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SERVICE MANUAL
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
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) 5
1-3-1 PANEL FEATURE 5
1-3-2 DISPLAY CHARACTERISTICS 5
1-3-3 OPTICAL CHARACTERISTICS 6
1-3-4 PARAMETER GUIDE LINE FOR CCFL INVERTER 6
1-4 FACTORY PRESET TIMING LIST 7
1-5 INTERFACE CONNECTOR 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 12
4-2-1 WHITE BALANCE, LUMINANCE ADJUSTMENT 12
4-2-2 OSD ADJUSTMENT 13
5. BLOCK DIAGRAM 15
5-1 SPECIAL FUNCTION WITH PRESS KEY 15
5-2 CIRCUIT FUNCTION DESCRIPTION 15
5-2-1 MAIN BOARD 15
5-2-2 INVERTER/POWER BOARD 16
5-3 SOFTWARE FLOW CHART 16
6. MAINTAINABILITY 18
6-1 EQUITMENT AND TOOLS REQUIRED 18
6-2 TROUBLE SHOOTING 18
6-2-1 INTERFACE-BOARD TROUBLE-SHOOTING CHART 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
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
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.
Main-board Block diagram
Analog RGB
DDC-chip Gm5020 (U600)
Data Digital RGB
LVDS chip
PANEL
Oscillator 24 Panel Control Signal:
Phs, Pvs, PclkA/B,
Pdispe
Communication signal:
Hclk, Hfs, Hdata0 Panel Power 5V
MCU (U502) Panel-Power Control
(U203)
Crystal 24 MHz
Keyboard module
EXTERNAL-ADAPTER
INVERTER
module
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/m˛] 250 cd/m˛@7mA (Typ)
Contrast Ratio 600:1(Typ)
Optical Response Time [msec] 25(Typ)
Nominal input Voltage VDD [Volt] +5.0V
Power consumption 28W (Typ.) (w/o Inverter, All white pattern)
(VDD line + CCFL line) [Watt]
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 0 to +50
[ ]
Operating -20 to +60
[ ]
Storage (Shopping)
1-3-3 Optical Characteristics
The optical characteristics are measured under stable conditions at 25 (Room
Temperature):
ITEM UNIT CONDITIONS MIN TYP. MAX.
[degree] Horizontal (Right) 85
75
[degree] CR=10(Left) 85
Viewing Angle
[degree] Vertical (Up) 85
75
[degree] CR=10(Down) 85
Contrast ratio Normal Direction 400 600
[m sec] Raising Time 15 25
Response Time (Note 1) [m sec] Falling Time 10 15
[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
Color Coordinates (CIE) White White x 0.28 0.31 0.34
White Luminance at CCFL White y 0.3 0.33 0.36
[cd/ ]
7.0mA
(central point) 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=100KX4(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=100K
Start voltage Vst 1870 1970 2070 Vrms RL=CCFL
Protect delay time PDT 1 1.5 3 Sec
INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=100KX4(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=100K
1-4 FACTORY PRESET TIMING LIST
VESA MODES
Horizontal Vertical
Nominal Sync Nomina Sync Nominal
Frequenc Polarit l Polarity Pixel
Mode Resolution Total y y Freq. Clock
+/- +/- 1 Hz (MHz)
0.5kHz
640x480@60Hz 800 x 525 31.469 N/P 59.940 N/P 25.175
VGA 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
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
SVGA 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
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
XGA
1024x768@75Hz 1312x800 60.023 N/P 75.029 N/P 78.750
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
SXGA 1280x1024@75Hz 1688x1066 79.976 N/P 75.025 N/P 135.000
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.
IBM MODES
Horizontal Vertical
Nominal
Nominal Sync Nominal Sync
Pixel
Mode Resolution Total Frequency Polari Freq. Polarit
Clock
+/- 0.5kHz ty +/- 1 Hz y
(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
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 )
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 plugin 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:
1 5
6
10
11 15
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
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 Power-
On 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.
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
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
1. Contrast Adjust the picture contrast.
2. Brightness Adjust the picture brightness.
Input Input Signal source selected (select Analog or Digital input
3.
Selected 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
Scaling Stretch the picture to fit full screen, screen size ratio or native
9.
Mode size.
10. Red Adjusts Red intensity.
11. Green Adjusts Green intensity.
12. Blue Adjusts Blue intensity.
(6500K)
13 C1 The color temperature for 6500°K is x=0.313, y=0.329.
Color
(7800K)
15. C2 The color temperature for 7800°K is x=0.296, y=0.311.
Color
Clear each old status of Auto-configuration and re-do auto-
16. Reset
configuration and set the color temperature to 7800°K.
17. Exit Save user adjustment and OSD disappear.
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
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
POWER-ON START
Initial MCU I/O, Interrupt vector & Ram
Yes Initial 1.POC (backlight counter)
Check Eeprom is empty?
2. Clr all mode value
No
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.
OK
Check Previous power-switch status from Eeprom, & other system status
Initial gm5020
Yes
Check if in Factory mode? (When power-on, press the
MENU Button will be in FACTORY mode) SET factory mode flag
No
Clear factory mode flag
MAIN-SUBROTINE LOOP
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
No Yes, IFM have change Wake-up gm5020
Yes (Because gm5020 was in
Is current system status in Power-saving? partial sleeping state)
No
Yes
Check the IFM result is in the standard Set mode index & parameter
Mode table? Set change mode flag
No Yes
Check the IFM result is in the user mode
table?
No
Out of range (input not support) be
confirm
No Confirm the frequency (Hsyn or Vsyn) from IFM already
been changed? (Check the change mode flag)
Yes, freq had been change
Process (turn off OSD, setting GM5020according to
above parameter, set LED status, set backlight status)
No
Check Auto-config mode flag already been set? Do Auto-config
automatically
Yes
Read Key status and Process on OSD-screen
Yes
If the RS232 buffer is full,
Check Factory mode flag= 1 process the command (while
adjust white-balance in factory
No mode)
Monitoring the time-out of osd status (if no key input persist for
10 sec, the osd time-out counter will trigger)
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
I. No screen appear DC-Power Part
Measured Input DC-voltage (J1)= 12 V?
Measured U901 SI-8050 pin4=5V?
Measured U904 AIC 1084 pin 2 = 3.3V?
Measured U903 AIC1117 pin 2= 3.3V?
Check Correspondent component.
Measured U902 RT9164 pin 2=2.5v Is there any shortage or cold solder?
Measured U905 AIC 1084 pin2=2.5V
Yes, all DC level exist
Disconnected the Signal cable (Loose the Yes, there have OSD show
Signal cable), Is the screen show No Connected the Signal cable again, Led Green
signal ? Check LED status.
No, nothing is show
Led Orange
Check Power switch is in Power-on
status, and check if Power switch had Replace MCU
Connected the Signal cable again, been stuck?
Check LED status.
Led orange
OK, Keyboard no stuck
Led Green
NG Check Correspondent
component short/open
Check the Wire-Harness from CN201 Measured RGB (r302, r304, r306) H, V Input at (Protection Diode)
Was tight enough? signal input pin13, 15 was there signal? and Signal cable bad?
Check the Wire connection to panel side too
OK, input
OK, Wire tight
Measured Oscillator Block
Check Panel-Power Circuit Block Crystal X501
OK, Panel Power OK OK, clock
Check U600 Data-output Block
Check communication pin between U600 &
MCU pin 2,6,7. , Is it have transition?
OK, U600 data OK
OK, Mcu have transition NG, no transition
Replace Inverter and Check
Inverter control relative circuit
Replace U502 (MCU)
& Check Reset pin 10
Replace U600 (Gm5020) Must be change from High to
Re-do White balance adjust
low when first AC power plug-
in
OK
OK
Note: 1. If Replace "Main board", Please re-do"DDC-content"programmed & "White-balance".
2. If Replace " Inverter" only, Please re-do " White-Balance"
Check the PPWR panel power relative circuit,
R201, R202, Q201, U203 (pin 5,6,7,8)
NG In normal operation, when LED =green, R223
Check R202 should have response from 0V to 5V
Should =0 v,
When we switch the power switch from off to on If PPWR no-response when the power switch
Turn on and turn off, replace the U600-GM5020
OK, R202 have
NG, no Voltage
Measured the U203 pin 5,6,7,8= 5 V? Check U203 pin 1,3= 5V
Replace U203 (Nmos, SI9953)
OK NG
OK Check U502 pin18
NG
Measured the inverter connector CN502 Check the Bklt-On relative circuit, R520, Q503, R519,
Pin 1,2=12V, pin 3 on/off control=5V (on) In normal operation, when LED =green,
R520 Bklt-On should =0 v,
YES, still no screen If Bklt-On no-response when the power switch turn on-off,
Replace the MCU
NG
Replace INVERTER to new-one, and
Check the screen is normal??
OK, & Re-do white
NG, no transition
Measured X501 Oscillator output 24MhZ?
Replace Oscillator X501
OK, has transition NG, no transition
Measured X600 Crystal output 24 KHz? Replace Crystal X300
OK
NG, no transition
Measured DCLK, DHS, DVS, DEN (pin G20,
F20, F19, F18 from U600)
Is there have any transition? Replace GM5020 (U600) or replace
Pclk around 47MHz to 57MHZ, PVS=60.09Hz, main board
PHS around 67 KHz?? (Refer to input
signal=640x480@60 Hz 31k, and LED is green)
If Main Board being replace, please
OK do the DDC content
reprogramming
II (a) the screen is abnormal, stuck at white screen, OSD window can't appear,
but keyboard & LED is normal operation.
At general, this symptom is cause by missing panel data or panel power, so we must
check our wire-harness, which connected to panel or the panel power controller (U203)
Check if the Wire harness from CN201 loose? Tighten it.
Check the wire on both Panel-side and Main board side.
Yes, tight enough
Check the Panel-Power circuit as above (page 20)
U203 pin 5,6,7,8, must be 5V
Yes, Voltage normal
Check U903, which convert the 5V to
Check the LVDS-Power L904= 3.3V?
3.3V
Yes, Voltage normal
Check U600 DATA-OUPUT block as
Check both U201 & U202 LVDS-Input pin 31= 45mhz above (page 20)
65mhz, and pin 28 = Vsyn freq, pin 27 = 45khz- 65 kHz
NG, no data output
Yes, Frequency normal
Replace both LVDS chip (U601 & U602) Check OSCILLATOR Block as
above (page 20)
OK, all clock is normal
Replace U502 MCU and check it RESET
pin 10, must be turn high to low when first
AC power-on
OK, reset is normal
Check U600 DATA-OUTPUT block again
NG, still no data out
Replace U600 GM5020
II. (B) The screen had the Vertical Straight Line, may be stuck in Red, Green or Blue
That symptom is cause by bad Panel issue (might be the Source IC from Panel is cold
soldered or open looped) so replace the panel and try it.
III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN'T BE FIXED BY AUTO KEY
** NOTE: There are so many kinds of interferences,
1). One is caused by some VGA-CARD that not meet VESA spec or power grounding too
bad that influence the circuit.
2). Other is cause by external interferences, move the monitor far from electronic
equipment. (Rarely happened)
Use DOT-pattern, or win98/99 shutdown
mode pattern, press AUTO key, was the OK
END
interferences disappear??
NG, interferences still exist
OK
Adjust FOCUS step by step, until the END
horizontal interferences disappear
NG
Yes, has extension Put away the additional cable
Does your signal-cable have an additional May be the additional cable grounding is
cable for extension?? not quite good.
No additional extension cable
NO, all mode
Does your noise only exist in one mode only?
(Ex: only at 1280x1024 @ 85 Hz, other is normal) Change the Signal-cable to new one or
Try other brand VGA-CARD
(Make sure just only that brand VGA-
CARD has this problem)
That was caused by you VGA-CARD setting, your VGA
card timing back porch / front porch exceed vesa timing
too far, for some new AGP-VGA-CARD such situation
always happened
So in your control-panel icon, select monitor, setting,
advance, screen-adjust, at
Size icon, increase step by step slowly, and press,
AUTO key every step you increase the SIZE repeat
the procedure (increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press
APPLY to save in your VGA
III There is interferences in DOS mode
NOTE: the criteria of doing AUTO-CONFIGURATION: must be a full-size screen, if the
screen not full, the auto-configuration will fail. So in DOS mode, just set your "CLOCK" in
OSD-MENU to zero or use some EDITOR software which can full fill the whole screen (ex:
PE2, HE) and then press "AUTO" Or you can use "DOS1.EXE" which attached in your
Driver disk to optimize DOS mode performance.
IV The panel luminance is down
Use white pattern and resolution 1280x1024 @ 60Hz, CHROMA 7120 measured the
center of panel
Set Contrast, brightness =maximal, RGB= 50 If Y can reach 240 cd/m2 that means
Quit from OSD-screen, measured Y (luminance) The lamp still working well, so we just re-do the
With chroma 7120, check Y= 230 10 cd/m2? white-balance process
As following procedure
OK
NG
Use white-pattern, press MENU button along
OK with AC power-plug in (you will in factory
mode) The OSD-menu will be at left top of
If the Y less than 200 cd/m2 (after the contrast, screen,
brightness = max) then change the LAMP of panel
Press AUTO button to automatically adjust black
level value, you will see the sign PASS
Follow White-Balance, Luminance adjustment
as above, method to more detail procedure
For do a white-balance adjust
6-2-2 INVERTER MODULE TROUBLE SHOOTING CHART
**Note: the Waveform of U901 pin 2 can determined the power situation
1. Stable rectangle waveform with equal duty, freq around 150K-158KHz
that means all power of this interface board is in normal operation
, And all status of 5V & 3.3V is working well
2. Unstable or uneven rectangle waveform without same duty, that means
ABNORMAL operation was happened, check 3.3V or 5V, if short-circuit or bad
component
3. Rectangle waveform with large spike & harmonic pulse on front side means all
3.3v is no load, U600 Gm5020 was shut-down, and only U502 MCU still working,
that means the monitor is in power saving status, all power system is working
well.
NG
OK
NG
OK
pin9=12vvoltage of
C905(+)
NG
OK
OK NG
OK NG
OK NG
OK NG
END
6-2-3 KeyPad Board module trouble-shooting chart
Check U502 MCU pin 43,42,41,40,39 at Mechanical stuck, Check!
NG
High state (5V)? without press any key
OK
NG Check main board PR505 shortage?
Press power key and check U502 pin 43 Replace Tact-switch SW105 at keyboard if still
= low (0V)? no work replace U302 MCU at main-board and
check MCU relative reset circuit, and crystal
OK
Check U502 pin 37 (LED green) will have OK
transition from hi to low or low to hi when we If still no Led green indicator, check LED at
press the power key?? keyboard !! cold solder or bad
NG, MCU no response
Check U502 pin 20= 24MHz? And pin 44 NG
(VDD)=5V? And pin 10 (reset)=0V? At normal If one of these items was NG, check the relative
condition circuit
OK Keep transition that means eeprom no response
Without press key and change mode, Check U502 NG
pin 16,17(SDA, SCL)= hi 5V? Or keep Check U501 eeprom 24LC16 relative circuit,
transition? check U600 pin 7 = low?
NG OK
OK, no keep transition
Check the relative Check U501 pin 8
Replace U502 MCU power circuit, was (vdd)= 5V, and check
there 5v input R501, R503 cold solder
Replace eeprom
7.MECHANICAL OF CABINET FRONT DIS-ASSEMBLY
8.POWER SYSTEM AND CONSUMPTION CURRENT
ADAPTER MODULE INVERTER MODULE
Input AC 110V, 60Hz/240V, 50Hz Input DC 12V
Output DC 12V 5A Output AC 1500V/30K-80KHz
Current 14mA
Main board power system
SI-8050SD, 12V to 5V (5A SPEC)
5V To CPU, Eeprom, 24c21, control-inverter-on.off,
and USB hub
860mA when Cable not connected
841mA when Normal operation
AIC1084 AIC1084 AIC1117
5V to 3.3V 5V to 2.5V 5V to 3.3V
(5A SPEC) (800mA SPEC) (800mAspec)
3.3V 3.3V
2.5V
For GM5020 and For GM5020
USB hub consumption Consumption For LVDS consumption
9. MAIN BOARD SCHEMATIC
Sheet 3 Sheet 5 Sheet 6
RED+ DCLK
RED+ RED- RED+ DCLK DVS DCLK
RED- GREEN+ RED- DVS DHS DVS
GREEN+ GREEN- GREEN+ DHS DEN DHS
GREEN- BLUE+ GREEN- DEN DEN
BLUE+ BLUE- BLUE+ DARED[0..7]
BLUE- BLUE- DARED[0..7] DAGRN[0..7] DARED[0..7]
DAGRN[0..7] DABLU[0..7] DAGRN[0..7]
RXC+ DABLU[0..7] DABLU[0..7]
RXC+ RXC- RXC+ DBRED[0..7]
RXC- RX2+ RXC- DBRED[0..7] DBGRN[0..7] DBRED[0..7]
RX2+ RX2- RX2+ DBGRN[0..7] DBBLU[0..7] DBGRN[0..7]
RX2- RX1+ RX2- DBBLU[0..7] DBBLU[0..7]
RX1+ RX1- RX1+ /PANEL_EN
RX1- RX0+ RX1- LVDS_EN /PANEL_EN
RX0+ RX0- RX0+ LVDS_EN
RX0- RX0-
HS
HS VS HS 6.Display Interface
VS VS
DDC_SCL Sheet 7
DDC_SCL DDC_SDA DDC_SCL
DDC_SDA DDC_SDA FSDATA[0..47]
FSDATA[0..47] FSADDR[0..13] FSDATA[0..47]
FSADDR[0..13] FSADDR[0..13]
3.Input Connectors
FSCLK
FSCLK FSCKE FSCLK
FSCKE FSRAS FSCKE
Sheet 4 FSRAS FSCAS FSRAS
FSCAS FSWE FSCAS
FSWE FSDQM0 FSWE
FSDQM0 FSDQM1 FSDQM0
/RESET FSDQM1 FSDQM2 FSDQM1
/RESET /RESET FSDQM2 FSDQM3 FSDQM2
GPIO[0..7] FSDQM3 FSDQM3
GPIO[0..7] HDATAF[0..3] GPIO[0..7]
HDATAF[0..3] HFS HDATAF[0..3]
HFS HFS 7.Frame Store
HCLK
HCLK /IRQ HCLK
/IRQ /IRQ Sheet 8
/PANEL_EN
/PANEL_EN LVDS_EN
LVDS_EN
4.MCU 5.Gm5020 8.Power
AOC (Top Victory) Electronics Co., Ltd.
Title
Top Level
Size Document Number Rev
A
974-G-SAMSUNG.DSN A
Date: Tuesday, October 01, 2002 Sheet 2 of 8
VGA_5V +5V AVDD_3.3
D302
BAV70
SOT23B D310 D311 D312
4.MCU
2 1 BAV99 BAV99 BAV99
2
1
2
1
2
1
TXD
SHEET 4.MCU /V_CON (R323---U502.24)
3
RXD
AGND AGND AGND
SHEET 4.MCU
C308 R321 R322 VGA_5V
R302 100R C301 0.01uF
5.Gm5020
3
3
3
RED+ SHEET 5.Gm5020
47K 47K
0.1uF R303 100R C302 0.01uF
AGND CN301
11 1
RED- SHEET 5.Gm5020 RED- (C301---U601.E1)
R319 100R 6
VGA_SDA 12 2
R304 100R C303 0.01uF RED- (C302---U601.E2)
GREEN+ SHEET 5.Gm5020
7
13 3 GREEN+ (C303---U601.D2)
R305 100R C304 0.01uF
U302