COLOR MONITOR SERVICE MANUAL - go-gddq. ?· COLOR MONITOR SERVICE MANUAL Website: ... (L204WT-BFQ.A**BQF)…

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  • COLOR MONITORSERVICE MANUAL

    Website:http://biz.LGservice.comE-mail:http://www.LGEservice.com/techsup.html

    CAUTIONBEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

    CHASSIS NO. : LM62B

    MODEL: L204WT(L204WT-SFQ.A**BQF)L204WT(L204WT-BFQ.A**BQF)

    ( ) **Same model for Service

    www.ma163.com

  • - 2 -

    CONTENTS

    SPECIFICATIONS ................................................... 2

    PRECAUTIONS ....................................................... 4

    TIMING CHART ....................................................... 8

    DISASSEMBLY ....................................................... 9

    BLOCK DIAGRAM ................................................. 10

    DESCRIPTION OF BLOCK DIAGRAM...................11

    ADJUSTMENT ...................................................... 13

    TROUBLESHOOTING GUIDE .............................. 15

    WIRING DIAGRAM ............................................... 19

    EXPLODED VIEW...................................................20

    REPLACEMENT PARTS LIST ...............................22

    SCHEMATIC DIAGRAM......................................... 24

    1. LCD CHARACTERISTICSType : TFT Color LCD ModuleActive Display Area : 20.1 inch diagonalPixel Pitch : 0.258 (H) x 0.258 (V)Size : 459.4(H) x 296.4(V) x 21.6(D)Color Depth : 16.2M(6bit + FRC) colorsElectrical Interface : LVDSSurface Treatment : Anti-Glare, Hard Coating(3H) Operating Mode : Normally WhiteBacklight Unit : 6 CCFL

    2. OPTICAL CHARACTERISTICS2-1. Viewing Angle by Contrast Ratio 10

    Left : +80 min., +85(Typ) Right : -80 min., -85(Typ)Top :+80 min., +85(Typ) Bottom : -80 min., -85(Typ)

    2-2. Luminance : 180(Typ) (Typ. 30)-sRGB: 230(min), 300(Typ)-6500K: 150(min)-9300K

    2-3. Contrast Ratio : 500(min), 600(Typ)DFC -> 2000 : 1 (Typ)

    3. SIGNAL (Refer to the Timing Chart)3-1. Sync Signal

    Type : Separate Sync, SOG, Digital

    3-2. Video Input Signal1) Type : R, G, B Analog2) Voltage Level : 0~0.7 V3) Input Impedance : 75

    3-3. Operating FrequencyHorizontal : 30 ~ 83kHzVertical : 56 ~ 75Hz

    4. MAX. RESOLUTIONAnalog : 1680 x 1050@60HzDigital : 1680 x 1050@60Hz

    5. POWER SUPPLY5-1. Power Adaptor(Built-in Power)

    Input : AC 100-240V~, 50/60Hz, 1.2A

    5-2. Power Consumption

    6. ENVIRONMENT

    6-1. Operating Temperature : 10C~35C (50F~95F)6-2. Relative Humidity : 10%~80% (Non-condensing)6-3. MTBF : 50,000 HRS with 90%

    Confidence levelLamp Life : 40,000 Hours (Min)

    7. DIMENSIONS (with TILT/SWIVEL)

    Width : 466.2 mm (18.35'')Depth : 226 mm (8.90'')Height : 384 mm (15.12'')

    8. WEIGHT (with TILT/SWIVEL)

    Net. Weight : 4.8 kg (10.58 lbs)Gross Weight : 5.8 kg (12.79 lbs)

    SPECIFICATIONS

    MODE

    POWER ON (NORMAL)

    STAND BY

    SUSPEND

    DPMS OFF

    POWER S/W OFF

    H/V SYNC

    ON/ON

    OFF/ON

    ON/OFF

    OFF/OFF

    -

    POWER CONSUMPTION

    less than 50 W(max)

    less than 45 W(typ)

    less than 1 W

    less than 1 W

    less than 1 W

    less than 1 W

    LED COLOR

    BLUE

    AMBER

    AMBER

    AMBER

    OFF

    VIDEO

    ACTIVE

    OFF

    OFF

    OFF

    -

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  • - 3 -

    Signal Connector Pin Assignment

    Pin Signal (DVI-D)123456789101112131415

    T. M. D. S. Data2-T. M. D. S. Data2+T. M. D. S. Data2/4 ShieldT. M. D. S. Data4-T. M. D. S. Data4+DDC ClockDDC DataAnalog Vertical Sync.T. M. D. S. Data1-T. M. D. S. Data1+T. M. D. S. Data1/3 ShieldT. M. D. S. Data3-T. M. D. S. Data3++5V PowerGround (return for +5V, H. Sync. and V. Sync.)

    Pin Signal (DVI-D)

    1 89

    17 2416

    161718192021222324

    Hot Plug DetectT. M. D. S. Data0-T. M. D. S. Data0+T. M. D. S. Data0/5 ShieldT. M. D. S. Data5-T. M. D. S. Data5+T. M. D. S. Clock ShieldT. M. D. S. Clock+T. M. D. S. Clock-

    T. M. D. S. (Transition Minimized Differential Signaling)

    DVI-D Connector (Digital)

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  • - 4 -

    WARNING FOR THE SAFETY-RELATED COMPONENT.

    There are some special components used in LCDmonitor that are important for safety. These parts aremarked on the schematic diagram and thereplacement parts list. It is essential that these criticalparts should be replaced with the manufacturersspecified parts to prevent electric shock, fire or otherhazard.

    Do not modify original design without obtaining writtenpermission from manufacturer or you will void theoriginal parts and labor guarantee.

    TAKE CARE DURING HANDLING THE LCD MODULEWITH BACKLIGHT UNIT.

    Must mount the module using mounting holes arrangedin four corners.

    Do not press on the panel, edge of the frame stronglyor electric shock as this will result in damage to thescreen.

    Do not scratch or press on the panel with any sharpobjects, such as pencil or pen as this may result indamage to the panel.

    Protect the module from the ESD as it may damage theelectronic circuit (C-MOS).

    Make certain that treatment person s body aregrounded through wrist band.

    Do not leave the module in high temperature and inareas of high humidity for a long time.

    The module not be exposed to the direct sunlight.

    Avoid contact with water as it may a short circuit withinthe module.

    If the surface of panel become dirty, please wipe it offwith a softmaterial. (Cleaning with a dirty or rough clothmay damage the panel.)

    WARNING

    BE CAREFUL ELECTRIC SHOCK !

    If you want to replace with the new backlight (CCFL) orinverter circuit, must disconnect the AC adapterbecause high voltage appears at inverter circuit about650Vrms.

    Handle with care wires or connectors of the invertercircuit. If the wires are pressed cause short and mayburn or take fire.

    Leakage Current Hot Check Circuit

    PRECAUTION

    CAUTIONPlease use only a plastic screwdriver to protect yourselffrom shock hazard during service operation.

    1.5 Kohm/10W

    To Instrument'sexposed METALLIC PARTS

    Good Earth Groundsuch as WATER PIPE,CONDUIT etc.

    AC Volt-meter

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  • - 5 -

    SERVICING PRECAUTIONSCAUTION: Before servicing receivers covered by thisservice manual and its supplements and addenda, readand follow the SAFETY PRECAUTIONS on page 3 of thispublication.NOTE: If unforeseen circumstances create conflictbetween the following servicing precautions and any of thesafety precautions on page 3 of this publication, alwaysfollow the safety precautions. Remember: Safety First.

    General Servicing Precautions1. Always unplug the receiver AC power cord from the AC

    power source before;a. Removing or reinstalling any component, circuit

    board module or any other receiver assembly.b. Disconnecting or reconnecting any receiver electrical

    plug or other electrical connection.c. Connecting a test substitute in parallel with an

    electrolytic capacitor in the receiver.CAUTION: A wrong part substitution or incorrectpolarity installation of electrolytic capacitors mayresult in an explosion hazard.

    d. Discharging the picture tube anode.2. Test high voltage only by measuring it with an

    appropriate high voltage meter or other voltagemeasuring device (DVM, FETVOM, etc) equipped witha suitable high voltage probe.Do not test high voltage by "drawing an arc".

    3. Discharge the picture tube anode only by (a) firstconnecting one end of an insulated clip lead to thedegaussing or kine aquadag grounding system shieldat the point where the picture tube socket ground leadis connected, and then (b) touch the other end of theinsulated clip lead to the picture tube anode button,using an insulating handle to avoid personal contactwith high voltage.

    4. Do not spray chemicals on or near this receiver or anyof its assemblies.

    5. Unless specified otherwise in this service manual,clean electrical contacts only by applying the followingmixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive applicator;10% (by volume) Acetone and 90% (by volume)isopropyl alcohol (90%-99% strength)CAUTION: This is a flammable mixture.Unless specified otherwise in this service manual,lubrication of contacts in not required.

    6. Do not defeat any plug/socket B+ voltage interlockswith which receivers covered by this service manualmight be equipped.

    7. Do not apply AC power to this instrument and/or any ofits electrical assemblies unless all solid-state deviceheat sinks are correctly installed.

    8. Always connect the test receiver ground lead to thereceiver chassis ground before connecting the testreceiver positive lead.Always remove the test receiver ground lead last.

    9. Use with this receiver only the test fixtures specified inthis service manual.CAUTION: Do not connect the test fixture ground strapto any heat sink in this receiver.

    Electrostatically Sensitive (ES) DevicesSome semiconductor (solid-state) devices can bedamaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive (ES)Devices. Examples of typical ES devices are integratedcircuits and some field-effect transistors andsemiconductor "chip" components. The followingtechniques should be used to help reduce the incidence ofcomponent damage caused by static by static electricity.1. Immediately before handling any semiconductor

    component or semiconductor-equipped assembly, drainoff any electrostatic charge on your body by touching aknown earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap device,which should be removed to prevent potential shockreasons prior to applying power to the unit under test.

    2. After removing an electrical assembly equipped withES devices, place th