AOC EN9110 Service Manual

SERVICE MANUAL

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

TABLE OF CONTENTS

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

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

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

6. MAINTAINABILITY 6-1 EQUITMENT AND TOOLS REQUIRED 6-2 TROUBLE SHOOTING

6-2-1 INTERFACE-BOARD TROUBLE-SHOOTING CHART 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

PAGE

5 5 5 6 6 7 8

12 12 13

15 16 16 18 18 18 18

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

Osc

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.

Analog RGB

DDC-chip

DVI input

DC 12V 5Amp

illator 24

Gm5020 (U600)

MCU (U502)

Main-board Block diagram

Frame store

Data Digital RGB

Panel Control Signal: Phs, Pvs, PclkA/B, Pdis

Communication signal: Hclk, Hfs, Hdata0

Crystal 24 MHz

Audio module (optional)

LVDS chip

PANEL

Panel Power 5V

Panel-Power Control (U203)

USB hub module (optional)

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/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

1-3-3 Optical Characteristics

The optical characteristics are measured under stable conditions at 25℃ (Room

Temperature):

ITEM UNIT CONDITIONS MIN TYP. MAX.

Viewing Angle

Contrast ratio Normal Direction 400 600

Response Time (Note 1)

Color Coordinates (CIE) White

White Luminance at CCFL

7.0mA

(central point)

[degree] [degree] [degree] [degree]

[m sec] Raising Time – 15 25 [m sec] Falling Time – 10 15 [m sec] Raising +Falling – 25 40

[cd/㎡]

Horizontal (Right)

CR=10(Left) Vertical (Up)

CR=10(Down)

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

200 250 –

85 85

– –

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

H.V open Vopen 1550 1700 1850 Vrms NO LOAD

H.V Load Vload 620 670 720 Vrms RL=100KΩ

Start voltage Vst

F 45.0 50.0 55.0 KHZ

1870 1970 2070 Vrms RL=CCFL

FOR 1 LOAD

Protect delay time PDT

1 1.5 3 Sec

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

Nominal

Frequenc

Mode Resolution Total

+/-

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

XGA

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 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.

Sync

Polarit

Nomina

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

IBM MODES

Horizontal Vertical

Nominal

Pixel

Clock

(MHz)

Mode Resolution Total

Nominal

Frequency

+/- 0.5kHz

Sync

Polari

Nominal

Freq.

+/- 1 Hz

Sync

Polarit

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 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

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

11 15

PIN NO.

DESCRIPTION

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.

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

Contrast Adjust the picture contrast.

Brightness Adjust the picture brightness. Input

Selected

Input Signal source selected (select Analog or Digital input source)

10.

11.

12.

13 C1

15. C2

16.

17.

Focus Adjust picture Focus.

Clock Adjust picture Clock.

H- Position Adjust the horizontal position of the picture.

V- Position Adjust the vertical position of the picture.

Language Multi-Language selection

Scaling Mode

Red Adjusts Red intensity.

Green Adjusts Green intensity.

Blue Adjusts Blue intensity. (6500K)

Color (7800K) Color

Reset

Exit Save user adjustment and OSD disappear.

Stretch the picture to fit full screen, screen size ratio or native size.

The color temperature for 6500°K is x=0.313, y=0.329.

The color temperature for 7800°K is x=0.296, y=0.311.

Clear each old status of Auto-configuration and re-do auto-

configuration and set the color temperature to 7800°K.

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

Check Eeprom is empty?

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.

Check Previous power-switch status from Eeprom, & other system status

Initial gm5020

Check if in Factory mode? (When power-on, press the MENU Button will be in FACTORY mode)

Clear factory mode flag

MAIN-SUBROTINE LOOP

Initial 1.POC (backlight counter)

2. Clr all mode value

SET factory mode flag

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

Check the IFM result is in the user mode table?

Check Auto-config mode flag already been set?

Read Key status and Process on OSD-screen

Monitoring the time-out of osd status (if no key input persist for 10 sec, the osd time-out counter will trigger)

)

Yes, IFM have change

Is current system status in Power-saving?

Check the IFM result is in the standard Mode table?

Out of range (input not support) be confirm

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 Factory mode flag= 1

Wake-up gm5020 (Because gm5020 was in partial sleeping state)

Set mode index & parameter Set change mode flag

Do Auto-config automatically

If the RS232 buffer is full, process the command (while adjust white-balance in factory mode)

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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