Service Manuals, User Guides, Schematic Diagrams or docs for : AOC Monitor E2251FWH aoc_e2251fwh_lcd_monitor

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21.5" LCD Color Monitor                                                                                                      AOC E2251FWH

Service
Service
Service




                                                                                                                          Horizontal Frequency
                                                                                                                                      30kHz-83KHz
                                                               Table of Contents
Description                                                           Page       Description                                                   Page

Table of Contents.........................................................1      5.Block Diagram............................................24
Revision List................................................................2   6.Schematic.......................................................25
Important Safety Notice...............................................3          6.1.Main Board....................................................25
1.Monitor Specification.................................................4        6.2.Key Board......................................................31
2.LCD Monitor Description.......................................5                7.PCB Layout.....................................................32
3.Operation Instruction...............................................6          7.1.Main Board....................................................32
3.1.General Instructions.................................................6       7.2.Key Board....................................................32
3.2.Hot Keys......................................................6              8.Maintainability..................................................33
3.3.OSD Setting.......................................................7          8.1.Equipments and Tools Requirement...............33
4.Input/Output Specification.......................................19            8.2.Trouble Shooting.........................................34
4.1.Input Signal Connector.........................................19            9.White-Balance, Luminance Adjustment.............38
4.2.Factory Preset Display Modes...............................20                10.Monitor Exploded View.................................40
4.3.Panel Specification.............................................21           11.BOM List..................................................42




                                                                 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
                         Revision List

Version   Release Date      Revision History     L&T Model Name

                                               HIAJNZ2QB7A1CNF.LF
 A00      JUL-20-2012      Add new CKD model
                                               HIAJNZ2QB7A1CNF.PA




                                 2
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
1. Monitor Specifications




                            4
2. LCD Monitor Description
The LCD MONITOR will contain a main board and a key board which house the flat panel control logic, brightness
control logic and DDC.


                                             Monitor Block Diagram




                                             Flat Panel and
                          LED Drive.
                                             LED backlight




                                                                                        Key Board

                                           Main Board




                                            HDMI          DVI        D-SUB                 Audio
                         Adapter            Signal      Signal       Signal                  out



                                   AC-IN
                               100V~24




                                                             5
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.
By changing these settings, the picture can be adjusted to your personal preferences.

3.2 Hotkeys




      Power
Press the Power button to turn on/off the monitor.


      Menu/Enter

Press to display the OSD or confirm the selection

   Eco (DCR)/-
Press the Eco key continuously to select the Eco mode of brightness and DCR on when there is no OSD. (Eco

mode hot key may not be available in all models).

4:3 or wide image ratio /Volume >
When there is no OSD and VGA input only, press hotkey continuously to change 4:3 or wide image ratio.

(If the product screen size is 4:3 or input signal resolution is wide format, the hot key is disable to adjust

and also only available for VGA input )

when HDMI input, press hotkey continuously to activate Volume, and press the Up or Down to change

the setting, press Menu button for confirmation and exit OSD. this only available for HDMI input


        Source/Auto / Exit

When the OSD is closed, press Auto/Source/Exit button continuously about 2 second to do auto configure (only for

the models with dual or more inputs).

When the OSD is closed, press Auto/Source/Exit button will be Source hot key function (Only for the models with

dual or more inputs).



                                                                     6
3.3 OSD Setting
Basic and simple instruction on the control keys.




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 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        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.




Notes:
1) If the product has only one signal input, the item of "Input Select" is disable to adjust.
2) If the product screen size is 4:3 or input signal resolution is wide format, the item of "Image Ratio" is disable to
adjust.
3) One of DCR, Color Boost, and Picture Boost functions is active, the other two function is turned off accordingly.




                                                                    7
Luminance
1




Press        (Menu) to display menu

2




Press   or      to select       (Luminance), and press            to enter

3




Press   or       to select submenu, and press to         enter.




                                                              8
4




Press   or        to adjust
5




Press        to exit.




                              9
Image Setup
1




Press    (Menu) to display menu

2




Press   or    to select             (Image Setup) , and press   to enter.

3




Press   or    to select submenu, and press       to enter.

4




Press   or    to adjust.


                                                         10
5




Press         to exit.



                   Clock         0-100             Adjust picture Clock to reduce Vertical-Line noise.
                   Phase         0-100             Adjust Picture Phase to reduce Horizontal-Line noise
                   Sharpness     0-100             Adjust picture sharpness
                   H.Position    0-100             Adjust the horizontal position of the picture.
                   V.Position    0-100             Adjust the vertical position of the picture.


Color Setup
1




Press        (Menu) to display menu.

2




Press   or        to select            (Color Setup), and press      to enter.




                                                              11
3




Press   or      to select submenu, and press   to enter.

4




Press   or      to adjust.
5




Press        to exit.




                                                           12
                                Warm                                Recall Warm Color Temperature from EEPROM.
                                Normal                              Recall Normal Color Temperature from EEPROM.
                                Cool                                Recall Cool Color Temperature from EEPROM.
              Color setup.      sRGB                                Recall SRGB Color Temperature from EEPROM.
                                                   Red              Red Gain from Digital-register
                                User               Green            Green Gain Digital-register.
                                                   Blue             Blue Gain from Digital-register
                                Full
                                                   on or off        Disable or Enable Full Enhance Mode
                                Enhance
                                Nature Skin        on or off        Disable or Enable Nature Skin Mode
               DCB 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
              DCB Demo                             on or off        Disable or Enable Demo


Picture Boost
1




Press        (Menu) to display menu.

2




Press   or       to select             (Picture Boost), and press         to enter.




                                                               13
3




Press   or      to select submenu, and press      to enter.

4




Press   or      to adjust.
5




Press        to exit.



                Frame Size            14-100           Adjust Frame Size
                Brightness            0-100            Adjust Frame Brightness
                Contras               0-100            Adjust Frame Contrast
                H. position           0-100            Adjust Frame horizontal Position
                V.position           0-100             Adjust Frame vertical Position
                Bright Frame          on or off        Disable or Enable Bright Frame




                                                              14
OSD Setup
1




Press        (Menu) to display menu.

2




Press   or       to select             (OSD Setup), and press     to enter.

3




Press   or       to select submenu, and press        to enter.




                                                             15
4




Press   or      to adjust.
5




Press         to exit.



             H.Position          0-100   Adjust the horizontal position of OSD
             V.Position          0-100   Adjust the vertical position of OSD
             Timeout             5-120   Adjust the OSD Timeout
             Transparence        0-100   Adjust the transparence of OSD
             Language                    Select the OSD language


Extra
1




Press        (Menu) to display menu.




                                              16
2




Press   or      to select           (Extra), and press          to enter.
3




Press   or      to select submenu, and press        to enter.

4




Press   or      to adjust.
5




Press        to exit.



                                                            17
Exit
1




Press        (Menu) to display menu.

2




Press   or      to select              (Exit), and press   to exit.




                       Exit                                           Exit the main OSD




                                                           18
4. Input/Output Specification
4.1 D-SUB CONNECTORS                and   DVI CONNECTORS
Pin Assignments




Pin Number          15-Pin Side of the Signal Cable   Pin Number         15-Pin Side of the Signal Cable

         1          Video-Red                                   9        +5V
         2          Video-Green                              10          Ground

         3          Video-Blue                               11          N.C.
         4          N.C.                                     12          DDC- Serial data
         5          Detect Cable                             13          H- sync
         6          GND-R                                    14          V- sync
         7          GND-G                                    15          DDC- Serial clock
         8          GND-B




Pin Number   24-Pin Color Display Signal Cable        Pin Number    24-Pin Color Display Signal Cable

     1       TMDS data 2                                   13       TMDS data 3
     2       TMDS data 2                                   14       5V Power
     3       TMDS data 2/4 Shield                          15       Ground +5V 

     4       TMDS data 4                                   16       Hot Plug Detect

     5       TMDS data 4                                   17       TMDS data 0
     6       DDC Clock                                     18       TMDS data 0
     7       DDC data                                      19       TMDS data 0/5 Shield
     8       N.C.                                          20       TMDS data 5
     9       TMDS data 1                                   21       TMDS data 5
    10       TMDS data 1                                   22       TMDS Clock Shield
    11       TMDS data 1/3 Shield                          23       TMDS Clock +
    12       TMDS data 3                                   24       TMDS Clock




                                                      19
4.2 Factory Preset Display Modes




                                   20
4.3 Panel Specification
4.3.1 General Features
BM215WF4-TJC1 is a Color Active Matrix Liquid Crystal Display with an integral Light Emitting Diode (LED)
backlight system. The matrix employs a-Si Thin Film Transistor as the active element. It is a transmissive type
display operating in the normally white mode. It has a 21.5 inch diagonally measured active display area with Full
HD resolution (1080 vertical by 1920 horizontal pixel array) Each pixel is divided into Red, Green and Blue
sub-pixels or dots which are arranged in vertical stripes. Gray scale or the brightness of the sub-pixel color is
determined with

a 8-bit gray scale signal for each dot, thus, presenting a palette of more than 16,7M colors with
Advanced-FRC(Frame Rate Control). It has been designed to apply the interface method that enables low power,
high speed, low EMI. FPD Link or compatible must be used as a LVDS(Low Voltage Differential Signaling) chip. It is
intended to support applications where thin thickness, wide viewing angle, low power are critical factors and graphic
displays are important. In combination with the vertical arrangement of the sub-pixels, the BM215WF4-TJC1
characteristics provide an excellent flat panel display for office automation products such as monitors.

4.3.2 Display Characteristics




                                                            21
4.3.3 Electrical Characteristics
                                                              Values
Parameter                             Symbol                                                 Unit   Notes
                                                              Min          Typ        Max

MODULE :

Power Supply Input Voltage            VLCD                    4.5          5.0        5.5    Vdc

Permissive Power Input Ripple         VLCD                    -            -          0.3    V      3

                                      ILCD-MOSAIC(60Hz)       -            1000       1300   mA     1,5

Power Supply Input Current            ILCD-BLACK(60Hz)        -            1300       1690   mA     2,5

                                      ILCD-BLACK(75Hz)                     -          2000   mA     5

Power Consumption                     PLCD                    -            5.00       6.5    Watt   1

Inrush current                        IRUSH                   -            -          3.0    A      1, 4




LED bar Electrical characteristics

                                                          Values
Parameter                    Symbol      Condition                                           Unit   Notes
                                                          Min.         Typ.       Max.

LED :                                                                                               1,7

LED String Current           Is                           -            110        120        mA     2,7

LED String Voltage           Vs                           48.0         51.2       54.4       V      3,7

Power Consumption            PBar                         -            11.3       12.0       Watt   4,6,7

LED Life Time                LED_LT                       30,000       -          -          Hrs    5,7




                                                              22
4.3.4 Optical Characteristics
                                                       Ta=25 



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