ViewSonic VA1912W - 19" LCD Monitor Manuale utente

Model No. VS10866

19” Color TFT LCD Display

Service Manual

ViewSonic VA1912W/Wb

ViewSonic

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

(VA1912W/Wb_SM Rev. 1a Oct. 2005)

I. Copyright

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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 10/25/05 Initial Release G. Han

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TABLE OF CONTENTS

2. Specification

3. Front Panel Function Control Description

4. Circuit Description

6. Troubleshooting Flow Chart

9. Block Diagram

10. Schematic Diagrams

7. Recommended Spare Parts List

1. Precautions and Safety Notices

5. Adjustment Procedure

8. Exploded Diagram and Exploded Parts List

11. PCB Layout Diagrams

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) Use only a high quality, safety approved AC/DC power cord.

(5) Disconnect the power plug from the AC outlet if the product will not be used for a long period of time.

(6) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD display off.

(7) Do not touch the LCD panel surface with sharp or hard objects.

(8) Do not place heavy objects on the LCD display, video cable, or power cord.

(9) Do not use abrasive cleaners, waxes or solvents for your cleaning.

(10) Do not operate the product under the following conditions:

- Extremely hot, cold or humid environment.

- Areas containing excessive dust and dirt.

- Near any appliance generating a strong magnetic field.

- 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. LCD Module Handling Precautions

4.1 Handling Precautions

(1) Since front polarizer is easily damaged, pay attention not to scratch it.

(2) Be sure to turn off power supply when connecting or disconnecting input connector.

(3) Wipe off water drops 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 ensure human earth when handling.

(7) Do not open or modify the Module Assembly.

(8) Do not press the reflector sheet at the back of the module in any direction.

(9) In the event that a Module must be put back into the packing container slot after it was taken out of 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 or tilt the Interface

Connector of the TFT Module.

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(11) After installation of the TFT Module into an enclosure (LCD monitor housing, for example), do not twist or

bend the TFT Module even momentarily. When designing the enclosure, it should be taken into consideration

that no bending/twisting forces may be applied to the TFT Module from outside. Otherwise the TFT Module

may be damaged.

(12) The cold cathode fluorescent lamp in the LCD contains a small amount of mercury. Please follow local

ordinances or regulations for disposal.

(13) The LCD module contains a small amount of materials having no flammability grade. The LCD module

should be supplied with power that complies with the requirements of Limited Power Source

(IEC60950 or UL1950), or an exemption should be applied for.

(14) The LCD module is designed so that the CCFL in it is supplied by a Limited Current Circuit (IEC60950

or UL1950). Do not connect the CCFL to a Hazardous Voltage Circuit

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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

2.1 INTRODUCTION

FEATURES VA1912w / VA1912wb

Size 19” wide

Luminance (Typ, cd/㎡) 280 cd/㎡

Contrast Ratio (Typ) 500:1

Colors ( 6 bit + 2 bit FRC) 16.2 M colors

Response Time (Typ) 8 ms

Viewing Angle (H/V) 150 ° / 130 °

TFTLCD PANEL

Recommend resolution 1440 x 900@60Hz

Analog (75ohms, 0.7/1.0 Vp-p) Yes

Input Signal Digital Yes

Separate Sync Yes

Composite Sync No

Sync Compatibility

Sync on Green No

PC Yes

Power Mac Yes

Compatibility

TV Box (NextVision 6) Yes

Power Voltage AC 100-240V, 50/60Hz Yes

On Mode(Max / Typ) 36W(max) / 32W(typ)

Power Consumption Active Off Mode (Max) <1W

Audio Amplifier/Speaker 1.5W/2.5W x2

Tilt ( 20 ° to -5 °) Yes

Swivel No

Pivot No

Ergonomics

Height Adjust No

OSD Control [;X] [ 1 ] [▼] [▲] [ 2 ] [ ] Yes

Physical (W x H x D mm) 451 x 391 x 197 (mm)

17.8 x 15.4 x 7.8 (in)

Dimension

Package (W x H x D mm) 538 x 470 x 158 (mm)

21.2 x 18.5 x 6.2 (in)

Physical (Net kg/lb) 4.5kg (9.9lb)

Weight Package (Gross Kg/lb) 5.7kg (12.5lb)

Temperature ( / )℉℃ 41℉-95 /℉+5℃-+35℃

Operating Condition Humidity (%) 20 % - 80 %

Temperature ( / )℉℃ -4℉-131 /℉-20℃-55℃

Storage Condition Humidity (%) 20 % - 85 %

Regulation

CB / TCO99 / UL/cUL / FCC-B / ICES 003 / Argentina-TUV/S / NOM / EPA Energy

Star / TUV/Ergo / ISO13406-2 / TUV/GS / CE / GOST-R / SASO / BSMI / PSB /

C-Tick / Korea (MIC) / CCC

2.2 GENERAL specification

Test Resolution & Frequency 1440 x 900 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

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2.3 VIDEO INTERFACE

Analog Input Connector DB-15 (Analog), refer the appendix A

Digital Input Connector N/A

Default Input Connector Defaults to the first detected input

Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes

Video Cable Connector DB-15 Pin out Compliant DDC 2B

Video Signals

1. Video RGB (Analog)

2. DVI (Digital)

Separate

Video Impedance 75 Ohms (Analog)

Maximum PC Video Signal 950 mV with no damage to monitor

Maximum Mac Video Signal 1250 mV with no damage to monitor

Sync Signals TTL

DDC 2B Compliant with Revision 1.3

Sync Compatibility Separate Sync

Video Compatibility Shall be compatible with all PC type computers,

Macintosh computers, and after market video cards

Resolution Compatibility

640 x 350*, 640 x 480, 720 x 400* (640 x 400*), 800 x

600, 832 x 624, 1024 x 768, 1152 x 864, 1280 x 768,

1280 x 960, 1280 x 1024, 1440 x 900

* The image vertical size might not be full screen.

But the image vertical position should be at the center.

Exclusions Not compatible with interlaced video

2.4 POWER SUPPLY

Power Supply (power build-in) CMO Part Number: 27-D003247

Input Voltage Range 100 TO 240 VAC

Input Frequency Range 50 TO 60 HERTZ

Short Circuit Protection Output can be shorted without damage

Over Current Protection FUSE 3.15 A typical at 250 VAC

Leakage Current 75 mA (Max) at 240VAC / 50Hz

EFFICIENCY 80 % typical at 100VAC @ 60 Hert

Fuse Internal and not user replaceable

Power Dissipation <1 Watts

Max Input AC Current 1.6 Arms @ nominal range

INRUSH CURRENT (COLD START) 80 A @ 240VAC , 50Hz

Power Supply Cold Start

Shall start and function properly when under full load,

with all combinations of input voltage, input frequency,

and operating temperature

Power Supply Transient Immunity Shall be able to withstand an EN61000-4-4 ±2KV

transient test with no damage

Power Supply Line Surge Immunity Shall be able to withstand ±2KV (L-L) and ±2.3KV

(L-PE) with no damage

Power Supply Missing Cycle Immunity

Shall be able to function properly, without reset or visible

screen artifacts, when ½ cycle of AC power is randomly

missing at nominal input

Power Supply Acoustics

The power supply shall not produce audible noise that

would be detectable by the user. Audible shall defined

to be in compliance with ISO 7779 (DIN EN27779:1991)

Noise measurements of machines acoustics. Power

Switch noise shall not be considered

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US Type Power Cable

Separate 3-prong NEMA 5-15P type plug. Length = 1.8m.

Connects to display.

Color = Black

European Type Power Cable

Schuko CEE7-7 type plug.

Length = 1.8m, Connects to display.

Color = Black

CCC Type Power Cable

Separate 3-prong type plug.

Length = 1.8m. Connects to display.

Color = Black

PSE Type Power Cable

Separate 2-prong NEMA 1-15P type plug. Length = 1.8m.

Connects to display.

Color = Black

Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption ON Mode < 36 W (max) / 32 W (typ)

ACTIVE OFF < 1 W

Recovery Time ON MODE = N/A, ACTIVE OFF < 5 SEC

2.5 ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 – 82 KHZ

Vertical Refresh Rate 50 – 85* HZ.

Maximum Pixel Clock 135 MHz (EDID file is 140MHz)

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog Digital

1 640 x 350 @ 70Hz, 31.5kHz Yes Yes

2 640 x 400 @ 60Hz, 31.5kHz Yes* Yes

3 640 x 400 @ 70Hz, 31.5kHz Yes Yes

4 640 x 480 @ 60Hz, 31.5kHz Yes Yes

5 640 x 480 @ 67Hz, 35.0kHz Yes Yes

6 640 x 480 @ 72Hz, 37.9kHz Yes Yes

7 640 x 480 @ 75Hz, 37.5kHz Yes Yes

8 640 x 480 @ 85Hz, 43.27kHz Yes Yes

9 720 x 400 @ 70Hz, 31.5kHz Yes Yes

10 800 x 600 @ 56Hz, 35.1kHz Yes Yes

11 800 x 600 @ 60Hz, 37.9kHz Yes Yes

12 800 x 600 @ 75Hz, 46.9kHz Yes Yes

13 800 x 600 @ 72Hz, 48.1kHz Yes Yes

14 800 x 600 @ 85Hz, 53.7kHz Yes Yes

15 832 x 624 @ 75Hz, 49.7kHz Yes Yes

16 1024 x 768 @ 60Hz, 48.4kHz Yes Yes

17 1024 x 768 @ 70Hz, 56.5kHz Yes Yes

18 1024 x 768 @ 72Hz, 58.1kHz Yes Yes

19 1024 x 768 @ 75Hz, 60.0kHz Yes Yes

20 1024 x 768 @ 85Hz, 68.67kHz Yes Yes

21 1152 x 864@ 75Hz, 67.5kHz Yes Yes

22 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes

23 1280 x 1024 @ 75Hz, 79.97kHz Yes No

24 1280x 768 @ 60Hz, 47.78kHz Yes Yes

25 1280 x 960 @60Hz, 60kHz Yes Yes

26 1440 x 900 @ 60Hz, 55.96kHz Yes Yes

*: The vertical image size might not be full screen.

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2.6 FRONT PANEL CONTROLS AND INDICATORS

Front Panel Hardware Controls

Power Switch (Front Head) Power Control, soft Power Switch.

Power LED (Front Head) Green – ON

Orange – Active Off

Dark = Soft Power Switch OFF

Front Panel Controls (Head)

[;X] [ 1 ] [▼] [▲] [ 2 ] [ ]

[] Power

[ 1 ] Button 1

[ 2 ] Button 2

[▲] Up arrow button

[▼] Down arrow button

[;X] AUDIO MUTE ON/OFF

Note: Power Button, Button 1 and Button 2 and Mute

Button must be one-shot logic operation. (i.e. there should

be no cycling)

Reaction Time OSD must fully appear within 0.5s after pushing Button 1

Short Cuts Function from the button(s)

[1] Main Menu

[2] Input toggle (Analog or Digital)

[▼] or [▲] To immediately activate Contrast menu. It should be change to Brightness

OSD by push button [2]

[▼] + [▲] Recall both of Contrast and Brightness to default

[1] + [2] Toggle 720x400 and 640x400 mode when input 720x400 or 640x400

mode

[1] + [▼] + [▲] White Balance. (Not shown on user’s guide)

[1] + [▼] Power Lock

[1] + [▲] OSD Lock

[;X] Audio Mute on /off

Remark : All the short cuts function are only available while OSD off

Function descriptions

OSD Lock short cuts function for the buttons

The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user

then tries to access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen

for 3 seconds showing "OSD Locked". The OSD lock will be deactivated by pressing the front panel control

buttons "(1), & (▲)" again for 10 seconds.

Note1: When the OSD is locked will lock all functions, including “Volume” and “Mute”

Note 2: Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD

Locked”

Note 3: OSD Lock should not lock Power Button and Power Lock function

Power Lock short cuts function for the buttons

The power button lock will be activated by pressing the front panel control buttons "(1), & (▼)" for 10 seconds.

Locking the power button means that the user won't be able to turn off the LCD while the power button is locked.

If the user presses the power button while it is locked, a message will appear on the screen for 3 seconds showing

"Power Button Locked". It also means that with the power button locked, the LCD would automatically turn back

"On" when power is restored after a power failure. If the power button is not in the locked mode, then power

should return to it's previous state when power is restored after a power failure. The power button lock will be

deactivated by pressing the front panel control buttons "(1), & (▼)" again for 10 seconds.

Note 1: Status bar indicating Power Button lock or unlock is in progress and when complete it will indicate

“Power Button Locked”

Note 2: Power should only be lockable in the “On State”

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