Viewsonic VG510sb Service Manual 1b

Service Manual

ViewSonic VG510s/b-1

Model No. VLCDS27955-1W/-2W

15” Color TFT LCD Display

ViewSonic

(VG510s/b_SM_722 Rev. 1b Feb. 2005)



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.

04/14/04

02/18/05

Revision History

Documents Number

DCN Number ECR Number

3611

5100

4743 4975

Description of Changes EditorRevision SM Editing Date

Initial Release

4743 ECR Panel change to AUO 16ms P/N: VVLM150XN07 4975 ECR Panel change from AUO 16ms P/N: VVLM150XN07

to Sharp 16ms P/N: VVLLQ150X1LGN2C

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. Adjustment Procedure

6. Troubleshooting 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 9

26 29

40 46 48

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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 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.

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(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

or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit.

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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:

If the surface of the LCD panel is pressed by fingers, that may cause "MURA."

Take out the monitor by grasping the cushions.

If the monitor is removed by grasping the LCD panel, that may cause "MURA."

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Place the monitor on a clean and soft foam pad.

If the monitor is placed on foreign objects, that could scratch the surface of the panel or cause "MURA."

If the panel is placed facedown on the

lap, that may cause "MURA."

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2. Specification

Table : 15 pin D-sub connector pin assignment

Pin Number Pin Function

1 Red video input 2 Green video input 3 Blue video input 4 No Connection 5 Ground 6 Red video ground 7 Green video ground 8 Blue video ground

9 +5V 10 Ground 11 No connection 12 (SDA) 13 Horizontal sync (Composite sync) 14 Vertical sync 15 (SCL)

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes 2 640 x 400 @ 60Hz, 31.5kHz Yes Yes

3 640 x 400 @ 70Hz, 31.5kHz Yes Yes 4 640 x 480 @ 50Hz, 24.7kHz Yes Yes

5 640 x 480 @ 60Hz, 31.5kHz Yes Yes 6 640 x 480 @ 67Hz, 35.0kHz Yes Yes 7 640 x 480 @ 72Hz, 37.9kHz Yes Yes

8 640 x 480 @ 75Hz, 37.5kHz Yes Yes 9 720 x 400 @ 70Hz, 31.5kHz Yes Yes

10 800 x 600 @ 56Hz, 35.1kHz Yes Yes 11 800 x 600 @ 60Hz, 37.9kHz Yes Yes

12 800 x 600 @ 75Hz, 46.9kHz Yes Yes 13 800 x 600 @ 72Hz, 48.1kHz Yes Yes

14 800 x 600 @ 85Hz, 53.7kHz Yes Yes 15 832 x 624 @ 75Hz, 49.7kHz Yes Yes

16 1024 x 768 @ 60Hz, 48.4kHz Yes Yes 17 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

18 1024 x 768 @ 72Hz, 58.1kHz Yes Yes 19 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

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SPEAKER SPECIFICATION

LINE INPUT CONNECTION 3.5 MM STEREO JACK LINE INPUT SIGNAL 1.0 VRMS LINE INPUT IMPEDANCE 10 KOHM MAXIMUM POWER OUTPUT (ELECTRIC) SIGNAL TO NOISE RATIO 50 DB FREQUENCY RESPONSE 380 HZ – 20 KHZ DISTORTION < 1 % THD (@1KHZ)

VIBRATION THERE SHOULD BE NO AUDIBLE VIBRATION WITH VOLUME

SCREEN IMAGE THERE SHOULD BE NO AFFECT ON THE SCREEN IMAGE

CONNECTOR PC99 REQUIREMENT AUDIO IN CABLE TYPE / LENGTH 3.5MM STEREO CABLE / 1.8M LENGTH AUDIO DPMS SPEAKERS AND MICROPHONE STAY ON WHEN THE

Panel Characteristics

Model number SHARP LQ150X1LGN2C Type TN TYPE WITH LVDS INTERFACE Active Size 304.1 (H) X 228.1 (V) Pixel Arrangement RGB VERTICAL STRIPE Pixel Pitch 0.297 MM Glass Treatment ANTI GLARE (HARD COATING 2H) # of Backlights 2 CCFL EDGE-LIGHT (1 TOP / 1 BOTTOM) Backlight Life 50,000 HOURS (MIN) Luminance (Center)– Condition:

CT = 6500K, Contrast = Max, Brightness =

Max

2 W @ < 5% DISTORTION

AT 100% AND TREBLE / BASS AT DEFAULT.

STABILITY UNDER ANY CONDITIONS. LIME GREEN PANTONE # 577C

REST OF THE MONITOR IS IN POWER SAVING MODE.

260 CD/M2 (TYP AFTER 30 MINUTE WARM UP) 200 CD/M2 (MIN AFTER 30 MINUTE WARM UP)

Brightness Uniformity ≧80% ENTIRE AREA Contrast Ratio 350:1 (TYP), 250:1 (MIN) Color Depth 16 MILLION COLORS (8 BIT PANEL) Viewing Angle (Horizontal) @ CR>10 TYPICAL: 120º (±60º) MINIMUM: 100º (±50º)

@ CR>5 TYPICAL: 160º (±80º) MINIMUM: 140º (±70º)

Viewing Angle (Vertical) @ CR>10 Typical: 100º (U:45º / D:55º) Minimum: 75º (U:30º /

D:45º)

@ CR>5 Typical: 135º (U:55º / D:80º) Minimum: 110º (U:40º /

D:70º)

Response Time 10%-90% @ Ta=25°C

Mercury

16 ms (Tr= 13 ms, Tf = 3 ms) (typ) 25 ms (Tr= 20 ms, Tf = 5 ms) (max)

3.5 mg (Max) per lamp

Panel Defects Please see Panel Quality Specifications.

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Source Panel

Model Number AUO M150XN07 V.1 Type TN TYPE WITH LVDS INTERFACE Active Size 304.1 (H) X 228.1 (V) Pixel Arrangement RGB VERTICAL STRIPE Pixel Pitch 0.297 MM Glass Treatment ANTI GLARE (HARD COATING 3H) # of Backlights 2 CCFL EDGE-LIGHT (1 TOP / 1 BOTTOM) Backlight Life 30,000 HOURS (MIN) Luminance –

Condition:

250 CD/M2 (TYP AFTER 30 MINUTE WARM UP) 200 CD/M2 (MIN AFTER 30 MINUTE WARM UP)

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

Brightness Uniformity 80%(TYP) / 75%(MIN) ENTIRE AREA Contrast Ratio 400:1 (TYP), 300:1 (MIN) Color Depth 16 MILLION COLORS (6+2 BIT PANEL) Viewing Angle (Horizontal) @ CR>10

TYPICAL: 120º (±60º) MINIMUM: 100º (±50º) @ CR>5 TYPICAL: 150º (±75º) MINIMUM: 120º (±60º)

Viewing Angle (Vertical) @ CR>10

Typical: 100º (U:40º / D:60º) Minimum: 80º (U:30º / D:50º) @ CR>5 Typical: 125º (U:50º / D:75º) Minimum: 110º (U:45º / D:65º)

Response Time 10%-90% @ Ta=25°C

Mercury

16 ms (Tr= 4 ms, Tf = 12 ms) (typ) 23 ms (Tr= 6 ms, Tf = 17 ms) (max)

3.5 mg (Max) per lamp

Panel Defects Please see Panel Quality Specifications.

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IMAGE PERFORMANCE

Item Defaults Item Defaults Contrast 75% OSD H. Position 50% Brightness 100% OSD V. Position 50% Color Temperature 6500K OSD Time Out 15 Sec Sharpness 25% OSD Background On Volume 50% Resolution Notice Enabled

720x400/640x400 720x400

Dimension

Width 346 mm (13.6 inch) Height 355 mm (14.0 inch) Depth 156 mm (6.1 inch) Monitor Weight (w/o 250g AC adapter) 3.4 kg / 7.5 lbs

Dimension (Head Only / Wall Mount)

Width 346 mm (13.6 inch) Height 305 mm (12.0 inch) Depth 43 mm (1.7 inch) Monitor Weight 2.7 kg / 6.0 lbs

Ergonomics

Tilt Up From 0º up to ≧20º Tilt Down From 0º down to -3º ~ -5 º

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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

Front Control Panel shown below

Speaker Speaker

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

Displays the Main Menu or exits the control screen and saves adjustments

Decreases or increases volume

Audio Mute button turns the sound off.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle between analog and digital connections.

Power light Green = ON Orange = Power

Saving

Power On/Off

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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 select a control to be adjusted, press ▲ or ▼ to scroll up or down in the Main Menu.

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

The line at the bottom

The arrow decreases,

▲

increases.

To adjust the control, press the up ▲ or down ▼ buttons.

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

down

▼

up arrow

of the screen shows the current functions of buttons 1 and 2: 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 1024 x 768 @ 60 Hz to the LCD display. (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 display.)

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Main Menu Controls

Adjust the menu items shown below by using the up

Control Explanation

Auto Image Adjust

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

NOTE

: Auto Image Adjust works with most common video

cards. If this function does not work on your LCD display 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

Input Select toggles between analog and digital input signals.

adjusts background black level of the screen image.

automatically sizes, centers, and fine tunes

and down

buttons.

, then

Color Adjust

provides several color options: preset color

temperatures and RGB which allows adjustment of 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

User Color

1 2 3

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

— Individual adjustments for red, green, and blue.

To select color (R, G or B) press button [2]. To adjust selected color, press ▲ or ▼. When you are finished making all color adjustments, press

button [1] twice.

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Control Explanation

Information

displays the timing mode (video signal input) coming from the graphics card in your computer. See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

VESA 1024 x 768 @ 60 Hz (recommended) means that the resolution is 1024 x 768 and the refresh rate is 60 Hertz.

Manual Image Adjust

The Manual Image Adjust controls are explained below:

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

NOTE: Vertical size is automatic with your LCD display.

H./V. Position adjusts horizontal and vertical position of the

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.

Fine Tune

sharpens focus by aligning the illuminated text and/

or graphic characters.

NOTE: Try the

Fine Tune

Sharpness

control.

adjusts the clarity and focus of the screen image.

Auto Image Adjust

(see page 9) before using the

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Control Explanation

Setup Menu

displays the menu shown below:

The Setup Menu controls are explained below:

Language 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 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.

Exception: This control does not effect changes made with the User Color control.

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Hot Keys for Feature Controls

Buttons: Functions:

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

Contrast or Brightness adjustment screen, or reset both Contrast and Brightness when the OSD is not active.

[Volume-] + [Volume+] Reset volume to 50% while in the volume

adjustment screen, or when the OSD is not active.

[1] + [2] Toggle between 720x400 and 640x400 display

modes when the input signal is 720x400 or 640x400.

[1] + [Up] + [Down] Automatically adjust the White Balance to suit the

current video signal. To obtain the best adjustment, the input signal should be set to a pure black and

white pattern at 640x480 resolution and 60 Hz

refresh rate.

[1] + [Down] (hold for 10 seconds) Power Lock (Unlock). When Power Lock is

enabled, the monitor cannot be turned off.

[1] + [Up] (hold for 10 seconds) OSD Lock (Unlock). When OSD Lock is enabled,

all settings are fixed (including "Volume" and

"Mute").

[Up] + [Power On] with signal (hold for 3 seconds) [2] + [Power On] without signal (hold for 3 seconds)

All Mode Reset. Erase all user settings and restore the factory defaults. Burn In Mode. After entering Burn In Mode, press the [1] button to display monitor information.

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4. Circuit Description

A. DC-DC CONVERTER

This block converts the 12V input voltage to 5V for panel use and 3.3V for controller use.

It consists of a PWM IC (AP1501), flywheel Diode (D1), buck choke (L2), and capacitor (C70,71).

The AP1501 is a PWM generator working at 150Khz.

Self protection features include a two-stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.

B. A/D converter

The MST9111 is a highly integrated TFT LCD controller chip with the latest MST advanced image processing technology and an integrated ADC/PLL. The MST9111 has an advanced programmable non-linear parametric cubic based scaling engine with proprietary sharpness adjustment and text enhancement. The MST9111 supports both analog and digital interfaced inputs with an internal ADC/PLL. The MST9111 robustly handles a wide variety of TFT LCD panels and provides strong support of standard or non-standard input timings.

. Integrated high speed triple 8-bit ADC/PLL support up to 85MHz for XGA-75Hz

. Advanced image processing with proprietary non-linear parametric cubic based scaling engine

. Supports dual interface with an integrated ADC/PLL

. Robust auto configuration for input mode detection and

clock frequency and phase recovery for standard or nonstandard input timing

. Supports video processing with on-chip 2D de-interlacing and color space conversion . Supports programmable Gamma Correction

. GPIO pins for flexible system design

D. MCU:

The MTV512 micro-controller is an 8051 CPU core embedded device specially tailored to LCD monitor

applications. It includes an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface, 4 channel 6-bit A/D converter, a 64 K-byte internal program Flash-ROM.

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5. Adjustment Procedure

5-1 Product:

15” LCD Monitor

5-2 Test Equipment: 5-3 Test Condition

Before function test and alignment, each LCD Monitor should be run-in and warmed up for at least 30 minutes under the following conditions: (a) At room temperature, (b) With full white screen, RGB, and black (c) With cycled display modes, 640x480 (H=43.27 kHz, V=85Hz) 800x600 (H=53.7 kHz, V=85Hz) 1024x768 (H=68.67 kHz, V=85Hz)

5-4 Test Display Modes & Pattern

5-4-1 Compatible Modes

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 480 @ 60Hz, 31.5kHz

3. 640 x 480 @ 67Hz, 35.0kHz

4. 640 x 480 @ 75Hz, 37.5kHz

5. 640 x 480 @ 72Hz, 37.9kHz

6. 640 x 480 @ 85Hz, 43.27kHz

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. 800 x 600 @ 85Hz, 53.7kHz

13. 832 x 624 @ 75Hz, 49.7kHz

14. 1024 x 768 @ 60Hz, 48.4kHz

15. 1024 x 768 @ 70Hz, 56.5kHz

16. 1024 x 768 @ 72Hz, 58.1kHz

17. 1024 x 768 @ 75Hz, 60.0kHz

18. 1024 x 768 @ 85Hz, 68.67kHz

5-4-2 Auto Image Adjust

Please select and activate the "Auto Image Adjust" function on the Main Menu to verify that it functions properly. The "Auto Image Adjust" function is intended to provide satisfactory image quality by means of the built-in ASIC. For optimum image quality, the user must adjust each setting manually.

5-4-3 Firmware

Test Pattern: Burn in Mode (Refer to Chapter III-3. Hot Keys for Feature Controls)

- Verify that the firmware version is the latest.

5-4-4 DDC

Test Pattern: EDID program

- Verify that the test program passes.

5-4-5 Fine Tune and Sharpness

Test Signal: 1024 x 768 @ 60.0kHz Test Pattern: Line Moiré Pattern

- Verify whether the focus performs well, or whether the image has pixel-related noise. Eliminate the visible bars.

- If necessary, adjust with the following steps: (a) Select and activate the "Fine Tune" function on the "Manual Image Adjust" menu to eliminate the visible bars.

(b) Select and enter the "Sharpness" function to adjust the clarity and focus of the screen image.

Color Video Signal & Pattern (or PC with SXGA resolution)

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