Viewsonic VX2240W-4 Service Manual
Service Manual
ViewSonic VX2240W-4
Model No. VS11985
22” Color TFT LCD Display
(Manufacture date: NOV. 2008)
VX2240W-4
1
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 ECR Number Description of Changes Editor
Initial Release
TC6MNBDTNWVWN
TC6MNBDTNWVWNND
A01 NOV. 08
TC6MNBHKNWVSN
TC6MNBHKNWVSNND
TC6MNBDDNWVSNNN
TC6MNBDDNWVSNND
2
TABLE OF CONTENTS
1. Precautions and Safety Notices..........................................................................................1
2. Specification .......................................................................................................................2
3. Front Panel Function Control Description .......................................................................4
4. Circuit Description .............................................................................................................9
5. Adjusting Procedure..........................................................................................................16
6. Trouble Shooting Flow Chart............................................................................................21
7. Block Diagrams .................................................................................................................22
8. Schematic Diagrams ........................................................................................................23
9. PCB Layout Diagrams ......................................................................................................31
10. Exploded Diagram and Spare Parts List.........................................................................33
11. Recommended Spare Parts List ....................................................................................34
12. Different parts list ...........................................................................................................45
1
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 cableimmediately 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
When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
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.
Keep wires away from high voltage, high temperature components and sharp edges.
Keep wires in their original position so as to reduce interference.
Usage of this product please refer to also user’s manual.
2
2. Specification
2.1 Product specifications
Region
Product Name VX2240w
Model Number VS11985
OSD Languages
TFT LCD Panel and Model # CMO A220Z5
Scalar Model # : Novatek NT68670HTFG
Input Signal D-Sub / DVI-D
Sync Compatibility Separate / Composite / SOG
Power Consumption Built-in/ under 55W (max) / 45W(typ)
Power Cable Refer to Appendix G
Analog Cable (1.8 m, color : black), with
PC 2001 and Hot Plug Detect &DDC
DVI-D Cable / 1.8m YES
VSA VSAP VSE VSCN
(M) (A) & (K) (EU) (G)
English, French, German, Italian, Spanish, Finnish,
Russian, Korean, Japanese, Traditional Chinese,
Simplified Chinese
YES
ViewSonic CD Wizard
ViewSonic Quick Start Guide
Screen Protector Mylar YES
Extrme Label (up to 2ms) YES
Service Insert (new version) YES NO NO NO
Warranty Sticker NO NO NO NO
Warranty Card NO NO NO YES
Carton Sticker NO NO NO YES
PE bag of Carton NO NO NO YES
Arabic, English, Finnish, Spanish, German,
Italian, Japanese, Swedish, Polish, Korean
Portuguese, Russian, French, Greek, Dutch,
Turkish, Simplified Chinese, Traditional Chinese,
Czech, Hungarian
3
2.2 Interface description
15 pin D-sub connector pin assignment
1 5
6
11 15
10
Pin Number
1 Red video input
2 Green video input
3 Blue video input
4 No Connection
5 Ground
6 Red video ground
7 Green video ground
8 Blue video ground
9 +5V
10 H/V sync ground
11 No connection
12 (SDA)
13 Horizontal sync (Composite sync)
14 Vertical sync
Pin Function
15 (SCL)
4
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”
5 6
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).
7
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, pressand.
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 1680 x 1050 @ 60Hz (recommended) means that the resolution
is 1680 x 1050 and the refresh rate is 60 Hertz.
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.
Dynamic Contrast allows the user to turn the contrast ratio
enhancement on or
off.
Aspect ratio Selects the image size for 4:3 & full screen.
Response Time adjusts the response time of liquid-crystal display
for image
quality enhancement.
8
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.
OSD Position allows the user to move the OSD menus and
control screens.
OSD Timeout sets the length of time the OSD screen is displayed. For
example,
with a “15 second” setting, if a control is not pushed within 15
seconds, the
display screen disappears.
OSD Background allows the user to turn the OSD background
On or Off.
Memory Recall returns the adjustments back to factory settings
if the display is
operating in a factory Preset Timing Mode listed in the
Specifications of this
manual.
Exception: This control does not affect changes made with the
User Color control, Language Select or Power Lock setting.
9
4. Circuit Description
EEprom
EEprom
Scaler
NT68670HTFG
EEprom
24C16
OSD control
D _SUB
LCD panel
DVI
board
The NT68670 is a highly integrated flat panel display controller that interfaces analog, digital,
and video inputs. It combines a triple ADC, a DVI compliant TMDS receiver, a digital YUV
receiver, a high quality zoom and shrink engine , a multi-color on screen display (OSD)
controller , an advanced color engine ,an liquid crystal display accelerator over – driving that
embedded 1Mx16 SDRAM and many other functions in a single chip. It provides the user with a
simple, flexible and cost-effective solution for various flat panel display products.
The NT68670 operates at frequencies up to 170MHz, suitable for LCD monitor up to UXGA
resolution.The NT68670 also has a built-in noise reduction function to provide more stable video
quality, spread spectrum to provide low EMI solution, sRGB for video color space convert and
post pattern for manufacture test.
The display provided multi-interface with timing controller or without timing controller. With
timing controller provided single/double pixel clock RSDS interface; without timing controller
provide single/double pixel clock LVDS interface.
In addition, NT68670 includes an integrated 8-Bit Microcontroller (MCU). It contains an
8-bit 8031 micro-controller, 1,280-bytes internal data memory, four 7-bit resolution A/D
Converter, 10-channel
8-bit resolution PWM DAC, two16-bit timer/counters, and a UART. Except those, it has
two-channel hardware DDC solution, and VESA 2Bi/2B+ master/slave I2C bus interface.
10
Writer Ver 3.0
Setp1:
Setup EasyUSB WriterV3.0.exe
11
Setp2:
Enter :
12
13
Step 3 :
Find Writer in this program.
Step 4 :
OptionàConfigurationàCHIMEIàConfirm change
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