ViewSonic VP2030b-1 Manuale utente

(VP2030b-1_SM Rev. 1a Dec. 2005)

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

ViewSonic VP2030b-1

Model No. VS10772

20” Color TFT LCD Display

Service Manual

Viewsonic Corporation iConfidential -Do Not Copy VP2030b-1

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.

ViewSonicis 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 12/23/2005 Initial release Jamie Chang

TABLE OF CONTENTS

1. Precautions and Safety Notices

2.Specification

3. Front Panel Function Control Description

4. Circuit Description

5.AdjustingProcedure

6. Trouble Shooting Flow Chart

7. Recommended Spare Parts List

8.ExplodedViewAndExplodedPartsList

9.BlockDiagram

10.SchematicDiagrams

11.PCBLayoutDiagrams

Viewsonic Corporation ii Confidential -Do Not Copy VP2030b-1

1. Precaution & Safety Notice

1. 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 guide line

2. Safety Check :

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit.

These voltage are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS

The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC cord is

permanently attached . Any attempt to replace another adapter could result in serious problem on the display .

4. LEAKAGE CURRENT HOT CHECK

4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.

4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part and a

good earth ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the

combination 1500 ohm resistor and 0.15uF capacitor.

4-4 Move the resistor connection to each exposed metallic part and measure the voltage.

4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.

4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A leakage

current tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0

milliamp. In the case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate

the chance of a shock hazard .

To Metal Parts

AC VOLTMETER

1500 10W

0.15u

Earth Ground

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Handling & Placing method

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 “

Viewsonic Corporation 2Confidential -Do Not Copy VP2030b-1

Correct methods : Incorrect Methods :

Take out the monitor with cushion Take out the monitor by grasping the LCD panel.

This may cause “ MURA“.

Correct methods : Incorrect Methods :

Place the monitor on a clean & soft foam pad . Place the monitor on foreign objects .

That could scratch the surface of panel

Viewsonic Corporation 3Confidential -Do Not Copy VP2030b-1

GENERAL specification

Test Resolution & Frequency 1600x1200 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 70%, Brightness = 100%

VIDEO INTERFACE

Input Connector (refer the appendix A) D-Sub = DB-15 (Analog)

DVI-A = DVI-I (Analog)

DVI-D = DVI-I (Digital)

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/CI

Video RGB (Analog)

Separate Sync / Composite Sync / SOG

Video Signals TMDS (Digital)

Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)

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/CI Compliant with Revision 1.0

Sync Compatibility Separate Sync / Composite Sync / SOG

Video Compatibility

Shall be compatible with all PC type

computers, Macintosh computers, and after

market video cards

Resolution Compatibility

640 x 350, 640 x 400, 640 x 480, 720 x 400,

720 x 480, 720 x 576, 800 x 600, 832 x 624,

1024 x 768, 1152 x 864, 1152 x 870, 1280 x

720, 1280 x 768, 1280 x 960, 1280 x 1024,

1360 x 768, 1400 x 1050, 1440 x 900, 1600 x

1200, 1680 x 1050, 1920 x 1080, 1920 x 1200

Exclusions Not compatible with interlaced video

2. Specification

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USB INTERFACE

Up Stream Connector B type USB port x1

Down Stream Connector A type USB port x4

Compatibility Compliant with Revision 2.0

Power The hub gets power from the display.

POWER SUPPLY

Internal Power Supply Delta EADP-64BF

Input Voltage Range 90 to 264 VAC

Input Frequency Range 47.5 to 63 Hertz

Short Circuit Protection Output can be shorted without damage

Over Current Protection 5.0 A typical at 12.0 VDC

Leakage Current 3.5mA (Max) at 254VAC / 60Hz

Efficiency 80 % typical at 115VAC Full Load

Fuse Internal and not user replaceable

Power Dissipation 64 Watts (typ)

Max Input AC Current 1.5 Arms @ 90VAC, 0.75 Arms @180VAC

Inrush Current (Cold Start) 50 A (max) @ 115VAC

90 A (max) @ 230VAC

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 ANSI/IEEE

C62.41-1980 6000V 200 ampere ring wave

transient test with no damage.

Power Supply Line Surge Immunity

Shall be able to withstand 1.5 times nominal

line voltage for one cycle 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 complia

nce with

ISO 7779 (DIN EN27779:1991) Noise

measurements of machines acoustics. Power

Switch noise shall not be considered.

Power Saving Operation(Method) VESA DPMS Signaling

On Mode < 52 W (Typ) / 56 W (max)

Power Consumption Active Off < 3W

Recovery Time On Mode = N/A, Active Off <8sec

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ELECTRICAL REQUIREMENT

Horizontal / Vertical Frequency

Horizontal Frequency 24 –92 KHZ

Vertical Refresh Rate 50 –85* HZ.

Maximum Pixel Clock 165 MHz

Sync Polarity Independent of sync polarity.

Timing Table

Analog

Item

Timing

Separated

Composite

SOG

Digital -TMDS

Remark

640 x 350 @

Hz,

31.5

KHz

üüüü

640 x 350 @

Hz,

37.9

KHz

üüü

For Separated sync, Only horizontal full

screen, The vertical position is at the

center.

640 x 400 @

Hz,

31.5

KHz

üüüü

For SOG sync, switch 640x400@60Hz

and 640x480@60Hz by [1]+[2] short cut

key (primary = 640x480@60Hz)

640 x 400 @

Hz,

31.5

KHz

üüüü

For Separated Sync, Switch

640x400@70Hz and 720x400@70Hz by

[1]+[2] short cut key (primary =

640x400@70Hz)

640 x 400 @

Hz,

37.9

KHz

üüüü

For Separated Sync, Switch

640x400@85Hz and 720x400@85Hz by

[1]+[2] short cut key (primary =

640x400@85Hz)

640 x 480 @

Hz,

24.7

KHz

üüü

640 x 480 @

Hz,

31.5

KHz

üüüü

For SOG sync, switch 640x400@60Hz

and 640x480@60Hz by [1]+[2] short cut

key (primary = 640x480@60Hz)

640 x 480 @

Hz,

35 KHz

üüüü

640 x 480 @

Hz,

37.9

KHz

üüüü

640 x 480 @

Hz,

37.5

KHz

üüüü

640 x 480 @

Hz,

43.3

KHz

üüüü

720 x 400 @

Hz,

31.5

KHz

üüüü

720 x 400 @

Hz,

37.9

KHz

üüüü

For Separated Sync, Switch

640x400@85Hz and 720x400@85Hz by

[1]+[2] short cut key (primary =

Viewsonic Corporation 6Confidential -Do Not Copy VP2030b-1

640x400@85Hz)

720 x 480 @

Hz,

31.5

KHz

720 x 576 @

Hz,

31.3

KHz

üü

800 x 600 @

Hz,

24.7

KHz

üüüü

800 x 600 @

Hz,

35.1

KHz

üüüü

800 x 600 @

Hz,

37.9

KHz

üüüü

800 x 600 @

Hz,

48.1

KHz

üüüü

800 x 600 @

Hz,

46.9

KHz

üüüü

800 x 600 @

Hz,

53.7

KHz

üüüü

832 x 624 @

Hz,

49.7

KHz

üüüü

1024 x 768 @

Hz,

39.6

KHz

üüüü

For Separated and Composite sync,

Switch 1024x768@50Hz and

1280x768@50Hz by [1]+[2] short cut key

(primary = 1024x768@50Hz)

1024 x 768 @

Hz,

48.4

KHz

üüüü

1024 x 768 @

Hz,

56.5

KHz

üüüü

1024 x 768 @

Hz,

58.1

KHz

üüüü

1024 x 768 @

Hz,

60 KHz

üüüü

1024 x 768 @

Hz,

60.2

KHz

üüüü

1024 x 768 @

Hz,

68.7

KHz

üüüü

1152 x 864 @

Hz,

67.5

KHz

üüüü

1152 x 870 @

Hz,

68.7

KHz

üüüü

1280 x 720 @

Hz,

37.5

KHz

üü

1280 x 720 @

Hz,

45 KHz

üü

1280 x 768 @

Hz,

39.6

KHz

üüüü

For Separated and Composite sync,

Switch 1024x768@50Hz and

1280x768@50Hz by [1]+[2] short cut key

(primary = 1024x768@50Hz)

1280 x 768 @

Hz,

47.4

KHz

üüü

For analog sync, Switch

1280x768@60Hz and 1360x768@60Hz

by [1]+[2] short cut key (primary =

1280x768@60Hz)

1280 x 768 @

Hz,

47.8

KHz

üüü

1280 x 768 @

Hz,

60.3

KHz

üüüü

1280 x 768 @

Hz,

68.6

KHz

üüüü

1280 x 960 @

Hz,

49.4

KHz

üüüü

1280 x 960 @

Hz,

59.7

KHz

üüüü

1280 x 960 @

Hz,

75.2

KHz

üüüü

1280 x 960 @

Hz,

85.9

KHz

üüüü

1280 x 1024

Hz,

52.7

KHz

üüüü

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