Lg Flatron w1941s Sm

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    E-mail: http://www.LGEservice.com/techsup.html

    COLOR MONITOR SERVICE MANUAL MODEL: W1941S (****************) **Sales Market

    CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

    *To apply the MSTAR Chip.

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    CONTENTS SPECIFICATIONS ...................................................2 PRECAUTIONS .......................................................3 TIMING CHART .......................................................7 DISASSEMBLY ........................................................8 BLOCK DIAGRAM...................................................11 DISCRIPTION OF BLOCK DIAGRAM .................. 13 ADJUSTMENT ...................................................... 15

    SERVICE MODE ......................................................... 17 TROUBLESHOOTING GUIDE .............................. 18 WIRING DIAGRAM ................................................... 24 EXPLODED VIEW...................................................... 25 REPLACEMENT PARTS LIST ................................. 27 SCHEMATIC DIAGRAM......................................... 35

    SPECIFICATIONS

    1. LCD CHARACTERISTICS Type : TFT Color LCD Module Active Display Area : 18.51 inch Pixel Pitch : 0.3 (H) x 0.3 (V)mm Color Depth : 16.7M colors Size : 430.4(H) x 254.6(V) x 13.0(D) mm(Typ.) Interface : LVDS 2Port Surface Treatment : Hard-coating(3H), Anti-Glare Operating Mode : Normally White, Transmissive mode Backlight unit: 2 CCFL 2. OPTICAL CHARACTERISTICS 2-1. Viewing Angle by Contrast Ratio > 10 Left : 70min, 85(Typ) Right : 70min, 85(Typ) Top :60 min, 75(Typ) Bottom : 70min,85(Typ) 2-2.Luminance :250Cd / m2 (min), 300Cd / m2 (Typ) -6500K

    :170Cd / m2 (min) -9300K 2-3. Contrast Ratio : 600(min), 1000(Typ) 3. SIGNAL (Refer to the Timing Chart) 3-1. Sync Signal Type : Separate Sync, SOG (Sync On Green) 3-2. Video Input Signal 1) Type : R, G, B Analog 2) Voltage Level : 0~0.7 Vp-p 3) Input impedance: 75 3-3. Operating Frequency Horizontal : 30 ~ 61kHz Vertical : 56 ~ 75Hz

    4. Max. Resolution D-sub Analog : VESA 1360 x 768 @ 60 Hz 5. POWER SUPPLY 5-1. Power : AC 100-240V~ 50/60Hz 0.8A 5-2. Power Consumption On Mode : 21 W(Typ.) Sleep Mode: 1 W Off Mode : 1 W 6. ENVIRONMENT 6-1. Operating Temperature : 10C~35C Humidity: 10 % to 80 % non-Condensing 6-2. Storage Temperature: -20C to 60 C Humidity: 5 % to 90 % non-Condensing 6-3. MTBF : 70000 Hours (Not include panel) Lamp Life : Depend on Module spec 7. DIMENSIONS (with Stand) Width : 44.84 cm (17.65 inches) Depth : 35.79 cm (14.09 inches) Height : 19.84 cm (7.81 inches) 8. WEIGHT (excl. packing) Weight : 3.3 kg (7.28 lbs)

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    TIMING CHART

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    DISASSEMBLY-Set #1

    Put the monitor on a soft flat.

    #2

    Pull out the stand and the hinge cover.

    #3

    Remove the three screws.

    #4

    Put the front cover upward. Then let the all latches are separated.

    #5

    Put the front face down, disassembly back cover.

    #6

    Pull the key board out of bezel.

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    #7

    Disassembly the bezel.

    8

    Disassembly the connector and screw.

    #9

    Remove the screw.

    #10

    Disassemble the FFC cable.

    #11

    Main board and power board.

    #12

    The panel.

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    DISASSEMBLY-Stand #1

    Pull the Base Latches to inside until losing elasticity.

    #2

    Consequently, pull the stand body directly.

    #3

    Separate Stand Body & Stand Base.

    #4

    Fix Stand Base & Stand Body.

    #5

    Separate the hinge and stand.

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    BLOCK DIAGRAM

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    BLOCK DIAGRAM-POWER Power

    Inverter

    EMI filter Rectification Transformer

    5V/12V output OVP

    Feedback control circuit

    Switching circuit (PWM control IC & MOSFER)

    OVP protect circuit

    Diode rectifier

    Starting resistor

    12V

    Rush prevention

    ON/OFF

    DIM

    Push-pull circuit

    Transformer conversion

    LC resonance

    VDDA

    ON/OFF circuit

    PWM IC OZ9938GN

    Feedback circuit

    OVP circuit 2 CCFL lamps

    Sampling Lamp open protection

    DIM circuit

    12V

    5V 100~240V

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    DESCRIPTION OF BLOCK DIAGRAM

    1. Video Controller Part.

    This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to

    the digital video signal using a pixel clock.

    The pixel clock for each mode is generated by the PLL.

    The range of the pixel clock is from 79.5MHz to 90MHz.

    This part consists of the Scaler, ADC converter, TMDS receiver and LVDS transmitter.

    The Scaler gets the video signal converted analog to digital, interpolates input to 1360 X 768 resolution signal and

    outputs 8-bit R, G, B signal to transmitter.

    2. Power Part.

    This part consists of the one 3.3V, and one 1.8V regulators to convert power which is provided 5V in Power board.

    12V is provided for inverter, 5V is provided for LCD panel.

    Also, 5V is converted 3.3V and 1.8V by regulator. Converted power is provided for IC in the main board.

    The inverter converts from DC 12V to AC 700Vrms and operates back-light lamps of module.

    3. MICOM Part.

    This part is including video controller part. And this part consists of NVRAM which stores control data, Reset IC and

    the Micom.

    The Micom distinguishes polarity and frequencies of the H/V sync are supplied from signal cable.

    The controlled data of each mode is stored in NVRAM.

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    LIPS Board Block Diagram

    Operation description_LIPS

    1. EMI components.

    This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the

    circuit included a line-filter, across line capacitor and of course the primary protection fuse.

    2. Input rectifier and filter.

    This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.

    3. Energy Transfer.

    This part function is for transfer the primary energy to secondary through a power transformer.

    4. Output rectifier and filter.

    This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to

    adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized, and

    also the over power protection is also monitor by this part.

    5. Photo-Coupler isolation.

    This part function is to feed back the DC output changing status through a photo transistor to primary controller to

    achieve the stabilized DC output voltage.

    6. Signal collection.

    This part function is to collect the any change from the DC output and feed back to the primary through photo

    transistor.

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    ADJUSTMENT

    Windows EDID V1.0 User Manual

    Operating System: DOS, windows98, 2000, XP

    1. Parallel port setting

    Enter your bios, and do as followings.

    a) Integrated peripheral

    b) Super IO Device

    c) Parallel port mode

    you should set the parallel port mode to SPP for using the DOS EDID tool surely.

    2. EDID Write

    1Connect the signal line of monitor with DDC recorder. 2Choose the DDC RECORD program, and it shows on the screen, the choose the correct source base on the monitor. 3Click LoadFile ,then key in the manufacturer namemodel nameproduct code, then choose the correct model name base on the monitor.(as Fig. 2) 4Scan serial No. to DDC recorder by Bar Reader, then read again in the Verify SN. 5According to the message of DDC program, when the picture as fig.1 appears, it show DDC record has finished.

    Fig.1

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    Please check Manufacturer NameVendor Assigned Code Monitor Name Serial Number*****[????????******] (it must be the same as Bar Code) Week of Manufacture**Year of Manufacture****Checksum** (It must be the same as the last byte of data table, as follows picture shows). Above of all must be right, then if it shows the green PASS, it means record succeeds ,the red Fail means record fails; then check the power supply and signal line, and ensure they are connected well ,then do DDC record again from the third step.

    Fig.2

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