Service Manual. ViewSonic VG1930wm-3. Model No. VS Color TFT LCD Display

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Service Manual ViewSonic VG1930wm-3 Model No. VS Color TFT LCD Display (VG1930wm-3_SM Rev. 1a Jan. 2007) ViewSonic 381 Brea Canyon Road, Walnut, California USA - (800) Copyright
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Service Manual ViewSonic VG1930wm-3 Model No. VS Color TFT LCD Display (VG1930wm-3_SM Rev. 1a Jan. 2007) ViewSonic 381 Brea Canyon Road, Walnut, California USA - (800) Copyright Copyright 2007 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. Disclaimer ViewSonic makes no representations or warranties, either 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 this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes. Trademarks Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation. All other trademarks used within this document are the property of their respective owners. Revision History Revision SM Editing Date ECR Number Description of Changes Editor 1a 1/12/2007 Initial Release Jamie Chang i TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 5 3. Front Panel Function Control Description Circuit Description Adjusting Procedure Trouble Shooting Flow Chart Block Diagrams Schematic Diagrams PCB Layout Diagrams Exploded Diagram And Spare Parts List Recommended Spare Parts List 86 ii 1. Precautions and Safety Notices 1. Appropriate Operation (1) Turn off the product before cleaning. (2) Use only a dry soft cloth when cleaning the LCD panel surface. (3) Use a soft cloth soaked with mild detergent to clean the display housing. (4) Use only a high quality, safety approved AC/DC power cord. (5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time. (6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off. (7) Do not touch the LCD panel surface with sharp or hard objects. (8) Do not place heavy objects on the LCD display, video cable, or power cord. (9) Do not use abrasive cleaners, waxes or solvents for your cleaning. (10) Do not operate the product under the following conditions: - Extremely hot, cold or humid environment. - Areas containing excessive dust and dirt. - Near any appliance generating a strong magnetic field. - In direct sunlight. 2. Caution No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar with all of the following safety checks and servicing guidelines. 3. Safety Check Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is exposed in such areas as the associated transformer circuits. 4. LCD Module Handling Precautions 4.1 Handling Precautions (1) Since front polarizer is easily damaged, pay attention not to scratch it. (2) Be sure to turn off power supply when connecting or disconnecting input connector. (3) Wipe off water drops immediately. Long contact with water may cause discoloration or spots. (4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. (5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard surface. (6) Since CMOS LSI is used in this module, take care of static electricity and ensure human earth when handling. (7) Do not open or modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module in any direction. (9) In the event that a Module must be put back into the packing container slot after it was taken out of the container, do not press the center of the CCFL Reflector edge. Instead, press at the far ends of the CFL Reflector edge softly. Otherwise the TFT Module may be damaged. (10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate or tilt the Interface Connector of the TFT Module. (11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration that no 1 bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module may be damaged. (12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local ordinances or regulations for disposal. (13) The LCD module contains a small amount of materials having no flammability grade. The LCD module should be supplied with power that complies with the requirements of Limited Power Source (IEC60950 or UL1950), or an exemption should be applied for. (14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950 or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit 2 Correct methods : Incorrect Methods : Only touch the metal-frame of the panel or the front Surface of the panel is pressed by fingers & this may cover of the monitor. cause MURA Do not touch the surface of the polarizer. Take out the monitor form carton. Take out the monitor by grasping the LCD panel. That may cause MURA. 3 Correct methods : Incorrect Methods : Place the monitor on a clean & soft foam pad. Place the monitor on foreign objects. That could scratch the surface of panel 4 2. Specification Introductions FEATURES VG1930wm-3 Size 19 W Luminance (Typ) 300 cd/ m2 Contrast Ratio (Typ) 700:1 TFTLCD PANEL Colors 16.2 M colors Response Time (Typ) 5 ms Viewing Angle (H/V) Recommend resolution 1440 X Input Signal Analog (75ohms, 0.7/1.0 Vp-p) Yes Digital Yes Separate Sync Yes Sync Compatibility Composite Sync Yes Sync on Green Yes PC Yes Compatibility Power Mac Yes TV Box (NextVision 6) No Power Voltage AC V, 50/60Hz Yes Power Consumption On Mode(Max / Typ) 36 W Active Off Mode (Max) 2 W Audio W 1.5w X 2 Tilt -5 ~ 20 Ergonomics Swivel ( -xx - xx ) 360 Pivot ( XX - XX ) No Height Adjust ( XX-XX mm) 0-80mm OSD Control [ ] [ 1 ] [ 2 ] [ ] [ ] [ X] Yes Dimension Physical (W x H x D) 460 mm (W) x 434 mm (H) x 230 mm (D) 18.1 (W) x 17.1 (H) x 9.1 (D) Package (W x H x D) 560 mm (W) x 525 mm (H) x 282 mm (D) 22 (W) x 20.7 (H) x 11.1 (D) Weight Physical (lbs / Kg) 5.5 Kg (12.13 lbs) Package (lbs / Kg) 7.3 Kg (16.10 lbs) Operating Condition Temperature ( / ) 32 F to 104 F (0 C to 40 C) Humidity (%) 10% to 90% (no condensation) Storage Condition Temperature ( / ) -4 F to 140 F (-20 C to 60 C) Humidity (%) 10% to 90% (no condensation) UL, CUL, FCC-B (ICES), CB, CE, TCO'03, ICES-003B, ISO , TUV/GS, TUV ERGO(covers ISO & Regulation MPRII), TUV-S, VCCI, NOM, GOST-R, HYGIENIC (20 copies), ENERGY, Energy Star, CCC, BSMI, PSB, C-TICK, KTL/MIC, SASO, WEEE, RoHS 5 Product definition and specification Product Name Oracle P/N Model Number OSD Languages ViewSonic VG1930wm VG1930WM-3 VS11419 English, French, German, Italian, Spanish, Finnish, Japanese, Traditional Chinese, Simplified Chinese TFT LCD Panel and Model # CMO M190A1-L02 Scalar MST TSUM56AL-LF-1 Input Signal Analog x1 / Digital x1 Sync Compatibility Separate Sync / Composite Sync / SOG Adapter Internal Power Board Yes, Power Cable refer to APPENDIX B: Power Cable Analog Cable (1.8 m, black), with PC 2001 and Hot 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 2001 No USB Cable (V2.0) No ViewSonic CD Wizard Arabic, English, Finnish, Spanish, German, Italian, Japanese, Swedish, Polish, Korean, Portuguese, Russian, ViewSonic Quick Start Guide Turkish, French, Czech, Hungarian, Simplified Chinese, Traditional Chinese PerfectSuite CD No Screen Protector Mylar Yes Foot Protector plastic No Service Insert For Region code = M units only Warranty Sticker For Region code = G units only Warranty Card For Region code = G units only Carton Sticker For Region code = G units only PE bag of Carton For Region code = G units only 6 2.2 GENERAL specification Test Resolution & Frequency Test Image Size Contrast and Brightness Controls Hz Full Size Factory Default: Contrast = 70%, Brightness = 100% 2.3 VIDEO INTERFACE Input Connector(refer the appendix A) Analog : D-sub 15, Digital: DVI-D 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 Refer to Appendix A; Compliant DDC/CI Video RGB (Analog) Video Signals Separate Sync / Composite Sync / SOG TMDS (Digital) Video Impedance 75 Ohms (Analog), 100 Ohms (Digital) Maximum PC Video Signal 950 mv with no damage to monitor Maximum Mac Video Signal 1250 mv with no damage to monitor Sync Signals TTL DDC 1/2B Compliant with version 1.1 Sync Compatibility Separate Sync / Composite Sync / SOG Video Compatibility Shall be compatible with all PC type computers, Macintosh computers, and after market video cards Resolution Compatibility Refer to Segment 4-5 Exclusions Not compatible with interlaced video 2.4 POWER SUPPLY Internal Power Supply Mirage 860-AB0-190DTLB-PVH Input Voltage Range 90 to 264 VAC Input Frequency Range 47 to 63 Hertz Short Circuit Protection Output can be shorted without damage Over Current Protection 5A typical at 14.0 VDC Leakage Current 3.5mA (Max) at 254VAC / 60Hz Efficiency(at 115VAC Full Load) Typical: 80% Minimum: 75% Fuse Internal and not user replaceable Power Dissipation 39 Watts (typ) / 49.2W (max) Max Input AC Current VAC, 0.75 Inrush Current (Cold Start) 50 A 115VAC 90 A 230VAC 7 Power Supply Cold Start Power Supply Transient Immunity Power Supply Line Surge Immunity Power Supply Missing Cycle Immunity Power Supply Acoustics Power Saving Operation(Method) Shall start and function properly when under full load, with all combinations of input voltage, input frequency, and operating temperature. Shall be able to withstand an ANSI/IEEE C V 200 ampere ring wave transient test with no damage. Shall be able to withstand 1.5 times nominal line voltage for one cycle with no damage. Shall be able to function properly, without reset or visible screen artifacts, when ½ cycle of AC power is randomly missing at nominal input. The power supply shall not produce audible noise that would be detectable by the user. Audible shall defined to be in compliance with ISO 7779 (DIN EN27779:1991) Noise measurements of machines acoustics. Power Switch noise shall not be considered. VESA DPMS Signaling Power Consumption Recovery Time Mode LED Power Consumption On Blue 34W (typ) 36W (max) Active off Amber 2W Off Off 1W ON Mode = N/A, ACTIVE OFF 3 sec 8 2.5 ELECTRICAL REQUIREMENT Horizontal / Vertical Frequency Horizontal Frequency Vertical Refresh Rate Maximum Pixel Clock Sync Polarity khz Hz. 135 MHz Independent of sync polarity Timing Table Item Timing Analog SOG Composite Separated Digital - TMDS Remark x 70 Hz, 31.5 KHz DMT x 60 Hz, 31.5 KHz x 70 Hz, 31.5 KHz x 50 Hz, 24.7 KHz x 60 Hz, 31.5 KHz DMT x 67 Hz, 35 KHz For MAC x 72 Hz, 37.9 KHz DMT x 75 Hz, 37.5 KHz DMT x 70 Hz, 31.5 KHz x 60 Hz, 31.5 KHz DTV x 50 Hz, 31.3 KHz DTV x 56 Hz, 35.1 KHz DMT x 60 Hz, 37.9 KHz DMT x 72 Hz, 48.1 KHz DMT x 75 Hz, 46.9 KHz DMT x 75 Hz, 49.7 KHz MAC x 60 Hz, 48.4 KHz DMT x 70 Hz, 56.5 KHz DMT x 75 Hz, 60 KHz DMT x 75 Hz, 67.5 KHz DMT x 75 Hz, 68.7 KHz For MAC x 67 Hz, 62.5 KHz For SUN x 50 Hz, 37.5 KHz DTV x 60 Hz, 45 KHz DTV x 60 Hz, 47.8 KHz DMT; x 75 Hz, 60.3 KHz DMT; x 60 Hz, 59.7 KHz DMT x 75 Hz, 75.2 KHz 9 x 60 Hz, 64 KHz DMT x 75 Hz, 80 KHz DMT x 60 Hz 55.9 KHz DMT *1. Tolerance ±2KHz (if no overlapping issue) *2. Any timing not in 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 60Hz User Presets Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration Changing Modes Maximum Mode Change Blank Time for image stability : 5 seconds (Max), excluding Auto Adjust time Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute Auto Adjust The monitor needs to do Auto Adjust the first time a new mode is detected (see section 0-Touch Function Actions ) While running Change Mode, Auto Adjust or Memory Recall, the image shall blank 10 2.6 FRONT PANEL CONTROLS AND INDICATORS Front Panel Hardware Controls Power Switch (Front Head) Power LED (Front Head) Front Panel Controls (Head) [ X] [ 1 ] [ ] [ ] [ 2 ] [ ] Power Control, soft Power Switch. Blue ON Orange Power Saving Mode Dark = Soft Power Switch OFF X] Mute [ ] Power [ 1 ] BUTTON 1 [ 2 ] Button 2 [ ] UP ARROW BUTTON [ ] DOWN ARROW BUTTON Reaction Time Note: Power Button, Button 1 and Button 2 must be one-shot logic operation. (i.e. there should be no cycling) OSD must fully appear within 0.5s after pushing Button 1 Short Cuts Function from the button(s) [2] Input toggle (Analog or Digital; refer to Appendix D) [ ] or [ ] Brightness/Contrast adjust [ ]+ [ ] recall both of Contrast and Brightness to default [1] + [2] toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode (70Hz only) [1] + [ ] + [ ] White Balance. (Not shown on user s guide) [1] + [ ] Power Lock [1] + [ ] OSD Lock No signal + [2] + [ ] Burning mode Signal + [2] + [ ] Factory Mode Remark : All the short cuts function are only available while OSD off Function descriptions Main Menu Controls The Main Menu OSD includes most of control functions. Please refer to APPENDIX C (Main Menu OSD Table) for the detail. 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 11 (1), & ( ) again for 10 seconds. Note1: When the OSD is locked will lock all functions, including Volume and Mute Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate OSD Locked Note 3: OSD Lock should not lock Power Button and Power Lock function Power Lock short cuts function for the buttons The power button lock will be activated by pressing the front panel control buttons (1), & ( ) for 10 seconds. Locking the power button means that the user won't be able to turn off the LCD while the power button is locked. If the user presses the power button while it is locked, a message will appear on the screen for 3 seconds showing Power Button Locked . It also means that with the power 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 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. Note 1: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate Power Button Locked Note 2: Power should only be lockable in the On State Memory Recall Actions Memory Recall action on the analog and digital mode as below 1. Recall white balance to factory setting 2. Set the factory defaults as shown in Section Clean all the mode setting buffer 4. Execute Auto Image Adjust Note: Memory Recall should have no effect for Language, Power Lock, User Color Settings or Input Priority Input Signal Notice Actions 1. The Input Signal Notice OSD appears 3 seconds when power turns on or change input signal. 2. The Input Signal Notice OSD position is on the right-bottom side of image. And the OSD background shall be transparent. (OSD Background = off). Resolution Notice Actions 1. Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec 2. For auto input select function, it shall meet the requirement in Appendix D. 3. The OSD should disappear after 10 sec or by pushing button [1] or [2] Resolution Notice function should be disabled when push button [2] under Resolution Notice OSD 12 0-Touch Function Actions 1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer for 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% Input Priority N/A Brightness 100% Resolution Notice On Color Temperature 6500K Volume 50% Sharpness 100% Balance N/A OSD H. Position 50% Treble N/A OSD V. Position 50% Bass N/A OSD Time Out x400 / 640x x400 OSD Background On 2.7 AUDIO INTERFACE (SPEAKER SPECIFICATION) Line input connection Line input signal Line input impedance Maximum power output (Electric) Signal to Noise Ratio Frequency response Distortion Vibration Screen image Connector PC99 requirement Audio in Cable type / length 3.5 mm stereo jack 1.0 Vrms 10 kohm 1.5 W / ch 50 db 100 Hz 20 Khz 10 % THD There should be no audible vibration with volume at 100% and treble / bass at default. There should be no affect on the screen image stability under any conditions. Lime Green pantone # 577C 3.5mm stereo cable / 1.8m length Speakers should be off when the rest of the monitor is in power Audio DPMS saving. * No any sympathetic or abnormal noise allowed. 13 TFT LCD PANEL 1 st Source Panel Model number CMO M190A1-L02 Type Active Matrix TFT, TN technology Active Size 19 Wide (410.4mm x 256.5mm) Pixel Arrangement RGB Vertical Stripe Pixel Pitch mm Glass Treatment Anti-Glare, Hard coating (3H) # of Backlights 4 CCFL Backlight Life Hrs (Min) Luminance (Center) 300 cd/m2 (Typ after 30 minute warm up) CT = 6500K, 230 cd/m2 (Min after 30 minute warm up) Contrast/ Brightness = Max Brightness Uniformity (13 points) 77 % (Typ) / 67 % (Min) Contrast Ratio 700 :1 (Typ) 500 : 1 (Min) Color Depth 16.2 million colors (6+2 bit panel) Horizontal Viewing Angle 150 degrees (Typ) / 130 degrees CR 10 Vertical Viewing Angle 130 degrees (Typ) / 120 degrees CR 10 Response Time On-Off Ta=25 C 5ms (Typ) / 15ms (Max) Mercury 3.0 mg per lamp Panel Defects Please see Panel Quality Specifications. 14 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 Audio Mute button turns the sound off Displays the Main Menu or exits the control screen and saves adjustments. Scrolls 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 between two controls on some screens. Also a shortcut to toggle analog and digital connection. 15 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, press or to 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. The command line at the bottom of the control screen tells 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 buttons. 5. To
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