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 aregistered 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
1a 01/16/2006 Initial release Jamie Chang
Description of Changes Editor
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TABLE OF CONTENTS
1. Precautions and Safety Notices 1
2. Specification 4
3. Front Panel Function Control Description
4. Circuit Description 14
5. Adjustment Procedure 24
6. Troubleshooting Flow Chart 50
7. Block Diagram 51
8. Recommended Spare Parts List 61
9. Exploded Diagram and Exploded Parts List 65
10. Schematic Diagrams 66
11. PCB Layout Diagrams 72
11
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1. Precautions and Safety Notices
1.1 SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user’s safety comes first.
However, improper use or installation may cause damage to the monitor as well as the user.
Carefully go over the following WARNINGS before installing and keep this guide handy.
WARNINGS
.This monitor should be operated only at the correct power sources indicated on the label on
the rear end of the monitor. If you’re unsure of the power supply in your residence, consult
you local dealer or power company.
.Use only the special power adapter that comes with this monitor for power input.
.Do not try to repair the monitor your self as it contains no user-serviceable parts. This
monitor should only be repaired by a qualified technician.
.Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric
shock to human bodies, even when the power cord is unplugged.
.Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
.Put your monitor only in a clean, dry environment. If it gets wet, unplug the power
cableimmediately and consult your service technician.
.Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth. Apply
non-ammonia based cleaner onto the cloth, not directly onto the glass screen.
.Keep the monitor away from magnetic objects, motors, TV sets, and transformer.
.Do not place heavy objects on the monitor or power cord.
1.2 PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections
and the protection afforded by them cannot necessarily be obtained by using replacement
components rated for higher voltages, wattage, etc. Before replacing any of these
components read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as specified in the parts list may
create shock, fire ,or other hazards.
1.3 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires around terminals before
soldering.
2. When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in
circuit board, keep the resistor about 5mm away from circuit board.
3. Keep wires away from high voltage, high temperature components and sharp edges.
4. Keep wires in their original position so as to reduce interference.
5. Usage of this product please refer to also user’s manual.
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1.4 HANDING AND PLACING METHODS
Correct Methods: Incorrect Methods:
Only touch the metal frame of the LCD
panel or the front cover of the monitor. Do
not touch the surface of the polarizer.
Surface of the LCD panel is pressed by fingers
and that may cause “Mura. ”
Take out the monitor with cushions
Taking out the monitor by grasping the LCD
panel. That may cause “Mura.”
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Place the monitor on a clean and soft foam
pad.
Placing the monitor on foreign objects. That
could scratch the surface of the panel or cause
“Mura.”
Place the monitor on the lap, the panel
surface must be upwards.
The panel is placed facedown on the lap. That
may cause “Mura.”
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2. Specification
2.1 PRODUCT SPECIFICATIONS
LCD Panel 17.0” TFT
Input Signal Analog / Digital
Pixel Dimension 0.264(H) x 0.264(V)mm
LCD Display Color 16.2M Colors (RGB 6-bit+FRC data)
Viewing Angle
Contrast Ratio
Horizontal: 150
Vertical: 135 °
700:1 (Typ.)
°
Brightness 300 cd/㎡(Typ.)
Response Time 8ms(Typ.)
Active Display Area 337.9 (H) x 270.3 (V)
Maximum Pixel Clock 135 MHz
Recommend Resolution 1280 x1024@60Hz
Horizontal Frequency 30 – 82 kHz
Vertical Refresh Rate 50 – 75 Hz.
Temperature
Audio Input 1 x 2 Watts
Power Management
Power
Operating: 0°C to +40°C
Storage: -20°C to +60°C
Energy Star compliant VESA
DPMS compatible
<1 W
Input Voltage : 90V~264V
Consumption: 40 Watts(Max.) 35 Watts(Typ.)
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2.2 FACTORY SUPPORTING MODES
Timing Table Primary Presets
Item Timing Analog Digital
1 640 x 350 @ 70Hz, 31.5kHz Yes Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes Yes
4 640 x 480 @ 50Hz, 24.7kHz Yes Yes
5 640 x 480 @ 60Hz, 31.5kHz Yes Yes
6 640 x 480 @ 67Hz, 35.0kHz Yes Yes
7 640 x 480 @ 72Hz, 37.9kHz Yes Yes
8 640 x 480 @ 75Hz, 37.5kHz Yes Yes
9 640 x 480 @ 85Hz, 43.27kHz Yes Yes
10 720 x 400 @ 70Hz, 31.5kHz Yes Yes
11 800 x 600 @ 56Hz, 35.1kHz Yes Yes
12 800 x 600 @ 60Hz, 37.9kHz Yes Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes Yes
14 800 x 600 @ 72Hz, 48.1kHz Yes Yes
15 800 x 600 @ 85Hz, 53.7kHz Yes Yes
16 832 x 624 @ 75Hz, 49.7kHz Yes Yes
17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes
18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes
19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes
20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes
21 1024 x 768 @ 85Hz, 68.67kHz Yes Yes
22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes
23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes
24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes
25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes
26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes
Primary Preset: VESA : 1280 x1024@60Hz
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3. Front Panel Function Control Description
Main Menu
with OSD controls
Front Control Panel
shown below in detail
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Do the following to adjust the display setting:
g
1. To display the Main Menu, press button: [1]
NOTE: All OSD menus and adjustment screens disappear automatically after about 30
seconds. This is adjustable through the OSD timeout setting in the setup menu.
2. To select a control to adjust, press ▲ or ▼ to scroll up or down the Main Menu.
3. After the desired control is selected, press button [2]. A control screen like the one shown
below appears.
The line at the bottom of the screen shows
the current functions of buttons 1 and 2:
Exit or select the Bri
htness control.
4. To adjust the setting, press the up ▲ or down ▼ buttons.
5. To save the adjustments and exit the menu, press button [1] twice.
The following tips may help you optimize your display:
.Adjust your computer’s graphic card so that is outputs a 1280×1024@60Hz video signal to
the LCD display.(Look for instructions on “changing the refresh rate” in the graphics card’s
user guide.)
.If necessary, make small adjustments using H. Position and V. Position until the screen
image is completely visible.
(The black border around the edge of the screen should barely
touch is illuminated “active area” of the LCD display.)
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Main Menu Control
Adjust the menu items shown below by using up ▲ or down ▼ buttons.
Control explanation:
Auto Image Adjust automatically sizes, centers, and fine tunes the video
signal to eliminate waviness and distortion. Press the [2] button to obtain a
shaper image.
Note:
1. 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.
2. The Auto Image Adjust and most Manual Image Adjust functions are not
available for DVI input.
Contrast adjust the different between the image background
(black level) and the foreground (white level).
Brightness adjusts background black level of the screen image.
Input Select allows the user to togglebetween an analog and a digital signal.
Color Adjust provides several color adjustment modes, including preset
color temperatures and a User Color mode which allows independent
adjustment of red (R), green (G), and blue (B). The factory setting for this
product is 6500K (6500 Kelvin).
sRGB — sRGB is quickly becoming the industry standard for color
management, with support being included in many of the latest applications.
Enabling this setting allows the LCD display to more accurately display colors
the way they were originally intended. Enabling the sRGB setting will cause
the Contrast and Brightness adjustments to be disabled.
9300K — Adds blue to the screen image for cooler white (used in most office
setting with fluorescent lighting).
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6500K — Adds red to the screen image for warmer white and richer red.
5400K — Adds green to the screen image for a darker color.
User Color — Individual adjustments for red (R), green (G), and blue (B).
1. To select color (R, G or B) press button [2].
2. To adjust selected color , press ▲ or ▼.
Important: If you select RECALL from the Main Menu when the product is
set to a Preset Timing Mode, colors return to the 6500K factory preset.
Information displays the timing mode (video signal input) coming from the
graphics card in the computer, the LCD model number, the serial number,
®
and the ViewSonic
website URL. See your graphics card’s user guide for
instructions on changing the resolution and refresh rate (vertical frequency).
NOTE: VESA 1280×1024@60Hz (rec ommended) means that the resolution
is 1280×1024 and the refresh rate is 60Hz.
Manual Image Adjust displays the Manual Image Adjust menu.
The Manual Image Adjust controls are explained below: H./V. Position(Horizontal/Vertical Postion) moves the screen image left or
right and up or down.
H. Size(Horizontal Size) adjusts the width of the screen image.
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Fine Tune sharpens focus by aligning the text and/or graphics with pixel
boundaries.
Sharpness adjusts the clarity and focus of the screen image.
Setup Menudisplay the menu shown below.
The Setup Menu controls are explained below:
Language Select allows the user to choose the language used is the menus
and control screens.
Resolution Notice displays the Resolution Notice menu shown below.
Resolution Notice advises the optimal resolution to use.
OSD Position allows the user to move the OSD menus and control screens.
OSD Timeout sets the length of time the OSD screen is displayed. For
example, with a “15 second” setting, if a control is not pushed within 15
seconds, the display screen disappears.
OSD Background allows you to turn the OSD background On or Off.
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Memory Recall returns adjustments back to factory settings if the display is
operating in a factory Preset Timing Mode listed in the Specifications of this
manual.
Exception: This control does not affect changes mode with the User Color
control, Language Select or Power Lock setting.
Short Cut Key
Function key: 5 keys
Remark : All the short cuts function are only available while OSD off.
Main Menu
Input toggle (Analog / Digital)
Audio Adjust
Toggle 720x400 and 640x400 mode when input
720x400 or 640x400 mode
White Balance. (Not shown on user’s guide)
Power Lock
OSD Lock
Factory Mode
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4. Circuit Description
Power Board
Flat Panel and
RS232 Connector
mode
AC-IN
OSC
Backli
ght and
P
anel
Keyboard
Audio board
OSC
4.1 LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a Main Board, an Power Board, an Audio Board, Key
Board which house the flat panel control logic, brightness control logic and DDC.
Monitor Block Diagram
(Include: adapter, inverter)
CCFL Drive.
CCFL backlight
Main Board
For white balance
adjustment in factory
Video signal, DDC
100V-240V
Key Board
Audio Board
HOST Computer
4.2 MAIN BOARD BLOCK FUNCTION DESCRIPTION
The main board contains panel control logic, brightness control logic, DDC and DC
convert DC circuit and so on.
R
G
B
H
V
SDA
SCL
PWPC board
RTD2523
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14
MCU
EPROM
Page 18
4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION
Start Circuit
PWM
Over
PWM
DC Convert
PWPC board combines to adapter and inverter, Adapter which commonly consists of
bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and convert to
12V, 5V DC voltage by input 90V-240V AC voltage that provide power supply for each
chips in the main board and inverter. Inverter is DC TO AC circuit. It changes the 12v DC
of power supply to about 600-800v AC that drives the backlight. It mostly consists of
starting circuit, PWM controller, DC changing circuit, LC surging circuit, output circuit and
protection circuit etc.
AC input
EMI filter
Bridge
Rectifier
and Filter
Transformer
Rectifier
CMOS
Lamp
R903, R904,R905
Control IC
OSC and
Output
Circuit
Feedback
Circuit
Circuit
Over
Voltage
5V
12V
Voltage
Protect
ON/OFF
MOSFET
Q203
ON/OFF
Control
Control IC
DIM
CN902
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4.4 INTRODUCTION OF IC
RTD2523-LF(IC101): integrate ADC, OSD, SCALER, LVDS, convert analog RGB into
digital and room and shrink scaling output to LCD panel.
PIN Function:
Pin Symbol Description
1 XO Reference clock output
2 XI Reference clock input
3 DPLL_GND Ground for digital PLL
4 DPLL_VDD Power for digital PLL(3.3v)
5 APLL_VDD Power for multi-phase PLL(3.3v)
6 PLL_TEST1 Test Pin 1/IRQ#
7 PLL_TEST2 Test Pin 2/Power-on-latch for crystal
out Frequency
8 APLL_GND Ground for multi-phase PLL
9 PWM1/TMDS_TST PWM1/TMDS_TEST Pin/Power-on
latch for serial/parallel port
11、13、
TMDS_VDD 3.3V
19、26
12 EXT_RES Impedance Match Reference
14 RX2P Differential Data Input
15 RX2N Differential Data Input
17 RX1P Differential Data Input
18 RX1N Differential Data Input
20 RX0P Differential Data Input
21 RX0N Differential Data Input
23 RXCP Differential Data Input
24 RXCN Differential Data Input
51 PWM2/TCON[2]/S[3] PWM2/TCON[2]/SDIO[3]
55 PWM2/TCON[13]/COUT PWM2/TCON[13]/Crystal out
113 PWM2/TCON[12]/COUT PWM2/TCON[12]/Crystal out
47 PWM1/DDCSDA/TCON[1]/BBLU[0] PWM1/DDC serial control I/F data
input/output/TCON[4]
125 PWM1/DDCSDA2/TCON[7] PWM1/DDC serial control I/F data
input/output/TCON[7]
112 PWM0 / REFCLK PWM0(In/out)test pin for DCKL/Video
8 even-odd signal
54 SDIO[0] Serial control I/F data in/Parallel port
data[0]
53 SDIO[1]/TCON[4]/BBLU[0] Parallel port data[1]/TCON[4]/TTL
BBLU[0]
52 SDIO[2]/TCON[3]/BBLU[1] Parallel port data[2]/TCON[3]/TTL
BBLU[1]
51 SDIO[3]/PWM2/TCON[2] Parallel port data[1]/TCON[4]/PWM2
50 SCLK Serial control I/F clock
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111 SCSB Serial control I/F chip select
56 RESET RESET putput for Micron
46 DDCSCL / TCON[0] / BBLU[1] DDC serial control I/F clock/TCON[0]/
TTL BBLU[1]
47 DDCSDA / TCON[1] / pWM1 /
BBLU[0]
DDC serial control I/F data input/out/
CON[1] / Pwm1/TTL BBLU[0]
126 DDCSCL2 / TCON[5] DDC serial control I/F clock /
TCON[5]
125 DDCSDA2 / TCON[7] / pWM1 DDC serial control I/F data
input/out/TCON[7] / pWM1
28 ADC_REFIO ADC band-gap voltage de-coupling
29 ADC_VDD Analog power(3.3v)
30 BLUE+ Analog input from BLUE channel
31 BLUE- Analog input ground from BLUE
channel
33 SOG / ADC_ TEST SOG in / ADC test pin
34 GREEN+ Analog input from GREEN channel
35 GREEN- Analog input ground from GREEN
channel
36 ADCB_VDD Analog power(3.3V)
37 RED+ Analog input from RED channel
38 RED- Analog input ground from RED
channel
41 ADC_VDD Analog power(3.3V)
42 AHS Analog HS input
43 AVS Analog VS input
49、121
58、71、
3.3V Power VCCIO: 2
3.3V Power PVCC: 5
83、95、
110
45、69、
2.5V Power VCCK: 4
98、127
AIC1084-33PM (U101): DC power convert, used to 5v convert 3.3v.
RT9164(U102): DC power convert, used to 5v convert 2.5v.
MTV512GMV64(U104):The MTV512M micro-controller is an 8051 CPU core embedded
device especially tailored for flat panel display applications. It includes an 8051
CPU core, 768-byte SRAM, 4 channels of 6-bit ADC, 3 external
counters/timers, 6 channels of PWM DAC, VESA DDC interface, and a
64K-byte internal program Flash-ROM memory.
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30 General purpose I/O (Standard 8051/CMOS)
31 General purpose I/O (Standard 8051/CMOS)
32 General purpose I/O (Standard 8051/CMOS)
33 General purpose I/O (Standard 8051/CMOS)
34 General purpose I/O (Standard 8051/CMOS)
35 General purpose I/O (Standard 8051/CMOS)
36 General purpose I/O (Standard 8051/CMOS)
General purpose I/O/External Counter/Timer2
37
(Standard 8051/CMOS)
38 3.3V power
TDA7496L(U201): The TDA7496L is a stereo 2W+2W class AB power amplifier
assembled in the @ Powerdip, driving speakers as low as 8. The function of
each pin and the inside circuit diagram are as follows:
Block Diagram
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PIN Function
SG6841 (IC901): This highly integrated PWM controllers, Low start up current 30 uA. The
circuit unit has functions such as over-current protection, over-temperature protection,
over-voltage protection, output short-circuit protection and etc. The function of each pin
and the inside circuit diagram are as follows:
Pin/ No.
Pin
Name
Function Pin Description
1 GND Ground Ground.
2 FB Feedback
3 VIN Start-Up
4 Ri
Reference
Setting
The signal from external compensation circuit is feed into
this pin. The PWM duty cycle is determined by this FB pin
and current sense signal from Pin 6.
This pin is pulled high to the rectified line input through a
resistor for start-up. Since the start-up current requirement
for SG6841 is very small, a large start-up resistance can
be used to minimize power loss. Under normal operation,
this pin is also used to detect line voltage to compensate
for constant output power limit for universal AC input.
A resistor from RI pin to ground will generate a constant
current source for SG6841. This current is used to charge
an internal capacitor and hence the switching frequency
are determined. Increasing the resistance will decrease the
current source and reduce the switching frequency,. A 26k
Ω resistor R1 creates a 50uA constant current L1 and
generates 65kHz switching frequency.
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5 RT
Temperature
Protection
For over-temperature protection. An external NTC
thermistor is connected from this pin to ground. The
impedance of the NTC will decrease under high
temperature. Once the voltage on RT pin drops below a
fixed limit, the PWM output will be disabled.
6 SENSE Current Sense
Current sense. The sensed voltage is used for current
mode control and pulse-by-pulse current limiting.
7 VDD Power supply Power Supply.
8 GATE Driver Output
The totem-pole output driver for the power MOSFET. A soft
driving waveform is implemented to improve EMI.
Block Diagram
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TL1451(U201): PWM control, voltage range for working: 3.6~35V, Has such functions as
short-voltage protection, Over-voltage protection, over-current protection and etc.
The function of each pin and the circuit diagram inside are as follows:
Pin Symbol
1 CT
2 RT
3 1IN+
4 1IN-
5 1FBK
6 1DTC
7 1OUT
8 GND
Description Pin Symbol
External timing capacitor
External timing resistor
Positive input for error amplifier 1
Positive input for error amplifier 2
Error amplifier 1 output
Output 1 dead time/soft start
setting
Output 1
Ground
9 VCC
10 2OUT
11 2DTC
12 2FBK
13 2IN+
14 2IN-
15 SCP
16 REF
Description
Power supply
Output 2
Output 2 dead time/soft start setting
Error amplifier 2 output
Positive input for error amplifier
Positive input for error amplifier
Timing latch setting
Reference voltage output (2.5v)
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5. Adjustment Procedure
5.1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
1. Approximately 30 minutes should be allowed for warm up before proceeding.
2. Adjustments should be undertaken only on those necessary elements since most of them
have been carefully preset at the factory.
3. ESD protection is needed before adjustment.
5.2 MAIN ADJUSTMENTS
NO. FUNCTIONS DESIGNATION
1. White Balance Function Key
2. GEOMETRY Function Key
5.3 ALIGNMENT PROCEDURES
Approximately 30 minutes should be allowed for warm up before proceeding
White-Balance adjustment.
1.Adjust of White Balance
1.)、How to do the Chroma-7120 MEM .Channel setting
A、Reference to chroma 7120 user guide
B、Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the
TEXT description Following is the procedure to do white-balance adjust
2)、Setting the color temp. You want
A、MEM.CHANNEL9 ( 9300 color):
9300 color temp. parameter is Wx = 0.283 ±0.03;Wy = 0.298 ±0.03;
Y =250 ±20 cd/m
2 ,
B、MEM.CHANNEL10 ( 6500 color):
6500 color temp. parameter is Wx = 0.313±0.03;Wy = 0.329 ±0.03;
2,
Y = 250 ±20 cd/m
C、MEM.CHANNEL 11 ( 5400 color):
5400 color temp. parameter is Wx = 0.335±0.03;Wy = 0.350 ±0.03;
2,
Y = 250 ±20 cd/m
3)、Into factory mode of VX712
A、First Power off, then press Switch 2 button along with press Power button will activate
the factory mode, then MCU will do AUTO LEVEL automatically. Meanwhile press
MENU the OSD screen will located at LEFT TOP OF PANEL.
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4)、Bias adjustment :
Set the Contrast
Adjust the Brightness
to 70
to 100.
5)、Gain adjustment :
Move cursor to “-F-” and press MENU key
A、Adjust 9300 color-temperature
(1)、Switch the Chroma-7120 to RGB-Mode (with press “MODE” button )
(2)、Switch the MEM. channel to Channel 9 ( with up or down arrow on chroma 7120 )
(3)、The LCD-indicator on chroma 7120 will show x = 0.283 ±0.03, y =0.298 ±0.03,
2
Y = 250 ±20 cd/m
(4)、Adjust the RED of color1 on factory window until chroma 7120 indicator reached
the value R=100
(5)、Adjust the GREEN of color1 on factory window until chroma 7120 indicator
reached the value G=100
(6)、Adjust the BLUE of color1 on factory window until chroma 7120 indicator reached
the value B=100
(7)、Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the
tolerance =100±5
B、Adjust 6500 color-temperature
(1)、Switch the chroma-7120 to RGB-Mode (with press “MODE” button )
(2)、Switch the MEM .channel to Channel 10( with up or down arrow on chroma 7120 )
(3)、The LCD-indicator on chroma 7120 will show x = 0.313 ±0.03, y = 0.329 ±0.03, Y
2
= 250 ±20 cd/m
(4)、Adjust the RED of color3 on factory window until chroma 7120 indicator reached
the value R=100
(5)、Adjust the GREEN of color3 on factory window until chroma 7120 indicator
reached the value G=100
(6)、Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached
the value B=100
(7)、Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the
tolerance =100±5
C、Adjust 5400 color-temperature
(1) Switch the chroma-7120 to RGB-Mode (with press “MODE” button )
(2)、Switch the MEM .channel to Channel 11( with up or down arrow on chroma 7120 )
(3)、The LCD-indicator on chroma 7120 will show x = 0.335 ±0.03, y = 0.350 ±0.03, Y
2
= 250 ±20 cd/m
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(4)、Adjust the RED of color3 on factory window until chroma 7120 indicator reached
the value R=100
(5)、Adjust the GREEN of color3 on factory window until chroma 7120 indicator
reached the value G=100
(6)、Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached
the value B=100
(7)、Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the
tolerance =100±5
D、Press reset key and Turn the Power-button “off to on” to quit from factory mode.
2. Geometry
1).Set cross-hatch pattern and preset timing as timing table listed.
2).Change to each mode in turn and wait for the monitor finish auto-alignment and save
press before change to next mode.
3).Until all of modes are adjusted,exit OSD menu and press PWR OFF to exit factory
mode.
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5.4 Factory Defaults
Item Defaults Item Defaults
Contrast 70% Sharpness 33%
Brightness 100% OSD H. Position 50%
Volume 50% OSD V. Position 50%
Balance 50% OSD Time Out 15 Sec
Bass 50% OSD Background On
Treble 50% OSD PIVOT Off
Color Temperature 6500K Resolution Notice Enabled 720x400/640x400 720x400
5.5 Function Test
1 Product: 17” LCD Monitor
2 Test Equipment: Color Video Signal & Pattern (or PC with SXGA resolution and a sound
card)
3 Test Condition: Before function test and alignment, each LCD Monitor should be warmed
up for at least 30 minutes with the following conditions:
(a)In room temperature,
(b) With full-white screen, RGB, and Black
(c) With cycled display modes,
1 640 x 350 @ 70Hz, 31.5kHz Yes Yes
2 640 x 400 @ 60Hz, 31.5kHz Yes Yes
3 640 x 400 @ 70Hz, 31.5kHz Yes Yes
4 640 x 480 @ 50Hz, 24.7kHz Yes Yes
5 640 x 480 @ 60Hz, 31.5kHz Yes Yes
6 640 x 480 @ 67Hz, 35.0kHz Yes Yes
7 640 x 480 @ 72Hz, 37.9kHz Yes Yes
8 640 x 480 @ 75Hz, 37.5kHz Yes Yes
9 640 x 480 @ 85Hz, 43.27kHz Yes Yes
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10 720 x 400 @ 70Hz, 31.5kHz Yes Yes
11 800 x 600 @ 56Hz, 35.1kHz Yes Yes
12 800 x 600 @ 60Hz, 37.9kHz Yes Yes
13 800 x 600 @ 75Hz, 46.9kHz Yes Yes
14 800 x 600 @ 72Hz, 48.1kHz Yes Yes
15 800 x 600 @ 85Hz, 53.7kHz Yes Yes
16 832 x 624 @ 75Hz, 49.7kHz Yes Yes
17 1024 x 768 @ 60Hz, 48.4kHz Yes Yes
18 1024 x 768 @ 70Hz, 56.5kHz Yes Yes
19 1024 x 768 @ 72Hz, 58.1kHz Yes Yes
20 1024 x 768 @ 75Hz, 60.0kHz Yes Yes
21 1024 x 768 @ 85Hz, 68.67kHz Yes Yes
22 1152 x 864 @ 75Hz, 67.5kHz Yes Yes
23 1152 x 870 @ 75Hz, 68.7kHz Yes Yes
24 1280 x 1024 @ 60Hz, 63.4kHz Yes Yes
25 1280 x 1024 @ 75Hz, 79.97kHz Yes Yes
26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes Yes
Function Test Display Pattern
Item Test Content Pattern Specification Remark
1
Frequency &
Tracking
Fine Line Moire
2 Contrast/Brightness 16 Gray Scale
Eliminate visual wavy
noise.
16 gray levels sh should
be distinguishable.
Figure 1
Figure 2
Horizontal and Vertical
3 Boundary
Horizontal&Vertical
Thickness
position of video should
be adjustable to be
Figure 3
within the screen frame.
RGB Color
4
Performance
Screen Uniformity &
5
Flicker
6 Dead Pixel/Line
RGB Color Intensities
Full White
White Screen & Dark
Screen
Contrast of each R, G,
B, color should be
normal.
Should be compliant
with the spec.
The numbers of dead
pixels should be
compliant with the spec.
Figure
4,5,6
Figure 7
Figure
7,8
The screen must have
7 White Balance White & Black Pattern
the pure white and black
Figure 9
pattern, no other color.
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Fine Line Morie Pattern (Figure1) Gray Scale Pattern (Figure2)
Horizontal & Vertical Thickness Pattern R. Color Pattern (Figure 4)
(Figure 3)
G. Color Pattern (Figure 5) B. Color Pattern (Figure 6)
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Full White Pattern (Figure 7) Dark Screen Pattern (Figure 8)
Black-White Pattern (Figure 9)
4.3 Function Test and Alignment Procedure
All Modes Reset
You should do “All Mode Reset” (Refer to Chapter III-3. Hot Keys for Function
Controls) first. This action will allow you to erase all end-user’s settings and restore
the factory defaults.
Auto Image Adjust
Please select and enter “Auto Image Adjust” function on Main Menu to see if it is
workable. The “Auto Image Adjust” function is aimed to offer a better screen quality
by built-in ASIC. For optimum screen quality, the user has to adjust each function
manually.
Firmware
Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls)
- Make sure the F/W is the latest version.
DDC
Test Pattern: EDID program
Make sure it can pass test program.
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Fine Tune and Sharpness
Test Signal: 1280*1024@60Hz
Test Pattern: Line Moire Pattern
Check and see if the image has noise and focus performs well. Eliminate visual line
bar.
If not, readjust by the following steps:
(a)Select and enter “Fine Tune” function on “Manual Image Adjust” to adjust the
image to eliminate visual wavy noise.
(b)Then, select and enter “Sharpness” function to adjust the clarity and focus of the
screen image.
Boundary
Test Signal: 1280*1024@60Hz
Test Pattern: Horizontal & Vertical Line Thickness Pattern
Check and see if the image boundary is within the screen frame.
If not, readjust by the following steps:
(a)Select and enter “Manual Image Adjust” function on OSD Main Menu.
(b)Then, select and enter “Horizontal Size” or “Horizontal/Vertical Position” function to
adjust the video boundary to be full scanned and within screen frame.
White Balance
Test Signal: 640*480@60Hz
Test Pattern: White and Black Pattern
1.5.8 R, G, B, Colors Contrast
Test Signal: 1280*1024@60Hz
Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern
- Check and see if each color is normal and distinguishable.
- If not, please return the unit to repair area.
Screen Uniformity and Flicker
Test Signal: 1280*1024@60Hz
Test Pattern: Full White Pattern
- Check and see if it is in normal condition.
1.5.10 Dead Pixel and Line
Test Signal: 1280*1024@60Hz
Test Pattern: Dark and White Screen Pattern
- Check and see if there are dead pixels on LCD panel with shadow gauge and filter
film.
- The total numbers and distance of dead pixels should be compliant with the spec.
Mura
Test Pattern: White, RGB, Black, & Grey
Test Tool: 10% ND Filter
- Check if the Mura can pass 10% ND Filter.
Audio
Test Signal: Voice signal (optional, depend on model)
Test Pattern: liberty
- Make sure there is audio output.
- Make sure that audio function (volume 80%) is working without noise and
resonance.
- Make sure that the sound of right and left speakers are in balance.
ViewSonic Corporation Confidential – Do Not Copy VX712
- Normally when the primary mode 1280*1024@60Hz is well adjusted and
compliant with the specification, the secondary display modes will also be compliant
with the spec. But we still have to check with the general test pattern to make sure
every secondary is compliant with the specification.
-
All Modes Reset
After final QC step, we have to erase all saved changes again and restore the factory
defaults. You should do “All Mode Reset” again.
Power Off Monitor
Turn off the monitor by pressing “Power” button.
5.6 Firmware Upgrade Procedure
When you receive the returned monitor, please check whether the firmware version is the
latest. If not, please do the following procedures to upgrade it to the latest version.
1 Equipment Needed
- VX712 Monitor
- Fixture for Firmware Upgrade
- VGA Cable (P/N: 42.59901.003) *1(Pin 4, 11 should be connected to GND)
- PC (Personal Computer)
- LPT Cable (P/N: 42.59906.001) *1
- Firmware Upgrade Program
- One additional monitor for checking the program execution
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2 Setup Procedure
2.1 Connect P2 of Fixture with printer port of PC by LPT Cable.
2.2 Connect P1 of Fixture with VX712 Monitor by VGA Cable.
2.3 Connect Power Cord to VX712 Monitor.
2.4 Connect P3 to the Signal Generator (eg.Chroma2326) for verifying it after the
operation being completed.
2.5 Connect PC to the additional monitor.
P3: to Signal Generator
P1: to VGA Cable
P2: to LPT Cable
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3 Firmware Upgrade Procedure
Step 1. Install the Myson ISP program.
3.1.1 User could download ISP install file from Myson Century
website( //www.myson.com.tw )
3.1.2 After extracting the zip file, the total files list as Fig 3.1, and double click the file of
setup.exe to install.
Fig 3.1.2
3.1.3 Press “Next” button to continue, see Fig 3.1.3.
Fig 3.1.3
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3.1.4 Keep default setting or press “Change” button for selecting the path that you want,
and then press “Next” button to continue, see Fig 3.1.4.
Fig 3.1.4
3.1.5 Press “Install” button to continue, see Fig 3.1.5
Fig 3.1.5
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3.1.6 The Installer Information shows package warning, press “Ignore” button to continue,
see Fig 3.1.6.
Fig 3.1.6
3.1.7 Installation has finished, press “Finish” button, see Fig 3.1.7.
Fig 3.1.7
Step 2. ISP security code setting.
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3.2.1 After installation, we could find the shortcut in the setting path or the program bar
(default setting),see Fig 3.2.1.
Fig 3.2.1.
3.2.2 Press “Create Security File” button to key in security code. Adjusting bar to
decrease speed of IIC bus, see Fig 3.2.2.
Fig 3.2.2.
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3.2.3 Fig 3.2.3 shows the setting for security code of hardware ISP, it needs 4 Command
No, and key in command sequentially for 94, 94, AC, CA, 53.
Fig 3.2.3
Step 3. Let VX712 set to be connected with AC cable and VGA cable.
Step 4. Use ISP to program MCU.
4.3.1 Select MTV type first, load the binary or Intel hex file that you want to program into
the MCU, and select “Auto” item, then press “RUN” button, see Fig 4.3.1.
4.3.2 If user changes the MTV type, it must load file again, or the buffer of load file will be
cleared.
4.3.3 CRC (cyclic redundancy check): the host can check CRC register’s result instead of
reading every byte in flash. The message of “Check MCU CRC OK” means that the Host
verify ok for the progress of program.
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“Check MCU CRC OK”
Fig 4.3.1
Step 5. Unplug and replug power cord of VX712 set and then check the OSD operation
and image on srceen.
Step 6. At last, do “Memory Recall.”
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3.2 Setup Procedure
3.2.1 Connect P2 and P4 of Fixture with VGA ports of VX712 by VGA Cable.
3.2.2 Connect P3 of Fixture with DVI port of VX712 by DVI-DVI Cable.
3.2.3 Connect P1 of Fixture with Printer port of PC by LPT Cable.
3.2.4 Plug Power Adapter to Fixture.
3.2.5 Connect Power Cord to VX712 Monitor.
3.2.6 Connect PC to the additional monitor.
P3:DVI-DVI Cable
P1:to LTP Cable
JP1: Power Adapter
P2: VGA Cable
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3.3 DDC Key In Procedure
Sep1.Select and execute DDc Key In program
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Sep2:Inpute the S/N and execute “Enter”
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Sep3:Key the “Enter” and write the data
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Sep4:If ddc program OK and show “data compare ok”
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Disassemble Process
1. Tools
Glove
Cross screwdriver
Prize equipment or abandoned IC card
Bolt box
Cushion
2. Disassemble process
1、 Tide up the worktable, spread straight cushion, put the monitor on it, the front side
adown.(Picture 1)
2、 Remove the decorate slice of the back cover.(Picture 2)
3、 Remove the decorate slice of the stand.(Picture 3)
4、 Disassemble the 4 screws that fix the stand, remove the stand.(Picture 4)
5、 Disassemble the 4 screws of the back cover.(Picture 5)
6、 Use equipment or abandoned IC card to prize up the bezel through the bottom flute,
as showed in the following the picture 6, and rip up the bezel downwards.(Attention to
the fixed hook position between bezel and back cover, as showed in the following the
picture 7,8,9,10,11,12)
7、 Disassemble the 2 fixed screws and the 2 pins of the KEY board, and remove the
back cover, as showed in the following the picture 13,14,15.
8、 Disassemble the fixed screws in the shield, remove the shield as the direction
arrowhead showed, refer to the following picture 16.
9、 Disassemble the 6 screws and 4 pins of the PWPC board, remove the PWPC
board.(symbolized the following picture 17 with red color)
10、 Disassemble the 3 screws and 4 pins of the main board, remove the main board.
(symbolized the following picture 17 with blue color)
11、 Disassemble the 2 screws of the audio board, remove the audio board. (symbolized
the following picture 17 with yellow color)
12、 Disassemble the 4 fixed screws of the panel, remove the main frame, as showed in
the following the picture 19,20,21. Do not damage the cable of the panel.
13、 That’s all. The disassemble process of the unit is over.
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3. Show pictures:
(Picture 1) (Picture 2)
(Picture 3) (Picture 4)
(Picture 5) (Picture 6)
(Picture 7)
(Picture 8)
(Picture 9)
(Picture 10)
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(Picture 11) (Picture 12)
(Picture 13)
(Picture 14)
(Picture 15) (Picture 16)
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(Picture 17)
(Picture 19)
(Picture 18) (Picture 20)
(Picture 21)
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6. Troubleshooting Flow Chart
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7. Recommend Spare Part List
Serial No. Prefix: Q4P
Accessories:
53
BUCKET-R-COVER
PL-00005000
34G1327 KS B
1
All revised RSPLs with newly added items or any change made should be highlighted and correlated with the ECN/ECR
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Model
MCU
Title
DateRev:
Page 72
10.4 Inverter
+12V
NO/OFF
DIM
R201
15K
C201
+
150U/25V
1U/25V
C203
R202
5.1K
C207
4.7U/16V
0.1U/25V
C208
330P/50V
R204
10K
0.1U/25V
0.1U/25V
R207
OPEN
R205
47K
C205
U201
R203
5.1K
C206
C202
TL1451ACDR
R206
47K
R208
4.7K
C209
1U/25V
2IN-
SCP
REF
2IN+
2FBK
CTRT1IN+
1IN-
1FBK
1234567
C210
1U/25V
R209
4.7K
R211
12K
Q201
DTC144WKA
R210
12K
10111213141516
2OUT
2DTC
1DTC
1OUT
GND Vcc
89
Q202
DTA144WKA
C204
0.1U/25V
C223
+
150U/25V
8
7
6
5
SMAL240 OR SR24
Q207
L201150UH
D201
D203
11B
R22015K
R22212K
23
Q209
2SC5706
Q210
2SC5706
R224
2K
R226
R225
2K
2K
C213
0.15U/250V
1
1
R212
3.9K
R214
3.9K
Q203SI4431 OR AO4403
1
2
3
4
R216
220
C211
1U/25V
Q205
SST3904
SST3906
R218470
23
R240
C221
D204
11B
R22115K
R22312K
0.47U/25V
Q204SI4431 OR AO4403
1
2
3
4
R213
R217
3.9K
220
C212
1U/25V
Q206
SST3904
R215
3.9KCON204
R219
SST3906
470
8
7
6
5
SMAL240 OR SR24
Q208
L202150UH
D202
23
Q211
2SC5706
Q212
2SC5706
R228
2K
51K
R238
R230
R229
2K
2K
C214
0.15U/250V
1
1
23
R241
is power GND
C222
0.47U/25V
51K
R239
12K
R227
2K
12K
R231
2K
D208
RLS4148
59
3,4
2
6
80LL17T-9-LS
D207
RLS4148
59
3,4
2
6
80LL17T-9-LS
R235
910
1U/25V
TP1
R234
910
TP2
C220
TP3
PT201
PT202
1
C219
1U/25V
1
HVO
1
HVL
TP4
HVL
71
HVO
TP6
HVL
71
R237560
22P/3KV
22P/3KV
R232
1K
1N4148
D209
1N4148
R236
22P/3KV
22P/3KV
R233
1K
D206
1N4148
D210
1N4148
C215
C216
1
D205
560
C217
C218
L203
73L174-30-YS
14
23
C224
1000p/50v
TP5
HVL
1
L204
1
14
C225
1000p/50v
73L-174-30-YS
23
CON201
1
2
SM02B-BHSS-1-TB
CON202
1
2
SM02B-BHSS-1-TB
CON203
1
2
SM02B-BHSS-1-TB
1
2
SM02B-BHSS-1-TB
is signal GND
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ViewSonic Corporation
Model
Inverter
Title
DateRev:
Page 73
10.5 A-D Power
C0N102
GND
12
GND
11
5V
10
5V
9
GND
8
GND
7
12V
6
12V
5
DIM
4
GND
3
ON/OFF
2
GND
1
33A8009-12G-H
4
-+
2
23
14
C903 0.47uF/250V
R902
1M 1/4W
C902
0.001uF/250V
3
12
CN901
2KBP06M
L902
1
R901
1M 1/4W
C901
0.001uF/250V
DB901
3
73L-174-26-T
NR901
NTCR
t
F901
FUSE
5V
12V
DIM
ON/OFF
GND
C904
+
120uF/400V
R909
4.7K 1/4W
ZD901
MTEJ20B
R912
100 1/4W
T901
1
D901
UF4007
FB901
BEAD
R908
5.1 1/4W
O
3
5
O
4
C912
0.0047uF/250V
43
IC903
HTL431
R906
1M 1/4W
R907
1M 1/4W
C907
0.1uF
IC901
SG6841
4
R913
10K 1/4W
SG6841
56
13
Q901
2PA733P
C909
0.1uF
R914
24K 1/4W
R904
1M 1/4W
R905
1M 1/4W
72
10 1/4W
8
C911
N.C 1/6W
C910
0.001uF
C908
0.1uF
R911
4.7K 1/4W
C905
0.0015uF/2KV
+
C906
22uF
R915
R916
10K 1/4W
R910
4.7K 1/4W
Q902
2PC945P
D902
PS102R
R903
100K 2W
Q903
FQPF7N80
R917
0.39 2W
D903
1N4148
9
O
7,8
7,8
10,11
12
PC123FY82 4P
IC902
R920
47 1/2W
R921
47 1/2W
10A/100V
C929
0.1uF
D910
20A/100V
D911
C920
0.001uF/500V
C921
0.001uF/500V
R929
100 1/4W
ZD902
HZ12B2
R928
1K 1/4W
R927
0 1/4W
C928
0.01uF
C922
+
1000uF/16V
+
C923
1000uF/16V
R925
1K 1/4W
R926
1K 1/4W
ZD903
HZ5C1
C927
0.1uF
12V
5V
L903
+
C924
470uF/16V
L904
+
C925
470uF/16V
R922
33K 1/4W
R924
2.4K 1/4W
R923
3.6K 1/4W
ZD904
SML4736
C926
0.1uF
ViewSonic Corporation
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Model
A-D Power
Title
DateRev:
Page 74
PHONEJACK
PHONEJACK
CN201
CN201
NC
NC
CN204
CN204
10.6 Audio
DateRev:
Title
100pF
100pF
C211
C211
20K 1/16W
20K 1/16W
20K 1/16W
20K 1/16W
C212
100pF
C212
100pF
+
C209
1.0uF+C209
1.0uF
GNDGND
+
C210
1.0uF+C210
1.0uF
C213
0.1uF
C213
0.1uF
1
GND
2
GND
3
GND
GND
GND
Model
ViewSonic Corporation
13
GND
18
GND
19
GND
20
GND
C208
C208
470uF/16V
470uF/16V
+
+
Audio
GND
R210
R210
R211
R211
12
MUTE
VAROUT_L
5
R207
R207
1K
1K
R208
R208
1K
1K
2
R203 18K 1/16W
R203 18K 1/16W
200
200
R212
R212
11
6
VOLUME
STBY
VAROUT_R
SVR
10
7
470uF/16V
470uF/16V
C207
C207
3
R201
R201
18K 1/16W
18K 1/16W
C206 0.47uF/25VC206 0.47uF/25V
4
9
INL
INR
OUTR
OUTL
14
17
470uF/16V
470uF/16V
+
+
145
GND
VOLUME
C204 0.47uF/25VC204 0.47uF/25V
STANDBY
8
NC
16
VS
15
VS
TDA7496L
TDA7496L
GND
C205
C205
+
+
GND
U201
U201
123
11
+
+
C201
C201
+
+
C202
C202
C203
C203
13
13579
2468101214
680uF/25V
680uF/25V
680uF/25V
680uF/25V
0.1uF
0.1uF
pin header2*7 2mm female
pin header2*7 2mm female
CN202
CN202
12V
MUTE
+12V
OUT_L
OUT_R
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11. PCB Layout Diagrams
11.1 MAIN BOARD PCB TOP VIEW
11.2 MAIN BOARD PCB BUTTON VIEW
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11.4 KEYBOARD BUTTON VIEW
11.3 KEYBOARD TOP VIEW
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11.5 POWER PCB TOP VIEW
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11.6 POWER PCB BUTTON VIEW
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.7 AUDIO PCB BUTTON VIEW
11
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Page 80
* Reader’s Response*
Dear Readers:
Thank you in advance for your feedback on our Service Manual, which allows continuous improvement
of our products. We would appreciate your completion of the Assessment Matrix below, for return to
ViewSonic Corporation.
Assessment
A. What do you think about the content of this Service Manual?
Unit Excellent
1. Precautions and Safety Notices
2. Specification
3. Front Panel Function Control Description
4. Circuit Description
5. Adjustment Procedure
6. Troubleshooting Flow Chart
7. Recommended Spare Parts List
8. Exploded Diagram and Exploded Parts List
9. Block Diagrams
10. Schematic Diagrams
11.PCB Layout Diagrams
B. Are you satisfied with this Service Manual?
Good Fair Bad
Item Excellent Good Fair Bad
1. Service Manual Content
2. Service Manual Layout
3. The form and listing
C. Do you have any other opinions or suggestions regarding this service manual?
Reader’s basic dada:
Name:
Title:
Company:
Add:
Tel:
Fax:
E-mail:
After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile
1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes
(marc.maupin@viewsonic.com)
ViewSonic Corporation Confidential – Do Not Copy VX712
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