Viewsonic VG500-2 User Manual

Service Manual

ViewSonic VG500-2

Model No. VLCDS24349-2W

15 Color TFT LCD Display”

VG500-2_SM_679-Rev. 1a - Oct. 2003

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

Copyright 2003 belongs to Viewsonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, 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 Date Description of Changes Approval

1a Oct,23 '03 Initial Release DCN-3744 Bonnie Ting

ViewSonic Corporation i Confidential - Do Not Copy VG500-2

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

ViewSonic Corporation ii Confidential - Do Not Copy VG500-2

1. Precautions and Safety Notices

1.1. SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user's safety comes first. However,

improper use or installation may cause damage to the monitor as well as to the user. Carefully go over the

following WARNINGS before installing and keep this guide handy.

WARNINGS:

♦ This monitor should be operated only at the correct power sources indicated on the label on the rear

end of the monitor. If you're unsure of the power supply in your residence, consult your local dealer or

power company.

♦ Use only the special power adapter that comes with this monitor for power input.

♦ Do not try to repair the monitor your self as it contains no user-serviceable parts. This monitor should

only be repaired by a qualified technician.

♦ Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock to

human bodies, even when the power cord is unplugged.

♦ Stop using the monitor if the cabinet is damaged. Have it checked by a service technacian.

♦ Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable immediately

and consult your service technician.

♦ Always unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply

non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

♦ Keep the monitor away from magnetic objects, motors, TV sets, and transformer.

♦ Do not place heavy objects on the monitor or power cord.

1.2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection

afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages,

wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use

of substitute replacement parts which do not have the same safety characteristics as specified in the parts list

may create shock, fire, or other hazards.

1.3. SERVICE NOTES

1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

2. When replacing a high wattage resistor (more than 1W of metal oxide film resistor) in circuit board, keep

the resistor about 5mm away from circuit board.

3. Keep wires away from high voltage, high temperature components and sharp edges.

4. Keep wires in their original position so as to reduce interference.

5. Usage of this product please refer to also user's manual.

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

2. Specification

2.1 PRODUCT SPECIFICATIONS

LCD Panel 15.0” TFT

Power Management Energy Star compliant VESA

DPMS compatible <2W

Displayable Resolution XGA, 1024x768 (max.)

Pixel Dimension0.297(H) x 0.297(V) mm

LCD Display Color 16.7M color (max.)

Viewing Angle CR>

Horizontal: -60˚~+60˚ Vertical: -55˚~+45˚

Tilt -5˚~20˚

400:1 typical

Contrast Ratio Brightness

250:1 minimum 200cd/m² (min) 250cd/m² (typ.)

Response Time Tr: 7ms, Tf: 23ms

Active Display Area 304.1mm(H) x 228.1mm(V)

Temperature Operating: 0˚C~+40˚C (240h)

Storage: -20˚C~+60˚C (240h)

Compliance UL, CSA, FCC, CE, CB, BSMI, Energy Star, TUV,

Semko, Nemko, Femko, Demko, DHHS, MPRII,

TCO99, GOST-R, C-Tick, VCCI, CCC

Power Input Voltage: 100~240 Vac

Consumption: 30Watts (Max.)

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

2.2. SUPPORTING MODES

Primary Preset: VESA 1024 x 768 @ 60Hz

Factory Preset Modes:

2. VESA 640x480 @ 60Hz, 25.175MHz

3. MAC 640x480 @ 67Hz, 31.500MHz

4. VESA 640x480 @ 72Hz, 31.50MHz

5. VESA 640x480 @ 75Hz, 31.50MHz

6. VESA 720x400 @ 70Hz, 28.320MHz

7. VESA 800x600 @ 56Hz, 36.00MHz

8. VESA 800x600 @ 60Hz, 40.00MHz

9. VESA 800x600 @ 72Hz, 50.00MHz

10. VESA 800x600 @ 75Hz, 49.5MHz

11. MAC 832x624 @ 75Hz, 57.272MHz

12. VESA 1024x768 @ 60Hz, 65MHz

13. VESA 1024x768 @ 70Hz, 75.000MHz

14. VESA 1024x768 @ 72Hz, 78.000MHz

15. MAC 1024x768 @ 75Hz, 80.000MHz

16. VESA 1024x768 @ 75Hz, 78.750MHz

2.3. D-SUB CONNECTOR PINASSIGNMENT

1. VGA 640x350 @ 70Hz, 25.176MHz

Pin No. Symbol Signal Description

1 R RED 0.7vp-p (VIDEO)

2 G GREEN 0.7vp-p (VIDEO)

3 B BLUE 0.7vp-p (VIDEO)

4 GND GROUND

5 GND GROUND

6 GND GROUND

7 GND GROUND

8 GND GROUND

9 VCC_+5V PC +5V

10 GND GROUND

11 N.C.

12 DDC_SDA DDC1/2B TTL

13 DDC_SCL DDC1/2B TTL

14 VGA_VSYNC VSYNC TTL positive or negative

15 VGA_HSYNC HSYNC TTL positive or negative

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

2.4 Main DC+12V Input (J800 on I/F Board)

Pin No. Symbol Function

1 GND Ground

2 DC+12V Main DC+12V Input

3 GND Ground

2.5 Audio Input Jack (J701 on I/F Board)

Pin No. Symbol Function

1 Ground

2 L_CH_Audio Input

3 R_CH_Audio Input

4 L_CH_Audio Return

5 R_CH_Audio Return

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

2.6 Internal Connector & Pin Assignment

XGA Interface Board (PWB-0535)

CON1 : Connect with Control board

Pin No. Symbol Function

1 Mute

OSD, Audio Mute Function Button

2 SP- Adjust audio volume smaller

3 SP+ Adjust audio volume louder

4 Menu Call out or close the OSD menu or come back to the

previous menu

5 Down Choose the next one item or value

6 Up Choose the last one item or value

7 Sel Select

8 GND Ground

9 Amber Indicate the system in power saving mode

10 Green Indicate the system in active mode

11 GND Ground

12 Power Power on/off control port

CON3 : Connect to the PWB-0537, which is power/audio board

Pin No. Symbol Function

1 SENSOR Detect audio I/P signal

2 GND Ground

3 +12V DC+12V

4 GND Ground

5 CCFL_EN Backlight lamps ON(high)/Off(Low) control

6 GPIO2/PWM2 Brightness adjustments (Low Max./ Hi. Min.)

7 MUTE+ Audio Must control (High means SPK off, Low means On)

8 GND Ground

9 +5V DC+5V

10 +5V DC+5V

11 STDBY Audio Stand-by control (Hi means stand-by, Low means Normal)

12 VOLUME Speaker volume control (0V means Sound off, 1.2V means MAX.)

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

CON5 : Output to panel

Pin No. Symbol Function

1 GND Ground

2 GND Ground

3 CLKH- Sampling Clock for line pixels

4 GND Ground

5 GND Ground

6 OB7 Blue data signal of odd pixel

7 OB6 Blue data signal of odd pixel

8 OB5 Blue data signal of odd pixel

9 OB4 Blue data signal of odd pixel

10 OB3 Blue data signal of odd pixel

11 OB2 Blue data signal of odd pixel

12 OB1 Blue data signal of odd pixel

13 OB0 Blue data signal of odd pixel

14 GND Ground

15 OG7 Green data signal of odd pixel

16 OG6 Green data signal of odd pixel

17 OG5 Green data signal of odd pixel

18 OG4 Green data signal of odd pixel

19 OG3 Green data signal of odd pixel

20 OG2 Green data signal of odd pixel

21 OG1 Green data signal of odd pixel

22 OG0 Green data signal of odd pixel

23 GND Grounding

24 OR7 Red data signal of odd pixel

25 OR6 Red data signal of odd pixel

26 OR5 Red data signal of odd pixel

27 OR4 Red data signal of odd pixel

28 OR3 Red data signal of odd pixel

29 OR2 Red data signal of odd pixel

30 OR1 Red data signal of odd pixel

31 OR0 Red data signal of odd pixel

32 GND Ground

33 GND Ground

34 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

35 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

36 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

37 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

38 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

Pin No. Symbol Function

39 VDDA DC+9V for panel D/A reference voltage to make gray scale smooth

40 GND Ground

41 GND Ground

42 GND Ground

43 GND Ground

44 EPOL O/E reference voltage selection

45 HMS2_E Even pixel inverter for power saving and reducing EMI

46 HMS1_O Odd pixel inverter for power saving and reducing EMI

47 DHS_LP Latch pulse for per line

48 STH1 Trigger the first pixel per line

49 GND Ground

50 GND Ground

CON6 : Output to panel

Pin No. Symbol Function

1 GND Ground

2 GND Ground

3 VEEG DC-6V for frame dark

4 VEEG DC-6V for frame dark

5 VDDG DC+18V for frame white

6 VDDG DC+18V for frame white

7 CLKV Sampling Clock for frame line

8 STV1 Trigger the first line per frame

9 VDDD DC_3.3V for panel VCC

10 VDDD DC_3.3V for panel VCC

11 VDDD DC_3.3V for panel VCC

12 VDDD DC_3.3V for panel VCC

13 VDDD DC_3.3V for panel VCC

14 VDDD DC_3.3V for panel VCC

15 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

16 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

17 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

18 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

19 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

20 VCOM Panel flicker adjustment, Adjustable voltage from DC3.3V ~4V

21 GND Ground

22 GND Ground

23 EB7 Blue data signal of even pixel

24 EB6 Blue data signal of even pixel

25 EB5 Blue data signal of even pixel

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

26 EB4 Blue data signal of even pixel

Pin No. Symbol Function

27 EB3 Blue data signal of even pixel

28 EB2 Blue data signal of even pixel

29 EB1 Blue data signal of even pixel

30 EB0 Blue data signal of even pixel

31 GND Ground

32 EG7 Green data signal of even pixel

33 EG6 Green data signal of even pixel

34 EG5 Green data signal of even pixel

35 EG4 Green data signal of even pixel

36 EG3 Green data signal of even pixel

37 EG2 Green data signal of even pixel

38 EG1 Green data signal of even pixel

39 EG0 Green data signal of even pixel

40 GND Ground

41 ER7 Red data signal of even pixel

42 ER6 Red data signal of even pixel

43 ER5 Red data signal of even pixel

44 ER4 Red data signal of even pixel

45 ER3 Red data signal of even pixel

46 ER2 Red data signal of even pixel

47 ER1 Red data signal of even pixel

48 ER0 Red data signal of even pixel

49 GND Ground

50 GND Ground

POWER/AUDIO Board (PWB-0537)

JP2 : Connect to the I/F Board

Pin No. Symbol Function

1 Volume Speaker volume control (0V sound off, 1.2V sound Max.)

2 Stdby Audio standby control (High standby, Low normal)

3 DC+5V DC+5V

4 DC+5V DC+5V

5 GND Ground

6 MUTE+ Audio mute control (Voltage High speaker off, Low speaker on)

7 BRT Brightness adjustment (Low is max., High is Min.)

8 CCFL_EN Backlight lamps enable (ON/high, OFF/low)

9 GND Ground

10 DC+12V DC+12V

11 GND Ground

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

12 SENSOR Detect audio I/P signal

P1 : Connect to inverter

Pin No. Symbol Function

1 DC+12V DC+12V

2 GND Ground

3 BRT Brightness adjustment (Low is Max., High is Min.)

4 DC+5V DC+5V

5 CCFL_EN Backlight lamps enable (ON/high, OFF/low)

CN701 : Connect to control board, control the audio

Pin No. Symbol Function

1 L- L_CH_SP_-Signal

2 L+ L_CH_SP_+Signal

3 GND_S1 Ground

4 R+ R_CH_SP_-Signal

5 R- R_CH_SP_+Signal

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

3. Front Panel Function Control Description

Use the buttons on the front control panel to display and adjust the OSD controls which display on the screen. The OSD controls are explained at the top of the next page and are defined in “Main Menu Controls” on page 9.

Main Menu With OSD controls

Front Control Panel shown below in detail

Speaker

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

Decreases or increases volume.

Temporarily silences audio output.

Speaker

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 Auto Image Adjust.

Power light Green = ON Orange = Power

Saving

ViewSonic Corporation

Confidential – Do Not Copy

Power On/Off

VG500-2

Do the following to adjust the screen image:

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

The line at the bottom of the screen tells you what you can do next: Exit this menu or Select the control that is highlighted.

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

To select the highlighted control, press button [2]. A control screen appears.

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

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

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.)

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

Main Menu Controls

Adjust the menu items shown below by using the up ▲ and down ▼ buttons.

Control Explanation

Auto Image 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 Image Adjust works with most common video cards. If this function does not work on your LCD display, 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

Audio Menu

Vol um e

adjusts background black level of the screen image.

controls are explained below:

increases the volume, decreases the volume, and mutes

the audio.

Mute

temporarily silences audio output.

Color Adjust

provides several color options: preset color temperatures and Custom User Color 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.

Custom User 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.

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

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 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:Trythe

Fine Tune

Sharpness adjusts the clarity and focus of the screen image.

Setup Menu controls are explained below:

Language allows you to choose the language used in the menus

Auto Image Adjust

control.

(see page 12) before using the

and control screens.

Resolution Notice

displays the recommended resolution for this

LCD display.

Enable allows the Resolution Notice to appear on-screen.

Disable will not allow the Resolution Notice to appear onscreen.

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

Control Explanation

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.

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 Custom User Color control.

ViewSonic Corporation

Confidential – Do Not Copy

VG500-2

+ 39 hidden pages

Viewsonic VG500-2 User Manual

Revision History

TABLE OF CONTENTS

1. Precautions and Safety Notices

2. Specification

3. Front Panel Function Control Description