ViewSonic Q19wb-3 Manuale utente

ViewSonic Q19wb-3

Model No. VS11578

19” Color TFT LCD Display

(Q19wb-3_SM Rev. 1a Oct. 2006)

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

Service Manual

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

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 10/31/2006 Initial Release Jamie Chang

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 10

4. Circuit Description 12

5. Adjustment Procedure 20

6. Troubleshooting Flow Chart 42

7. Recommended Spare Parts List 46

8. Exploded Diagram and Exploded Parts List 48

9. Block Diagram 52

10. Schematic Diagrams 53

11. PCB Layout Diagrams 61

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

1. Precautions and Safety Notices

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. Aleakage 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

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

Q19wb-3 series handling Notice

Correct Method Incorrect method

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

Correct Method Incorrect method

ViewSonic Corporation Confidential - Do Not Copy Q19wb-3

2. Specification

1. GENERAL REQUIREMENTS

General Specification

Test Resolution & Frequency 1440x900 @ 60Hz

Test Image Size Full Size

Contrast and Brightness Controls Factory Default:

Contrast = 80%, Brightness = 100%

2. SIGNAL INTERFACE

Video Interface

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

Default Input Connector D-Sub

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

five minutes

Video Cable Connector DB-15 Pin out Compliant DDC1/2B

Video RGB (Analog)

Video Signals Separate Sync / SOG / Composite

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/CI N/A

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,

800 x 600, 832 x 624, 1024 x 768,

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

1440 x 900,

Exclusions Not compatible with interlaced video

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3. Power

Internal Power Supply Delta EADP-45AF BF

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 0.75mA(Max) at 264VAC / 50Hz

Efficiency 75 % (min.)

Fuse Internal and not user replaceable

Power Dissipation 45 Watts (typ)

Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @264VAC

Inrush Current (Cold Start) 60 A (max) @ 115VAC

90A(Max)264VAC

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 anANSI/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 SupplyAcoustics

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.

Power Saving Operation(Method) VESA DPMS Signaling

On Mode < 40 W (Typ) / 36 W (max)

Power Consumption Active Off < 1 W

Recovery Time On Mode = N/A, Active Off < 5 sec

4. ELECTRICAL REQUIREMENTS

Horizontal /Vertical Frequency

Horizontal Frequency 31 – 81 kHz

Vertical Refresh Rate 50 – 75 Hz.

Maximum Pixel Clock 140 MHz

Sync Polarity Independent of sync polarity.

Timing Table AnalogItem Timing

Separated

Composite

SOG

Digital - TMDS

Remark

1 640 x 350 @ 70 Hz, 31.5 KHz 　　　

2 640 x 400 @ 70 Hz, 31.5 KHz 　　　

For Separated Sync, Switch

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

[AUTO]+[MENU]

short cut key (primary = 720x400@70Hz)

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3 640 x 480 @ 60 Hz, 31.5 KHz 　　　

4 640 x 480 @ 67 Hz, 35 KHz 　　　

5 640 x 480 @ 72 Hz, 37.9 KHz 　　　

6 640 x 480 @ 75 Hz, 37.5 KHz 　　　

7 720 x 400 @ 70 Hz, 31.5 KHz 　　　

8 800 x 600 @ 56 Hz, 35.1 KHz 　　　

9 800 x 600 @ 60 Hz, 37.9 KHz 　　　

10 800 x 600 @ 72 Hz, 48.1 KHz 　　　

11 800 x 600 @ 75 Hz, 49.6 KHz 　　　

12 832 x 624 @ 75 Hz, 49.7 KHz 　　　

13 1024 x 768 @ 60 Hz, 48.4 KHz 　　　

14 1024 x 768 @ 70 Hz, 56.5 KHz 　　　

15 1024 x 768 @ 72 Hz, 58.1 KHz 　　　

16 1024 x 768 @ 75 Hz, 60 KHz 　　　

17 1152 x 864 @ 75 Hz, 67.5 KHz 　　　

18 1152 x 870 @ 75 Hz, 68.7 KHz 　　　

19 1280 x 1024 @ 60 Hz, 64 KHz 　　　

20 1280 x 1024 @ 75 Hz, 80 KHz 　　　

21 1280 x 960 @ 60 Hz 59.7 KHz 　

22 1440 x 900 @ 60 Hz, 55.9 KHz 　　　

23 1440 x 900 @ 75 Hz, 70 KHz 　　　

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), it should recall factory setting when execute “Auto

Adjust”

● The monitor needs to do “Auto Adjust” the first time a new mode is detected

(see section “0-Touch™ FunctionActions”)

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

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5. LCD Panel

1st Source Panel

Model number Hannstar HSD190MGW1-A00

Type Active Matrix TFT

Active Size 19.1"w

Pixel Arrangement RGB Vertical Stripe

Pixel Pitch 0.2835mm x 0.2835mm

Glass Treatment Anti-Glare

# of Backlights 4 CCFL

Backlight Life 50000 Hrs (Min)@6.5mA

300 cd/m2 (Typ after 30 minute warm up)Luminance (Center) –

CT = 6500K,

Contrast/ Brightness = Max 240 cd/m2 (Min after 30 minute warm up)

Brightness Uniformity 75% (min)

Contrast Ratio 700 :1 (Typ)

450 : 1 (Min)

Color Depth 16.2 million colors (6-bit+FRC panel)

Horizontal Viewing Angle 150 degrees (Typ) @ CR>10

130 degrees (Min) @ CR>10

Vertical Viewing Angle 140 degrees (Typ) @ CR>10

120 degrees (Min) @ CR>10

Response Time On/Off

10%-90% @ Ta=25°C Typical = 5 ms (Tr = 1.5 ms; Tf = 3.5 ms)

Maximun = 10 ms (Tr = 3ms; Tf = 7ms)

Mercury 3.5 mg per lamp

Panel Defects Please see Panel Quality Specifications.

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