ViewSonic N1930w-2M Manuel utilisateur

Service Manual

ViewSonic N1930w-2M

Model No. VS12115-2M

19” LCD TV

(N1930w-2M_SM Rev. 1aJun.2008)

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

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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 06/26/08Initial Release Sophia Kao

All other trademarks used within this document are the property of their respective owners.

The lamp in this product contains mercury. Please dispose of in accordance with local, state or federal laws.

Product disposal at end of product life

ViewSonic Corporation Confidential - DoNot Copy N1930w-2M

TABLE OF CONTENTS

1. Precautions and Safety Notices................................................................. 1

3. Front Panel Function Control Description................................................ 8

4. Circuit Description....................................................................................... 25

5.AdjustmentProcedure................................................................................ 29

6. Trouble Shooting Flow Chart................................................................ ..... 55

7.BlockDiagram............................................................................................. 58

8.SchematicDiagrams.................................................................................... 59

9.PCBLayoutDiagrams................................................................................. 72

10.Exploded View And Exploded Parts List..................................................77

11. Recommend Spare Parts List................................................................... 80

2.Specification................................................................................................. 3

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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 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.

ViewSonic Corporation Confidential - DoNot Copy N1930w-2M

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”

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”

ViewSonic Corporation Confidential - DoNot Copy N1930w-2M

LCD panel of this product shall be provided by “MTD” with a model number of M190MWW1-401.

The following table defines this panel specification. Any changes in panel must be pre-approved by

ViewSonic in written.

Parameter Specification

LCD Type a-Si TFT Active Matrix Wide Color, Transmissive Mode, Normally

Black

LCD Interface 1-Channel LVDS

Resolution (Native) 1440 x 900

Display Area 19” diagonal; 410.4 mm (H) 256.5 mm (V)

Pixel Pitch 0.285 (H) x 0.285 (V) mm

Viewing Angle H = 160, V = 160 with CR≥10 (Typical)

Contrast Ratio 1000:1 (Typical)

Brightness 300 nits (Typical)

Response Time 5 ms, (Typical),

Brightness Uniformity 72% (Min), measured per panel spec.

Chromaticity(CIE1931) White-x:0.313,White-y:0.329 (Standard Mode Only)

Colors 167M (8-bits)

Surface Treatment Hard coating (3H)

Backlight 4 CCFLs (Cold cathode Fluorescent Lamp)

Preset Color Panel Default

Gray Scale 0-255

Rated Life (Backlight) > 50KHrs* (60KHrs Typical)

Front Screen Artifacts

VS Standard:

a.) No Visible Streaking, Sag or Smearing artifacts when driven by

the specified video cards (see 7.1 General Test Equipment) in

the primary mode (VGA & 60 Hz) and after user adjustment

b.) No image drift or lose fine-tune settings due to panel

temperature change.

Panel Acceptance Spec

Refer to the panel acceptance criteria specification.

Note: Intermittent and/or Display Pattern defects which result in

further bright or dark dots will be counted individually against the

above specification.

Note: Also refer to the panel defect acceptance specification.

Panel performance characteristics “ MUST BE” met in all display modes/inputs at standard test

conditions.

1. RF Tuner

RF tuner of this product shall be provided by “Samsung DTVS205CH201A” for NTSC/ATSC. The

following table defines this tuner specification.

Parameter Specification

RF Tuning Range NTSC/ATSC: 55.25 to 803 MHz, 2-69 Channels for Off-Air and

1-125 Channels for CATV

RF Tuner Sensitivity (S/N

Ratio at un-weight) 44 dB (min.)

Channel Bandwidth NTSC/ATSC/Digital Cable: 6 MHz Maximum

CVBS Characteristics:

Video Amplitude Signal

0.8(min.)–1.2(max.) V

Audio Characteristics:

SIF out level

500mV (typ.)

Compatible system TUNER NTSC/ATSC/QAM

Compatible system AV NTSC M

2. Specification

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2. Video

Built-in A/D converter shall provide analog to digital converter for this product.

Input Parameter Specification

CVBS Characteristics:

Video Amplitude Signal

DC Level Sync Pulse

0.7(min.) – 1.1(max.) V

Typical. 0.3 V

S-Video Characteristics:

Video Amplitude Signal

Y : 1.0Vp-p W / Neg. Sync (IN 75 Ω)

C : 0.285Vp-p (IN 75 Ω)

Y, Pb, Pr Characteristics:

Video Amplitude Signal

Y:1.0Vp-p (IN 75 Ω)

Pb:0.7 Vp-p(IN 75 Ω),Pr:0.7 Vp-p (IN 75 Ω)

Video Bandwidth NTSC:6MHzMaximum

HDMI Characteristics Panel Link T.M.D.S HDMI-1.1

RGB Characteristics:

Signal Type

Sync Type

Input Signal Rating

Sync Level:

Frequency Range

Pixel Color

DDC Compliance

EDID Data Table

Analog VGA

TTL, Separate Sync, with 4.7KΩpull-down resistors

1250mV Max without damage to the product, 0-700 mV Full Range

2.5-5.25 V

Horizontal: 30-80K Hz, Vertical: 50-75 Hz

16.7 M

DDC2B Compliant, Rev 1.3

Refer to Appendix

3. Audio

Audio amp of this product shall be provided by “ESMT” with a Model Number of AD5265A.

“MST” MSD2232AL for N1930W2M shall be used as sound processor. In addition, a pair of speakers

shall be integrated within this product. The audio signals of this product shall comply with the

specification listed in the following table.

Parameter Specification

Tuner Input Base band Input

Power Output Max Rating 2.5W at 10 % T.H.D Distortion 2.5W at 10% T.H.D

Distortion

Speaker Impedance main speaker :4 Ωmain speaker :4 Ω

Line In

NTSC: BTSC Mono /

Stereo(standard)

PAL: FM Mono / Stereo(standard)

500 mV rms (Typ)

1.6 V rms (Max)

Impedance: 600 ohms

Line Out earphone jack 500 mV rms

50 mW@16Ω

Flatness of Amplitude

Response +/- 3 db (at 1KHz @1W) +/- 3 db (at 1KHz @1W)

Total Harmonic Distortion

(Po=0.1 to 1 W, f=1KHz) <2% <2%

Signal to Noise: 12 dB (100Hz to 1KHz)

8 dB (1kHz to 10kHz) 35 dB (100Hz to 10 kHz)

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4. Electrical

The following table defines the electrical specification of this product.

ELECTRICAL SPECIFICATION

1 Power Input Voltage Range 100-240VAC +/- 10% Wide Range

2 Input Frequency Range 47-63 Hz

3 Power Supply Inrush Max in < 50A(with fully loaded power supply) at 230Vac Shall not

result in permanent failure of power supply (including blown fuse)

4 Power Consumption: 40 W (Normal), 45W (Max) // Stand by: < 1 W

5 Interference with RF and Video

There shall be no visible interference between power supply, RF and

video signals.This applies to all available RF channels and video

modes.

6 Electromagnetic Compatibility This product shall adhere to the compatibility and immunity

specifications in FCC.

Power Supply Transient

Immunity

(Supply Transients and Outage)

Able to withstand an ANSI / IEEE C62.41 – 1980 2000V ring wave

with no damage.

8 Surge Immunity Test Able to withstand 1.25X nominal Line Voltage for one cycle with no

damage.

Picture Mode Standard, Dynamic, Soft ,Personal

Contrast 0~75~100

Brightness 0~50~100

Sharpness 0~50~100

Tint -50~0~+50

Color 0~84~100

Color Mode Cool, Normal, Warm

Zoom Mode Full, Movie Scale, Zoom In,4:3

PICTURE

NR Standard, Strong, Weak, Auto, Off

Sound Mode Standard, Music, Movie, Sports, Personal

Treble/Bass Bass, Treble, Balance

Prefer Language(ATSC) English, French, Spanish

Surround Sound On, Off

ADUIO

Audio Only On, Off

Sleep Timer OFF, 5,10,15,30,45,60,90,120,180,240 Min

Time Zone Pacific, Alaska, Eastern, Central, Mountain,

Hawaii

DST On, Off

Time-Format 12/24-hour

Auto Sync On, Off

TIME

Clock Year, Month, Day, Hour, Min, OK, Cancel

Menu Language English, French, Spanish

Transparency 0%,25%,50%,75%,100%

OSD Time Out 5,15,30,45,60 sec.

Closed Caption CC off, CC on, CC on mute

Basic Selection off, CC 1~4 Text 1~4

Advanced Selection(ATSC) off, Service 1~6

Option, Font style, Front size, Front edge style

Front edge color, FG color, BG color, F G

Opacity

Option(ATSC)

GG Opacity

DCR On, Off

OPTION

Restore Default Yes, No

TV Source Air, CATV

CHANNEL Auto Scan Scan all channels, Digital channel only, Analog

channel only

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9 Power Supply Missing Cycle

Immunity

Function properly without reset or visible screen artifact when 1/3

cycle of AC Power is randomly missing.

10 Power Supply Acoustics

The Power Supply shall not produce audible noise that would be

detectable by the user (Excluding Power Supply Fan).

“Audible” shall be defined in accordance with ISO 7779 (DIN

EN27779:1991).

Power Switch noise shall be Excluded.

11 Efficiency >= 80% @ full load, nominal line

12 Leakage Current <0.5mA @ 240VAC

13 Power Saving(DPMS) N/A

14 Recovery Time < 3 sec.

15 Power Factor Correction Compliant with EN61000-3-2

5. Remote Control Unit (RCU)

An IR remote control unit shall accompany this product along with battery. In addition, this remote

control unit shall have an operational distance of 5 meters and an operational angle of 15 degrees for

both horizontal and vertical. Besides the key-code and protocol has fully conformed to VS standard.

Parameter Specification

Type IR; Made by Sighter Electronics Co., Ltd.

Range Off axis ±15°≥5M

On axis: ≥7M

Life Testing

(Buttons)

100,000 cycle operations at a rate of 20~30 cycle / minute without load (with

battery)

Color

Painting Color - PANTONE 427C (Black for front & back cover)

Power Key - PANTONE 032C (RED)

Key Pads – PANTONE 10C & PANTONE 7C(Cool Gray)

Texts Printed on Front Cover and Key Pads - PANTONE 427C

Protocol VS key-code & protocol.

ViewSonic Corporation Confidential - DoNot Copy N1930w-2M

6. Mechanical

The following table defines the mechanical specifications of this product for both chassis and cabinet.

Parameter Specification

Dimension

W/O stand

443.0 x 375.9 x 213 mm

443.0 x 322.3 x 74.6 mm

Net Weight 4.85kg

Gross Weight 6.46kg

Net weight *without* stand 4.43kg

Chassis Plastic Material ABS (ABS HB / PC)

External Plastic Chassis

Components

Plastic Chassis, Cover, Stand (Metal + Plastic),Lens and Button

Exterior Chassis

Color/Texture/Details

Refer to – Product ID Guide

Chassis Color Drift Due to UV-Light The color drift due to UL-Light shall be less than 10 “Delta E” in the

1976 CIE L*a*b color space. Testing shall be performed according

to the requirements of ASTM Test Method D4459-93.

Molded Plastic Workmanship shall be inspected according to ViewSonic Molded

Plastic Parts Specification, VSCMPPSPEC001V1.2.

Screen Printed Parts, Bird Logo

Recess

Artwork shall be provided and confirmed by ViewSonic.

Rear Label A label identifying the product name, model/serial number and FCC

ID/Logo shall be placed into the rear label recess located on the rear

panel of the chassis.

Wall Mount 100 mm x 100mm VESA high hole (n=4), M4 X 10 mm, pitch

=0.7mm screw mounting kit not included.

Sample Sample of textured color chips, plastic material specification, and

Material Safety Data Sheets shall be submitted to ViewSonic prior to

Mass Production Release.

In addition, all exterior surfaces shall have uniform texture/color. The maximum acceptable gap between

the buckets to bezel plastic pieces shall be within 1mm.The maximum acceptable gap between LCD

panel and bezel shall be within 1mm.

7. Environmental

The following table defines the operational/storage conditions of the product.

Operating Temperature 0°C to +40°C

Humidity 10% ~ 65% non-condensing

Altitude 0 meter to +3000 meters above sea level

Storage Temperature -20°C to +60°C

Humidity 0 ~ 90% non-condensing

Altitude 0 meter to 12,000 meters above sea level

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