Viewsonic VP920 b-1 Service Manual 1a

Service Manual

ViewSonic VP920-1

VP920b-1

Model No. VS10929

19” Color TFT LCD Display

(VP920-1_VP920b-1_SM Rev. 1a Jan. 2006)

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

Copyright © 2005 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 aregistered 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

1a 01/05/2006 Initial release Jamie Chang

Description of Changes Editor

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 9

4. Circuit Description 16

5. Adjustment Procedure 21

6. Troubleshooting Flow Chart 43

7. Block Diagram 47

8. Recommended Spare Parts List 73

9. Exploded Diagram and Exploded Parts List 77

10. Schematic Diagrams 78

11. PCB Layout Diagrams 86

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

1. Precautions and Safety Notices

1. Appropriate Operation

(1) Turn off the product before cleaning. (2) Use only a dry soft cloth when cleaning the LCD panel surface. (3) Use a soft cloth soaked with mild detergent to clean the display housing. (4) Disconnect the power plug from AC outlet if the product is not used for a long period of

time.

(5) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display

off. (6) Do not touch the LCD panel surface with sharp or hard objects. (7) Do not place heavy objects on the LCD display, video cable, or power cord. (8) Do not use abrasive cleaners, waxes or solvents for your cleaning. (9) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas susceptible to excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- Place in direct sunlight.

2. Caution

No modification of any circuit should be attempted. Service work should only be performed after you are thoroughly familiar with all of the following safety checks and servicing guidelines.

3. Safety Check

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit, the voltage is exposed in such areas as the associated transformer circuits.

4. Power Supply Requirements

The external AC power operating range shall be from 90 to 264Vac

5. LCD Module Handling Precautions

5.1. Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it. (2) Be sure to turn off power supply when inserting or disconnecting from input connector. (3) Wipe off water drop immediately. Long contact with water may cause discoloration or

spots. (4) When the panel surface is soiled, wipe it with absorbent cotton or other soft cloth. (5) Since the panel is made of glass, it may break or crack if dropped or bumped on hard

surface. (6) Since CMOS LSI is used in this module, take care of static electricity and insure human

earth when handling. (7) Do not open nor modify the Module Assembly. (8) Do not press the reflector sheet at the back of the module to any directions. (9) In case if a Module has to be put back into the packing container slot after once it was

taken out from the container, do not press the center of the CCFL Reflector edge.

Instead, press at the far ends of the CFL Reflector edge softly. Otherwise the TFT

Module may be damaged. (10) At the insertion or removal of the Signal Interface Connector, be sure not to rotate nor

tilt the Interface Connector of the TFT Module. (11) After installation of the TFT Module into an enclosure (LCD monitor housing, for

example), do not twist nor bend the TFT Module even momentary. At designing the

enclosure, it should be taken into consideration that no bending/twisting forces are

applied to the TFT Module from outside. Otherwise the TFT Module may be damaged. (12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please

follow local ordinances or regulations for disposal. (13) Small amount of materials having no flammability grade is used in the LCD module.

The LCD module should be supplied by power complied with requirements of Limited

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Power Source (IEC60950 or UL1950), or be applied exemption.

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

Circuit (IEC60950 or UL1950). Do not connect the CFL in Hazardous Voltage Circuit.

5.2. Handling 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 polarizer.

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

Surface of the LCD panel is pressed by fingers

and that may cause “Mura”

panel. That may cause “Mura”

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

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”

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

2. Specification

1. General Requirements

General Specifications

Test Resolution & Frequency “1280 x 1024” @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default:

Contrast = 100%, Brightness = 100%

2. Signal Interface

Video Interface

Analog Input Connector DB-15 (Analog)

DVI = DVI-D (Digital) Default Input Connector Defaults to the first detected input Video Cable Connector DB-15 Pin out Compliant DDC 1/2B. Video Signals Video RGB (Analog)

Separate Sync / Composite Sync / SOG

TMDS (Digital) Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)

Exclusions Not compatible with interlaced video.

3. Power

Power Supply

Input Voltage Range 90 to 264 VAC Power Dissipation 40 Watts (Typ.)

4. AUDIO INTERFACE (SPEAKER SPECIFICATION)

Speaker specification Line input connection 3.5 mm stereo jack Line input signal 1.0 Vrms Line input impedance 22 kOhm Maximum power output (Electric) 1 W@ < 15 % distortion Signal to Noise Ratio 40 dB Frequency response 100 Hz – 20 Khz Distortion < 5 % THD (@1kHz)

Vibration

Screen image

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

Audio DPMS

 No any sympathetic or abnormal noise allowed under Volume OSD ≤ 70%

5. Electrical Requirements

Horizontal Frequency 24 – 82 kHz Vertical Refresh Rate 50 – 85 Hz. Maximum Pixel Clock 135 MHz Sync Polarity Independent of sync polarity.

There should be no audible vibration with volume at 100% and treble / bass at default. There should be no affect on the screen image stability under any conditions.

Speakers should be off when the rest of the monitor is in power saving.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Panel Characteristics :

Source Panel

Model number Hannstar HSD190ME13 A02 Type Active Matrix TFT, TN technology Active Size 19” Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.264 mm Glass Treatment Anti-Glare # of Backlights 4 CCFL Backlight Life 50000 Hrs (Typ)

250 cd/m2 (Typ after 30 minute warm up) Luminance (Center) – CCT = User Color (R/G/B=100%), Contrast/ Brightness = Max

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

Brightness Uniformity 75 % (Typ) / 70 % (Min) Contrast Ratio 600 :1 (Typ) 400 : 1 (Min) Color Depth 16.2 million colors (6+2 bit panel)

Horizontal Viewing Angle

Vertical Viewing Angle

140 degrees (Typ) / 120 degrees (Min) @ CR>10

160 degrees (Typ) @ CR>5

130 degrees (Typ) / 110 degrees (Min) @ CR>10

140 degrees (Typ) @ CR>5

On/Off

Typical = 8 ms

Maximun = 20 ms Response Time 10%-90% @ Ta=25°C

GTG

Average ≦ 4 ms (Over Drive by scalar)

*GTG response time was defined as average value of Tr

and Tf for gray to gray signal change.

Mercury

3 mg per lamp

Panel Defects Please see Panel Quality Specifications.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Timing Table

Analog

Separated

Item Timing

Digital - TMDS

Composite

SOG

For Composite and SOG signal,

1. Image vertical size might be not

1 640 x 350 @ 70 Hz, 31.5 KHz 　　　　

2. “640x400” or “720x400” shows

For Composite and SOG signal,

1. Image vertical size might be not

2 640 x 400 @ 60 Hz, 31.5 KHz 　　　　

2. “640 x480” or “720x480” shows

Toggle 640x400@70Hz and

3 640 x 400 @ 70 Hz, 31.5 KHz 　　　　

720x400@70Hz by [1]+[2] (primary = 720x400@70Hz)

4 640 x 480 @ 50 Hz, 24.7 KHz 　　　　

Toggle 640x480@60Hz and

5 640 x 480 @ 60 Hz, 31.5 KHz 　　　　

720x480@60Hz by [1]+[2] (primary = 640x480@60Hz)

6 640 x 480 @ 67 Hz, 35 KHz 　　　　 For MAC

Remark

full screen. The position is at the center.

on Information OSD.

full screen. The position is at the center.

on Information OSD.

7 640 x 480 @ 72 Hz, 37.9 KHz 　　　　

8 640 x 480 @ 75 Hz, 37.5 KHz 　　　　

9 640 x 480 @ 85 Hz, 43.3 KHz 　　　　

Toggle 640x400@70Hz and

10 720 x 400 @ 70 Hz, 31.5 KHz 　　　　

720x400@70Hz by [1]+[2] (primary = 720x400@70Hz)

480p

11 720 x 480 @ 60 Hz, 31.5 KHz 　　　　

Toggle 640x480@60Hz and 720x480@60Hz by [1]+[2] (primary = 640x480@60Hz)

12 720 x 576 @ 50 Hz, 31.3 KHz 　　　　 576p

13 800 x 600 @ 56 Hz, 35.1 KHz 　　　　

14 800 x 600 @ 60 Hz, 37.9 KHz 　　　　

15 800 x 600 @ 72 Hz, 48.1 KHz 　　　　

16 800 x 600 @ 75 Hz, 46.9 KHz 　　　　

17 800 x 600 @ 85 Hz, 53.7 KHz 　　　　

18 832 x 624 @ 75 Hz, 49.7 KHz 　　　　 For MAC

19 1024 x 768 @ 60 Hz, 48.4 KHz 　　　　

For Composite and SOG signal, toggle 1024x768@60Hz and 1280x768@60Hz by [1]+[2] (primary = 1024x768@60Hz)

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

20 1024 x 768 @ 70 Hz, 56.5 KHz 　　　　

21 1024 x 768 @ 72 Hz, 58.1 KHz 　　　　

22 1024 x 768 @ 75 Hz, 60.2 KHz 　　　　 For Composite and SOG signal,

toggle 1024x768@75Hz and 1280x768@75Hz by [1]+[2] (primary

23 1024 x 768 @ 85 Hz, 68.7 KHz 　　　　

= 1024x768@75Hz) For Composite and SOG signal, toggle 1024x768@85Hz and 1280x768@85Hz by [1]+[2] (primary = 1024x768@85Hz) For Composite and SOG signal,

24 1152 x 864 @ 75 Hz, 67.5 KHz 　　　　

toggle 1152x864@75Hz and 1152x870@75Hz by [1]+[2] (primary = 1152x864@75Hz) For Composite and SOG signal,

25 1152 x 870 @ 75 Hz, 68.7 KHz 　　　　

toggle 1152x864@75Hz and 1152x870@75Hz by [1]+[2] (primary = 1152x864@75Hz)

26 1280 x 720 @ 50 Hz, 37.5 KHz 　　　　 720p

27 1280 x 720 @ 60 Hz, 45 KHz 　　　　 720p

28 1280 x 768 @ 50 Hz, 39.6 KHz 　　　　

For Composite and SOG signal,

29 1280 x 768 @ 60 Hz, 47.8 KHz 　　　　

toggle 1024x768@60Hz and 1280x768@60Hz by [1]+[2] (primary = 1024x768@60Hz) For Composite and SOG signal,

30 1280 x 768 @ 75 Hz, 60.3 KHz 　　　　

toggle 1024x768@75Hz and 1280x768@75Hz by [1]+[2] (primary = 1024x768@75Hz) For Composite and SOG signal,

31 1280 x 768 @ 85 Hz, 68.6 KHz 　　　　

toggle 1024x768@85Hz and 1280x768@85Hz by [1]+[2] (primary = 1024x768@85Hz)

32 1280 x 960 @ 50 Hz, 49.4 KHz 　　　　

33 1280 x 960 @ 60 Hz, 59.7 KHz 　　　　

34 1280 x 960 @ 75 Hz, 75.2 KHz 　　　　

35 1280 x 1024 @ 60 Hz, 64 KHz 　　　　

36 1280 x 1024 @ 75 Hz, 80 KHz 　　　　

*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.

6. Mechanical

Dimension (Desktop)

Width 416 mm (16.4 inch)

Height (Height adjust to the bottom) 479mm (18.9 inch)

Depth 238mm (9.4 inch)

Monitor Weight 6.3 Kg (13.86 lbs)

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Dimension (Head Only / Wall Mount)

Width 416 mm (16.4 inch)

Height 352mm (13.9 inch)

Depth 70mm (2.8 inch)

Monitor Weight 4.6 Kg (10.12 lbs)

*Refer to Figure 1

Ergonomics

Tilt Up ≥ 20º

Tilt Down From 0º down to -3º

Swivel Right No

Swivel Left No

Height Adjust 0 ~ ≥ 100 mm

Pivot CW 90º

Package Specifications

ViewSonic Packaging Spec

The “Top Level Assembly” shall meet the ViewSonic Corporation Packaging Spec, VSCPACSPEC003

ViewSonic Pallet Spec Refer to ViewSonic Pallet Load Specification REV.1.I

Ink The ink shall not rub off after a suitable drying time.

Multiple Trips

The carton shall withstand 10 trips by any combination of air, rail, land, or sea transportation.

One Unit Packing (Standard)

Shipping Carton Type One piece construction with single wall, 0.6 Kg

Shipping Carton Handholds No

Plastic handle PE-LD, 12 g

Poly form EPS, 128 g, 2 pices

Accessory plastic bags PE-LD, 2g

PE bag (covers monitor) PE-LD, 3g

Pallet (for Europe) Poplar, 10 Kg

Pallet (for others) Fumigation wood, 10 Kg

Width / Height / Depth 476 mm (18.7 ") x 470 mm (18.5 ") x 214 mm (8.4")

Gross Weight 8.3 Kg (18.26 lbs)

# units per Pallet 48 units

40’ Container Loading 960 pieces

20’ Container Loading 480 pieces

7. Environmental

Operating Temperature 0°C to +40°C

Storage Temperature -20°C to +60°C

Operating Relative Humidity 20% to 90% RH Non-Condensing

Storage Relative Humidity 5% to 90% RH Non-Condensing

Operating Altitude 0 to +3,000 meters

Storage Altitude 0 to +12,000 meters

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

3. Front Panel Function Control Description

Main Menu

with OSD controls

Front Control Panel

shown below in detail

Displays the Main

Menu or exits the

control screen and

saves adjustments.

Scrolls through menu options and adjusts the displayed control.

Increases the volume, decreases the volume, and mutes the audio.

Displays the control screen for the highlighted control.

Also toggles between two controls on some screens.

Also a shortcut to toggle analog and digital connection.

Power light Green = ON Orange = Power Saving

Standby Power On/Off

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

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.

4. To adjust the setting, press the upSor downTbuttons.

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 1280 x 1024 @ 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.)

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Main Menu Controls

Adjust the menu items shown below by using the upSand downTbuttons.

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.

Input Select allows the user to toggle between an analog and a digital signal.

Audio Adjust increases the volume, decreases the volume, and mutes the audio.

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).

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Control Explanation

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).

7500K - 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.

5000K - Adds blue and green to the screen image for a darker color.

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, pressSorT.

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

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Control Explanation

Manual Image Adjust displays the Manual Image Adjust menu.

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

right and up or down.

Horizontal Size adjusts the width of the screen image.

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

boundaries.

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 allows the user to enable or disable this notice.

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.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Control Explanation

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.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Short Cut Key

Function Key:5 KeysÆ 1 ▼ ▲ 2

[1] Main Menu

[2] Input toggle (Analog or Digital)

[▼] or [▲] to immediately activate Audio Adjust menu.

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

[1] + [2] toggle display mode (see segment “Timing Table”)

[1] + [▼] + [▲] White Balance. (Not shown on user’s guide)

[1] + [▼] Power Lock

[1] + [▲] OSD Lock

No signal + [▼] + [▲] Burning mode

[▲] + [2] + [ ] Factory Mode

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

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

4. Circuit Description

RTD2363 LCD Monitor/MFM Controller

Feature Analog RGB Input Interface

 Support up to 150MHz (up to SXGA@75Hz, 1080p)  Support Sync-On-Green(SOG) and Composite-Sync(CS) mode  Support YPrPb video input up to 1080i/1080p with Sync-Processor  On-chip high-performance PLLs

 High resolution 128 phase APLL

DVI Compliant Digital Input Interface

 Single link on-chip TMDS receiver  Operation up to 165Mhz  Direct connect to DVI compliant TMDS transmitters  High-Bandwidth Digital Content Protection (HDCP) (optional)

 Enhanced protection of HDCP secret key(optional)

Digital Output Interface

 Built-in fully programmable display timing generator  Integrated dual LVDS transmitter  Support single 18-bit TTL output interface 　  Support up to 140MHz (up to SXGA@75Hz and WXGA+60Hz)

 Integrated high-quality Spread-Spectrum PLL

Smart-FitTM

 Input format detection  Compatibility with standard VESA mode and support user-defined mode

 Smart engine for Phase and Image position calibration

Ultra-ZoomTM

 Fully programmable zoom ratios  Independent horizontal/vertical scaling  High-quality zoom algorithm  Programmable Sharpness/Smooth enhancement

 Support “Anamorphic”and “Panoramic”scaling

Memory Arbitor

 Embedded DDR-SDRAM memory Arbitor

 Support tearless Frame-Rate-Conversion

Color Processor

 Digital brightness and contrast adjustments  sRGB compliance  Support dual R/G/B 10-bit Gamma correction  3DitherTM serves as advanced dithering function

 Live-ShowTM for Response-Time-Compensation

Host Interface

 Support single/dual-edge 3-wire SPI host interface

 Provide 8x51 compatible 8-bit I/O port access

Embedded OSD

 Embedded 12K SRAM dynamically sharing with OSD frame and fonts  Support multi-color RAM font  16 color palette with 24bit true color selection

 Maximum 8 window with alpha-blending, gradient,dynamic fade-in/fade-out,

bordering/shadow/3D window type

 Every window can place anywhere on the screen.  Rotary 90,180,270 degree  Independent row shadowing/bordering.  Programmable blinking effects for each character  OSD-made internal pattern generator for factory mode

 Support 12x18~5x18 proportional font

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Others

 Embedded DDC support DDC1, DDC2B, DDC/CI  Support PWM output  Support low-voltage-reset output

 Support crystal output

Power & Technology

 3.3V/1.8V power supplier; 2.5V for DDR interface

 208-pin QFP

Ultra-ZoomTM:

 FIR up scalar with 5-segment non-linear scaling.

RGB-Color-Processor :

 Contrast  Brightness

Panel-Color-Processor :

 sRGB  Gamma Correction  3DitherTM

Live-Showtm:

 Response Time Compensation

Analog Input

RTD2363 integrates three ADCs (analog-to-digital converters), one for each color (red, green, and blue). The sync-processor can deal with Separate-Sync, Composite-Sync, Sync-On-Green, and Sync-On-Y. And the PLL can generate very low jitter clock from HS to sample the analog signal to digital data. Input data is latched within a capture window defined in registers refer to VS and HS leading edge. There are two sets of ADC input pins in RTD2363 whose internal switch can select one of them to display. RTD2363 owns a capability to display YPbPr input source which normally come from DVD Player or Setup-Box etc.. The YPbPr source can be into 1st or 2nd ADC pins.

TMDS Input

RTD2363 integrates high-speed single link receiver and high bandwidth content protection (HDCP) function. It can operate up to 165Mhz. It can effectively deal with the weak signal in long cable application which often cause signal loss.

Scale-Down

The Scale-down function are basically composed of horizontal scale-down and vertical scale-down. The horizontal scale-down can config as linear or non-linear scale-down. In non-linear scale-down, we can set three segment for different scaling ratio in order to keep image detail less-lost in the center area and express the side area which we expect it less important. The low-pass filter in front of H/V scale-down plays a role of anti-aliasing filter. Moreover, the filter prior to vertical scale-down can be config as high-pass filter to serve as vertical peaking filter.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Electric Specification DC Characteristics

Absolute Maximum Ratings

PARAMETER SYMBOL MIN TYP MAX UNITS

Voltage on Input (5V tolerant) VIN -1 5 V Electrostatic Discharge VESD ±2.5 kV Latch-Up ILA ±100 mA Ambient Operating Temperature TA 0 70 oC Storage temperature (plastic) TSTG -55 125 oC Thermal Resistance (Junction to Air) ӨJA 35.3 oC/W Table 2 DC Characteristics/Operating Condition (0'<TA<70'; VDD = 3.3V ± 0.3V)

PARAMETER SYMBOL MIN TYP MAX UNITS

Supply Voltage VDD 3.0 3.3 3.6 V Output High Voltage VOH 2.4 VDD V Output Low Voltage VOL GND 0.5 V Input High Voltage VIH 2.0 V Input Low Voltage VIL 0.8 V I/O Pull-up resistance RPU 75KΩ I/O Pull-down resistance RPD 75KΩ Input Leakage Current(VI=VCC or GND) ILI -10 +10 μA Output Leakage Current(VO=VCC or GND) ILO -20 +20μA

EM6A9320-XXMEtron 4M x 32 DDR SDRAM Features

 Fast clock rate: 300/275/250/200 MHz  Differential Clock CK & CK# input  4 Bi-directional DQS. Data transactions on both edges of DQS (1DQS / Byte)  DLL aligns DQ and DQS transitions  Edge aligned data & DQS output  Center aligned data & DQS input  4 internal banks, 1M x 32-bit for each bank  Programmable mode and extended mode registers  CAS# Latency: 3, 4, 5  Burst length: 2, 4, 8  Burst Type: Sequential & Interleave  Full page burst length for sequential type only  Start address of full page burst should be even  All inputs except DQ’s & DM are at the positive edge of the system clock  No Write-Interrupted by Read function  4 individual DM control for write masking only  Auto Refresh and Self Refresh  4096 refresh cycles / 32ms  Power supplies :

 Interface : SSTL_2 I/O compatible

VDD = 2.5V _ 5% VDDQ = 2.5V _ 5%

 Standard 144-ball FBGA package

Overview

The EM6A9320 DDR SDRAM is a high-speed CMOS double data rate synchronous DRAM containing 128 Mbits. It is internally configured as a quad 1M x 32 DRAM with a synchronous interface (all signals are registered on the positive edge of the clock signal, CK).Data outputs occur at both rising edges of CK and CK#.Read and write accesses to the SDRAM are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence.Accesses begin with the registration of a BankActivate command, which is then followed by a Read or Write command. The EM6A9320 provides programmable Read or Write burst lengths of 2, 4, 8. An auto precharge function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

The refresh functions, either Auto or Self Refresh are easy to use. In addition, EM6A9320 features programmable DLL option. By having a programmable mode register and extended mode register, the system can choose the most suitable modes to maximize its performance. These devices are well suited for applications requiring high memory bandwidth, result in a device

particularly well suited to high performance main memory and graphics applicat

MTV512M64

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 PWMDAC, VESA DDC interface, and a 64K-byte internal program Flash-ROM memory.

FEATURES

• 8051 core, CPU operating frequency up to 24MHz

• 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+/CI standard

• Watchdog timer with programmable interval

• Support external counters/timers, T0, T1, and ET2

• Single/double frequency clock output

• Two clock output ports

• Two external interrupts, INT1 is shared with Slave IIC interrupt source

• Maximum 4 channels of 6-bit ADC

• Flash-ROM code protection selection

• Hardware ISP (In System Programming), no Boot Code required

• Embedded Dual Ports DDCRAM (128-byte x 2

• Green products like Pb-Free Packages or All Green Packages available

PIN CONFIGURATION & DESCRIPTION

A “CMOS output pin” means it can sink and drive at least 4mA current. It is not recommended to use such pin as input function. An “open drain pin” means it can sink at least 4mA current. It can be used as input or output function and needs an external pull up resistor. An “8051 standard pin” is a pseudo open drain pin. It can sink at least 4mA current when output is at low level, and drives at least 4mA current for 160nS when output transits from low to high, then keeps driving at 120 uA to maintain the pin at high level. It can be used as input or output function. It needs an external pull up resistor when driving heavy load device. There is an internal pull-up resistance on each CMOS PAD and an internal pull-down resistance on each input

Low Power Reset (LVR) & Watchdog Timer

When the voltage level of power supply is below 2.4V (+/-0.4V) for a specific period of time, the LVR generates a chip reset signal. After the power supply is above 2.4V (+/-0.4V)

INVERTER

In order to drive the CCFLs embedded in the panel module, there is a half bridge inverter to convert by the controller. The input 12V up to hundreds of AC voltage output. The inverter is formed by symmetric in order to drive the separate lamp modules. The input stage consists of a PWM controller, half bridge inverter, and switching MOSFET to convert DC input into AC output. The output stage consists of a tuning capacitor, coupling capacitor, transformer, push-pull MOSFET pair to boost AC output up to hundreds of voltage. And one resister is serial to lamp for output voltage feedback. There are two signal to control the inverter which come from system. Logic “high” level which send to I901 is turn on the inverter. BRI signal control brightness by DC level which was integral from PWM signal.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

AUDIO

General description

The TDA7496L is a stereo 2W+2W class AB power amplifier assembled in the @ Powerdip 14+3+3 package, specially designed for high quality sound, TV and Monitor applications. Features of the TDA7496L include linear volume control, Stand-by and mute functions Ipeak Output Peak Current (internally limited) 0.7 0.9 A Vin Input Signal 2.8 Vrms GV Closed Loop Gain Vol Ctrl > 4.5V 28.5 30 31.5 dB GvLine Monitor Out Gain Vol Ctrl > 4.5V; Zload > 30K　-1.5 0 1.5 dB AMin VOL Attenuation at Minimum Volume Vol Ctrl < 0.5V 80 dB BW 0.6 MHz

ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit

VS DC Supply Voltage 26 V VIN Maximum Input Voltage 8 Vpp Ptot Total Power Dissipation (Tcase = 60°C) 6 W Tamb Ambient Operating Temperature 0 to 70 °C Tstg, Tj Storage and Junction Temperature -40 to 150 °C V6 Volume CTRL DC voltage 7 V

0 4 8 12 Area(cm2)

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

5. Adjusting Procedure

1. Function Test

1.1 Product

- 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 run-in and warmed up for at least 30 minutes with the following conditions: (a) In room temperature, (b) With full-white screen, RGB, and Black (c) With cycled display modes,

640*480 (H=43.27kHz, V=85Hz) 800*600 (H=53.7kHz, V=85Hz) 1024*768 (H=68.67kHz, V=85Hz) 1280*1024 (H=79.97kHz, V=75Hz)

1.4 Test Display Modes & Pattern

1.4.1 Compatible Modes

Analog Digital

1. 640 x 350 @ 70Hz, 31.5kHz

2. 640 x 400 @ 60Hz, 31.5kHz

3. 640 x 400 @ 70Hz, 31.5kHz

4. 640 x 480 @ 50Hz, 24.7kHz

5. 640 x 480 @ 60Hz, 31.5kHz

6. 640 x 480 @ 67Hz, 35.0kHz

7. 640 x 480 @ 72Hz, 37.9kHz

8. 640 x 480 @ 75Hz, 37.5kHz

9. 640 x 480 @ 85Hz, 43.27kHz

10. 720 x 400 @ 70Hz, 31.5kHz

11. 720 x 480 @ 60Hz, 31.5kHz

12. 720 x 576 @ 50Hz, 31.3kHz

13. 800 x 600 @ 56Hz, 35.1kHz

14. 800 x 600 @ 60Hz, 37.9kHz

15. 800 x 600 @ 72Hz, 48.1kHz

16. 800 x 600 @ 75Hz, 46.9kHz

640 x 350 @ 70Hz, 31.5kHz 640 x 400 @ 60Hz, 31.5kHz 640 x 400 @ 70Hz, 31.5kHz 640 x 480 @ 50Hz, 24.7kHz 640 x 480 @ 60Hz, 31.5kHz 640 x 480 @ 67Hz, 35.0kHz 640 x 480 @ 72Hz, 37.9kHz 640 x 480 @ 75Hz, 37.5kHz 640 x 480 @ 85Hz, 43.27kHz 720 x 400 @ 70Hz, 31.5kHz 720 x 480 @ 60Hz, 31.5kHz 720 x 576 @ 50Hz, 31.3kHz 800 x 600 @ 56Hz, 35.1kHz 800 x 600 @ 60Hz, 37.9kHz 800 x 600 @ 72Hz, 48.1kHz 800 x 600 @ 75Hz, 46.9kHz

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

17. 800 x 600 @ 85Hz, 53.7kHz

800 x 600 @ 85Hz, 53.7kHz

18. 832 x 624 @ 75Hz, 49.7kHz

19. 1024 x 768 @ 60Hz, 48.4kHz

20. 1024 x 768 @ 70Hz, 56.5kHz

21. 1024 x 768 @ 72Hz, 58.1kHz

22. 1024 x 768 @ 75Hz, 60.2kHz

23. 1024 x 768 @ 85Hz, 68.67kHz

24. 1152 x 864 @ 75Hz, 67.5kHz

25. 1152 x 870 @ 75Hz, 68.7kHz

26. 1280 x 720 @ 50Hz, 37.5kHz

27. 1280 x 720 @ 60Hz, 45kHz

28. 1280 x 768 @ 50Hz, 39.6kHz

29. 1280 x 768 @ 60Hz, 47.8kHz

30. 1280 x 768 @ 75Hz, 60.3kHz

31. 1280 x 768 @ 85Hz, 68.6kHz

32. 1280 x 960 @ 50Hz, 49.4kHz

33. 1280 x 960 @ 60Hz, 59.7kHz

34. 1280 x 960 @ 75Hz, 75.2kHz

832 x 624 @ 75Hz, 49.7kHz 1024 x 768 @ 60Hz, 48.4kHz 1024 x 768 @ 70Hz, 56.5kHz 1024 x 768 @ 72Hz, 58.1kHz 1024 x 768 @ 75Hz, 60.2kHz 1024 x 768 @ 85Hz, 68.67kHz 1152 x 864 @ 75Hz, 67.5kHz 1152 x 870 @ 75Hz, 68.7kHz 1280 x 720 @ 50Hz, 37.5kHz 1280 x 720 @ 60Hz, 45kHz 1280 x 768 @ 50Hz, 39.6kHz 1280 x 768 @ 60Hz, 47.8kHz 1280 x 768 @ 75Hz, 60.3kHz 1280 x 768 @ 85Hz, 68.6kHz 1280 x 960 @ 50Hz, 49.4kHz 1280 x 960 @ 60Hz, 59.7kHz 1280 x 960 @ 75Hz, 75.2kHz

35. 1280 x 1024 @ 60Hz, 63.4kHz

36. 1280 x 1024 @ 75Hz, 79.97kHz

1.4.2 Function Test Display Pattern

Item Test Content Pattern Specification Remark

1 Frequency & Tracking Fine Line Moire Eliminate visual wavy

2 Contrast/Brightness 16 Gray Scale 16 gray levels should be

3 Boundary Horizontal &

4 RGB Color

Performance

5 Screen Uniformity &

Flicker

6 Dead Pixel/Line White Screen &

7 White Balance White & Black

1280 x 1024 @ 60Hz, 63.4kHz 1280 x 1024 @ 75Hz, 79.97kHz

noise.

distinguishable. Horizontal and Vertical

Vertical Thickness

osition of video should be adjustable to be within the screen frame.

RGB Color Intensities

Contrast of each R, G, B, color should be normal.

Full White Should be compliant with

the spec. The numbers of dead

Dark Screen

pixels should be compliant with the spec. The screen must have the

Pattern

pure white and black pattern, no other color.

Figure 1

Figure 2

Figure 3

Figure 4, 5, 6 Figure 7

Figure 7, 8

Figure 9

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2)

Horizontal & Vertical Thickness Pattern (Figure 3) R. Color Pattern (Figure 4)

G. Color Pattern (Figure5) B. Color Pattern (Figure 6)

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

Full White Patter (Figure 7) Dark Screen Pattern (Figure 8)

Black-White Pattern (Figure 9)

1.5 Function Test and Alignment Procedure

1.5.1 All Modes Reset

You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function Controls) first. This action will allow you to erase all end-user’s settings and restor e the factory defaults.

1.5.2 Auto Image Adjust

Please select and enter “Auto Image Adjust” function on Main Menu to see if it is workable. The “Auto Image Adjust” function is aimed to offer a better screen quality by built-in ASIC. For optimum screen quality, the user has to adjust each function manually.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

1.5.3 Firmware

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

- Make sure the F/W is the latest version.

1.5.4 DDC

Test Pattern: EDID program

- Make sure it can pass test program.

1.5.5 Fine Tune and Sharpness

Test Signal: 1280*1024@60Hz Test Pattern: Line Moire Pattern

- Check and see if the image has noise and focus performs well. Eliminate visual line bar.

- If not, readjust by the following steps: (a) Select and enter “Fine Tune” function on “Manual Image Adjust” to adjust the image to eliminate visual wavy noise. (b) Then, select and enter “Sharpness” function to adjust the clarity and focus of the screen image.

1.5.6 Boundary

Test Signal: 1280*1024@60Hz Test Pattern: Horizontal & Vertical Line Thickness Pattern

- Check and see if the image boundary is within the screen frame.

- If not, readjust by the following steps: (a) Select and enter “Manual Image Adjust” function on OSD Main Menu. (b) Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to adjust the video boundary to be full scanned and within screen frame.

1.5.7 White Balance

Test Signal: 1280*1024@60Hz Test Pattern: White and Black Pattern

1.5.8 R, G, B, Colors Contrast

Test Signal: 1280*1024@60Hz Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern

- Check and see if each color is normal and distinguishable.

- If not, please return the unit to repair area.

1.5.9 Screen Uniformity and Flicker

Test Signal: 1280*1024@60Hz Test Pattern: Full White Pattern

- Check and see if it is in normal condition.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

1.5.10 Dead Pixel and Line

Test Signal: 1280*1024@60Hz Test Pattern: Dark and White Screen Pattern

- Check and see if there are dead pixels on LCD panel with shadow gauge and filter film.

- The total numbers and distance of dead pixels should be compliant with the spec.

1.5.11 Mura

Test Pattern: White, RGB, Black, & Grey Test Tool: 8% ND Filter

- Check if the Mura can pass 8% ND Filter.

1.5.12 Audio

Test Signal: Voice signal (optional, depend on model) Test Pattern: liberty

- Make sure there is audio output.

- Make sure that audio function (volume 80%) is working without noise and resonance.≦

- Make sure that the sound of right and left speakers are in balance.

1.5.13 Check for Secondary Display Modes

Test Signal: Analog: 640*350@70Hz; 640*480@60HZ

720*400@70Hz; 800*600@60HZ/70HZ/75HZ 832*624@75Hz, 1024*768@60HZ/70HZ/75HZ 1280*1024@60/75Hz

Digital: 640*350@70Hz; 640*480@60HZ

720*400@70Hz; 800*600@60HZ/70HZ/75HZ 1024*768@60/70/72/75; 1152*870@75Hz,

1280*1024@60Hz/75HZ

- Normally when the primary mode 1280*1024@60Hz is well adjusted and compliant with the specification, the secondary display modes will be great possible to be compliant with the spec. But we still have to check with the general test pattern to make sure every secondary is compliant with the specification.

1.5.14 All Modes Reset

After final QC step, we have to erase all saved changes again and restore the factory defaults. You should do “All Mode Reset” again.

1.5.15 Power Off Monitor

Turn off the monitor by pressing “Power” button.

ViewSonic Corporation Confidential – Do Not Copy VP920-1_VP920b-1

+ 65 hidden pages