Envision EN9110 Service Manual
0
SERVICE MANUAL
E
E
N
N99111100
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 DATA: Jul-29-04
1
TABLE OF CONTENTS
PAGE
1. SPECIFICATIONS FOR LCD MONITOR 3
1-1 GENERAL PECIFICATIONS 3
1-2 LCD MONITOR DESCRIPTION 4
1-3 PANEL SPECIFICATION (AU EN02)
1-3-1 PANEL FEATURE
1-3-2 DISPLAY CHARACTERISTICS
1-3-3 OPTICAL CHARACTERISTICS
1-3-4 PARAMETER GUIDE LINE FOR CCFL INVERTER
1-4 FACTORY PRESET TIMING LIST
1-5 INTERFACE CONNECTOR
5
5
5
6
6
7
8
2. PRECAUTION AND NOTICES 9
2-1 ASSEMBLY PRECAUTION 9
2-2 OPERATIONG PRECAUTION 9
2-3 STORAGE PRECAUTION 9
2-4 HIGH VOLTAGE WARNING 9
3. OPERATING INSTRUCTIONS 10
4. ADJUSTMENT 12
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS 12
4-2 ADJUSTMENTS METHOD. & DESCRIPTION
4-2-1 WHITE BALANCE, LUMINANCE ADJUSTMENT
4-2-2 OSD ADJUSTMENT
12
12
13
5. BLOCK DIAGRAM 15
5-1 SPECIAL FUNCTION WITH PRESS KEY 15
5-2 CIRCUIT FUNCTION DESCRIPTION 15
5-2-1 MAIN BOARD
5-2-2 INVERTER/POWER BOARD
5-3 SOFTWARE FLOW CHART
15
16
16
6. MAINTAINABILITY
6-1 EQUITMENT AND TOOLS REQUIRED
6-2 TROUBLE SHOOTING
6-2-1 INTERFACE-BOARD TROUBLE-SHOOTING CHART
18
18
18
18
6-2-2 INVERTER –MODULE TROUBLE SHOOTING CHART 23
6-2-3 KEYBOARD-MODULE TUOUBLE SHOOTING CHART 25
7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY 27
8. POWER SYSTEM AND CONSUMPTION CURRENT 28
9. SCHEMATICS 29
9-1 MAINBOARD SCHEMATIC DIAGRAM 29
9-2 Adapter Board SCHEMATICS 37
9-3 Inverter Board SCHEMATICS 38
10. PCB LAYOUT 39
11. EDID CONTENT 40
12.BOM LIST 41
2
1. SPECIFICATIONS FOR LCD MONITOR
1-1 GENARAL SPECIFICATION
1. LCD-Panel:
Active display area 19 inch diagonal
Pixel pitch 0.294 mm x 0.294 mm
Pixel format 1280 x 1024 RGB vertical stripe arrangement
2. Display Color:
8-bit, 16.7 million colors
3. External Controls:
Auto Config/Exit, Brightness (up key), contrast (down key), Menu/Enter, Power
indicator, Power button
4. Input Video Signal:
Analog-signal 0.7Vpp
Video signal termination impedance 75 OHM
Digital-input TMDS
5. Scanning Frequencies:
Horizontal: 30 KHz - 92 KHz
Vertical: 55 Hz – 85 Hz
Pixel clock: 158 MHz
6. Factory Preset Timing: 26
Input signal tolerance: H tolerance ± 1 KHz, V tolerance ±3lines from center
frequency
7. Input Power Source:
Switching Mode Power Supply
AC 100 – 240 V, 50/60 Hz Universal Type
8. Operating Temperature: 0°C - 40°C Ambient
Non-operating Temperature: -20°C - 60°C
9. Humidity:
Operating: 15% to 90% RH
Non Operating: 15% to 90%RH
10. Weight: 5.9 kg for monitor only, 8,7kg with packing.
11. External Connection: 15Pin D-type Connector &24 pin DVI-D, AC power-
Cord
12. View Angle: Min.70 H and V
13. Outside dimension: Width x Height x Thickness = 432x 440 x 198 mm
14. Plug and Play: VESA DDC1/DDC2B
15. Power saving: Compatible VESA DPMS
16. Audio performance (optional): Each speaker shall accept up to 3.0 watt of audio
power without damage or exceeding the frequency response and total harmonic
distortion specification and audio amplifier shall provide two channels of audio up to
2.0 watts per channel from 100Hz to 20kHz.
17. USB hub (optional): 1 up-stream and 4 down-streams
3
1-2 LCD MONITOR DESCRIPTION
The LCD monitor contains main-board, Inverter module, keyboard, audio module,
USB-hub module and External Adapter.
The main-board controls all logic signals such as panel control logic, backlight
control logic, …etc.
The Inverter module will drive the backlight of panel.
The Adapter supplies power to the LCD monitor.
DVI input
Gm5020 (U600)
LVDS chip
Panel-Power Control
(U203)
MCU (U502)
Data Digital RGB
Panel Control Signal:
Phs, Pvs, PclkA/B,
Pdis
p
e
Panel Power 5V
Communication signal:
Hclk, Hfs, Hdata0
Analog RGB
Osc
illator 24
Crystal 24 MHz
DDC-chip
PANEL
Main-board Block diagram
INVERTER
module
-
DC 12V 5Amp
-
Frame store
Audio module
(optional)
USB hub module
(optional)
4
1-3 PANEL SPECIFICATION (AU EN02)
1-3-1 Panel Feature
－ 19 inch Color TFT-LCD
－ ALL input signals are 2 Channel LVDS interface compatible
－ Supported the SXGA(H1280Pixel × V1024Lines) resolution
－ By applying 16.7M colors (RGB 8 bit data)
1-3-2 Display Characteristics
ITEM UNIT SPECIFICATIONS
Screen Diagonal [mm] 480(19”)
Active Area [mm] 376.32(H) x 301.056(V)
Pixel Pitch 1280(x3) x 1024
Pixel Arrangement [mm] 0.294(per one triad) x 0.294
Display Mode R.G.B Vertical Stripe
White Luminance (Center) [cd/m²] 250 cd/m²@7mA (Typ)
Contrast Ratio 600:1(Typ)
Optical Response Time [msec] 25(Typ)
Nominal input Voltage VDD [Volt] +5.0V
Power consumption
(VDD line + CCFL line)
[Watt]
28W (Typ.) (w/o Inverter, All white pattern)
Weight [Grams] 2700(Typ)
Physical Size [mm] 404.2(W) x330 (H) x20 (D)(Typ)
Electrical Interface Even/Odd R/G/B data, 3 sync signal Clock
Support Color 16.7M colors (RGB 8-bit data)
Temperature Range
Operating
Storage (Shopping)
[℃]
[℃]
0 to +50
-20 to +60
5
1-3-3 Optical Characteristics
The optical characteristics are measured under stable conditions at 25℃ (Room
Temperature):
ITEM UNIT CONDITIONS MIN TYP. MAX.
[degree]
[degree]
Horizontal (Right)
CR=10(Left)
75
85
85
–
–
[degree]
Viewing Angle
[degree]
Vertical (Up)
CR=10(Down)
75
85
85
–
–
Contrast ratio Normal Direction 400 600
[m sec] Raising Time – 15 25
[m sec] Falling Time – 10 15
Response Time (Note 1)
[m sec] Raising +Falling – 25 40
Red x 0.604 0.634 0.664
Red y 0.324 0.354 0.384
Green x 0.278 0.308 0.338
Green y 0.576 0.606 0.636
Blue x 0.108 0.138 0.168
Blue y 0.057 0.087 0.117
White x 0.28 0.31 0.34
White y 0.3 0.33 0.36
Color Coordinates (CIE) White
White Luminance at CCFL
7.0mA
(central point)
[cd/㎡]
200 250 –
Luminance Uniformity (Note 2) [%] 75 80 –
Crosstalk (in 75Hz)(Note 3) [%] 1.5
1-3-4 Parameter guide line for CCFL Inverter
INVERTER MAX BRINGTHNESS (Vadj: 3.0v), LOAD=100KΩX4(ROOM
TEMPERATURE 25℃ ±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage Vin 10.8 12 13.2 V
Input current Iin --- 1950 2200 mA FOR 4 LOAD
Output Current Iout 6.0 7.0 8.0 mA FOR 1 LOAD
Frequency
F 45.0 50.0 55.0 KHZ
FOR 1 LOAD
H.V open Vopen 1550 1700 1850 Vrms NO LOAD
H.V Load Vload 620 670 720 Vrms RL=100KΩ
Start voltage Vst
1870 1970 2070 Vrms RL=CCFL
Protect delay time PDT
1 1.5 3 Sec
6
INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=100KΩX4(ROOM
TEMPERATURE 25℃ ±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
input voltage Vin 10.8 12 13.2 V
input current Iin 470 520 mA FOR 4 LOAD
Output Current Iout 2.5 3.0 3.5 mA FOR 1 LOAD
Frequency
F 45.0 50.0 55.0 KHZ
FOR 1 LOAD
H.V open Vopen 1550 1700 1850 Vrms NO LOAD
Start voltage Vst
1650 1970 2050 Vrms RL=CCFL
H.V Load Vload 270 320 370 Vrms RL=100KΩ
1-4 FACTORY PRESET TIMING LIST
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequenc
y
+/-
0.5kHz
Sync
Polarit
y
Nomina
l
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N/P 59.940 N/P 25.175
640x480@72Hz 832 x 520 37.861 N/P 72.809 N/P 31.500
640x480@75Hz 840 x 500 37.500 N/P 75.00 N/P 31.500
VGA
640x480@85Hz 832 x 509 43.269 N/P 85.008 N/P 36.000
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 N/P 60.317 N/P 40.000
800x600@72Hz 1040 x 666 48.077 N/P 72.188 N/P 50.000
800x600@75Hz 1056x 625 46.875 N/P 75.000 N/P 49.500
SVGA
800x600@85Hz 1048x631 53.674 N/P 85.061 N/P 56.250
1024x768@60Hz 1344x806 48.363 N/P 60.004 N/P 65.000
1024x768@70Hz 1328x806 56.476 N/P 70.069 N/P 75.000
1024x768@75Hz 1312x800 60.023 N/P 75.029 N/P 78.750
XGA
1024x768@85Hz 1376x808 68.677 N/P 84.997 N/P 94.500
1280x1024@60Hz 1688x1066 63.981 N/P 60.020 N/P 108.000
1280x1024@75Hz 1688x1066 79.976 N/P 75.025 N/P 135.000
SXGA
1280x1024@85Hz 1728x1072 91.146 N/P 85.024 N/P 157.500
1152x 864@75Hz 1600x900 67.500 N/P 75.000 N/P 108.000
1280x960@60Hz 1800x1000 60.000 N/P 60.000 N/P 108.000
1280x960@85Hz 1728x1011 85.938 N/P 85.002 N/P 148.500
Notice: For digital input, the resolution 1280x1024@ 85hz, 1280x960@ 85Hz are not
supported.
7
IBM MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polari
ty
Nominal
Freq.
+/- 1 Hz
Sync
Polarit
y
Nominal
Pixel
Clock
(MHz)
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
720x400@85Hz 936 x 446 37.927 N 85.039 P 35.550
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/P 66.667 N/P 30.240
SVGA
832x624@75Hz 1152x667 49.725 N/P 74.551 N/P 57.283
All modes will automatically optimize the screen size with “ AUTO-config “ function, except
3 dos- modes: 640x480@60hz, 720 x 400@70hz, 640x350@70hz.
1-5 INTERFACE CONNECTION
(A) AC-Power Cable
(B) Video Signal Connectors and Cable
(C) DVI-D and DVI cable
(D) Audio cable (optional)
(E) USB cable (optional)
(F) External Adapter
8
2. PRECAUTIONS AND NOTICES
2-1 ASSEMBLY PRECAUTION
(1) Please do not press or scratch LCD panel surface with anything hard. And do not
soil LCD panel surface by touching with bare hands (Polarizer film, surface of
LCD panel is easy to be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to
maintain display characteristic and reliability. If this panel is subject to hard
pressing, the following occurs:
(a) Uniform color
(b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of
it being soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface
immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
2-2 OPERATING PRECAUTIONS
(1) Please be sure to unplug the power cord before remove the back-cover. (Be sure
the power is turn-off)
(2) Please consider that LCD backlight takes longer time to become stable of
radiation characteristic in low temperature than in room temperature.
(3) Please pay attention not to displaying the same pattern for very long-time. For
image might stick on LCD.
2-3 STORAGE PRECAUTIONS
(1) When you store LCD for a long time, it is recommended to keep the temperature
between 5℃-40℃ without the exposure of sunlight and to keep the humidity less
than 85% RH.
(2) Please do not leave the LCD in the environment of high humidity and high
temperature such as 60℃ 90%RH.
(3) Please do not leave the LCD in the environment of low temperature; below -15℃.
2-4 HIGH VOLTAGE WARNING
The high voltage is only generated by INVERTER module; carelessly contacting the
transformer on this module can cause a serious shock. (The lamp voltage after
stable around 600V, with lamp current around 6.5mA, and the lamp starting voltage
was around 1650V, at Ta=25℃)
9
3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the LCD monitor
display.
1. Position the display on the desired operation and plug–in the power cord into
External Adapter AC outlet. Three-wire power cord must be shielded and is
provided as a safety precaution as it connects the chassis and cabinet to the
electrical conduct ground. If the AC outlet in your location does not have
provisions for the grounded type plug, the installer should attach the proper
adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system
device and lock both screws on the connector to ensure firm grounding. The
connector information is as follow:
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION
PIN NO.
DESCRIPTION
1. RED 9. 5V power from VGA-card
2. GREEN 10. Detect Cable
3. BLUE 11. SYNC. GND
4. GND 12. DDC-Serial Data
5. GND 13. HORIZ. SYNC
6. GND-R 14. VERT. SYNC
7. GND-G 15. DDC Serial Data
8. GND-B
1
6
11 15
5
10
10
3. Connect the 24-pin color display shielded DVI-DVI signal cable to your signal
system device and lock both screws on the connector to ensure firm grounding.
The connector information is as follow:
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION
PI N NO.
DESCRIPTION
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. Ground (for+5V)
4. TMDS Data 4- 16. Hot Plug Detect
5. TMDS Data 4+ 17. TMDS Data 0-
6. DDC Clock 18. TMDS Data 0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. N.C. 20. TMDS Data 5-
9. TMDS Data 1- 21. TMDS Data 5+
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock +
12. TMDS Data 3- 24. TMDS Clock -
4. Apply power to the display by pressing the power key for about 2 second
consecutively and allow about several seconds for Panel warm-up. The PowerOn indicator lights up when the display is on.
5. With proper signals feed to the display, a pattern or data should appear on the
screen, adjust the brightness and contrast to the most pleasing display, or press
auto-key to get the factory preset best picture-quality.
6. This monitor has power saving function following the VESA DPMS. Be sure to
connect the signal cable to the PC.
7. If your LCD monitor requires service, it must be returned with the power cord &
Adapter.
11
4. ADJUSTMENT
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
Adjustments should be undertaken only on following function: Contras, Brightness,
Black level, Phase, Clock, H/V-position, Languages, Color- (C2, C1, User), Auto level, ,
Languages, Reset, RGB level, input selected, scaling mode
- Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again
to restore normal status.
- Left / Right Button:
The Left/Right Button is used to control the monitor functions. Press to switch
functions or adjust settings.
- Auto Adjust Key:
The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and
Phase.
- Power Indicator:
Green — Power On mode.
orange — Power Saving mode.
Blank —Power Off Mode.
4-2 ADJUSTMENT METHOD AND DESCRIPTION
4-2-1 White-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white
balance adjustment.
Before start adjusting white balance, please set Chroma-7120 MEM. Channel 1 to C2
color and MEM. channel 2 to C1 color, (our C2 parameter is x = 296 ±20, y = 311 ±20,
Y = 220 and C1 parameter is x = 313 ±20, y = 329 ±20, Y = 220)
How to setting MEM. channel you can reference to chroma 7120 user guide or simple
use “ SC” key and “ NEXT” key to modify x,y,Y value and use “ID” key to modify the
TEXT description
Following is the procedure to do white-balance adjustment:
Press MENU button during 1 seconds along with plug in the DC-power cord will
activate the factory mode, and the OSD screen will located at left top of the panel.
Alignment Procedure
1.) Pattern generator Output: Timing 1280x1024@60hz, Pattern 32 Gray Scale, Analog.
2.) Connect Alignment Tool JP2 with Chroma 7120, JP3 with Monitor Analog
Connector, JP4 with Pattern Generator.
3.) Press Menu and Select Button, then Power on Monitor to enter Factor Mode.
4.) Press [SW1] at Alignment Tool.
5.) Change Pattern Generator Pattern to Full White Pattern.
6.) Press [SW2] at Alignment Tool.
7.) Wait LED from OK -> BUSY -> OK.
8.) Press [SW3] once to verify 7800 color temperature.
9.) Press [SW3] once to verify 6500 color temperature.
10.) If there is error at step 7 to 8, repeat step 4 to 9.
4-2-2 OSD adjustments
12
Turn the POWER-button off to on to quit from factory mode (in USER-mode, the
OSD window location was placed at the middle of the screen) Press MENU
button to activate OSD Menu or make a confirmation on desired function, Press
Left/Right button to select the function or done the adjustment.
1. Clock adjustment
Set the Chroma at pattern 63 (cross-talk pattern) or WIN98/95 shutdown mode
(dot-pattern).
Adjust until the vertical-Stripe-shadow as wide as possible or no visible.
This function is adjust the PLL divider of ADC to generate an accurate pixel clock
Example: Hsyn = 31.5KHz Pixel freq. = 25.175MHz (from VESA spec)
The Divider number is (N) = (Pixel freq. x 1000)/Hsyn
From this formula, we get the Divider number, if we fill this number in ADC
register (divider register), the PLL of ADC will generate a clock which have same
period with above Pixel freq. (25.175MHz) the accuracy of this clock will effect the
size of screen. (This clock was called PIXEL-CLOCK)
2. Focus adjustment
Set the Chroma at pattern 63 (cross talk pattern) or WIN98/95 shut down mode
(dot-pattern).
Adjust the horizontal interference as less as possible
This function is adjusting the phase shift of PIXEL-CLOCK to acquire the right
pixel data.
If the relationship of pixel data and pixel clock not so match, we will see the
horizontal interference on screen, we only find this phenomena in crosstalk
pattern or dot pattern, other pattern the affect is very light
3. H/V-Position adjustment
Set the Chroma to pattern 1 (crosshatch pattern) or WIN98/95 full-white pattern
confirm above item 2 & 3 functions (clock & focus) was done well, if that 2
functions failed, the H/V position will be failed too. Adjust the four edges until all
four-edges are visible at the edge of screen.
4. Language function
There have 5 languages for selection, presses “MENU” to select and confirm,
press “UP” or “ DOWN” to change the kind of language (English, Deutch,
Francais, Espanol, Italian)
5. Reset function
Clear each old status of auto-configuration and re-do auto-configuration (for all
mode)
This function also recalls C2 color-temperature.
The descriptions for function control LEDS is as following list
13
1.
Contrast Adjust the picture contrast.
2.
Brightness Adjust the picture brightness.
3.
Input
Selected
Input Signal source selected (select Analog or Digital input
source)
4.
Focus Adjust picture Focus.
5.
Clock Adjust picture Clock.
6.
H- Position Adjust the horizontal position of the picture.
7.
V- Position Adjust the vertical position of the picture.
8.
Language Multi-Language selection
9.
Scaling
Mode
Stretch the picture to fit full screen, screen size ratio or native
size.
10.
Red Adjusts Red intensity.
11.
Green Adjusts Green intensity.
12.
Blue Adjusts Blue intensity.
13 C1
(6500K)
Color
The color temperature for 6500°K is x=0.313, y=0.329.
15. C2
(7800K)
Color
The color temperature for 7800°K is x=0.296, y=0.311.
16.
Reset
Clear each old status of Auto-configuration and re-do auto-
configuration and set the color temperature to 7800°K.
17.
Exit Save user adjustment and OSD disappear.
14
555 55 BLOCK DIAGRAM
6655-1 SPECIAL FUNCTION WITH PRESS-KEY
Press menu button during 2 seconds along with plug-in the DC Power cord:
That operation will set the monitor into “Factory- mode”, in Factory mode we can
do the White balance adjustment with RS232 .In Factory mode, OSD-screen will
locate in left top of screen. Press POWER-button off to on once will quit from
factory mode and back touser-mode. The OSD-index explanation is as following:
1. No signal: No signal input (Signal-cable not connected).
2. Input not supported:
a. Input frequency out of range: H > 92kHz, v > 85Hz or H < 31kHz, v < 55Hz
b. Input frequency out of VESA-spec. (Out of tolerance too far)
5-2 CIRCUIT FUNCTION DESCRIPTION
5-2-1 main board
1. U600, scaler IC gm5020 (all-in-one chip solution for ADC, OSD, scalar and
interpolation):
USE for computer graphics images to convert analog RGB data to digital data with
interpolation process, zooming, generated the OSD font, perform overlay function
and generate drive timing for LCD-PANEL.
2. U502, W78E65 (WINBOND- MCU, type 8052 series with 64k Rom-size and 512
byte ram):
Use for calculate frequency, pixel-dot, detect change mode, rs232-communication,
power-consumption control, OSD-index warning, …etc.
3. U301,ATMEL12524C02N
EEPROM type, 1K ROM-SIZE, for saving Digital DDC-CONTENT.
4. U302, MIRCOCHIP24LC21A
EEPROM type, 1K ROM-SIZE, for saving Analog DDC-CONTENT.
4. U501, 24C16 (ATMEL IC):
EEPROM type, 16K ROM-SIZE, for saving AUTO-config data, White-balance data,
and Power-key status and Backlight-counter data.
5. U901,SI8050(switching regulator 12V to 5V with 3A load current) .
6. U904,AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. U902,RT9164(Linear regulator 5V to 2.5V)
8. U201,U202,LVDS ( use NOVATEK NT7181F)
Convert the TTL signal to LVDS signal , the advantage of LVDS signal is : the
wire can be lengthen and eliminate wire number , low EMI .LVDS signal is high
frequency but low voltage, only 0.35 VPP ,the frequency is seven times higher than
TTL
15
5-2-2 adapter/inverter
1. ADAPTER: CONVERSION-module to convert AC 110V-240V to 12VDC, with 5
AMP
2. INVERTER: CONVERSION-module to convert DC 12V to High-Voltage around
1650V, with frequency 30K-80Khz, 5mA-13mA
5-3 SOFTWARE FLOW CHART
Check White-balance data (C1 & C2) same with the backup data?
Check POC (backlight counter) data same with the backup data?
IF not same, overwrite the data with backup value.
Initial gm5020
POWER-ON START
Initial MCU I/O, Interrupt vector & Ram
Initial 1.POC (backlight counter)
2. Clr all mode value
Check if in Factory mode? (When power-on, press the
MENU Button will be in FACTORY mode)
SET factory mode flag
Check Previous power-switch status from Eeprom, & other system status
MAIN-SUBROTINE LOOP
Check Eeprom is empty?
Clear factory mode flag
16
Main subroutine loop
)
Main loop start
Process Power-saving status (according to below flow-chart result)
Check gm5020 IFM status .is change or not.
And check Signal cable status (cable not connected or not)
** IFM is the register, which measured the HSYN & Vsyn status
Is current system status in Power-saving?
Yes, IFM have change
Wake-up gm5020
(Because gm5020 was in
partial sleeping state)
Check the IFM result is in the standard
Mode table?
Check the IFM result is in the user mode
table?
Out of range (input not support) be
confirm
Set mode index & parameter
Set change mode flag
Confirm the frequency (Hsyn or Vsyn) from IFM already
been changed? (Check the change mode flag)
Process (turn off OSD, setting GM5020according to
above parameter, set LED status, set backlight status)
Check Auto-config mode flag already been set?
Do Auto-config
automatically
Read Key status and Process on OSD-screen
Check Factory mode flag= 1
Monitoring the time-out of osd status (if no key input persist for
10 sec, the osd time-out counter will trigger)
If the RS232 buffer is full,
process the command (while
adjust white-balance in factory
mode)
17
6.MAINTAINABLITY
6-1. EQUITMENTS AND TOOLS REQUIRED
1.) Voltmeter.
2.) Oscilloscope.
3) Pattern Generator.
4) DDC Tool with a personal computer
5) Alignment Tool.
6) LCD Color Analyzer.
7) Service Manual.
8)User Manual.
6-2 TROUBLE SHOOTING
6-2-1 interface board trouble shooting chart
*Use the PC Win 98 white pattern, with some icon on it, and Change the Resolution to
640x480 60 Hz / 31 KHz
**NOTICE: The free-running freq. of our system is 48 KHz / 60 Hz, so we recommend to
use another resolution to do trouble shooting, this trouble shooting is proceed with
640x480 @60Hz 31Khz
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