Service Manual ViewSonic VX1945wm-3 Model No. VS11444 19” Color TFT LCD Display (VX1945wm-3_SM Rev. 1a Nov.
Copyright Copyright © 2006 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.
TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 4 3. Front Panel Function Control Description 14 4. Circuit Description 26 5. Adjustment Procedure 36 6. Troubleshooting Flow Chart 45 7. Recommended Spare Parts List 53 8. Exploded Diagram and Exploded Parts List 55 9. Block Diagram 59 10. Schematic Diagrams 60 11.
1. Precautions and Safety Notices 1. SAFETY PRECAUTIONS This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper used or installation may cause damage to the monitor as well as to the user. WARNINGS: This monitor should be operated only at the correct power sources indicated on the label on the rear of the monitor. If you’re unsure of the power supply in you residence, consult your local dealer or Power Company.
.2 Handling and Placing Methods ViewSonic Corporation Confidential - Do Not Copy 2 VX1945wm-3
ViewSonic Corporation Confidential - Do Not Copy 3 VX1945wm-3
2. Specification 2.1. INTRODUCTION FEATURES TFTLCD PANEL 1st Innolux MT190AW01 V.0 VX1945wm-3 Size 19 " wide 300 cd/㎡ Luminance (Typ) Contrast Ratio (Typ) 700:1 Colors 16.2 M (6 bits + 2 bits FRC) Response Time 5 ms(on/off) Viewing Angle (H/V) 160 ° / 160 ° Recommend resolution Video Input Signal Audio Output Signal Sync Compatibility Compatibility Power Voltage Power Consumption USB Card reader Audio Audio 1440x900@60Hz Analog (Head) Yes (75ohms, 0.7/1.0 Vp-p) Digital (Head) Yes 3.
Package (Gross Weight) Operating Condition Storage Condition 6.7 Kg Temperature (℉/℃) / 14.8 lbs 32℉-104℉ / 0℃-40℃ Humidity (%) 20 % Temperature (℉/℃) - 80 % -4℉-140℉ / -20℃-60℃ Humidity (%) 10% - 90 % Global: CB, MPR II, WEEE,ROHS , ISO13406-2 VSA:UL, cUL, FCC-B, TUV-S, NOM, Energy Star Regulation VSE:TUV/ERGO,CE ,GOST-R+Hygienic ,SASO , ENERGY VSI: BSMI, CCC, PSB, C-TICK, MIC VSCN:CCC ViewDock – Multimedia base Spec. Device prococal USB Standards USB 2.0/1.
MIC VR Audio I/O THD < 10% (Vol. Max) S/N 60dB (Built-in) Sensitivity: -38dB +- 3dB Volume control Rotation stopper strength: 1.0Kgf.cm Total rotational angle: 220+ 5˚ Input 2-in-1 Audio-in x 1 (Audio-in / MIC-in) Output Audio-out x1 , Headphone out x1 Compatible with iPOD video/iPOD photo/iPOD nano/iPOD Mini/iPOD iPOD connector U2/iPOD Input Voltage Range: 100~240V Input Frequency: 50/60Hz Power adapter External Output Voltage: 12V Full load: 2.0A Peak load: 2.
2.2. GENERAL specification Test Resolution & Frequency 1440x900 @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default: Contrast = 70%, Brightness = 100% 2.3.
Leakage Current 3.5mA (Max) at 254VAC / 60Hz Efficiency (at 115VAC Full Load) Typical: 80% Minimum: 75% Fuse Internal and not user replaceable Power Output 35 Watts (typ) Ripple and Noise Ripple: <3% Max Input AC Current 1.2 Arms @ 100VAC, 0.6 Arms @240VAC Inrush Current (Cold Start) 40 A (max) @ 120VAC 60 A (max) @ 220VAC Power Supply Cold Start Shall start and function properly when under full load, with all combinations of input voltage, input frequency, and operating temperature.
2.5. ELECTRICAL REQUIREMENT Horizontal / Vertical Frequency Horizontal Frequency 24-83 khz Vertical Refresh Rate 50 – 85* Hz Maximum Pixel Clock 140 MHz Sync Polarity Independent of sync polarity. Timing Table @ 70 Hz, SOG 640 x 350 Composite Separated Item 1 Timing 31.5 KHz Digital - TMDS Analog Remark For Analog sync, the image vertical size image will be not full screen (Still at the center) 2 640 x 400 @ 60 Hz, 31.
1280x768@50Hz by [1]+[2] short cut key 20 1024 x 768 @ 60 Hz, 48.4 KHz 21 1024 x 768 @ 70 Hz, 56.5 KHz 22 1024 x 768 @ 75 Hz, 60 KHz 23 1024 x 768 @ 75 Hz, 60.02 KHz 24 1024 x 768 @ 85 Hz, 68.7 KHz 25 1152 x 864 @ 75 Hz, 67.5 KHz 26 1152 x 870 @ 75 Hz, 68.7 KHz 27 1280 x 768 @ 50 Hz, 39.6 KHz For Analog sync, Switch 1024x768@50Hz and 1280x768@50Hz by [1]+[2] short cut key 28 1280 x 768 @ 60 Hz, 47.4 KHz 29 1280 x 768 @ 60 Hz, 47.
2.6 TFT LCD PANEL Panel Characteristics: 1st Source Panel Model number Type Active Size Pixel Arrangement Pixel Pitch GLASS TREATMENT # OF BACKLIGHTS BACKLIGHT LIFE Luminance (5-point) – Condition: CT = 6500K, Contrast = Max, Brightness = Max Brightness Uniformity Contrast Ratio Color Depth Viewing Angle (Horizontal) Viewing Angle (Vertical) Response Time 10%-90% @ Ta=25°C Panel Defects INNOLUX MT190AW01 V.0 TN type with LVDS interface 19” WIDE ; 410.4(H) X 256.5(V) RGB Vertical Stripe 0.285(H) x 0.
Function descriptions OSD Lock short cuts function for the buttons The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user then tries to access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen for 3 seconds showing "OSD Locked". The OSD lock will be deactivated by pressing the front panel control buttons "(1), & (▲)" again for 10 seconds.
further use 2. It should be reset by Memory Recall function(Should not reset by power off, power unplug and others) OSD Auto Save The OSD shall save new settings when it is turned off by the user or when it times out. There shall not be a separate save Factory Defaults Item Defaults Item Defaults Contrast 70% Brightness 100% Resolution Notice Enabled Color Temperature 6500K Volume N/A Sharpness 100% Balance N/A OSD H. Position 50% Treble N/A OSD V.
3. Front Panel Function Control Description Adjusting the Screen Image Main Menu with OSD controls Front Control Panel shown below in detail Standby Power On/Off Power light Blue = ON Orange = Power Saving Displays the control screen for the highlighted control. Also toggles between two controls on some screens. Also a shortcut to Auto Image Adjust. Scrolls through menu options and adjusts the displayed control. Also a shortcut to display the Contrast adjustment control screen.
Do the following to adjust the display setting: 1. To display the Main Menu, press button [1]. NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu. 2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu. 3. After the desired control is selected, press button [2]. A control screen like the one shown below appears.
Main Menu Controls Adjust the menu items shown below by using the up S and down T buttons. Control Explanation Auto Image Adjust sizes and centers the screen image automatically. Contrast adjusts the difference between the image background (black level) and the foreground (white level). Brightness adjusts background black level of the screen image. Input Select toggles between inputs if you have more than one computer connected to the VX1945wm.
Control Explanation sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the sRGB setting will cause the Contrast and Brightness adjustments to be disabled. 9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting).
Control Explanation Manual Image Adjust Sub-menu H. Size (Horizontal Size) adjusts the width of the screen image. H./V. Position (Horizontal/Vertical Position) moves the screen image left or right and up or down. Fine Tune sharpens the focus by aligning text and/or graphics with pixel boundaries. NOTE: Try Auto Image Adjust first. Sharpness adjusts the clarity and focus of the screen image.
Control Explanation 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 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 second” setting, if a control is not pushed within 30 seconds, the display screen disappears.
ViewDockTM Key Features Features The VX ViewDock comes with the following advanced features: • 4-port USB 2.0 hub (USB 1.1 compatible) • 8-in-1 card reader (SD, MMC, MS, MS Pro, CF I & II, MD, SMC) • 3-watt subwoofer support • iPod docking & charging • Headphone jack and built-in microphone System requirements For optimal use with the ViewDock, the computer should have the following minimum system requirements: Hardware requirements • Pentium 200 CPU or higher • CD-ROM for driver installation • USB2.0/1.
Physical Description Please refer to the following illustrations to identify the components of the ViewDock.
Card Reader Installation Refer to the following information After connecting the ViewDock to your PC, Windows File Manager will show 4 extra icons. Step1. Please check your card socket Step2. Insert your memory card. Each slot of the card reader will be recognized as a Removable Disk and the icon will be shown in "My Computer" of Windows You do not need to install any special drivers for the Card Reader if your OS is Windows 2000/ ME/XP.
USB Hub Installation Refer to the following information Downstream port Connect to device Type A female Connect any USB devices via the USB ports on the ViewDock. Windows will auto detect and install the generic Windows USB driver for USB 1.1/2.0 device operation. You do not need to install any special drivers for the USB Hub if your OS is Windows 2000/ ME/XP. USB hub installation guide for Windows 98SE : Insert the included CD into the CD-ROM drive.
ViewDockTM Connecting with iPod Refer to the following information 1. Make sure the ViewDock power is ON. 2. Dock your iPod into the universal iPod docking station with the appropriate adapter insert. 3. The iPod LED indicator will turn on amber 4. Wait for a few seconds for the iTunes software to launch. 5. Play your favorite song with iTunes software (for all iPod models) or play music from iPod directly (excluding iPod shuffle.
4. Circuit Description 4.1 Switching Mode Power Supply 4.1.1 AC Current Input Circuit P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input voltage is from 90v to 264V. R801 and R802 joined between two inputting main circuit to prevent man from shock. L801 is used to clear up low frequency wave. C801 and C802 are used to discharge the waves that L801 produced. High frequency waves are damped by C801 and C802.
1R503, ZD501, R502, Q501 components convert +14V voltage into +5.0V voltage, and the voltage supply to IC501. The extra PWM pulse signal (BRIGHTNESS signal)input to control IC through R512, R514, C510, The LCT pin is set to a DC voltage of 0.7V by using a resistor divider(R507, R516), change the duty of PWM pulse, will regulate the lamp current. The ON/OFF voltage connect to pin10 of IC501 through D501, R501, A voltage of 2V to pin10 of IC501 enables the IC and activates the striking timer.
Signal R, G, B input through CN103 #1, #2, #3, and C112, C113 and C114 filtering the high frequency noise. Signal HSYNC and VSYNC input through CN103 #13 and #14, and C125, R137, C126, R136 filtering. Then the analog signal enters U105, and then U104 deals with it internally. In addition, TVS101, TVS102, TVS103, TVS104 (the four are BAV99), ZD101, ZD105, ZD106, ZD107, ZD108(they are constant voltage diode of 5V6) are ESD protector.
MAC 832*624@75Hz 43.269 85.008 35.156 56.250 37.879 60.317 48.077 72.188 46.875 75.000 53.674 85.061 49.725 74.550 − − + + + + + + + + + + − − 832 509 1024 625 1056 628 1040 666 1056 625 1048 631 1152 667 640 480 800 600 800 600 800 600 800 600 800 600 832 632 56 3 72 2 128 4 120 6 80 3 64 3 64 3 80 25 128 22 88 23 64 23 160 21 152 27 224 39 VESA 48.363 − 1344 1024 136 160 1024*768@60Hz 60.004 − 806 768 6 29 VESA 1024*768@70Hz 56.476 70.069 60.023 75.029 68.677 84.997 57.700 72.125 67.
4.5 Power On/Off Sequence 4.5.1 Hardware Power ON When power cord is plugged into AC socket, SMPS starts work and provides U105 with VCC5V. When VCC5V inputs, U105 resets circuit active, sets U105 all registers to preset modes, and then monitor goes into stand-by mode. That means hardware power on has been completed. 4.5.2 Software Power ON/OFF When press power key, U105 # 90 recieves low pulse,and then U105 will do the power on/off.
4.7.2 4.7.3 CN101 (Power BD to Interface BD) Pin No. Symbol Description 1 VCC5V +5.1V INPUT 2 VCC5V +5.1V INPUT 3 GND 4 ON/OFF 5 BRIGHTNESS 6 GND Ground 7 VOL Volume control input 8 MUTE GND CCFL on/off control Panel luminance control (CCFL brightness) Mute control input CN105 (Interface BD to Keypad) Pin Symbol No.
11 RXO3+ plus signal of odd channel 3(LVDS) 12 RXE0- minus signal of even channel 0(LVDS) 13 RXE0+ plus signal of even channel 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 channel 2(LVDS) 20 RXEC- minus signal of even clock channel (LVDS) 21 RXEC+ plus signal of even clock channel (LVDS) 22 RXE3- minus signal of even c
4.8 Key Parts Pin Assignment 4.8.1 IC802 (NCP1337, Power Control IC) Pin Symbol I/O Description 1 BO I Brown−out and external triggering 2 FB I Sets the peak current setpoint 3 CS I Current sense input and overpower compensation adjustment 4 GND 5 DRV O Output driver 6 Vcc I IC supply 7 NC N/A N/A 8 HV I High−voltage pin 4.8.2 IC ground IC501 (OZ9938GN, CCFL inverter controller IC) Pin No.
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 AVDD_DC NC NC GND NC NC AVDD_DC REXT AVDD_PLL BIN0M BIN0P GIN0M GIN0P SOGIN0 RIN0M RIN0P AVDD_ADC REFM REFP HSYNC0 VSYNC0 GND I 30 DDCA_SDA/RS232_TX I/O 31 32 33 34 DDCA_SCL/RS232_RX VDDP GND VDDC I/O I I I I I I I I I I I I I I ADC Power Not connected Not connected Ground Not connected Not connected ADC Power External resistor 390 ohm to AVDD_ADC PLL Power Reference ground for analog blue input Analog blue input Reference ground fo
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 LVA2P LVA2M LVA1P LVA1M LVA0P LVA0M VDDC LVB3P LVB3M LVBCKP LVBCKM LVB2P LVB2M LVB1P LVB1M VDDP GND LVB0P LVB0M GND BYPASS NC VDDC GND RST GPIO_P12 O O O O O O I O O O O O O O O I O O I I I/O A-Link Positive LVDS Differential Data Output A-Link Negative LVDS Differential Data Output A-Link Positive LVDS Differential Data Output A-Link Negative LVDS Differential Data Output A-Link Positive LVDS Differential Data Output A-Link N
5. Adjustment Procedure 5.1 Key Function Description CONTROL KEY KEYS FUNCTION [AUTO] [2] By pressing [AUTO] key, “Auto Image Adjust” is performed [MENU] [1] By pressing [MENU] key, Main menu display [▼] [▲] [POWER] 5.2 A. When “MENU OSD” display, press these keys to change the contents of an adjustment item, or change an adjustment value B.
Information H Position (+ / -) H/V Position Manual Image Adjust V Position (+ / -) H Size +/- Fine Tune +/- Sharpness +/English French German Italian Language Select Spanish Finnish Japanese Setup Menu Simplified Chinese Traditional Chinese Resolution Notice On/Off H Position (+ / -) OSD Position V Position (+ / -) OSD Time Out OSD Background On/Off Memory Recall 5.3.
Can not turn off the LCD; Press the power button will appear "Power Button Locked" Activate Power Lock OSD 3s; [1] + [▼] 10S LCD would automatically turn back "On" when power is restored after a power failure Deactivate Power Lock [1] + [▼] 10S(again) NOTICE: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button Locked” Power should only be lockable in the “On State” 5.3.
internal DAC) If it is a new-built set and it is first time to do the “auto color”, please confirm the following steps: -Connect the VGA cable with the standard video pattern generator and display 5-mosic pattern on the monitor. - Press “Power” to power off the monitor. - Press” [▼] +[▲] +[ ] “simultaneously to enter factory mode. - Press ‘’Menu[1]’’, then press ‘’Auto[2]’’ to execute Auto color item. - After the “Auto Color” process finished, please press “Power” to restart monitor. 5.
(2). Select “Connect”, auto connect for ISP. (3). Select “Run”, start ISP. (4). When the picture show “Verify OK”, ISP finished.
5.7.3 After repair, to ensure the quality you should do the following test and adjustment Item Test OSD function Content Equipment 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. Contrast Check 1. Set input mode to 1280x1024@60Hz 2. Set Pattern to 32 gray shades 3. Set contrast to the max.
Packing For Shipping 1. Packing Procedure 1.1 Paste protection film to protect 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 the accessories into the carton. At last, close the carton and seal it with tape.
Disassembly Procedure iBox Hinge Cover Front Cover ViewSonic Corporation 42 Confidential - Do Not Copy VX1945wm-3
BACK COVER PANEL ViewSonic Corporation 43 Confidential - Do Not Copy VX1945wm-3
CHASSIS P/I BOARD I/F BOARD KEYPAD BOARD SPEAKER LVDS ViewSonic Corporation KEY-POWER CABLE 44 Confidential - Do Not Copy VX1945wm-3
6. Troubleshooting Flow Chart 6.1. Common Acknowledge If you change the interface board, be sure that the U103, U105, U106 and U108 these three components also changed to the new I/F board because there was program inside. If not, please re-write EDID and upload firmware into U106 via VGA Cable. If you adjust clock and phase, please do it at the condition of Windows shut down pattern. If you confirm the R.G.B. color is normal or not, please do it under 16-grey scalar pattern. This LCM is analog interface.
6.2.
6.3. DC output voltage is unstable Unstable power Check sampling Check R822, R823, Circuit R824 Change R822, R823, R824 Check the R pin Check the C pin voltage of IC803 voltage of IC803 if Change about 2.
6.4. Output power is unstable Unstable power Check sampling Check R810, Circuit R811, R818 Change R810, R811, R818 Check the R pin Check the C pin voltage of IC803 voltage of IC803 Change about 2.5V if 3V IC803 Check R809, R808, R814, D809 Check pin1 of Check D806, C815 if IC802 voltage short is 5.
6.5.
6.6.
6.7.
6.8.
7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Serial No.
BOM LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1b Serial No.
8.
EXPLODED PARTS LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1b Serial No. Prefix: QCY Item ViewSonic P/N 1 C-00008190 714030007910R Ref.
ViewSonic Corporation Confidential - Do Not Copy 57 VX1935wm-3
PACKING PART LIST (VX1945wm-3) ViewSonic Model Number: VS11444 Rev: 1a Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ViewSonic P/N N/A N/A N/A P-00008186 A-00008068 A-00008071 CB-00008074 CB-00008075 CB-00008002 CB-00008070 CB-00005254 A-00005255 P-00008185 P-00008170 P-00008184 N/A N/A N/A Ref.
9.
10. Schematic Diagrams Layout guide : 1. Tie the I.C. pin 1,2,3,18,19,20 to ground with a large copper pour (open mask layer) 2 VAROUT_L 4 GND GND 10u/25V 5K1 R701 + + + 13 VS VAROUT_R C707 470u/16V + 1K VOLUME 7 R 4 3 2 1 C713 4700p/50V 2.2K R712 C712 4700p/50V C711 R711 Q701 PMBT3904 1 STBY SVR L CN701 4P 2.0mm 2 MUTE R707 3 2 R708 27K 2.2K Q703 PMBT3904 1 3 5K6 R706 47K 9 MUTE 14 R710 10 R704 10K S_GND OUTR 1K 8 INR 12 R709 1 OUTL 0.
2 1 ADJ VOUT + + C104 0.1/50V C102 C103 0.1/50V C101 VCC3.3 U102 FS8860-18PJ VIN VOUT VCC1.8 2 1 2 3 4 5 6 7 8 VCC5V VCC5V R108 4K7 ON/OFF SBRI ON/OFF R110 4K7 VOL_C MUTE_C CCFL_ENABLE 1 Q106 PMBT3904 22u/25V + C106 0.1/50V C105 1 VCC5V CN101 4500-06 VCC1.8 ADJ 3 VCC3.3 VLCD VLCD 4 R107 390 R163 1 3 Q105 PMBT3906 1K 2 R191 4K7 R106 10K + LED_G_C VCC3.3 C109 0.
CN901 8 7 6 5 4 3 2 1 R901 2K2 8P 1.5mm 90° 3 1 From IF BD LED901 4 3 TACT-4.3 1 1 2 SW903 4 3 1 2 TACT-4.3 4 3 TACT-4.3 2 POWER SW904 1 2 4 3 SW905 1 2 4 3 TACT-4.3 TACT-4.
DVI-D_CON 1K R125 FB101 DDCA_SCL_I 3 R127 100 R129 100 R130 100 R131 100 DDCA_SDA_I 3 R132 100 DDCA_SDA NC NC 33p/50V 220p/50V C123 C124 C125 C126 DDCA_SCL NC NC C121 100 C122 75 1% R135 2K2 2K2 NC C120 R136 R137 75 1% R134 ZD108 5V6 NC ZD107 5V6 C119 ZD106 5V6 75 1% ZD105 5V6 R133 ZD101 5V6 120Ω DET_VGA 3 VSYNC 3 HSYNC 3 9 10 11 12 13 14 15 16 DAT1DAT1+ RX0RX0+ GND RX5RX5+ GND RXC+ RXC- 17 18 19 20 21 22 23 24 DAT0DAT0+ SCL_DVI_I SDA_DVI_I SCL_DVI SDA
R173 R174 R172 10K 0.1/50V C151 0.1/50V C143 0.1/50V 22u/25V C142 0.1/50V 0.1/50V C136 C137 8 7 6 5 8 7 6 5 C139 22u/25V 0.1/50V + C132 VDVI 0.1/50V FB106 60Ω VDDP C131 VCC3.3 0.1/50V C140 1u/16V CN104 FFC-CON C150 0 + 0.1/50V R171 0 + C149 26 REFP REFM 25 NC NC NC X101 14.31818MHz R170 VLCD C138 61 60 59 58 55 54 0.
3 +14V R502 680 C502 2.2u/25V C501 470u/25V 3 R503 1K5 1 R504 33 U501 2 Q501 PMBT3904 ZD501 5V6 0.1/50V C503 R517 10/NC 5V R505 33 C504 1000p/50V R506 3M 3KV C505 T501 1000p/50V SPW-068 1 8 6 2 7 4 3 6 4 5 C508 op1 1 C506 10p/3KV 3 220pF/50V/NC 1 TIMER GNDA 14 4 DIM CT 13 5 ISSEN SSTCMP 12 6 VSEN LCT 11 7 OVPT ENA 10 8 NC NC 9 IC501 OZ9938G U502 1 8 2 7 3 6 4 5 C520 R501 100K 1% R518 470K 1% 0.
10R R827 C805 2200p/400V DC 380V Max. 1000p/500V C813 T801 SPW-055 5uH L802 1 11 1 10 3 2 R812 10K 2 1 ZD801 5V6 NC DRV Vcc NC HV GND CS FB BO R823 51K 1% 4 1 3 2 C812 220p/50V R814 1K PMBT3904 NC Q802 1 R820 1K C821 0.1/100V D806 1N4148 C R825 1K NC R826 200R NC R A R818 200 C824 0.1/50V NC 3 1K R821 14V ZD804 IC801 LTV817M NCP1337 C810 0.1/50V R830 10K 4 3 2 1 R815 12K 1% R822 5K1 1% R819 1K 1 R832 1K2 0.
11.
ViewSonic Corporation 68 Confidential - Do Not Copy VX1945wm-3
ViewSonic Corporation 69 Confidential - Do Not Copy VX1945wm-3
ViewSonic Corporation 70 Confidential - Do Not Copy VX1945wm-3
* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation. Assessment A. What do you think about the content of this Service Manual? Unit Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6.
