ViewSonic VS10931 User manual

Service Manual
ViewSonic VE920m-1
VE920mb-1
Model No. VS10931
19” Color TFT LCD Display
(VE920m-1_VE920mb-1_SM Rev. 1b Aug. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA- [phone]

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Copyright
Copyright © 2006by 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 05/26/2006 Initial release J. Chang
1b Add RSPL BOM EPL for VE920mb-1 J. Chang
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8/28/2006

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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 4
3. Front Panel Function Control Description 8
4. Circuit Description 13
5. Adjustment Procedure 14
6. Troubleshooting Flow Chart 49
7. Recommended Spare Parts List 57
8. Exploded Diagram and Exploded Parts List 61
9. Block Diagram 64
10. Schematic Diagrams 65
11. PCB Layout Diagrams 75
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1. Precautions and Safety Notices
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.
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(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 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
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Correct methods : Incorrect Methods :
Only touch the metal-frame of the panel or the front cover of
the monitor.
Do not touch the surface of the polarizer .
Surface of the panel is pressed by fingers & this may cause
“MURA “
Take out the monitor with cushion Take out the monitor by grasping the LCD panel.
That may cause “MURA“.
Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .
That could scratch the surface of panel
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2. Specification
Introduction
FEATURES
Size 19”
Luminance (Typ, cd/㎡)280 cd/㎡
Contrast Ratio (Typ) 450:1
Colors ( 6 bit + 2 bit FRC) 16.2 M colors
Response Time (Typ) 8 ms
ViewingAngle (H/V) 150 ° / 130 °
TFTLCD PANEL
Recommend resolution 1280x1024@60Hz
Analog (75ohms, 0.7/1.0 Vp-p) Yes
Input Signal Digital Yes
Separate Sync Yes
Composite Sync No
Sync Compatibility Sync on Green No
PC Yes
Power Mac Yes
Compatibility TV Box (NextVision 6) Yes
Power Voltage AC 100-240V, 50/60Hz Yes
On Mode(Max / Typ) 58W
Power Consumption Active Off Mode (Max) 2W
Audio 1.2 W (audio), 2W*2 (speaker) Yes
Tilt (20 ° to -5 °)Yes
Swivel No
Pivot No
Ergonomics
HeightAdjust No
OSD Control [XX] [ 1 ] [▼] [▲] [ 2 ] [ ] Yes
Physical (W x H x D mm) 423 x 434 x 221 (mm)
16.7 x 17.1 x 8.7 (in)
Dimension Package (W x H x D mm) 474 x 475 x 184 (mm)
17.6 x 18.7 x 7.2 (in)
Physical (Net kg/lb) 5.2 kg / 11.5 lb
Weight Package (Gross Kg/lb) 6.8 kg / 15.0 lb
Temperature (℉/℃)41℉-95℉/+5℃-+35℃
Operating Condition Humidity (%) 20 % -80 %
Temperature (℉/℃)-4℉-131℉/-20℃-55℃
Storage Condition Humidity (%) 20 % -85 %
Regulation
UL, cUL, FCC-B, CB, CE, NOM, TUV/GS, TUV ERGO (covers ISO13406-2 & MPRII),
TCO03, GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC,
(PSB), (C-TICK), TUV-S, Green Mark, energy star
HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark,
energy star
GENERAL specification
Test Resolution & Frequency 1280x1024 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default:
Contrast = 70%, Brightness = 100%
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VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Digital Input Connector N/A
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 2B
Video Signals
1. Video RGB (Analog)
2. DVI (Digital)
Separate
Video Impedance 75 Ohms (Analog)
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 2B Compliant with Revision 1.3
Sync Compatibility Separate Sync
Video Compatibility Shall be compatible with all PC type computers, Macintosh computers,
and after market video cards
Resolution Compatibility
640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x 600, 832 x 624,
1024 x 768, 1152 x 870, 1280 x 720, 1280 x 960, 1280 x 1024
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video
POWER SUPPLY
Power Supply (Adapter) Part Number: 27-D003115
Input Voltage Range 100 to 240 VAC
Input Frequency Range 50 to 60 Hertz
Short Circuit Protection OUTPUT CAN BE SHORTED WITHOUT DAMAGE
Over Current Protection 3.3~4.5 A typical at 5 VDC
Leakage Current 3.5 MA (MAX) AT 254VAC / 60HZ
Efficiency 80 % TYPICAL AT 115 VAC FULL LOAD
Fuse INTERNAL AND NOT USER REPLACEABLE
Power Dissipation 58 (Max) Watt
Max Input AC Current 1.8 A RMS @ 100 VAC,
Inrush Current (Cold Start) 120A(MAX) @ 240VAC , 50HZ
Power Supply Cold Start SHALL START AND FUNCTION PROPERLY 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 EN61000-4-4 ±2KV TRANSIENT
TEST WITH NO DAMAGE
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Power Supply Line Surge Immunity Shall be able to withstand ±2KV (L-L) and ±2.3KV (L-PE) with no damage
Power Supply Missing Cycle Immunity Shall be able to function properly, without reset or visible screen artifacts, when
½ cycle of AC power is randomly missing at nominal input
Power Supply Acoustics
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
US Type Power Cable Separate 3-prong NEMA 5-15P type plug. Length = 1.8m. Connects to display.
Color = Black
European Type Power Cable
Schuko CEE7-7 type plug.
Length = 1.8m, Connects to display.
Color = Black
CCC Type Power Cable
Separate 3-prong type plug.
Length = 1.8m. Connects to display.
Color = Black
Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption ON Mode < 58 W(max)
ACTIVE OFF < 2W
Recovery Time ON Mode = N/A, ACTIVE OFF < 3sec
2.5 ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 30 –82 kHz
Vertical Refresh Rate 50 –85* Hz.
Maximum Pixel Clock 135 MHz (EDID file is 140MHz)
Sync Polarity Independent of sync polarity.
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Timing Table
Item Timing Analog Digital
1640 x 350 @ 70Hz, 31.5kHz Yes No
2640 x 400 @ 60Hz, 31.5kHz Yes* No
3640 x 400 @ 70Hz, 31.5kHz Yes No
4640 x 480 @ 60Hz, 31.5kHz Yes No
5640 x 480 @ 67Hz, 35.0kHz Yes No
6640 x 480 @ 72Hz, 37.9kHz Yes No
7640 x 480 @ 75Hz, 37.5kHz Yes No
8640 x 480 @ 85Hz, 43.27kHz Yes No
9720 x 400 @ 70Hz, 31.5kHz Yes No
10 800 x 600 @ 56Hz, 35.1kHz Yes No
11 800 x 600 @ 60Hz, 37.9kHz Yes No
12 800 x 600 @ 75Hz, 46.9kHz Yes No
13 800 x 600 @ 72Hz, 48.1kHz Yes No
14 800 x 600 @ 85Hz, 53.7kHz Yes No
15 832 x 624 @ 75Hz, 49.7kHz Yes No
16 1024 x 768 @ 60Hz, 48.4kHz Yes No
17 1024 x 768 @ 70Hz, 56.5kHz Yes No
18 1024 x 768 @ 72Hz, 58.1kHz Yes No
19 1024 x 768 @ 75Hz, 60.0kHz Yes No
20 1024 x 768 @ 85Hz, 68.67kHz Yes No
21 1152 x 870 @ 75Hz, 68.7kHz Yes No
22 1280 x 1024 @ 60Hz, 63.4kHz Yes No
23 1280 x 1024 @ 75Hz, 79.97kHz Yes No
24 1280x 720 @ 60Hz, 45kHz (HDTV) Yes No
Note 1:When Vertical frequency at 85Hz or resolution, the vertical image size might not be full screen. But the
vertical image position should be at the center.
Note2: *: The vertical image size might not be full screen.
Primary Presets
1280x1024 @ 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 : 3 seconds (Max), excluding “Auto Adjust” time
●Under DOS mode (640 x 350, 720 x 400 & 640 x 400), there is no “Auto Adjust” feature.
●The monitor needs to do “Auto Adjust” the first time a new mode is detected but except the DOS mode 640 x 350, 720 x
400 & 640 x 400.(see section “0-Touch™ Function Actions”)
●While running Change Mode, Auto Adjust or Memory Recall, the image shall blank
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