How it Works
AOC
Loading...
LM522
Service Manual
42 pgs1.97 Mb0
Schematic
6 pgs122.88 Kb0
Schematic
6 pgs95.26 Kb0
Table of contents
Loading...

AOC LM-522 Service Manual

LM-522 Service Manual
SERVICE MANUAL
15” LCD Monitor
LM-522
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT
1
LM-522 Service Manual
CONTENT TABLE
1.MONITOR SPECIFICATIONS ......................................................................................................4
2. LCD MONITOR DESCRIPTION ..................................................................................................4
3. OPERATING INSTRUCTIONS....................................................................................................5
3.1 GENERAL INSTRUCTIONS...................................................................................................5
3.2 CONTROL BUTTONS............................................................................................................5
3.3 ADJUSTING THE PICTURE...................................................................................................5
4. INPUT/ OUTPUT SPECIFICATION.............................................................................................7
4.1 INPUT SIGNAL CONNECTO..........................................................................................................7
4.2 FACTORY PRESET DISPLAY MODES ............................................................................................7
4.3 POWER SUPPLY REQUIREMENTS................................................................................................8
4.4 PANEL SPECIFICATION........................................................................................................8
4.4.1 Panel Feature.....................................................................................................................8
4.4.2 Display Characteristics........................................................................................................9
4.4.3 Optical Characteristics.........................................................................................................9
4.4.4 Parameter guideline for CCFL Inverter................................................................................10
4.4.5 Back-light Unite.................................................................................................................10
5. BLOCK DIAGRAM.................................................................................................................... 11
5.1 MONITOR EXPLODED VIEW ...................................................................................................... 11
5.2 SOFTWARE FLOWING CHART ...................................................................................................12
5.3 ELECTRICAL BLOCK DIAGRAM..................................................................................................14
5.3.1 Main Board.......................................................................................................................14
5.3.2 Inverter/Power Board.........................................................................................................14
6. SCHEMATIC..............................................................................................................................16
6.1 MAIN BOARD ..........................................................................................................................16
6.2 POWER BOARD .......................................................................................................................21
7. PCB LAYOUT............................................................................................................................23
7.1 MAIN BOARD ..........................................................................................................................23
7.2POWER BOARD ........................................................................................................................24
7.3 KEYPAD BOARD......................................................................................................................25
8. MAINTAINABILITY....................................................................................................................26
8.1 REQUIREMENTS AND TOOLS REQUIREMENT ..............................................................................26
8.2 TROUBLE SHOOTING ...............................................................................................................27
8.2.1 MAIN BOARD........................................................................................................................27
8.2.2 Key Pad Board .................................................................................................................29
9. WHITE-BALANCE, LUMINANCE ADJUSTMENT....................................................................30
2
LM-522 Service Manual
10. EDIT CONTENT.......................................................................................................................31
11.BOM LIST.................................................................................................................................32
3
LM-522 Service Manual
(
)

1.MONITOR SPECIFICATIONS

• 38 cm (15”) a-si TFT Active matrix LCD panel, 0.297mm dot pitch.
• Microprocessor controlled scan technology
• 16 factory presets , 18 new modes
• Vertical refresh rate 55Hz to 75 Hz
• Horizontal frequency 30kHz to 60kHz
• Resolutions: 640 x 480 up to 1024 x 768
• Universal power supply designed for worldwide application
• CE mark
• TCO-99
• VESA DPMS compliant
• VESA DDC compliant

2. LCD MONITOR DESCRIPTION

The LCD MONITOR will contain a main board, a power board, a ke ypad boa rd and an audio b oard 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 chip s each voltage.
Include Adapter and Inverter
PWPC Board
Monitor Block Diagram
CCFT Drive.
Audio board
Flat Panel and
Main Board
Keyboard
CCFL
RS232 Connector For white balance adjustment in factory mode
AC-IN
HOST Computer
100V-240V
4
Video signal, DDC
LM-522 Service Manual

3. OPERATING INSTRUCTIONS

3.1 GENERAL INSTRUCTIONS

Press the power button to turn the monitor on or off. The other cont rol button s are located in the front 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 CONTROL BUTTONS

AUTO VOL- POWER VOL+ MENU
NO. Name Within OSD Without OSD
1 Auto
1. Exit Sub menu
2. Exit the menu item
1.Move the cursor to down
2 VOL - /
2.Adjust down when menu item selected
3 Power Turn on/off Turn on/off
1.Move the cursor to up
4 VOL + /
2.Adjust up when menu item selected
1.Enter the OSD sub menu
5 MENU
2.Select the OSD menu
Run the Auto Adjust when this button keep to push for 2 second
Open the Brightness menu
Open the contrast menu
Open OSD menu

3.3 ADJUSTING THE PICTURE

5
The descriptions for function control LEDS
LM-522 Service Manual
Main Menu Item
Luminance
Image Setup
Image Position
Main
Menu Icon
Sub Menu Item
Description
Icon
Sub Menu
Contrast
Contrast from Digital-register
Brightness
Backlight Adjustment
Adjust Picture Phase to reduce Horizontal-Line
Focus
noise
Clock
Adjust picture Clock to reduce Vertical-Line noise.
H. Position
Adjust the horizontal position of the picture.
V. Position
Adjust the vertical position of the picture.
Warm N/A Recall Warm Color Temperature from EEPROM.
Cool N/A Recall Cool Color Temperature from EEPROM.
Color Temp.
OSD Setup
Language
OSD Timeout
User / Red
User / Green
User / Blue
Red Gain from Digital-register.
Green Gain Digital-register.
Blue Gain from Digital-register.
Analog N/A Select input signal from analog source (D-Sub) Input Select
Digital N/A Select input signal from digital source (DVI)
H. Position
V. Position
Adjust the horizontal position of the OSD.
Adjust the vertical position of the OSD.
Adjust the OSD timeout.
English N/A Set OSD display language to English. Deutsch N/A Set OSD display language to German. Français N/A Set OSD display language to French.
Español N/A Set OSD display language to Spain.
Information
Reset
Italiano N/A Set OSD display language to Italian.
Simplified Chinese N/A Set OSD display language to Simplified Chinese.
Show the resolution, H/V frequency and input port
Information N/A
of current input timing. Clear each old status of Auto-configuration and set
Yes N/A
the color temperature to Cool.
6
LM-522 Service Manual
No N/A Do not execute reset, return to main menu.
Exit
N/A N/A Exit OSD

4. Input/ Output Specification

4.1 Input Signal Connector

1 Red Video 9 +5 v 2 Green Video 10 Logic Ground 3 Blue Video 11 RS-232 RX 4 RS-232 TX 12 DDC-Serial Data 5 DDC-Return 13 H-Sync. 6 Red Ground 14 V-Sync. 7 Green Ground 15 DDC-Serial Clock 8 Blue Ground
CONNECTOR PIN ASSIGNMENT
15 6
11 15
10

4.2 Factory Preset Display Modes

VESA MODES
Horizontal Vertical
Mode Resolution Total
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
Nominal Frequency +/- 0.5kHz
Sync Polarity
Nominal Freq. +/- 1 Hz
Sync Polarity
Nominal Pixel Clock (MHz)
XGA
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000 1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
IBM MODES
Horizontal Vertical
7
LM-522 Service Manual
Nominal
Mode Resolution Total
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322 DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175 XGA 1024x768@72Hz 1304x798 57.515 P 72.100 P 75.000 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
XGA 1024x768@75Hz 1328x804 60.241 N 74.927 N 80.000
Frequency +/- 0.5kHz
Sync
Polarity
Nominal
Sync
Freq.
Polarity
+/- 1 Hz
Nominal Pixel Clock (MHz)

4.3 Power Supply Requirements

A/C Line voltage range : 100 V ~ 240 V A/C Line frequency range Current : 0.6A max. at 100V , 0.35A max. at 240 V <0.3A Peak surge current : < 55A peak at 240 VAC and cold starting Leakage current : < 3.5mA Power line surge : No advance effects (no loss of information or defect)
Voltage : 12VDC ± 5 % Current : 3.5max

4.4 PANEL SPECIFICATION

4.4.1 Panel Feature
: 50 ± 3Hz, 60 ± 3Hz
with a maximum of 1 half-wave missing per second
8
4.4.2 Display Characteristics
4.4.3 Optical Characteristics
LM-522 Service Manual
9
4.4.4 Parameter guideline for CCFL Inverter
4.4.5 Back-light Unite
LM-522 Service Manual
10

5. Block Diagram

5.1 Monitor Exploded View

LM-522 Service Manual
11

5.2 Software Flowing Chart

LM-522 Service Manual
1
2
4
Y
N
3
5
6
9
10
N
12
N
Y
N
7
Y
N
Y
11
13
8
N
18
Y
14
N
19
Y
12
15
17
Y
N
Y
16
1) MCU initialize
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
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 EPROM. Turn on the LED and set it to green color. Scaler initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there 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?
LM-522 Service Manual
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappears.
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?
13
Loading...
+ 29 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use