AOC LM760S User manual

17" LCD Color Monitor AOC LM760S
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Service
Service
Service
Horizontal Frequency
30-80 KHz
TABLEOFCONTENTS
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.
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...................................…............7
4.Input/Output Specification............……………............9
4.1.Input Signal Connector............………….................9
4.2.Factory Preset Display Modes.........................10
4.3.Power Supply Requirements...............................11
4.4.Panel Specification.....………………..................10
5.Block Diagram…….…...................…………................13
5.1.Software Flow Chart…………………..……....….......13
5.2 Electrical Block Diagram………………..…..….......15
6.Schematic……………...............................….....17
6.1.Main Board....................................................17
6.2.Power Board....…….…....................................23
7.PCB Layout..………….......................................25
7.1.Main Board………........................................25
7.2.Power Board….......................................28
7.3.Key Board……….....................................29
8.Maintainability……….......................................30
8.1.Equipments and Tools Requirement...............30
8.2.Trouble Shooting…………..............................31
9.White-Balance, Luminance adjustment…….............36
10.Check List ………………………………………...….37
11.Monitor Exploded View………………………........40
12.BOM List….....................................................41
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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17" LCD Color Monitor AOC LM760S
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Revision List
Revision Date Revision History TPV Model
A00 Nov-24-06 First Version Release T780KKNHK4A1NPE
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17" LCD Color Monitor AOC LM760S
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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.)
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17" LCD Color Monitor AOC LM760S
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1. Monitor Specifications
Items Descriptions
Driving system TFT Color LCD
Type CLAA170EA08
Size 43.2cm(17.0")
Pixel pitch 0.264mm(H) x 0.264mm(V)
Viewable angle 140˚(H) 130˚(V) (CR≥10)
Response time (type) 12ms
Contrast Ratio 500:1
LCD Panel
White Luminance 300cd/m2
Sync. Type H/V TTL
H-Frequency 30kHz – 80kHz
Input
V-Frequency 55-75Hz
ON Mode ≤45W
Power Consumption
OFF Mode ≤2W
Dot Clock 135MHz
Max. Resolution 1280 × 1024 @75Hz
Plug & Play VESA DDC2BTM
Power Source 100~240VAC,47~63Hz
Environmental
Considerations
Operating Temp: 5°C to 35°C
Storage Temp: -20°C to 60°C
Operating Humidity: 10% to 85%
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2. LCD Monitor Description
The LCD monitor will contain 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.
AC-IN
100V-240V
Power board
(Include: adapter, inverter)
Flat Panel and
CCFL backlight
Main board RS232 Connector
For white balance
adjustment in factory
mode
HOST Computer
CCFL Drive.
Video signal, DDC
Monitor Block Diagram
Key board
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3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The control buttons 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, the power indicator will light up.
3.2 Control Buttons
•Power Button:
Press this button to turn the monitor ON or OFF.
•Power Indicator:
Green — Power On mode.
Orange — Off mode.
•MENU / ENTER :
Activate OSD menu when OSD is OFF or activate/de-activate adjustment function when OSD is ON or Exit OSD
menu when in Brightness /Contrast Adjust OSD status.
•Brightness :
Adjust brightness or function adjust.
•Contrast :
Adjust contrast or function adjust.
•Auto Adjust button / Exit:
1. When OSD menu is in active status, this button will act as EXIT-KEY (EXIT OSD menu).
2. When OSD menu is in off status, press this button for 2 seconds to activate the Auto Adjustment function.
The Auto Adjustment function is used to set the HPos, VPos, Clock and Focus.
OSD Lock Function: To lock the OSD, press and hold the MENU button while the monitor is off and then press
power button to turn the monitor on. To un-lock the OSD - press and hold the MENU button while the monitor is off
and then press power button to turn the monitor on.
1. MENU / ENTER 2. / Contrast
3. Power Button/ LED 4. / Brightness
5. Auto Adjust button / Exit
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3.3 Adjusting the Picture
Adjustment steps:
1. Press the MENU-button to activate the OSD window.
2. Press or to navigate through the functions. Once the desired function is highlighted, press the
MENU-button to activate it. If the function selected has a sub-menu, press or again to navigate
through the sub-menu functions. Once the desired function is highlighted, press MENU-button to activate it.
3. Press or to change the settings of the selected function.
4. To exit and save, select the exit function. If you want to adjust any other function, repeat steps 2-3.
OSD TABLE:
Main Menu
Item
Main
Menu Icon
Sub Menu
Item
Sub
Menu Description Adjust
Range Reset Value
Contrast
Contrast from Digital-register. 0-100 Recall Cool
Contrast Value
Luminance
Brightness
Backlight Adjustment 0-100
Recall Cool
Brightness
Focus
Adjust Picture Phase to reduce
Horizontal-Line noise 0-100 Do Auto Config
Image
Setup
Clock
Adjust picture Clock to reduce
Vertical-Line noise. 0-100 Do Auto Config
H. Position
Adjust the horizontal position of
the picture. 0-100 Do Auto Config
Image
Position
V. Position
Adjust the vertical position of the
picture. 0-100 Do Auto Config
Warm N/A
Recall Warm Color Temperature
from EEPROM. N/A
Cool N/A
Recall Cool Color Temperature
from EEPROM. N/A
sRGB N/A
Recall sRGB Color Temperature
from EEPROM. N/A
Color Temp.
User / Red
Red Gain from Digital-register. 0-100
The Color
Temperature will
be set to Cool.
The User R/G/B
value (default is
100) will not be
Modified by
Reset function.
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User /
Green
Green Gain Digital-register. 0-100
User / Blue
Blue Gain from Digital-register. 0-100
Yes
N/A Auto Adjust the H/V Position, Focus and Clock of picture. N/A N/A
Auto Config
(Analog-Onl
y Model)
No N/A
Do not execute Auto Config,
return to main menu. N/A N/A
H. Position
Adjust the horizontal position of
the OSD. 0-100 50
V. Position
Adjust the vertical position of the
OSD. 0-100 50
OSD Setup
OSD
Timeout
Adjust the OSD timeout. 10-120 10
Language
Language N/A Set OSD language N/A
The Language
will be set to
English.
Information
Information N/A
Show the resolution, H/V
frequency and input port of
current input timing.
N/A N/A
Yes N /A Clear each old status of
Auto-configuration. N/A N/A
Reset
No N/A
Do not execute reset, return to
main menu. N/A N/A
Exit
N/A N/A Exit OSD N/A N/A
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4. Input/Output Specification
4.1 Input Signal Connector
Pin No. Description Pin No. Description
1. Red Video 9. +5V
2. Green Video 10. Detect Cable
3. Blue Video 11. RXD
4. TXD 12. DDC-Serial Data
5. Ground 13. H-Sync
6. Red Ground 14. V-Sync
7. Green Ground 15. DDC-Serial Clock
8. Blue Ground
VGA connector layout
15
610
11 15
4.2 Factory Preset Display Modes
4.3 Power Supply Requirements
A/C Line voltage range 100 V ~ 240 V
A/C Line frequency range 50 ±3Hz, 60 ±3Hz
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)
with a maximum of 1 half-wave missing per second
DC output Voltage 12VDC± 5％
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17" LCD Color Monitor AOC LM760S
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4.4 Panel Specification
4.4.1 General Features
CLAA170EA08 is 17.0” color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD panel,
driver ICs, control circuit and backlight. By applying 6 bit digital data, 12801024, 26.2M-color images are displayed
on the 17.0” diagonal screen. Input power voltage is 12.0V for LCD driving. Inverter for backlight is not included in
this module. General specification are summarized in the following table.
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4.4.2 Optical Characteristics
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4.4.3 Electrical Characteristics
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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
8
9
14
11
13
Y
N
15
Y
N16
17
19
Y
N
18
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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
MCU
W78E65P-40
(U402)
Scalar IC TSU17AK
(Include ADC, OSD)
(U401)
D-Sub
Connector
(CN404)
EEPROM
M24C02
(
U405
)
H sync
V sync
RGB
DB15_SDA,
DB15_SCL
Panel Interface
(CN101, CN102)
OSD Control
Interface
(CN403)
Crystal
20MHZ
(
X402
)
EEPROM
AT24C16N
(U403)
Crystal
14.31818MHZ
(
X401
)
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5.2.2 Inverter/Power Board
CN102
EMI filter
Bridge
Rectifier
and Filter
Start Circuit: R906、R907
PWM
Control IC
Transformer
Over
Voltage
Protect
Rectifier
diodes
AC input
12V
ON/OFF Control
PWM
Control IC
Feedback
Circuit
Output
Circuit
Transformer MOSFET
Q203、Q204
Lamp
ON/OFF
DIM
PWM
Feedback
Circuit 12V
5V
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6. Schematic
6.1 Main Board
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