ViewSonic VX2739wm-1, VX2739WM-CN, VS12843 Schematic
Service Manual
ViewSonic VX2739wm-1
VX2739wm-CN
Model No. VS12843
27” Color TFT LCD Display
(VX2739wm-1_VX2739wm-CN_SM Rev. 1a May. 2010)
ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
Copyright
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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.
Product disposal at end of product life
The lamp in this product contains mercury. Please dispose of in accordance with local, state
or federal laws.
Revision History
Revision SM Editing Date ECR Number Description of Changes Editor
1a 5/7/2010 Initial Release Eden Chang
TABLE OF CONTENTS
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1. Precautions and Safety Notices.......................................................................................4
2. Specification .....................................................................................................................8
3. Front Panel Function Control Description ...................................................................17
4. Circuit Description...........................................................................................................20
5. Adjusting Procedure .......................................................................................................22
6. Trouble Shooting Flow Chart..........................................................................................68
7. Block Diagrams ..............................................................................................................74
8. Schematic Diagrams ......................................................................................................75
9. PCB Layout Diagrams ...................................................................................................78
10. Exploded Diagram And Spare Parts List .....................................................................79
11. Recommended Spare Parts List .................................................................................80
1. Precautions and Safety Notices
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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
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:
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
2.1 Product definition
Product Name ViewSonic VX2739WM
Model Number VS12843
English
French
German
Spanish
Italian
OSD Languages
Finnish
Russian
Japanese
Korean
Traditional Chinese
Simplified Chinese
TFT LCD Panel and Model # 1st source : CMO M270H1-L01
Scalar TSUMO88GDI-LF-1
Input Signal D-Sub /DVI/HDMI
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.
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 Yes
MIC Cable(1.8m, black) with PC 2001 No
USB Cable (V2.0)
(1.8m, black) with PC 2001
Yes
Yes
2.2 Specification
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Dimensions (with
647 mm (W) x 490 mm (H) x 250 mm (D)
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
Speaker Output 2W x 2
2.3 Front View and Rear View
N
Name Photo Materials Piece Texture Color Scheme
o.
POLISH #
1 Front
ABS 1
Viewsonic black
8000
Mold-Tech
MT-11020
2 Back
ABS 1
Viewsonic black
(Logo is
POLISH #
8000)
Power
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3
button ring
ABS 1 electroplate silver
4 Neck
5 Key button
6 base
ABS 1
Viewsonic black
8000
Mold-Tech
POLISH #
ABS 1
Viewsonic black
MT-11010
POLISH #
ABS 1
Viewsonic black
8000
7 base_ring
Power
8
button
ABS 1 electroplate silver
1. Black by
painting at
core-side
surface.
Transluce
nt
1
POLISH #
8000
2.Power icon by
Lacer-engravin
PC
g and then
painting
pantone # 427C
3. Blue LED.
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** ViewSonic Black_matt
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 Audio Interface (Speaker Specification)
Line input signal 1.0 Vrms @1kHz
Line input impedance 10 Kohm
Maximum Amp power output (Watt) 2.4 W @ SPKVDD=5V 4OHM
Amp -THD < 10 % THD @1kHz
Speaker Power rating(Ω/Watt) 4Ω/ 2 W
Signal to Noise Ratio 50 db
Frequency response Fo – 20kHz
SPL. 91 dB (at 0.1w/0.1m)
FO 820 Hz
1. 3.5 mm stereo jack
Line input connection
2. HDMI
There should be no audible vibration
Vibration
resonance at volume=100% & any
Freq.
There should be no affect on the screen
Screen image
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 off when the rest of the
monitor is in power saving
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2.5 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
Item Timing
640 x 350 @ 70 Hz, 31.5 KHz v v v v DMT.
1.
640 x 400 @ 60 Hz, 31.5 KHz v v v v DMT
2.
Analog
Composite
Separated
SOG
Digital - TMDS
Remark
For Separated、 SOG and
Composite sync, switch
640x350@70,640x400@70,
and720x400@70 by [1]+[2]
short cut key ( primary =
720x400@70)
For Separate, Composite
and SOG sync, switch
640x400@60Hz and
640 x 400 @ 70 Hz, 31.5 KHz v v v v DMT
3.
640x480@60Hz by [1]+[2]
short cut key (primary =
640x480@60Hz)
For Separated、 SOG and
Composite sync, switch
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 CVT
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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
9.
640x350@70,640x400@70,
and720x400@70 by [1]+[2]
short cut key ( primary =
720x400@70).
720 x 480 @ 60 Hz, 31.5 KHz v v v v DTV, For Analog sync, the
10.
information OSD shows
640x480
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
1024 x 768 @ 50 Hz, 39.6 KHz v v v v CVT
For Separated and
Composite sync, Switch
17.
1024x768@50Hz and
1280x768@50Hz by [1]+[2]
short cut key (primary =
1024x768@50Hz)
18. 1024 x 768 @ 60 Hz, 48.4 KHz v v v v DMT
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
21. 1024 x 768 @ 75 Hz, 60 KHz v v v v DMT;
For Separated , Composite
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and SOG,
Switch 1280x768@75Hz
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
Composite sync, Switch
28.
29.
30.
1024x768@50Hz and
1280x768@50Hz by [1]+[2]
short cut key (primary =
1024x768@50Hz)
1280 x 768 @ 60 Hz, 47.8 KHz v v v v DMT;
For Composite and SOG,
Switch 1280x768@60Hz
and 1360x768@60Hz by
[1]+[2] short cut key
(primary =
1280x768@60Hz)
1280 x 768 @ 75 Hz, 60.3 KHz v v v v DMT;
For Separated , Composite
and SOG,
Switch 1280x768@75Hz
and 1024x768@75Hz by
[1]+[2] short cut key
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
(primary =
1280x768@75Hz)
34. 1280 x 960 @ 60 Hz, 60.0 KHz v v v v DMT
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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
1366 x 768 @ 60 Hz, 47.7 KHz v v v v DMT
For Composite and SOG,
Switch 1280x768@60Hz
39.
and 1360x768@60Hz by
[1]+[2] short cut key
(primary =
1280x768@60Hz)
40. 1440 x 900 @ 60 Hz 55.9 KHz v v v v DMT
41. 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,
Switch 1400x1050@60Hz
42.
and 1680x1050@60Hz by
[1]+[2] short cut key
(primary =
1680x1050@60Hz)
43. 1400 x 1050 @ 75 Hz 82.3 KHz v v v v DMT
44. 1600 x 1200 @ 60 Hz 75.0 KHz v v v v DMT
45. 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
46.
and 1680x1050@60Hz by
[1]+[2] short cut key
(primary =
1680x1050@60Hz)
47. 1920x1080 @ 60 Hz 67.5 KHz v v v v DMT
48. 480i @ 60 Hz
9
49. 480p @ 60 Hz 9 9 9 9
50. 576i @ 50 Hz
9
51. 576p @ 50 Hz 9 9 9 9
52. 720p @ 50 Hz 9 9 9 9
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53. 720p @ 60 Hz 9 9 9 9
54. 1080i @ 50 Hz
55. 1080i @ 60 Hz
56. 1080p @ 50 Hz 9 9 9 9
57. 1080p @ 60 Hz 9 9 9 9
*1. Tolerance ±2KHz. (if no over lapping issue)≧
*2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD
message without blanking
9
9
3. Front Panel Function Control Description
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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 4-6-3)
[2] Input toggle (Analog or DVI or HDMI; refer to refer to
EDID Text)
[▼] To immediately activate Audio Adjust menu.
[▲] To immediately activate Contrast / Brightness OSD
Menu.
[▼]+ [▲] 1. In the Audio mode, recall both of Volume and Mute
to default without OSD message.( Under Volume
adjust sub-menu, recall Volume to default without
OSD message.)
2. In the BT / CR mode, recall both Contrast and
Brightness 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/ Audio volume
and mute to default without OSD message
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[1] + [2] Toggle 720x400 and 640x400 mode when input
720x400 or 640x400 mode
* Default = 720 x 400
[1] + [▼] + [▲]
(Keep pushing 5 sec)
White Balance
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 4-6-4)
[1] + [▼] Power Lock / Unlock (refer to segment 4-6-5)
[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
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Default = DDC/CI
Signal + [2] + [ ] Factory Mode
Remark : All the short cuts function are only available while OSD off
4. Circuit Description
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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、audio AMP and system related
parts)
3. via U9 transferred to +1.8V(for TSUMO88GDI)
+5VD will provide：
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1. via Q3：+5VA(for audio AMP)
2. 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.
AUDIO：
The outputs for Audio are CON7、CON6、J4、J3, CON7 is I2S digital signal,
which proceed to TSUMO88GDI, transferred to internal signals, to U12(Audio
AMP),to speaker via CON6, or earphone via J4.
VIDEO：
The outputs for video are CON7、CON8、CON2 as below：
CON7：HDMI
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
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
Contrast/Brightness
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Contrast
1. Adjust range = 0 to 100
2. Default = 70
3. Key button definition:
[1] = Back to Main Menu or
OSD off
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
(depend on previous
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
setting
[Dn]: Decrease the OSD value
[Up]+[Dn]: Recall to default
Input Select
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D-SUB
Step 1: Turn off OSD.
Step 2:
1. Target video input port =
Analog
2. If signal detected from
target port, change to
target port.
3. If no 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, 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.
HDMI PC
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Step 1: Turn off OSD.
Step 2:
1. Target video input port =
HDMI PC
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.
HDMI A V
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Step 1: Turn off OSD.
Step 2:
1. Target video input port =
HDMI AV
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.
Note: HDMI input default
setting is HDMI AV, and
user can change to HDMI
PC and saved.
Audio Adjust
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1. The selected icon in Mute
Volume
will be highlighted
2. Key button definition:
[1]: Back to previous OSD
status
[2]: selected audio setting
[Up]: Move up the slider
[Dn]: Move down the slider
3. No signal, no output
1. Adjust range = 0 to 100
2. Default = 50
3. Key button definition:
[1]: Back to Audio Adjust OSD
[Up]: Increase the volume
setting
[Dn]: Decrease the volume
setting
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