ViewSonic VE720m-1 User manual

Service Manual

ViewSonic VE720m-1

VE720mb-1

Model No. VS10697

17” Color TFT LCD Display

(VE720m-1_VE720mb-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.

Revision History

Revision SM Editing Date ECR Number Description of Changes Editor

1a 05/09/2006 Initial release J. Chang

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.

1b 8/28/2006 Add RSPL BOM EPL for VE720mb-1 Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 8

4. Circuit Description 12

5. Adjustment Procedure 13

6. Troubleshooting Flow Chart 45

7. Recommended Spare Parts List 53

8. Exploded Diagram and Exploded Parts List 57

9. Block Diagram 60

10. Schematic Diagrams 61

11. PCB Layout Diagrams 69

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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.

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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.

(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

introduction

FEATURES

Size 17”

Luminance (Typ, cd/㎡)350 cd/㎡

Contrast Ratio (Typ) 350:1

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

Response Time (Typ) 8 ms

Viewing Angle (H/V) 160 ° / 120 °

TFTLCD PANEL

Recommend resolution 1280x1024@60Hz

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

Input Signal Digital N/A

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) 60 W / 51 W

Power Consumption Active Off Mode (Max) ≦2 W

Audio 1 W Yes

Tilt ( 20 ° +-2°--5°+-1.5°)Yes

Swivel No

Pivot No

Ergonomics

Height Adjust 0~100mm

OSD Control [XX] [ 1 ] [?] [?][ 2 ] [ ] Yes

Physical (W x H x D ) 386 x 404 x 221 (mm)

15.2 x 15.9 x 8.7 (in)

Dimension Package (W x H x D mm) 444 x 458 x 191 (mm)

17.5 x18.0 x 7.52 (in)

Physical (Net kg/lb) 4.3 kg (9.5 lb)

Weight Package (Gross Kg/lb) 5.9 kg (13.0 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), TCO99, GOST-R + 20 ORIGINAL COPIES HYGIENIC, SASO, PCBC,

VCCI, BSMI, CCC, (PSB), (C-TICK), TUV-S, Green Mark, Energy Star

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GENERAL specification

Test Resolution & Frequency 1280x1024 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

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)

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: UP060B1190 or DA-60F19

Input Voltage Range 90 to 264 VAC

Input Frequency Range 47 to 63 Hertz

Short Circuit Protection OUTPUT CAN BE SHORTED WITHOUT DAMAGE

Over Current Protection 3.476~4.74 A TYPICALAT 18.05 VDC

Leakage Current 0.25MA (MAX) AT 264VAC / 60HZ

Efficiency 80 % TYPICAL AT 115VAC FULL LOAD

Fuse INTERNAL AND NOT USER REPLACEABLE

Power Dissipation 60 WATTS (MAX) / 51 WATTS (TYP)

Max Input AC Current 1.6 ARMS @ 90VAC

Inrush Current (Cold Start)

80 A @ 120VAC, 80 A(

MAX) @220VAC

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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

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 < 60 W(max) / 51 W(typ)

ACTIVE OFF < 2W

Recovery Time ON Mode = N/A, ACTIVE OFF < 5sec

ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 30 –82 kHz

Vertical Refresh Rate 50 –85* Hz.

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

Sync Polarity Independent of sync polarity.

Timing Table

Item Timing Analog

1640 x 350 @ 70Hz, 31.5kHz Yes

2640 x 400 @ 60Hz, 31.5kHz Yes

3640 x 400 @ 70Hz, 31.5kHz Yes

5640 x 480 @ 60Hz, 31.5kHz Yes

6640 x 480 @ 67Hz, 35.0kHz Yes

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7640 x 480 @ 72Hz, 37.9kHz Yes

8640 x 480 @ 75Hz, 37.5kHz Yes

9640 x 480 @ 85Hz, 43.27kHz Yes

10 720 x 400 @ 70Hz, 31.5kHz Yes

11 800 x 600 @ 56Hz, 35.1kHz Yes

12 800 x 600 @ 60Hz, 37.9kHz Yes

13 800 x 600 @ 75Hz, 46.9kHz Yes

14 800 x 600 @ 72Hz, 48.1kHz Yes

15 800 x 600 @ 85Hz, 53.7kHz Yes

16 832 x 624 @ 75Hz, 49.7kHz Yes

17 1024 x 768 @ 60Hz, 48.4kHz Yes

18 1024 x 768 @ 70Hz, 56.5kHz Yes

19 1024 x 768 @ 72Hz, 58.1kHz Yes

20 1024 x 768 @ 75Hz, 60.0kHz Yes

21 1024 x 768 @ 85Hz, 68.67kHz Yes

22 1152 x 870 @ 75Hz, 68.7kHz Yes

23 1280 x 1024 @ 60Hz, 63.4kHz Yes

24 1280 x 1024 @ 75Hz, 79.97kHz Yes

25 1280x 720 @ 60Hz, 45kHz (HDTV) Yes

Note 1:When Vertical frequency at 85Hz orresolution, the vertical image size might

not be full screen. But the vertical image position should be at the center.

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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