ViewSonic VP2030b-1 User manual

(VP2030b-1_SM Rev. 1a Dec. 2005)
ViewSonic®381 Brea Canyon Road, Walnut, California 91789 USA -[phone]
ViewSonic VP2030b-1
Model No. VS10772
20” Color TFT LCD Display
Service Manual

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Copyright
Copyright © 2005 by ViewSonic Corporation. All rights reserved. No part of this publication 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.
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
1
4
10
13
26
53
60
63
67
68
73
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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
V
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 “
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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
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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
1
640 x 350 @
70
Hz,
31.5
KHz
üüüü
2
640 x 350 @
85
Hz,
37.9
KHz
üüü
For Separated sync, Only horizontal full
screen, The vertical position is at the
center.
3
640 x 400 @
60
Hz,
31.5
KHz
üüüü
For SOG sync, switch 640x400@60Hz
and 640x480@60Hz by [1]+[2] short cut
key (primary = 640x480@60Hz)
4
640 x 400 @
70
Hz,
31.5
KHz
üüüü
For Separated Sync, Switch
640x400@70Hz and 720x400@70Hz by
[1]+[2] short cut key (primary =
640x400@70Hz)
5
640 x 400 @
85
Hz,
37.9
KHz
üüüü
For Separated Sync, Switch
640x400@85Hz and 720x400@85Hz by
[1]+[2] short cut key (primary =
640x400@85Hz)
6
640 x 480 @
50
Hz,
24.7
KHz
üüü
7
640 x 480 @
60
Hz,
31.5
KHz
üüüü
For SOG sync, switch 640x400@60Hz
and 640x480@60Hz by [1]+[2] short cut
key (primary = 640x480@60Hz)
8
640 x 480 @
67
Hz,
35 KHz
üüüü
9
640 x 480 @
72
Hz,
37.9
KHz
üüüü
10
640 x 480 @
75
Hz,
37.5
KHz
üüüü
11
640 x 480 @
85
Hz,
43.3
KHz
üüüü
12
720 x 400 @
70
Hz,
31.5
KHz
üüüü
13
720 x 400 @
85
Hz,
37.9
KHz
üüüü
For Separated Sync, Switch
640x400@85Hz and 720x400@85Hz by
[1]+[2] short cut key (primary =
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640x400@85Hz)
14
720 x 480 @
60
Hz,
31.5
KHz
ü
ü
15
720 x 576 @
50
Hz,
31.3
KHz
üü
16
800 x 600 @
50
Hz,
24.7
KHz
üüüü
17
800 x 600 @
56
Hz,
35.1
KHz
üüüü
18
800 x 600 @
60
Hz,
37.9
KHz
üüüü
19
800 x 600 @
72
Hz,
48.1
KHz
üüüü
20
800 x 600 @
75
Hz,
46.9
KHz
üüüü
21
800 x 600 @
85
Hz,
53.7
KHz
üüüü
22
832 x 624 @
75
Hz,
49.7
KHz
üüüü
23
1024 x 768 @
50
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)
24
1024 x 768 @
60
Hz,
48.4
KHz
üüüü
25
1024 x 768 @
70
Hz,
56.5
KHz
üüüü
26
1024 x 768 @
72
Hz,
58.1
KHz
üüüü
27
1024 x 768 @
75
Hz,
60 KHz
üüüü
28
1024 x 768 @
75
Hz,
60.2
KHz
üüüü
29
1024 x 768 @
85
Hz,
68.7
KHz
üüüü
30
1152 x 864 @
75
Hz,
67.5
KHz
üüüü
31
1152 x 870 @
75
Hz,
68.7
KHz
üüüü
32
1280 x 720 @
50
Hz,
37.5
KHz
üü
33
1280 x 720 @
60
Hz,
45 KHz
üü
34
1280 x 768 @
50
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)
35
1280 x 768 @
60
Hz,
47.4
KHz
üüü
For analog sync, Switch
1280x768@60Hz and 1360x768@60Hz
by [1]+[2] short cut key (primary =
1280x768@60Hz)
36
1280 x 768 @
60
Hz,
47.8
KHz
üüü
37
1280 x 768 @
75
Hz,
60.3
KHz
üüüü
38
1280 x 768 @
85
Hz,
68.6
KHz
üüüü
39
1280 x 960 @
50
Hz,
49.4
KHz
üüüü
40
1280 x 960 @
60
Hz,
59.7
KHz
üüüü
41
1280 x 960 @
75
Hz,
75.2
KHz
üüüü
42
1280 x 960 @
85
Hz,
85.9
KHz
üüüü
43
1280 x 1024
@
50
Hz,
52.7
KHz
üüüü
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