19" Wide LCD Color Monitor |
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AOC 1912VWA |
Service
Service
Service
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Horizontal Frequency |
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TABLE OF CONTENTS |
30 kHz-80 kHz |
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Description |
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Description |
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Table Of Contents.......…….................……...........…........1 |
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6. |
Schematic……………..............................….....19 |
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Revision List.…........................………................……......2 |
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6.1 Main Board…………..............................................19 |
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Important Safety Notice.………….…..................……......3 |
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6.2 Power Board....……………....................................24 |
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1. Monitor Specification.................................………........4 |
6.3 Key Board ……………………………..…………….26 |
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2. LCD Monitor Description…………………………….......5 |
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6.4 Audio Board....……................................................27 |
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3. Operation |
Instruction…………...................…...........6 |
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7. PCB Layout..………….......................................28 |
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3.1 General Instructions.....................................…...........6 |
7.1 |
Main Board……………......................................28 |
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3.2 Control Button……………………………..……...........6 |
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7.2 Power Board…......................................................31 |
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3.3 Adjusting the Picture...........................…............8 |
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7.3 Audio Board....…….......................................33 |
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4. Input/Output Specification............……………............10 |
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7.4 |
Keypad |
Board……….....................................33 |
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4.1 Input Signal Connector............…..……................10 |
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Maintainability……….......................................34 |
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4.2 Factory Preset Display Modes.........................11 |
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8.1. Equipments and Tools Requirement.....................34 |
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4.3 Panel Specification.....………………........................12 |
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8.2. Trouble Shooting…………....................................35 |
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5.Block Diagram…….…................……………...............15 |
9. White-Balance, Luminance adjustment...................41 |
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5.1 Software Flow Chart…………………………….........15 |
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10.Monitor Exploded View……..……………............42 |
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5.2 Electrical |
Block Diagram…………………...…......17 |
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11.BOM List....…….....................................................43 |
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
19" Wide LCD Color Monitor |
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AOC 1912VWA |
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Revision List |
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Revision |
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Revision History |
TPV Model |
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A00 |
Dec-27-2006 |
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Initial release |
T96HNNNQWCAO8P |
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2
19" Wide LCD Color Monitor |
AOC 1912VWA |
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
19" Wide LCD Color Monitor |
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AOC 1912VWA |
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1. Monitor Specifications |
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Driving system |
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TFT Color LCD |
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LCD Panel |
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Size |
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48cm(19.0") |
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Pixel pitch |
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0.2835mm( H ) × 0.2835mm( V ) |
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Video |
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R,G,B Analog Interface |
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Input |
Separate Sync. |
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H/V TTL |
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H-Frequency |
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30kHz – 80kHz |
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V-Frequency |
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55-75Hz |
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Display Colors |
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16.2M Colors |
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Dot Clock |
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135MHz |
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Max. Resolution |
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1440 × 900 @60Hz |
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Plug & Play |
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VESA DDC2BTM |
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EPA ENERGY STAR® |
ON Mode |
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≤36W |
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OFF Mode |
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≤1W |
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Input Connector |
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15-pin D-Sub |
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Input Video Signal |
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Analog:0.7Vp-p(standard), |
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75 OHM, Positive |
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Maximum Screen Size |
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Horizontal : 408.24mm |
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Vertical : 255.15mm |
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Power Source |
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100~240VAC,50~60Hz |
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Environmental |
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Operating Temp: 5° to 50°C |
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Storage Temp.: -20° to 60°C |
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Considerations |
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Operating Humidity: 10% to 85% |
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Dimension |
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425 (W)×418 (H)×207 (D)mm |
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Weight (N. W.) |
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5.9kg Unit (net) |
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Power Consumption( Maximum ) |
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36 Watts |
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Audio Output |
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Rated Power 1.5 W rms (Per channel) |
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Regulatory Compliance |
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FCC UL CUL, TUV-S |
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4
19" Wide LCD Color Monitor |
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AOC 1912VWA |
2. LCD Monitor Description
The LCD MONITOR will contain a main board, a power board, an audio 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) |
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adjustment in factory |
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mode |
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Audio board |
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Key board |
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Video signal, DDC |
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AC-IN |
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100V-240V |
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HOST Computer |
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5
19" Wide LCD Color Monitor |
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AOC 1912VWA |
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.
3.2Control Buttons
EXTERNAL CONTROLS
1. |
Auto Adjust Key/Exit |
4. |
> / Volume |
2. |
< / Volume |
5. |
MENU/ENTER |
3. |
Power Key/ LED |
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6
19" Wide LCD Color Monitor |
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AOC 1912VWA |
FRONT PANEL CONTROL
•Power Button / Power Indicator:
Press this button to turn the monitor ON or OFF. 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 Volume 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 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.
NOTES
•Do not install the monitor in a location near heat sources such as radiators or air ducts, or in a place subject to direct sunlight, or excessive dust or mechanical vibration or shock.
•Save the original shipping carton and packing materials, as they will come in handy if you ever have to ship your monitor.
•For maximum protection, repackage your monitor as it was originally packed at the factory.
•To maintain the cleanness of your LCD display, wipe it periodically with clean and soft cloth. The screen may be damaged by any liquid splash.
•To keep the monitor looking new, periodically clean it with a soft cloth. Stubborn stains may be removed with a cloth lightly dampened with a mild detergent solution. Never use strong solvents such as thinner, benzene, or abrasive cleaners, since these will damage the cabinet. As a safety precaution, always unplug the monitor before cleaning it.
7
19" Wide LCD Color Monitor |
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AOC 1912VWA |
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.
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The OSD Message |
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Main |
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Main |
Sub |
Sub Menu |
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Menu |
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Menu |
Menu |
Description |
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Item |
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Icon |
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Luminance |
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Contrast |
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Contrast from Digital-register. |
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Brightness |
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Backlight Adjustment |
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Image Setup |
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Focus |
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Adjust Picture Phase to reduce Horizontal-Line noise |
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Clock |
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Adjust picture Clock to reduce Vertical-Line noise. |
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Image |
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H. Position |
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Adjust the horizontal position of the picture. |
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Position |
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V. Position |
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Adjust the vertical position of the picture. |
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Warm |
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N/A |
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Recall Warm Color Temperature from EEPROM. |
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Cool |
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N/A |
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Recall Cool Color Temperature from EEPROM. |
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Color Temp. |
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sRGB |
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N/A |
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Recall sRGB Temperature from EEPROM. |
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User / Red |
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Red Gain from Digital-register. |
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User / Green |
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Green Gain Digital-register. |
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User / Blue |
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Blue Gain from Digital-register. |
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8
19" Wide LCD Color Monitor |
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AOC 1912VWA |
Main |
Main Menu |
Sub |
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Menu |
Menu |
Sub Menu Icon |
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Input Select |
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Analog |
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N/A |
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Digital |
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N/A |
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H. Position |
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OSD Setup |
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V. Position |
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OSD Timeout |
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Language |
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Language |
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N/A |
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Information |
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Information |
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N/A |
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Reset |
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Yes |
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No |
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N/A |
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Exit |
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N/A |
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N/A |
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Description
Select input signal from analog source (D-Sub).
Select input signal from digital source (DVI).
Adjust the horizontal position of the OSD.
Adjust the vertical position of the OSD.
Adjust the OSD timeout.
Set OSD language
Show the resolution, H/V frequency and input port of current input timing.
Clear each old status of Auto-configuration. Do not execute reset, return to main menu. Exit OSD
9
19" Wide LCD Color Monitor |
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AOC 1912VWA |
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4. Input/Output Specification |
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4.1 Input Signal Connector |
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Pin No. |
Description |
Pin No. |
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1. |
Red |
9. |
+5V |
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2. |
Green |
10. |
Detect Cable |
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3. |
Blue |
11. |
Ground |
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4. |
Ground |
12. |
DDC-Serial Data |
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5. |
Ground |
13. |
H-Sync |
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6. |
R-Ground |
14. |
V-Sync |
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7. |
G-Ground |
15. |
DDC-Serial Clock |
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8. |
B-Ground |
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15 - Pin Color Display Signal Cable
1 |
5 |
6 |
10 |
11 |
15 |
Pin No. |
Description |
Pin No. |
Description |
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1. |
TMDS Data 2- |
13. |
TMDS Data 3+ |
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2. |
TMDS Data 2+ |
14. |
+5V Power |
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3. |
TMDS Data 2/4 Shield |
15. |
Ground(for+5V) |
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4. |
TMDS Data 4- |
16. |
Hot Plug Detect |
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5. |
TMDS Data 4+ |
17. |
TMDS Data 0- |
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6. |
DDC Clock |
18. |
TMDS Data 0+ |
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7. |
DDC Data |
19. |
TMDS Data 0/5 Shield |
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8. |
N.C. |
20. |
TMDS Data 5- |
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9. |
TMDS Data 1- |
21. |
TMDS Data 5+ |
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10. |
TMDS Data 1+ |
22. |
TMDS Clock Shield |
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11. |
TMDS Data 1/3 Shield |
23. |
TMDS Clock + |
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12. |
TMDS Data 3- |
24. |
TMDS Clock - |
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24 - Pin Color Display Signal Cable
10
19" Wide LCD Color Monitor |
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|
AOC 1912VWA |
|||||
4.2 Factory Preset Display Modes |
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Standard |
Resolution |
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Horizontal |
Vertical |
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Frequency |
Frequency |
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Dos-mode |
720 x 400 |
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31.47kHz |
70.0Hz |
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VGA |
640 × 480 |
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31.47kHz |
60.0Hz |
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640 × 480 |
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37.50kHz |
75.0Hz |
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SVGA |
800 |
× 600 |
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37.879kHz |
60.0Hz |
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800 |
× 600 |
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46.875kHz |
75.0Hz |
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1024 × 768 |
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48.363kHz |
60.0Hz |
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XGA |
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1024 × 768 |
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56.476kHz |
70.0Hz |
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1024 × 768 |
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60.021kHz |
75.0Hz |
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SXGA |
1280 |
× 1024 |
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64.000kHz |
60.0Hz |
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1280 |
× 1024 |
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80.000kHz |
75.0Hz |
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WXGA+ |
1440×900 |
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55.935 kHz |
60.0 Hz |
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11
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
4.3 Panel Specification
HannStar Display model HSD190MGW1-A00 is a color active matrix thin film transistor (TFT) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. This model is composed of a TFT LCD panel, the voltage reference, common voltage, DC-DC converter, column, and row driver circuit. This TFT LCD has a 19-inch diagonally measured active display area with WXGA+ resolution (900 vertical by 1440 horizontal pixel array).
4.3.1 Display Characteristics
12
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
4.3.2 Optical Characteristics
13
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
4.3.3 Parameter guide line for CCFL Inverter
TFT LCD Module:
Back Light Unit:
14
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
5. Block Diagram
5.1 Software Flow Chat
1
2 |
Y |
3 |
|
N
4
5 N
Y
6
7 |
N |
8 |
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Y
9
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10 |
N |
11 |
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Y |
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N |
12 |
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13 |
N |
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Y |
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Y |
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14 |
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15 |
N |
16 |
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Y |
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17 |
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18 |
N |
19 |
|
Y
15
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
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?
16
19" Wide LCD Color Monitor |
|
AOC 1912VWA |
5.2 Electric Block Diagram
5.2.1 Main Board
Panel Interface
(CN406)
Keypad Interface |
|
NT68663MEFG |
(CN403) |
|
|
|
(Include MCU, ADC, OSD) |
|
|
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|
|
(U401) |
SDA
SCL RXD RGB H-SYNC
TXD V-SYNC
EEPROM |
|
|
|
|
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|
|
Crystal 12MHz |
|
|
|
|
|
|
|
|
D-Sub Connector |
|
||
AT24C16AN-10SU-2.7 |
|
|
|
|||
|
(X401) |
|
|
|
||
(U403) |
|
|
(CN405) |
|
||
|
|
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|
|
DB15_SDA |
|
|
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|
|
DB15_SCL |
|
|
|
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|
|
EEPROM M24C02 |
|
|
|
|
|
|
(U405) |
|
17