ViewSonic VX1935wm-1 Building instructions

ViewSonic VX1935wm-1
Model No. VS11307
19” Color TFT LCD Display
(VX1935wm-1_SM Rev. 1a Sep. 2006)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - [phone]
Service Manual

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
i
Copyright
Copyright © 2006 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.
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 9/18/2006 Initial Release Jamie Chang

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
ii
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 32
7. Recommended Spare Parts List 34
8. Exploded Diagram and Exploded Parts List 37
9. Block Diagram 40
10. Schematic Diagrams 41
11. PCB Layout Diagrams 51

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
1
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) Disconnect the power plug from AC outlet if the product is not used for a long period of
time.
(5) If smoke, abnormal noise, or strange odor is present, immediately switch the LCD
display off.
(6) Do not touch the LCD panel surface with sharp or hard objects.
(7) Do not place heavy objects on the LCD display, video cable, or power cord.
(8) Do not use abrasive cleaners, waxes or solvents for your cleaning.
(9) Do not operate the product under the following conditions:
- Extremely hot, cold or humid environment.
- Areas susceptible to excessive dust and dirt.
- Near any appliance generating a strong magnetic field.
- Place 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. Power Supply Requirements
The external AC power operating range shall be from 90 to 264Vac

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
2
5. LCD Module Handling Precautions
5.1. Handling Precautions
(1) Since front polarizer is easily damaged, pay attention not to scratch it.
(2) Be sure to turn off power supply when inserting or disconnecting from input
connector.
(3) Wipe off water drop 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 insure
human earth when handling.
(7) Do not open nor modify the Module Assembly.
(8) Do not press the reflector sheet at the back of the module to any directions.
(9) In case if a Module has to be put back into the packing container slot after once it was
taken out from 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 nor
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 nor bend the TFT Module even momentary. At designing the enclosure, it
should be taken into consideration that no bending/twisting forces are applied to the
TFT Module from outside. Otherwise the TFT Module may be damaged.
(12) Cold cathode fluorescent lamp in LCD contains a small amount of mercury. Please
follow local ordinances or regulations for disposal.
(13) Small amount of materials having no flammability grade is used in the LCD module.
The LCD module should be supplied by power complied with requirements of Limited
Power Source, or be applied exemption.
(14) The LCD module is designed so that the CFL in it is supplied by Limited Current
Circuit.
Do not connect the CFL in Hazardous Voltage Circuit.

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
3
5.2 Handling and Placing Methods
Correct Methods: Incorrect Methods:
1.Take out the monitor with cushions 1.Taking out the monitor by grasping the LCD
panel. That may cause ”Mura”
2.Only touch the metal frame of the LCD panel
or the front cover of the monitor. Do not
touch the surface of the polarizer.
2.Surface of the LCD panel is pressed by
fingers and that may cause ”Mura”.
3.Place the monitor on a clean and soft foam
pad.
3.Placing the monitor on foreign objects. That
could scratch the surface of the panel or
cause “Mura”.

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
4
2. Specification
FEATURES VX1935
Size 19 " wide
Luminance (Typ) 300 cd/㎡
Contrast Ratio (Typ) *1700:1
Colors 16.2 M (6 bits + 2 bits FRC)
Response Time *15 ms (on/off)
Viewing Angle (H/V) 150 ° / 135 °@ CR>10
TFTLCD PANEL
1st
HSD
HSD190MGW1-A
Recommend resolution 1440x900@60Hz
Analog Yes (75ohms, 0.7/1.0 Vp-p)
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) ≦36 W (Energy Star Ver4.0 Tier2)/Power
Consumption Off Mode (Max) ≦1 W
Audio 1.5W / THD 0.5% (Max) Yes
Tilt ( 20 ° - -5 °) Yes
Swivel No
Pivot No
Ergonomics
Height Adjust No
OSD Control [ 1 ] [ 2 ] [ ][▼] [▲] Yes
Physical (W x H x D) 450 x 434 x 210mm
Dimension Package (W x H x D) 545*515*162mm
Physical (Net Weight) 5.6 Kg / 12.3 lbs
Weight Package (Gross Weight) 6.6 Kg / 14.5 lbs
Temperature (℉/℃) 32℉-104℉/ 0℃-40℃
Operating
Condition Humidity (%) 20 % - 80 %
Temperature (℉/℃) -4℉-140℉/ -20℃-60℃
Storage Condition Humidity (%) 10% - 90 %
Regulation
CB ; MPR II ; UL ; CUL ; FCC-B (ICES) ; TUV-S IRAM ; NOM ;
Energy Star ; CE ; NEMKO ERGO ; GOST-R ; HYGIENIC (20
copies) ; SASO ; BSMI ; C-TICK ; PSB ; CCC ; WEEE ; ROHS
zAudio Interface (Speaker Specification)
Line input signal 1.0 Vrms
Line input impedance > 10 kOhm
Maximum Amp power output (Watt) 1.2 W (RL=8Ω)
Speaker Power rating(Ω/Watt) 8Ω/ 1.5 W (MAX)
THD ≦8% (Maxmum output @ 1KHZ)
Signal to Noise Ratio 50 dB
Frequency response 500 Hz – 20 Khz
SPL. 80 ± 3 dB / 10.W‧0.5m
Line input connection 3.5 mm stereo jacks

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
5
Vibration
There should be no audible vibration
resonance at volume=100%(input
signal within 1.0 Vrms)
Screen image There should be no affect on the screen
image stability under any conditions
Connector PC99 requirement Audio in Lime Green pantone # 577C
Cable type / length 3.5mm stereo cable / 1.8m length
Audio DPMS
SPEAKERS STAY ON WHEN THE
REST OF THE MONITOR IS IN
POWER SAVING
NOTE: THERE IS NO GUARANTEE <1
W AT POWER CONSUMPTION IN
ACTIVE OFF MODE, WHEN THE
AUDIO CABLE IS CONNECTED
zPanel Characteristics:
1st Source Panel
Model number HSD HSD190SGW1-A
Type TN TYPE WITH RSDS INTERFACE
Active Size 19” WIDE ; 408.24 (H) x 255.15 (V)
Pixel Arrangement RGB VERTICAL STRIPE
Pixel Pitch 0.2835(H) X 0.2835(H) MM
Glass Treatment ANTI GLARE (HARD COATING 3H)
# of Backlights 4 CCFL ; TOP & BOTTOM EDGE SIDE
Backlight Life 40,000 HOURS (MIN)
Luminance (5-point) –
Condition:
CT = 6500K, Contrast = Max,
Brightness = Max, Inverter
Current=6.5mA
300 CD/M2 (TYP)
240 CD/M2 (MIN AFTER 30 MINUTE WARM
UP)
Brightness Uniformity ≧70% ENTIRE AREA (MIN)
Contrast Ratio *1 700:1 (TYP), 450:1 (MIN)
Color Depth 16.2 MILLION COLORS (6 BITS + 2 BITS
FRC)
Viewing Angle (Horizontal) @ CR>10
Typical: 150º
Minimum: 130º
@ CR>5
Typical: 170º
Minimum: 150º
Viewing Angle (Vertical) @ CR>10
Typical: 140º
MINIMUM: 120º
@ CR>5
Typical: 160º
Minimum: 140º
Response Time *1
10%-90% @ Ta=25°C
Typical = 5ms (Tr =1.5 ms,Tf =3.5 ms)
Maxmum = 10ms (Tr =3ms,Tf =7ms)
Panel Defects Please see Panel Quality Specifications.
*1 Test conditions: Inverter Current=6.5mA, Color Temp.=User Mode, OSD: Brightness=100%, Contrast=100%

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
6
ELECTRICAL REQUIREMENT
Horizontal / Vertical Frequency
Horizontal Frequency 24 – 80 kHz
Vertical Refresh Rate 50 – 75 Hz.
Maximum Pixel Clock 135 MHz
Sync Polarity Independent of sync polarity.
Timing Table
fH fV Dot cloc
k
S
ync polarit
y
Horizontal (dot) Vertical (line)
Mod
e
Resolution (KHz) (Hz) (MHz) H V A B C D E O P Q R S 備註
1
6
40×350 @70Hz VG
A
31.46970.087 25.175 P N 800 96 48 640 16 449 2 60 350 37
2
6
40×350 @85Hz VG
A
37.86185.080 31.500 P N 832 64 96 640 32 445 3 60 350 32
Performance no
guarantee
3
6
40×400 @60Hz VG
A
31.46959.940 25.175 N P 800 96 48 640 16 525 2 73 400 50
Performance no
guarantee
4
6
40×400 @70Hz VG
A
31.46970.087 25.175 N P 800 96 48 640 16 449 2 35 400 12
5
6
40×400 @85Hz VG
A
37.86185.080 31.500 N P 832 64 96 640 32 445 3 41 400 1
Performance no
guarantee
6
6
40×480 @50Hz VG
A
24.68849.637 19.750 N P 800 64 80 640 16 497 4 10 480 3
Performance no
guarantee
7
6
40×480 @60Hz VG
A
31.46959.940 25.175 N N 800 96 48 640 16 526 2 33 480 11
8
6
40×480 @67Hz MA
C
35.00066.667 30.240 N N 864 64 96 640 64 525 3 39 480 3 SOG can support
9
6
40×480 @72Hz VG
A
37.86172.809 31.500 N N 832 40 128 640 24 520 3 28 480 9
10
6
40×480 @75Hz VG
A
37.50075.000 31.500 N N 840 64 120 640 16 500 3 16 480 1
11
6
40×480 @85Hz VG
A
43.26985.008 36.000 N N 832 56 80 640 56 509 3 25 480 1
Performance no
guarantee
12
7
20×400 @70Hz VG
A
31.46970.087 28.322 N P 900 108 45 720 27 449 2 35 400 12
13
7
20×400 @85Hz VG
A
37.92785.039 35.500 N P 936 72 108 720 36 446 3 42 400 1
Performance no
guarantee
fH fV Dot clock
Sync
polarity Horizontal (dot) Vertical (line)
Mod
e Resolution (KHz) (Hz) (MHz) H V A B C D E O P Q R S 備註
14 720x480@60Hz 31.469 59.940 27.000 N N 858 62 76 720 0 525 6 39 480 0
Performance no
guarantee
15 720x576 @50Hz 31.250 50.000 27.000 N N 864 64 12 720 68 625 5 5 576 39
Performance no
guarantee
16
800×600 @56Hz
SVGA 35.156 56.250 36.000 P P 1024 72 128 800 24 625 2 22 600 1
17
800×600 @60Hz
SVGA 37.879 60.317 40.000 P P 1056 128 88 800 40 628 4 23 600 1
18
800×600 @72Hz
SVGA 48.077 72.188 50.000 P P 1040 120 64 800 56 666 6 23 600 37
19
800×600 @75Hz
SVGA 46.875 75.000 49.500 P P 1056 80 160 800 16 625 3 21 600 1
20
800×600 @85Hz
SVGA 53.674 85.061 56.250 P P 1048 64 152 800 32 631 3 27 600 1
Performance no
guarantee
21
832×624 @74.6Hz
MAC 49.725 74.500 57.283 N N 1152 64 224 832 32 667 3 39 624 1 SOG can support
22 1024×768 @50Hz XGA 39.643 49.980 52.000 N P 1312 104 144 1024 40 793 4 18 768 3
Performance no
guarantee
23 1024×768 @60Hz XGA 48.363 60.004 65.000 N N 1344 136 160 1024 24 806 6 29 768 3
24 1024×768 @70Hz XGA 56.476 70.069 75.000 N N 1328 136 144 1024 24 806 6 29 768 3
25 1024×768 @75Hz XGA 60.023 75.029 78.750 P P 1312 96 176 1024 16 800 3 28 768 1
26
1024×768 @75Hz
MAC 60.150 74.720 80.000 N N 1330 96 168 1024 42 805 3 31 768 3
27 1024×768 @85Hz XGA 68.677 84.997 94.500 P P 1376 96 208 1024 48 808 3 36 768 1
Performance no
guarantee
28
1152×864 @75Hz
SXGA 67.500 75.000 108.000 P P 1600 128 256 1152 64 900 3 32 864 1
29 1152×870 @75Hz MAC 68.681 75.062 100.000 N N 1456 128 144 1152 32 915 3 39 870 3 SOG can support
30 1280×768@50Hz 39.593 49.929 65.250 N P 1648 128 184 1280 56 793 7 15 768 3
Performance no
guarantee
31 1280×768 @60Hz 47.396 59.995 68.250 P N 1440 32 80 1280 48 790 7 12 768 3
32 1280×768 @60Hz 47.776 59.870 79.500 N P 1664 128 192 1280 64 798 7 20 768 3
33 1280×768 @75Hz 60.289 74.893 102.250 N P 1696 128 208 1280 80 805 7 27 768 3
34 1280×768 @85Hz 68.633 84.837 117.500 N P 1712 136 216 1280 80 809 7 31 768 3
Performance no
guarantee
35 1280×960 @50Hz 49.405 49.853 83.000 N P 1680 128 200 1280 72 991 4 3 960 3
Performance no
guarantee
36 1280×960 @60Hz 60.000 60.000 108.000 P P 1800 112 312 1280 96 1000 3 36 960 1

ViewSonic Corporation Confidential - Do Not Copy VX1935wm-1
7
fH fV
Dot
clock
Sync
polarity Horizontal (dot) Vertical (line)
Mod
e Resolution (KHz) (Hz) (MHz) H V A B C D E O P Q R S 備註
37 1280×960 @75Hz 74.592 74.443 128.895 P P 1728 136 224 1280 88 1002 3 36 960 3
38 1280×1024 @50Hz SXGA 52.679 49.838 80.500 N P 1680 128 200 1280 72 1057 7 23 1024 3
Performance no
guarantee
39 1280×1024 @60Hz SXGA 63.981 60.020 108.000 P P 1688 112 248 1280 48 1066 3 38 1024 1
41 1280×1024 @72Hz SXGA 76.020 71.448 130.223 P P 1712 133 248 1280 51 1064 2 38 1024 0
42 1280×1024 @75Hz SXGA 79.976 75.025 135.000 P P 1688 144 248 1280 16 1066 3 38 1024 1
43 1360×768 @60Hz WXGA 47.712 60.015 85.500 P P 1792 112 256 1360 64 795 6 18 768 3
44
1400×1050 @50Hz WXGA
+ 54.113 49.965 100.000 N P 1848 144 224 1400 80 1083 4 26 1050 3
Performance no
guarantee
45
1400×1050 @60Hz WXGA
+ 64.744 59.948 101.000 P N 1560 32 80 1400 48 1080 4 23 1050 3
46
1400×1050 @60Hz WXGA
+ 65.317 59.978 121.750 N P 1864 144 232 1400 88 1089 4 32 1050 3
47
1400×1050 @75Hz WXGA
+ 82.278 74.867 156.000 N P 1896 144 248 1400 104 1099 4 42 1050 3
48
1440×900 @60Hz WXGA
+ 55.469 59.901 88.750 P N 1600 32 80 1440 48 926 6 17 900 3
49
1440×900 @60Hz WXGA
+ 55.935 59.887 106.500 N P 1904 152 232 1440 80 934 6 25 900 3
50
1440×900 @75Hz WXGA
+ 70.635 74.984 136.750 N P 1936 152 248 1440 96 942 6 33 900 3
*1. Tolerance ± 2kHz.≧
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD message without
blanking.
*3. The image quality of 85Hz mode might be worse than 75Hz. (Display quality is not guaranteed because the LCD
panel supports upto 75Hz)
Primary Presets
1440x900 @ 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
Image Adjust” time
● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when
execute “Auto Image Adjust”
● The monitor needs to do “Auto Adjust” the first time when a new mode is detected(See
section “0-Touch™ Function Actions”)