Avalon 225WT Service Manual
22" LCD Color Monitor Avalon 225WT
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Service
Service
Service
Horizontal Frequency
30-83 KHz
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
Important Safety Notice.……..................……......3
1.Monitor Specification..............................………........4
2.LCD Monitor Description…………………………….......6
3.Operation Instruction…………...............……...........7
3.1.General Instructions...........................…...........7
3.2.Control Button…………….…..............……...............7
3.3.OSD Menu…………….…...........................…............9
4.Input/Output Specification............……………...........11
4.1.Input Signal Connector............…………................11
4.2.Factory Preset Display Modes..........................12
4.3.Panel Specification.....………………..................11
5.Block Diagram…..…...................…………................15
5.1.Software Flow Chart……………..…………....….......15
5.2.Electrical Block Diagram……………..….......17
6.Schematic……………......................................19
6.1 Main Board……..............................................19
6.2 Power Board....……....................................23
7.PCB Layout..………….......................................23
7.1.Main Board………........................................25
7.2.Power Board....……....................................28
7.3.Key Board…………….....................................30
7.4 Audio Board……………..................................30
8.Maintainability……….......................................31
8.1.Equipments and Tools Requirement...............31
8.2.Trouble Shooting…………..............................32
9.White-Balance, Luminance adjustment.............38
10.Monitor Explode View………..…….…............40
11.BOM List…………………………………............41
22" LCD Color Monitor Avalon 225WT
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Revision List
Version Release Date Revision History TPV Model Name
A00 Oct.-18-07 Initial release
TC7MMADBWKVLAN
22" LCD Color Monitor Avalon 225WT
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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The special
tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock,
fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC. AOC
assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result
in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)
22" LCD Color Monitor Avalon 225WT
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1. Monitor Specifications
22" LCD Color Monitor Avalon 225WT
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22" LCD Color Monitor Avalon 225WT
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2. LCD Monitor Description
The LCD monitor will contain a main board, a power board, a key board and an audio board which house the flat
panel control logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
AC-IN
100V-240V
Power board
(
Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main Board
CCFL Drive.
Monitor Block Diagram
Audio
Board
D-SUB
INPUT
Key
Board
22" LCD Color Monitor Avalon 225WT
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3. Operating Instructions
3.1 General Instructions
3.2 Control Buttons
3.2.1 Key Control
3.2.2 Key Function
22" LCD Color Monitor Avalon 225WT
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FRONT PANEL CONTROL
22" LCD Color Monitor Avalon 225WT
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3.3 OSD Menu
22" LCD Color Monitor Avalon 225WT
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22" LCD Color Monitor Avalon 225WT
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4. Input/Output Specification
4.1 Input Signal Connector
Analog connectors
Pin No. Description Pin No. Description
1. Video-Red 9. +5V
2. Video-Green 10. Logic Ground
3. Video-Blue 11. RS232
4. RS232 12. DDC-Serial Data
5. DDC-Return 13. H-Sync
6. GND-R 14. V-Sync
7. GND-G 15. DDC-Serial clock
8. GND-B
VGA connector layout
22" LCD Color Monitor Avalon 225WT
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4.2 Factory Preset Display Modes
VESA MODES
Horizontal Vertical
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polarit
y
Nominal
Freq.
+/- 1 Hz
Sync
Polari
ty
Nominal
Pixel Clock
(MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
VGA
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
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
SVGA
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
1024x768@72Hz 1304x798 57.7 P 72 P 78.4
XGA
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
1280x1024@70Hz 74.4 P 70 P 124.9
1280x1024@72Hz 77.9 P 72 P 134.6
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
SXGA
1280x960@60Hz 1800x1000 60 P 60 P 108
WSXGA 1680x1050@60Hz 2240x1089 65.29 N 59.95 P 146.25
IBM MODES
Horizontal Vertical
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 1304 x 798 57.515 P 72.1 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
1024x768@60Hz 1312x813 48.780 N 60.001 N 64.000 XGA
1024x768@75Hz 1328x804 60.241 N 74.927 N 80.000
22" LCD Color Monitor Avalon 225WT
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4.3 Panel Specification
4.3.1 General Description
The M220Z1-L01 model is a 22 inch wide TFT-LCD module with a 4-CCFL Backlight Unit and a 30-pin
2ch-LVDS interface. This module supports 1680 x 1050 WSXGA
+ (16:10 wide screen) mode and displays
up to 16.7 millions colors. The inverter module for the Backlight Unit is not built in.
4.3.2 Features
- Super wide viewing angle
- High contrast ratio
- Fast response time
- High color saturation (EBU Like Specifications)
- WSXGA+ (1680 x 1050 pixels) resolution
- DE (Data Enable) only mode
- LVDS (Low Voltage Differential Signaling) interface
4.3.3 Display Characteristics
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4.3.4 Optical Characteristics
4.3.5 Absolute Maximum Ratings
(1) TFT-LCD Module
(2) Backlight Unit
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5. Block Diagram
5.1 Software Flow Chat
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18
22" LCD Color Monitor Avalon 225WT
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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.
Scalar initializes.
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?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
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5.2 Electrical Block Diagram
5.2.1 Main Board
EEPROM
M24C02
(
U404
)
EEPROM
24LC16B/SNG
(U403)
Panel Interface
(CN101)
SDA
SCL
Crystal
14.318MHZ
(X401)
Flash Memory
PM25LV010-25SCE
(U402)
Scalar TSUMU58WHJ-LF
(Include MCU, ADC, OSD)
(
U401
)
H sync
V sync
RGB
VGA_SDA,
VGA
_
SCL
D-Sub
Connector
(CN405)
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