Lenovo L194 Wide Service Manual
19” LCD Color Monitor Lenovo L194 Wide
Service
Service
Service
Horizontal Frequency
30-81 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.Adjusting the Picture...........................…............6
4.Input/Output Specification............……………............9
4.1.Input Signal Connector............………….................9
4.2.Factory Preset Display Modes.........................10
4.3.Panel Specification.....……...……………..................10
N
5.Block Diagram………...................…………................13
5.1.Software Flow Chart…………………………...........13
5.2.Electrical Block Diagram…………………..….......15
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6.Schematic…………………...................................…17
6.1.Main Board.................................................17
6.2.Power Board....……….…....................................21
6.3.Key Board....……….…....................................23
7.PCB Layout..……………….......................................24
7.1.Main Board……………........................................24
7.2.Power Board….......................................25
7.3.Key Board…………...…….....................................27
8.Maintainability…………….........................................28
8.1.Equipments and Tools Requirement...............28
8.2.Trouble Shooting…………..............................29
9.White-Balance Luminance adjustment………….....35
10.Monitor Exploded View……………………….........37
11.BOM List….....................................................38
12.Different Parts List….....................................50
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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19” LCD Color Monitor Lenovo L194 Wide
Revision List
Revision Date Revision History TPV Model
A00 Aug-16-07 First Version Release T97MMMDBLWG9HN
A01 Aug-23-07 Add New BOM
Add New BOM T97MMMDBLWG9HN
A02 Oct-31-07
A03 May-08-08
A04 May-13-08 Add New BOM T97MMMDDLWG6HN
Add New BOM
Add New BOM
Add New BOM T97MMMDBLWG9HN
Add New BOM
Add New BOM
T97MMMDDLWG9HN
T97MMMDMLWG9HN
T97MMMDDLWG9HN
T97MMMDMLWG9HN
T97MMMDDLWG8HN
T97MMMDLLWG9HN
T97GMMDBLWG7HC
T97GMMDBLWG8HC
T97MMMDBLWG8HN
T97MMMDDLWG9HN
T97MMMDMLWG9HN
T97MMMDDLWG8HN
T97MMMDLLWG9HN
A05 May-25-08 Add New BOM T97MMMDYLWG5HN
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19” LCD Color Monitor Lenovo L194 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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19” LCD Color Monitor Lenovo L194 Wide
1. Monitor Specifications
Items Descriptions
Driving system TFT Color LCD
Type M190A1-L07
Size 48.14cm (19.05")
LCD Panel
Pixel pitch 0.285mm( H )x 0.285mm( V )
Viewable angle 170˚ (H) 160˚ (V) (CR≥10)
Response time (type) 5 ms for CMO panel
Sync. Type H/V TTL
Input
Power Consumption
Contrast Ratio 1000:1(Typical)
Dot Clock 137MHz
White Luminance 400cd/m2(Typical)
Max. Resolution 1440 x 900
Plug & Play VESA DDC2BTM
Power Source 90~264VAC,47~63Hz
H-Frequency 30kHz – 81kHz
V-Frequency 50-76Hz
ON Mode < 36W
Standby/Suspend
OFF Mode <1W
< 2W (Analog),
<2W (Digital)
Max supply current 1.5 A
Dimensions
Weight
Environmental
Considerations
Height(including stand) 380.28 mm
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Depth(including stand) 178.57 mm
Width 440.15 mm
Unpacked Unit 4.15 Kg
Packaged Unit Weight 5.9 Kg
Operating Temp: 0°C to 45°C
Storage Temp: -20°C to 60°C
Operating Humidity: 10% to 80%
Storage Humidity: 5% to 95 %
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19” LCD Color Monitor Lenovo L194 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.
Monitor Block Diagram
Power board
Include: adapter, inverter
AC-IN
100V-240V
CCFL Drive.
Key board
Flat Panel and
CCFL backlight
Main Board
HOST Computer
RS232 Connector
For white balance
adjustment in factory
mode
Video signal, DDC
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19” LCD Color Monitor Lenovo L194 Wide
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The control buttons are located on the right side 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
3.3 Adjusting the Picture
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19” LCD Color Monitor Lenovo L194 Wide
OSD functions
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19” LCD Color Monitor Lenovo L194 Wide
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19” LCD Color Monitor Lenovo L194 Wide
4. Input/Output Specification
4.1 Input Signal Connector
15
6
11 15
Pin No. Description Pin No. Description
10
1. Red Input 9.
2. Green Input 10.
3. Blue Input 11.
4. GND 12.
5. Connection detect 13.
6. Red GND 14.
7. Green GND 15.
8. Blue GND
+5VDC
GND
GND
SDA
H Sync
V Sync
SCL
Pin No Description Pin No Description
1 TMDS data2- 13 TMDS data3+
2 TMDS data2+ 14 +5V
3 TMDS data2/4 shield 15 To check signal cable connected or not.
4 TMDS data4- 16 Hot Plug Detect
5 TMDS data4+ 17 TMDS data0-
6 DDC Clock 18 TMDS data0+
7 DDC data 19 TMDS data0/5 shield
8 Analog Vertical Sync 20 TMDS data5-
9 TMDS data1- 21 TMDS data5+
10 TMDS data1+ 22 TMDS clock shield
11 TMDS data1/3 shield 23 TMDS clock+
12 TMDS data3- 24 TMDS clock-
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19” LCD Color Monitor Lenovo L194 Wide
4.2. Factory Preset Display Modes
4.3 Panel Specification
M190A1-L07 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins
2ch-LVDS interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The
inverter module for Backlight is not built in.
4.3.1 Features
- Super Wide viewing angle.
- Super High contrast ratio
- Super fast response time
- High color saturation
- WXGA+ (1440 x 900 pixels) resolution
- DE (Data Enable) only mode
- LVDS (Low Voltage Differential Signaling) interface
- RoHS Compliance
4.3.2 Display Characteristics
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19” LCD Color Monitor Lenovo L194 Wide
4.3.3 Optical Characteristics
TEST CONDITIONS
The following items should be measured under the test conditions described in table above:
4.3.4 Electrical Characteristics
1. TFT LCD Module
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19” LCD Color Monitor Lenovo L194 Wide
2. Backlight Units
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19” LCD Color Monitor Lenovo L194 Wide
5. Block Diagram
5.1 Software Flow Chat
1
2
N
4
5
Y
6
7
Y
Y
N
N
3
8
9
10
Y
N
12
Y
N
13
11
N
Y
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N
16
18
14
N
19
15
Y
17
Y
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19” LCD Color Monitor Lenovo L194 Wide
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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19” LCD Color Monitor Lenovo L194 Wide
5.2 Electrical Block Diagram
5.2.1 Main Board
Crystal14.31818MHz
(X201)
LCD PANEL
(CN301)
FLASH ROM
PM25LV010A
(U402)
EPR_SDA
EPR_SCL
Key Board
Control
(CN201)
H sync
V sync
RGB
D-Sub
Connector
(CN101)
DB15_SDA
DB15_SCL
EEPROM
M24C02-WMN6TP
(U101)
Scalar IC HUM56AWHL-LF-1 MSTAR
(Include ADC, OSD, MCU)
(U202)
DVI
Connector
(CN103)
DVI_SDA
DVI_SCL
EEPROM
M24C02-WMN6TP
(U102)
M24C04-WMN6TP
EEPROM
(U204)
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19” LCD Color Monitor Lenovo L194 Wide
5.2.2 Inverter/Power Board
Lamp
EMI filter
Bridge
Rectifier and
Filter
Start Circuit: R904，R932，R933
PWM Control IC
IC TEA1530AT
Output
Circuit
Transformer
Transformer
T901
Over
Voltage
Protect
MOSFET
Q802、Q803
5V Rectifier
and Filter
12V Rectifier
and Filter
Feedback
Circuit
CN902
5V
12V
ON/OFF
Feedback
Circuit
Over
Voltage
Protect
PWM Control
IC TL494IDR
ON/OFF Control
Q805/Q808
DIM Control
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