ViewSonic VS10931 Manuale utente

Service Manual

ViewSonic VE920m-1

VE920mb-1

Model No. VS10931

19” Color TFT LCD Display

(VE920m-1_VE920mb-1_SM Rev. 1b Aug. 2006)

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

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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 05/26/2006 Initial release J. Chang

1b Add RSPL BOM EPL for VE920mb-1 J. Chang

ViewSonic Corporation Confidential - Do Not Copy VE920m-1_VE920mb-1

8/28/2006

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 8

4. Circuit Description 13

5. Adjustment Procedure 14

6. Troubleshooting Flow Chart 49

7. Recommended Spare Parts List 57

8. Exploded Diagram and Exploded Parts List 61

9. Block Diagram 64

10. Schematic Diagrams 65

11. PCB Layout Diagrams 75

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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) 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.

ViewSonic Corporation Confidential - Do Not Copy VE920m-1_VE920mb-1

(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.

(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

ViewSonic Corporation Confidential - Do Not Copy VE920m-1_VE920mb-1

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

ViewSonic Corporation Confidential - Do Not Copy VE920m-1_VE920mb-1

2. Specification

Introduction

FEATURES

Size 19”

Luminance (Typ, cd/㎡)280 cd/㎡

Contrast Ratio (Typ) 450:1

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

Response Time (Typ) 8 ms

ViewingAngle (H/V) 150 ° / 130 °

TFTLCD PANEL

Recommend resolution 1280x1024@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) 58W

Power Consumption Active Off Mode (Max) 2W

Audio 1.2 W (audio), 2W*2 (speaker) Yes

Tilt (20 ° to -5 °)Yes

Swivel No

Pivot No

Ergonomics

HeightAdjust No

OSD Control [XX] [ 1 ] [▼] [▲] [ 2 ] [ ] Yes

Physical (W x H x D mm) 423 x 434 x 221 (mm)

16.7 x 17.1 x 8.7 (in)

Dimension Package (W x H x D mm) 474 x 475 x 184 (mm)

17.6 x 18.7 x 7.2 (in)

Physical (Net kg/lb) 5.2 kg / 11.5 lb

Weight Package (Gross Kg/lb) 6.8 kg / 15.0 lb

Temperature (℉/℃)41℉-95℉/+5℃-+35℃

Operating Condition Humidity (%) 20 % -80 %

Temperature (℉/℃)-4℉-131℉/-20℃-55℃

Storage Condition Humidity (%) 20 % -85 %

Regulation

UL, cUL, FCC-B, CB, CE, NOM, TUV/GS, TUV ERGO (covers ISO13406-2 & MPRII),

TCO03, GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC,

(PSB), (C-TICK), TUV-S, Green Mark, energy star

HYGIENIC, SASO, PCBC, VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark,

energy star

GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

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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 870, 1280 x 720, 1280 x 960, 1280 x 1024

* 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

POWER SUPPLY

Power Supply (Adapter) Part Number: 27-D003115

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 3.3~4.5 A typical at 5 VDC

Leakage Current 3.5 MA (MAX) AT 254VAC / 60HZ

Efficiency 80 % TYPICAL AT 115 VAC FULL LOAD

Fuse INTERNAL AND NOT USER REPLACEABLE

Power Dissipation 58 (Max) Watt

Max Input AC Current 1.8 A RMS @ 100 VAC,

Inrush Current (Cold Start) 120A(MAX) @ 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

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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

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

Power Saving Operation(Method) VESA DPMS Signaling

Power Consumption ON Mode < 58 W(max)

ACTIVE OFF < 2W

Recovery Time ON Mode = N/A, ACTIVE OFF < 3sec

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.

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Timing Table

Item Timing Analog Digital

1640 x 350 @ 70Hz, 31.5kHz Yes No

2640 x 400 @ 60Hz, 31.5kHz Yes* No

3640 x 400 @ 70Hz, 31.5kHz Yes No

4640 x 480 @ 60Hz, 31.5kHz Yes No

5640 x 480 @ 67Hz, 35.0kHz Yes No

6640 x 480 @ 72Hz, 37.9kHz Yes No

7640 x 480 @ 75Hz, 37.5kHz Yes No

8640 x 480 @ 85Hz, 43.27kHz Yes No

9720 x 400 @ 70Hz, 31.5kHz Yes No

10 800 x 600 @ 56Hz, 35.1kHz Yes No

11 800 x 600 @ 60Hz, 37.9kHz Yes No

12 800 x 600 @ 75Hz, 46.9kHz Yes No

13 800 x 600 @ 72Hz, 48.1kHz Yes No

14 800 x 600 @ 85Hz, 53.7kHz Yes No

15 832 x 624 @ 75Hz, 49.7kHz Yes No

16 1024 x 768 @ 60Hz, 48.4kHz Yes No

17 1024 x 768 @ 70Hz, 56.5kHz Yes No

18 1024 x 768 @ 72Hz, 58.1kHz Yes No

19 1024 x 768 @ 75Hz, 60.0kHz Yes No

20 1024 x 768 @ 85Hz, 68.67kHz Yes No

21 1152 x 870 @ 75Hz, 68.7kHz Yes No

22 1280 x 1024 @ 60Hz, 63.4kHz Yes No

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

24 1280x 720 @ 60Hz, 45kHz (HDTV) Yes No

Note 1:When Vertical frequency at 85Hz or resolution, the vertical image size might not be full screen. But the

vertical image position should be at the center.

Note2: *: The vertical image size might not be full screen.

Primary Presets

1280x1024 @ 60Hz

User Presets

Number of User Presets (recognized timings) Available: 10 presets total in FIFO configuration

Changing Modes

●Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Adjust” time

●Under DOS mode (640 x 350, 720 x 400 & 640 x 400), there is no “Auto Adjust” feature.

●The monitor needs to do “Auto Adjust” the first time a new mode is detected but except the DOS mode 640 x 350, 720 x

400 & 640 x 400.(see section “0-Touch™ Function Actions”)

●While running Change Mode, Auto Adjust or Memory Recall, the image shall blank

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