ViewSonic VE150m User manual

ViewSonic VE150m/mb
Model No.VLCDS22574-1/-1b
Service Manual
15” Color TFT LCD Display
(VE150m/VE150mb-1_SM_399 - Rev. 1a – Dec 2002)
ViewSonic “381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-858
3

Copyright
Copyright © 2002 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
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 Date Description Approval
1a 11/17/02 Initial Release DCN-2806 C.Shen
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TABLE OF CONTENT
WARNING ......................................................................................1
SAFETY PRECAUTIONS...............................................................1
CHAPTER 1 PREFACE.........................................................3
CHAPTER 2 SPECIFICATIONS..........................................6
2.1 Scope.............................................................................................. 6
2.2 General Requirement.......................................................................7
2.3 Signal Interface ................................................................................7
2.4 Power................................................................................................8
2.5 Front Panel Controls and Indicators................................................ 10
2.6 Electrical Requirements .................................................................. 11
2.7 Audio............................................................................................... 12
2.8 LCD Panel....................................................................................... 13
2.9 Image Perfromance......................................................................... 14
CHAPTER 3 FRONT PANEL CONTROLS .........................15
3.1 Adjusting the Screen Image ............................................................ 15
3.2 Do the following to adjust the screen image:................................... 16
3.3 Main Menu Controls ........................................................................ 17
CHAPTER 4 CIRCUIT DESCRIPTION ...............................21
4.1 Main Board...................................................................................... 21
CHAPTER 5 TROUBLESHOOTING ...................................26
5.1 Equipment....................................................................................... 26
5.2 Main Procedure............................................................................... 26
CHAPTER 6 THEORY OF OPERATION ............................34
6.1 System Block Diagram.................................................................... 34
6.2 System Circuitry Description ........................................................... 35
CHAPTER 7 MECHANICAL ASSEMBLY............................36
CHAPTER 8 RECOMMENDED SPARE PARTS LIST ........40
CHAPTER 9 COMPLETE PARTS LIST ...........................42
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10.2 Micro Controller and LCD power control ......................................... 54
10.3 VGA input........................................................................................ 55
10.4 OutputConnector.......................................................................... 56
10.5 DC-DC ............................................................................................ 57
10.6 Audio............................................................................................... 58
CHAPTER 11 PCB LAYOUT .................................................59
CHAPTER 10 CIRCUIT DIAGRAMS.....................................53
10.1 Micro-Controller MRT MV ............................................................... 53
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WARNING
This service information is designed for experienced repair technicians,
do not attempt to do any form of disassembling or adjustment for the
product.
It does not contain warnings or cautions to advise non-technical individuals of
the potential dangers in attempting to service the product.
Products powered by electricity should be serviced or repaired only by
experienced professional technicians.
Any attempts to service or repair the inner products may cause serious injury.
SAFETY PRECAUTIONS
Warning: This device must be operated with the original power supply
CAUTION: Use a power cable that is properly grounded. Always use the
appropriate AC cord that is certified for the individual
country. Some examples are listed below:
USA .....................UL Switzerland........ SEV
Canada ................CSA Britain..................BASE/BS
Germany ..............VDE Japan...................Electric Appliance
Control Act
IMPORTANT NOTICE CONCERNING POWER CORD SELECTION
The power cord set for this unit has been enclosed and has been selected
according to the country of destination and must be used to prevent electric
shock. Use the following guidelines if it is necessary to replace the original
cord set, or if the cord set is not enclosed. The female receptacle of the cord
set must meet IEC-60320 requirements and will look like (Figure A1 below):
For the United States and Canada
In the United States and Canada the male plug is a NEMA5-15 style (Figure
A2), UL Listed, and CSA Labeled. For units which are mounted on a desk or
table, type SVT or SJT cord sets may be used. For units which sit on the floor,
only SJT type cord sets may be used. The cord set must be selected
according to the current rating for your unit. Please consult the table below for
the selection criteria for power cords used in the United States and Canada.
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Cord Type Size of Conductors in
Cord
Maximum Current Rating of
Unit
SJT 18 AWG
16 AWG
14 AWG
10 Amps
12 Amps
12 Amps
SVT 18 AWG
17 AWG 10 Amps 12 Amps
For European Countries
In Europe you must use a cord set which is appropriate for the receptacles in
your country. The cord set is HAR Certified, and a special mark that will
appear on the outer sheath, or on the insulation of one of the inner
conductors.
AC PLUG CORD PRECAUTIONS FOR THE UNITED KINGDOM
For your safety please read the following text carefully.
If the fitted moulded plug is unsuitable for the socket outlet then the plug
WARNING:
IMPORTANT: The wires in this mains lead are colored in accordance with the
following code: Green-and-Yellow: Earth
Blue: Neutral
Brown: Live
If the colored wires of the mains lead of this appliance do not correspond with
the colored markings identifying the terminals in your plug, proceed as
follows:
The wire which is colored GREEN-AND-YELLOW must be connected to the
terminal in the plug which is marked by the letter E or by the Earth symbol or
colored GREEN or GREEN-AND-YELLOW.
The wire which is colored BLUE must be connected to the terminal in the plug
which is marked with the letter N or colored BLACK. The wire which is colored
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should be cut off and safely disposed. There is a danger of serving, electronically
THIS APPLIANCE MUST BE CONNECTED TO EARTH GROUND.
shock, if the cut off plug is inserted into and appropriate socket.
If a new plug is to be fitted, please observe the wiring code as shown below. If
in any doubt, please consult a qualified electrician.

BROWN must be connected to the terminal in the plug which is marked
with the letter L or colored RED.
If you have any questions concerning which proper power cord to use, please
consult with the dealer from whom you have purchased the product.
PRECAUTION
For best viewing conditions sit at least 18" from the LCD Display.
AVOID TOUCHING THE SCREEN WITH YOUR FINGERS. Oils from
the skin are difficult to remove.
NEVER REMOVE THE REAR COVER. The LCD Display contains
high-voltage parts. You may suffer serious injury if you touch these parts.
Avoid exposing the LCD Display to direct sunlight or another heat source.
The ViewPanel should be facing away from direct sunlight to reduce glare.
Always handle your LCD Display with care when moving it.
Place your LCD Display in a well-ventilated area. Do not place anything
on the ViewPanel that prevents adequate dissipation of heat.
Ensure the area around the LCD Display is clean and free of moisture.
Do not place heavy objects on the LCD Display, video cable, or power
cord.
If smoke, abnormal noise, or strange odor is present, immediately
switch the LCD Display off and call your dealer or ViewSonic. It is dangerous
to continue using the LCD Display.
Chapter 1 PREFACE
The purpose of this manual provides integral information you need to
maintain the LCD Monitor. And this manual is applied to the mode of
1024 x 768 pixels color TFT LCD Monitor.
This manual is for the experienced electronic technicians and those with
similar backgrounds. Send the products back to the local distributor or
repair center. Do not attempt any disassembling actions that are
complex or aren’t mentioned in the troubleshooting chapter.
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The manual includes Engineering Specification,Front Panel
Control description, Circuit Description,Troubleshooting,Theory of
Operation,Mechanical Assembly,Service Parts List, and Circuit
Diagram. Each section will be briefly discussed below.
ENGINEERING SPECIFICATIONS
This CHAPTER provides the engineering specification for the
designated Display. Since we only provide a reference engineering specification
in this service manual, Please refer to ViewSonic£Engineering Product
Specification for detailed product specification.
FRONT PANEL CONTROL
This CHAPTER provides User Control Panel functions and descriptions.
Access to OSD (On Screen Display) setting, (eg. timing adjustment, default
setting, restoring to factory mode can be referenced in this CHAPTER.
CIRCUIT DESCRIPTIONS
The first part of this CHAPTER provides a functional block diagram
for the Display. The second part of this CHAPTER consists of a
detailed I/O connector PIN ASSIGNMENT for the PCBs.
TROUBLESHOOTING
Maintenance procedures described in this chapter are intended to
isolate faulty parts and replace them in the field. The chapter makes
explanations on how to detect errors, through a series of sequential flow
chart for fault detection and means of corrections. The material contained
in this chapter provides basic troubleshooting techniques on the module
level.
THEORY OF OPERATION
This chapter is written and designed for use on in-lab
troubleshooting. The chapter contains the detailed description on the
operations of parts, which are labeled on the Functional Block Diagram.
The chapter is intended for in-lab repair personnel who would conduct an
in-lab troubleshooting of the system.
MECHANICAL ASSEMBLY
This chapter contains an Exploded Drawing for the system, for which
can be used by the repair personnel for parts identity.
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This chapter aims to serve as a guide in procuring replacement parts for
this product.
CIRCUIT DIAGRAM
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SERVICE PARTS LIST
PCB LAYOUT
This CHAPTER provides functional circuits diagram of the LCD Display.
This CHAPTER provides PCB Layout of the LCD Display.

Chapter 2 SPECIFICATIONS
2.1 SCOPE
2.1.1 Introduction
Product Configuration This specification defines the configuration
and performance requirements for the
following monitors:
Worldwide product Product Name: VE150m / VE150mb
Model Number: VLCDS22574 - XYZ
Panel: CMO M150X3
** - 1st “*” is designated series from 0~9,
2nd “*” is designated for region A~Z, 3RD
“*” referred to color or new technology
2.1.2 Product Definition
Top Level Assembly
Notes:
a. All Power cables connect into Power
Supply.
b. All quantities are n=1 unless
otherwise specified.
c. All Items go into ‘All’ versions
(-M/-E/-P) unless otherwise
specified.
1. VE150m Product Assembly (Beige for
VE150m, Midnight Gray for VE150mb)
2. 1.8m US Power Cable
3. 1.8m Euro Power Cable, “Schuko”
4. 40 W DC Power Supply w/ 1.5m DC Cable lead
to Monitor.
5. Attached analog VGA Cable, 1.8 m w/Blue
connectors. DDC Compliant HPD (hot plug
detection).
6. Audio cable, 1.8 m with lime green (pantone
color# 577C) connector stereo mini
7. Quick Start guide / ViewSonic System wizard
CD-ROM. (No E-Color).
8. Warranty sticker
(For J model and G model)
9. Warranty card
(For J model and G model)
10. Carton sticker.
(G model only)
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Product Assembly 1. VE150m / VE150mb unit
2. Attached base and neck
2.2 GENERAL REQUIREMENTS
2.2.1 General Specifications
Test Resolution & Frequency 1024 x 768 @ 60Hz
Test Image Size Full Size
Contrast and Brightness Controls Factory Default – Contrast = 70% (center),
Brightness = 100%
2.3 SIGNAL INTERFACE
2.3.1 RGB Input Video Interface
Connector(s) 1 DB-15
Default Input Connector DB-15 Connector if both inputs are active.
If only one input is active, the display
should auto-select the active input.
Video Cable Color VE150m (Beige), VE150mb (Black)
Video Cable Strain Relief Twice the weight of the monitor or 18 kg for
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five minutes.
Video Cable Connector DB-15 Pinout Compliant with IBM 8513 and VESA DDC
1/2B.
Video Signals 700 mV full scale, 1,000 mV full scale
Video Impedance 75 Ohms
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
Sync Level 2.5 Volts – 5.25 Volts
DDC 1/2B Compliant with Revision 1.3, supports GTF
Sync Compatibility Separate Sync
Video Compatibility All PC type computers
Macintosh computers
After market video cards
Exclusions None
Table 1: 15 pin D-sub connector pin assignment
Pin Number
Pin Function
Red video input 1
Green video input 2
Blue video input 3
Ground 4
Ground 5
Red video ground 6
Green video ground 7
Blue video ground 8
+5V 9
Ground 10
No connection 11
(SDA) 12
Horizontal sync (Composite sync) 13
Vertical sync 14
(SCL) 15
2.4 Power
2.4.1 Power Supply
External Power Supply Primary: CHI, CH-1234X
(12V - 40W)
2nd Sources : HJC, HASU05F
(12V - 48W).
Input Voltage Range 90 to 264 VAC
Input Frequency Range 47.5 to 63 Hertz
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Output Voltage @0-3.58A Load 12V DC +/- 5%
Short Circuit Protection Output can be shorted without damage.
Over Current Protection 4.5A typical at 12VDC
Leakage Current 3.5mA (Max) at 254VAC / 60Hz
Efficiency 78% typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation – max 40W (CHI) / 48W (HJC)
Max Input AC Current 1.5Arms @90VAC, 0.75Arms @180VAC
Inrush Current (Cold Start) 40A@ 120VAC and 80A(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.
Power Supply Transient Immunity Shall be able to withstand an ANSI/IEEE
C62.41-1980 6000V 200 ampere ring
wave transient test with no damage.
Power Supply Line Surge Immunity Shall be able to withstand 1.5 times
nominal line voltage for one cycle 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 define to comply
with ISO 7779 (DIN EN27779:1991) Noise
measurements of machines acoustics.
Power Switch noise shall not be
considered.
2.4.2 Power Interface
AC input to DC Power Supply 3 Prong Socket Assembly,
DC Power Connector 2.5mm DIN DC Power Connector w/ 1.5m
VE150m (beige), VE150mb (black).
AC Power Cable Length 1.8 m (6 feet)
Power Cable Color VE150m (beige), VE150mb (black).
US Type Power Cable Separate 3-prong NEMA 5-15P type plug.
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Length = 1.8m. Connects to DC Adapter.
VE150m (beige), VE150mb (black).
European Type Power Cable Schuko CEE7-7. Length = 1.8m,
Connects to DC Adapter.
VE150m (beige), VE150mb (black).
2.4.3 Power Saving Operation
Method VESA DPMS Signaling
Power Consumption ON Mode < 30 W (max)
ACTIVE OFF < 2 W
Recovery Time ON Mode = N/A
OFF < 3 sec
2.5 FRONT PANEL CONTROLS AND INDICATORS
2.5.1 Front Panel Hardware Controls
Power Switch (Front Head) Power Control, soft Power Switch.
Power LED (Front Head) Green – ON
Orange – DPMS Active Off
Dark = Soft Power Switch OFF
Front Panel Controls (Head) Button 1
Down arrow button
Up arrow button
Button 2
Audio buttons: Mute, volume down and
up
Power
Short Cuts Function from the button(s) [DOWN] or [UP] arrow = to activate
contrast and brightness
[2] = Auto Tune (Auto Image Adjust)
[DOWN] and [UP] arrows = recall at
specific function or adjustment
OSD Lock short cuts function for the buttons
1. The OSD lock will be activated by pressing the front panel control buttons "(1), &
(up)" for 10 seconds. If the user then tries to access the OSD by pressing any of
the buttons "1", "down", "up", "2" a message will appear on the screen for 5
seconds showing "OSD Locked". The OSD lock will be deactivated by pressing
the front panel control buttons "(1), & (up)" again for 10 seconds.
Note: Status bar and the statement showing OSD Locking or OSD Unlocking
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is in progress and when it is completed then the final message will indicate
“OSD Locked or OSD Unlocked”.
2. The power button lock will be activated by pressing the front panel control buttons
"(1), & (down)" 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 5 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 its 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), & (down)" again for 10 seconds.
Note: Status bar and the statement showing Power Button Locking or Power
Button Unlocking is in progress and when it is completed then the final
message will indicate “Power Button Locked or Power Button Unlocked”
Control Type Digital with an OSD.
OSD Controls
OSD Functions - Contrast, Brightness, Auto Image Adjust, H/V Position, H. Size, Fine Tune,
Color Adjust (9300, 6500, Video Enhanced Mode 1, 2, 3, user adjustment), sharpness
(on/off), information, Language (English, French, Deutsch, Espanola, Italian, Suomi,
Japanese, Traditional Chinese, Simplified Chinese), OSD position, OSD time out, Resolution
Notified, Memory Recall.
Memory Recall is to recall the following functions to factory setting: Contrast, brightness,
auto tune (h/v size, h position), color temperature @ 6500K, OSD position, sharpness, and OSD timeout.
OSD Auto Save The OSD shall save new settings when it
is turned off by the user or when it is time
out. There shall not be a separate save.
2.6 ELECTRICAL REQUIREMENTS
2.6.1 Horizontal / Vertical
Frequency
Horizontal Frequency 30 – 60kHz
Vertical Refresh Rate 50 – 75 Hz.
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Maximum Pixel Clock 80 MHz
Sync Polarity Independent of sync polarity.
2.6.2 Primary Presets
Primary Preset VESA 1024 x 768 @ 75 Hz
2.6.3 Look up table timing
1. IND 640 x 350 @ 70Hz, 31.47kHz, -/+
2. IND 720 x 400 @ 70Hz, 31.467kHz, +/-
3. VESA 640 x 480 @ 60 Hz, 31.5 kHz
4. MAC 640 x 480 @67Hz, 35kHz
5. VESA 640 x 480 @72Hz, 37.861kHz, -/-
6. VESA 640 x 480 @75Hz, 37.5kHz, -/-
1. VESA 800 x 600 @56Hz, 35.156kHz, +/+
2. VESA 800 x 600 @60Hz, 37.879kHz, +/+
3. VESA 800 x 600 @72Hz, 48.077kHz, +/+
4. VESA 800 x 600 @75Hz, 46.875kHz, +/+
5. MAC 832 x 624 @75Hz, 49.725kHz
6. VESA 1024 x 768 @70Hz, 56.476kHz, -/-
7. VESA 1024 x 768 @72Hz, 58.036kHz, -/-
8. VESA 1024 x 768 @75Hz, 60.023kHz, +/+
2.6.4 User Presets
Number of User Presets (recognized
timings) Available
20 presets total.
2.6.5 Changing Modes
Maximum Mode Change Blank Time for
image stability. 3 seconds (Max), 1-2 seconds (Typ) for unrecognized timing.
2 seconds (Typ) for recognized timings
Mode Change Image The image shall blank while the monitor
changes modes.
2.6.6 GTF
GTF The system shall recognize GTF timings
which are allowable within horizontal/
vertical / dot rate / and resolution
specifications.
2.7 Audio
2.7.1 Speaker specification
Line input connection 3.5 mm stereo jack
Line input signal 1 Vrms
Line input impedance 10kOhm
Maximum Power Output (Electric) 1.5W @ < 5% distortion
Signal to Noise Ratio 72dB
Frequency Response 200 Hz – 20 KHz
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Distortion < 1 % THD @ 1kHz
Connector color PC99 requirement
Audio in Lime Green pantone # 577C
Cable length 1.8 m
2.8 LCD Panel
2.8.1 Panel Characteristics
Panel Type CMO M150X3
Type Active Matrix TFT, (TN technology)
Active Size 304.1mm (H) x 228.1 mm (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.297 mm
Glass Treatment Anti Glare (Hard coating 3H)
# of Backlights 4 CCFL edge-light (2 top/2 bottom)
Backlight Life 50,000 hours (typ) / 40,000 hours (min)
Interface TTL Method
2.8.2 Panel Performance
Luminance - Condition: 6500K and
Brightness @ Max
300 cd/m2 (typ) / 240 cd/m2 (min)
Brightness Uniformity 85% Adjacent Area
70% Entire Area
Contrast Ratio 300:1 (typ) / 250:1(min)
Color Depth 6 bits reproduce 262,144 colors
Viewing Angle (Horizontal) 120 deg (typ) / 100 deg (min) @ CR>=10
Viewing Angle (Vertical) 100 deg (typ) / 80 deg (min) @ CR>=10
Response 30ms(Tr+Tf) (typ.) / 60ms (max)
Pixel Defects For further detail, refer to Panel
Acceptance Specification.
Image Sticking
Using White Window Icon Image.
No visible image sticking longer than 5
seconds after the following:
24Hr full screen checkerboard pattern,
then switch to full white screen.
Mura Defect Not visible with visible inspection
Please see Panel Acceptance
Specification.
Photo Etch Lines Not visible with visible inspection
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Please see Panel Acceptance
Specification.
Other Panel Defects Please see Panel Acceptance
Specification.
Panel Defects Please see Panel Acceptance
Specification.
2.9 IMAGE PERFORMANCE
2.9.1 Factory Defaults
Preset Color 6500K (Primary 1)
Contrast Control Factory Default
Brightness Control Factory Default
2.9.2 Display Size
Horizontal Display Size, Primary Preset Full Screen
Vertical Display Size, Primary Preset Full Screen
2.9.3 Frame Refresh Rate
Frame Frequency Scan rate conversion shall be performed
to match input signal frame rates to VESA
1024 x 768 @ 75Hz
2.9.4 Preset Color Temperatures
Preset 1 9300K x= 0.283 +/- 0.025, y=0.298+/-0.025
Preset 2 6500K (Default) x= 0.310 +/- 0.025, y=0.330+/-0.025
Preset Color Temperature Adjustability Each color preset shall be adjustable.
Red, Green, and Blue shall be individually
controlled.
2.9.5 Video Cards Compatibility
Peaking Performance Peaking is not adjustable.
2.9.6 Raster Artifacts
Video Artifacts No Visible Streaking, Sag, or Smearing
Artifacts when driven by the specified
video cards in the primary mode and after
user adjustment to best condition.
Power Supply, and Grounding Artifacts No visible artifacts in any specified video
mode within the horizontal or vertical
frequency range of the monitor
Temperature Drift Image shall not drift or lose fine-tune
adjustment.
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Chapter 3 FRONT PANEL CONTROLS
3.1 Adjusting the Screen Image
Use the buttons on the front control panel to adjust the OnView®
controls which display on the screen.
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3.2 Do the following to adjust the screen image:
1. To display the Main Menu, press button [1]. From the Main Menu
you can also navigate to the other menus shown below:
NOTE: All OnView menus and adjustment screens disappear
automatically after about 15 seconds.
2. To select a control you want to adjust, press Ÿor źto scroll up or
down the Main Menu.
3. After the control is selected, press button [2].
4. To adjust the control, press the up Ÿor down źbuttons.
5. To save the adjustments and exit the menu, press button [1] twice.
The following tips may help you optimize your display:
zAdjust your computer's graphic card so that it outputs a video
signal 1024 x 768 @ 60Hz to the VE150m. (Look for
instructions on "changing the refresh rate" in your graphic
card's user guide.)
zSelect Image Adjust. (Button [2] on the LCD Display control.)
zIf necessary, make small adjustments using H POSITION and
V POSITION until the screen image is completely visible. (The
black border around the edge of the screen should barely touch
the illuminated "active area" of the LCD Display.)
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