Lenovo L222 Wide Service Manual
22" LCD Color Monitor Lenovo L222 Wide
Service
Service
Service
Horizontal Frequency
30-83 KHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents…………………………………………...1
Revision List…………………………………………………2
Important Safety Notice………………………………….…3
1. Monitor Specification..............................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…................................................6
3.1. General Instructions...........................…...........6
3.2. Control Button…........................................................6
3.3. OSD Menu….............................................................7
4. Input/Output Specification............……………............10
4.1. Input Signal Connector............………….................10
4.2. Factory Preset Display Modes..........................11
43. Panel Specification.....………………..................11
5. Block Diagram…........................................................15
5.1. Software Flow Chart……………………………….....15
5.2. Electrical Block Diagram………………………......17
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6. Schematic……………......................................19
6.1. Main Board.............................................19
6.2. Power Board....……....................................23
6.3. Key Board.................................................25
7. PCB Layout..…………......................................26
7.1. Main Board………........................................26
7.2. Power Board....……....................................27
7.2. Key Board……………....................................28
8. Maintainability……….......................................29
8.1. Equipments and Tools Requirement..............29
8.2. Trouble Shooting………….............................30
9. White-Balance, Luminance adjustment............36
10. Monitor Explode View…………………..........38
11. BOM List………………………………............39
12. Different Part List………………………............53
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
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22" LCD Color Monitor Lenovo L222 Wide
Revision List
Version Release Date Revision History TPV Model Name
A00 Oct.29, 2007 Initial release
A01 Mar.06,2008 Add new BOM in Item 12
A02 Aug 18,2008 Add new BOM
TC7SMAMY7WH3HC
TC7MMAMY7WH3HN
TC7MMAMY7WH4HN
TC8MA8MY7WG7DN
TC8MA8MC7WG9DN
TC8MMAMY7WG8DN
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22" LCD Color Monitor Lenovo L222 Wide
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
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damage the panel.)
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22" LCD Color Monitor Lenovo L222 Wide
1. Monitor Specifications
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22" LCD Color Monitor Lenovo L222 Wide
(
2. LCD Monitor Description
The LCD monitor will contain a main board, a power board and a key 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.
Power board
Include: adapter, inverter)
AC-IN
100V-240V
Monitor Block Diagram
CCFL Drive.
Main Board
Key Board
Flat Panel and
CCFL backlight
HOST Computer
RS232 Connector
For white balance
adjustment in factory
mode
Video signal, DDC
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22" LCD Color Monitor Lenovo L222 Wide
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at the front of the
panel 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, the power indicator will light up.
-
3.2 Control Buttons
3.2.1 Key Control
3.2.2 Key Function
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22" LCD Color Monitor Lenovo L222 Wide
3.3 OSD Menu
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22" LCD Color Monitor Lenovo L222 Wide
OSD functions
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22" LCD Color Monitor Lenovo L222 Wide
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22" LCD Color Monitor Lenovo L222 Wide
4. Input/ Output Specification
4.1 Input Signal Connector
Analog connectors
Pin No. Description Pin No. Description
1. Red Input 9. +5VDC
2. Green Input 10. GND
3. Blue Input 11. GND
4. GND 12. SDA
5. Connection Detect 13. H-Sync
6. Red GND 14. V-Sync
7. Green GND 15. SCL
8. Blue GND
VGA connector layout
15
6
11 15
10
DVI connectors
Pin Meaning Pin Meaning Pin Meaning
1. TMDS data2- 9. TMDS data1- 17. TMDS data0-
2. TMDS data2+ 10. TMDS data1+ 18. TMDS data0+
3. TMDS data 2/4 shield 11. TMDS data 1/3 shield 19. TMDS data 0/5 shield
4. TMDS data4- (NC) 12. TMDS data3- 20. TMDS data5-
5. TMDS data4+ (NC) 13. TMDS data 3+ 21. TMDS data5+
6. DDC Clock 14. +5V 22. TMDS data shield
7. DDC data 15.
8. Analog Vertical Sync 16. Hot Plug Detect 24. TMDS clock -
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To check signal cable
23. TMDS clock+
connected or not
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22" LCD Color Monitor Lenovo L222 Wide
4.2 Factory Preset Display Modes
4.3 Panel Specification
4.3.1 General Features
LTM220M1-L01 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film
Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back
light unit. The resolution of a 22” is 1680x1050 and this model can display up to 16.7 millions colors.
4.3.2 Features
High contrast ratio, high aperture structure
TN (Twisted Nematic) mode
Wide Viewing Angle
High speed response
WSXGA+ (1680 x 1050 pixels) resolution
Low power consumption
DE (Data Enable) only mode
LVDS (Low Voltage Differential Signaling) interface (2pixel/clock)
Compact Size Design
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RoHS, TCO 03’ compliance
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22" LCD Color Monitor Lenovo L222 Wide
4.3.3 Display Characteristics
4.3.4 Electrical Characteristics
(1) Backlight
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22" LCD Color Monitor Lenovo L222 Wide
(2) TFT-LCD
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22" LCD Color Monitor Lenovo L222 Wide
4.3.5 Optical Characteristics
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22" LCD Color Monitor Lenovo L222 Wide
5. Block Diagram
5.1 Software Flow Chat
1
2
N
4
5
Y
6
7
Y
N
N
3
9
10
Y
N
12
Y
N
11
13
N
Y
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N
16
18
14
N
19
15
Y
17
Y
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22" LCD Color Monitor Lenovo L222 Wide
1) MCU initializes.
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
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?
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22" LCD Color Monitor Lenovo L222 Wide
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5.2 Electrical Block Diagram
5.2.1 Main Board
Panel Interface
Flash Memory
PM25LV010A-100SCE
(U402)
EEPROM
M24C04-WMN6TP
(U204)
SDA
SCL
Scalar TSUMU58BWHL-LF
(Include MCU, ADC, OSD)
Crystal
14.318MHZ
(X201)
(CN301)
(U401)
D-Sub
Connector
(CN101)
H sync
V sync
RGB
Key Control
Interface
(CN201)
D-Data
D-Clock
DVI
Connector
(CN102)
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DDC1_SDA,
DDC1
EEPROM
M24C02
(U101)
SCL
DDC2_SDA,
DDC2_SCL
EEPROM
M24C02
(U102)
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22" LCD Color Monitor Lenovo L222 Wide
5.2.2 Inverter/Power Board
AC input
EMI filter
Bridge
Rectifier
and Filter
Transformer
Rectifier
diodes
Start Circuit: R905
CN902
PWM Control IC
（IC901）
Feedback
Circuit
12V
5V
ON/OFF
Output
Circuit
Transformer MOSFET
Lamp
Over Voltage
PWM
ON/OFF
Control
Feedback
Circuit
Control IC
（IC801）
DIM
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