ViewSonic VX2739W-2, VS12843-1W Schematic
Service Manual
ViewSonic VX2739W-2
Model No. VS12843-1W
27" Wide LCD Monitor
(VX2739W-2 SM Rev. 1a Jul. 2010)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
1
Copyright© 2010 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 GG07/05/10
Initial Release
Sophia Kao
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TABLE OF CONTENTS
2
1. Precautions and Safety Notices .......................................................................................3
2. Specification .....................................................................................................................6
3. Front Panel Function Control Description ...................................................................14
4. Circuit Description...........................................................................................................16
5. Adjusting Procedure ....................................................................................................... 18
6. Trouble Shooting Flow Chart.......................................................................................... 53
7. Block Diagrams ..............................................................................................................57
8. Schematic Diagrams ......................................................................................................58
9. PCB Layout Diagrams ...................................................................................................61
10. Exploded Diagram And Spare Parts List ..................................................................... 62
11. Recommended Spare Parts List .................................................................................66
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1. Precautions and Safety Notices
3
Safety Instructions
The symbol is intended to alert the user to presence of un-insulated
“Hazardous Voltage” within the product’s enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
This symbol is intended to alert the user that improper use of the product
may result in product malfunction. The user should pay attention to avoid
accidents or unnecessary problems.
Wet Location
Apparatus shall not be exposed to dripping or splashing and that no objects filled
with liquids, such as vases, shall be placed on the apparatus.
Outdoor Use
WARNING: To reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture.
Disconnect Device - The Mains Plug or An Appliance Coupler
The mains plug or an appliance coupler is used as the disconnect device for
disconnection from the mains, the disconnect device shall remain readily
operable.
Safety
Operate the Monitor on 100V and 120 V AC only.
Use the AC power cord specified by ViewSonic and suitable for the voltage where
you use it.
The plug is designed, for safety purposes, to fit into the wall outlet only one way.
If you are unable to insert the plug fully into the outlet, contact your dealer.
If any liquid or solid object should fall inside the cabinet, stop operating, unplug the
Monitor immediately and have it checked by qualified service technician.
If you will not be using the Monitor for a long time, disconnect the power by pulling
the plug itself. Do not pull on the cord.
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Carrying The LCD Monitor
4
To prevent dropping the Monitor and causing serious injury, you must follow these
guidelines:
Disconnect all cables before carrying the Monitor.
Carrying the large size Monitor requires at least two or three people.
When you carry the Monitor, place your hands as illustrated and hold it securely.
Do not put stress on the LCD panel and the frame around the screen.
When carrying the Monitor, do not subject it to shocks, vibration, or excessive
force.
When lifting or moving the Monitor, hold it securely from the bottom. Place your
palm directly under the panel.
Installed on the wall
Installed with stand
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Leave at least this space around the set. Do not install the Monitor set as follows:
5
Air circulation is blocked.
Broken pieces
Do not throw anything at the LCD.
Doing so may break the screen glass and cause serious injury.
If the surface of the LCD cracks, unplug the AC power cord before touching the
LCD. Otherwise electric shock may result.
Handling of broken glass and liquid crystal leakage
If the LCD panel gets damaged, crystalline liquid leakage may occur, or scattered
broken glass may result.
Do not touch broken glass or crystalline liquid which is toxic, with bare hands as
cuts, poisoning or skin irritation may occur.
Also do not glass fragments or leaked crystalline liquid get into your eyes or mouth.
Should either contacted your eyes or mouth, rinse the contacted area thoroughly
with water and consult your doctor.
Note
This television includes a QAM demodulator, which should allow you to receive
unscrambled digital cable television programming via subscription service to a
cable service provider.
The type of programming and signal provided by your cable service provider will
affect the availability of digital cable television programming in your area.
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2. Product Specification
6
2.1 Product definition
Product Name ViewSonic VX2739W-2
Model Number VS12843
English
French
German
Spanish
Italian
OSD Languages
TFT LCD Panel and Model # 1st source : CMO M270H1-L01
Scalar 1. TSUMO88GDI-LF-1
Input Signal D-Sub /DVI
Sync Compatibility Separate Sync / Composite Sync / SOG
Adapter Internal Power Board
Power Cable (Refer to APPENDIX B) Yes
15 pin mini D-SUB Analog Cable (1.8 m, black),
with PC 2001.
Finnish
Russian
Japanese
Korean
Traditional Chinese
Simplified Chinese
2. TSUMU58EHI-LF-1
Yes
(Detached cable; refer the Appendix A)
DVI-D Cable(1.8m, black) with PC 2001
(refer to Appendix A)
Audio Cable(1.8m, black) with PC 2001 No
MIC Cable(1.8m, black) with PC 2001 No
USB Cable (V2.0)
(1.8m, black) with PC 2001
Yes
Yes
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7
2.2 Specification
Dimensions (with stand)
Physical(W)x(H)x(D)
Weight 6.8 kg
LCD 27" Color active matrix TFT LCD
Pane CMO M270H1-L01
Contrast Ratio 1200 :1 (Typ.)
Display area 597.89 mm (H) x 336.31 mm (V)
Pixel Pitch 0.3114 mm (H) x 0.3114 mm (V) pixel
Native Resolution 1920 x 1080
647 mm (W) x 490 mm (H) x 250 mm (D)
2.3 Front View and Rear View
No
Name Photo Materials Piece Texture Color Scheme
.
1 Front
ABS 1 POLISH # 8000 Viewsonic black
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8
Power
3
button ring
4 Neck
5 Key button
ABS 1 electroplate silver
ABS 1 POLISH # 8000 Viewsonic black
ABS 1
Mold-Tech
MT-11010
Viewsonic black
6 base
7 base_ring
Power
8
button
ABS 1 POLISH # 8000 Viewsonic black
ABS 1 electroplate silver
Translucen
t
PC
1 POLISH # 8000
1. Black by
painting at
core-side
surface.
2.Power icon by
Lacer-engraving
and then painting
pantone # 427C
3. Blue LED.
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** ViewSonic Black_matt
9
L* a* b*
27.47 -0.06 -0.8
*CIE1976; Polish level = 1200; Follow the Equipment in ViewSonic Lab
*1. The reference for the cabinet components is the color chip provided by ViewSonic.
*2. The color difference between any two panel head cabinet components shall be ∆E <0.8, in the 1976
CIE L*a*b Colorspace.
*3. The color difference between any two base cabinet components shall be ∆E <0.8, in the 1976 CIE
L*a*b Colorspace.
2.4 Electrical Requirement
Horizontal / Vertical Frequency
Horizontal Frequency 24 – 83 KHZ
Vertical Refresh Rate 50 – 76 HZ
Maximum Pixel Clock Analog : 210 MHz
Digital : 180 MHz
Sync Polarity Independent of sync polarity.
Support Timing Table
Digital - TMDS
Analog
Composite
Separated
Item Timing
SOG
640 x 350 @ 70 Hz, 31.5 KHz v v v v DMT.
For Separated、 SOG and
Composite sync, switch
1.
640x350@70,640x400@70,
Remark
and720x400@70 by [1]+[2]
short cut key ( primary =
720x400@70)
640 x 400 @ 60 Hz, 31.5 KHz v v v v DMT
2.
For Separate, Composite
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and SOG sync, switch
10
640x400@60Hz and
640x480@60Hz by [1]+[2]
short cut key (primary =
640x480@60Hz)
640 x 400 @ 70 Hz, 31.5 KHz v v v v DMT
For Separated、 SOG and
Composite sync, switch
3.
640x350@70,640x400@70,
and720x400@70 by [1]+[2]
short cut key ( primary =
720x400@70)
4. 640 x 480 @ 50 Hz, 24.7 KHz v v v v CVT
640 x 480 @ 60 Hz, 31.5 KHz v v v v DMT
For Separate, Composite
and SOG sync, switch
5.
640x400@60Hz and
640x480@60Hz by [1]+[2]
short cut key (primary =
640x480@60Hz)
6. 640 x 480 @ 67 Hz, 35 KHz v v v v For MAC
7. 640 x 480 @ 72 Hz, 37.9 KHz v v v v DMT
8. 640 x 480 @ 75 Hz, 37.5 KHz v v v v DMT
720 x 400 @ 70 Hz, 31.5 KHz v v v v DMT
For Separated、 SOG and
Composite sync, switch
640x350@70,
9.
640x400@70,
and720x400@70 by [1]+[2]
short cut key ( primary =
720x400@70).
10. 720 x 480 @ 60 Hz, 31.5 KHz v DTV
11. 720 x 576 @ 50 Hz, 31.3 KHz v v v v DTV
12. 800 x 600 @ 56 Hz, 35.2 KHz v v v v DMT
13. 800 x 600 @ 60 Hz, 37.9 KHz v v v v DMT
14. 800 x 600 @ 72 Hz, 48.1 KHz v v v v DMT
15. 800 x 600 @ 75 Hz, 46.9 KHz v v v v DMT
16. 832 x 624 @ 75 Hz, 49.7 KHz v v v v MAC
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1024 x 768 @ 50 Hz, 39.6 KHz v v v v CVT
11
For Separate, Composite
and SOG sync, Switch
1024x768@50Hz and
17.
1280x768@50Hz by [1]+[2]
short cut key (primary =
1024x768@50Hz)
1024 x 768 @ 60 Hz, 48.4 KHz v v v v DMT;
For Separate, Composite
and SOG sync,
Switch 1280x768@60Hz
18.
and 1024x768@60Hz and
1360x768@60Hz and
1366x768@60Hz by [1]+[2]
short cut key (primary =
1360x768@60Hz )
19. 1024 x 768 @ 70 Hz, 56.5 KHz v v v v DMT
20. 1024 x 768 @ 72 Hz, 58.1 KHz v v v v DMT
1024 x 768 @ 75 Hz, 60 KHz v v v v DMT;
For Separated , Composite
and SOG,
Switch 1280x768@75Hz
21.
and 1024x768@75Hz by
[1]+[2] short cut key
(primary =
1280x768@75Hz)
22. 1024 x 768 @ 75 Hz, 60.2 KHz v v v v For MAC
23. 1152 x 864 @ 75 Hz, 67.5 KHz v v v v DMT
24. 1152 x 870 @ 75 Hz, 68.7 KHz v v v v For MAC
25. 1152 x 900 @ 67 Hz, 62.5 KHz v v v v For SUN
26. 1280 x 720 @ 50 Hz, 37.5 KHz v v v v DTV
27. 1280 x 720 @ 60 Hz, 45 KHz v v v v DTV
1280 x 768 @ 50 Hz, 39.6 KHz v v v v DMT
For Separated and
28.
Composite sync, Switch
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1024x768@50Hz and
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1280x768@50Hz by [1]+[2]
12
short cut key (primary =
1024x768@50Hz)
1280 x 768 @ 60 Hz, 47.8 KHz v v v v DMT;
For Separate, Composite
and SOG sync,
Switch 1280x768@60Hz
29.
and 1024x768@60Hz and
1360x768@60Hz and
1366x768@60Hz by [1]+[2]
short cut key (primary =
1360x768@60Hz )
1280 x 768 @ 75 Hz, 60.3 KHz v v v v DMT;
For Separated , Composite
and SOG,
Switch 1280x768@75Hz
30.
and 1024x768@75Hz by
[1]+[2] short cut key
(primary =
1280x768@75Hz)
31. 1280 x 800 @ 60 Hz, 49.7 KHz v v v v DMT
32. 1280 x 800 @ 75 Hz, 62.8 KHz v v v v DMT
33. 1280 x 960 @ 50 Hz, 49.4 KHz v v v v DMT
34. 1280 x 960 @ 60 Hz, 60.0 KHz v v v v DMT
35. 1280 x 960 @ 75 Hz, 75.2 KHz v v v v DMT
36. 1280 x 1024 @ 50 Hz, 52.7 KHz v v v v DMT
37. 1280 x 1024 @ 60 Hz, 64 KHz v v v v DMT
38. 1280 x 1024 @ 75 Hz, 80 KHz v v v v DMT
1360 x 768 @ 60 Hz, 47.7 KHz v v v v DMT
For Separate, Composite
and SOG sync,
Switch 1280x768@60Hz
39.
and 1024x768@60Hz and
1360x768@60Hz and
1366x768@60Hz by [1]+[2]
short cut key (primary =
1360x768@60Hz )
40. 1366 x 768 @ 59.79 Hz, 47.7 KHz v v v v DMT
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For Separate, Composite
13
and SOG sync,
Switch 1280x768@60Hz
and 1024x768@60Hz and
1360x768@60Hz and
1366x768@60Hz by [1]+[2]
short cut key (primary =
1360x768@60Hz )
41. 1440 x 900 @ 60 Hz 55.9 KHz v v v v DMT
42. 1440 x 900 @ 75 Hz 70.6 KHz v v v v DMT
1400 x 1050 @ 60 Hz 65.3 KHz v v v v DMT;
For Separated , Composite
and SOG,
43.
Switch 1400x1050@60Hz
and 1680x1050@60Hz by
[1]+[2] short cut key
(primary =
1680x1050@60Hz)
44. 1400 x 1050 @ 75 Hz 82.3 KHz v v v v DMT
45. 1600 x 1200 @ 60 Hz 75.0 KHz v v v v DMT
46. 1680 x 1050 @ 60 Hz 64.7 KHz v v v v DMT
1680 x 1050 @ 60 Hz 65.3 KHz v v v v DMT;
For Separated , Composite
and SOG,
Switch 1400x1050@60Hz
47.
and 1680x1050@60Hz by
[1]+[2] short cut key
(primary =
1680x1050@60Hz)
48. 1920x1080 @ 60 Hz 67.5 KHz v v v v DMT
49. 480i @ 60 Hz
50. 480p @ 60 Hz
51. 576i @ 50 Hz
52. 576p @ 50 Hz
53. 720p @ 50 Hz
54. 720p @ 60 Hz
55. 1080i @ 50 Hz
56. 1080i @ 60 Hz
57. 1080p @ 50 Hz
58. 1080p @ 60 Hz
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3. Front Panel Function Control Description
14
3.1 Front Panel Hardware Controls
Power Switch AC Power Switch on the back cover
Soft Power Switch on the front bezel
Power LED (Front Head) Blue – ON
Amber – Active Off
Dark = Soft Power Switch OFF
Front Panel Controls (Head)
[ 1 ] [ 2 ] [ ] [▲] [▼]
[ ] Power
[ 1 ] Button 1
[ 2 ] Button 2
[▲] Up arrow button
[▼] Down arrow button
Note: Power Button, Button 1 and Button 2
must be one-shot logic operation. (i.e. there
should be no cycling)
Reaction Time OSD must fully appear within 0.5s after
pushing Button 1
3.2 Short Cuts Function from the button
[1] Main Menu
(refer to segment 3.3)
[2] Input toggle (Analog or DVI; refer to Appendix D)
[▼] To immediately activate Contrast / Brightness OSD Menu.
[▲] To immediately activate Contrast / Brightness OSD Menu.
[▼]+ [▲] In the BT / CR mode, recall both Contrast and Brightness
[1] + [2] Toggle 720x400 and 640x400 mode when input 720x400
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to default in its menu without OSD message. (Under
Contrast or Brightness adjust sub-menu, recall Contrast or
Brightness to its default without OSD message.)
* While OSD menu off, recall CR/ BT to default without OSD
message
or 640x400 mode
* Default = 720 x 400
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[1] + [▼] + [▲]
15
White Balance
(Keep pushing 5 sec)
1. It will not shown on user’s guide
2. OSD message as below,
(Image = no blanking)
3. Recommend environment
3.1. Optical (Best) input timing = 640 x 480 @ 60Hz;
Following timing modes also recommended,
800 x 600 @ 60 Hz
1024 X 768 @ 60 Hz
3.2. Pattern as below,
[1] + [▲] OSD Lock / Unlock (refer to segment 3.4)
[1] + [▼] Power Lock / Unlock (refer to segment 3.5)
[2] + [▼] Toggle DDC/CI and DDC/2B (DDC/CI enable/disable) and
show following message for 3 seconds,
When switch to DDC/CI
When switch to DDC/2B
Default = DDC/CI
Signal + [2] + [ ] Factory Mode
Remark : All the short cuts function are only available while OSD off
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16
4. Circuit Description
CON3
CON1
CON5 CON6
J6
CON7
CON8 CON2
J4 or
J7
J3
Power Circuit：
Power board provided +5VD(CON1.1~CON1.2) and +5V (CON3~CON4),Which
+5V is for system and LCD Panel,+5VD provided for Audio AMP.
At AC power on status,Power off mode and standby mode,Power source only
provided +5V to TSUMO88GDI,Monitor total power consumption will be less the
1W.
The status for +5VD and +5V as below：
+5V will provide：
1. via Q4、Q3：VLCD(for LCD panel)
2. via U9 transferred to +3.3V(for TSUMO88GDI and system related parts)
3. via U9 transferred to +1.8V(for TSUMO88GDI)
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+5VD will provide：
17
1. via J6 to USB HUB(for GL805G)
Backlight Control：
CON1.9 is inverter on/off control pin,which 5V is ON,0V is OFF；CON1.10 is
Brighthess control pin,control way is PWM,0% is darkest,100% is brilliant.
LCD panel power and signal：
CON5 is FFC connector which provided for LCD panel LVDS,the LVDS singnal
sent from TSUMO88GDI.
VIDEO：
The outputs for video are CON8、CON2 as below：
CON8：DVI
CON2：D-SUB
These signals will transmit to TSUMO88GDI,transferred to LVDS, to LCD Panel
via CON5 for programming.
KEYPAD & LED DISPLAY：
CON3 is KEY and LED board connector, controlled way for key board is from
ADC, build in TSUMO88GDI. When user press the buttons, identified by
TSUMO88GDI fordifferent voltage to control the right action by TSUMO88GDI.
Controlled way for LED board is from GPIO, Power off：LED is dark, Power on：
LED is blue light, standby mode：LED is orange light, which controlled by
TSUMO88GDI.
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5. Adjusting Procedure
18
5.1 Function Control Description
5.1.1 Main Menu OSD Table
Main Menu
Level 1 Level 2 Level 3
Auto Image Adjust
1. Key button definition:
[1]: OSD off
[2]: Execute the selected function
[Up]: Rolling up the slider
(When push the button on the top position,
the slider shall go down to the bottom item)
[Dn]: Rolling down the slider
(When push the button on the bottom
position, the slider shall go down to the top
item)
2. Under sRGB or DCR mode, the
Contrast/Brightness shall be disabled with
fate-out color. And it should not be selected.
1. Background = blanking
2. The message OSD
position is at the center.
3. After auto tune, OSD shall
be off
4. Only for analog mode
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Contrast/Brightness
19
Contrast
1. Adjust range = 0 to 100
2. Default = 70
3. Key button definition:
[1] = Back to Main Menu or
OSD off
(depend on previous
Key button definition:
[1]: Back to previous OSD
status
[2]: select to adjust value
setting.
[Up]: Move up the slider
[Dn]: Move down the slider
status)
[Up] = Increase the OSD
value setting
[Dn] = Decrease the OSD
value
[Up]+[Dn]: Recall to default
Brightness
1. Adjust range = 0 to 100
2. Default = 100
3. Key button definition:
[1] = Back to Main Menu or
OSD off
(depend on previous
status)
[Up]: Increase the OSD value
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setting
[Dn]: Decrease the OSD value
[Up]+[Dn]: Recall to default
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Input Select
20
D-SUB
Step 1: Turn off OSD.
Step 2:
1. Target video input port =
Analog
2. If signal detected from
1. Show on existing input
port by white-background
color
2. Key button definition:
[1]: Back to previous OSD
status
[2]: Change to the selected
input port
[Up]: Move up the slider
[Dn]: Move down the slider
target port, change to
target port.
3. If no signal detected from
target port, keep existing
input port.
Step 3: Show on Input
Message OSD at the
right-top corner of screen for
1 second.
DVI
Step 1: Turn off OSD.
Step 2:
1. Target video input port =
Digital
2. If signal detected from
target port, change to
target port.
3. If no signal detected from
target port, keep existing
input port.
Step 3: Show on Input
Message OSD at the
right-top corner of screen for
1 second.
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