17" LCD Color Monitor |
AOC 719Pa |
Service
Service
Service
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Horizontal Frequency |
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31-80 KHz |
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TABLE OF CONTENTS |
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Description |
Page Description |
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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…………….…...........................…............8
4. Input/Output Specification............……………............11
4.1. Input Signal Connector............………….................11
4.2. Power Supply Requirements...............................12
4.3. Factory Preset Display Modes…….........................12
4.4. Panel Specification.....………...………..................13
5. Block Diagram…..…....................…………................16
5.1. Software Flow Chart………………………....….......16
5.2. Electrical Block Diagram…………..…….........18
6.Schematic……………......................................20
6.1.Main Board………..........................................20
6.2.Power Board...……....................................25
6.3.Key Board...……......................................28
7.PCB Layout..…………......................................29
7.1.Main Board………........................................29
7.2.Power Board….......................................31
7.3.Key Board……………....................................34
8.Maintainability……….......................................35
8.1.Equipments and Tools Requirement..............35
8.2.Trouble Shooting………..............................36
9.White-Balance, Luminance adjustment............42
10.Monitor Exploded View……..…….…............44
11.BOM List………………………………............45
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
1
17" LCD Color Monitor |
AOC 719Pa |
Revision List
Version |
Release Date |
Revision History |
TPV Model Name |
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A00 |
July.07.2008 |
Initial release |
T78SRHDBK1A1DN |
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2
17" LCD Color Monitor |
AOC 719Pa |
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.)
3
17" LCD Color Monitor |
AOC 719Pa |
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1. Monitor Specifications |
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Model number |
719Pa |
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Driving system |
TFT Color LCD |
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Viewable Image Size |
432mm diagoanl |
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LCD Panel |
Pixel pitch |
0.264mm(H) x 0.264mm(V) |
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Video |
R, G, B Analog lnterface & Digital Interface |
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Separate Sync. |
H/V TTL |
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Display Color |
16.7M Colors |
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Dot Clock |
54 MHz |
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Horizontal scan range |
31 kHz - 80 kHz |
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Horizontal scan Size(Maximum) |
337.920mm |
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Vertical scan range |
56 Hz - 75 Hz |
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Vertical scan Size(Maximum) |
270.336mm |
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Optimal preset resolution |
1280 x 1024 (60 Hz) |
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Highest preset resolution |
1280 x 1024 (75 Hz) |
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Resolution |
Plug & Play |
VESA DDC2B/CI |
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Input Connector |
D-Sub 15pin & DVI-D |
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Input Video Signal |
Analog: 0.7Vp-p(standard), 75 OHM, Positive & |
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DVI-D |
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Power Source |
100~240VAC, 50/60Hz |
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Power Consumption |
Active < 37 W |
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Standby < 2 W |
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Speakers |
1.5 W x 2 |
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Connector Type |
15-pin Mini D-Sub & 24 pin DVI-D |
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Signal Cable Type |
Detachable |
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Dimensions & Weight |
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Physical |
Height (with base) |
392.5mm/ 498mm |
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Characteristics |
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Width |
371.5 mm |
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Depth |
250 mm |
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Weight (monitor only) |
5.65kg |
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Weight (with packaging) |
7.1 kg |
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Environmental |
Temperature |
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Operating |
0° to 40° |
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Non-Operating |
-20°to 60° |
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Humidity |
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Operating |
10% to 85% (non-condensing) |
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4
17" LCD Color Monitor |
AOC 719Pa |
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Non-Operating |
5% to 80% (non-condensing) |
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Altitude |
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Operating |
0~ 3000m (0~ 10000 ft ) |
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Non-Operating |
0~ 5000m (0~ 15000 ft ) |
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5
17" LCD Color Monitor |
AOC 719Pa |
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
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CCFL Drive. |
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Flat Panel and |
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CCFL backlight |
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RS232 Connector |
Power board |
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Main Board |
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For white balance |
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(Include: adapter, inverter, audio) |
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adjustment in factory |
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mode |
AC-IN |
Key board |
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Video signal, DDC |
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100V-240V |
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HOST Computer |
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6
17" LCD Color Monitor |
AOC 719Pa |
3. Operating Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor (See Figure). By changing these settings, the picture can be adjusted to your personal preferences.
*The power cord should be connected.
*Press the power button to turn on the monitor. The power indicator will light up.
3.2 Control Buttons
1. Source (Auto) / Exit
2 Eco mode / - 3.Volume / +
4.Menu / Enter
5.Power Button
7
17" LCD Color Monitor |
AOC 719Pa |
3.3 OSD Menu
OSD Settings
•Press the MENU-button to activate the OSD window.
•Press+ or - to navigate through the functions. Once the desired function is highlighted, press the MENU-buttonto 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.
•Press+ or - to change the settings of the selected function. To exit and save, select the exit function. If you want to adjust any other function, repeat steps 2-3.
•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.
•Eco Mode hot key: Press the Eco key continuously to select the Eco mode of brightness when there is no OSD ( Eco mode hot key may not be available in all models).
•Volume adjustment hot key: When there is no OSD, press Volume (+) to active volume adjustment bar, press - or + to adjust volume (Only for the models with speakers).
•Source hot key : When the OSD is closed, press Auto/Source button will be Source hot key function (Only for the models with dual or more inputs) .Press Source button continuously to select the input source showed in the message bar , press Menu/Enter button to change to the source selected.
•Auto configure hot key: When the OSD is closed, press Auto/Source button continuously about 2 second to do auto configure.
8
17" LCD Color Monitor |
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AOC 719Pa |
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Function Control Illustration |
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Luminance |
Adjust Range |
Description |
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Brightness |
0-100 |
Backlight Adjustment |
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Contrast |
0-100 |
Contrast from Digital-register. |
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Standard |
Standard Mode |
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Text |
Text Mode |
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Eco mode |
Internet |
Internet Mode |
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Game |
Game Mode |
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Movie |
Movie Mode |
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Sports |
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Gamma1 |
Adjust to Gamma 1 |
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Gamma |
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Gamma2 |
Adjust to Gamma 2 |
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Gamma3 |
Adjust to Gamma 3 |
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Off |
Disable dynamic contrast ratio |
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DCR |
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On |
Enable dynamic contrast ratio |
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Image Setup |
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Clock |
0-100 |
Adjust picture Clock to reduce Vertical-Line |
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noise. |
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Phase |
0-100 |
Adjust Picture Phase to reduce Horizontal-Line |
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noise |
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H.Position |
0-100 |
Adjust the verticalposition of the picture. |
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V.Position |
0-100 |
Adjust the horizontal position of the picture. |
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Color Temp. |
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Warm |
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6500K |
Recall Warm Color Temperature from EEPROM. |
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Normal |
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7300K |
Recall Normal Color Temperature from |
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EEPROM. |
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Cool |
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9300K |
Recall Cool Color Temperature from EEPROM. |
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sRGB |
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Recall SRGB Color Temperature from |
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EEPROM. |
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Red |
Red Gain from Digital-register |
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User |
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Green |
Green Gain Digital-register. |
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Blue |
Blue Gain from Digital-register |
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9
17" LCD Color Monitor |
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AOC 719Pa |
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Color Boost |
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Full Enhance |
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on or off |
Disable or Enable Full Enhance Mode |
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Nature Skin |
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on or off |
Disable or Enable Nature Skin Mode |
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Green Field |
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on or off |
Disable or Enable Green Field Mode |
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Sky-blue |
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on or off |
Disable or Enable Sky-blue Mode |
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AutoDetect |
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on or off |
Disable or Enable AutoDetect Mode |
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Demo |
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on or off |
Disable or Enable Demo |
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Picture Boost |
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Frame Size |
14-100 |
Adjust Frame Size |
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Brightness |
0-100 |
Adjust Frame Brightness |
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Contrast |
0-100 |
Adjust Frame Contrast |
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Position |
H. position |
Adjust Frame horizontal Position |
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V.position |
Adjust Frame vertical Position |
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Bright Frame |
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on or off |
Disable or Enable Bright Frame |
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OSD Setup |
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.Position |
0-100 |
Adjust the horizontal position of OSD |
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V.Position |
0-100 |
Adjust the vertical position of OSD |
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Timeout |
5-120 |
Adjust the OSD Timeout |
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Transparence |
0-100 |
Adjust the transparence of OSD |
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Language |
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Select the OSD language |
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Extra |
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Auto |
Select to Auto Detect input signal |
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Analog |
Select Analog Sigal Source as Input |
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Input Select |
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Digital |
Select Digital Sigal Source as Input |
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HDMI |
Select HDMI sigal source as input (Only for the |
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Auto Config |
yes or no |
Auto adjust the picture to default |
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Image Ratio |
wide or 4:3 |
Select wide or 4:3 format for display |
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DDC-CI |
yes or no |
Turn ON/OFF DDC-CI Support |
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Information |
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Show the information of the main image and |
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sub-image source |
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Reset |
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Reset |
yes or no |
Reset the menu to default |
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Exit |
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Exit |
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Exit the main OSD |
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10
17" LCD Color Monitor |
AOC 719Pa |
4. Input/Output Specification
4.1 Input Signal Connector
Analog connectors
Pin No. |
Description |
Pin No. |
Description |
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1. |
Video-Red |
9. |
+5V |
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2. |
Video-Green |
10. |
Ground |
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3. |
Video-Blue |
11. |
N.C. |
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4. |
N.C. |
12. |
DDC-Serial Data |
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5. |
Detect Cable |
13. |
H-Sync |
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6. |
GND-R |
14. |
V-Sync |
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7. |
GND-G |
15. |
DDC-Serial Clock |
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8. |
GND-B |
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VGA connector layout
DVI connectors
Pin No. |
Description |
Pin No. |
Description |
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1 |
TMDS Data 2- |
9 |
TMDS Data 1- |
17 |
TMDS Data 0- |
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2 |
TMDS Data 2+ |
10 |
TMDS Data 1+ |
18 |
TMDS Data 0+ |
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3 |
TMDS Data 2/4 Shield |
11 |
TMDS Data 1/3 Shield |
19 |
TMDS Data 0/5 Shield |
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4 |
TMDS Data 4- |
12 |
TMDS Data 3- |
20 |
TMDS Data 5- |
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5 |
TMDS Data 4+ |
13 |
TMDS Data 3+ |
21 |
TMDS Data 5+ |
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6 |
DDC Clock |
14 |
+5V Power |
22 |
TMDS Clock Shield |
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7 |
DDC Data |
15 |
Ground(for+5V) |
23 |
TMDS Clock + |
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8 |
N.C. |
16 |
Hot Plug Detect |
24 |
TMDS Clock - |
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11
17" LCD Color Monitor |
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AOC 719Pa |
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4.2 Power Supply Requirements |
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A/C Line voltage range |
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100 V ~ 240 V |
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A/C Line frequency range |
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50 ± 3Hz, 60 ± 3Hz |
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Current |
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1.5A max at 100V ; 0.8A max at 240 V |
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Peak surge current |
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< 55A peak at 240 VAC and cold starting |
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Leakage current |
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< 3.5mA |
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Power line surge |
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No advance effects (no loss of information or defect) |
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with a maximum of 1 half-wave missing per second |
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DC output Voltage |
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5VDC ± 5 ; 12VDC± 5 |
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Current |
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1.5Amp (5V) 2 Amp (12V) |
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4.3 Factory Preset Display Modes |
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Stand |
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Resolution |
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Horizontal |
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Vertical |
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Frequency(kHz) |
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Frequency(Hz) |
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Dos-mode |
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720 x 400 |
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31.47 |
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70.0 |
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VGA |
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640 x 480 |
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31.47 |
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60.0 |
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640 x 480 |
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37.50 |
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75.0 |
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SVGA |
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800 x 600 |
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37.879 |
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60.0 |
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800 x 600 |
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46.875 |
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75.0 |
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1024 x 768 |
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48.363 |
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60.0 |
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1024 x 768 |
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56.476 |
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70.0 |
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XGA |
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1024 x 768 |
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60.02 |
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75.0 |
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1024 x 768 |
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48.780 |
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60.0 |
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1024 x 768 |
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60.241 |
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75.0 |
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SXGA |
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1280 x 1024 |
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64.00 |
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60.0 |
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1280 x 1024 |
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80.00 |
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75.0 |
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12
17" LCD Color Monitor |
AOC 719Pa |
4.4 Panel Specification |
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4.4.1 General Features |
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LTM170EU-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 17.0“ is 1280x 1024 and this model can display up to 16.7 millions colors.
RoHS compliance (Pb-free)
High contrast ratio, high aperture ratio, fast response time
TN(Twisted Nematic) mode
2 dual CCFTs(Cold Cathode Fluorescent Tube)
DE(Data Enable) mode
LVDS (Low Voltage Differential Signaling) interface (2pixel/clock)
COMPACT SIZE DESIGN
TCO’03 compliance
4.4.2Display Characteristics
13
17" LCD Color Monitor |
AOC 719Pa |
4.4.3Electrical Characteristics
(1)TFT-LCD
(2) Backlight
14
17" LCD Color Monitor |
AOC 719Pa |
4.4.4 Optical Characteristics
15
17" LCD Color Monitor
5. Block Diagram
5.1 Software Flow Chat
1
2
N
4
5
Y
6
7
Y
9
AOC 719Pa
Y
3
N
N
8
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10 |
N |
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11 |
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Y |
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N |
12 |
13 |
N |
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Y |
Y |
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14 |
15 |
N |
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16 |
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Y |
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17 |
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N
18 19
Y
16
17" LCD Color Monitor |
AOC 719Pa |
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?
17
17" LCD Color Monitor |
AOC 719Pa |
5.2 Electrical Block Diagram |
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5.2.1 Main Board |
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Crystal 24MHz
(X401)
EPR_SDA
MCU
EEPROM EPR_SCL CRYSTAR_OUT
RTD2120L-LF
AF24BC16-SI (U403)
(U401) RTD_SCLK RTD_SD3/SDI
DDC1_SCL
DDC1_SDA
Key Board Control
(CN202)
DDC2_SCL
DDC2_SDA
LCD Interface
(CN601)
Scalar IC RTD2525LH-GR
(Include ADC, OSD)
(U501)
H sync |
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D-Data |
V sync |
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D-Clock |
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RGB |
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D-Sub |
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DVI |
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Connector |
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Connector |
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(CN301) |
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(CN302) |
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18