ViewSonic VS11422 User manual

ViewSonic VG2230wm-3
Model No. VS11422
22” Color TFT LCD Display
(VG2230wm-3_SM Rev. 1a May. 2009)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
Service Manual

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Copyright
Copyright © 2008 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.
Product disposal at end of product life
The lamp in this product contains mercury. Please dispose of in accordance with local, state or
federal laws.
Revision History
Revision SM Editing Date Description of Changes TPV Model Editor
1a 05/20/2009 Initial Release TC9MRLDBDWVSDN
TC9MRLDKDWVSDN Eric

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TABLE OF CONTENTS
1. Precautions and Safety Notices ......................................................................................... 4
2. Specification ....................................................................................................................... 6
3. Front Panel Function Control Description ....................................................................... 7
4. Circuit Description ............................................................................................................. 12
5. Adjusting Procedure.......................................................................................................... 24
6. Trouble Shooting Flow Chart ............................................................................................ 33
7. Block Diagrams ................................................................................................................ 34
8. Schematic Diagrams ........................................................................................................ 36
9. PCB Layout Diagrams ...................................................................................................... 45
10. Exploded Diagram and Spare Parts List ........................................................................ 50
11. Recommended Spare Parts List...................................................................................... 61
12. Different Parts List ......................................................................................................... 62

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1. Precautions and Safety Notices
1.1 Safety Precautions
This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper
use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS
before installing and keep this guide handy.
WARNINGS
．This monitor should be operated only at the correct power sources indicated on the label on the rear end of the
monitor. If you’re unsure of the power supply in your residence, consult you local dealer or power company.
．Use only the special power adapter that comes with this monitor for power input.
．Do not try to repair the monitor your self as it contains no user-serviceable parts. This monitor should only be
repaired by a qualified technician.
．Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock to human
bodies, even when the power cord is unplugged.
．Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
．Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable immediately and consult
your service technician.
．Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth. Apply non-ammonia based
cleaner onto the cloth, not directly onto the glass screen.
．Keep the monitor away from magnetic objects, motors, TV sets, and transformer.
．Do not place heavy objects on the monitor or power cord.
1.2 Product Safety Notice
Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection
afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages,
wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of
substitute replacement parts which do not have the same safety characteristics as specified in the parts list may
create shock, fire, or other hazards.
1.3 Service Notes
1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
2. When replacing a high wattage resistor (more than 1W of metal oxide film resistor) in circuit board, keep the
resistor about 5mm away from circuit board.
3. Keep wires away from high voltage, high temperature components and sharp edges.
4. Keep wires in their original position so as to reduce interference.
5. Usage of this product please refer to also user’s manual.

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1.4 Handing and Placing Methods
Correct methods : Incorrect Methods :
Only touch the metal-frame of the panel or the front
cover of the monitor.
Do not touch the surface of the polarizer .
Surface of the panel is pressed by fingers & this may
cause “ MURA “
Take out the monitor with cushion Take out the monitor by grasping the LCD panel.
That may cause “ MURA“.
Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .
That could scratch the surface of panel

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2. Specification

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

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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, press ▲or ▼to 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 control, press the up ▲or down ▼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 1680 x 1050 @ 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.)
The command line at the bottom of the
control screen tells what to do next from
this screen. You can toggle between
control

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Main Menu Controls
Adjust the menu items shown below by using the up ▲and down ▼buttons.
Control Explanation
Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate
waviness and distortion. Press the [2] button to obtain a sharper image.
NOTE: Auto Image Adjust works with most common video cards. If this function does not work on
your LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set
value.
Contrast adjusts the difference between the image background (black level) and the foreground
(white level).
Brightness adjusts background black level of the screen image.
Input Select toggles between inputs if you have more than one computer connected to the LCD
Display.
Audio Adjust
Volume 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).
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.
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, press ▲and ▼.
Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing

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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 1920 x 1080 @ 60Hz (recommended) means that the resolution is 1920 x 1080 and
the refresh rate is 60 Hertz.
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.
H. Size (Horizontal Size) adjusts the width of the screen image.
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.
Aspect ratio Selects the image size for 4:3 and full screen.
ECO Mode provides the lower power consumption by reducing the brightness.
Standard: The default brightness setting.
Optimize: Decreases the brightness by 25 %.
Conserve: Decreases the brightness by 50 %.
NOTE: When the ECO Mode is set to "Optimize" or "Conserve", the Brightness, Contrast, and
Dynamic Contrast cannot be adjusted.

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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 advises the optimal resolution to use.
If you enable the Resolution Notice shown above and your computer is set at a resolution other
than 1680 x 1050, the following screen appears.
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.

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4. Circuit Description
4.1 Main Board
General
■Embedded dual DDC with DDC1/2B/CI
■Zoom scaling up and down
■No external memory required.
■Require only one crystal to generate all timing.
■Programmable 3.3V/5V detection reset output.
■Embedded crystal output to micro-controller.
■3 channels 8 bits PWM output, and wide range
selectable PWM frequency.
Analog RGB Input Interface
■Integrated 8-bit triple-channel 210/165 (optional)
MHz ADC/PLL
■Embedded programmable Schmitt trigger of
HSYNC
■Support Sync On Green (SOG) and various kinds
of composite sync modes
■On-chip high-performance hybrid PLLs
■High resolution true 64 phase ADC PLL
■Y/Pb/Pr support up to HDTV 1080i resolution
■Support 1 Analog input
Digital Video Input Interface
■Built-in YUV to RGB color space converter &
de-interlace
DVI Compliant Digital Input Interface
(optional)
■Single link on-chip TMDS receiver
■Support to 165Mhz with long cable
■Adaptive algorithm for TMDS capability
■Data enable only mode support
■High-Bandwidth Digital Content Protection
(HDCP 1.1) (optional only in H version)
■Enhanced protection of HDCP secret key
(optional only in H version)
Auto Detection /Auto Calibration
■Input format detection
■Compatibility with standard VESA mode and
support user-defined mode
■Smart engine for Phase/Image position/Color
calibration
Scaling
■Fully programmable zoom ratios
■Independent horizontal/vertical scaling
■Advanced zoom algorithm provides high image
quality
■Sharpness/Smooth filter enhancement
■Support non-linear scaling from 4:3 to 16:9 or
16:9 to 4:3
Vivid Color™
■Dynamic Contrast Control (DCC)
■Independent Color Management (ICM)
Scalar--- RTD2554VH-GR (U6)
■True 10 bits color processing engine
■sRGB compliance
■Advanced Dithering logic for 18-bit panel color
depth enhancement
■Dynamic overshoot-smear canceling engine
■Brightness and contrast control
■Programmable 10-bit gamma support
Output Interface
■Fully programmable display timing generator
■Flexible data pair swapping for easier system
design.
■Programmable TCON function support
■RSDS-output interface on single PCB
■Spread-Spectrum DPLL to reduce EMI
■Fixed Last Line output for perfect panel
capability
Host Interface
■Support MCU serial/parallel bus interface.
■Support MCU dual edge data latch.
Embedded OSD
■Embedded 12K SRAM dynamically stores OSD
command and fonts
■Support multi-color RAM font, 1, 2 and 4-bit per
pixel
■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
■Rotary 90,180,270 degree
■Independent row shadowing/bordering
■Programmable blinking effects for each character
■OSD-made internal pattern generator for factory
mode
■Support 12x18~4x18 proportional font
■Decompress OSD font
Power & Technology
■3.3V power supplier
■0.18um CMOS process, 128-pin QFP package

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Block Diagram

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Pin Description
Input Port
Name I/O No Description Note
AVS0 I 19 1st ADC vertical sync input
Power from PIN 13
no power 5V
tolerance
AHS0 I 20 1st ADC horizontal sync input
Adjustable Schmidt trigger
Power from PIN 13
no power 5V
tolerance
ADC_VDD AP 21 ADC Power (1.8V)
ADC_GND AG 22 ADC Ground
B0- AI/I 30 Negative BLUE Analog input (Pb-) 3.3 tolerance
B0+ AI/I 31 Positive BLUE Analog input (Pb+) 3.3 tolerance
G0- AI/I 32 Negative GREEN analog input (Y-) 3.3 tolerance
G0+ AI/I 33 Positive GREEN analog input (Y+) 3.3 tolerance
SOG0 AI/I 34 Sync on Green 3.3 tolerance
R0- AI/I 35 Negative RED analog input (Pr-) 3.3 tolerance
R0+ AI/I 36 Positive RED analog input (Pr+) 3.3 tolerance
ADC_GND AG 37 ADC Ground
ADC_VDD AP 38 ADC Power (1.8V)
PLL
Name I/O Pin No Description Note
APLL_GND AG 1 Ground for multi-phase PLL
APLL_VDD AP 2 Power for multi-phase PLL 3.3V
PLL_TEST1_HIGH I/O 3 Test Pin 1
Power-on-latch for MCU crystal location
PLL_TEST2 I/O 4 Test Pin 2 M2PLL
XO AO 127 Crystal OSC output
XI AI 128 Reference clock input from external crystal
or from single-ended CMOS/TTL OSC
3.3V
tolerance
Host interface
Name I/O Pin No Description Note
SDIO[0] I/O 112 Parallel port data [0] (Open drain)LSB 5V tolerance
SDIO[1] I/O 113 Parallel port data [1] (Open drain) 5V tolerance
SDIO[2] I/O 114 Parallel port data [2] (Open drain) 5V tolerance
SDIO[3] I/O 115 Serial control I/F data in or Parallel port
data [3] (Open drain) MSB
5V tolerance
SCSB I 118 Serial control I/F chip select 5V tolerance
SCLK I 119 Serial control I/F clock 5V tolerance

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TMDS (optional)
Name I/O Pin No Description Note
TMDS_TST AIO 5 TMDS_TEST Pin
Power-on-latch for host interface type
REXT AI 6 Impedance Match Reference.
TMDS_VDD AP 7 TMDS power (3.3V)
RX2P AI 8 Differential Data Input
RX2N AI 9 Differential Data Input
TMDS_GND AG 10 TMDS ground
RX1P AI 11 Differential Data Input
RX1N AI 12 Differential Data Input
TMDS_VDD AP 13 TMDS power (3.3V)
RX0P AI 14 Differential Data Input
RX0N AI 15 Differential Data Input
TMDS_GND AG 16 TMDS ground
RXCP AI 17 Differential Data Input
RXCN AI 18 Differential Data Input
Pad/Digital Power & Ground
Name I/O Pin No Description
PVCC P 59/83/108 Pad 3.3V Power
PGND G 60/84/107 Pad 3.3V Ground
VCCK P 47/116 Digital 1.8V Power
GNDK G 46/117 Digital 1.8V Ground
6-bit RSDS Display Interface
Name I/O No Description
BB3P O 61
BB3N O 62
BB2P O 63
BB2N O 64
BB1P O 65
BB1N O 66
BCLKP O 67
BCLKN O 68
BG3P O 69
BG3N O 70
BG2P O 73
BG2N O 74
BG1P O 75
BG1N O 76

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BR3P O 77
BR3N O 78
BR2P O 79
BR2N O 80
BR1P O 81
BR1N O 82
AB3P O 85
AB3N O 86
AB2P O 87
AB2N O 88
AB1P O 89
AB1N O 90
ACLKP O 91
ACLKN O 92
AG3P O 93
AG3N O 94
AG2P O 97
AG2N O 98
AG1P O 99
AG1N O 100
AR3P O 101
AR3N O 102
AR2P O 103
AR2N O 104
AR1P O 105
AR1N O 106
Timing Controller
Name I/O No Description
TCON0 O 48 Refer to Pin share part.
TCON1 O 49
TCON2 O 111
TCON4 O 44/50/121
TCON5 O 42/114
TCON6 O 120
TCON7 O 41/111
TCON8 O 44/113
TCON9 O 51/122
TCON10 O 42/112
TCON11 O 43/120
TCON13 O 52/110

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DDC Channel
Name I/O No Description
DDCSCL1(ADC) I 50 Open drain, no power 5V tolerance
DDCSDA1(ADC) I/O 51 Open drain, no power 5V tolerance
DDCSCL2(DVI) I 121 Open drain, no power 5V tolerance
(optional)
DDCSDA2(DVI) I/O 120 Open drain, no power 5V tolerance
(optional)
PWM
Name I/O No Description
PWM0 O 122
PWM1 O 48/111
PWM2 O 49
MISC
Name I/O No Description
RESET O 123 Reset out
Open drain (Internal 75KOhm high), 5V tolerance
3.3V_REF I 124 Reference 3.3V for Reset Out

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MCU--- RTD2120L-LF (U3)
Overview
This chip is the micro-processor of LCD monitor. It uses the design ware DW8051 of Synopsys as the 8051 core of
this chip and is compatible with other industry 8051 series. Also, 96Kbyte FLASH with 8 bit bus is embedded in this
chip which is licensed from TSMC 0.18um e-FLASH process. Here we use the package of PLCC44/LQFP48 if we
would like to have a discrete MCU controller or we make a multi-chip package with our LCD monitor controller to
form one chip package to save the cost of package and PCB material.
Features
• Operating voltage range : 3.0V to 3.6V
• 8051 core, CPU operating frequency up to 50MHz
• 4 clocks per machine cycle
• 256-byte internal RAM
• 512-byte external data RAM, including 256-byte DDC RAM(128-byte x 2) and 256-byte general purpose RAM
• 96K-byte flash memory, 64k for program and 32k for saving parameter
• Two DDC ports Compliant with VESA DDC1/2B/2Bi/CI
• Three channels of PWM DAC with programable frequency from 100K to 100Hz
• Watchdog timer with programmable interval
• Three 16-bit counters/timers (T0, T1, and T2)
• One PLL to provide programmable operating frequency and clock output, 2 clock output ports
• One full-duplex serial port
• Six interrupt sources with 2 external interrupts
• Four channels of 6-bit ADC
• Hardware In System Programming(ISP) capability, no boot code required
• Built-in Low voltage reset circuit
• Embedded 1.8V regulator
• Code protection
• Available in 44-pin PLCC or 48-pin LQFP package

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Application Block Diagram

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Pin Description
Pin No. Name I/O
Internal
Pull
Up/Down
Default
output
value
Pin Type Description
PLCC LQFP
2 44 P5.0/PWM0 I/O -- 1(P5.0) Open Drain
General purpose
I/O / PWM0
output
3 45 P5.1/PWM1 I/O -- 1(P5.1) Open Drain
General purpose
I/O / PWM1
output
4 46 P5.2/PWM2 I/O -- 1(P5.2) Open Drain
General purpose
I/O / PWM2
output
5 47 P5.3/PWM3 I/O -- 1(P5.3) Open Drain
General purpose
I/O / PWM3
output
6 48 P5.4/PWM4 I/O -- 1(P5.4) Open Drain
General purpose
I/O / PWM4
output
7 1 P5.5/PWM5 I/O -- 1(P5.5) Open Drain
General purpose
I/O / PWM5
output
8 2 P5.6/DSCL I/O -- 1(P5.6) Open Drain
General purpose
I/O / DVI DDC
SCL
9 3 P5.7/DSDA I/O -- 1(P5.7) Open Drain
General purpose
I/O / DVI DDC
SDA
10 4 RST I Down 0 Input High active
RESET
11 5 ASCL/P3.0/RXD I/O -- 1(ASCL) Open Drain
ADC DDC SCL /
General purpose
I/O / RXD
13 8 ASDA/P3.1/TXD I/O -- 1(ASDA) Open Drain
ADC DDC SDA /
General purpose
I/O / TXD
14 9 P3.2/INT0 I/O -- 1(P3.2) Standard 8051
General purpose
I/O / External
interrupt 0