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Service Manual
ViewSonic VX2240W-4
Model No. VS11985
22" Color TFT LCD Display




(Manufacture date: NOV. 2008)
VX2240W-4
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




1
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




2
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.




1
2. Specification
2.1 Product specifications
VSA VSAP VSE VSCN
Region
(M) (A) & (K) (EU) (G)
Product Name VX2240w
Model Number VS11985
English, French, German, Italian, Spanish, Finnish,
OSD Languages Russian, Korean, Japanese, Traditional Chinese,
Simplified Chinese
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
YES
PC 2001 and Hot Plug Detect &DDC
DVI-D Cable / 1.8m YES
Arabic, English, Finnish, Spanish, German,
ViewSonic CD Wizard
Italian, Japanese, Swedish, Polish, Korean
Portuguese, Russian, French, Greek, Dutch,
ViewSonic Quick Start Guide Turkish, Simplified Chinese, Traditional Chinese,
Czech, Hungarian
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




2
2.2 Interface description
15 pin D-sub connector pin assignment



1 5
6 10
11 15




Pin Number Pin Function
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
15 (SCL)




3
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"




4
5
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).




6
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 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.



7
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.




8
4. Circuit Description


Scaler
EEprom NT68670HTFG EEprom
24C04 24C16


EEprom
24C02
D _SUB DVI




OSD control LCD panel
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.




9
Writer Ver 3.0




Setp1:
Setup EasyUSB WriterV3.0.exe




10
Setp2:
Enter :




11
12
Step 3 :
Find Writer in this program.




Step 4 :
OptionąConfigurationąCHIMEIąConfirm change




13
The IIC speed catches by
program.




Choose tools for CMO




Step 5 :
Print to D-Sub and DVI-D




Link Monitor which is update




Link PC




Step 6 :
BIOS update:
Load FileąAutoąFinish


14
15
5. Adjustment Procedure
1. All Modes Reset
You should do "All Model Reset" (Refer to Chap 3. Hot Keys for
Function Controls) first. This action will allow you to erase all
end-user's settings and restore the factory defaults.


2. Auto Image Adjust
The Auto Adjust is aimed to offer a best screen quality by built-in
ASIC. For optimum screen quality, the user has to adjust each
function manually.

A.Turn the computer and LCD monitor on.
B. Press the `Auto' button on monitor keypad to Auto Adjust.
C. The LCD monitor will start the Auto Adjust process automatically and
run for 10 consecutive seconds, during which time you will notice the
image change.
3. Firmware
Test Patten: Burn in Model (Refer to Chap3. Hot Keys for Function
Control)
-Make sure the F/W is the latest version.


4. DCC
Test Patten: EDID program

-Make sure it can pass test program.


5. Window Shut Down
Test Signal: 1280*[email protected]
Test Pattern:



Checkered Pattern Every One Pixel (50%Green & 50%Blue)
Inspection Item: Flicker, Mura


6. Window BG
Test Signal: 1280*[email protected]
Test Pattern:




Window standard pattern
Inspection Item: Line Defect, Function Defect & Mura



16
7. 25 Gray
Test Signal: 1280*[email protected]
Test Pattern:




Full Screen 25% White (Gray)
Inspection Item: Particle, Line Defect & Mura


8. 50 Gray
Test Signal: 1280*[email protected]
Test Pattern:




Full Screen 50% White (Gray)
Inspection Item: Bright Dot, Particle, Line Defect & Mura


9. White Box
Test Signal: 1280*[email protected]
Test Pattern:




Window standard pattern
Inspection Item: Particle, Line Defect, Power, Image Remain & Mura



10. Black Box
Test Signal: 1280*[email protected]
Test Pattern:




Window standard pattern
Inspection Item: Bright Dot, Line Defect & Power




17
11. RED
Test Signal: 1280*[email protected]
Test Pattern:




Full Screen Red
Inspection Item: Bright Dot, Partial & Line Defect


12. Green
Test Signal: 1280*[email protected]
Test Pattern:




Full Screen Green
Inspection Item: Bright Dot, Partial & Line Defect


13. Blue
Test Signal: 1280*[email protected]
Test Pattern:




Full Screen Green
Inspection Item: Bright Dot, Partial & Line Defect



14. Gray_Scale_0-100_V64
Test Signal: 1280*[email protected]
Test Pattern:




Vertical 64 (256) Gray Scale (Right LeftFrom 0 to 100% White)
Inspection Item: Line Defect & Function Defect


Function Test Display pattern




18
Item Pattern Description Remark

Vertical 64 (256) Gray Scale ( From 0 to
1 Gray_Scale_0-100_V Figure 1
100% White)
Horizontal 64 (256) Gray Scale (From
2 Gray_Scale_0-100_H Figure 2
0 to 100% White)
3 Black Full Screen Black Figure 3
4 Red Full Screen 50% Red Figure 4
5 Green Full Screen 50% Green Figure 5
6 Blue Full Screen 50% Blue Figure6
7 White Full Screen White Figure7
8 Black_Tile Black Tile Under White Background Figure 8




Figure 1
Figure 2




Figure 3 Figure 4




19
Figure 5 Figure 6




Figure 8
Figure 7




20
6. Troubleshooting

No power
· Make sure power button (or switch) is ON.
· Make sure A/C power cord is securely connected to the LCD display.
· Plug another electrical device (like a radio) into the power outlet to verify
that the outlet is
supplying proper voltage.

Power is ON but no screen image
· Make sure the video cable supplied with the LCD display is tightly secured to the
video
output port on the back of the computer. If the other end of the video cable is
not attached
permanently to the LCD display, tightly secure it to the LCD display.
· Adjust brightness and contrast.
· If you are using an Macintosh older than G3, you need a Macintosh adapter.

Wrong or abnormal colors
· If any colors (red, green, or blue) are missing, check the video cable to make
sure it is
securely connected. Loose or broken pins in the cable connector could cause an
improper
connection.
· Connect the LCD display to another computer.
· If you have an older graphics card, contact ViewSonic® for a non-DDC
adapter.

Control buttons do not work
· Press only one button at a time.




21
7. Block Diagram



Power 24C16 24C04 24C02 24C02
Inveter System for HDCP VGA DVI
LVDS
Out



Audio MCU + Scaler
APA2068 NT68665




KBoard VGA DVI




22
TOP
Main board
8. Schematic Diagrams




B3
B1




VGA_SDA
VGA_SDA VGA_SCL VGA_SDA
VGA_SCL VGA_SCL
SOGI
SOGI BI1 SOGI
BI1 GI1 BI1
GI1 RI1 GI1
RI1 BI1- RI1 +5V
02_VGA




BI1- GI1- BI1-




B6
GI1- RI1- GI1-
RI1- RI1-




+5V
HSIN
HSIN VSIN HSIN




ADC_VAA
VSIN VSIN
ADC_VAA




ADC_VAA
ADC_VAA
RX2-
RX2- RX2+ RX2- V33S
B4




RX2+ RX1- RX2+ V33S DVDD V33S
RX1- RX1+ RX1- DVDD VGA_3V3 DVDD
RX1+ RX0- RX1+ VGA_3V3 VGA_3V3
RX0- RX0+ RX0- INV_ADJ
ADC_VAA




RX0+ RXC- RX0+ INV_ADJ INV_ON/OFF INV_ADJ
RXC- RXC+ RXC- INV_ON/OFF INV_ON/OFF
RXC+ RXC+ LED_ORG
DVI_SCL LED_ORG LED_GRN LED_ORG
DVI_SCL DVI_SDA DVI_SCL LED_GRN PWR_SW LED_GRN
DVI_SDA DVI_SDA PWR_SW MENU PWR_SW
MENU KEY_UP MENU
KEY_UP KEY_DOWN KEY_UP
KEY_DOWN AUTO_ADJ KEY_DOWN
AUTO_ADJ AUTO_ADJ
04_INTERFACE




DVI_HPD SOURCE_SELECT
DVI_HPD DVI_HPD SOURCE_SELECT SOURCE_SELECT




23
B_D[0..19]




06_DVI
B_D[0..19] B_D[0..19]
+5V




F_D[0..19]
03_SCALER




F_D[0..19] FSTHI F_D[0..19] +5V
FSTHI BSTHI FSTHI
BSTHI STB BSTHI
STB POL STB
POL STV POL
STV CKV STV
CKV OE CKV
OE VCM_PWM OE
VCM_PWM GVON VCM_PWM
GVON GVON
PANEL_ON
PANEL_ON PANEL_ON
MCU_VDD
MCU_VDD MCU_VDD
LIPS_5V




SPK_L-
SPK_R-
SPK_L+
SPK_R+




CVDD1V8
CVDD1V8 CVDD1V8
SPK_L-
SPK_R-
SPK_L+
SPK_R+
LIPS_5V




CVDD1V8
B5




SPK_L-
SPK_R-
SPK_L+
SPK_R+
LIPS_5V




MUTE
MUTE AMP_SHDN MUTE
AMP_SHDN VOL_PWM AMP_SHDN
VOL_PWM VOL_PWM
05_AUDIO
VGA
B1
100M/33ohm
VGA_5V +5V VGA_VDD
VGA_SCL 1 VSCL RAI+ 1 2 R1 0402/56R/1% C1 0402/47n/16V/Y RI1
TP RI1 3
+5V 4,5
BK1608HS330




1

2
D1 VGA_SDA 1 VSDA
TP




3
1 R3
BAV70W /RoHS D2 0402/75R/1%

3
U1 R2 NC/BAV99/RoHS
1 8 0402/3.9K/5%
2 NC VCC 7 VGA_5V
3 NC WP 6 VGA_SCL RAI- R4 0402/100R/1% C2 0402/47n/16V/Y RI1-




2
4 NC SCL 5 VGA_SDA RI1- 3
GND SDA
AT24C02B-10TU-1.8/RoHS C3 C4
NC/0402/100n/16V/Y
GND_POWER
0402/100n/16V/Y
CA1
R5 0402/470R/1%
GND_POW ER SOGI
SOGI 3
GND_POW ER
B2 0402/1n/16V/7
GAI+ 1 2 R6 0402/56R/1% C5 0402/47n/16V/Y GI1
GI1 3 R7
11 1 RAI+ BK1608HS330 NC/0402/1M/1%
6 RAI-




3
VGA_SDA 12 2 GAI+
7 GAI- 1 R8
HSI 13 3 BAI+ D3 0402/75R/1%
8 BAI- NC/BAV99/RoHS GND_POW ER
VSI 14 4
9
VGA_SCL 15 5 GAI- R9 0402/100R/1% C6 0402/47n/16V/Y GI1-




2
10 GND_POW ER GI1- 3

CN1 C7
MLX89263-6762/RoHS NC/0402/100n/16V/Y


GND_POW ER
GND_POW ER
B3
BAI+ 1 2 R10 0402/56R/1% C8 0402/47n/16V/Y BI1
BI1 3
BK1608HS330




3
VGA_5V
1 R11
D4 0402/75R/1%
NC/BAV99/RoHS
2




Z1 BAI- R12 0402/100R/1% C9 0402/47n/16V/Y BI1-




2
BI1- 3

NC/UDZSF-5.6B/RoHS C10
1




NC/0402/100n/16V/Y ADC_VAA

GND_POWER

GND_POW ER R13 NC/0402/0R/5% ADC_VAA 3,4,5




2
Z2
C11
NC/UDZSF-1.9V 1 NC/0603/10u/6.3V/5/B


GND_POWER GND_POWER




VSI R15 0402/100R/5% HSI R16 0402/100R/5%
VSIN 3 HSIN 3
2




2
Z3 R14 Z4 R17
C12 C13
0402/2.2K/5% 0402/100p/50V/N NC/UDZSF-5.6B/RoHS 0402/2.2K/5% 0402/22p/50V/N
NC/UDZSF-5.6B/RoHS
1




1
GND_POWER GND_POW ER GND_POW ER
GND_POW ER GND_POWER GND_POWER




VGA_VDD
VGA_VDD



R18
R19
0402/4.7K/5%
0402/4.7K/5%


VGA_SCL VGA_SDA
VGA_SCL 3 VGA_SDA 3
2




2




Z5 Z6

NC/UDZSF-5.6B/RoHS
1




1




NC/UDZSF-5.6B/RoHS



GND_POW ER GND_POW ER




24
scaler
VGA_3V3
AD C _VAA
C VD D 1V8 PVCC
VGA_3V3 2,4,5
6 15 C VD D1V8 ADC _VAA VGA_3V3 D VDD 17 26 ADC _VAA 2,4,5
Option for NT68670




1
C14 C 15 C16 C 17
D VD D 0402/100n/16V/Y 0402/100n/16V/Y B14 GN D_POW ER B4 0402/100n/16V/Y 0402/100n/16V/Y C 63
DVD D 2,4,5




2
MCB1608S601EA 0603/10u/6.3V/5/B
0603/0R/R oHS




2
53 90




+
C62




PVCC 1
C18 C 19 UW T1C 221MC L1GS




DPLL
0402/100n/16V/Y 0402/100n/16V/Y C 20 GND _POWER
GND _POWER
0402/100n/16V/Y GN D_POW ER




115




101
45




43


52



26


15

17


53
90


27

12
18

78
64
U2




6




9
B_D [0..19]
B_D [0..19] 4
GND _POWER




AD C_VAA




ADC _GN DA



D GND /C GND
D GND /C GND