ViewSonic VA903b-3, VA903m-3 Service manual

Service Manual

ViewSonic VA903b-3

VA903m-3

Model No. VS11372

19” Color TFT LCD Display

(VA903b-1_ VA903m-1_SM Rev.

1a Sep. 2006)

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

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 09/08/2006 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 13

4. Circuit Description 16

5. Adjustment Procedure 23

6. Troubleshooting Flow Chart 47

7. Recommended Spare Parts List 55

8. Exploded Diagram and Exploded Parts List 60

9. Block Diagram 65

10. Schematic Diagrams 66

11. PCB Layout Diagrams 72

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1. Precautions and Safety Notices

1. Please carefully read this manual before operating the device and keep it available for future reference.

2. To avoid the danger of the monitor falling and thereby possibly causing injury and/or serious damage to the

monitor itself, do not place it on unstable cars or desks. Be careful to avoid placing any stress on the LCD screen

during handling.

3. Do not place this monitor in areas that are wet or where water or other liquids may come in contact with it, such as

bathrooms, kitchens, wet floors, near washing machines or by swimming pools.

4. Remove the power plug from the electrical socket before cleaning. No water-containing cleaning agent should be

used to clean the screen, but only cleaning agents formulated specifically for cleaning LCD screens. Do not put any

liquid cleaning agent directly on the screen, but put it on a soft cloth first and then gently apply the cloth to the

screen.

5. In order to guarantee reliable operation and adequate heat dissipation, do not cover or block vent holes on the

monitor. Do not put the monitor close to heat sources. Do not place the monitor on furniture such as a bookshelf,

unless sufficient ventilation is available.

6. A 3-pin grounding plug is provided for this monitor. In order to guarantee normal operation and safety of this unit,

this plug should be used with a matching grounded power socket.

7. Please follow all warnings and instructions that accompany the monitor.

8. Please pay special attention to power supply overloads, as electrical shock or fire may occur.

9. Do not place anything on the power cord. Do not hang the power cord over an area where people or objects may

pass.

10. In case the monitor is not be used for an extended period, turn off power to avoid the possibility of short circuits

caused by lightning.

11. In order to avoid electrical shock or fire risks, do not insert any object through any openings in the monitor’s

enclosure. Do not allow any liquid to come in contact with the monitor.

12. In case of any abnormal noise or odor caused by incorrect operation, turn off power immediately and contact a

professional technician. Do not attempt to repair this monitor by yourself, as electrical shock may occur when

opening the back cover or accessing internal components.

13. If any of the following conditions occurs, turn off power and contact a repair service provider:

1) the power cord is damaged or worn;

2) liquid has gotten into the monitor, or the monitor has experienced immersion or wetting;

3) the monitor has fallen;

4) the monitor’s performance shows obvious changes;

5) the monitor fails to work normally when correct procedures are followed. In that case, please make any

adjustments in accordance with instructions supplied with the monitor; do not attempt any changes to

established procedures, as further damage may occur, making successful repair of the monitor more difficult.

14. In case parts need to be replaced, you must use identical parts or those supplied by our certified manufacturers. Any

other parts used without our authorization may result in electrical shock or fire risk.

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Handing and Placing methods

Correct methods Incorrect methods

Only touch the metal frame of the LCD panel or the

front cover of the monitor, DO not touch the surface

of the POL

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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Place the monitor on a clean and soft foam pad Placing the monitor on a foreign objects, that could

scratch The surface of the "Panel" or cause "mura"

The panel is placed facedown the lap,that may cause

"mura"

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2. Specification

INTRODUCTION

FEATURES VA903b-3 / VA903m-3

Size 19 “

Luminance (Typ)

Contrast Ratio (Typ) 700 :1

1st TFT LCD panel

Input Signal

Sync Compatibility

Compatibility

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

Colors 16.2 M colors (6+2bit panel)

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 135 °

Recommend resolution 1280 x 1024 @60Hz

Analog (75ohms, 1.0 Vp-p) Yes

Digital (DVI-D) No

Separate Sync Yes

Composite Sync No

Sync on Green No

PC Yes

Power Mac Yes

TV Box (NextVision 6) Yes

On Mode(Max / Typ) Under 36 W in max/32W IN TYP

300 cd/㎡

Power Consumption

Active Off Mode (Max)

Tilt ( -5 ° - 22.5 °)

Swivel No

Ergonomics

Pivot No

Height Adjust No

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

Physical (W x H x D) 416*429*210mm

Dimension

Package (W x H x D) 485*503*163mm

Physical (Net Weight) 4.6Kg / 10.12 lb

Weight

Package (Gross Weight) 5.8Kg/ 12.76 lb

Temperature (℉/℃) 32℉~104℉ / 0℃~40℃

Operating Condition

Humidity (%) 20 % - 90 %

Temperature (℉/℃) -4℉~140℉ / -20℃~60℃

Storage Condition

Humidity (%) 5 % - 90 %

Saving mode< 2W

Off mode <1 W

Yes

UL/cUL, FCC-B,TUV-S, CB, CE, TUV/GS, TUV/ERGO, TCO03, BSMI,

Regulation

CCC, (PSB), (C-TICK), GOST-R/HYGIENIC, SASO, WEEE, RoHS,

ENERGY STAR,

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Product definition and specification

Product Name VA903b-3 / VA903m-3

Model Number VS11372

M model for America

E model for Europe

G model for China

Region

OSD Languages

TFT LCD Panel and Model # HSD, Model # :190ME13-A16/A10

Scalar RTD, Model # : RTD2023L

Input Signal Analog

Sync Compatibility Separate

Audio

Adapter No

Power Cable Refer to Appendix D

Analog Cable (1.8 m, color : black), with PC 2001 and

Hot Plug Detect &DDC

P model for Asia

A model for Australia

S model for Singapore

K model for Korea

U model for UK

English, French, German, Italian, Spanish,

Finnish, Japanese, Traditional Chinese,

Simplified Chinese

1 W @ < 15% distortion (For VA903m-3 only)

Yes

Audio Cable (1.8m, Color: black) with PC 2001 Yes (For VA903m-3 only)

ViewSonic CD Wizard

ViewSonic Quick Start Guide

Screen Protector Mylar Yes

Hi Pot label Yes

QA pass label For G model only

Hg Warning label Yes

Warranty Sticker For G model only

Warranty Card For G model only

Carton Sticker For G model only

PE bag of Carton For G model only

Arabic, English, Finnish, Spanish, German,

Italian, Swedish, Polish, Korean, Portuguese,

Russian, French, Simplified Chinese,

Traditional Chinese, Hungary, Czech, Turkish

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GENERAL specification

Test Resolution & Frequency 1280 x 1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls

Factory Default:

Contrast = 70%, Brightness = 100%

VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A

Default Input Connector Defaults to the first detected input

Equal to twice the weight of the monitor for five

Video Cable Strain Relief

minutes

Video Cable Connector DB-15 Pin out Compliant DDC 2B

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

Sync Signals TTL

DDC 2B Compliant with Revision 1.3

Sync Compatibility Separate Sync

Video Compatibility

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

Resolution Compatibility

600, 832 x 624, 1024 x 768, 1152 x 864, 1280 x 1024

Exclusions Not compatible with interlaced video

POWER SUPPLY

Internal Power Supply Part Number: PI-SB03/

Input Voltage Range

Input Frequency Range

Short Circuit Protection

Over Current Protection

Leakage Current

Efficiency

Fuse

Power Dissipation

Max Input AC Current

Inrush Current (Cold Start)

100 - 240VA C

50/ 60 Hertz

OUTPUT CAN BE SHORTED WITHOUT DAMAGE

6.0 A TYPICAL AT 5.0 VDC

1.0 MA (MAX) AT 264 VAC / 60HZ

80 % TYPICAL AT 115 VAC FULL LOAD

INTERNAL AND NOT USER REPLACEABLE

32 WATTS (TYP)

1.2 ARMS @ 90VAC, 0.8 ARMS @180VAC

30 A @ 90VAC, 60 A(MAX) @ 264 VA C

SHALL START AND FUNCTION PROPERLY WHEN

Power Supply Cold Start

UNDER FULL LOAD, WITH ALL COMBINATIONS OF INPUT VOLTAGE, INPUT FREQUENCY, AND OPERATING TEMPERATURE

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Power Supply Transient Immunity

Power Supply Line Surge Immunity

SHALL BE ABLE TO WITHSTAND AN ANSI/IEEE C62.41-1980 6000V 200 AMPERE RING WAVE TRANSIENT TEST WITH NO DAMAGE

Shall be able to withstand 1.5 times nominal line

voltage for one cycle with no damage

Shall be able to function properly, without reset or

Power Supply Missing Cycle Immunity

Power Supply Acoustics

US Type Power Cable

Power Saving Operation (Method) VESA DPMS Signaling

Power Consumption

Recovery Time On Mode = N/A, Active Off < 3 sec

ELECTRICAL REQUIREMENTS

Horizontal / Vertical Frequency

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. 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

Length = 1.8m. Connects to AC/DC Power Color =

Black

ON Mode < 36 W (max)

pOWER sAVING < 2W ,OFF < 1W

Horizontal Frequency

Vertical Refresh Rate

Maximum Pixel Clock 135 MHz

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog

1 640 x 350 @ 70Hz, 31.5kHz Yes

2 640 x 480 @ 50Hz, 24.68KHZ Yes

3 640 x 480 @ 60Hz, 31.5kHz Yes

4 MAC 640 x 480 @ 67Hz, 35.0kHz Yes

5 640 x 480 @ 72Hz, 37.9kHz Yes

6 640 x 480 @ 75Hz, 37.5kHz Yes

7 640 x 480 @ 85Hz, 43.27kHz Yes

8 720 x 400 @ 70Hz, 31.5kHz Yes

9 800 x 600 @ 56Hz, 35.1kHz Yes

30 – 82 kHz

50 – 85 Hz.

10 800 x 600 @ 60Hz, 37.9kHz Yes

11 800 x 600 @ 72Hz, 48.1kHz Yes

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12 800 x 600 @ 75Hz, 46.9kHz Yes

13 800 x 600 @ 85Hz, 53.7kHz Yes

14 MAC 832 x 624 @ 75Hz, 49.7kHz Yes

15 1024 x 768 @ 60Hz, 48.4kHz Yes

16 1024 x 768 @ 70Hz, 56.5kHz Yes

17 1024 x 768 @ 72Hz, 58.1kHz Yes

18 1024 x 768 @ 75Hz, 60.0kHz Yes

19 1024 x 768 @ 85Hz, 68.67KHZ Yes

20 1152 x 864 @ 75Hz, 67.5KHZ Yes

21 MAC 1152x870@75HZ, 68.68KHZ Yes

22 1280 x 960 @ 60Hz, 44.93KHZ Yes

23 1280 x 960 @75Hz, 56.25KHZ Yes

24 1280 x 1024 @ 60Hz, 63.98KHZ Yes

25 1280 x 1024 @ 75Hz, 79.97KHZ Yes

*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 1280 x 1024 @ 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 Adjust”

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

● The monitor needs to do “Auto Adjust” the first time a new mode is detected (See section “0-Touch™ Function Actions”)

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AUDIO INTERFACE (SPEAKER SPECIFICATION) (For VA903m-3 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 @ <15% DISTORTION

Signal to Noise Ratio 50 dB

Frequency response 200 Hz – 20 Khz

Distortion

<15% THD (@1kHz)

There should be no audible vibration with volume at

Vibration

100%. (Input signal within 1.0 Vrms)

There should be no affect on the screen image

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 1st Panel Source

Type

HSD 190ME13-A16/A10

TN, LVDS

Active Size 376.32 mm (H) x 301.056mm (V)

Pixel Arrangement RGB Vertical Stripe

Pixel Pitch 0.294 mm

Glass Treatment

# of Backlights

Backlight Life

Luminance –Condition: CT = 6500 K

Contrast = Max, Brightness = Max

ANTI GLARE (HARD COATING 3H)

4 CCFL EDGE-LIGHT

50,000 HOURS (MAX) / 40,000 HOURS (MIN)

300 CD/M2 (TYP AFTER 30 MINUTE WARM UP) 240 CD/M2 (MIN AFTER 30 MINUTE WARM UP)

Brightness Uniformity 75 % (min)

Contrast Ratio 700 :1 (Typ), 450 :1 (Min)

Color Depth Vertical) 16.2 million colors (6+2 bit panel)

150 deg (Typ)@ CR>10

Viewing Angle (Horizontal)

160 deg (Typ)@ CR>5

135 deg (Typ) @ CR>10

Viewing Angle (Vertical)

150 deg (Typ)@ CR>5

Response Time

10%-90% @ Ta=25°C

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

12 ms (Tr= 4 ms, Tf = 8 ms) (max)

Panel Defects Please see Panel Quality Specifications.

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IMAGE PERFORMANCE Display Size

Horizontal Display Size, Primary Preset

Vertical Display Size, Primary Preset

Luminance

Lv (Max) –Condition:

Brightness / Contrast = 100%

CCT = USER COLOR (R/G/B=100%)

Lv (6500Kf) –Condition:

Brightness / Contrast = Default

Color Temperature = 6500K

Lv (sRGB) –Condition:

Brightness / Contrast = Default

CCT =sRGB

Lv (9300K) –Condition:

Brightness / Contrast = Default

CCT = 9300K

FULL SCREEN

Lv (Max) = The Luminance requirement of section 4-6

“TFT LCD PANEL”

Lv (6500K) / Lv (Max) x 100% ≧ 85%

Lv (sRGB) / Lv (Max) x 100% ≧85%

Lv (9300K) / Lv (Max) x 100% > 70%

Lv (5400K) –Condition:

Brightness / Contrast = Default

CCT = 5400K

Lv (Brightness) –Condition:

Contrast = 100%

Lv (Contrast) –Condition:

Brightness = 100%

Contrast Ratio

CR(Max) –Condition:

Contrast / Brightness = 100%

CCT = USER COLOR (R/G/B=100%)

CR(6500K) –Condition:

Contrast / Brightness = 100%

CCT = 6500K

Lv (5400K) / Lv (Max) x 100% > 75%

Lv(Brightness=0%) / Lv(Brightness=100%) x 100% ≤ 55%

Lv(Contrast=0%) / Lv(Contrast=100%) x 100% ≤ 30%

Same as the Contrast Ratio in section 4-6

“TFT LCD PANEL”

CR(6500K) / CR(Max) ≧ 93%

Saturation

Contrast = Default

Brightness = Default

NO VISIBLE SATURATION

Test pattern = 64-gray

Contrast = 100%

Brightness = 100%

8~10 VISIBLE SATURATION

Test pattern = 64-gray

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Contrast = 100%

Brightness = 100%

Input signal level = 720mV

Test pattern = 64-gray

Preset Color Temperatures

sRGB It should meet IEC 61966-2-1 (1999-10) standard.

Preset 1

Preset 2 (Primary)

Preset 3

Preset Color Temperature

CCT (typ) = 9300K (u’CCT=0.1888; v’ CCT=0.4457)

CCT (max) = 10250K, CCT (min) = 8500K Δu’v’<0.01 (@ Full White pattern)

CCT (typ) = 6500K (u’CCT=0.1978; v’ CCT=0.4684)

CCT (max) = 6950K, CCT (min) = 6100K Δu’v’<0.01 (@ Full White pattern)

CCT (typ) = 5400K (u’CCT=0.2044; v’ CCT=0.4808)

CCT (max) = 6185K, CCT (min) = 4935K Δu’v’<0.01 (@ Full White pattern)

Each color preset shall be adjustable. Red, Green,

and Blue shall be individually controlled.

8~10 VISIBLE SATURATION

Video Cards Compatibility

Peaking Performance: Peaking is not adjustable

Raster Artifacts

● Video Artifacts : No visible streaking, sag, or smearing artifacts when driven by the specified

video cards in the primary mode and after user adjustment to best condition

● Power Supply, and Grounding Artifacts : No visible artifacts in any specified video mode

within the horizontal or vertical frequency range of the monitor

● Temperature Drift : Image shall not drift or lose fine-tune adjustment

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MECHANICAL

Dimension

Dimension (Desktop)

Width 416mm

Height (Height adjust to the bottom) 429mm

Depth 210mm

Monitor Weight 4.6KG / 10.12lb

*Refer to Figure 1

Dimension (Head Only / Wall Mount)

Width 416mm

Height 364mm

Depth 68mm

Monitor Weight 4.2KG / 9.25lb

*Refer to Figure 1

Ergonomics

Tilt Up step 1

Tilt Down From 0º down to -5º

0° TO 20.5°±3°

Swivel Right N/A

Swivel Left N/A

Height Adjust N/A

Pivot N/A

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3. FRONT PANEL CONTROLS AND INDICATORS

Short Cuts Function from the button(s)

[1] Main Menu [2] Auto Image Adjust

[▼] or [▲]

[▼]+ [▲] Recall both of Contrast and Brightness to default

[1] + [2]

[1] + [▼] + [▲]

(keep pushing 5 sec)

[1] + [▼] Power Lock [1] + [▲] OSD Lock

Remark : All the short cuts function are only available while OSD off

Front Panel Hardware Controls

Power Switch (Front Head) Power Control, soft Power Switch.

Power LED (Front Head)

Front Panel Controls (Head) [ 1 ] [ 2 ] [ ][▲] [▼]

Reaction Time OSD must fully appear within 0.5s after pushing [ 1 ]

Main Menu Controls Auto Image Adjust

Contrast/Brightness*

Audio Adjust (For VA903m-3 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

Setup Menu

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

Traditional Chinese, Japanese], Resolution Notice, OSD Position*1, OSD Timeout, OSD Background

Memory Recall

*1 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

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

To immediately activate Contrast menu. It should be change to Brightness OSD by push button [2]

Toggle 720x400 and 640x400 mode when input 720x400 or 640x400 mode

White Balance (Not shown on user’s guide)

Green – On / Orange – Active Off Dark = Soft Power Switch OFF [ ] Power

[ 1 ] BUTTON 1

[ 2 ] Button 2

[▲] UP ARROW BUTTON [▼] DOWN ARROW BUTTON

Note: Power Button, Button 1 and Button 2 must be one-shot logic operation. (i.e. there should be no cycling)

Fine Tune, Sharpness*2

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Function descriptions OSD Lock short cuts function for the buttons

The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user then tries to access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen for 3 seconds showing "OSD Locked". The OSD lock will be deactivated by pressing the front panel control buttons "(1), & (▲)" again for 10 seconds. Note1: When the OSD is locked will lock all functions, including “Volume” and “Mute” Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD Locked” Note 3: OSD Lock should not lock Power Button and Power Lock function

Power Lock short cuts function for the buttons

The power button lock will be activated by pressing the front panel control buttons "(1), & (▼)" for 10 seconds. Locking the power button means that the user won't be able to turn off the LCD while the power button is locked. If the user presses the power button while it is locked, a message will appear on the screen for 3 seconds showing "Power Button Locked". It also means that with the power button locked, the LCD would automatically turn back "On" when power is restored after a power failure. If the power button is not in the locked mode, then power should return to it's previous state when power is restored after a power failure. The power button lock will be deactivated by pressing the front panel control buttons "(1), & (▼)" again for 10 seconds Note 1: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate “Power Button Locked”

Note 2: Power should only be lockable in the “On State”

Memory Recall Actions

Memory Recall action on the analog and digital mode as below

1. Set the factory defaults as shown in Section 4-7

2. Clean all the mode setting buffer

3. Execute Auto Image Adjust

Note: Memory Recall should have no effect for Language, Power Lock, User Color Settings

Resolution Notice Actions

1. Resolution Notice OSD should show on screen after changing to non-native mode for 30 sec

2. The OSD should disappear after 10 sec or by pushing button [1] or [2]

Resolution Notice function should be disabled when push button [2] under Resolution

Notice OSD

0-Touch™ Function Actions

1. Execute Auto Image Adjust when new mode detected, and save the settings to buffer

for further use

2. It should be reset by Memory Recall function

(Should not reset by power off, power unplug and others) OSD Auto Save

The OSD shall save new settings when it is turned off by the user or when it times out.

There shall not be a separate save

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Factory Defaults Item Defaults Item Defaults

Contrast 70% Volume 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

OSD Background Enabled

Resolution Notice Enabled

640x480@60Hz 720x480@60Hz In SOG and Composite, 720x480@60Hz 640x480@60Hz In SOG and Composite, 1152x864@75Hz 1152x870@75Hz In SOG and Composite, 1280x768@60/75/85Hz

50% (For VA903m-3 only)

640x480@60Hz

N/A

1024x768@60/75/85Hz

AUDIO INTERFACE (SPEAKER SPECIFICATION) (For VA903m-3 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 @ <15% distortion Signal to Noise Ratio 50 dB Frequency response 200 Hz – 20 Khz Distortion <15% THD (@1kHz)

Vibration

Screen image Connector PC99 requirement Audio

There should be no audible vibration with volume at 100%. (Input signal within 1.0 Vrms) There should be no affect on the screen image stability under any conditions

Lime Green pantone # 577C in Cable type / length 3.5mm stereo cable / 1.8m length

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

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consumption in Active Off mode, when the Audio

Cable is connected

4. Circuit Description

A. AC-DC CONVERTER

The power supply with a high-integrated green-mode PWM controller provides several features to

enhance the performance of power flyback converters.

U801 is a PWM controller and provides many protection functions.

U802 is a photo couple to transfer the feedback signal from the second side which U803 detected both of

the output DC voltage on 5V and 24V.

Z802 detected the working voltage on U801 and Q802 would pull down the voltage on U801 pin5 to

shut down U801 if feedback loop was failed.

R828 would be a dynamic load which was active while backlight was turned off and system still

working on, this kept 24V output voltage under 32V to protect the panel. After system went to

power saving mode, the R828 would no loaded. This was detected by Z803 active the R828 to load or

not.

B，Scaling Controller

Overview

Realtek RTD2523B series products are all-in-one LCD monitor controllers support up to

SXGA/XGA(optional), and integrate Realtek high performance ADC, TMDS Rx(optional), scaling engine,

OSD engine, LVDS TX, RSDS TX and so on. Moreover, all products are pin compatible in low pin count

package to save cost and make the design easier

General

z Embedded dual DDC support DDC1, DDC2B, DDC/CI

z Zoom scaling up and down

z Embedded Pattern Generator

z No external memory required.

z Require only one crystal to generate all timing

z Embedded reset control output

z Embedded crystal output to MICROP

z 3 channels 8 bits PWM output, and selectable PWM clock frequency.

Pin Description

(I/O Legend: A = Analog, I = Input, O = Output, P = Power, G = Ground)

 ADC: 15 pins

Name

ADC_GND AG 27 ADC ground ADC_REFIO AP 28 ADC band-gap voltage de-coupling 1.20V ADC_VDD AP 29 Analog power (3.3V) BLUE+ AI 30 Analog input from BLUE channel BLUE- AI 31 ADC_GND AG 32 ADC ground SOG/ADC_TEST AIO 33 SOG in/ADC test pin GREEN+ AI 34 Analog input from GREEN channel GREEN- AI 35 Analog input ground from GREEN

ADCB_VDD AP 36 Analog power (3.3V) RED+ AI 37 Analog input from RED channel

I/O

Pin No Description Note

Analog input ground from BLUE channel

channel

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RED- AI 38 Analog input ground from RED channel ADC_GND AG 39 Analog ground ADC_GND AG 40 Analog ground ADC_VDD AP 41 Analog power (3.3V) AHS AI 42 Analog HS input (10), (4), (5)

AVS AI 43 Analog VS input (2), (4), (5)



PLL: 8 pins

Name

XO AI 1 Reference clock output XI AO 2 Reference clock input DPLL_GND AG 3 Ground for digital PLL DPLL_VDD AP 4 Power for digital PLL (3.3V) APLL_VDD AP 5 Power for multi-phase PLL (3.3V) PLL_TEST1 AIO 6 Test Pin 1 / IRQ# PLL_TEST2 AIO 7 Test Pin 2/Power-on-latch for crystal out

APLL_GND AG 8 Ground for multi-phase PLL

I/O

Pin No Description Note

Frequency

 Control Interface: 7 pins

Name I/O Pin No Description Note

SDIO [0] IO 54 Serial control I/F data in / Parallel port

data [0]

SDIO [1] / TCON [4] /

BBLU [0]

SDIO [2] / TCON [3] /

BBLU [1]

SDIO [3] / PWM2 /

TCON [2]

SCLK I 50 Serial control I/F clock (2), (3), (5)

SCSB I 111 Serial control I/F chip select (2), (3), (5)

RESET O 56 RESET output for Micron (2), (5), (6) / 2mA

 Display & TCON/VIDEO-8 Port: 54 pins

IO 53 Parallel port data [1] / TCON [4] / TTL

BBLU [0]

IO 52 Parallel port data [2] / TCON [3] / TTL

BBLU [1]

IO 51 Parallel port data [1] / TCON [4] / PWM2 (1), (2), (3), / 2mA

(2), (3), / 2mA

(1), (2), (3), / 2mA

■:LVDS+RSDS+TTLO ■:RSDS+TTLO ■:RSDS+TTLIO■:TTLO ■:TTLIO

NO.

6-bits

Dual RSDS

6 bits

Single RSDS

8/6 bits

Dual/Single

8 bits

Dual/Single

6 bits

Dual/Single

Note

TTL

S[3] /

TCON[2] /

PWM2

S[2] /

TCON[3]

(1), (2), (3)/

2mA

(1), (2), (3)/

2mA

51 S[3] /

TCON[2] /

PWM2

52 S[2] /

TCON[3]

S[3] /

TCON[2] /

PWM2

S[2] /

TCON[3]

LV DS

S[3] /

TCON[2] /

PWM2

S[2] /

TCON[3]

TTL

S[3] /

TCON[2] /

PWM2

S[2]

/BBLU[1] /

TCON[3]

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53 S[1] /

S[1] /

S[1]/ BBLU[0]

S[1] /

(1), (2), (3)/

TCON[4]

55 PWM2 /

COUT /

TCON[13]

59 BB3P BB3P NC BBLU [7] BBLU [7]

60 BB3N BB3N NC BBLU [6] BBLU [6]

61 BB2P BB2P NC BBLU [5] BBLU [5]

62 BB2N BB2N NC BBLU [4] BBLU [4]

63 BB1P BB1P NC BBLU [3]/T0 BBLU [3]

64 BB1N BB1N NC BBLU [2]/T1 BBLU [2]

65 BCLKP BCLKP NC BGRN [1]/T2 TCON [6]

66 BCLKN BCLKN NC BGRN [0]/T3 TCON [5]

67 BG3P BG3P NC BGRN [7] BGRN [7]

68 BG3N BG3N NC BGRN [6] BGRN [6]

73 BG2P BG2P TODP BGRN [5]/T4 BGRN [5]

74 BG2N BG2N TODN BGRN [4]/T5 BGRN [4]

TCON[4]

PWM2 /

COUT /

TCON[13]

TCON[4]

PWM2 /

COUT /

TCON[13]

/ TCON[4]

PWM2 /

COUT /

TCON[13]

TCON[4]

PWM2 /

COUT /

TCON[13]

2mA

(1), (2), (3)/

2mA

75 BG1P BG1P TOCLKP BGRN [3]/T6 BGRN [3]

76 BG1N BG1N TOCLKN BGRN [2]/T7 BGRN [2]

77 BR3P BR3P TOCP BRED [7]/T8 BRED [7]

78 BR3N BR3N TOCN BRED [6]/T9 BRED [6]

79 BR2P BR2P TOBP BRED [5]/T10 BRED [5]

80 BR2N BR2N TOBP BRED [4]/T11 BRED [4]

81 BR1P BR1P TOAP BRED [3]/T12 BRED [3]

82 BR1N BR1N TOAP BRED [2]/T13 BRED [2]

85 AB3P NC TEDP ABLU [7]/T14 ABLU [7]

86 AB3N NC TEDN ABLU [6]/T15 ABLU [6]

87 AB2P NC TECLKP ABLU [5]/T16 ABLU [5]

88 AB2N NC TECLKN ABLU [4]/T17 ABLU [4]

89 AB1P NC TECP ABLU [3]/T18 ABLU [3]

90 AB1N NC TECN ABLU [2]/T19 ABLU [2]

91 ACLKP NC TEBP ABLU [1]/T20 TCON [1]

92 ACLKN NC TEBN ABLU [0]/T21 TCON [0]

93 AG3P NC TEAP AGRN [7]/T22 AGRN [7]

94 AG3N NC TEAN AGRN [6]/T23 AGRN [6]

99 AG2P TCON [11] NC AGRN [5]/T24 AGRN [5]

100 AG2N TCON [10] NC AGRN [4]/T25 AGRN [4]

101 AG1P TCON [9] NC AGRN [3]/T26 AGRN [3]

102 AG1N TCON [8] NC AGRN [2]/T27 AGRN [2]

103 AR3P TCON [7] NC ARED [7]/T28 ARED [7]

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104 AR3N TCON [6] NC ARED [6]/T29 ARED [6]

105 AR2P TCON [5] NC ARED [5]/TH ARED [5]

106 AR2N TCON [1] NC ARED [4]/TV ARED [4]

107 AR1P TCON [0] NC ARED [3]/TE ARED [3]

108 AR1N NC NC ARED [2]/TK ARED [2]

113 PWM2 /

COUT /

TCON[12]

114 TCON [11]

/V[0]

115 TCON [10]

/V[1]

116 TCON [9] /

V[2]

117 TCON [8] /

V[3]

118 TCON [7] /

V[4]

119 TCON [6] /

V[5]

122 TCON [5] /

PWM2 /

COUT /

TCON[12]

V [0] V [0] ARED [0] TCON [11] (1), (7), (8)

V [1] V [1] BRED [1] TCON [10] (1), (7), (8)

V [2] V [2] BRED [0] TCON [9] (1), (7), (8)

V [3] V [3] AGRN [1] TCON [8] (1), (7), (8)

V [4] V [4] AGRN [0] TCON [7] (1), (7), (8)

V [5] V [5] DHS DHS (1), (7), (8)

V [6] V [6] DVS DVS (1), (7), (8)

PWM2 /

COUT /

TCON[12]

ARED [1] PWM2 /

COUT /

TCON[12]

(9)

V[6]

123 TCON [1] /

V[7]

124 TCON [0] /

VCLK

V [7] V [7] DENA DENA (1), (7), (8)

VCLK VCLK DCLK / TCLK DCLK / TCLK (1), (7), (8)

 TMDS: 18 pins

Name I/O Pin No

TMDS_TST/ PWM1 AIO 9 TMDS_TEST Pin / PWM1 /

TMDS_GND G 10

TMDS_VDD P 11 (3.3V)

EXT_RES A 12 Impedance Match Reference.

TMDS_VDD P 13 (3.3V)

RX2P I 14 Differential Data Input

RX2N I 15 Differential Data Input

Description

Power-on-latch for serial / parallel port

Note

TMDS_GND G 16

RX1P I 17 Differential Data Input

RX1N I 18 Differential Data Input

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TMDS_VDD P 19 (3.3V)

RX0P I 20 Differential Data Input

RX0N I 21 Differential Data Input

TMDS_GND G 22

RXCP I 23 Differential Data Input

RXCN I 24 Differential Data Input

TMDS_GND G 25

TMDS_VDD P 26 (3.3V)

 PWM Interface: 3-2=1 pin (PWM1, PWM2 can be selected from 1 of 3 possible pins.)

Name

I/O

Pin No Description Note

PWM2 / TCON [2] / S

[3]

PWM2 / TCON [13] /

COUT

PWM2 / TCON [12] /

COUT

PWM1 / TMDS_TST AIO 9 PWM1/ TMDS_TEST Pin /

PWM1 / DDCSDA /

TCON [1] / BBLU [0]

PWM1 / DDCSDA2

(HDCP) / TCON [7]

PWM0 / REFCLK IO 112 PWM0 / (In / out) test pin for DCLK /

O 51 PWM2 / TCON [2] / SDIO [3] (1), (2), (3), (5), (8),

O 55 PWM2 / TCON [13] / Crystal out (2), (8), (9)

O 113 PWM2 / TCON [12] / Crystal out (2), (8), (9)

Power-on-latch for serial / parallel port

IO 47 PWM1 / DDC serial control I/F data input

/ output / TCON [4]

IO 125 PWM1 / DDC serial control I/F data input

/ output / TCON [7]

Video8 even-odd signal

 DDC Channel: 4 pins

Name I/O Pin No Description Note

(2), (7), (8)

(1), (2), (3), (5), (8),

(2), (9)

DDCSCL / TCON [0] /

BBLU [1]

DDCSDA / TCON [1] /

PWM1 / BBLU [0]

DDCSCL2 (HDCP) /

TCON [5]

DDCSDA2 (HDCP) /

TCON [7] /PWM1

I 46 DDC serial control I/F clock / TCON [0] /

TTL BBLU [1]

IO 47 DDC serial control I/F data input / output

/ TCON [1] / PWM1 / TTL BBLU [0]

I 126 DDC serial control I/F clock / TCON [5] (2), (3), (5)

IO 125 DDC serial control I/F data input / output

/ TCON [7] / PWM1

(2), (3), (5)

(1), (2), (3), (5), (6),

(8)/ 8mA /no slew

(1), (2), (3), (5), (6),

(8)/ 8mA /no slew

 Power & Ground: 22 pins

Name

3.3V Power P 49,121 VCCIO: 2

I/O

Pin No Description

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3.3V Ground G 48,120 GNDIO: 2

3.3V Power P 58,71,83,95,110 PVCC: 5

3.3V Ground G 57,72,84,96,109 PGND: 5

2.5V Power P 45,69,98,127 VCCK: 4

2.5V Ground G 44,70,97,128 GNDIK: 4 Note: (1) TTL compatible CMOS Input (Vt=1.7V); VCC=3.3V;

(2) 5V tolerance pad; (3) Internal 75K Ohms pull high resistor. (4) Internal 75K Ohms pull low resistor. (5) Schmitt trigger CMOS Input (Vt=1.4-~2.2V); (6) Open-Drain, Output Drive low & Pull-high. (7) Bi-directional input/output (8) Programmable driving current (2~10mA)

(9) TTL output 5V & 3.3V (10) 4V tolerance pad

C, MTV512M

The MTV512M micro-controller is an 8051 CPU core

embedded device especially tailored for flat panel

display applications. It includes an 8051 CPU core,

768-byte SRAM, 4 channels of 6-bit ADC, 3 external

counters/timers, 6 channels of PWM DAC, VESA

DDC interface, and a 64K-byte internal program

Flash-ROM memory in 44-pin PLCC package

FEATURES

• 8051 core, 12MHz operating frequency with

single/double CPU clock option

• 0.35um process; 3.3V power supply

• 768-byte RAM; 64K-byte program Flash memory

• Maximum 6 channels of PWM DAC

• Compliant with VESA DDC1/2B/2Bi/2B+ standard

• Dual slave IIC addresses; two H/W auto transfer

DDC1/DDC2x data for both D-sub and DVI

interfaces

• Watchdog timer with programmable interval

• Support external counters/timers, 1 & 2

• Single/double frequency clock output

• Two external interrupts, INT1 is shared with Slave

IIC interrupt source.

• Maximum 4 channels of 6-bit ADC

• Flash-ROM code protection selection

• 44-pin PLCC package

D. INVERTER

In order to drive the CCFLs embedded in the panel module, there is a push-pull inverter to convert by the controller.

from input 24V up to hundreds of AC voltage output peak to peak.

The inverter is formed by symmetric in order to drive the separate lamp modules.

The input stage consists of a PWM controller, push-pull inverter, and switching MOSFET to convert DC input into

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AC output.

The output stage consists of a tuning capacitor, transformer, and push-pull MOSFET pair to boost AC output up to

hundreds of voltage peak to peak.

And one resister is serial to lamp for output voltage feedback.

There are two signals which control the inverter come from system to turn on the inverter and control brightness.

Logic “low” level which send to U901 is turn on the inverter.

BL-ADJ signal control brightness by DC level which was integral from PWM signal.

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5. Adjusting Procedure

1. Function test

1.1 products

19” LCD Monitor

1.2 test equipment

Color video Signal& pattern (Or PC with SXGA resolution and a sound card)

1.3 Test Condition

Before function test and alignment ,each LCD Monitor should be warmed up at least

30 minutes with the following conditions:

A: in roon temperature

B with full white screen ,RGB ,and black

C. with cycled display model:

1280 x 1024 @ 60Hz

1.4 Test display& Pattern

1.4.1 Compatible model

Item Timing Analog

1 640 x 350 @ 70Hz, 31.5kHz 2 640 x 480 @ 50Hz, 24.68KHZ 3 640 x 480 @ 60Hz, 31.5kHz 4 MAC 640 x 480 @ 67Hz, 35.0kHz 5 640 x 480 @ 72Hz, 37.9kHz 6 640 x 480 @ 75Hz, 37.5kHz 7 640 x 480 @ 85Hz, 43.27kHz 8 720 x 400 @ 70Hz, 31.5kHz

9 800 x 600 @ 56Hz, 35.1kHz 10 800 x 600 @ 60Hz, 37.9kHz 11 800 x 600 @ 72Hz, 48.1kHz 12 800 x 600 @ 75Hz, 46.9kHz 13 800 x 600 @ 85Hz, 53.7kHz 14 MAC 832 x 624 @ 75Hz, 49.7kHz 15 1024 x 768 @ 60Hz, 48.4kHz 16 1024 x 768 @ 70Hz, 56.5kHz 17 1024 x 768 @ 72Hz, 58.1kHz 18 1024 x 768 @ 75Hz, 60.0kHz 19 1024 x 768 @ 85Hz, 68.67KHZ 20 1152 x 864 @ 75Hz, 67.5KHZ 21 MAC 1152x870@75HZ, 68.68KHZ 22 1280 x 960 @ 60Hz, 44.93KHZ 23 1280 x 960 @75Hz, 56.25KHZ 24 1280 x 1024 @ 60Hz, 63.98KHZ 25 1280 x 1024 @ 75Hz, 79.97KHZ

*1. Tolerance ≧ ± 2kHz.

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes

*2. Any timing not in the list, it should display as normal or show o n “OUT OF RANGE” OSD message without

blanking.

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

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