Service Manual ViewSonic VX1935wm-3 Model No. VS11444 19” Color TFT LCD Display (VX1935wm-3_SM Rev. 1a Oct.
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 13 4. Circuit Description 21 5. Adjustment Procedure 33 6. Troubleshooting Flow Chart 45 7. Recommended Spare Parts List 53 8. Exploded Diagram and Exploded Parts List 56 9. Block Diagram 60 10. Schematic Diagrams 61 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.
Handling and Placing Methods ViewSonic Corporation Confidential - Do Not Copy 2 VX1935wm-3
ViewSonic Corporation Confidential - Do Not Copy 3 VX1935wm-3
2. Specification 1. INTRODUCTION FEATURES TFTLCD PANEL 1st Innolux MT190AW01 V.0 VX1935wm-3 Size 19 " wide Luminance (Typ) 300 cd/㎡ 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 Input Signal Sync Compatibility Compatibility Power Voltage Power Consumption Audio Ergonomics OSD Control Dimension Weight Operating Condition Storage Condition 1440x900@60Hz Analog Yes (75ohms, 0.7/1.
2. GENERAL specification Test Resolution & Frequency 1440x900 @ 60Hz Test Image Size Full Size Contrast and Brightness Controls 3. Factory Default: Contrast = 70%, Brightness = 100% VIDEO INTERFACE Analog Input Connector DB-15 (Analog), Digital Input Connector DVI-D (Digital), Default Input Connector Defaults to the first detected input Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes Video Cable Connector DB-15 Pin out Compliant DDC 1/2B 1.
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 40 A (max) @ 120VAC Inrush Current (Cold Start) 60 A (max) @ 220VAC Shall start and function properly when under full load, with all combinations of input voltage, input frequency, and operating Power Supply Cold Start temperature. Shall be able to withstand an ANSI/IEEE C62.
5. ELECTRICAL REQUIREMENT Horizontal / Vertical Frequency Horizontal Frequency 30 – 82 kHz Vertical Refresh Rate 56 – 75 Hz Maximum Pixel Clock 135 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.
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, 47.8 KHz 30 1280 x 768 @ 75 Hz, 60.
2.6 FRONT PANEL CONTROLS AND INDICATORS Front Panel Hardware Controls Power Switch (Front Head) Power Control, soft Power Switch. Power LED (Front Head) Blue – ON Orange –Power Saving Mode Dark = Soft Power Switch OFF [ 1 ] BUTTON 1 [ 2 ] Button 2 Front Panel Controls (Head) [ 1 ] [ 2 ] [ ] [▼] [▲] [ ] Power [▼] DOWN ARROW BUTTON [▲] Up arrow button Note: Power Button, Button 1 and Button 2 must be one-shot logic operation. (i.e.
"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 power is restored after a power failure. The power button lock will be deactivated by pressing the front panel control buttons "(1), & (▼)" again for 10 seconds.
2.7 AUDIO INTERFACE (SPEAKER SPECIFICATION) Line input signal 1 Vrms Line input impedance 10 kOhm Maximum Amp power output (Watt) 2.0 W (RL=8Ω) Speaker Power rating(Ω/Watt) 8Ω/2 W (typ.) ; 8Ω/ 3 W (max) THD 10% Signal to Noise Ratio 75 dB Frequency response 200 Hz – 20 Khz SPL. 82 ± 3 dB Line input connection 3.5 mm stereo jacks (Maxmum output @ 1KHZ) There should be no audible vibration resonance at Vibration volume=100% & treble / bass in def.
VGA up to 1440 x 900 non-interlaced COMPATIBILI PC 3.
Traditional Chinese, Simplified Chinese], Resolution Notice, OSD Position, OSD Timeout, OSD Background Short Cut Memory Recall [1]: Main Menu [2]: Input Select [▲] or [▼]: Brightness/Contrast [▲] + [▼]: Recall Contrast and Brightness [1] and [▼]: Power lock/unlock [1] and [▲]: OSD lock/unlock *1 These functions are not available in Digital Mode *2 These functions are not available under sRGB Mode *3 These functions are not available under Native Resolution Mode *4 These functions setting can be recalled to
RELIABILITY MTBF 100,000hrs (demonstrated) excluding Light source Light Source MTBF: 40K hrs (Min) POWER "On" Green Normal SAVING "Sleep" Amber <2W FUNCTION "Off" <1W LOGISTICS Container Load 20’/40’ 560/1120 pcs (Palletized) Pallet Load Air/Sea 56/56 pcs UPC-A Code 7 66907 21621 9 ITF-14 Code 0 07 66907 21621 9 Serial Format QCXyywwxxxxx Country of China Origin SECURITY Wall Mount Kennsington lock on the bottom right side VESA 100mm x 100mm ACCESSORI Power Cable ES 15 Pin VG
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 VX1935wm.
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.
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.
not be increased. 4. 2 Inverter Circuit 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.
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. Signal DDC-SCL inputs via CN103 #15, and then passes through ZD101 for ESD protection, goes into EDID EEPROM IC U103.
4.4 FACTORY PRESET TIMING TABLE FH(KHz) Sync Total FV(Hz) Polarity (Dot/Line) 31.469 + 800 640 96 48 70.086 − 449 350 2 60 IBM 31.469 − 800 640 96 48 640*400@70Hz 70.086 + 449 400 2 35 IBM 31.469 − 900 720 108 54 720*400@70Hz 70.087 + 449 400 2 35 24.700 − 800 640 96 48 50.000 − 494 480 2 8 VESA 31.469 − 800 640 96 40 640*480@60Hz 59.940 − 525 480 2 25 35.000 − 864 640 64 96 66.667 − 525 480 3 39 VESA 37.
VESA 68.677 + 1376 1024 96 208 1024*768@85Hz 84.997 + 808 768 3 36 57.700 − 1360 1024 136 144 72.125 − 800 768 6 26 VESA 67.500 + 1600 1152 128 256 1152*864@75Hz 75.000 + 900 864 3 32 MAC 68.681 − 1456 1152 128 144 1152*870@75Hz 75.062 − 915 870 3 39 VESA 60.000 + 1800 1280 112 312 1280*960@60Hz 60.000 + 1000 960 3 36 75.000 + 1800 1280 112 312 75.000 + 1000 960 3 36 VESA 63.981 + 1688 1280 112 248 1280*1024@60Hz 60.
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.
AC Outlet Pin Assignment Pin Symbol Description 1 L Live 2 N Neutral 3 E GND 3 4.6 1 2 P801 4.7 Inner Connector Pin Assignment 4.7.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent) Pin Symbol Description 1 H.V. High voltage for lamp 2 L.V. Low voltage for lamp 4.7.2 CN101 (Power BD to Interface BD) Pin No. Symbol Description 1 VCC5V +5.1V INPUT 2 VCC5V +5.
4.7.4 CN104 (Connect I/F BD to panel, FI-X30S-H or Equivalent) Pin No.
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 IC ground 4.8.2 IC501 (OZ9938GN, CCFL inverter controller IC) Pin No.
5 GND Ground 6 NC Not connected 7 NC Not connected 8 AVDD_DC 9 NC Not connected 10 NC Not connected 11 GND Ground 12 NC Not connected 13 NC Not connected 14 AVDD_DC 15 REXT 16 AVDD_PLL I PLL Power 17 BIN0M I Reference ground for analog blue input 18 BIN0P I Analog blue input 19 GIN0M I Reference ground for analog green input 20 GIN0P I Analog green input 21 SOGIN0 I Sync-on-green input 22 RIN0M I Reference ground for analog red input 23 RIN0P I An
General Purpose Input/Output; 4mA driving strength/I2C Master 43 GPIO_P11/I2C_MDA I/O 44 GPIO_P10/I2C_MCL I/O 45 46 47 NC NC NC 48 GPIO_P27/PWM1 49 VDDP 50 GND 51 VDDC I Digital Core Power 52 MODE[0] I Chip Configuration Input 53 MODE[1] I Chip Configuration Input 54 LVA3P O A-Link Positive LVDS Differential Data Output 55 LVA3M O A-Link Negative LVDS Differential Data Output 56 VDDP I Digital Output Power 57 GND 58 LVACKP O A-Link Positive LVDS Differential Clock
81 NC 82 VDDC 83 GND 84 RST 85 GPIO_P12 I/O 86 PWM1/GPIO_P25 I/O 87 RSTN 88 GPIO_P00/SAR1 I/O 89 GPIO_P01/SAR2 I/O 90 GPIO_P02/SAR3 Not connected I Digital Core Power Ground I I I/O Chip Reset; High Reset General Purpose Input/Output; 4mA driving strength Pulse Width Modulation Output; 4mA driving strength/General Purpose Input/Output; 4mA driving strength Chip Reset; Low Reset General Purpose Input/Output; 4mA driving strength/SAR ADC Input General Purpose Input/Output; 4mA dri
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 A. When “MENU OSD” display, press these keys to change the contents of an adjustment item, or change an adjustment value [▼] [▲] B. When “MENU OSD” is un-display, press these keys to change brightness and contrast [POWER] 5.
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.
5.3.
5.4 Burn-in pattern If it is a new monitor, and in factory mode, if no VGA signal input, Burn-in pattern will self generate automatically. Burn in patterns are: full Red, Green, Blue, White and Black. You can not escape from Burn-in pattern until plug in VGA Cable or press the power key to turn the monitor off and then turn it on. 5.
5.7.2 Using mStar ISP Tool Update FW: (1). Select “Read”, Choose the corresponding firmware, load to MCU. (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 Content Equipment 1.Signal is set as 1280x1024@60Hz Test OSD function 2. LCM button are from left to right, checking whether each single function key and compound function key can be worked. Chroma Signal Generator 1. Set input mode to 1280x1024@60Hz Contrast Check 2. Set Pattern to 32 gray shades Chroma 3. Set contrast to the max.
Y measurement at default setting 1. Set brightness to default value 100 and contrast to default value Chroma Signal Generator and Color 70 at 6500K 2. At full white patter, Measure Y, which should be ≥ 250cd/m² Analyzer 1. Mode: 1280x1024@60Hz Panel Flicker check 2. Set Brightness& contrast to default value Equipment:: 3. Do “Auto Image Adjust” Chroma Signal 4. Shut down PC to check whether there’s glitter on the center of the Generator & PC picture. Power saving 1. Mode: 1440x900@60Hz 2.
Packing For Shipping And Disassembly Procedure 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 BASE HINGE COVER ViewSonic Corporation Confidential - Do Not Copy 41 VX1935wm-3
STAND FRONT COVER ViewSonic Corporation Confidential - Do Not Copy 42 VX1935wm-3
BACK COVER PANEL ViewSonic Corporation Confidential - Do Not Copy 43 VX1935wm-3
CHASSIS P/I BOARD I/F BOARD KEYPAD BOARD SPEAKER LVDS ViewSonic Corporation KEY-POWER CABLE Confidential - Do Not Copy 44 VX1935wm-3
6. Troubleshooting Flow Chart 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.
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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.
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.
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7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VX1935wm-3) Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ViewSonic Model Number: VS11444 Serial No.
ViewSonic Model Number: VS11444 Rev: 1a Serial No.
Item 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 ViewSonic P/N N/A C-00008191 N/A N/A N/A HW-00005270 N/A HW-00005269 N/A E-00008016 N/A N/A B-00008169 B-00008170 B-00008171 CB-00008071 CB-00008072 N/A N/A N/A N/A N/A N/A N/A Ref.
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EXPLODED PARTS LIST (VX1935wm-3) ViewSonic Model Number: VS11444 Rev: 1a Serial No. Prefix: QCX Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 A B C D E F G H ViewSonic P/N C-00008190 E-00008016 B-00008171 B-00008169 CB-00008071 N/A N/A N/A E-00008137 C-00008191 N/A C-00008187 C-00008188 B-00008170 CB-00008072 N/A PL-00008048 C-00008189 HW-00005269 HW-00005270 N/A N/A N/A N/A N/A N/A ViewSonic Corporation Ref.
ViewSonic Corporation Confidential - Do Not Copy 58 VX1935wm-3
PACKING PART LIST (VX1935wm-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 ViewSonic P/N N/A N/A N/A P-00008179 CB-00008002 A-00005255 P-00008182 C-00008189 P-00008180 CB-00008070 CB-00005254 P-00008178 P-00008032 P-00008177 N/A N/A N/A Ref.
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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% C526 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 + 7 6 GND CS FB BO 4 1 3 2 IC801 LTV817M C812 220p/50V NCP1337 C810 0.1/50V R823 51K 1% 4 3 2 1 R815 12K 1% 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 2 DRV Vcc NC HV R830 10K 3 R832 1K2 0.
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ViewSonic Corporation 69 Confidential - Do Not Copy VX1935wm-3
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* 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.
