ViewSonic VE175-3,VS 10231 Service manual

Service Manual

ViewSonic VE175-3-1

Model No. VS 10231

17” Color TFT LCD Display

ViewSonic

(VE175-3_SM_963 Rev. 1a Dec. 2004)



381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

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.

23/12/04

Revision History

Documents Number

DCN Number ECR Number

5003

Description of Changes EditorRevision SM Editing Date

Initial Release

A. Lu

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TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

5. Adjusting Procedure

6. Trouble Shooting Flow Chart

7. Recommended Spare Parts List

8. Exploded Diagram And Spare Parts List

9. Block Diagram

10. Schematic Diagrams

11. PCB Layout Diagrams

5 8

28 32

36 42 43

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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 high quality and safety approved AC/DC power cord. (5) Disconnect the power plug from AC outlet if the product is not 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 susceptible to excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- Place 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 inserting or disconnecting from input connector. (3) Wipe off water drop 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 insure human earth when handling. (7) Do not open nor modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module to any directions. (9) In case if a Module has to be put back into the packing container slot after once it was taken out from 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 nor tilt the Interface

Connector of the TFT Module.

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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist nor

bend the TFT Module even momentary. At designing the enclosure, it should be taken into consideration that

no bending/twisting forces are applied to the TFT Module from outside. Otherwise the TFT Module may be

damaged.

(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please follow local ordinances or

regulations for disposal.

(13) Small amount of materials having no flammability grade is used in the LCD module. The LCD module should

be supplied by power complied with requirements of Limited Power Source (IEC60950 or UL1950), or be

applied exemption.

(14) The LCD module is designed so that the CFL in it is supplied by Limited Current Circuit (IEC60950 or

UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

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Surface of the LCD panel is pressed by fingers and

Correct Methods:

Only touch the metal frame of the LCD panel or the front cover of the monitor.Do not touch the surface of the polarizer.

Incorrect Methods:

that will probably cause “Mura”.

Take out the monitor with cushions Taking out the monitor by grasping the LCD

panel.That will probably cause “Mura”.

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2. Specification

GENERAL specification

Test Resolution & Frequency 1280 x 1024 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A Video Cable Strain Relief Video Cable Connector DB-15 Pin out Compliant DDC 1/2B

Video Signals Video RGB (Analog) 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 Revision 1.3 Sync Compatibility Separate Sync

Video Compatibility

Resolution Compatibility Exclusions Not compatible with interlaced video

Factory Default: Contrast = 50%, Brightness = 100%

Equal to twice the weight of the monitor for five minutes

Shall be compatible with all PC type computers, Macintosh computers, and after market video cards 640 x 350, 640 x 480, 720 x 400 (640 x 400), 800 x 600, 832 x 624, 1024 x 768, 1280 x 1024

TABLE : 15 PIN D-SUB CONNECTOR PIN ASSIGNMENT

This section describes the pin assignment of the LCD’s video connector. It is called 15 Pin Mini D-sub Connector.

Pin NO. Signal Connector

1 Red Video Signal 2 Green Video Signal 3 Blue Video Signal 4 N.C. 5 Ground 6 Ground 7 Ground 8 Ground 9 +5v 10 Ground 11 N.C. 12 DDC data 13 Horizontal sync signal 14 Vertical sync signal 15 DDC clock

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Power Supply External Power Supply Part Number: HOAU222001 Input Voltage Range 90 to 264 VAC Over Current Protection 5 A TYPICAL AT 5 VDC Power Dissipation 45 Watts (typ)

Changing Modes

Maximum Mode Change Blank Time, for image stability. Note:

1) Excluding “Auto Adjust” time

2) Under DOS mode (640 x 350, 720 x 400 & 640

3 seconds (Max) 1 seconds (Typ) for recognized timings 1-2 seconds (Typ) for unrecognized timing .

x 400), there is no “Auto Adjust” feature.

3) The monitor needs to do “Auto Adjust” the first time a new mode is detected. Mode Change Image The image shall blank while the monitor changes

modes.

GTF

GTF N/A

Panel Characteristics Panel Type AUO M170EG01 V.1 Type COLOR ACTIVE MATRIX TFT, TN TYPE Active Size 337.92 (H) x 270.336 (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.264 mm Glass Treatment Anti Glare (Hard coating 2H) # of Backlights 4 CCFL edge-light (2 top / 2 bottom) Backlight Life 50,000 Hours (Typ) /30,000 Hours (Min)

Panel Performance

Luminance – Condition:

CT = 6500K, Contrast = Max, Brightness = Max

xxx cd/m2 (max after 30 minute warmup) 260 cd/m2 (typ after 30 minute warmup)

210 cd/m2 (min after 30 minute warmup) Brightness Uniformity 75% Entire Area (minimum) Contrast Ratio xxx:1 (max), 450:1 (typ), 250:1 (min) Color Depth 16.2 million colors (8 bit panel) Viewing Angle (Horizontal) 140 deg @ CR>10, Viewing Angle (Vertical) 130 deg @ CR>10, Response Time 10%-90% @ Ta=25°C

16 ms (Tr= 12 ms, Tf = 4 ms) (typ)

25ms (max) Panel Defects Please see Panel Quality Specifications.

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Horizontal/Vertical Frequency Horizontal Frequency 30-82 kHz Vertical Refresh Rate 50 – 75 Hz. Maximum Pixel Clock 140 MHz Sync Polarity Independent of sync polarity.

Primary Presets

Primary Preset 1280 x 1024 @ 60Hz

Look up table timing

<<Analog>>

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 400 @ 70Hz, 31.5kHz

3. 640 x 480 @ 60Hz, 31.5kHz

4. 640 x 480 @ 67Hz, 35.0kHz

5. 640 x 480 @ 75Hz, 37.5kHz

6. 640 x 480 @ 72Hz, 37.9kHz

7. 720 x 400 @ 70Hz, 31.5kHz

8. 800 x 600 @ 56Hz, 35.1kHz

9. 800 x 600 @ 60Hz, 37.9kHz

10. 800 x 600 @ 75Hz, 46.9kHz

11. 800 x 600 @ 72Hz, 48.1kHz

12. 832 x 624 @ 75Hz, 49.7kHz

13. 1024 x 768 @ 60Hz, 48.4kHz

14. 1024 x 768 @ 70Hz, 56.5kHz

15. 1024 x 768 @ 72Hz, 58.1kHz

16. 1024 x 768 @ 75Hz, 60.0kHz

17. 1280 x 1024 @ 60Hz, 63.4kHz

18. 1280 x 1024 @ 75Hz, 79.97kHz

User Presets

Number of User Presets (recognized timings) Available

10 presets total in FIFO configuration.

Environmental Conditions Operating Temperature 0°C to +40°C Storage Temperature -20°C to +60°C Operating Relative Humidity 20% to 90% RH Non-Condensing Storage Relative Humidity 5% to 90% RH Non-Condensing Operating Altitude 0 to +3,000 meters Storage Altitude 0 to +12,000 meters

Dimensions (Base attached unless otherwise specified) Width 414.5 mm Height 403 mm Depth 229 mm Monitor Weight 5.7 kg /12.57lbs

Ergonomics

Tilt Up 20 degrees minimum Tilt Down 5 degrees

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3. Front Panel Function Control Description

Adjusting the Screen Image

Use the buttons on the front control panel to display and adjust the OnView

controls which display on the screen. The OnView controls are explained at the top of the next page.

Main Menu with OnView controls

Displays, saves changes to, and exits the Main Menu.

Scroll through menu options and adjust the displayed control.

Front Control Panel

Power light

Power On/Off

Selects a highlighted control. Also, displays the control screen for the selected control and toggles between control pairs.

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Do the following to adjust the screen image:

To display the Main Menu, press button [1].

NOTE: All OnView menus and adjustment screens disappear automatically

after about 30 seconds. This time period is adjustable through the Setup menu and the OSD timeout control described on page 11.

To highlight a control you want to adjust, press I or J to scroll up or down the Main Menu.

To select the highlighted control, press button [2]. A control screen appears like the example shown below.

The line at the TheJdown arrow decreases,

up arrow

increases

To adjust the control, press the upIor downJbuttons.

To save the adjustments and exit the menu, press button [1] twice.

bottom of the screen

tells you what you

can do next - in this

example, either EXIT

or select the

BRIGHTNESS

control.

The following tips may help you optimize your display:

• Adjust your computer's graphic card so that it outputs a video signal 1280 x 1024 @ 60 Hz to the LCD dislay. (Look for instructions on “changing the refresh rate” in your graphic card's user guide.)

• If 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 dislay.)

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Main Menu Controls

Adjust the menu items shown below by using the up Iand down Jbuttons.

Control Explanation

Auto Adjust

automatically sizes, centers, and fine tunes the

video signal to eliminate waviness and distortion. Press the [2] button to obtain a sharper image.

NOTE

: Auto Adjust works with most common video cards. If

this function does not work on your LCD dislay, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.

Contrast

adjusts the difference between the image background

(black level) and the foreground (white level).

Brightness

Color Adjust

adjusts background black level of the screen image.

provides several color options: preset color temperatures and User which allows you to adjust red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

9300K

— Adds blue to the screen image for cooler white (used

in most office settings with fluorescent lighting).

6500K

— Adds red to the screen image for warmer white and

richer red. Default setting.

5400K — Adds green to the screen image for a darker color.

User

— Individual adjustments for red, green, and blue.

To select color (R, G or B) press button [2].

To adjust selected color, press I or J.

When you are finished making all color adjustments, press button [1] twice.

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Control Explanation

Information

coming from the graphics card in your computer. See your

displays the timing mode (video signal input)

graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

VESA 1280 x 1024 @ 60 Hz (recommended) means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust

The Manual Image Adjust controls are explained below:

H./V. Position

screen image. You can toggle between Horizontal and Vertical by pressing button [2]. Horizontal moves the screen image to the left or to the right. Vertical moves the screen image up and down.

adjusts horizontal and vertical position of the

H. Size

NOTE:

Fine Tune sharpens focus by aligning the illuminated text and/

(Horizontal Size) adjusts the width of the screen image.

Vertical size is automatic with your LCD dislay.

or graphic characters.

NOTE: Try the Auto Adjust (see page 9) before using the Fine

Tune control.

Sharpness

adjusts the clarity and focus of the screen image.

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Control

Explanation

Setup Menu displays the menu shown below.

The Setup Menu controls are explained below.

anguage

Select allows you to choose the language used in

the menus and control screens.

Resolution Notice

advises the optimal resolution to use. After selecting Resolution Notice, a sub menu appears asking if you want to Disable or Enable the notice. If you want the Resolution Notice to appear on-screen, select Enable.

OSD

OSD Position

allows you to move the on-screen display menus

and control screens.

OSD Timeout

sets the length of time an on-screen display screen is displayed. For example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears.

OSD Background

allows you to turn the On-Screen display background on or off. This means that while making adjustments from the OSD control screens you can also view open software applications, or the Windows desktop.

Memory Recall

returns adjustments to the original factory settings if the display is operating in a factory Preset Timing Mode listed in this user guide.

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Hot Key for Function Controls

connected) , then press

. After entering Burn in Mode. press

2] key at the same time and plug the

Buttons: Functions:

[Up] + [Down] arrows Recall Contrast or Brightness while in the

Contrast or Brightness adjustment.or recall both of Contrast and Brightness when the OSD in not on.

[1] + [2] Toggle 720x400 and 640x400 mode when input

720x400 or 640x400 mode.

[1] + [Up] + [Down] White Balance.White Balance should set the

screen on the pure black and white pattern with

640x480@60Hz

resolution.

[1] + [Down] (hold for 10 seconds) Power Lock (Unlock).User won’t be able to turn

off the monitor. [1] +[Up] (hold for 10 seconds) OSD Lock (Unlock). Then press [Up] key at the same time and plug the AC cord. un-plug the AC cord and be sure the signal cable not connected (D-sub not [2] key at the same time and plug the AC cord.

All Mode Reset. It will erase all end user’s setting

and restore the factory defaults.

Burn in Mode

[1] button. you can find the information about this

monitor.

un-plug the AC cord and be sure the signal cable then press [ AC cord.

Factory in Mode.

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4. Circuit Description

1. WORKING THEOREM

A. DC-DC CONVERTER

This brick converts the 5V input voltage to 3.3V and 1.8V for controller use. It consists of a Liner Regulator IC (AIC117), filter capacitor, and constant voltage capacitor. The AIC1117 is a low dropout three terminal regulator with 800mA output current capability. Its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Internal current and thermal limiting provides protection against any overload condition that would create excessive junction temperatures.

B. A/D converter

The gmZAN3SL provides all the key display functions required for displaying a good quality image on a LCD

panel when connected to the PC source with analog interface. The integrated functions include a high-speed triple-ADC and PLL, a high quality zoom and shrink scaling engine, an on-screen display (OSD) controller, digital color controls and LVDS Transmitters. Its provides a front-end analog interface with standard VGA compliance and an output industry standard LVDS interface for speed grade up to XGA and SXGA respectively. Typical gmZAN3SL based design need an external 8051 equivalent MCU with integrated flash. It provides the flexibility of choosing either 8bit parallel or 6wire host interface. Integrated LVDS transmitters and PWM based backlight control circuitry provides direct interconnect to LCD panels and backlight inverters. Integrated Schmitt circuit, integrated reset circuit and single crystal base makes gmZAN3XL/SL an ideal choice for the entry- level SXGA monitor design.

D. MCU:

The MTV312M micro-controller is an 8051 CPU core embedded device especially tailored for CRT/LCD Monitor applications. It includes an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface, 4- channel A/D converter, and a 64K-byte internal program Flash-ROM.

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ViewSonic VE175-3,VS 10231 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual