Number QQK070100001 ________________________________________________________...

Page 30: ...olls through menu options and adjusts the displayed control Also a shortcut to display the Contrast adjustment control screen Displays the control screen for the highlighted control Also toggles betwe...

Page 31: ...the control press the up S or down T buttons 5 To save the adjustments and exit the menu press button 1 twice The following tips may help you optimize your display Adjust the computer s graphics card...

Page 32: ...ess adjusts background black level of the screen image Input Select toggles between inputs if you have more than one computer connected to the VA2226w Color Adjust provides several color adjustment mo...

Page 33: ...put coming from the graphics card in the computer the LCD model number the serial number and the ViewSonic website URL See your graphics card s user guide for instructions on changing the resolution a...

Page 34: ...reens OSD Timeout sets the length of time the OSD screen is displayed For example with a 15 second setting if a control is not pushed within 15 seconds the display screen disappears OSD Background all...

Page 35: ...R823 R824 R822 IC803 and IC803 witch control the duty of the PWM signal then all the convert circuit go to a stable operating station R805 R806 R835 ZD801 ZD806 and Q806 formed a under input voltage p...

Page 36: ...apacitor C506 connected to pin6 of IC501 C502 is used for soft start and compensation C502 C528 are used for dump noise The output drives include NDR4 NDRV2 PDRV3 PDRV1 pins1 3 15 16 respectively outp...

Page 37: ...ctor to prevent IC from ESD R101 102 103 and R105 106 107 are matching resistance Signal DDC_CLK series clock from CN102 15 passes through ZD104 for over voltage protection and then goes into EDID EEP...

Page 38: ...108 000 1280 x 960 60 0 60 0 108 000 64 0 60 0 108 000 1280 x 1024 80 0 75 0 135 000 65 3 60 0 121 750 1400 x 1050 82 5 75 0 136 000 59 9 60 0 106 500 1440 x 900 75 0 75 0 136 750 VESA Standard 720 x...

Page 39: ...RxO1 LVDS Differential data input Channel 1 18 RxE2 LVDS Differential data input Channel 2 4 RxO1 LVDS Differential data input Channel 1 19 RxE2 LVDS Differential data input Channel 2 5 RxO2 LVDS Diff...

Page 40: ...Response Time 5 ms Typical 8ms Max Surface Treatment Hard coating 3H Non Glare Lamp 4 CCFL Outline Dimension 493 7 W X 320 1 H x16 5 D Brightness uniformity 80 typ 75 min b MT220W W01 V 0 INL Supplier...

Page 41: ...1 H x16 5 Brightness uniformity 75 min 6 2 Optical characteristic of LCD panel 6 2 1 AUO M220EW01 V0 Item Unit Conditions Min Typ Max Remark Viewing Angle degree Horizontal CR 10 160 170 degree Vertic...

Page 42: ...7 0mA center point cd m2 250 300 The test methods for the above items definition please refer to the specification of InnoLux Panel MT220W W01 V 0 6 2 3 CPT Panel CLAA220WA01 Item Unit Conditions Min...

Page 43: ...roller IC Pin Symbol I O Description 1 NDRV2 O Bottom MOSFET gate drive output in dual forward converter 2 PGND High current power ground 3 NDRV1 O Bottom MOSFET gate drive output in dual forward conv...

Page 44: ...points is adjusted accordingly to the ouput 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 the internal comparat...

Page 45: ...urn on the monitor Activate the OSD control menu Select the specific function Turn off the monitor by pressing the button for 3 seconds DOWN Activate the Volume control menu and decrease the value opt...

Page 46: ...vel 3 Default EXIT AUTO ADJUSTMENT CONTRAST 70 BRIGHTNESS 100 EXIT ENGLISH KOREAN GERMAN FRENCH ITALIAN SPANISH JAPANESE SIMPLIFIED CHINESE TRADITIONAL CHINESE OSD MENU LANGUAGE RUSSIAN ENGLISH EXIT S...

Page 47: ...IT Escape from Factory menu PANEL Display panel information AUTO COLOR Automatically calibrate chip ADC parameter by using chip internal DAC GAIN ADC gain value OFFSET ADC offset value SPAN and STEP S...

Page 48: ...the Menu POWER to execute Auto Color item After the Auto Color process finished please press Power to restart monitor 6 EDID Rewrite EDID data to EEPROM If we need to rewrite the EEPROM data please co...

Page 49: ...x 0 283 0 03 y 0 298 0 03 Chroma Signal Generator and color analyzer Modes switching check 1 Use Chroma Pattern Generator to make sequence VESA 640x480 800x600 1024x768 1280x1024 and power saving sign...

Page 50: ...47 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Disassembly Procedure BASE HINGE COVER STAND...

Page 51: ...48 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Front Cover Back Cover...

Page 52: ...49 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Keypad Board Chassis...

Page 53: ...50 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Power Board Key Power Cable LVDS Cable...

Page 54: ...51 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 I F Board...

Page 55: ...the monitor Figure 1 1 2 Put the monitor in the PE bag and seal the bag with tape Figure 2 Figure 1 Figure 2 1 3 Put the cushions on the monitor 1 4 Place the monitor into the carton and then put all...

Page 56: ...der 16 grey scalar pattern This LCM is analog interface So if the entire screen is an abnormal color that means the problem happen in the analog circuit part if only some scale appears abnormal color...

Page 57: ...primary rectifier voltage Check IC802 C804 T801 Check circuit if Check F801 P801 RT 801 D801 Check pin6 of IC802 voltage about 12V CheckC810 D803 C80 7 Check pin2 of IC802 voltage about 3V Check prim...

Page 58: ...Circuit Check R822 R823 R824 Change R822 R823 R824 Check the R pin voltage of IC803 about 2 5V Check R819 R820 Check R818 D804 C807 if short Change R818 D804 C807 Check pin2 of IC802 voltage is 3V Che...

Page 59: ...heck sampling Circuit Check R822 R823 R824 Change R822 R823 R824 Check the R pin voltage of IC803 Check R819 R820 Check R818 D804 C807 if short Change R818 D804 Check pin2 of IC802 Check pin1 of IC802...

Page 60: ...57 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 6 5 Backlight can t be turned on...

Page 61: ...58 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 6 6 Black Screen and backlight turn on...

Page 62: ...226w 1 6 7 White Screen END White screen Check LVDS signal Check Q101 Q103 Q110 C108 C109 Check Panel Enable of U105 pin48 Check VLCD is 5V Change LVDSCable LVDS Cable Reinsert Workmanship Panel Fail...

Page 63: ...60 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 6 8 Bad Screen...

Page 64: ...ViewSonic Corporation Confidential Do Not Copy VA2226w 1 7 Block Diagram 61...

Page 65: ...wSonic Corporation Keypad Power key 1 POWER 2 From IF BD SW901 TACT 4 3 1 3 2 4 ZD904 5V6 NC LED901 LED Y B 3 2 1 SW903 TACT 4 3 1 3 2 4 ZD905 5V6 NC SW902 TACT 4 3 1 3 2 4 ZD901 5V6 NC ZD906 5V6 NC C...

Page 66: ...UL4 06 1 2 4 3 C806 4700p 400V R807 750 1 ZD803 12V R827 10R C809 47p 1KV R819 1K R810 510K R830 10K R815 12K 1 C803 0 47 275V CN801 60mm 8P 1 2 3 4 5 6 7 8 1 3 2 Q803 NC PMBT3906 C811 0 1 50V IC801...

Page 67: ...7 BAV99 1 2 3 D508 BAV99 1 2 3 C514 2700p 50V C511 0 022 25V R502 680 NC C523 12p 3KV R531 3K3 1 R535 15 R527 200 C515 2 2u 16V C527 2700p 50V R514 47K 1 R532 33 R525 3M 3KV R505 33 IC501 OZ9938G 1 2...

Page 68: ...47u 16V D102 BAV99 1 3 2 C113 0 047u 16V C120 NC 33p 50V R218 10K ZD102 5V6 C124 NC 0 1 16V C125 0 1 16V D208 BAV99 1 3 2 R126 100 Q201 PMBT3904 1 3 2 C115 0 047u 16V R211 10 1 D202 BAV70 3 2 1 ZD202...

Page 69: ...S232_TX DDCA_SCL RS232_RX DDCD_SDA DDCD_SCL NC AVDD_33 VDDP GPIO_P22 PWM1 GPIO_P04 GPIO_P00 SAR0 GPIO_P01 SAR1 GPIO_P02 SAR2 GPIO_P06 GPIO_P07 NC NC NC I2C_MDA I2C_MCL RST GPIO_P15 GPIO_P16 VDDC VDDC...

Page 70: ...67 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 9 PCB Layout Diagrams...

Page 71: ...68 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...

Page 72: ...69 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...

Page 73: ...70 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...

Page 74: ...71 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 10 Exploded Diagram and Exploded Parts List...

Page 75: ...1 10 CB 00008192 430303000840R LVDS CABLE 1 11 N A 701000004800R ASSY CHASSIS W DVI LE2275 1 12 N A 511150101800R FOIL AL DOUBLE COND 60X35XT0 07mm LE2016 1 13 N A 714050010300R ASSY BACK Asm W DVI LE...

Page 76: ...LE DVI D 18 1P MALE 6FT BLACK ROHS 1 4 A 00006733 453070800480R PWRCORD 7A 125V BLK 6FT CNS VCTF 3Gx0 75 1 5 P 00008603 506040003500R CUSHION LEFT LE2280 1 6 P 00008606 506020017700R CARTON LE2275 VA2...

Page 77: ...T Black RoHS CB 00008190 453030300370R 20 D Sub Cable 15P MALE 6FT RoHS CB 00008191 453010100310R 21 Flat Cable 30P 187mm ROHS CB 00008192 430303000840R 22 HRN 8P 185mm UL1571 28 RoHS CB 00008353 4303...

Page 78: ...2 VA2216 31 N A 503040000600R RUBBER COVER BLACK LE2082 400 32 N A 509116608510R SCREW P CROSS M4 8 BLACK NL NYLOK 400 33 C 00008570 501020216100R HINGE COVER LE2082 100 34 PL 00008187 714010005100R A...

Page 79: ...Y 8P 185mm UL1571 28 RoHS 100 71 N A 503060005800R GASKET EMI L80xW10xH6 5mm LE2280 100 72 N A 511150101800R FOIL AL DOUBLE COND 60x35xT0 07mm LE2 100 73 N A 503080001100R RUBBER SILICON THERMAL CONDU...

Page 80: ...cuit Description 5 Adjustment Procedure 6 Troubleshooting Flow Chart 7 Block Diagrams 8 Schematic Diagrams 9 PCB Layout Diagrams 10 Exploded Diagram and Exploded Parts List 11 Recommended Spare Parts...

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