AOC Service Manual-HP-LE1851w A00 Tutorials/HP...26.02.200918.5 LCD Color Monitor HP LE1851w 1 Service Service Service Horizontal Frequency 24- 83 kHz TABLE OF CONTENTS

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  • 18.5" LCD Color Monitor HP LE1851w

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    Service Service Service

    Horizontal Frequency 24- 83 kHz

    TABLE OF CONTENTS 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.

    CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

    Table Of Contents.............................................1

    Revision List...............................................2

    1. Monitor Specification......................................3

    2. LCD Monitor Description.......4

    3. Operation Instruction.........................5

    3.1. General Instructions......................................5

    3.2. Control Button..............................5

    3.3 Adjusting the Picture.................................... ..6

    4. Input/Output Specification.......................10

    4.1. Input Signal Connector............................10

    4.2. Factory Preset Display Modes........................10

    5. Panel Specification.......................11

    5.1. General Feature.......................11

    5.2. Optical Characteristics11

    5.3 Parameter guide line for CCFL Inverter..13

    6. Block Diagram...................................15

    6.1 Software Flow Chart...15

    6.2.Electrical Block Diagram.........17

    7. Schematic......................................19

    7.1 Main Board...........................................19

    7.2 Power Board......................................24

    7.3 Key Board..26

    8.PCB Layout.................................... ........ ..... ...27

    8.1. Main Board........................................27

    8.2. Power Board.......................................28

    8.3. Key Board...................................30

    9. Maintainability.......................................31

    9.1. Equipments and Tools Requirement..............31

    9.2. Trouble Shooting.............................32

    9.2.1 Main Board..............................32

    9.2.2 Power Board..............................34

    9.2.3 Key Board..............................36

    10 White-Balance, Luminance adjustment...37

    11.Mechanical Instructions............39

    12. Monitor Exploded View.............42

    13. BOM List..43

    14. Different Parts List...................................53

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    Revision List Version Date Revision History TPV Model Name

    T89MM5DBRWHPNNE

    T89MM5DBRWHPNCE

    T89SM5DBRWHPNNE Initial release

    T89SM5DBRWHPNCE

    M185B1-L02

    A00 Mar.-16-2009

    Panel List in Item 5 LTM185AT01 Q01 / Q02

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    1. Monitor Specification

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    2. LCD Monitor Description The LCD Monitor will contain main board, power board, 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.

    Video signal, DDC

    Power Board

    (Include adapter board)

    Flat Panel and

    CCFL backlight

    Main Board RS232 Connector

    For white balance

    adjustment in

    factory mode

    HOST Computer

    CCFT Drive.

    AC-IN

    110V-240V

    Monitor Block Diagram

    Keyboard

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    3. Operation Instructions 3.1 General Instructions The monitor settings can be adjusted from the On-Screen Display (OSD) menu. To access the OSD

    and adjust screen settings base on your viewing preference, do the following:

    1. If the monitor is not already on, press the power button to turn on the monitor. The power indicator

    will light up.

    2. To access the OSD menu, press the Menu button.

    3. To navigate through the Main Menu, press the or + buttons. Once the desired function is

    highlighted, press the Menu button to activate the Submenu. Press the Menu button to select the

    highlighted function.

    4. Press the or + button to change the settings of the selected function. Press the or + button to

    select another function in the Submenu.

    5. Press Auto/OK to select the highlighted function.

    3.2 Control Button

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    3.3 Adjust the Picture

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  • 18.5" LCD Color Monitor HP LE1851w

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  • 18.5" LCD Color Monitor HP LE1851w

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  • 18.5" LCD Color Monitor HP LE1851w

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    4. Input/Output Specification 4.1 Input Signal Connector

    4.1.1 D-SUB connector Pin Signal Pin Signal 1 Red Video 9 +5V Supply

    2 Green Video 10 Logic Ground

    3 Blue Video 11 NC

    4 NC 12 DDC-Serial Data

    5 DDC-Return 13 H-Sync.

    6 Red Ground 14 V-Sync.

    7 Green Ground 15 DDC-Serial Clock

    8 Blue Ground

    VGA connector layout

    PIN 1 PIN 5

    PIN 11

    4.2 Factory Preset Display Modes

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    5. Panel Specification 5.1 General Feature M185B1-L02

    LTM185AT01 Q01/Q02

    5.2 Optical Characteristics M185B1-L02

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    LTM185AT01 Q01/Q02

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    5.3 Parameter guide line for CCFL Inverter 1.TFT LCD Module:

    M185B1-L02

    LTM185AT01 Q01/Q02

    2. Back Light Unit:

    M185B1-L02

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    LTM185AT01 Q01/Q02

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    6. Block diagram 6. 1 Software Flow Chart

    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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    REMARK:

    1) MCU initialize.

    2) Is the EEprom blank?

    3) Program the EEprom by default values.

    4) Get the PWM value of brightness from EEprom.

    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 EEprom.

    Turn on the LED and set it to green color.

    Scalar initialize.

    10) In standby mode?

    11) Update the lifetime of back light.

    12) Check the analog port, are theyre 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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    6.2 Electrical Block Diagram 6.2.1 Scalar Board

    Scalar TSUM1PFR-LF

    (Include ADCOSDMCU)

    (U401)

    FLASH MEMORY

    PM25LV010A (U402)

    D-Sub Connector

    (CN101)

    EPR_SDA

    EPR SCL

    Panel Interface

    (CN403)

    EEPROM

    M24C02

    (U104)

    H sync

    V sync RGB

    EEPROM

    M24C04

    (U403)

    DB15_SDA,

    DB15 SCL

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    6.2.2 Inverter / Power Board

    CN902

    DIM

    EMI filter Bridge

    Rectifier

    and Filter

    Start Circuit

    PWM

    Control IC

    Transformer Rectifier

    diodes

    AC input

    12V

    ON/OFF

    Control PWM

    Control IC

    Feedback

    Circuit

    LC

    Resonance Transformer MOSFET

    Over

    Voltage

    Lamp

    ON/OFF

    Feedback

    Circuit Over

    Voltage

    Protect 5V

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    7. Schematic 7.1 Main Board

    05.Power

    on_BACKLIGHT

    BKLT_VBRI

    VCC1.8

    CMVCC

    VCC3.3