AOC TFT-LCD Color Monitor 731FW Service Manual

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Text of AOC TFT-LCD Color Monitor 731FW Service Manual

17" LCD Color Monitor

AOC 731FW

Service Service Service

Horizontal Frequency 36.5-57.75 kHz

TABLE OF CONTENTSDescription Page Description Page

Table Of Contents...........................................1 Revision List...............................................2 Important Safety Notice..........................3 1.Monitor Specifications......................................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........................10 4.1.Input Signal Connector...........................10 4.2.Factory Preset Display Modes.........................10 4.3.Panel Specification..........................11 5.Block Diagram....................................13 5.1.Software Flow Chart .. .........1 3

5.2.Electrical Block Diagram .. .........1 5 6.Schematic ..................... ...............1 7 6.1 Main Board..........................................17 6.2 Power Board..................................................22 7.PCB Layout.. ..................................24 7.1.Main Board...........................................24 7.2.Power Board ...........................................26 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.Differnent Parts List.49

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 R FOR TH UNIT WHEN S 1

17" LCD Color Monitor Revision ListRevision Date Revision History

AOC 731FWTPV Model T77CMBNPW5A5NN T77CMBNQW5A2NN

A00

Apr.-21-2008

First Version Release T77CMBNQW5A3NN T77CMBNQW5A4NN T77CMBNQW5A17N

A01 A02

May-06-2008 May-11-2008

Add new BOM T77CMBNPW5A5NG Add new BOM T77CMBNCW5A2NN

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17" LCD Color Monitor Important Safety Notice

AOC 731FW

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 persons 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 1. Monitor SpecificationsModel number Driving system Viewable Image Size Pixel pitch LCD Panel Video Separate Sync. Display Color Dot Clock Horizontal scan range Vertical scan range Optimal preset resolution Highest preset resolution Resolution Plug & Play Input Connector Input Video Signal Power Source Power Consumption Standby < 2W Connector Type Signal Cable Type Physical Dimensions & Weight: 15-pin Mini D-Sub Detachable R, G, B Analog interface H/V TTL 262K Colors 65.49 MHz 36.5 kHz - 57.75 KHz 50 Hz - 75 Hz 1280 x 720 (60 Hz) 1280 x 720 (60 Hz) VESA DDC2B D-Sub 15pin 731Fw TFT Color LCD 427mm diagoanl 0.291mm(H) x 0.291mm(V)

AOC 731FW

Analog: 0.7Vp-p(standard), 75 OHM, Positive 100~240VAC, 47~63Hz Active < 37W

Characteristics Height (with base)x Width x Depth 327.65mmx418mmx220mm Weight (monitor only) Weight (with packaging) Temperature: Operating Non-Operating Environmental Humidity: Operating Non-Operating Regulations CCC/cUL/FCC/CE/EPA 15% to 90% (non-condensing) 15% to 90% (non-condensing) 0to 40 -20 to 60 3.2 kg 4.7kg

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17" LCD Color Monitor 2. LCD Monitor Descriptionbrightness control logic and DDC.

AOC 731FW

The LCD monitor will contain a main board, power board and a key board which house the flat panel control logic,

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

CCFL Drive.

Flat Panel and CCFL backlight

Power board (Include: adapter, inverter)

Main Board

RS232 Connector For white balance adjustment in factory mode

Key board

AC-IN 100V-240V HOST Computer

Video signal, DDC

5

17" LCD Color Monitor 3. Operating Instructions3.1 General Instructions

AOC 731FW

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 Button

External Controls 1. 3. 5.Eco mode / Power Menu / Enter

2. 4.

DCR / + Auto / Exit

6

17" LCD Color Monitor3.3 Adjusting the Picture OSD Settings1) Press the MENU-button to activate the OSD window.

AOC 731FW

2) Press- or + to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate sub-menu . Once the desired function is highlighted, press MENU-button to activate it. 3) Press- or +to change the settings of the selected function. Press - or + to select another function in sub-menu . Press AUTO to exit . If you want to adjust any other function, repeat steps 2-3. 4) 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. 5) 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). 6)DCR hot key : Only to press DCR key continuously is able to active or disable DCR function when there is no OSD. 7)Auto configure hot key: When the OSD is closed, press Auto button will be auto configure hot key function .

OSD TABLE: 7

17" LCD Color Monitor

AOC 731FW

8

17" LCD Color Monitor

AOC 731FW

LED IndicatorsStatus Full Power Mode Active-off Mode LED Color Green or Blue Orange or red

9

17" LCD Color Monitor 4. Input/Output Specification4.1 Input Signal ConnectorPin No. 1. 2. 3. 4. 5. 6. 7. 8. Description Red Video Green Video Blue Video N.C Ground Red Ground Green Ground Blue Ground Pin No. 9. 10. 11. 12. 13. 14. 15. Description +5V Detect Cable N.C DDC-Serial Data H-Sync V-Sync DDC-Serial Clock

AOC 731FW

VGA connector layout

1 6 11

5 10 15

4.2 Factory Preset