ViewSonic VA503b-2, VA503m-2, VS11357 Service manual

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Service Manual

ViewSonic VA503b-2

VA503m-2

Model No. VS11357

15” Color TFT LCD Display

(VA503b-2_VA503m-2_SM Rev. 1a Aug. 2006)

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

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Copyright © 2006 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

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 8/21/2006 Initial Release Jamie. Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 9

4. Circuit Description 15

5. Adjustment Procedure 24

6. Troubleshooting Flow Chart 38

7. Recommended Spare Parts List 46

8. Exploded Diagram and Exploded Parts List 49

9. Block Diagram 54

10. Schematic Diagrams 55

11. PCB Layout Diagrams 62

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1. Precautions and Safety Notices

1. SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper used or installation may cause damage to the monitor as well as to the user.

WARNINGS:

z This monitor should be operated only at the correct power sources indicated on the label on the rear of the monitor. If

you’re unsure of the power supply in you residence, consult your local dealer or Power Company.

z Use only the special power adapter that comes with this monitor for power input. z Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. Only the qualified technician can

repair it.

z Do not remove the monitor cabinet. There are high-voltage parts inside that may cause electric shock to human

bodies.

z Stop using the monitor if the cabinet is damaged. Have it checked by a service technician. z Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable immediately and consult

your closed dealer.

z 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.

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

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 voltage, 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.

3. SERVICE NOTES

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

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

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

z Adjustment of this product please refers to the user’ manual.

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4. Handling and Placing Methods

Correct Methods: Incorrect Methods:

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

Surface of the LCD panel is pressed by fingers and that may cause "Mura".

Take out the monitor with cushions.

Taking out the monitor by grasping the LCD panel. That may cause "Mura".

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Correct Methods: Incorrect Methods:

Place the monitor on a clean and soft foam pad.

Placing the monitor on foreign objects, That could scratch the surface of the panel or cause "Mura".

The panel is placed facedown on the lap. That may cause "Mura".

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2. Specification

1. INTPRODUCTION

FEATURES Size 15 “ Luminance (Typ) Contrast Ratio (Typ) 600:1

TFTLCD PANEL

Input Signal

Sync Compatibility

Compatibility

Power Voltage AC 100-240V, 50/60Hz Yes

Power Consumption

Audio Yes(For VA503m Only)

Ergonomics

OSD Control [ 1 ] [▼] [▲] [ 2 ] [ ] Yes

Dimension

Weight

Operating Condition

Storage Condition

Regulation

Colors (6 bits + 2 bits FRC) 16.2 M Response Time (Typ) 8 ms Viewing Angle (H/V) 150 ° / 130 °

Recommend resolution 1024 x 768 @60Hz

Analog (75ohms, 0.7/1.0 Vp-p) Yes

Digital No

Separate Sync Yes Composite Sync No Sync on Green No PC Yes Power Mac Yes

TV Box (NextVision 6) Yes

On Mode(Max)

Off Mode (Max)

Tilt ( 20 ° - -4 °) Yes Swivel No Pivot No Height Adjust No

Physical (W x H x D) 378 x 400 x 210 mm Package (W x H x D) 440 x 485 x 147 mm Physical (Net Weight) 4.0 kg Package (Gross Weight) 5.1 kg Temperature ( / )℉℃ 32℉-104 / 0℉℃-40℃ Humidity (%) 20 % - 90 % Temperature ( / )℉℃ -4℉-140 / ℉ -20℃-60℃ Humidity (%) 5 % - 90 % UL/cUL, FCC DOC, CB, CE, NOM, MIC, IRAM/S, GS(Nemko), ERGO, ISO13406-2 PAR Part 2, TCO’03, GOST, SASO, BSMI, CCC, (PSB),C-TICK, EPA(Ver.4.0), Energy Star

VA503b-2 / VA503m-2

250 cd/㎡

≦ 23 W

≦ 1 W

2 GENERAL specification

Test Resolution & Frequency 1024 x 768 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls

Factory Default: Contrast = 70%, Brightness = 100%

3 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

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Equal to twice the weight of the monitor for five minutes

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Video Signals Video RGB (Analog) - 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 DDC 1/2B Compliant with Revision 1.3 Sync Compatibility Separate Sync

Video Compatibility

Resolution Compatibility

Exclusions Not compatible with interlaced video

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

4 POWER SUPPLY

Internal Power Supply

Part Number: ILPI-019 Input Voltage Range 90 TO 264 VAC Input Frequency Range 47.5 TO 63 HERTZ Short Circuit Protection Output can be shorted without damage Over Current Protection 5 A typical at 14 VDC Leakage Current 3.5 mA (Max) at 254VAC / 60Hz Efficiency 80 % typical at 115VAC Full Load

Fuse Internal and not user replaceable Power Dissipation 23 Watts (max) Max Input AC Current 1.2 Arms @ 100VAC, 0.6 Arms @240VAC Inrush Current (Cold Start) 40A @ 120 VAC, 60 A(max) @ 220 VAC

Shall start and function properly when

Power Supply Cold Start

under full load, with all combinations of

input voltage, input frequency, and

operating temperature

Shall be able to withstand an ANSI/IEEE Power Supply Transient Immunity

C62.41-1980 6000V 200 ampere ring wave

transient test with no damage

Shall be able to withstand 1.5 times Power Supply Line Surge Immunity

nominal line voltage for one cycle with no

damage

Shall be able to function properly, without

Power Supply Missing Cycle Immunity

reset or visible screen artifacts, when ½

cycle of AC power is randomly missing at

nominal input

The power supply shall not produce audible

noise that would be detectable by the user.

Power Supply Acoustics

Audible shall define 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

Length = 1.8m. Connects to AC/DC Power

Color = Black Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption

ON Mode < 23 W (max)

POWER SAVING < 2W ,OFF < 1W Recovery Time On Mode = N/A, Active Off < 3 sec

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5 ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 62 kHz

50 – 85* Hz.

Vertical Refresh Rate

Maximum Pixel Clock 80 MHz Sync Polarity

Timing Table

Item Timing Analog

1 640 x 350 @ 70Hz, 31.5kHz 2 640 x 400 @ 70Hz 3 640 x 480 @ 50Hz 4 640 x 480 @ 60Hz, 31.5kHz 5 640 x 480 @ 67Hz, 35.0kHz 6 640 x 480 @ 72Hz, 37.9kHz 7 640 x 480 @ 75Hz, 37.5kHz 8 640 x 480 @ 85Hz, 43.27kHz

9 720 x 400 @ 70Hz, 31.5kHz 10 800 x 600 @ 56Hz, 35.1kHz 11 800 x 600 @ 60Hz, 37.9kHz 12 800 x 600 @ 72Hz, 48.1kHz 13 800 x 600 @ 75Hz, 46.9kHz 14 800 x 600 @ 85Hz, 53.7kHz 15 832 x 624 @ 75Hz, 49.7kHz 16 1024 x 768 @ 60Hz, 48.4kHz 17 1024 x 768 @ 70Hz, 56.5kHz 18 1024 x 768 @ 72Hz, 58.1kHz 19 1024 x 768 @ 75Hz, 60.0kHz

*1. Tolerance ≧ ± 2kHz. *2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message

without blanking.

*3. The image quality of 85Hz mode might be worse than 75Hz.

Primary Presets

1024 x 768 @ 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 Image Adjust” time.

● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto Image

Adjust”.

The monitor needs to do “Auto Image Adjust” the first time when a new mode is detected. (See section “0-Touch™

* When the resolution is set to 1024 x 768 , the vertical refresh rate may be up to 75 Hz; for other resolutions, the vertical refresh rate may be up to 85Hz.

Independent of sync polarity.

Yes Yes Yes Yes Yes Yes Yes

Yes

Yes Yes Yes Yes Yes

Yes

Yes Yes Yes Yes Yes

Function Actions”)

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Main Menu Controls Auto Image Adjust

Contrast/Brightness* Audio Adjust (For VA503m only)

Volume*3, Mute*3

Color Adjust

sRGB, 9300K, 6500K(default), 5400, User Color [R, G, B] Information H Frequency, V Frequency, Pixel Clock, Resolution, Serial Number, Model Number,

“www.ViewSonic.com

Manual Image Adjust

H. Size, H/V Position

”

Fine Tune, Sharpness*2

Setup Menu

Language [English, French, German, Italian, Spanish, Finnish, Simplified Chinese

Traditional Chinese, Japanese], Resolution Notice, OSD Position*

Timeout*

Memory Recall

These functions can be recalled to default by [▼]+ [▲]

These functions are not available under Native Resolution Mode

These functions setting can be recalled to default by [▼]+[▲] under audio mode

The function execute are 5,15,30,60sec

, OSD Background

, OSD

[Remark] Please refer to the detail in the Appendix C

Factory Defaults

Item Defaults Item Defaults

Contrast 70% Volume

(For VA503m only)

50%

Brightness 100% Balance N/A Color Temperature 6500K Treble N/A Sharpness 0% Bass N/A OSD H. Position 50% 720x400/640x400 720x400

OSD V. Position 50%

OSD Time Out 15 Sec

640x480@60Hz 720x480@60Hz

In SOG and Composite,

720x480@60Hz

640x480@60Hz

N/A

640x480@60Hz

In SOG and Composite,

OSD Background Enabled

1152x864@75Hz

N/A

1152x870@75Hz

In SOG and Composite,

Resolution Notice Enabled

1280x768@60/75/85Hz 1024x768@60/75/85Hz

N/A

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AUDIO INTERFACE (SPEAKER SPECIFICATION) --- (For VA503m only)

Line input connection 3.5 mm stereo jack Line input signal 1.0Vrms Line input impedance >10 kOhm Maximum power output (Electric) 1 W @ < 8% distortion Signal to Noise Ratio 50 dB Frequency response 500 Hz – 20 Khz

Distortion

< 8 % THD (@1kHz)

There should be no audible vibration with

Vibration

volume at 100%. (Input signal within 1.0 Vrms)

Screen image

There should be no affect on the screen

image stability under any conditions Connector PC99 requirement Audio in Lime Green pantone # 577C Cable type / length 3.5mm stereo cable / 1.8m length

Note: There is no guarantee <1 W power Audio DPMS

consumption in Active Off mode, when the

Audio Cable is connected

TFT LCD PANEL

Panel Source

INN MT150XN03 V0 Type TN, LVDS Active Size 304.1 mm (H) x 228.1mm (V) Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.297 mm Glass Treatment Anti Glare (Hard coating 3H) # of Backlights 2 CCFL edge-light Backlight Life 30,000 Hours (Min) (@8mA) Luminance –Condition: CT = 6500 K

Contrast = Max, Brightness = Max

250 cd/m2 (Typ after 30 minute warm up)

200 cd/m2 (Min after 30 minute warm up)

Brightness Uniformity 80% (typ) / 75 % (min) Contrast Ratio 700 :1 (Typ), 500 :1 (Min) Color Depth Vertical) 16.2 million colors (6+2 bit panel) Viewing Angle (Horizontal) 150 deg (Typ)@ CR>10 Viewing Angle (Vertical) 130 deg (Typ) @ CR>10 Response Time 10%-90% @ Ta=25°C

8 ms (Tr= 2 ms, Tf = 6 ms) (Typ)

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

Panel Defects Please see Panel Quality Specifications.

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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 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 10.

Main Menu

with OSD controls

Displays the control screen

for the highlighted control.

Also toggles between two

controls on some screens.

Also a shortcut to Auto

Image Adjust.

Displays the

Main Menu or

exits the

control screen

and saves

adjustments.

Front Control Panel

shown below in detail

Power light Green = ON Orange = Power Saving

Standby Power On/Off

Scrolls through menu options and adjusts the displayed control.

Also a shortcut to display the Contrast adjustment control screen.

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Do the following to adjust the display setting:

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

NOTE: All OSD menus and adjustment screens disappear automatically after about 15

seconds. This is adjustable through the OSD timeout setting in the setup menu.

2. To select a control to adjust, pressSorTto scroll up or down in the Main Menu.

3. After the desired control is selected, press button [2]. A control screen like the one shown

below appears.

The line at the bottom of the screen shows the current functions of buttons 1 and 2: Exit or select the Brightness control.

4. To adjust the control, press the up S or down T buttons.

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

The following tips may help you optimize your display:

• Adjust the computer's graphics card so that it outputs a 1024 x 768 @ 60Hz video signal to the LCD display. (Look for instructions on “changing the refresh rate” in the graphics 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 S and down T 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 adjusts background black level of the screen image.

Audio Adjust Vol ume increases the volume, decreases the volume, and mutes the audio. Mute temporarily silences audio output.

Color Adjust provides several color adjustment modes, including preset color

temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the sRGB setting will cause the Contrast and Brightness adjustments to be disabled.

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.

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

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Control Explanation

User Color Individual adjustments for red (R), green (G), and blue (B).

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

2. To adjust selected color, pressSandT.

Important: If you select RECALL from the Main Menu when the product is

set to a Preset Timing Mode, colors return to the 6500K factory preset.

Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).

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

Manual Image Adjust displays the Manual Image Adjust menu.

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

H./V. Position (Horizontal/Vertical Position) moves the screen image left or

right and up or down.

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Control Explanation

Fine Tune sharpens the focus by aligning text and/or graphics with pixel

boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

Setup Menu displays the menu shown below:

Language Select allows the user to choose the language used in the menus and

control screens.

Resolution Notice displays the Resolution Notice menu shown below.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD 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 the user to turn the OSD background On or Off.

Memory Recall returns the adjustments back to factory settings if the display is

operating in a factory Preset Timing Mode listed in the Specifications of this manual. Exception: This control does not affect changes made with the User Color control, Language Select or Power Lock setting.

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4. Circuit Description

2. Electronic Circuit Theory

2.1 Switching Mode Power Supply

2.1.1 AC Current Input Circuit

P801 is a connector for connecting AC Power. F801 is a fuse to protect all the circuit. AC input voltage is from 90V to 264V. R820 and R821 joined between two inputting main circuit to prevent man from shock. L801 is used to clear up low frequency wave. C801 and C806 are used to discharge the waves that L801 produced. High frequency waves are damped by C801 and C806. D801 is a rectifier which composed of 4 build-in diodes, it inverts AC to DC.

2.1.2 High Voltage to Low Voltage Control Circuit

C805 is used to smooth the wave from rectifier. IC802 is a highly integrated PWM controller, which build-in a power MOSFET. When rectified DC high voltage is applied to the DRAIN pin during start-up, the MOSFET is off initially, and the CONTROL pin capacitor is charged through a switched high voltage current source connected internally between the DRAIN and CONTROL pins. When the CONTROL pin voltage Vc reaches approximately

5.8V, the control circuitry is activated and the soft-start begins. The soft-start circuit gradually increases the duty cycle of the MOSFET from zero to the maximum value over approximately 10ms. If no external feedback/supply current is fed into the CONTROL pin by the end of the soft-start, the high voltage current source is turned off and the CONTROL pin will start discharging in response to the supply current drawn by the control circuitry.

Resistor R803, R807, R824 and R825 are for line over voltage shut-down (OVP) and line under-voltage detection (UVP).Resistors R801, R805, R822, and R823 are for external current limit adjustment, and used to reduce the current limit externally to a value close to the operating peak current of primary about 1.35A. The mean is power will protected when the primary current over about 1.35A.

When PWM is turned off, the main current flow will be consumed through D804 and ZD802, This will prevent MOSFET which built-in IC802 from being damaged under large current impulse and voltage spike.

D806 and C815 provide internal Auxiliary current to CONTROL pin during normal operation. In addition, error amplifier and feedback current to the CONTROL pin are for duty cycle control.

2.1.3 DC_5V and DC_14V Output Circuit

For DC 5V, D805 is used to rectify the inducted current. R806 and C811 are used to store energy when current is reversed. The parts including C812, C814, C822, C821, B801 and L803 are used to smooth the current waves.

For DC 14V, D803 is used to rectify the inducted current. R802 and C802 are used to store energy when current is reversed. The parts including C808, C810 and L802 are used to smooth the current waves.

2.1.4 Feedback and OVP Protect Circuit

Pin R of IC803 is supplied 2.5V stable voltage. It is connected to 5V and 14V output through R811, R810 and R818. R811, R810 and R818 are output sampling resistor. When the sampling voltage more than 2.5V or less than 2.5V, feedback current of IC802 will change, this can change the voltage from transformer T801.

Q802, R827, R828 and ZD801 make up of dummy loading circuit. For start-up sequence, during 5V output take place high loading first, this dummy loading circuit operated to insure 14V not be increased.

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2. 2 Inverter Circuit

2.2.1 Low voltage to high voltage circuit

14VDC provides the power for IC501; the control signals Brightness and ON/OFF come from I/F board.

ON/OFF signal connect to pin10 of IC501 and makes IC501 enable. Brightness signal connect to pin4 of IC501 and regulates the panel brightness, R526, R529, C505 make up a network of delaying time circuit and R523, R524 make up a divided voltage network, C504 is used to dump noise. The operation frequency is determined by the external Resistor R522 and capacitor C529 connected to pin13 of IC501. BURST MODE regulated dimming frequency is determined by the external resistor R527 and capacitor C506 connected to pin11 of IC501. C508 is used for soft start and compensation, C507, C505 are used for dump noise.

The output drives, include DRV1, DRV2 (pins1,15 respectively) output square pulses to drive MOSFET U501, U502, and each of U501, U502 , is consist of a N channel MOSFET. U501,OR U502 work as Push-Pull- topology, it is high efficient, PWM switching.

During start up, VSEN (pin6) senses the voltage at the transformer secondary. When VSEN reaches 3.0V, the

output voltage is regulated. If no current is sensed approximately 2seconds IC501 shut off.

The current flowing through CCFL is sensed and regulated through sense resistor R509, R534. The feedback voltage connected to Pin5 (ISEN), then compared with a reference voltage (1.5V) via a current amplifier, resulting in PWM drive outputs to PUSH-PULL switches.

2.2.2 Protection circuit

Over Voltage Protection and over-current protection are monitored by the voltage on VSEN(Pin 6) During normal operation , if a CCFL is damaged or removed ,the voltage at VSEN (Pin6) increases .Once the voltage at VSEN exceeds 2.0V (OVPT Setting) the driver output duty cycle is regulated and the shutdown delay timer is activated.OVPT set the overall protection threshold voltage that is lower than 3V (VSEN threshold). Once the voltage at TIMER pin reached about 3v ,the IC will shut down and latch .R501, R503,C525,C527 are connected in high voltage output connector, the divided AC voltage is inverted DC voltage through D503, D504,D507,D508 ,R530 and C516are used to rectify wave & dump noise. Then the voltage signal reaches Pin6 VSEN of IC501, when the voltage changes, build-in PWM of IC501 will adjust output voltage.

Open Lamp Protection: In normal operation, R509 are sensed a high level DC voltage,If a CCFL is removed or damaged during normal ,the voltage at SSTCMP(Pin12) rises rapidly .when the voltage at SSTCMP reaches a threshold of approximately 2.5V,a current source charges the capacitor(C511)connected to TIMER(Pin3).Once the voltage level at the TIMER pin reaches a threshold of approximately 3v,The drive outputs shut down and latch.

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2.3 I/F Board Circuit

2.3.1 Power Input

+3.3V is from the power board and supply for U101(LD1117AL-1.8V)﹑U102(AT24C02N) ﹑U103(TSUM16AL) ﹑ U104(SST25VF010A) ﹑U105(AT24C04N) ﹑panel and LED. +1.8V output is generated from +3.3V through C104 and C105 filtering, and U101 outputs. +1.8V is only used for U105.

2.3.2 MCU & Scaler(TSUM16AL)

The frequency of XTAL1 is 14.318MHz. U103 # 48 is defined as panel-enable. When the I/O port is low, Q106 and Q105 are conducted. And then after C116 and C117 filtering, obtain the voltage of VLCD, which will be connected to CN104. U103 # 85 is defined as CCFL-enable. When the I/O port is low, Q102 is pulled up and the backlights are on; When the I/O port is high, Q106 is conducted and the backlights are off. U103 # 35 is defined as DET-VGA, connected with CN103 # 5. U103 # 84 is a pin of hardwire reset. U103 # 54-# 55,# 58-# 65 output LVDS digital data of 8 bit to panel control circuit through CN104. U103 # 86 generates a PWM waveform by regulating the duty to control the brightness of the backlights. U102 is EEPROM used for saving EDID data, which is connected by SCL and SDA pins with # 31 and # 30 of TSUM16AL. U104 is a flash memory, U104 # 2, # 1, # 6, # 5 are the communications with U103 # 37-# 40. U105 is EEPROM used for saving user’s OSD setting. U105 is connected by SCL and SDA pin with # 44 and # 43 of TSUM16AL.

2.3.3 VGA Input

Signal R, G, B input through CN103 # 1, # 2, # 3, and C116, C117 and C118 filtering the high frequency noise. Signal HSYNC and VSYNC input through CN103 #13 and #14, and C126, R131, C125, R130 filtering. Then the analog signal enters U103, and then U103 deals with it internally. In addition, D101, D102, D103, D104 (the four are BAV99), ZD101, ZD102, ZD103, ZD104, ZD105 (they are constant voltage diode of 5V6) are ESD protector. Signal DDC-SCL inputs via CN103 # 15, and then passes through ZD101 for ESD protection, goes into EDID EEPROM IC U102. Signal DDC-SDA inputs via CN103 #12, and then passes through ZD105 for ESD protection, goes into EDID EEPROM IC U102. CN103 # 5 is defined as cable detect pin, this detector realizes via R126 and U103 # 35,The PC-5V of U102 is supplied by PC via CN103 # 9 with ZD102 for ESD protection, or supplied by Monitor self via D105.U105 is an EEPROM IC, which is a kind of memory and used for saving EDID data.

2.3.4 Button Control

Button “Key-Power” is defined as power on/off, which is connected to U103 # 90 through CN101 # 6. Button “Key-2” is defined as two functions of selecting and adjustment, which is connected to U103 # 94 through CN101 # 5. Button “Key-Up” is defined as plus, which is connected to U103 # 95 through CN101 # 8. Button “Key-Down” is defined as minus, which is connected to U103 # 99 through CN101 # 7. Button “Key-1” is defined as two functions of menu and exit, which is connected to U105 # 89 through CN105 # 4. LED indicator on the front bezel is defined as follows: a. When press button “Key-Power”, U103 # 91 is pulled low and U103 # 92 is pulled high, so Q103 is conducted

and the LED indicator is green.

b. When in power-saving mode, U103 # 91 is pulled high and U103 # 92 is pulled low, so Q104 is conducted and

the LED indicator is orange.

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3. FACTORY PRESET TIMING TABLE

TIMING

640x350@70Hz

640x400@70Hz

720x400@70Hz

640x480@50Hz

640x480@60Hz

640x480@67Hz

FH(KHz) FV(Hz)

31.469 + 800 640 96 48

70.086 − 449 350 2 60

31.469 − 800 640 96 48 IBM

70.086 − 449 400 2 35

31.469 − 900 720 108 54 IBM

70.087 + 449 400 2 35

24.700 − 800 640 96 48

50.000 − 494 480 2 8

31.469 − 800 640 96 40 VESA

59.940 − 525 480 2 25

35.000 ( 864 640 64 96

66.667 ( 525 480 3 39

Sync Polarity

Total (Dot/Line)

37.861 ( 832 640 40 120 VESA

640x480@72Hz

72.809 ( 520 480 3 20

37.500 ( 840 640 64 120 VESA

640x480@75Hz VESA

640*480@85Hz

800x600@56Hz

800x600@60Hz

800x600@72Hz

800x600@75Hz

VESA 800*600@85Hz

832x624@75Hz

1024x768@60Hz

1024*768@70Hz

1024*768@75Hz

1024*768@72Hz

75.000 ( 500 480 3 16

43.269 ( 832

85.008

35.156 + 1024 800 72 128 VESA

56.250 + 625 600 2 22

37.879 + 1056 800 128 88 VESA

60.317 + 628 600 4 23

48.077 + 1040 800 120 64 VESA

72.188 + 666 600 6 23

46.875 + 1056 800 80 160 VESA

75.000 + 625 600 3 21

−

53.674 + 1048 800 64 152

85.061 + 631 600 3 27

49.726 − 1152 832 64 224 MAC

74.550 − 667 632 3 39

48.363 − 1344 1024 136 160 VESA

60.004 − 806 768 6 29

56.476 − 1328 1024 136 144 VESA

70.069 − 806 768 6 29

60.023 + 1312 1024 96 176 VESA

75.029 + 800 768 3 28

57.700 − 1360 1024 136 144

72.125 − 800 768 6 26

509 480 3 25

Active (Dot/Line)

Sync Width (Dot/Line)

Back Porch (Dot/Line)

640 56 80

Pixel Freq.(MHz)

25.175

28.322

19.760

25.175

30.240

31.500

36.000

40.000

50.000

49.500

56.250

57.283

65.000

75.000

78.750

78.472

4. Power On/Off Sequence

4.1 Hardware Power ON

When power cord is plugged into AC socket, SMPS starts work and provides U103 with VCC3.3V. When VCC3.3V inputs, U103 resets circuit active, sets U103 all registers to preset modes, and then monitor goes into stand-by mode. That means hardware power on has been completed.

4.2 Software Power ON/OFF

When press power key, U103 # 90 recieves low pulse,and then U103 will do the power on/off.

- If Power ON, U105 # 91(LED_Green) will send out Low potential, and then LED green on.

- If Power OFF, U105 # 91(LED_Green) will send out High potential, and then LED Off.

The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency.

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T1 (ms) T2 (ms) T3 (ms) T4 (ms) T5 (ms) T6 (ms) T7 (ms)

0.5~10 0~50 > 200 > 200 0~50

5. AC Outlet Pin Assignment

1 2

Pin Symbol Description

1 L Live

2 N Neutral

﹤100

> 500

P801

3 E GND

6. Inner Connector Pin Assignment

6.1 CN501, CN502, CN503, CN504 (Connect to Panel Backlight, SM02B-BHSS-1-TB or equivalent)

Pin Symbol Description

1 H.V. High voltage for lamp 2 L.V. Low voltage for lamp

6.2 CN101 (Power BD to Interface BD)

Pin No. Symbol Description

1 VCC3.3 +3.4V INPUT

2 VCC3.3 +3.4V INPUT

3 GND GND

4 ON/OFF CCFL on/off control

5 BRIGHTNESS Panel luminance control (CCFL brightness)

6 GND Ground

7 VOL Volume control input (For VA503m only)

8 MUTE Mute control input (For VA503m only)

6.3 CN106 (Interface BD to Keypad)

No.

1 LED_ORANGE Orange LED lighting control

Symbol Description

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2 LED_GREEN Green LED lighting control

3 GND Ground

4 KEY_MENU/EXIT OSD page selection and exit

5 KEY_SELECT/AUTO Select control and auto adjustment control

6 KEY_POWER DC power on/off control

7 KEY_DOWN OSD “▼” control to adjust value to decrease

8 KEY_UP OSD “▲” control to adjust value to increase

6.4 CN103 (Connect I/F BD to panel, FI-X30S-H or Equivalent) Pin No. Symbol Function

1 GND Ground

2 GND Ground

3 RXE3+ plus signal of even channel 3(LVDS)

4 RXE3- minus signal of even channel 3(LVDS)

5 GND Ground

6 RXEC+ plus signal of even clock channel (LVDS)

7 RXEC- minus signal of even clock channel (LVDS)

8 GND Ground

9 RXE2+ plus signal of even channel 2(LVDS)

10 RXE2- minus signal of even channel 2(LVDS)

11 GND Ground

12 RXE1+ plus signal of even channel 1(LVDS)

13 RXE1- plus signal of even channel 1(LVDS)

14 GND Ground

15 RXE0+ minus signal of even channel 0(LVDS)

16 RXE0- plus signal of even channel 0(LVDS)

17 GND Ground

18 GND Ground

19 VCC Power supply (5.0 V)

20 VCC Power supply (5.0 V)

6.5 CN102 (D-SUB Connector)

Pin Symbol Pin Symbol Pin Symbol

1 Red video input 6 Red GND 11 GND

2 Green video input 7 Green GND 12 Serial data (SDA)

3 Blue video input 8 Blue GND 13 H / H+V SYNC

4 GND 9 +5V(from PC) 14 VSYNC

5 Cable Detect 10 GND 15 Data clock line (SCL)

7. Key Parts Pin Assignment

7.1 IC802 (TOP245Y or TOP246Y, Power Control IC)

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Pin Symbol I/O Description

1 C I Control 2 L I Line Sense 3 X I External Current Limit 4 S O Source of MOSFET(GND) 5 F I Frequency 6 D I Drain of MOSFET

7.2 IC501 (OZ9938GN, CCFL inverter controller IC)

Pin No. Symbol I/O Description

1 DRV1 O Drive output

2 VDDA I Supply voltage input

3 TIMER I Timing capacitor to set striking time and shut down delay time

4 DIM I

5 ISEN I Current sense feedback 6 VSEN I Voltage sense feedback 7 OVPT I Over-voltage/over-current protection threshold setting pin 8 NC

9 NC

10 ENC I ON/OFF control of IC

11 LCT I

12 SSTCMP I Capacitor for soft start time and loop compensation

Analog dimming or Internal LPWM dimming or external PWM pulse input for dimming function

Timing capacitor to set internal PWM dimming frequency and also a pin for analog dimming selection

13 CT I Timing resistor and capacitor for operation and striking frequency

14 GNDA Ground for analog signals

15 DRV2 O Drive output

16 PGND Ground for power paths

7.3 U103(TSUM16AL)

Pin Symbol I/O Description

1 NC Not connected

2 GND Ground

3 NC Not connected

4 NC Not connected

5 GND Ground

6 NC Not connected

7 NC Not connected

8 AVDD_DC I ADC Power

9 NC Not connected

10 NC Not connected

11 GND Ground

12 NC Not connected

13 NC Not connected

14 AVDD_DC I ADC Power

15 REXT External resistor 390 ohm to AVDD_ADC

16 AVDD_PLL I PLL Power

17 BIN0M I Reference ground for analog blue input

18 BIN0P I Analog blue input

19 GIN0M I Reference ground for analog green input

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20 GIN0P I Analog green input

21 SOGIN0 I Sync-on-green input

22 RIN0M I Reference ground for analog red input

23 RIN0P I Analog red input

24 AVDD_ADC I ADC Power

25 REFM Internal ADC bottom de-coupling pin

26 REFP Internal ADC top de-coupling pin

27 HSYNC0 I Analog HSYNC input

28 VSYNC0 I Analog VSYNC input

29 GND Ground

30 DDCA_SDA/RS232_TX I/O

31 DDCA_SCL/RS232_RX I/O

32 VDDP I Digital Output Power

33 GND Ground

34 VDDC I Digital Core Power

35 GPIO_P15/PWM0 I/O

36 NC Not Connected

37 SDO I SPI Flash Serial Data Output

38 SCZ O SPI Flash Chip Select

39 SCK O SPI Flash Serial Clock

40 SDI O SPI Flash Serial Data Input

41 NC Not Connected 42 GPIO_P22 I/O General Purpose Input/Output; 4mA driving strength

43 GPIO_P11/I2C_MDA I/O

44 GPIO_P10/I2C_MCL I/O

45 NC Not Connected 46 NC Not connected 47 NC Not connected

48 GPIO_P27/PWM1 I/O

DDC Data for Analog Interface; 4mA driving strength/UART Transmitter/GPIO DDC Clock for Analog Interface/UART Receiver/GPIO

General Purpose Input/Output; 4mA driving strength/Pulse Width Modulation Output; 4mA driving strength

General Purpose Input/Output; 4mA driving strength/I2C Master Data

General Purpose Input/Output; 4mA driving strength/I2C Master Clock

General Purpose Input/Output; 4mA driving strength/Pulse Width Modulation Output; 4mA driving strength

49 VDDP I Digital Output Power

50 GND Ground

51 VDDC I Digital Core Power

52 MODE[0] I Chip Configuration Input

53 MODE[1] I Chip Configuration Input

54 LVA3P O A-Link Positive LVDS Differential Data Output

55 LVA3M O A-Link Negative LVDS Differential Data Output

56 VDDP I Digital Output Power

57 GND Ground

58 LVACKP O A-Link Positive LVDS Differential Clock Output

59 LVACKM O A-Link Negative LVDS Differential Clock Output

60 LVA2P O A-Link Positive LVDS Differential Data Output

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61 LVA2M O A-Link Negative LVDS Differential Data Output

62 LVA1P O A-Link Positive LVDS Differential Data Output

63 LVA1M O A-Link Negative LVDS Differential Data Output

64 LVA0P O A-Link Positive LVDS Differential Data Output

65 LVA0M O A-Link Negative LVDS Differential Data Output

66 VDDC I Digital Core Power

67 NC Not Connected

68 NC Not Connected

69 NC Not Connected

70 NC Not Connected

71 NC Not Connected

72 NC Not Connected

73 NC Not Connected

74 NC Not Connected

75 VDDP I Digital Output Power

76 GND Ground

77 NC Not Connected

78 NC Not Connected

79 GND Ground

80 BYPASS For External Bypass Capacitor

81 NC Not connected

82 VDDC I Digital Core Power

83 GND Ground

84 RST I Chip Reset; High Reset

85 GPIO_P12 I/O General Purpose Input/Output; 4mA driving strength

Pulse Width Modulation Output; 4mA driving

86 PWM1/GPIO_P25 I/O

87 RSTN I Chip Reset; Low Reset

88 GPIO_P00/SAR1 I/O

89 GPIO_P01/SAR2 I/O

90 GPIO_P02/SAR3 I/O

91 GPIO_P06 I/O

92 GPIO_P07 I/O

93 PWM0/GPIO_P26 I/O

94 GPIO_P13 I/O General Purpose Input/Output; 4mA driving strength

95 GPIO_P14 I/O General Purpose Input/Output; 4mA driving strength

strength/General Purpose Input/Output; 4mA driving strength

General Purpose Input/Output; 4mA driving strength/SAR ADC Input

General Purpose Input/Output; 6/12mA programmable driving strength

Pulse Width Modulation Output; 4mA driving strength/General Purpose Input/Output; 4mA driving strength

96 XIN I Crystal Oscillator Input

97 XOUT O Crystal Oscillator Output

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98 AVDD_MPLL I MPLL Power

99 GPIO_P16/PWM2 I/O

100 NC Not connected

General Purpose Input/Output; 4mA driving strength/ Pulse Width Modulation Output; 4mA driving strength

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5. Adjustment Procedure

1. Key Function Description

CONTROL KEY KEYS FUNCTION

[AUTO] [2] By pressing [AUTO] key, “Auto Image Adjust” is performed

[MENU] [1] By pressing [MENU] key, Main menu display

A. When “MENU OSD” display, press these keys to change the contents of an

[▼] [▲]

[POWER] Power on or power off the monitor

adjustment item, or change an adjustment value

B. When “MENU OSD” is un-display, press these keys to change brightness and

contrast

2. Hot Key Operation

Hot Key Function

Item Function Detail

[▲] + [▼]

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

[1] + [▼] + [▲] (keep pushing 5 sec)

[1] + [▼] Power Lock

[1] + [▲] OSD Lock

[▼] + [▲]+ [ ] Enter Factory Mode

Remark: All the function above are only available while OSD off

Recall Contrast or Brightness while in the Contrast or Brightness adjustment;

Recall both Contrast and Brightness when the OSD is not open

White Balance (Not shown on user’s guide)

3. OSD Control

3.1 OSD table

Layer 1 Layer 2 Layer 3

Auto Image Adjust

Contrast/Brightness

Audio ( for VA503m only)

Color Adjust

Information Manual Image Adjust

Contrast (+ / -)

Brightness (+ / -)

Volume Volume (+ / -)

Mute sRGB 9300K 6500K 5400K

User Color

H/V Position

H Size + / -

Fine Tune + / -

On/Off

Red (+ / -)

Green (+ / -)

Blue (+ / -)

H Position (+ / -)

V Position (+ / -)

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Setup Menu

Memory Recall

3.2 OSD lock Menu function

OSD Lock Menu Function Check

Item Method Phenomenon

Activate OSD lock [1] + [▲] 10S

Sharpness + / -

English

French

German

Italian

Language Select

Resolution Notice On/Off

OSD Position

OSD Time Out

OSD Background On/Off

Spanish

Finnish

Japanese

Simplified Chinese

Traditional Chinese

H Position (+ / -)

V Position (+ / -)

Press any of buttons"1", "▼", "▲", "2" will appear "OSD Locked" 3s

Deactivate OSD lock: [1] + [▲] 10S(again)

NOTICE: When the OSD is locked will lock all functions. Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD Locked” OSD Lock should not lock Power Button and Power Lock function

3.3 Power lock Menu function

Power Lock Menu Function Check

Item Method Phenomenon

Activate Power Lock [1] + [▼] 10S

Deactivate Power Lock [1] + [▼] 10S(again)

NOTICE: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button Locked” Power should only be lockable in the “On State”

3.4 Resolution notice function

Item Method Phenomenon

Activate Resolution Notice Menu

Resolution Notice Menu

Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec, And it should disappear after 10s or by pushing button [1] or [2]

Can not turn off the LCD; Press the power button will appear "Power Button Locked" OSD 3s; LCD would automatically turn back "On" when power is restored after a power failure

------

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Deactivate Resolution Notice Menu

Push button [2] under Resolution Notice OSD, select Disable

-------

3.5 Factory Mode Introduction

When input the signal, press “power key” to turn off the monitor. Press” [▼] +[▲] +[ ] “at the same time so

as to enter factory mode. After power on, press ‘’Menu[1]’’ key, you can see the Factory menu.

INL-V7 : Currently using panel model name V3 060620 : Currently using firmware version information. Auto Color : Automatically calibrate chip ADC parameter by using chip internal DAC Color Temperature : The R, G, B of 9300K and 6500K and 5400K and User Mode

Colors are all generated from scaling back end.

4. Burn-in pattern

If it is a new monitor, and in factory mode, if no VGA signal input, Burn-in pattern will self generate automatically. Burn in patterns are: full Red, Green, Blue, White and Black. You can not escape from Burn-in pattern until plug in VGA Cable, and then press the power key. Turn the monitor off and then turn it on.

5. Auto Color (Automatically calibrate chip ADC parameter by using chip

internal DAC)

If it is a new-built set and it is first time to do the “auto color”, please confirm the following steps:

-Connect the VGA cable with the standard video pattern generator and display 16-gray pattern on the monitor.

- Press “Power” to power off the monitor.

- Press” [▼] +[▲] +[

- Press ‘’Menu[1]’’, then press ‘’Auto[2]’’ to execute Auto color item.

- After the “Auto Color” process finished, please press “Power” to restart monitor.

] “simultaneously to enter factory mode.

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6. EDID (Rewrite EDID data to EEPROM)

If we need to rewrite the EEPROM data, please confirm the following steps.

1. Plug in VGA Cable; we can rewrite the EDID data to EEPROM by using “EDID Rewrite” program.

2. If the “EDID Rewrite” process finished, please pull out VGA cable and press ‘’2’’+’’▲’’ at the same time.

3. Pull out AC power cable or press power key to restart.

7. Upload firmware to MCU via VGA Cable

7.1 Connect ISP board between monitor and PC as below configure

ISP Board

Print Port

Insert to Print Port 25pin CON on PC

25PIN

D-SUB

15PIN

Service cable

LCD Monitor D-Sub

7.2 Using mStar ISP Tool Update FW: (1). Seletct “Read”, Choose the corresponding firmware, load to MCU.

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(2). Select “Connect”, auto connect for ISP.

(3). Select “Run”, start ISP.

(4). When the picture show “Verify OK”, ISP finished.

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8 After repair, to ensure the quality you should do the following test and

adjustment

Item Content Equipment

Test OSD function

Contrast Check

Color Temperature

Modes switching

check

Y measurement at default setting

1.Signal is set as 1024 x 768 @60Hz

2. LCM button are from left to right, checking whether each single function key and compound function key can be worked.

1. Set input mode to 1024 x 768 @60Hz

2. Set Pattern to 32 gray shades

3. Set contrast to the max. The brightest 6~8 shades brightness cannot

be distinguished.

1. Do “Auto color” at 640 x 480@60Hz, 5-Mosic pattern

2. Measure color temperature, check it complies with the following

temperature:

5400K x=0.335 +/- 0.02, y=0.350 +/- 0.02

6500K x=0.313 +/- 0.02, y=0.329 +/- 0.02

9300K x=0.283 +/- 0.02, y=0.298 +/- 0.02

1. Use Chroma Pattern Generator to make sequence.

VESA (640x480 800x600 1024x768), MAC 832x624 DOS (640x350 720x400), the detail supported modes and power saving signal.

2. Confirm the above timing modes must be full screen and the

picture must be normal.

3. LED is Orange at power saving mode.

1. Set brightness to default value 100 and contrast to default value

70 at 6500K

2. At full white patter, Measure Y, which should be ≥ 250cd/m²

Chroma Signal Generator

Chroma Signal Generator and color analyzer

Chroma Signal Generator

Chroma Signal Generator and Color Analyzer

Panel Flicker check

Power saving

1. Mode: 1024 x 768 @60Hz

2. Set Brightness& contrast to default value

3. Do “Auto Image Adjust”

4. Shut down PC to check whether there’s glitter on the center of the

picture.

1. Mode: 1024 x 768 @75Hz

2. Pattern: full white

3. Brightness: Max.

4. Contrast: Default

5. Check power consumption at each modes

State Power Consumption LED color Normal Stand By < 2W Orange Power Key Off

≤ 23W

＜1Ｗ

Green

Equipment:: Chroma Signal Generator & PC

Chroma signal generator and Power meter AC input: 230V/50Hz

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VA503m/b Assembly Block

PCBA PWR& Inv/B*1 Cable Power&I/F *1 Lamp wire TAPE*2

(SCREW PW,M3*5,Ni)*5

IF Board*1 Lvds Cable*1

(SCREW PW,M3*5,Ni)*1 (BOLT,#4-40*11.8,Ni)*2

PLATE BASE*1 Rubber Foot*6 BASE COVER*1

SCREW, P,T3*6, Zn*1

Chassis*1 INNOLUX Panel*1

(SCREW PW,M3*4,Ni)*4

ASSY PANEL*1

Back Cover*1

Rubber Cover

Keypad*1 Keypad Cable*1

( Screw , P , cross.T.T3*6,Zn)*2

Bezel*1 Button*1, THREE BIRD Logo*1

ASSY BASE*1

SCREW,P,M4*8,Zn*4

HIGNE COVER*1

ASSY STAND*1 Assy Bezel*1 ASSY BASE*1

VA503m/b

LCD Monitor

Assy Bezel*1

ASSY STAND*1

Stand*1 Spring Sheet*1,

SCREW,F,CROSS,T.T-4*12,Zn

Hinge *1

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VA503m/b DisAssembly Block

PCBA PWR& Inv/B*1

Cable Power&I/F *1 Lamp wire TAPE*2

(SCREW PW,M3*5,Ni)*5

Chassis*1 INNOLUX Panel*1

(SCREW PW,M3*4,Ni)*4

IF Board*1 Lvds Cable*1

(SCREW PW,M3*5,Ni)*1 (BOLT,#4-40*11.8,Ni)*2

PLANE BASE*1 Rubber Foot*6 BASE COVER*1

SCREW, P,T3*6, Zn*1

ASSY BASE*1

ASSY PANEL*1

Back Cover*1

RUBBER COVER

SCREW,P,M4*6,Black*4

HIGNE COVER*1

ASSY STAND*1 Assy Bezel*1 ASSY BASE*1

Keypad*1 Keypad Cable*1

( Screw , P , cross.T.T3*6,Zn)*2

Bezel*1 Button*1, THREE BIRD Logo*1

Assy Bezel*1

ASSY STAND*1

VA503m/b

LCD Monitor

Stand*1 Spring Sheet*1,

SCREW,F,CROSS,T.T-4*12,Zn

Hinge *1

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5. Packing for Shipping and Disassembly Procedure

5.1 Packing for Shipping

5.1.1 Packing Procedure

z Paste protection film to protect the monitor. (Figure 1) z Put the monitor in the PE bag and seal the bag with tape. (Figure 2)

ZZZ

Figure 1 Figure 2

z Disassemble the base by pushing the button.(Figure 3) z Put the cushions on the monitor. (Figure 4) z Place the base into the hole of cushions. (Figure 5) z Place the monitor into the carton and then put all the accessories into the carton. At last, close

the carton. (Figure 6).

Figure 3 Figure 4

Figure 5 Figure 6

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5.2 Disassembly Procedure

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6. Troubleshooting Flow Chart

1. Common Acknowledge

z If you change the interface board, be sure that the U102, U103, U104 and U105 these four

components also changed to the new I/F board because there was program inside. If not, please re-write EDID and upload firmware into U104 via VGA Cable.

z If you adjust clock and phase, please do it at the condition of Windows shut down pattern. z If you confirm the R.G.B. color is normal or not, please do it under 16-grey scalar pattern. z This LCM is analog interface. So if the entire screen is an abnormal color that means the problem

happen in the analog circuit part, if only some scale appears abnormal color that stand the problem happen in the digital circuit part.

z If you check the H/V position, please use the crosshatch pattern. z This LCM support more than 30 timing modes, if the input timing mode is out of specification, the

picture may appears abnormally.

z If brightness uneven, repairs Inverter circuit or change a new panel. z If you find the vertical line or horizontal line lost on the screen, please change panel. z If you find the speaker don’t working, please don’t plug in audio cable, unless change new speaker.

(For VA503m only)

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2. No Power & Power LED Off

No power

Check primary rectifier voltage

Check pin3 of IC802 voltage about 1V

Check pin2 of IC802 voltage about 2V

Check pin1 of IC802 voltage is 5.8V

END

Check circuit if short

Check F801, P801, D801

Check R801, R805, R822, R823, R817

Check R803, R807, R824, R825

Check R812, R816, C818

Check IC802, C805, T801

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3. DC output voltage is unstable

Output Voltage Unstable

Check Vbe of Q801 below

Check reference voltage

0.3V

Check circuit if

short

Check Q802

Check pinR of IC801

Check R810, R811

Check ZD801, D803, D805

Check R809, R814, IC801, R818

Check feedback

circuit

Check Vpin3-4 of IC801 about 6V

Check Vpin1-2 of IC801 about 1V

Check R809, R814

Check C815, D806, R812

END

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 44

4. Output power is unstable

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Unstable power

Check sampling Circuit

Check the R pin voltage of IC803 about 2.5V

Check pin1 of IC802 voltage is 5.8V

Check pin3 of IC802 voltage about 1V

END

Check R810, R811, R818

Check the C pin voltage of IC803 if 3V

Check R809, R808, R814, D809

Check D806, C815 if

short

Change D806, C815

Change R801, R805,

R822, R823, R817

Change R810, R811, R818

Change IC803

Page 45

5. Backlight can’t be turned on

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Check feedback circuit Isen,Vsen.(D503,D504,D501,D502..)

No raster?

Ye s

LED Green?

Ye s

Backlight can’t be turned on.

Ye s

Is there 5Vdc voltage on pin2of IC501?

Ye s

Is there high-level voltage on pin10 of IC501?

Ye s

Are connected rightly CN501, CN502, CN503 and CN504?

Ye s

Is there instantaneously pulse wave on pin1, pin3, pin15 of IC501 at the moment of restart?

Ye s

Is ok T501, T502?

Ye s

Check power supply

Is Ok R526?

Is Ok IC501?

Ye s

Check I/F board

R526 open

Connecting the output connector again

U501, U502 fail

IC501 fail

T501, T502 fail

END

Page 46

6. Black Screen and Backlight Turn on

Black Screen

Check Power Supply:

Pin 1, 2 of CN102

Check Power:

Pin 2 of U101

Check Reset Waveform

(Pin 84 of U103)

Power Fail

U101 Fail

Check Q107, C152 , R154,

R155, R156

Check Crystal Waveform

(Pin 96,97 of U103)

U103

(TSUM16AL) Fail

Check X101,

C150, C151

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 47

7. White Screen

W hite Screen

Change LVD S Cable

Check VLCD is 3.3V?

Check Vcc3.3V ?

Check LVDS signals P an e l F a il

W orkmanshipLVDS Cable Reinsert

LVDS Cable NG

U103 Fail

Power Fail

Check Panel-Enable of

U103(pin48) is low?

Check Q101, Q105, Q106,

R113, R114, C115, C116,

C117

END

U103 Fail

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 48

8. Bad Screen

Bad Screen

LVDS Cable Reinsert

Change LVDS Cable

Check Crystal:pin96, 97 of

U103

Check the communication of

U103 and U104

Workmanship

LVDS Cable NG

Check X101, C150, C151

Check Pin 37, 38, 39,

40 of U103

Check the pins of CN104 U103 Fail

END

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 49

7. Recommended Spare Parts List

ViewSonic Model Number: VS11357 Serial No. Prefix: QAE Rev: 1a

Item ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty

1 PWRCORD 10A/250V BLACK 6FT SAA,H05W-F/3G (Australia) A-00003671 453070800420R 50

Accessories:

2 PWRCORD 5A/250V BLK 6FT UK3Gx.75mm(SP60/ (Singapore) A-00003675 453070800230R 50 3 PWRCORD 10A/250V BLK 6FT CHINA.RVV 3Gx0. A-00005255 453070800170R 50 4 PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x A-00006679 453070800250R 100 5 PWRCORD 7A/125V BLK 6FT CNS,VCTF 3Gx0.75 (Taiwan) A-00006733 453070800480R 50 6 PWRCORD 16A/250V BLK 6FT KTL,H05VV-F 3Gx (Korea) A-00006734 453070800500R 50 7 KIT,ACCESSORY,VA503B-INL(V0), LE1534 A-00006743 703000002210R 100 8 INTERFACE BOARD (V0),W/O SPK,LE1534-6E0 B-00006748 790631300610R 100

PC Board Assembly:

9 SUB BOARD,P/I BOARD(V0),W/O SPK,LE1534-6E0 B-00006749 790631400610R 100 10 KEY BOARD, LE1534 B-00006750 790631500000R 100 11 COVER,BACK,GRAY,W/O SPK, LE1534 C-00006735 501020208200R 100

Cabinets:

12 COVER,HINGE,GRAY, LE1534 C-00006736 501020208300R 100 13 ASSY,BASE,GRAY, LE1534 C-00006745 714020005900R 100 14 ASSY,BEZEL,GRAY,W/O SPK, LE1534 C-00006746 714030005900R 100 15 ASSY,BACK COVER,GRAY, LE1534 C-00006747 714050005900R 100 16 CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 CB-00005254 453010100100R 100

Cables:

17 HRN ASS'Y 8P 120mm UL2651#28,RoHS CB-00006731 430300800640R 100 18 HRN LVDS FFC 20P 208mm,RoHS CB-00006732 430302000230R 100

Electronic

Components:

20 BAG,PLASTIC,L690xW(455+145)xT0.05mm, LE1 P-00005273 506120004500R 100

Packing Material:

21 CRAFT BOX (VA503B), LE1534 P-00006737 506020010810R 100 22 GENERIC BOX P-00002513 20656 23 GENERIC FOAM SET P-00001345 31468 24 CUSHION,EPS-L, LE1534 P-00006738 506040009000R 100 25 CUSHION,EPS-R, LE1534 P-00006739 506040009010R 100 26 BAG,PLASTIC,W420xL520xT0.04mm(PRINTED) P-00006740 506120002400R 100 27 BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN P-00006741 506120002510R 100 28

Plastics:

LCD PANEL 15" MT150XN03-V0,AM15000050 E-00006742 631102050390R 0

ASSY,STAND,GRAY, LE1534 PL-00006744 714010005900R 100

Remark 1:

Above listed items are examples, supplier can expand the rows to add more necessary items.

Remark 2:

All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate repeated cross checks of each item between this version and prior versions.

RECOMMENDED SPARE PARTS LIST (VA503b-2)

Description

ViewSonic Model Number: VS11357

RECOMMENDED SPARE PARTS LIST (VA503m-2)

Serial No. Prefix: QAD Rev: 1a

Item ECR/ECN ViewSonic P/N Ref. P/N Location Universal number# Q'ty

1 PWRCORD 10A/250V BLACK 6FT SAA,H05W-F/3G (Australia) A-00003671 453070800420R 50

Accessories:

2 PWR CORD 16A/250V BLK 6FT VDE,H05VV-F 3G (Europe) A-00003674 453070800210R 50 3 PWRCORD 5A/250V BLK 6FT UK3Gx.75mm(SP60/ (Singapore) A-00003675 453070800230R 50 4 PWRCORD 10A/250V BLK 6FT CHINA.RVV 3Gx0. A-00005255 453070800170R 50 5 PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x A-00006679 453070800250R 100 6 PWRCORD 7A/125V BLK 6FT CNS,VCTF 3Gx0.75 A-00006733 453070800480R 50 7 PWRCORD 16A/250V BLK 6FT KTL,H05VV-F 3Gx (Korea) A-00006734 453070800500R 50 8 KIT,ACCESSORY,VA503M-INL(V0), LE1534 A-00008005 703000002200R 100

PC Board Assembly:

9 PCBA,KEYPAD BOARD, LE1534 B-00006750 790631500000R 100 10 PCBA,I/F BOARD(V0),W/SPK,LE1534-6E0 B-00008004 790631300600R 100 11 PCBA,P/I BOARD(V0),W/SPK, LE1534-6E0 B-00008005 790631400600R 100

Cabinets:

12 BACK COVER,BLACK, LE1534 C-00008013 714050005910R 50 13 BASE ASSEMBLY, BLACK, LE1534 C-00008014 714020005910R 100 14 FRONT PANEL, SILVER,W/SPK, LE1534 C-00008015 714030005910R 100 15 COVER,HINGE,BLACK, LE1534 C-00008016 501020208310R 100 16 Cables: CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 CB-00005254 453010100100R 100 17 HRN ASS'Y 8P 120mm UL2651#28,RoHS CB-00006731 430300800640R 100 18 HRN LVDS FFC 20P 208mm,RoHS CB-00006732 430302000230R 100 19 CABLE,AUDIO 1P 6FT BLACK/GREEN CP03B06P0 CB-00008002 453030300120R 100

Electronic

Components: LCD PANEL 15" MT150XN03-V0,AM15000050 E-00006742 631102050390R 0 Packing Material:

23 BAG,PLASTIC,L690xW(455+145)xT0.05mm, LE1 P-00005273 506120004500R 100 24 CUSHION,EPS-L, LE1534 P-00006738 506040009000R 100 25 CUSHION,EPS-R, LE1534 P-00006739 506040009010R 100 26 BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN P-00006741 506120002510R 100 27 BAG,PE+EPE,L490xW450xT0.33mm, LE1506 P-00008008 506120300410R 100 28 CARTON,VIEWSONIC(VA503M), LE1534 P-00008009 506020010800R 100 29 Plastics: ASSY,STAND,BLACK, LE1534 PL-00008003 714010005910R 100

Remark 1:

Above listed items are examples, supplier can expand the rows to add more necessary items.

Remark 2: All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR approved by ViewSonic Corporation. This is to eliminate

repeated cross checks of each item between this version and prior versions.

Description

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 50

BOM LIST (VA503b-2)

ViewSonic Model Number: VS11357 Rev: 1a

Serial No. Prefix: QAE

Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty

1 CB-00006731 430300800640R HRN ASS'Y 8P 120mm UL2651#28,RoHS 100 2 CB-00006732 430302000230R HRN LVDS FFC 20P 208mm,RoHS 100 3 CB-00005254 453010100100R CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 100 4 A-00005255 453070800170R PWRCORD 10A/250V BLK 6FT CHINA.RVV 3Gx0. 100 5 A-00006679 453070800250R PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x 100 6 A-00006733 453070800480R PWRCORD 7A/125V BLK 6FT CNS,VCTF 3Gx0.75 100 7 N/A 501010206300R BEZEL,GRAY,W/O SPK, LE1534 100 8 N/A 501010206500R BEZEL,GRAY,W/O SPK, LE1734 100

9 C-00006735 501020208200R COVER,BACK,GRAY,W/O SPK, LE1534 100 10 C-00006736 501020208300R COVER,HINGE,GRAY, LE1534 100 11 N/A 501030100700R BUTTON,FUNCTION KEY, LE1534 100 12 N/A 501240203700R BASE,GRAY, LE1534 100 13 N/A 501260202800R STAND,GRAY, LE1534 100 14 N/A 502060002400R HINGE, LE1534 100 15 N/A 502090303500R CHASSIS,W/O SPK, LE1534 100 16 N/A 502110400300R SPRING SHEET, LE1534 100 17 N/A 502170301500R PLATE,BASE, LE1534 100 18 N/A 503020002700R RUBBER,FOOT,L14.8*W9.6*T3.5mm,ROHS LE171 600 19 N/A 503040000300R RUBBER,COVER(GRAY), LE1534 400 20 N/A 505040503100R INSULATOR,PP,22x20x12X0.3mm,GLUE(3M), LE 200 21 N/A 505040503500R INSULATOR,PC,71x169x0.6mm, LE1534 100 22 P-00006737 506020010810R CARTON,VIEWSONIC(VA503B), LE1534 100 23 N/A 506030200200R CARD,AFTER SERVICE, LE1709,L130xW80 100 24 N/A 506038001420R CARDBOARD,L1120xW830xT7mm, LE1534 1.25 25 N/A 506039000900R CORNER PAPER,1900x50x50mm,LE1701 5 26 N/A 506039002500R CORNER PAPER,760x50x50mm,LE1504 5 27 P-00006738 506040009000R CUSHION,EPS-L, LE1534 100 28 P-00006739 506040009010R CUSHION,EPS-R, LE1534 100 29 N/A 506091000500R LABEL,WARRANTY, LE1709 100 30 N/A 506092001400R CARD,WARRANTY, LE1709 100 31 N/A 506102000400R LOGO PLATE,VIEWSONIC, LE1709(THREE BIRDS 100 32 P-00006740 506120002400R BAG,PLASTIC,W420xL520xT0.04mm(PRINTED) 100 33 P-00006741 506120002510R BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN 100 34 P-00005273 506120004500R BAG,PLASTIC,L690xW(455+145)xT0.05mm, LE1 100 35 N/A 506150006700R PALLET,L1128xW836xH120mm,LE1534 1.25 36 N/A 506250009400R LBL,AGENCY,VA503B, LE1534 100 37 N/A 506260001600R LABEL,WARNING, LE1X34 100 38 N/A 506380001200R TAPE,MYLAR,66000x20xT0.05 0.12 39 N/A 506380001700R TAPE,ACE,30000x20mm(PC=40x20mm),ROHS LP1 200 40 N/A 506380001800R TAPE,WRAPPING TYPE,48mmx50M ROHS LE1915 4.8 41 N/A 506390000500R LABEL,QC-PASS, LE1709 100 42 N/A 506390000600R LABEL,HI-POT PASS, LE1709 100 43 N/A 506390500100R LABEL,ENERGY STAR, LE1709 100 44 N/A 506430300002R FILM,PET,L155xW35xT0.05mm, LE1734 100 45 N/A 506431000300R FILM,PE 500mmx900M ROHS 0.05 46 N/A 506431002900R FILM,PROTECTION,UNPRINTED,330x260x0.1mm, 100 47 N/A 506440002300R LABEL,BLANK,76.2x76.2mm,LE1709(UPC) 100 48 N/A 506440002400R LABEL,BLANK,50x25mm,LE1709(S/N) 100 49 N/A 506440002600R LABEL,BLANK,210x65mm,LE1709(PALLET) 100 50 N/A 506440003000R LABEL,BLANK,35x8mm, LE1709 ROHS 200 51 N/A 506449000100R LABEL,Φ 8mm,BLACK, LE1709 20 52 HW-00005270 509000000700R BOLT,#4-40x11.8,Ni FOR D-SUB/DVI CONN.RO 200 53 N/A 509112306100R SCREW,P,CROSS,T.T-3*6,Zn 200 54 N/A 509116608100R SCREW,P,CROSS,M4*8,Zn,ROHS 400 55 HW-00005269 509146305300R SCREW,PW,CROSS,W/WAS,M3*5,NI 1,000.00 56 N/A 509212612100R SCREW,F,CROSS,T.T-4*12,Zn 300 57 N/A 511150101810R FOIL,AL.,DOUBLE COND.,60x45xT0.07mm, LE1 200 58 E-00006742 631102050390R LCD PANEL 15" MT150XN03-V0,AM15000050 100 59 N/A 631102050400R LCD PANEL 15" MT150XN03-V0,AM15000050 0 60 N/A 631102050410R LCD PANEL 15" MT150XN03-V0,AM15000050 0 61 A-00006743 703000002210R KIT,ACCESSORY,VA503B-INL(V0), LE1534 100 62 PL-00006744 714010005900R ASSY,STAND,GRAY, LE1534 100 63 C-00006745 714020005900R ASSY,BASE,GRAY, LE1534 0 64 C-00006746 714030005900R ASSY,BEZEL,GRAY,W/O SPK, LE1534 100 65 C-00006746 714030005900R ASSY,BEZEL,GRAY,W/O SPK, LE1534 0 66 C-00006747 714050005900R ASSY,BACK COVER,GRAY, LE1534 100 67 N/A 714076860000R ASSY,FINAL(G,V0/G1&2&3),W/O SPK,LE1534-6 100 68 N/A 714086860000R ASSY,PANEL(V0/G1&2&3),W/O SPK,LE1534-6E0 100 69 B-00006748 790631300610R PCBA,I/F BOARD(V0),W/O SPK,LE1534-6E0 100 70 B-00006750 790631500000R PCBA,KEYPAD BOARD, LE1534 100

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 51

BOM LIST (VA503M-2)

ViewSonic Model Number: VS11357 Rev: 1a

Serial No. Prefix: QAD

Item ViewSonic P/N Ref. P/N Description Location Universal number# Q'ty

1 B-00006750 790631500000R PCBA,KEYPAD BOARD, LE1534 100 2 B-00008005 790631400600R PCBA,P/I BOARD(V0),W/SPK, LE1534-6E0 100 3 B-00008004 790631300600R PCBA,I/F BOARD(V0),W/SPK,LE1534-6E0 100 4 N/A 714086860100R ASSY,PANEL(V0/G1&2&3),W/SPK,LE1534-6E0 100 5 N/A 714076860100R ASSY,FINAL(S,V0/G1&2&3),W/SPK,LE1534-6E0 100 6 C-00008013 714050005910R ASSY,BACK COVER,BLACK, LE1534 100 7 C-00008015 714030005910R ASSY,BEZEL,SILVER,W/SPK, LE1534 100 8 C-00008014 714020005910R ASSY,BASE,BLACK, LE1534 100

9 PL-00008003 714010005910R ASSY,STAND,BLACK, LE1534 100 10 A-00008005 703000002200R KIT,ACCESSORY,VA503M-INL(V0), LE1534 100 11 N/A 631102050410R LCD PANEL 15" MT150XN03-V0-G3,AM15000050 0 12 N/A 631102050400R LCD PANEL 15" MT150XN03-V0-G2,AM15000050 0 13 E-00006742 631102050390R LCD PANEL 15" MT150XN03-V0-G1,AM15000050 100 14 N/A 618100100020R SPEAKER 1W 16Ω 260mm,R/B/G,W/CASE,PB25K 100 15 N/A 511150101810R FOIL,AL.,DOUBLE COND.,60x45xT0.07mm, LE1 200 16 N/A 509212612100R SCREW,F,CROSS,T.T-4*12,Zn 300 17 HW-00005269 509146305300R SCREW,PW,CROSS,W/WAS,M3*5,NI 1,000.00 18 N/A 509116608100R SCREW,P,CROSS,M4*8,Zn,ROHS 400 19 N/A 509112306100R SCREW,P,CROSS,T.T-3*6,Zn 200 20 HW-00005270 509000000700R BOLT,#4-40x11.8,Ni FOR D-SUB/DVI CONN.RO 200 21 N/A 506449000100R LABEL,Φ8mm,BLACK, LE1709 20 22 N/A 506440003000R LABEL,BLANK,35x8mm, LE1709 ROHS 200 23 N/A 506440002600R LABEL,BLANK,210x65mm,LE1709(PALLET) 100 24 N/A 506440002400R LABEL,BLANK,50x25mm,LE1709(S/N) 100 25 N/A 506430300002R FILM,PET,L155xW35xT0.05mm, LE1734 100 26 N/A 506390500100R LABEL,ENERGY STAR, LE1709 100 27 N/A 506390000600R LABEL,HI-POT PASS, LE1709 100 28 N/A 506390000500R LABEL,QC-PASS, LE1709 100 29 N/A 506380001800R TAPE,WRAPPING TYPE,48mmx50M ROHS LE1915 4.8 30 N/A 506380001700R TAPE,ACE,30000x20mm(PC=40x20mm),ROHS LP1 200 31 N/A 506380001200R TAPE,MYLAR,66000x20xT0.05 0.12 32 N/A 506260001600R LABEL,WARNING, LE1X34 100 33 N/A 506250009410R LBL,AGENCY,VA503M, LE1534 100 34 N/A 506150006700R PALLET,L1128xW836xH120mm,LE1534 1.25 35 P-00008008 506120300410R BAG,PE+EPE,L490xW450xT0.33mm, LE1506 100 36 P-00005273 506120004500R BAG,PLASTIC,L690xW(455+145)xT0.05mm, LE1 100 37 P-00006741 506120002510R BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN 100 38 N/A 506102000400R LOGO PLATE,VIEWSONIC, LE1709(THREE BIRDS 100 39 N/A 506092001400R CARD,WARRANTY, LE1709 100 40 N/A 506091000500R LABEL,WARRANTY, LE1709 100 41 P-00006739 506040009010R CUSHION,EPS-R, LE1534 100 42 P-00006738 506040009000R CUSHION,EPS-L, LE1534 100 43 N/A 506039002500R CORNER PAPER,760x50x50mm,LE1504 5 44 N/A 506039000900R CORNER PAPER,1900x50x50mm,LE1701 5 45 N/A 506038001420R CARDBOARD,L1120xW830xT7mm, LE1534 1.25 46 N/A 506030200200R CARD,AFTER SERVICE, LE1709,L130xW80 100 47 P-00008009 506020010800R CARTON,VIEWSONIC(VA503M), LE1534 100 48 N/A 505040503500R INSULATOR,PC,71x169x0.6mm, LE1534 100 49 N/A 505040503100R INSULATOR,PP,22x20x12X0.3mm,GLUE(3M), LE 200 50 N/A 503040000310R RUBBER,COVER(B), LE1534 400 51 N/A 503020002700R RUBBER,FOOT,L14.8*W9.6*T3.5mm,ROHS LE171 600 52 N/A 502170301500R PLATE,BASE, LE1534 100 53 N/A 502110400300R SPRING SHEET, LE1534 100 54 N/A 502090303510R CHASSIS,W/SPK, LE1534 100 55 N/A 502060002400R HINGE, LE1534 100 56 N/A 501260202810R STAND,BLACK, LE1534 100 57 N/A 501240203710R BASE,BLACK, LE1534 100 58 N/A 501030100700R BUTTON,FUNCTION KEY, LE1534 100 59 C-00008016 501020208310R COVER,HINGE,BLACK, LE1534 100 60 N/A 501020208210R COVER,BACK,BLACK,W/SPK, LE1534 100 61 N/A 501010206510R BEZEL,SILVER,W/SPK, LE1734 100 62 N/A 501010206310R BEZEL,SILVER,W/SPK, LE1534 100 63 A-00006733 453070800480R PWRCORD 7A/125V BLK 6FT CNS,VCTF 3Gx0.75 100 64 A-00006679 453070800250R PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 18x 100 65 A-00003674 453070800210R PWR CORD 16A/250V BLK 6FT VDE,H05VV-F 3G 100 66 A-00005255 453070800170R PWRCORD 10A/250V BLK 6FT CHINA.RVV 3Gx0. 100 67 CB-00008002 453030300120R CABLE,AUDIO 1P 6FT BLACK/GREEN CP03B06P0 100 68 CB-00005254 453010100100R CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 100 69 CB-00006732 430302000230R HRN LVDS FFC 20P 208mm,RoHS 100 70 CB-00006731 430300800640R HRN ASS'Y 8P 120mm UL2651#28,RoHS 100

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 52

8. Exploded Diagrams and Exploded Parts List (VA503m)

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 53

Exploded Diagrams and Exploded Parts List (VA503b)

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 54

ViewSonic Model Number: VS11357 Rev: 1a

Serial No. Prefix: QAD

Item ViewSonic P/N Ref. P/N Description Q'ty

1 C-00008015 714030005910R ASSY,BEZEL FRONT, LE1534 1 2 C-00008014 714020005910R ASSY,BASE, LE1534 1 3 PL-00008003 714010005910R ASSY,STAND, LE1534 1 4 N/A 502090303510R CHASSIS,W/ SPEAKER,LE1534 ROHS 1 5 B-00008005 790631400600R PCBA MAIN BOARD LE1534 ROHS 1 6 B-00008004 790631300600R INTERFACE BOARD LE1534 ROHS 1 7 N/A 631102050400R LCD PANEL 15'' MT150XN03V0 INL 1 8 N/A 501020208210R COVER,BACK,REAR ,LE1534 1

9 N/A 618100100020R SPEAKER R/L ,LE1534 2 10 C-00008016 501020208310R COVER,HINGE LE1534 1 11 N/A 503040000310R VESA RUBBER COVER(B) 4 12 B-00006750 790631500000R FUNCTION KEY BOARD 1 13 CB-00006732 430302000230R HRN LVDS FFC ,ROHS 1 14 N/A 501030100700R FUNCTION KEY 1 15 N/A 506380001700R TAPE,ACE (20*40) 2

A N/A 509916305300R SCREW,PW,M3*5,Zn-BKT 10 B N/A 509112306100R SCREW,P,T3*6mm,Zn-BLACK 4 C HW-00005266 509212610300R SCREW,F,CROSS,T4*10,Ni 6 D HW-00005270 509000000700R BOLT,#4-40x11.8,Ni 2 E N/A 509116608100R Screw,P Cross,M4*8mm,Zn 6

EXPLODED PARTS LIST (VA503m-2)

EXPLODED PARTS LIST (VA503b-2)

ViewSonic Model Number: VS11357 Rev: 1a

Serial No. Prefix: QAE

Item ViewSonic P/N Ref. P/N Description Q'ty

1 C-00006746 714030005900R ASSY,BEZEL FRONT, LE1534 1 2 C-00006745 714020005900R ASSY,BASE, LE1534 1 3 PL-00006744 714010005900R ASSY,STAND, LE1534 1 4 N/A 502090303500R CHASSIS,W/O Speaker,LE1534 ROHS 1 5 B-00006749 790631400610R PCBA MAIN BOARD LE1534 ROHS 1 6 B-00006748 790631300610R INTERFACE BOARD LE1534 ROHS 1 7 N/A 631102050400R LCD PANEL 15'' MT150XN03V0 INL 1 8 C-00006735 501020208200R COVER,BACK,REAR ,LE1534 1

9 C-00008016 501020208310R COVER,HINGE LE1534 1 10 N/A 503040000300R VESA RUBBER COVER 4 11 B-00006750 790631500000R FUNCTION KEY BOARD 1 12 CB-00006732 430302000230R HRN LVDS FFC ,ROHS 1 13 N/A 501030100700R FUNCTION KEY 1 14 N/A 506380001700R TAPE,ACE (20*40) 2

A N/A 509916305300R SCREW,PW,M3*5,Zn-BKT 10 B N/A 509112306100R SCREW,P,T3*6mm,Zn-BLACK 4 C HW-00005266 509212610300R SCREW,F,CROSS,T4*10,Ni 6 D HW-00005270 509000000700R BOLT,#4-40x11.8,Ni 2

E N/A 509116608100R Screw,P Cross,M4*8mm,Zn 6

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 55

VA503m-3

PACKING PART LIST (VA503m-2 )

ViewSonic Model Number: VS11357 Rev: 1a

Item ViewSonic P/N Ref. P/N Location Q'ty

1 N/A 506431000300R FILM,PE 500mmx900M ROHS 1/64 2 N/A 506039000900R CORNER PAPER,1900x50x50mm ROHS 4/80 3 N/A 506039002500R CORNER PAPER,760x50x50mm ROHS 4/80 4 P-00006739 506040009010R CUSHION,EPS-R, LE1534 1 5 CB-00008002 453030300120R CABLE,AUDIO 1P 6FT BLACK/GREEN CP03B06P0 1 6 CB-00005254 453010100100R CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 1 7 A-00008005 703000002200R KIT,SERVICE PACK,VA503M-INL(V0),LE1534 1 8 P-00006741 506120002510R BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN 1

9 C-00008014 714020005910R ASSY,BASE,BLACK, LE1534 1 10 A-00006733 453070800480R PWR CORD,7A/125V,BLK 6FT CNS,VCTF 3Gx0.75 1 11 P-00006738 506040009000R CUSHION,EPS-L, LE1534 1 12 P-00008008 506120300410R BAG,PE+EPE,L490xW450xT0.33mm, LE1506 1 13 P-00008009 506020010800R CARTON,VIEWSONIC(VA503M), LE1534 1 14 N/A 506440002300R CARTON LABEL,LE1709 1 15 N/A 506038001420R CARDBOARD,L1120xW830xT7mm, LE1534 1 16 N/A 506150006700R PALLET,L1128xW836xH120mm,LE1534 1

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 56

VA503b-3

PACKING PART LIST (VA503b-2 )

ViewSonic Model Number: VS11357 Rev: 1a

Item ViewSonic P/N Ref. P/N Location Q'ty

1 N/A 506431000300R FILM,PE 500mmx900M ROHS 1/64 2 N/A 506039000900R CORNER PAPER,1900x50x50mm ROHS 4/80 3 N/A 506039002500R CORNER PAPER,760x50x50mm ROHS 4/80 4 P-00006739 506040009010R CUSHION,EPS-R, LE1534 1 5 CB-00005254 453010100100R CABLE,D-SUB 15P MALE 6FT BLACK/BLUE,SZ40 1 6 A-00006743 703000002210R KIT,SERVICE PACK,VA503B-INL(V0),LE1534 1 7 P-00006741 506120002510R BAG,PLASTIC,W220xL280xT0.05mm,CYCLE PRIN 1 8 C-00006745 714020005900R ASSY,BASE,GRAY, LE1534 1

9 A-00006733 453070800480R PWR CORD,7A/125V,BLK 6FT CNS,VCTF 3Gx0.75 1 10 P-00006738 506040009000R CUSHION,EPS-L, LE1534 1 11 P-00008008 506120300410R BAG,PE+EPE,L490xW450xT0.33mm, LE1506 1 12 P-00006737 506020010810R CARTON,VIEWSONIC(VA503B), LE1534 1 13 N/A 506440002300R CARTON LABEL,LE1709 1 14 N/A 506038001420R CARDBOARD,L1120xW830xT7mm, LE1534 1 15 N/A 506150006700R PALLET,L1128xW836xH120mm,LE1534 1

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 57

9. Block Diagram

AC Input 90V-240V

Lamp2

AC Socket

AP9971

Protection

Open

AC Line Filter

OPP/OCP

TOP245Y

Filter Circuit

OZ9938G

On/Off

Brightness

Rectifier &

LTV817

Transformer

Power

Feedback

OVP

Lamp1

MT150XN03 V0(Innolux)

TFT LCD Panel 15"

Filter Circuit

Rectifier &

VA503b/m Block Diagram

14V

3.3V

Power

Connector

Keyboard

Audio In

Keypad

14.318MHz XTAL

Phone

Jack

TDA7496L

TSUM16AL

24C04

3.3 V

Note: the parts in dashed line are for VA503m only.

Brightness

On/Off

Panel Enable

Connector

Speaker

VGA Connector

VGA Input

flash

3.3V-1.8V LDO

AP2305GN

PMBT3906

Panel Interface

24C02

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 58

10. Schematic Diagrams

CN102 8P 2.0mm

1 2 3 4 5 6 7 8

+3.3V

GND ON/OFF BRIGHTNESS GND VOLUME MUTE

FB101 600Ω 2A

VCC3.3 VCC1.8

R104 4K7

VCC3.3 3,4 VCC1.8 4

ON/OFF

DIMMER 4

VOL 4 MUTE 4

VCC3.3

C102

100u/16V

U101 LD1117AL-1.8V

VIN

VOUT

C103

0.1/50V

ADJ

C104 100u/16V

C105

0.1/50V

CN101

From Keypad

2x4P 2.0mm

8 7 6 5 4 3 2 1

UP DOWN POWER AUTO MENU GND LED_G

C109 0.1/50V

C110 0.1/50V

C106

0.1/50V

C112 0.1/50V

C111 0.1/50V

C107 1u/16V/NC

C113 0.1/50V

C114 0.01/50V

R105 1K R106 1K R107 1K R108 1K R110 1K

R111 100 R112 220

C101 0.01/50V

KEY_UP 4 KEY_DOWN 4 KEY_POWER 4 KEY_AUTO 4 KEY_MENU 4

GREEN ORANGELED_O

GREEN

ORANGE

Q103

PMBT3906

Q104 PMBT3906

VCC3.3

R101 4K7

VCC3.3

R109 4K7

LED_GREEN 4

LED_ORANGE 4

ON/OFF

20K R113

Q105

AP2305GN

R152

Q106

PMBT3906

Q101 2N7002

C116

100u/16V

VLCD

C117

0.1/50V

VLCD 4

AP2305N, 2N7002, PMBT3906, PMBT3904 pins define

VCC3.3

C115

1u/16V

R114

4K7

PANEL_ENABLE4

R115 4K7

R102 4K7

Q102

PMBT3904

R103 10K

VCC3.3

CCFL_ENABLE 4

ViewSonic Corporation

Model

Title

Date Rev:

DC to DC

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 59

CN103 DZ11AA1-H5W6-4F

1 6 2 7 3 8 4 9 5 10

PC5V VGA_CON

R120 75 1%

R121 75 1%

R122 75 1%

FB107 60Ω

FB108 60Ω

FB109 60Ω

R116 56

R117 56

R118 56

R119 470/NC

R123 100

R124 100

R125 100

C118 0.047/25V

C119 0.047/25V

C120 0.047/25V

C121 0.047/25V/NC

C122 0.047/25V

C123 0.047/25V

C124 0.047/25V

RIN 4

GIN 4

BIN 4

SOG 4

GNDR 4

GNDG 4

GNDB 4

VSI

HSI

CLK_DDC DAT_DDC

ZD103 5V6/NC

ZD102

5V6/NC

ZD104 5V6/NC

VCC3.3

PC5V

R134 100 R135 100

R138 100

D105 BAV70

R132 4K7

D102

BAV99/NC

R133 4K7

D103

BAV99/NC

U102 AT24C02BN

VCC

SCL

D104

R126 1K

C153

0.01u/50V/NC

VCC3.3

R128 100

R129 100

R130 2K2

R127 4K7

C125 220p/50V

R131 2K2

C126 33p/50V

D101

BAV99/NC

GNDSDA

DET_VGA 4

VCC3.3 2,4

VSYNC 4

HSYNC 4

ZD105 5V6/NC

ZD101 5V6/NC

WP 4 DDCA_SDA 4 DDCA_SCL 4

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

C127 0.1/50V

ViewSonic Corporation

Model

Title

Date Rev:

INPUT

Page 60

VDDCVMPLL VPLLVADC

668234

VDDC

XOUT

VDDC

C128 1u/16V

REFP

GPIO_P16/PWM2

PWM0/GPIO_P26

GPIO_P02/SAR3 GPIO_P01/SAR2 GPIO_P00/SAR1

PWM1/GPIO_P25

GPIO_P27/PWM1

GPIO_P11/I2C_MDA

GPIO_P10/I2C_MCL

GPIO_P22

RP101

GPIO_P14 GPIO_P13

GPIO_P07 GPIO_P06

RSTN

GPIO_P12

LVB0M

LVB0P

LVB1M

LVB1P

LVB2M

LVB2P LVBCKM LVBCKP

LVB3M

LVB3P

LVA0M

LVA0P

LVA1M

LVA1P

LVA2M

LVA2P

LVACKM LVACKP

LVA3M

LVA3P

PWM2/GPIO_P24

R153 0/NC

4K7x4

REFM

99 95 94 93 92 91 90 89 88

86 85

78 77 74 73 72 71 70 69 68 67

65 64

63 62

61 60

59 58

55 54

VLCD

R151 4K7/NC

C141

0.1/50V

VCC3.3

VADC

DDCA_SDA3 DDCA_SCL3 DET_VGA3

VCC3.3

R156 8K2

R154 4K7

R140 390 1%

GNDB3 BIN3 GNDG3 GIN3 SOG3 GNDR3 RIN3 HSYNC3 VSYNC3

U104

VCC

HOLD#

WP#

4 5

GND SI

SST25VF010A

R155 220

C152

10u/25V

CS#

SCK

Q107 PMBT3904

VDDP

REXT

BIN0N

BIN0P

GIN0N

GIN0P

SOGIN0

RIN0N

RIN0P

HSYNC0

VSYNC0

DDCA_SDA/RS232_TX

DDCA_SCL/rs232_RX

GPIO_P15/PWM0

GPIO_P23

VCTRL

2 1 6

38 39 40

100

SDO SCZ SCK SDI

DDCD_SCL DDCD_SDA

RST

GND

112933

GND

AVDD_ADC

GND

5057767983

AVDD_MPLL

GND

163249

AVDD_PLL

TSUM16AL

MODE[1]

MODE[0]

VDDP

XIN

BYPASS

NCNCNC

8087364546

X101

14.318MHz

RP102

4K7x4

VCC3.3

RXE0RXE0+

RXE1RXE1+

RXE2RXE2+

RXECRXEC+

RXE3RXE3+

VCC3.3

VCC3.32,3

R137 10K

R139 4K7

R136 10K

KEY_DOWN 2 KEY_UP 2

R141 100

R142 100

R144 4K7

CN104 HS8920E

20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

KEY_AUTO 2 VOL 2 LED_ORANGE 2 LED_GREEN 2 KEY_POWER 2 KEY_MENU 2 MUTE 2

DIMMER 2 CCFL_ENABLE 2

VCC1.82

VCC1.8

VCC3.3

FB106

600Ω

FB105

600Ω

C136

22u/16V

FB103 600Ω

C129

22u/16V

FB104 600Ω

C142 22u/16V

22u/16V

C133

0.1/50V

C144

C137 0.1/50V

C130 0.1/50V

0.1/50V

C145

C138 0.1/50V

C131 0.1/50V

0.1/50V

C134

C146 0.1/50V

C139 0.1/50V

VADC

0.1/50V

C132

VPLLVMPLL

C135 0.1/50V

VDDC

0.1/50V

C147

VDDP

C140 0.1/50V

VCC3.3

817263

RP103 4K7x4

WP MDA MCL PANEL_ENABLE

R146 4K7

R147 4K7

C148 0.1/50V

C150 18p/50V

C151 18p/50V

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

R143

R149 100 R150 100

PANEL_ENABLE 2

VCC3.3

8 7 6

C149 0.1/50V

VCC WP SCL

U105 AT24C04N

GNDSDA

ViewSonic Corporation

Model

Title

Date Rev:

SCALER

Page 61

LED901 LED G/Y

321

SW905

1324

TACT-4.3

SW904

1324

SW_TACT

SW903

1324

SW_TACT

AUTO UPMENU DOWNPOWER

SW902

1324

SW_TACT

SW901

1324

SW_TACT

LED_O LED_G GND MENU AUTO POWER DOWN UP

1 2 3 4 5 6 7 8

CN901 8P R/A 2.0mm

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

ViewSonic Corporation

Model

Title

Date Rev:

KEYPAD

Page 62

D801 BL4-06

L801 12mH

R821

C804

0.47/275V

C801

2200p/250V

F801 2A/250V

1 2 3

P801

AC_SKT

R820 1M

RT801

NTC 5R

C806

2200p/250V

C805

82u/450V

C813

47p/1KV

PGND

R801

2M4

R805 2M4

R822 2M4

R823

2M4

R803 510K

510K R807

R824 510K

R825 470K

IC802 TOP245YN

R817

8K2 1%

ZD802

P6KE200A-LF

ZD805 12V

3300p/400V

0.1/50V

C824

C817

C820 2200p/400V

R804 68

C803

4700p/1KV

D804

MUR1100ERL

D806 A02-LF

C815 47u/25V

R812 6R8

R816 6R8

C818

47u/25V

T801 SPW-065

IC801 LTV817M

CN801 90mm 8P

Q801

NC/PMBT3904

1 2 3 4 5 6 7 8

R802 10

D803 SRF10100C

R806 10

D805

SRF1040CM

1N4148

C821

0.1/50V

C802

1000p/500V

C812

1000u/10V

D809

VCC3.3V

ON/OFF BRIGHTNESS

VOL MUTE

C811

R808 10K

C819

47u/25V

C808

680u/25V

L802 5uH

L803 5uH

C814 47u/25V

R809 100 1%

R814 1K

C816

0.1/100V

IC803 TL431

R811 1K6 1%

R815 1K

C810 220u/25V

R818 3K3 1%

C822

0.1/50V

ZD801

12V

B801

Bead_Jumper

R827 10K

R810

51K 1%

+14V 3,4

R828 100 1W

R829 200

ZD803 NC/3V9

R813

NC/1K

R819 NC/10K

2SC1815

Q802

VCC3.3V

ZD804 NC/16V

C823 NC/0.1/50V

ViewSonic Corporation

Model

Title

POWER SUPPLY

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Date Rev:

Page 63

+14V

R503 1K5

ZD501 5V6

R511 NC

R512 33K 1%

BRIGHTNESS3

R514

22K 1%

C510 1000p/50V

C515

2.2u/25V

R513

10K 1%

R509 NC

R515 NC

R502 680

Q501 PMBT3904

C503

0.1/50V

C507

2.2u/25V

DRV1

VDDA

TIMER

DIM

ISSEN

VSEN

OVPT

8 9

NC NC

IC501 OZ9938G

SSTCMP

PGND

DRV2

GNDA

LCT

ENA

R526 10

C516 1000p/50V

R507

3M3 1%

R525

R516

604K 1%

R508

51K 1%

C511

0.047/25V

C501

220u/25V

U501 AP9971GM

C512

330p/50V

C502

2.2u/25V

1000p/50V

C521 NC

R504 33

C504

R505 33

R506

C505

1000p/50V

T501

C508

SPW-066

C509 5p/3KV

C513

6800p/50V

C506

10p/3KV

C514

3M 3KV

R520 3K9 1%

R510

3K9 1%

D503

BAV99

R524 470

D502 BAV99

R523 470

CN501

4200-D208

CN502 4200-D208

D504 BAV99

D501

ON/OFF3

R501 10K 1%

R518

C518

0.01/50V

C520

0.01/50V

R521 1M

R522 10K 1%

D505 SN4148

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

C519

0.01/50V

R519 1M

C517

0.033/50V

R517

330 1%

ViewSonic Corporation

Model

Title

Date Rev:

INVERTER

Page 64

Layout guide :

1. Tie the I.C. pin 1,2,3,18,19,20 to ground with a large copper pour (open mask layer)

P701 AUDIO IN

+14V

R708 27K

2 3 4 5 1

R706 47K

R715 27K

Line_L

Line_R

R704

10K

PMBT3904

R702 10K

R703 10K

Q703

C704

0.47/16V

C706

0.47/16V

+14V

+14V 2,3

C703

0.1/50V

U701

INL

INR

MUTE

STBY

VOLUME

GND

12313181920

GND

VAROUT_R

VAROUT_L

GND

OUTR

GND

OUTL

SVR

GND

TDA7496L

C702

470u/25V

C701 220u/16V

C709 0.1/50V

R709 1K

R710 1K

C705 470u/16V

C707 470u/16V

CN701 4P R/A 2.0mm

4 3 2 1

MUTE2

+14V

VOL2

R713 5K6

R714 100

Q701

PMBT3904

R711 2K

C711 4700p/50V

R707 5K6

Q702 PMBT3904

R7122KC712 4700p/50V

R701 5K1

C713 10u/25V

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

ViewSonic Corporation

Model

Title

Date Rev:

TDA7496L

Page 65

11. PCB Layout Diagrams

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 66

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 67

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

Page 68

* Reader’s Response*

Dear Readers:

Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation.

Assessment

A. What do you think about the content of this Service Manual?

Unit Excellent Good Fair Bad

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 Exploded Parts List

9. Block Diagrams

10. Schematic Diagrams

11.PCB Layout Diagrams

B. Are you satisfied with this Service Manual?

Item Excellent Good Fair Bad

1. Service Manual Content

2. Service Manual Layout

3. The form and listing

C. Do you have any other opinions or suggestions regarding this service manual?

Name:

Reader’s basic dada:

Title: Company: Add: Tel:

Fax:

E-mail:

After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes (marc.maupin@viewsonic.com)

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2