ViewSonic VG1921wm-2 Service Manual Download Page 3

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ViewSonic Corporation

Confidential - Do Not Copy

VG1921wm-2

TABLE OF CONTENTS

Precautions and Safety Notices

Specification

Front Panel Function Control Description

Circuit Description

Adjustment Procedure

Troubleshooting Flow Chart

Recommended Spare Parts List

Exploded Diagram and Exploded Parts List

Block Diagram

10.

Schematic Diagrams

11.

PCB Layout Diagrams

Summary of Contents for VG1921wm-2

Page 1: ...ViewSonic VG1921wm 2 Model No VS11354 19 Color TFT LCD Display VG1921wm 2_SM Rev 1a Sep 2006 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 Service Manual...

Page 2: ...expressed or implied with 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...

Page 3: ...otices 1 2 Specification 4 3 Front Panel Function Control Description 9 4 Circuit Description 14 5 Adjustment Procedure 25 6 Troubleshooting Flow Chart 37 7 Recommended Spare Parts List 44 8 Exploded...

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: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 2 4 Handling and Placing Methods...

Page 6: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 3...

Page 7: ...W x H x D 460 x 434 x 230 mm Dimension Package W x H x D 560 x 525 x 282 mm Physical Net Weight 5 4 kg Weight Package Gross Weight 6 9 kg Temperature 32 104 0 40 Operating Condition Humidity 10 90 Tem...

Page 8: ...WHEN UNDER FULL LOAD WITH ALL COMBINATIONS OF INPUT VOLTAGE INPUT FREQUENCY AND OPERATING TEMPERATURE Power Supply Transient Immunity SHALL BE ABLE TO WITHSTAND AN ANSI IEEE C62 41 1980 2000V 200 AMPE...

Page 9: ...640 x 480 72 Hz 37 9 KHz DMT 8 640 x 480 75 Hz 37 5 KHz DMT 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 DMT 13 800 x 600 60 H...

Page 10: ...hen a new mode is detected See section 0 Touch Function Actions 6 FRONT PANEL CONTROLS AND INDICATORS Front Panel Hardware Controls Power Switch Front Head Power Control soft Power Switch Power LED Fr...

Page 11: ...button locked the LCD would automatically turn back On when power is restored after a power failure If the power button is not in the locked mode then power should return to it s previous state when p...

Page 12: ...ed in Main Menu Controls on page 10 Main Menu with OSD controls Front Control Panel shown below in detail Scrolls through menu options and adjusts the displayed control Also a shortcut to display the...

Page 13: ...press button 1 twice The following tips may help you optimize your display Adjust the computer s graphics card so that it outputs a 1440 x 900 60Hz video signal to the LCD display Look for instructio...

Page 14: ...reen G and blue B The factory setting for this product is 6500K 6500 Kelvin sRGB This is quickly becoming the industry standard for color management with support being included in many of the latest a...

Page 15: ...om 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 and refresh ra...

Page 16: ...screens Resolution Notice allows the user to enable or disable this notice If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1440 x 900 the following...

Page 17: ...to Vcc pin during normal operation Otherwise error amplifier and feedback current input the FB pin for duty cycle control 4 1 3 DC_5V and DC_14V Output Circuit For DC 5V D805 is used to rectify the in...

Page 18: ...the backlights are on When the I O port is high Q106 is conducted and the backlights are off U105 35 is defined as DET VGA connected with CN103 5 U105 84 is a pin of hardware reset U105 54 55 58 65 6...

Page 19: ...832 640 40 120 VESA 640 480 72Hz 72 809 520 480 3 20 31 500 37 500 840 640 64 120 VESA 640 480 75Hz 75 000 500 480 3 16 31 500 43 269 832 640 56 80 VESA 640 480 85Hz 85 008 509 480 3 25 36 000 35 156...

Page 20: ...the backlights are on When the I O port is high Q106 is conducted and the backlights are off U105 35 is defined as DET VGA connected with CN103 5 U105 84 is a pin of hardware reset U105 54 55 58 65 6...

Page 21: ...ol Description 1 VCC5V 5 1V INPUT 2 VCC5V 5 1V INPUT 3 GND GND 4 ON OFF CCFL on off control 5 BRIGHTNESS Panel luminance control CCFL brightness 6 GND Ground 7 VOL Volume control input 8 MUTE Mute con...

Page 22: ...1 minus signal of even channel 1 LVDS 16 RXE1 plus signal of even channel 1 LVDS 17 GND Ground 18 RXE2 minus signal of even channel 2 LVDS 19 RXE2 plus signal of even channel 2 LVDS 20 RXEC minus sign...

Page 23: ...el 0 LVDS 14 GND Ground 15 RXE1 minus signal of even channel 1 LVDS 16 RXE1 plus signal of even channel 1 LVDS 17 GND Ground 18 RXE2 minus signal of even channel 2 LVDS 19 RXE2 plus signal of even cha...

Page 24: ...function 5 ISEN I Current sense feedback 6 VSEN I Voltage sense feedback 7 OVPT I Over voltage over current protection threshold setting pin 8 NC 9 NC 10 ENC I ON OFF control of IC 11 LCT I Timing ca...

Page 25: ...SCL RS232_RX I O DDC Clock for Analog Interface UART Receiver GPIO 32 VDDP I Digital Output Power 33 GND Ground 34 VDDC I Digital Core Power 35 GPIO_P15 PWM0 I O General Purpose Input Output 4mA drivi...

Page 26: ...a Output 69 LVBCKP O B Link Positive LVDS Differential Clock Output 70 LVBCKM O B Link Negative LVDS Differential Clock Output 71 LVB2P O B Link Positive LVDS Differential Data Output 72 LVB2M O B Lin...

Page 27: ...mA driving strength General Purpose Input Output 4mA driving strength 94 GPIO_P13 I O General Purpose Input Output 4mA driving strength 95 GPIO_P14 I O General Purpose Input Output 4mA driving strengt...

Page 28: ...3 1 OSD table Layer 1 Layer 2 Layer 3 Auto Image Adjust Contrast 3 4 Contrast Brightness Brightness 3 4 Volume Volume Audio for VA703m only Mute On Off sRGB 9300K 6500K 5400K Red Green Color Adjust U...

Page 29: ...indicate OSD Locked OSD Lock should not lock Power Button and Power Lock function 3 3 Power lock Menu function Power Lock Menu Function Check Item Method Phenomenon Activate Power Lock 1 10S Can not t...

Page 30: ...the power key Turn the monitor off and then turn it on 5 Auto Color Automatically calibrate chip ADC parameter by using chip internal DAC If it is a new built set and it is first time to do the auto...

Page 31: ...Corporation Confidential Do Not Copy VG1921wm 2 28 7 2 Using mStar ISP Tool Update FW 1 Seletct Read Choose the corresponding firmware load to MCU 2 Select Connect auto connect for ISP 3 Select Run s...

Page 32: ...tent Equipment Test OSD function 1 Signal is set as 1280x1024 60Hz 2 LCM button are from left to right checking whether each single function key and compound function key can be worked Chroma Signal G...

Page 33: ...picture must be normal 3 LED is Orange at power saving mode Chroma Signal Generator Y measurement at default setting 1 Set brightness to default value 100 and contrast to default value 70 at 6500K 2...

Page 34: ...n 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 the accessories into the carton At last cl...

Page 35: ...Disassembly Procedure ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 32...

Page 36: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 33...

Page 37: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 34...

Page 38: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 35...

Page 39: ...er 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 t...

Page 40: ...ifier voltage Check IC802 C804 T801 Check circuit if short Check F801 P801 RT 801 D801 Check pin6 of IC802 voltage about 12V CheckC810 D803 C807 Check pin2 of IC802 voltage about 2V Check primary OVP...

Page 41: ...g 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 Check pin2 of IC802 voltage is 3V Check...

Page 42: ...cuit Check R810 R811 R818 Change R810 R811 R818 Check the R pin voltage of IC803 about 2 5V Check R809 R808 R814 D809 Check D806 C815 if short Change D806 C815 Check pin1 of IC802 voltage is 5 8V Chec...

Page 43: ...CN101 Check CCFL Enable pin 85 of U105 Check crystal pin 96 97 waveform of U105 Check reset pin84 of U105 Check power supply for U105 Check power supply pin 1 2 of CN101 Check R167 Q106 R108 R110 Inve...

Page 44: ...t turn on Black Screen Power Fail Check Power Supply Pin 1 2 of CN101 Check Power Pin 2 of U101 and Pin 2 of U102 Check Reset Waveform Pin 84 of U105 Check Crystal Waveform Pin 96 97 of U105 U101 U102...

Page 45: ...wm 2 42 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 L...

Page 46: ...Confidential Do Not Copy VG1921wm 2 43 8 Bad Screen Check the pins of U105 Bad Screen Check Crystal pin96 97 of U105 Change LVDS Cable LVDS Cable Reinsert CheckX101 C153 C154 LVDS Cable NG W orkm ans...

Page 47: ...00800710R 16 Flat Cable FFC 30P 160mm RoHS CB 00008013 430303000600R 17 Speaker W Case 1 5W 16 350mm E 00008012 618100101500R 18 LCD PANEL 19 MT190AW01 V0 AM19000040 E 00008016 631102090600R 19 Generi...

Page 48: ...Y BACK COVER LE1941 100 34 C 00008035 714030007200R ASSY BEZEL B S LE1941 100 35 C 00008036 714020007200R ASSY BASE B LE1941 100 36 N A 714087961100R ASSY PANEL V0 G1 2 3 W SPK LE1941 660 100 37 C 000...

Page 49: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 46 8 Exploded Diagram and Exploded Parts List...

Page 50: ...N A 501030204300R BUTTON POWER KEY LE1941 1 5 5 B 00008023 790691401600R PCBA P I BOARD LE1941 642 1 5 6 N A 502090304110R CHASSIS LE1941 1 5 7 B 00008022 790691301650R PCBA I F BOARD LE1941 660 1 6 N...

Page 51: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 48...

Page 52: ...SZ4120955 1 7 A 00008015 703000003100R KIT ACCESSORY INL V0 LE1941 1 8 N A 506120006200R BAG PLASTIC W 545 165 xL1100xT0 05mm LE1 1 9 C 00008036 714020007200R ASSY BASE B LE1941 1 11 A 00006679 453070...

Page 53: ...6LK Lamp2 Keyboard Lamp3 Keypad Connector VGA Input VGA Connector AC Line Filter AC Socket Panel Feedback OVP LTV817M Power Transformer Scaler Power Transformer2 Lamp1 Lamp4 AC Input 90V 264V Phone Ja...

Page 54: ...C102 100u 16V C105 22u 25V Q106 PMBT3904 1 3 2 Q110 2N7002 1 3 2 Q101 AP2305GN 1 3 2 R191 4K7 U102 FS8860 18PJ 3 1 2 VIN ADJ VOUT C104 0 1 50V U101 FS8860 33PJ 3 1 2 VIN ADJ VOUT 1 3 2 Q105 PMBT3906 C...

Page 55: ...C122 NC R128 4K7 R149 4K7 TVS110 BAV99 1 3 2 R144 10 C115 0 047 25V U103 CAT24WC02W 1 2 3 4 5 6 7 8 A0 A1 A2 GND SDA SCL WP VCC R148 4K7 C129 0 1 50V ZD106 5V6 Q104 PMBT3904 NC 1 3 2 R116 100 C112 0...

Page 56: ...DA GPIO_P10 I2C_MCL RST GPIO_P23 GPIO_P22 AVDD_MPLL AVDD_PLL VDDP VDDP VDDC VDDC VDDC GND GND GND GND GND BYPASS RSTN NC NC NC R178 100 C136 0 1 50V R168 100 R159 1K R167 4 7K X101 14 31818MHz C142 22...

Page 57: ...MUTE 2 From IF BD LED_B LED_O Power SW902 SW TACT 1 3 2 4 ZD902 5V6 NC LED901 LED Y B 3 2 1 SW906 SW TACT 1 3 2 4 SW905 SW TACT 1 3 2 4 R902 2K2 SW901 SW TACT 1 3 2 4 CN902 Harness from keypad to pow...

Page 58: ...4V 14V 14V C713 10uF 25V R703 10K CN701 4 3 2 1 P701 4 2 3 5 1 C711 4700pF C703 0 1 50V R705 27K Q701 PMBT3904 1 3 2 U701 TDA_7496L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Gnd Gnd Gnd INL V...

Page 59: ...3 D508 BAV99 1 2 3 D507 BAV99 1 2 3 C514 2700p 50V C523 10p 3KV C511 0 022 25V R502 680 R531 3K3 1 R535 0 R527 470 C527 2700p 50V C515 2 2u 25V R514 47K 1 R532 33 R525 3M 3KV R505 33 IC501 OZ9938G 1...

Page 60: ...30 10K ZD802 16V NC Q801 2PC1815GR 1 3 2 T801 SPW 055 1 2 3 5 4 11 6 7 9 10 8 L801 20mH 4 1 3 2 F801 2A 250V R809 510K C807 47u 25V C818 1000u 10V C804 100u 450V C813 1000p 500V C825 0 1 50V R819 1K C...

Page 61: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 58 11 PCB Layout Diagrams...

Page 62: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 59...

Page 63: ...rcuit Description 5 Adjustment Procedure 6 Troubleshooting Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Exploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout Dia...

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