Casper 19CSPR Service Manual
19″ LCD Color Monitor Casper 19CSPR
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Service
Service
Service
Horizontal Frequency
30kHz – 83kHz
TABLE OF CONTENTS
Description Page Description Page
N
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 Control Buttons…………….…..............……...............6
3.2 Attaching the Cables…………..............……...............7
3.3 Adjusting the Picture...........................…....................7
4.Input/Output Specification.............……….……...........10
4.1 Input Signal Connector............…………...................10
4.2 Factory Preset Display Modes.................................10
4.3 Panel Specification.....………………........................11
5.Block Diagram……....................…………...................14
5.1 Software Flow Chart………………..………....….......14
5.2 Electrical Block Diagram….…...………..….....…...16
6.Schematic……………...........................................…18
6.1 Main Board.……...……..........................................18
6.2 Power Board..………..……...................................23
6.3 Key Board..…………….…….................................26
7.PCB Layout..……………….......................................27
7.1 Main Board……………..........................................27
7.2 Power Board…..……….........................................29
7.3 Key Board…..……….............................................31
8.Maintainability…….…...............................................32
8.1 Equipments and Tools Requirement……..............32
8.2 Trouble Shooting..…….………..............................32
9.White-Balance, Luminance adjustment...................38
10.Monitor Exploded View….…….……………............40
11.BOM List………......................................................41
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
19″ LCD Color Monitor Casper 19CSPR
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Revision List
Revision Date Revision History TPV Model
A00 Feb.-26-09 Initial Release T98SM5NBX2KPAN
19″ LCD Color Monitor Casper 19CSPR
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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.)
19″ LCD Color Monitor Casper 19CSPR
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1. Monitor Specifications
Driving system 19" TFT Color LCD
Viewable Image Size 481mm diagonal
LCD Panel
Pixel pitch 0.2835mm( H ) × 0.2835mm( V )
Video R,G,B Analog Interface
Separate Sync. H/V TTL
H-Frequency 30kHz – 83kHz
Input
V-Frequency 55-75Hz
Display Colors 16.7M Colors
Dot Clock 135MHz
Max. Resolution 1440 × 900 @60Hz
Plug & Play VESA DDC 2BTM
ON Mode
≤37W
EPA ENERGYSTAR®
OFF Mode
≤1W
Input Connector 15-pin D-Sub
Input Video Signal Analog:0.7Vp-p(standard), 75 OHM, Positive
Maximum Screen Size Horizontal : 408mm Vertical : 255mm
Power Source 100~240VAC,50~60Hz
Environmental Considerations
Operating Temp: 0° to 40°C Storage Temp.: -20° to 60°C
Operating Humidity : 10% to 85%
Dimension 439.02×365.09×190 (W ×H×D)mm
Weight (N. W.) 3.70kg Unit (net)
Switch Power Key;MENU;+/volume;-/volume;Auto / Exit
Luminance
Image Setup;Color Temp.;Color Boost
Picture Boost
External Controls:
Functions
OSD Setup;Extra
Power Consumption ( Maximum ) 37 Watts
Regulatory Compliance CE
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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.
AC-IN
100V~240V
Monitor Block Diagram
Video signal, DDC
Power Board
(Include Adapter and Inverter)
Flat Panel and
CCFL backlight
Main Board
RS232 Connector
For white balance
adjustment in
factory mode
HOST Computer
CCFT Drive.
Key board
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3. Operating Instructions
General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front 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 position. The power indicator will light up.
3.1 Control Buttons
External Control Button
1. Auto 2. - (left)
3. Power Key 4. MENU
5. +(right)
Front Panel Control
• Power Button:
Press this button to switch ON/OFF of monitor’s power.
• 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.
• - /Volume:
Activates the volume control when the OSD is OFF or navigate through adjustment icons when OSD is ON or adjust
a function when function is activated.
• + /Volume:
Activates the volume control when the OSD is OFF or navigate through adjustment icons when OSD is ON or adjust
a function when function is activated.
• 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 over 2 seconds to activate the Auto Adjustment function.
The Auto Adjustment function is used to set the HPos, VPos, Clock and Focus.
• Power Indicator:
Green — Power On mode.
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Orange — Off mode.
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.
3.2 Attaching the Cables
Cable Connections On Back of Monitor
Connecting Cables
1. Power Cord
2. Signal Cable
3. Audio Cable
Connecting the Power Cord: Connect the power cord into your LCD monitor’s power input socket, and then plug
the other end into a 3-pin AC power outlet. The power cord may be connected to either a wall power outlet or the
power outlet socket on your PC, depending on the type of power cord supplied with your LCD monitor.
Connecting the D-Sub Cable: Connect one end of the 15-pin D-Sub cable to the back of the monitor and connect
the other end to the computer’s D-Sub port.
Connecting the Audio Cable: Connect the audio cable between the monitor’s audio input and the PC’s audio
output.
Caution: If the AC outlet is not grounded (with three holes), install the proper grounding adapter (not supplied).
3.3 Adjusting the Picture
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.
19″ LCD Color Monitor Casper 19CSPR
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The OSD Message
Main Menu
Item
Main
Menu
Icon
Sub Menu
Item
Sub Menu Description
Brightness Backlight Adjustment
Contrast Contrast from Digital-register.
Standard Standard Mode
Text Text Mode
Internet Internet Mode
Game Game Mode
Movie Movie Mode
Eco
Sports Sports Mode
Gamma1 Adjust to Gamma 1
Gamma2 Adjust to Gamma 2
Gamma
Gamma3 Adjust to Gamma 3
Off Disable dynamic contrast ratio
Luminance
DCR
On Enable dynamic contrast ratio
Clock Adjust picture Clock to reduce Vertical-Line noise.
Focus Adjust Picture Phase to reduce Horizontal-Line noise
H. Position Adjust the vertical position of the picture.
Image Setup
V. Position Adjust the horizontal position of the picture.
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Main Menu
Item
Main
Menu
Icon
Sub Menu
Item
Sub Menu Description
Warm Recall Warm Color Temperature from EEPROM.
Normal Recall Normal Color Temperature from EEPROM.
Cool Recall Cool Color Temperature from EEPROM.
sRGB Recall SRGB Color Temperature from EEPROM.
User-B Blue Gain from Digital-register
User-G Green Gain from Digital-register.
User-R Red Gain from Digital-register
User-Y Yellow Gain from Digital-register
User-C Cyan Gain from Digital-register
Color Temp.
User
User-M Magenta Gain from Digital-register
Full Enhance on or off Disable or Enable Full Enhance Mode
Nature Skin on or off Disable or Enable Nature Skin Mode
Green Field on or off Disable or Enable Green Field Mode
Sky-blue on or off Disable or Enable Sky-blue Mode
AutoDetect on or off Disable or Enable AutoDetect Mode
Color Boost
Demo on or off Disable or Enable Demo
Frame Size Adjust Frame Size
Brightness Adjust Frame Brightness
Contrast Adjust Frame Contrast
Hue Adjust Frame Hue
Saturation Adjust Frame Saturation
Position Adjust Frame Position
Picture Boost
Bright Frame on or off Disable or Enable Bright Frame
H. Position Adjust the vertical position of OSD
V. Position Adjust the horizontal position of OSD
Timeout Adjust the OSD Timeout
OSD Setup
Language Select the OSD language
Auto Config Auto adjust the picture to default
DDC/CI Turn ON/OFF DDC/CI Support
Reset yes or no Reset the menu to default
Extra
Information
Show the information of the main image and sub-image
source
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4. Input/Output Specification
4.1 Input Signal Connector
Pin No. Description Pin No. Description
1. Red 9. +5V
2. Green 10. Ground
3. Blue 11. Ground
4. Ground 12. DDC-Serial Data
5. Detect Cable 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
15 - Pin Color Display Signal Cable
15
6
10
11 15
4.2 Factory Preset Display Modes
Standard
Resolution
Horizontal
Frequency
Vertical
Frequency
Dos-mode 720 × 400 31.47kHz 70.0Hz
640 × 480 31.47kHz 60.0Hz
640 × 480 37.86kHz 72.8Hz
VGA
640 × 480 37.50kHz 75.0Hz
800 × 600 37.879kHz 60.0Hz
800 × 600 48.077kHz 72.2Hz
SVGA
800 × 600 46.875kHz 75.0Hz
1024 × 768 48.363kHz 60.0Hz
1024 × 768 56.476kHz 70.0Hz
XGA
1024 × 768 60.021kHz 75.0Hz
1152×864 67.5kHz 75Hz
1280 × 1024 64.000kHz 60.0Hz
SXGA
1280 × 1024 80.000kHz 75.0Hz
1440 × 900 55.93kHz 60Hz
WXGA+
1440 × 900 70.635kHz 75Hz
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4.3 Panel Specification
LTM190M2-L31 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 19.0” is 1440x900 and this model can display up to 16.7 million colors.
4.3.1 General Specifications
19″ LCD Color Monitor Casper 19CSPR
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4.3.2 Optical Characteristics
19″ LCD Color Monitor Casper 19CSPR
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4.3.3 Electrical Characteristics
TFT LCD Module
Back Light Unit
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5. Block Diagram
5.1 Software Flow Chart
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
19″ LCD Color Monitor Casper 19CSPR
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REMARK:
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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