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Envision EN7400e
SERVICE MANUAL
17" LCD Monitor
EN7400e
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS
BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF
THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR CHANGES,
ERRORS OR OMISSIONS.
MANUFACTURE DATE: Jul-22-2005
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Envision EN7400e
REVISION DATE MODIFIACTION
A00 Jul-22-2005 Initial release
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TABLE OF CONTENTS
Revision List ---------------------------------------------------------------------------------- 02
Table of Contents ---------------------------------------------------------------------------------------- 03
1. Monitor Specifications --------------------------------------------------------------------------------04
2.LCD Monitor Description -----------------------------------------------------------------------05
3.Operation Instructions --------------------------------------------------------------------------06
3.1 General Instructions -----------------------------------------------------------------------06
3.2 Control Button ------------------------------------------------------------------------------06
3.3 Adjusting The Picture ---------------------------------------------------------------------07 08
4 . I n p u t / O u t p u t Sp e c i f i c a t i o n ------------------------------------------------------------------- 08
4.1 Input Signal Connector -------------------------------------------------------------------09
4.2 Factory Preset Display Modes ----------------------------------------------------------10
4.3 Power Supply Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11
5 . P a n e l Sp e c i f i c a t i o n - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 2
5.1 General Feature ----------------------------------------------------------------------------12
5.2 Optical Characteristics --------------------------------------------------------------------13
6. Block Diagram -----------------------------------------------------------------------------------13
6.1 Monitor Exploded View ------------------------------------------------------------------13
6.2 Software Flow C hart -----------------------------------------------------------------------15 16
6.3 Electrical Block Diagram -----------------------------------------------------------------17 19
7. Schematic -----------------------------------------------------------------------------------------20
7.1 Scalar Board ---------------------------------------------------------------------------------20 23
7.2 Power Board -------------------------------------------------------------------------24 25
8. PCB Layout ---------------------------------------------------------------------------------------26
8.1 Main Board ----------------------------------------------------------------------------------26
8.2 Power Board --------------------------------------------------------------------------------27
8.3 KEY Board ------------------------------------------------------------------------------ 27
9 . M a i n ta i n a b i l i t y -----------------------------------------------------------------------------------28
9 . 1 E q u i p m e n t s a n d To o l s R e q u i r e m e n t s -------------------------------------------------28
9.2 Trouble Shooting ---------------------------------------------------------------------------29 34
10. White-Balance, Luminance Adjustment ----------------------------------------------- 35
11. Check List after replacing LCD Main board----------------------------------------------- 36 38
12. EDID Content ---------------------------------------------------------------39
13. BOM List ----------------------------------------------------------------------------------40 55
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Envision EN7400e
1. MONITOR SPECIFICATIONS
Driving system TFT LCD
Size 43cm(17")
Type QD17EL07 (QDI)
Pixel pitch 0.264mm(H) x 0.264mm(V)
Viewing angle 160(H) 145(V) (R>5)
LCD Panel
Luminance 270cd/
Contrast Ratio 450:1
Response time 16ms (typ)
Display colors 16.2 million Colors
R G B Analog 0.7Vp-p
H/V separate TTL level
H/V composite TTL level
Input signals
Horizontal frequency 30kHz80kHz
Vertical rate 55-75Hz
Recommend resolution 1280 x 1024@60HZ
ON MODEL 45W
Stand by 3W
Power consumption
Suspend 3W
OFF MODEL 3W
Power supply AC voltage 100~240VAC,47~63Hz
Maximum Screen Size Horizontal: 337.9mm Vertical: 270.3mm
Operating condition Temperature 5-35°C
Storage Condition Temperature -20-60°C
Dimension Unpackaged 407 mm (W) x 434mm (H) x 173mm (D)
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Envision EN7400e
2. LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a main board, a power board and a keypad board which house the flat panel
control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Monitor Block Diagram
Flat Panel and
CCFT Drive.
CCFL backlight
PWPC board Main Board
RS232 Connector
(Include: adapter, inverter)
For white balance
adjustment in
factory mode
Keyboard
AC-IN
HOST Computer Video signal, DDC
100V-240V
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Envision EN7400e
3. OPERATING INSTRUCTIONS
3.1 GENERAL INSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor. By changing these settings, the picture can be adjusted to your personal preferences.
· The power cord should be connected.
· Connect the video cable from the monitor to the video card.
· Press the power button to turn on the monitor position. The power indicator will light up.
3.2 FRONT PANEL CONTROL
NO. Name Within OSD Without OSD
1. Exit Sub menu Run the Auto Adjust when this
1 Auto/Exit
2. Exit the menu item button keep to push for 2 second
1.Move the cursor to left
2 Brightness Open the Brightness menu
2.Adjust down when menu item selected
1.Move the cursor to right
3 Contrast Open the contrast menu
2.Adjust up when menu item selected
4 MENU Select Function or select Sub menu Activate OSD main menu
5 Indicator Green--On Red--Save Green--On Red--Save
6 Power Power On / Off Power On / Off
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Envision EN7400e
3.3 ADJUSTING THE PICTURE
THE DESCRIPTION FOR CONTROL FUNCTION:
Main
Main Menu Sub Menu Sub Menu Adjust
Menu Description Reset Value
Item Item Icon Range
Icon
Recall Cool
Contrast Contrast from Digital-register. 0-100
Contrast Value
Luminance
Recall Cool
Brightness Backlight Adjustment 0-100
Brightness Value
Adjust Picture Phase to reduce
Focus 0-100 Do Auto Config
Horizontal-Line noise
Image Setup
Adjust picture Clock to reduce
Clock 0-100 Do Auto Config
Vertical-Line noise.
Adjust the horizontal position of the
H. Position 0-100 Do Auto Config
Image picture.
Position Adjust the vertical position of the
V. Position 0-100 Do Auto Config
picture.
Recall warm Color Temperature
C1 N/A N/A The Color
from EEPROM.
Temperature will
Recall cool Color Temperature from
C2 N/A N/A be set to Cool.
EEPROM.
Color Temp. User / Red Red Gain from Digital-register. 0-100 The User R/G/B
value (default is
User /
Green Gain from Digital-register. 0-100 100) will not be
Green
Modified by Reset
User / Blue Blue Gain from Digital-register. 0-100 function.
Auto Config Auto Adjust the H/V Position, Focus
Yes N/A N/A N/A
(Analog-Only and Clock of picture.
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Model) Do not execute Auto Config, return
No N/A N/A N/A
to main menu.
Adjust the horizontal position of the
H. Position 0-100 50
OSD.
Adjust the vertical position of the
OSD Setup V. Position 0-100 50
OSD.
OSD
Adjust the OSD timeout. 10-120 10
Timeout
Set OSD display language to
English N/A N/A
English.
Set OSD display language to
Deutsch N/A N/A The Language
German.
Language will be set to
Set OSD display language to
Français N/A N/A English.
French.
Español N/A Set OSD display language to Spain. N/A
Italiano N/A Set OSD display language to Italian. N/A
Show the resolution, H/V frequency
Information Information N/A and input port of current input N/A N/A
timing.
Clear each old status of
Yes N/A Auto-configuration and set the color N/A N/A
Reset temperature to Cool.
Do not execute reset, return to main
No N/A N/A N/A
menu.
Exit N/A N/A Exit OSD N/A N/A
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4. INPUT/OUTPUT SPECIFICATION
4.1 INPUT SIGNAL CONNECTOR
ANALOG D-SUB CONNECTOR
PIN NO. DESCRIPTION PI N NO. DESCRIPTION
1. Red 9. +5V
2. Green 10. Logic Ground
3. Blue 11. Monitor Ground
4. Monitor Ground 12. DDC-Serial Data
5. DDC-Return 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA connector layout
1 5
6 10
11 15
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4.2 FACTORY PRESET DISPLAY MODES
VESA MODES
Horizontal Vertical
Nominal Sync Nominal Sync Nominal
Frequency Polarity Freq. Polarity Pixel
Mode Resolution Total
+/- 0.5kHz +/- 1 Hz Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA 640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
SVGA
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
XGA 1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
SXGA
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
IBM MODES
Horizontal Vertical
Nominal
Nominal Nominal
Sync Sync Pixel
2Mode Resolution Total Frequency Freq.
Polarity Polarity Clock
+/- 0.5kHz +/- 1 Hz
(MHz)
DOS* 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
DOS** 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175
DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175
MAC MODES
VGA 640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA 832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832
*, ** - The two complimentary modes feature the same horizontal and vertical sync frequencies and polarities,
and therefore require manual selection.
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4.3 POWER SUPPLY REQUIREMENT
A/C Line voltage range : 100 V ~ 240 V
A/C Line frequency range : 50 ± 3Hz, 60 ± 3Hz
Current : TBD
Peak surge current : < 55A peak at 240 VAC and cold starting
Leakage current : < 3.5mA
: No advance effects (no loss of information or defect)
Power line surge
with a maximum of 1 half-wave missing per second
Voltage : 12VDC ± 5
CURRENT : 3.5 Amp (max)
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Envision EN7400e
5. PANEL SPECIFICATION
5.1 GENERAL FEATURE
This module is a color active matrix LCD module incorporating amorphous silicon TFT (Thin Film Transistor). It
is composed of a color TFT-LCD panel; driver ICs, control circuit and power supply circuit and backlight unit.
Graphics and texts can be displayed on a 1280 3 1024 dots panel with 16.2 million colors by using the LVDS
(Low Voltage Differential Signaling) interface, 6-bit-2bit FRC driving method and supplying +5V DC supply voltage
for TFT-LCD panel driving.
The TFT-LCD panel used for this module has very high aperture ratio. A low-reflection and
higher-color-saturation type color filter is also used for this panel. Therefore, high-brightness and high-contrast
image, which is suitable for the multimedia use, can be obtained by using this module.
High aperture panel; high-brightness or low power consumption.
Brilliant and high contrast image.
Small footprint and thin shape.
SXGA resolution.
LVDS interface
Low power consumption.
Wide viewing angle.
Display Characteristics
Parameter Specification Unit
Display size 43(17") Diagonal Cm
1280(H) 1024(V) mm
Pixel format
(1 pixel=R+G+B dots) Pixel
Active area 337.9(H) 270.3(V)
Pixel pitch 0.264(H) 0.264(V) mm
Pixel configuration R,G,B vertical stripe
Display mode Normally White
Unit outline dimensions(typ.)*1 358.5 296.5 16.5 mm
Weight 1970(Max.) g
Anti-glare and hard-coating 3H
Surface treatment
Low reflection ( 5%)
Lamp Quantity 4 pcs
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5.2 OPTICAL SPECIFICATION
Ta=25 VDD=+5V
ELECTRICAL SPECIFICATIONS
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Envision EN7400e
6. BLOCK DIAGRAM
6.1 MONITOR EXPLORED
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6.2 SOFTWARE FLOWING CHART
1
Y
2 3
N
4
N
5
Y
6
N
7 8
Y
9
N
10 11
Y
N N
12 13
Y Y
N
14 15 16
Y
17
N
18 19
Y
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Envision EN7400e
REMARK:
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they're any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
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Envision EN7400e
6.3 ELECTRIAL BLOCK DIAGRAM
6.3.1 MAIN BOARD
LCD Interface
(CN301)
Flash Memory
A290011T-70
Scalar gm2120 CG
(U202)
(Include MCU,ADC,OSD)
(U203)
H sync
V sync
RXD RGB
EPR_SDA TXD
EPR_SCL
OSD Control
D-Sub
Interface EEPROM
Connector
(CN403) 24C16
(CN102)
(U102)
DB15_SDA,
DB15_SCL
EEPROM
24C02
(U104)
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6.3.2 INVERTER/POWER BOARD
Inverter Block
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Power Block Diagram
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7. SCHEMATIC
7.1 MAIN BOARD
715L 972-1-6
CN101
26 1 RX2-IN
A_GND T2- RX2- P.3
2 RX2+IN
T2+ RX2+ P.3
3
2
2
SGND 4 Connect two grounds at one single point only.
T4- 5 ED101 ED102
T4+ 6 SCL_IN C114 C115
DDCCLK SCL_IN
7 SDA_IN 0.1uF/16V(NC) 0.1uF/16V(NC)
DDCDAT SDA_IN
8
A_VSYNC
D-SUB GND GND
9 RX1-IN AGND GND
1
1
T1- RX1- P.3
10 RX1+IN
T1+ RX1+ P.3
11
2
2
SGND 12 DVI_5V ZD101
R101
T3- 13 MLL5232B 5.6V ED103 ED104
T3+ 10K 1/16W
14 C116 C117
+5V 15 0.1uF/16V(NC) 0.1uF/16V(NC)
GND 16 HOT_PLUG
HPD
GND GND GND
17 RX0-IN
1
1
T0- RX0- P.3
18 RX0+IN
T0+ RX0+ P.3
19
2
2
SGND 20
T5- 21 ED105 ED106
T5+ 22 C118 C119
SGND 23 RXC+IN 0.1uF/16V(NC) 0.1uF/16V(NC)
TC+ 24 RXC-IN
TC-
GND GND
C1
1
1
A_RED C2 P.3
A_GREEN RXC+
C3
A_BLUE C4
DIGITAL USE RXC-
P.3
2
2
A_HSYNC C5
25 A_GND ED107 ED108
A_GND C120 C121
0.1uF/16V(NC) 0.1uF/16V(NC)
JACK
GND GND
1
1
GND
DVI_5V +5V
D101
BAT54C-GS08
DVI_5V
C101
R147 100 1/16W P.3
NC R143 GPIO4/UART_DI UART_DI
0.1uF/16V DDC_SCL_D R116 P.3 R148 100 1/16W P.3
DDC_SCL DVI_PLUG UART_DO
GPIO5/UART_DO
DDC_SDA_D 100 1/16W
R117 NC
10K 1/16W
10K 1/16W
DDC_SDA
R109
GND R151
R110
10K 1/16W ZD106 ZD107
MLL5232B 5.6V MLL5232B 5.6V
U102
1 8 GND
2 A0 VCC 7 GND GND
3 A1 WP 6 R111 100 1/16W DDC_SCL_D
A2 SCL DDC_SDA_D SCL_IN
4 5 R112 100 1/16W
MLL5232B 5.6V
GND SDA SDA_IN +5V
M24C02WMN6
ZD102
GND R159 0 1/16W R142
ZD103 VGA_D1 10K 1/16W R144
MLL5232B 5.6V 4.7K 1/16W
VGA_CONN VGA_PLUG
VGA_PG
+5V
VGA_D2
ZD110
GND R161 0 1/16W MLL5232B 5.6V
R158 R160
GND 0 1/16W 0 1/16W
C102 AGND
0.1uF/16V
AGND
(10 mil, ) 12/10
D103 D104 D105 AGND
VGA_5V +5V BAV99 BAV99 BAV99
C122 NC
AGND