VSC NX2240w-E Manuale utente
22″LCDTV VSCNX2240w-E
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Service
Service
Service
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
8.PCB Layout…………………….……….…….....76
8.1 Main Board…………….……………....….......76
8.2 Power Board…………………….....….......78
8.3 IR Board...…................................................79
8.4 Tuner Board……..………................................80
8.5 Key Board……………................…….........80
9. Block Diagram........................….......................81
10. Schematic Diagram.…....………………….......82
10.1 Main Board……………….........................82
10.2 Power Board...……………………………...94
10.3 IR Board…………..………………………96
10.4 Tuner Board...….........................................97
10.5 Key Board…….…….................................101
11. Exploded View…….....................................102
12. PPL………………………….……………..….103
13. BOM List….………………………………….104
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
Precautions and Safety Notices…………............……......3
1.General Specifications..............................………........6
2.Operating Instructions…………………….……….......7
2.1.RCU Code……………….…..…………..................7
2.2 Front Panel Control Knobs.....................…...........10
2.3 OSD Operating…………….…............……...............11
2.4 How To Connect...………........................…............14
3.Input/Output Specification............……………............18
3.1 Input Signal Connector............………….................18
3.2 Factory Preset Display Modes..................................19
4. Circuit Description…………………………...………….20
5. Adjusting Procedure…………………………..………..51
6.Mechanical Instructions.....……......................66
7.Repair Flow Chart.……………………..................71
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Revision List
Version Release Date Revision History TPV Model
A00 Sep-28-2007 Initial Release E227ANNBBWVWNN
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Precautions and Safety Notices
1. Appropriate Operation
(1) Turn off the product before cleaning.
(2) Use only a dry soft cloth when cleaning the 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 Multimedia TV off.
(6) Do not touch the panel surface with sharp or hard objects.
(7) Do not place heavy objects on the Multimedia TV, 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 Multimedia TV 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. Multimedia TV 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 Multimedia TV.
(11) After installation of the Multimedia TV into an enclosure, do not twist nor bend the Multimedia TV even
momentary. At designing the enclosure, it should be taken into consideration that no bending/twisting forces are
applied to the Multimedia TV from outside. Otherwise the Multimedia TV may be damaged.
(12) Cold cathode fluorescent lamp in Multimedia TV 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 Multimedia TV.
The Multimedia TV should be supplied by power complied with requirements of limited Power Source, or be
applied exemption.
(14) The Multimedia TV is designed so that the CFL in it is supplied by Limited Current Circuit. Do not connect the
CFL in Hazardous Voltage Circuit.
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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.
Surface of the LCD panel is pressed by fingers and
that may cause “Mura”
Take out the monitor with cushions Taking out the monitor by grasping the LCD panel.
That may cause “Mura”
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Place the monitor on a clean and soft foam pad. Placing the monitor on 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”
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1. General Specifications
Items Specification
LCD Panel
Screen Size 22” TFT-LCD Panel
Resolution 1680 x 1050 pixels
TV Function
TV
Tuning
System
Analog PAL/SECAM
Sound
System Analog Nicam / A2
Teletext Yes (10 Pages)
Color systems PAL / SECAM
Video Inputs
SCART (RGB+CVBS) x1
AV1 RCA(Composite) x 1
Audio L/R x 1 (Share)
S-Video S-Video x 1
Component Component x1 (share
with D-sub )
Audio L/R×1 (Share with PC
Audio )
HDMI HDMI x 1
PC mode
Signal input Analog: D-Sub 15 pins (separate)
Plug and play
compatible DDC 2B
Recommended Analog: 1680x1050 (60Hz)
Audio input Used as a stereo earphone mini jack (3.5 ø)
Audio
Output Audio output: L/R Speaker (built-in): 2*3 watt speakers
Headphone: Mini-jack for stereo (3.5ø)
OSD
language
English/French/German/Spanish/Russian/Italian/Finnish/
Swedish/Danish/Norwegian
Power Power supply 100-240V ~50/60Hz
Power
Consumption Power-on<75W; Power saving-off<2W
Wall Mount
dimension VESA: 100*100 mm
Dimension W x H x D (with
stand) 539mmx447mmx209mm
Accessories Remote Control, Batteries, CD wizard, QSG, AV Power cord, VGA to
Component cable, PC Audio to RL cable, AV cable( for Asia use)
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2. Operations Instructions
2.1 RCU Code
Key Label DATA CODE
POWER 0C
Vol +/ RIGHT 10
Vol -/LEFT 11
Ch +/UP 20
Ch - /DOWN 21
RECALL 22
Mute 0D
1 01
2 02
3 03
4 04
5 05
6 06
7 07
8 08
9 09
0 00
Enter 0A
Menu/OSD 2E
TELETEX 3C
Guide 78
Source 28
TV/DTV 4B
SCART 39
HDMI/PC 38
AV/COMP 79
Red 37
Green 36
Yellow 32
Blue 34
PIP/POP (PIP/on or
of 58
PIP/Position 59
PIP/SWAP 5A
-/100 0B
Index 6F
Sub-page 18
REVEAL 19
Display 12
NICAM 23
Wide 7E
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2.2 Front Panel Control Knobs
Vol(▲):When the OSD menu appears, press these two buttons to confirm the selected item; when no OSD menu
appears, use to adjust the volume.
CH(▲): When the OSD menu appears, press these two buttons to select the item you want to execute; when no
OSD menu appears, use to change channels in TV mode.
Menu : Press this button to display or exit the OSD menu.
Input : Press this button to change input source.
Power : Press this button to turn on the TV or allow the TV to enter standby mode.
If the TV is in standby mode, the indicator at the front will illuminates amber. There is a wide range of video and
audio equipment that can be connected to your TV. The following connection diagrams show you how to connect
them. ViewSonic 12 NX1940w/NX2240w
Indice
