381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583
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Copyright
Copyright
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.
2003 by ViewSonic Corporation. All rights reserved. No part of this publication may be
¤
Revision History
RevisionDateDescription Of ChangesApproval
1a 25/12/03 Initial Release DCN- 3742 Angela Luh
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TABLE OF CONTENTS
1. Precautions and Safety Notices
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
5. Adjusting Procedure
6. Trouble Shooting Flow Chart
7. Recommended Spare Parts List
8. Exploded Diagram And Spare Parts List
9. Block Diagram
10. Schematic Diagrams
11. PCB Layout Diagrams
1
2
3
5
15
18
20
28
32
33
42
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1. Precaution & Safety Notice
WARNING!
This service information designed for experienced repair technicians only and is not designed for use by the
general public.
It does not contain warnings or cautions to avoid non-technical individuals of potential dangers in
attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians.
Any attempt to service or repair the product or products dealt within this service information by anyone else
could result in serious injury or death.
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
. LEAKAGE CURRENT HOT CHECK
3-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check.
3-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part and a good
earth ground.
3-3 Use an AC voltmeter with 1000 ohm / volt or more
combination 1500 ohm resistor and 0.15uF capacitor.
3-4 Move the resistor connection to each exposed metallic part and measure the voltage.
3
-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement.
3-6 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 .
AC VOLTMETER
sensitivity and measure the AC voltage across the
V
0.15u
.
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To Metal Parts
1500 10W
1
Earth Ground
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2. Specification
Mechanical :
Dimension ( W x H x D ) mm
Set : a. with stand: 377.6 x 374 x 195.6 mm
b. Without stand: 377.6 x 311.8 x 56.9 mm
Slim bezel: 19.0 / 19.0 / 19.0/21.0
Base (L X W): 195.6 x 201 mm
Packing : ( W x H x D ) mm: 450 x 522 x 135 mm
Weight : Net / Gross ( Kg ): 4.1 / 5.2
Wall Mount (VESA): 100 x 100 mm
LCD Panel type: CPT / CLAA170EA03
Color Temperatures RGB: 6500°K (default) / 9300°K 5400°K / User R,G,B
Plug & Play: DDC1/2B interface
Scaler chip: Mstar MST8116a
AC Power range: 90 V ~ 264 V, 50 Hz / 60 Hz
Power consumption: < 45W green / < 1W amber
(On / Off mode)
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3. Front Panel Function Control Description
Main Menu
With OSD controls
Front Control Panel
shown below in detail
Displays the control screen for the
highlighted control. Also toggles
between two controls on some screens.
Also a shortcut to auto image adjust
Displays the Main Menu or
exits the control screen
and saves adjustments.
Power light
Green = ON
Orange =
Power Saving
Power On / Off
Scrolls through menu options and
adjusts the displayed control.
Also a shortcut to display the
Contrast adjustment control screen.
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Main Menu Controls
Adjust the menu items shown below by using the up and down buttons.
A. Auto Image Adjust automatically sizes, centers, and fine tunes the video signal to eliminate waviness and
distortion. Press the [2] button to obtain a sharper image.
NOTE: Auto Image Adjust works with most common video cards. If this function does not work on your
LCD display, then lower the video refresh rate to 60 Hz and set the resolution to its pre-set value.
B. Contrast adjusts the difference between the image background (black level) and the foreground (white
level).
C. Brightness adjusts the lamps current to control the screen brightness.
D. Color Adjust
you to adjust red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500° Kelvin).
9300K — Adds blue to the screen image for cooler white (used in most office settings with fluorescent
lighting).
5400K — Adds red to the screen image for warmer white and richer red.
Custom User Color — Individual adjustments for red, green, and blue.
1 To select color (R, G or B) press button [2].
2 To adjust selected color, press or .
3 When you are finished making all color adjustments, press button [1] twice.
provides several color options: preset color temperatures and Custom User Color which allows
E. Information displays the timing mode (video signal input) coming from the graphics card in your computer.
See your graphic card’s user guide for instructions on changing the resolution and refresh rate (vertical
frequency). VESA 1280 x 1024 @ 60 Hz (recommended) means that the resolution is 1280 x 1024 and the
refresh rate is 60 Hertz.
F. Manual Image Adjust
H. Size (Horizontal Size) adjusts the width of the screen image.
NOTE: Vertical size is automatic with your LCD display. H./V. Position adjusts horizontal and vertical position of the screen image. You can toggle between
Horizontal and Vertical by pressing button [2]. Horizontal move s the screen image to the left or to the right.
Vertical moves the screen image up and down.
Fine Tune sharpens focus by aligning the illuminated text and/or graphic characters.
Sharpness adjusts the clarity and focus of the screen image.
Setup Menu controls are explained below:
Language allows you to choose the language used in the menus and control screens.
Resolution Notice displays the recommended resolution for this LCD display.
Enable allows the Resolution Notice to appear on-screen.
Disable will not allow the Resolution Notice to appear on-screen.
OSD Timeout sets the length of time an on-screen display screen is displayed. For example, with a“15
G. OSD Position allows you to move the on-screen display menus and control screens.
H. Memory Recall
Preset Timing Mode listed in this user guide.
controls are explained below:
second” setting, if a control is not pushed within 15 seconds, the display OSD
disappears.
returns adjustments to the original factory settings if the display is operating in a factory
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PIN
MNEMONI
SIGNAL
1RVRed Video
2GVGreen Video
3BVBlue Video
4NCNone5GND
Ground(DDC return)
6RGRed GND
7GGGreen GND
8BGBlue GND
9
+5V
+ 5V (for DDC)
10SGSync GND
11NCNone
12
SDA
DDC Data
13HSHorizontal Sync
14VSVertical Sync
15
SCL
DDC Clock
4. Circuit Description
4-1. Outline
POWER On/Off , LED, Button"2" , Up arrow- button , Down arrow button , Button"1" , button , Down arrow
button , Button"1" , on the front panel.
Video signal connector, audio line-in receptacle and AC-IN are located on the back side of the cabinet.
l OSD menu includes the following function;
AUTO IMAGE ADJUST
CONTRAST / BRIGHTNESS
COLOR ADJUST
INFORMATION
MANUAL IMAGE ADJUST
SETUP MENU
MEMORY RECALL
l CONTRAST and BRIGHTNESS can be directly controlled with UP / DN key.
4-2. CONNECTORS
l AC inlet : CEE22 typed connector
l Video signal connector 15P Mini D-Sub
162738495
1617
11
121314
CN6
10
DB15HD
15
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4-3. ELECTRICAL SPECIFICATIONS
l Standard conditions
Display Area 338 x 270 mm
Video Signal 0.7 Vpp
Contrast Max.
Brightness Max.
l
Ambient
Input AC
Warming up > 30 min
Display 1280 x 1024
POWER
- Power supply
Input Voltage 90 -240 ~Volts
Power Frequency
Input current
Inrush current 90A(max.) at 230Vac
Power consumption 50Watt
Output Voltage @0-4.8A load 12Vdc
(08-09) ID Manufacturer Name = VSC
(10-11) Product ID Code (Non-Alphanumerical) =
F518
(12-15) Last 5 Digits of Serial Number = NOT SPECIFIED
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2003
(10-17) Complete Serial Number = NOT SPECIFIED
(18) EDID Structure Version Number = 1
(19) EDID Structure Revision Number = 3
(20) VIDEO INPUT DEFINITION : =
Separate Sync, Analog signal, 0.700V/0.300V (1.000 Vp-p)
(21) Maximum Horizontal Image Size = 340mm
(22) Maximum Vertical Image Size = 270mm
(23) Display Gamma = 2.20
(24) DPMS Supported Feature: = Active Off.
Display type = RGB color display
(25-34) CHROMA INFO:
Red x = 0.633 Green x = 0.300 Blue x = 0.146 White x = 0.313
Red y = 0.336 Green y = 0.586 Blue y = 0.103 White y = 0.329
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(35) ESTABLISHED TIMING I:
720 x 400 @ 70Hz (VGA, IBM)
640 x 480 @ 60Hz (MAC II, Apple)
640 x 480 @ 67Hz (VESA)
640 x 480 @ 72Hz (VESA)
640 x 480 @ 75Hz (VESA)
800 x 600 @ 56Hz (VESA)
800 x 600 @ 60Hz (VESA)
(36) ESTABLISHED TIMING II:
800 x 600 @ 72Hz (VESA)
800 x 600 @ 75Hz (VESA)
832 x 624 @ 75Hz (MAC II, Apple)
1024 x 768 @ 60Hz (VESA)
1024 x 768 @ 70Hz (VESA)
1024 x 768 @ 75Hz (VESA)
1280 x 1024 @ 75Hz (VESA)
(37) Manufacturer's Reserved Timing:
1152 x 870 @ 75Hz (MAC II, Apple)
(38-53) Standard Timing Identification:
#1: 1280 x 1024 @60Hz
#2: 1280 X 960 @60HZ
#3: 1152 X 864 @75HZ
#4: (44) not specified
#5: (46) not specified
#6: (48) not specified
#7: (50) not specified
(08-09) ID Manufacturer Name = VSC
(11-10) Product ID Code = F618
(12-15) Last 5 Digits of Serial Number = Not Used
(16) Week of Manufacture = 01
(17) Year of Manufacture = 2003
(10-17) Complete Serial Number = See Descriptor Block
(18) EDID Version Number = 1
(19) EDID Revision Number = 3
(20) VIDEO INPUTDEFINITION:
Separate Syncs, Analog singal, 0.700V/0.300V(1.000 Vp-p)
(21) Maximum Horizontal Image Size = 340 mm
(22) Maximum Vertical Image Size = 270 mm
(23) Display Gamma = 2.20
(24) Power Management and Supported Feature(s):
Active Off/Very Low Power, Standard Default Color Space,
Preferred Timing Mode
Display Type = R/G/B Color
(25-34) CHROMA INFO:
Red X - 0.637 Green X - 0.310 Blue X - 0.143 White X - 0.313
Red Y - 0.344 Green Y - 0.582 Blue Y - 0.100 White Y - 0.329
(35) ESTABLISHED TIMING I:
720 X 400 @ 70Hz (IBM,VGA)
640 X 480 @ 60Hz (IBM,VGA)
640 X 480 @ 67Hz (Apple,Mac II)
640 X 480 @ 72Hz (VESA)
640 X 480 @ 75Hz (VESA)
800 X 600 @ 56Hz (VESA)
800 X 600 @ 60Hz (VESA)
(36) ESTABLISHED TIMING II:
800 X 600 @ 72Hz (VESA)
800 X 600 @ 75Hz (VESA)
832 X 624 @ 75Hz (Apple,Mac II)
1024 X 768 @ 60Hz (VESA)
1024 X 768 @ 70Hz (VESA)
1024 X 768 @ 75Hz (VESA)
1280 X 1024 @ 75Hz (VESA)
(37) Manufacturer's Reserved Timing:
1152 X 870 @ 75Hz (Apple,Mac II)
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(38-53) Standard Timing Identification:
1280 X 1024 @60Hz
1280 X 960 @60Hz
1152 X 864 @75Hz
Not Used
Not Used
Not Used
Not Used
Not Used
(54-71) Detailed Timing / Descriptor Block 1:
Horizontal Image Size: 338 mm Vertical Image Size: 270 mm
Refreshed Mode: Non-Interlaced Normal Display - No Stereo
Digital Separate, Horizontal Polarity (+) Vertical Polarity (+)
(72-89) Detailed Timing / Descriptor Block 2:
Monitor Serial Number:
A34030100001
(90-107) Detailed Timing / Descriptor Block 3:
Monitor Range Limits:
Min Vertical Freq - 50 Hz
Max Vertical Freq - 75 Hz
Min Horiz. Freq - 30 KHz
Max Horiz. Freq - 80 KHz
Pixel Clock - 140 MHz
Secondary GTF - Not Supported
(108-125) Detailed Timing / Descriptor Block 4:
Monitor Name :
VE710b
(126) No Extension EDID Block(s)
(127) CheckSum OK
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4-6. THEORY OF OPERATION
This section describes the function of the LCD monitor per functional block.
This monitor includes MB board, inverter board, adapter and button board.
l
MB Board
The MB board is a four-layer, single-landed design with ground and internal planes provided. DC power from the
power adapter enter the board through DC jack. Other connectors on the board are for inverter, audio and button
board .The VGA cable is a signal cable that contains video signal, sync signal and DDC signal from PC VGA
adapter. This system board consists of 4 functional areas : flat panel controller, flash ROM , power regulator and
Audio amplifier
l
Flat panel controller… MST8116A (U3)
The heart of the system board is mstar MST8116A. The MST8116A is a graphics processing IC for LCD
monitor. It provides all key IC functions required for LCD panel. On-chip functions include a high-speed
triple-ADC , PLL, high scaling engine, OSD controller and on -chip micro controller.
a) Clock Generation :
Crystal Input Clock (TCLK and XTAL). This is the input pair to an internal crystal oscillator and
corresponding logic. A 14.318 MHz crystal is recommended.
b) Analog to Digital Converter:
The MST8116A chip has three ADC's (analog-to-digital converters), one for each color (red, green and
blue) .The analog RGB signals are connected to
MST8116A as described
below
Pin Name Pin Number
Red + 63
Red - 62
Green + 60
Green - 59
Blue + 58
Blue - 57
c) OSD : The MST8116A has a fully programmable ,high-quality OSD controller. The on-chip static
RAM(4096 words by 24 bits) stores the cell map and the cell definitions.
d) MTV312 Micro controller: The MTV312 micro controller(MCU) serves as the system micro controller. It
programs the MST8116A and manages other devices in the system such as the keypad, the backlight, LED,
audio and non-volatile RAM. using general purpose input/output (GPIO) pins.
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e) Panel Power Sequencing ( VDDCTRL1, 2) ( Pin 32, 3) : The MTV312 has two dedicated outputs
Pin number Pin Name Pin Number Usage
21 P1.3 Key / Power on ,off
13 P3.4 NV_RAM (U4) SDA
14 P3.5 NV_RAM (U4) SCL
25 P1.7 Key_down
9 P6.3 Key_right
24 P1.6 Key_up
16 P6.2 Key_left
37 P4.1 Key_mute
34 P5.6 VGA connector
23 P1.5 Key_select
42 P5.3 LED_red
41 P5.4 LED_green
32 P6.6 LCD panel power1 on / off control
3 P5.0 LCD panel power2 on / off control
36 P4.0 Backlight on / off control
VDDCTRL1 and 2 ( Pin32 and Pin3) to control LCD power sequencing once data and control signals
are stable.
f) Panel interface (Pin 1~25, Pin75~128) : The MTV312 driver interface is highly programmable. It supports
dual bus / dual port for SXGA drivers.
l
Power Regulator MC34063A (U6),AIC1739 (Q4) :
The MC34063A is a monolithic control IC containing the primary functions required for DC to DC
internal temperature converters. The device consists of an compensated reference, comparator, controlled duty
cycle. Oscillator with an active current sense circuit. Desired output voltage are determined by the equation,
Volt = 1.25 ( 1 + R67 / R66), In this case, the output voltage are 3.3 Volts
The AIC1739 is a low dropout positive adjustable regulator with minimum of 300mA output current capability.
So it is well suited for 3.3 V and 2.5 V Regulator.
4-7 Power/Inverter Board
This is a specific power/inverter for L7VC monitor 50W 12V 4.16A output power and backlight which
converts 12 Vdc to drive four cold cathode fluorescence tubes.
l
Inverter Electrical specification described as below
Input
Rated Input Voltage 12Vdc
Input Voltage Range 11.4 ~ 12.6 Vdc
Input Current <2A
Off state Input Power <0.1W
On / Off control Voltage 2~3.3 for on , 0~1 for off
Output
Rated Output Strike-on Voltage 1500Vrms
Rated Output Voltage 710Vrms at 6mA
Rate Output Frequency 40~50KHz
Rated Ourput Current 6~7 mA
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l
Power
This is a general purpose AC / DC adapter which converter 90~240 Vac to a stabilized DC voltage 12 V with
rated output current of 4.16A . Electrical specification described as below.
Rated Input Voltage 90~240 Vac , 50 / 60Hz
Operation Input Voltage 90~260 Vac , 47 ~ 63Hz
Input Current <1.5A
Inrush Current <100A@120Vac
Standby Input Voltage 12Vdc
Output Voltage Regulation +/-5%
Output Ripple & Noise 120mVp-p
Rate Output Current <4.16A
Turn-on delay <3secs
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item.
5. Adjusting Procedure
OSD Function Menu
1. Main Menu
Press “1” Button (Menu Button) to enter Main Menu:
Press Up Button to the previous page or Down Button to the next page .
Press “1” Button to exit Main Menu.
(1) Auto Image Adjust Page:
Press “2” Button to do auto image adjust function.
Press “1” Button to exit the page.
(2) Contrast/Brightnes Page:
Press “2” Button to enter Contrast Item.
Press “1” Button to exit the page.
1) Contrast Item
Press Up Button to make contrast high.
Press Down Button to make contrast low.
Press “2” Button to enter Brightness Item.
Press “1” Button to exit the item.
2) Brightness Item
Press Up Button to make brightness high.
Press Down Button to make brightness low.
Press “2” Button to enter Contrast Item.
Press “1” Button to exit the item.
(3) Color Adjust Page:
Press “2” Button to enter Color Adjust page.
Press “1” Button to exit the page.
Press Up Button to the previous item or Down Button to the next
1) sRGB Item
2) 9300K Item
3) 6500K Item
4) 5400K Item
Press “2” Button to select current Item.
Press “1” Button to exit current item.
5) User Color Item
Press “2” Button to enter User Color item.
Press “1” Button to exit User Color item.
Red,Green,Blue Options:
Press “2” Button to switch among the options.
Press “1” Button to exit the options.
Press Up Button to make current option high.
Press Down Button to make current option low.
(4) Information Page:
Press “2” Button to show the information.
Press “1” Button to exit Information page.
(5) Manual Image Adjust Page:
Press “2” Button to enter Manual Image Adjust page.
Press “1” Button to exit Manual Image Adjust page.
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Press Up Button to the previous item or Down Button to the next item.
1)
H./V. Position Item
Press “2” Button to enter H./V. Position item.
Press “1” Button to exit H./V. Position item.
Horizontal Position Option:
a)
Press “2” Button to enter the Vertical Position option.
Press “1” Button to exit Horizontal Position option.
Press Up Button to make current option high.
Press Down Button to make current option low
b)
Vertical Position Option:
Press “2” Button to enter the Horizontal Position option.
Press “1” Button to exit Vertical Position option.
Press Up Button to make current option high.
Press Down Button to make current option low
2)
Horizontal Size Item
Press “2” Button to enter Horizontal Size item.
Press “1” Button to exit Horizontal Size item.
Press Up Button to make current item high.
Press Down Button to make current item low.
3)
Fine tune Item
Press “2” Button to enter Fine tune item.
Press “1” Button to exit Fine tune item.
Press Up Button to make current item high.
Press Down Button to make current item low.
Sharpness Item
4)
Press “2” Button to enter Sharpness item.
Press “1” Button to exit Sharpness item.
Press Up Button to make current item high.
Press Down Button to make current item low.
(6) Setup Menu Page:
Press “2” Button to enter Setup Menu page.
Press “1” Button to exit Setup Menu page.
Press Up Button to the previous item or Down Button to the next item.
1)
Language Select Item
Press “2” Button to enter Language Select item.
Press “1” Button to exit Langua ge Select item.
Press Up Button to the previous option or Down Button to the next
option.
English,French Option
Press “2” Button to select the language.
Press “1” Button to exit the option.
Resolution Notice Item
2)
Press “2” Button to enter Resolution Notice item.
Press “1” Button to exit Resolution Notice item.
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Enable,Disable Option
Press “2” Button to select the option.
Press “1” Button to exit the option
Press Up Button to the previous option or Down Button to the next
option.
3) OSD Position Item
Press “2” Button to enter OSD Position item.
Press “1” Button to exit OSD Position item.
a) Horizontal Position Option
Press “2” Button to enter the Vertical Position option.
Press “1” Button to exit Horizontal Position option.
Press Up Button to make current option high.
Press Down Button to make current option low
b) Vertical Position Option:
Press “2” Button to enter the Horizontal Position option.
Press “1” Button to exit Vertical Position option.
Press Up Button to make current option high.
Press Down Button to make current option low
4) OSD Time Out Item
Press “2” Button to enter OSD Time Out item.
Press “1” Button to exit OSD Time Out item.
Press Up Button to make OSD time out long.
Press Down Button to make OSD time out short.
5) OSD Background Item
Press “2” Button to enter OSD Background item.
Press “1” Button to exit OSD Background item.
Enable,Disable Option
Press “2” Button to select the option.
Press “1” Button to exit the option.
Press Up Button to the previous option or Down Button to the next
option.
(7) Memory Recall Page
Press “2” Button to do the memory recall function.
Press “1” Button to exit the page.
2. Other Menu:
(1) Contrast Dialog
Press Down Button to enter the Contrast Dialog.
Press “1” Button to exit the Contrast Dialog.
Press “2” Button to enter the Brightness Dialog.
Press Up Button to make contrast high.
Press Down Button to make contrast low.
(2) Auto Image Adjust Dialog
Press “2” Button to do the auto image adjust function.
Main BoardScaler board1
Power board power board / inverter1
Cartoncarton1
Polyform (L)end cap( L)1
Polyform ( R ) end cap( R) 1
PE bagPE bag1
ID labelID label on carton1
CD wizardCD + user menu1
Rear enclosure monitor back cover 1
Front enclosureMonitor front bezel 1
BaseBase ass'y1
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
LCD panelCPT LCD panel 1
Button board ass'ybbutton boatd1
Main BoardScaler board1
Power board power board / inverter1
Cartoncarton1
Polyform (L)end cap( L)1
Pilyform ( R ) end cap( R) 1
PE bag PE bag 1
ID labelID label on carton1
CD wizardCD + user menu1
Rear enclosure monitor back cover 1
Front enclosureMonitor front bezel 1
Base Base ass'y 1
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
Screw ( To assembly the cabinet)Screw
LCD panelCPT LCD panel 1
Button board ass'ybbutton boatd1