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  • LCD TVSERVICE MANUAL

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

    CHASSIS : LP81G

    MODEL : 32LG80FR 32LG80FR-TA

    North/Latin America http://aic.lgservice.comEurope/Africa http://eic.lgservice.comAsia/Oceania http://biz.lgservice.com

    Internal Use Only

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    CONTENTS

    CONTENTS .............................................................................................. 2

    SAFETY PRECAUTIONS ..........................................................................3

    SPECIFICATION ........................................................................................6

    ADJUSTMENT INSTRUCTION .................................................................9

    TROUBLE SHOOTING ............................................................................14

    BLOCK DIAGRAM...................................................................................19

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

    SVC. SHEET ...............................................................................................

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    SAFETY PRECAUTIONS

    Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in theSchematic Diagram and Exploded View.It is essential that these special safety parts should be replaced with the same components as recommended in this manual to preventShock, Fire, or other Hazards.Do not modify the original design without permission of manufacturer.

    General Guidance

    An isolation Transformer should always be used during theservicing of a receiver whose chassis is not isolated from the ACpower line. Use a transformer of adequate power rating as thisprotects the technician from accidents resulting in personal injuryfrom electrical shocks.

    It will also protect the receiver and it's components from beingdamaged by accidental shorts of the circuitry that may beinadvertently introduced during the service operation.

    If any fuse (or Fusible Resistor) in this TV receiver is blown,replace it with the specified.

    When replacing a high wattage resistor (Oxide Metal Film Resistor,over 1W), keep the resistor 10mm away from PCB.

    Keep wires away from high voltage or high temperature parts.

    Before returning the receiver to the customer,

    always perform an AC leakage current check on the exposedmetallic parts of the cabinet, such as antennas, terminals, etc., tobe sure the set is safe to operate without damage of electricalshock.

    Leakage Current Cold Check(Antenna Cold Check)With the instrument AC plug removed from AC source, connect anelectrical jumper across the two AC plug prongs. Place the ACswitch in the on position, connect one lead of ohm-meter to the ACplug prongs tied together and touch other ohm-meter lead in turn toeach exposed metallic parts such as antenna terminals, phonejacks, etc. If the exposed metallic part has a return path to the chassis, themeasured resistance should be between 1M and 5.2M. When the exposed metal has no return path to the chassis thereading must be infinite.An other abnormality exists that must be corrected before thereceiver is returned to the customer.

    Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet.

    Do not use a line Isolation Transformer during this check.Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitorbetween a known good earth ground (Water Pipe, Conduit, etc.)and the exposed metallic parts.Measure the AC voltage across the resistor using AC voltmeterwith 1000 ohms/volt or more sensitivity.Reverse plug the AC cord into the AC outlet and repeat AC voltagemeasurements for each exposed metallic part. Any voltagemeasured must not exceed 0.75 volt RMS which is corresponds to0.5mA.In case any measurement is out of the limits specified, there ispossibility of shock hazard and the set must be checked andrepaired before it is returned to the customer.

    Leakage Current Hot Check circuit

    1.5 Kohm/10W

    To Instrument'sexposed METALLIC PARTS

    Good Earth Groundsuch as WATER PIPE,CONDUIT etc.

    AC Volt-meter

    IMPORTANT SAFETY NOTICE

    0.15uF

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    CAUTION: Before servicing receivers covered by this servicemanual and its supplements and addenda, read and follow theSAFETY PRECAUTIONS on page 3 of this publication.NOTE: If unforeseen circumstances create conflict between thefollowing servicing precautions and any of the safety precautions onpage 3 of this publication, always follow 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 incorrect polarityinstallation of electrolytic capacitors may result in anexplosion hazard.

    2. Test high voltage only by measuring it with an appropriate highvoltage meter or other voltage measuring device (DVM,FETVOM, etc) equipped with a suitable high voltage probe.Do not test high voltage by "drawing an arc".

    3. Do not spray chemicals on or near this receiver or any of itsassemblies.

    4. Unless specified otherwise in this service manual, cleanelectrical contacts only by applying the following mixture to thecontacts with a pipe cleaner, cotton-tipped stick or comparablenon-abrasive applicator; 10% (by volume) Acetone and 90% (byvolume) isopropyl alcohol (90%-99% strength)CAUTION: This is a flammable mixture.Unless specified otherwise in this service manual, lubrication ofcontacts in not required.

    5. Do not defeat any plug/socket B+ voltage interlocks with whichreceivers covered by this service manual might be equipped.

    6. Do not apply AC power to this instrument and/or any of itselectrical assemblies unless all solid-state device heat sinks arecorrectly installed.

    7. Always connect the test receiver ground lead to the receiverchassis ground before connecting the test receiver positivelead.Always remove the test receiver ground lead last.

    8. Use with this receiver only the test fixtures specified in thisservice manual.CAUTION: Do not connect the test fixture ground strap to anyheat sink in this receiver.

    Electrostatically Sensitive (ES) DevicesSome semiconductor (solid-state) devices can be damaged easilyby static electricity. Such components commonly are calledElectrostatically Sensitive (ES) Devices. Examples of typical ESdevices are integrated circuits and some field-effect transistors andsemiconductor "chip" components. The following techniquesshould be used to help reduce the incidence of componentdamage caused by static by static electricity.1. Immediately before handling any semiconductor component or

    semiconductor-equipped assembly, drain off any electrostaticcharge on your body by touching a known earth ground.Alternatively, obtain and wear a commercially availabledischarging wrist strap device, which should be removed toprevent potential shock reasons prior to applying power to the

    unit under test.2. After removing an electrical assembly equipped with ES

    devices, place the assembly on a conductive surface such asaluminum foil, to prevent electrostatic charge buildup orexposure of the assembly.

    3. Use only a grounded-tip soldering iron to solder or unsolder ESdevices.

    4. Use only an anti-static type solder removal device. Some solderremoval devices not classified as "anti-static" can generateelectrical charges sufficient to damage ES devices.

    5. Do not use freon-propelled chemicals. These can generateelectrical charges sufficient to damage ES devices.

    6. Do not remove a replacement ES device from its protectivepackage until immediately before you are ready to install it.(Most replacement ES devices are packaged with leadselectrically shorted together by conductive foam, aluminum foilor comparable conductive material).

    7. Immediately before removing the protective material from theleads of a replacement ES device, touch the protective materialto the chassis or circuit assembly into which the device will beinstalled.CAUTION: Be sure no power is applied to the chassis or circuit,and observe all other safety precautions.

    8. Minimize bodily motions when handling unpackagedreplacement ES devices. (Otherwise harmless motion such asthe brushing together of your clothes fabric or the lifting of yourfoot from a carpeted floor can generate static electricitysufficient to damage an ES device.)

    General Soldering Guidelines1. Use a grounded-tip, low-wattage soldering iron and appropriate

    tip size and shape that will maintain tip temperature within therange or 500F to 600F.

    2. Use an appropriate gauge of RMA resin-core solder composedof 60 parts tin/40 parts lead.

    3. Keep the soldering iron tip clean and well tinned.4. Thoroughly clean the surfaces to be soldered. Use a mall wire-

    bristle (0.5 inch, or 1.25cm) brush with a metal handle.Do not use freon-propelled spray-on cleaners.

    5. Use the following unsoldering techniquea. Allow the soldering iron tip to reach normal temperature.

    (500F to 600F)b. Heat the component lead until the solder melts.c. Quickly draw the melted solder with an anti-static, suction-

    type solder removal device or with solder braid.CAUTION: Work quickly to avoid overheating the circuitboard printed foil.

    6. Use the following soldering technique.a. Allow the soldering iron tip to reach a normal temperature

    (500F to 600F)b. First, hold the soldering iron tip and solder the strand against

    the component lead until the solder melts.c. Quickly move the soldering iron tip to the junction of the

    component lead and the printed circuit foil, and hold it thereonly until the solder flows onto and around both thecomponent lead and the foil.CAUTION: Work quickly to avoid overheating the circuitboard printed foil.

    d. Closely inspect the solder area and remove any excess orsplashed solder with a small wire-bristle brush.

    SERVICING PRECAUTIONS

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    IC Remove/ReplacementSome chassis circuit boards have slotted holes (oblong) throughwhich the IC leads are inserted and then bent flat against thecircuit foil. When holes are the slotted type, the following techniqueshould be used to remove and replace the IC. When working withboards using the familiar round hole, use the standard techniqueas outlined in paragraphs 5 and 6 above.

    Removal1. Desolder and straighten each IC lead in one operation by gently

    prying up on the lead with the soldering iron tip as the soldermelts.

    2. Draw away the melted solder with an anti-static suction-typesolder removal device (or with solder braid) before removing theIC.

    Replacement1. Carefully insert the replacement IC in the circuit board.2. Carefully bend each IC lead against the circuit foil pad and

    solder it.3. Clean the soldered areas with a small wire-bristle brush.

    (It is not necessary to reapply acrylic coating to the areas).

    "Small-Signal" Discrete TransistorRemoval/Replacement1. Remove the defective transistor by clipping its leads as close as

    possible to the component body.2. Bend into a "U" shape the end of each of three leads remaining

    on the circuit board.3. Bend into a "U" shape the replacement transistor leads.4. Connect the replacement transistor leads to the corresponding

    leads extending from the circuit board and crimp the "U" withlong nose pliers to insure metal to metal contact then soldereach connection.

    Power Output, Transistor DeviceRemoval/Replacement1. Heat and remove all solder from around the transistor leads.2. Remove the heat sink mounting screw (if so equipped).3. Carefully remove the transistor from the heat sink of the circuit

    board.4. Insert new transistor in the circuit board.5. Solder each transistor lead, and clip off excess lead.6. Replace heat sink.

    Diode Removal/Replacement1. Remove defective diode by clipping its leads as close as

    possible to diode body.2. Bend the two remaining leads perpendicular y to the circuit

    board.3. Observing diode polarity, wrap each lead of the new diode

    around the corresponding lead on the circuit board.4. Securely crimp each connection and solder it.5. Inspect (on the circuit board copper side) the solder joints of

    the two "original" leads. If they are not shiny, reheat them and ifnecessary, apply additional solder.

    Fuse and Conventional ResistorRemoval/Replacement1. Clip each fuse or resistor lead at top of the circuit board hollow

    stake.2. Securely crimp the leads of replacement component around

    notch at stake top.3. Solder the connections.

    CAUTION: Maintain original spacing between the replacedcomponent and adjacent components and the circuit board toprevent excessive component temperatures.

    Circuit Board Foil RepairExcessive heat applied to the copper foil of any printed circuitboard will weaken the adhesive that bonds the foil to the circuitboard causing the foil to separate from or "lift-off" the board. Thefollowing guidelines and procedures should be followed wheneverthis condition is encountered.

    At IC ConnectionsTo repair a defective copper pattern at IC connections use thefollowing procedure to install a jumper wire on the copper patternside of the circuit board. (Use this technique only on ICconnections).

    1. Carefully remove the damaged copper pattern with a sharpknife. (Remove only as much copper as absolutely necessary).

    2. carefully scratch away the solder resist and acrylic coating (ifused) from the end of the remaining copper pattern.

    3. Bend a small "U" in one end of a small gauge jumper wire andcarefully crimp it around the IC pin. Solder the IC connection.

    4. Route the jumper wire along the path of the out-away copperpattern and let it overlap the previously scraped end of the goodcopper pattern. Solder the overlapped area and clip off anyexcess jumper wire.

    At Other ConnectionsUse the following technique to repair the defective copper patternat connections other than IC Pins. This technique involves theinstallation of a jumper wire on the component side of the circuitboard.

    1. Remove the defective copper pattern with a sharp knife.Remove at least 1/4 inch of copper, to ensure that a hazardouscondition will not exist if the jumper wire opens.

    2. Trace along the copper pattern from both sides of the patternbreak and locate the nearest component that is directlyconnected to the affected copper pattern.

    3. Connect insulated 20-gauge jumper wire from the lead of thenearest component on one side of the pattern break to the leadof the nearest component on the other side.Carefully crimp and solder the connections.CAUTION: Be sure the insulated jumper wire is dressed so theit does not touch components or sharp edges.

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    1. Application rangeThis specification is applied to LP81G chassis.

    2. Requirement for TestEach part is tested as below without special appointment.

    (1) Temperature : 25 5C(77 9F), CST : 40 5C(2) Humidity : 65% 10%(3) Power : Standard input voltage (100-240V~, 50/60Hz)

    * Standard Voltage of each products is marked by models.(4) Specification and performance of each parts are followed

    each drawing and specif ication by part number inaccordance with BOM.

    (5) The receiver must be operated for about 20 minutes priorto the adjustment.

    3. Test method(1) Performance : LGE TV test method followed(2) Demanded other specification

    Safety : CE, IEC SpecificationEMC : CE, IEC

    SPECIFICATIONNOTE : Specifications and others are subject to change without notice for improvement.

    4. Module SpecificationItem Specification Measurement Result Remark

    Display Screen Device 32 wide Color Display Module Resolution : 1920 X 1080Aspect Ratio 16:9LCD Module 32 TFT WUXGA LCD 32 FHD MAKER : LPLOperating Environment 1) Temp. : 0 ~ 40 deg LGE SPEC

    2) Humidity : 0 ~ 85%Storage Environment 1) Temp. : -20 ~ 60 deg

    2) Humidity : 0 ~ 85 %Input Voltage 100-240V~, 50/60HzPower Consumption Power on (Blue) : LG80 Volume: 1/8 volume of sound distortion point

    (32 FHD)St-By (Red) 1.0 W (All)

    LCD Module Maker Inch (H) x (V) x (D) unit Remark(Maker : AUO, LPL) LPL(FHD) Outline Dimension 32 [with inverter]

    Pixel Pitch 32Back Light 32

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    5. Model Specification(NON EU)Remark

    China(DK) Australia(BG)VHF/UHF C1~C62 C1~C75

    CATV S1~S41 S2~S44

    Rear 1EA, Side 1EA

    Rear

    Side (S-Video Priority)Rear

    Rear

    LG80

    L/R Input

    Side(1EA)

    Specification

    NON EU/ CHINA

    PAL SECAM B/G/D/K, PAL I/II, NTSC-M

    BAND PAL NTSC

    VHF/UHF E2~C69 2~78

    CATV S1~S47 1~71

    Upper Heterodyne

    PAL, SECAM, NTSC

    PAL, SECAM, NTSC

    PAL, SECAM, NTSC

    Y/Cb/Cr, Y/ Pb/Pr

    RGB-PC, S/W Upgrade

    HDMI-DTV, Only PCM MODE

    PC Audio, Component (2EA), AV (2EA)Divx, MP3, JPEG

    Item

    Market

    Broadcasting system

    Available Channel

    Receiving system

    Video Input (2EA)AV Output (1EA)S-Video Input (1EA)Component Input (2EA)RGB Input (1EA)HDMI Input (2EA)Audio Input (5EA)USB Input

    6. Component Video Input (Y, PB, PR)Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed

    720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz720*480 31.47 59.94 27.000 SDTV 480P

    720*480 31.50 60.00 27.027 SDTV 480P

    720*576 31.25 50.00 27.000 SDTV 576P 50Hz

    1280*720 44.96 59.94 74.176 HDTV 720P

    1280*720 45.00 60.00 74.250 HDTV 720P

    1280*720 37.50 50.00 74.25 HDTV 720P 50Hz

    1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,

    1920*1080 33.72 59.94 74.176 HDTV 1080I

    1920*1080 33.75 60.00 74.25 HDTV 1080I

    1920*1080 56.25 50 148.5 HDTV 1080P

    1920*1080 67.432 59.94 148.350 HDTV 1080P

    1920*1080 67.5 60.00 148.5 HDTV 1080P

  • Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark640*350 31.468 70.80 25.17 EGA

    720*400 31.469 70.08 28.32 DOS

    640*480 31.469 59.94 25.17 VESA(VGA)800*600 37.879 60.31 40 VESA(SVGA)

    1024*768 48.363 60 65 VESA(XGA)1280*768 47.776 59.87 79.5 VESA(WXGA)1360*768 47.72 59.799 84.75 VESA(WXGA)1366*768 47.7 60 84.62 WXGA

    1280*1024 63.668 59.895 109.00 SXGA Only FHD

    1920*1080 66.587 59.934 138.50 WUXGA(Reduced Blanking) Only FHD

    Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark720x400 31.468 70.08 28.32

    640x480 31.469 59.94 25.17 VESA(VGA)800x600 37.879 60.31 40.00 VESA(SVGA)

    1024x768 48.363 60.00 65.00 VESA(XGA)1280x768 47.776 59.87 79.5 VESA(WXGA)1360x768 47.72 59.799 84.62 VESA(WXGA)1366x768 47.7 60 84.62 WXGA

    1280x1024 63.595 60.0 108.875 SXGA Only FHD

    1920x1080 66.647 59.988 138.625 WUXGA Only FHD

    LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 8 -

    8. HDMI input (PC)- Spec. out but display correctly at only HDMI/DVI IN 1 via DVI to HDMI Cable

    Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remark720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I) Spec. out but display720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I) Spec. out but display720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz720*480 31.47 59.94 27 SDTV 480P

    720*480 31.5 60 27.027 SDTV 480P

    720*576 31.25 50 27 SDTV 576P

    1280*720 44.96 59.94 74.176 HDTV 720P

    1280*720 45 60 74.25 HDTV 720P

    1280*720 37.5 50 74.25 HDTV 720P

    1920*1080 28.125 50 74.25 HDTV 1080I

    1920*1080 33.72 59.94 74.176 HDTV 1080I

    1920*1080 33.75 60 74.25 HDTV 1080I

    1920*1080 56.25 50 148.5 HDTV 1080P

    1920*1080 67.432 59.94 148.350 HDTV 1080P

    1920*1080 67.5 60.00 148.5 HDTV 1080P

    1920*1080 27 24 74.25 HDTV 1080P

    1920*1080 33.75 30 74.25 HDTV 1080P

    9. HDMI input (DTV)

    7. RGB Input (Analog PC, DTV-NOT SUPPORT)

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 9 -

    ADJUSTMENT INSTRUCTION1. Application Range

    This spec. sheet is applied all of the 32 LCD TV, LP81Gchassis (HURRICANE 5-Modified) by manufacturing LG TVPlant all over the world.

    2. Specification1) Because this is not a hot chassis, it is not necessary to use

    an isolation transformer. However, the use of isolationtransformer will help protect test instrument.

    2) Adjustment must be done in the correct order.3) The adjustment must be performed in the circumstance of

    255C of temperature and 6510% of relative humidity ifthere is no specific designation.

    4) The input voltage of the receiver must keep 100-220V,50/60Hz.

    5) Before adjustment, execute Heat-Run for 15 minutes at RFno signal.

    3. Mstar Main S/W program download3-1. Preliminary steps

    (1) Download method 1 (PCB Assy)- HD

    (2) Connect the download jig to D-sub jack

    3-2. Download steps(1) Execute ISP Tool program in PC, then a main window will

    be opened

    (2) Click the connect button and confirm Dialog Box.

    (3) Click the Config button and Change speedE2PROM Device setting : over the 350Khz

    (4) Read and write bin fileClick (1)Read tab, and then load download file(XXXX.bin)by clicking Read.

    (5).Click Auto(2) tab and set as below(6).click Run(3).(7).After downloading, check OK(4) message.

    (1)

    f i l ex x x .bin

    f i l ex x x .bin

    (4) .......... OK

    )(3

    (2)

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    4. USB DOWNLOAD4-1. Preliminary steps

    (1) Put the USB Stick to the USB socket

    (2) Automatically detecting update file in USB Stick

    (3) Select Start Button and press ok button(4) Updating is staring.

    (5) After finish firmware update, The TV set reset detect theupdate file automatically.

    5. Auto Color Balance(ADC)-RGB* Required Equipments

    - Remote controller for adjustment- MSPG-925F Pattern Generator

    5-1. Method of Auto RGB Color Balance(1) Convert to RGB PC in Input-source(2) Input the PC 1024x768 @ 60Hz 1/2 Black & White Pattern

    into RGB.(MSPG-925F model:60, pattern:54)

    (3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)0x00 0x02 instruction.

    5-2. Confirmation(1) We confirm whether 0xF1 (offset), 0xF2 (gain) address of

    EEPROM 0xBC is 0xAA or not.(2) If 0xF1, 0xF2 address of EEPROM 0xBC isnt 0xAA,

    we adjust once more(3) We can confirm the ADC values from 0x00~0x05

    addresses in a page 0xBC* Manual ADC process using Service Remocon. After enter

    Service Mode by pushing ADJ key, execute Auto-RGB bypushing G key at Auto-RGB.

    6. Auto Color Balance(ADC)-Component6-1. Method of Auto Component Color Balance

    (Component Gain/ Offset Adjustment)(1) Convert to Component in Input-source(2) Input the Component (Which has 720p@60Hz YPbPr

    signal : 100% Color Bar into Component. (MSPG-925FModel: 217/ Pattern: 65 )

    (3) Adjust by commanding AUTO_COLOR_ADJUST (0xF1)0x00 0x02 instruction

    6-2. Confirmation(1) We confirm whether 0xF3 (offset), 0xF4 (gain) address of

    EEPROM 0xBC is 0xAA or not.(2) If 0xF3, 0xF4 address of EEPROM 0xBC isnt 0xAA,

    we adjust once more.(3) We can confirm the ADC values from 0x06~0x0B

    adresses in a page 0xBC.* Manual ADC process using Service Remocon. After enter

    Service Mode by pushing ADJ key, execute Auto-RGB bypushing G key at Auto-RGB

  • Before PCBA check, you have to change the Tool option, Areaoption and have to AC off/on (Plug out and in)(If missing this process, set can operate abnormally)

    7. Input Tool Option, Area Option(1) Equipment : adjustment remote control.(2) Profile : Must be changed the option value because being

    different with some setting value depend onmodule maker, inch and market.

    (3) Adjustment methodThe input methods are same as other chassis.(Use IN-START Key on the Adjust Remocon.)(If not changed the option, the input menu can differ themodel spec.)* Refer to Job Expression of each main chassis assy

    (EBTxxxxxxxx) for Option value

    * Never push the IN-STOP KEY after completing the functioninspection.

    ** After TOOL Option/ Area Option change, you have to ACoff/oon (Plug out and in)

    Before PCBA check , you have to change the Tool opition,Area option and have to AC off/on (Plug out and in)(If missing this process, set can operate abnormally)

    8. Check S/W version, USB Version8-1. Method

    (1) Push In-start key on Adjust remote-control.(2) Check MainV3.xx USB V3.xx

    9. EDID (The Extended Display Identification Data )/DDC (Display Data Channel) download

    * CautionUse the proper signal cable for EDID Download

    9-1. EDID DOWNLOAD* Caution:

    - Never connect HDMI & D-SUB Cable at the same time.- Use the proper cables below for EDID Writing

    * EDID Data

    9-2. EDID DATA - LP81G Model

    / The data is same without Physical address

    -> Physical address(F) : HDMI 1 -> 10, HDMI 2 -> 20

    - 11 - LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    ItemManufacturer IDVersionRevision

    ConditionGSMDigital : 1Digital : 3

    Data1E6D0103

    For HDMI EDIDFor RGB EDID

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 12 -

    - Detail EDID Options are below (A, B, C, D, E, F) A. Product IDB. Serial No: Controlled on production lineC. Month, Year: Controlled on production line:

    ex) Monthly: 09 09Year: 2007 -> 11

    D. Model Name(Hex):

    E. Checksum: Changeable by total EDID data

    10. HDCP SETTING(High-Bandwidth Digital Contents Protection)

    (1) Connect D-sub Signal Cable to D-Sub Jack(2) Input HDCP key with HDCP-key- in-program(3) HDCP Key value is stored on EEPROM(AT24C64) which

    is From 0x80 addresses of 0xA0 page(4) AC off/ on and on HDCP button of MSPG925 and confirm

    whether picture is displayed or not of using MSPG925(5) HDCP Key value is different among the sets.* Before HDCP Download, you have to Set th Configurationthat CMD delay. -> Configuration -> Option -> I2C(16 ByteWrite : 20ms, 128 Byte Read : 20ms, Read CMD Byte : 0.5ms,I2C Clock : 45KHz

    11. Adjustment of White Balance(1) Purpose : Adjust the color temperature to reduce the

    deviation of the module color temperature.

    (2) Principle : To adjust the white balance without thesaturation, Fix the one of R/G/B gain to C0 anddecrease the others.

    (3) Adjustment mode : Two modes of Cool and Warm(Medium data is automatically calibrated by the Cool data)

    (4) Required Equipment1) Remote controller for adjustment 2) Color Analyzer : CA100+ or CA-210 or same product,

    (Should be used in the calibrated ch by CS-1000 (CH9)3) Auto W/B adjustment instrument(only for Auto

    adjustment)

    11-1. Connecting diagram of equipment formeasuring(For automatic adjustment)

    (1) Enter the adjustment mode of DDC- Set command delay time : 50ms- Enter the DDC adjustment mode at the same time heat-

    run mode when pushing the power on by power only key- Maintain the DDC adjustment mode with same condition

    of Heat-run (Maintain after AC off/on in status of Heat-runpattern display)

    (2) Release the DDC adjustment mode- Release the adjust mode after AC off/on or std-by off/on in

    status of finishing the Hear-run mode- Release the Adjust mode when receiving the aging off

    command(F3 00 00) from adjustment equipment- Need to transmit the aging off command to TV set after

    finishing the adjustment.- Check DDC adjust mode release by exit key and release

    DDC adjust mode

    (3) Enter the adjust mode of white balance- Enter the white balance adjustment mode with aging

    command(F3, 00, FF)

    * Luminance min value is 200cd/m2 in the cool mode (For LCD)

    11-2. Adjustment of White Balance(for Manual adjustment)

    (1) Adjustment mode : Two modes (Cool and Warm)(Medium data is automatically calibrated by the Cool data)

    (2) Color analyzer(CA100+, CA210) should be used in thecalibrated ch by CS-1000(LCD : CH9, PDP : CH10)

    (3) Operate the zero-calibration of the CA100+ or CA-210,then stick sensor to the module when adjusting.

    (4) For manual adjustment, it is also possible by the followingsequence.1) Select white pattern of heat-run by pressing POWER

    ON key on remote control for adjustment then operateheat run longer than 15 minutes. (If not executed thisstep, the condition for W/B may be different.)

    2) Push Exit key.3) Change to the AV mode by remote control.(Push front-

    AV or Input key)4) Input external pattern(85% white pattern)5) Push the ADJ key two times (entering White Balance

    mode)6) Stick the sensor to the center of the screen and select

    each items (Red/Green/Blue Gain and Offset) usingD/E(CH +/-) key on R/C.

    7) Adjust R/ G/ B Gain using F/G(VOL +/-) key on R/C.8) Adjust two modes (Cool and Warm)

    (Fix the one of R/G/B and change the others)9) When adjustment is completed, Exit adjustment mode

    using EXIT key on R/C.

    Model name Model Name(HEX)LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 13 -

    * CASEFirst adjust the coordinate far away from the target value(x, y).

    (1) x, y > target1) Decrease the R, G.

    (2) x, y < target1) First decrease the B gain, 2) Decrease the one of the others.

    - In case of decreasing the x, decreasing the R : fix G- In case of decreasing the y, decreasing the G : fix R

    (3) x > target , y < target1) First decrease B, so make y a little more than the

    target.2) Adjust x value by decreasing the R

    (4) x < target , y > target1) First decrease B, so make x a little more than the

    target.2) Adjust x value by decreasing the G

    - Standard color coordinate and temperature when using theCA100+ or CA210 equipment

    Mode Color coordinate Temp uvX Y

    Cool 0.2760.002 0.2830.002 11,000K 0.000Warm 0.3130.002 0.3290.002 6,500K 0.003

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 14 -

    TROUBLESHOOTING1. No power

    (1) Symptom1) It is not discharged minutely from module.2) Light does not come into the front LED.

    (2) Check process

    Plug in the power cord.No

    Yes

    Is plug in powercord inserted?

    Connect the cable to SC100No

    Yes

    Are the line filter andPSU connected?

    Replace the fuse.No

    Yes

    Is the fuse of PSUnormal? (F101)

    Connect a cable P1100.

    After all cables connect is removed to PSU, theAC voltage marking is authorized on manual.When ST-BY 5V is not operated. replace PSU.

    No

    Yes

    Is it connectedthat PSU and P1100

    in Main B/D?

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 15 -

    2. No Raster

    (1) Symptom1) No OSD and image occur at screen. 2) It maintains the condition where the front LED is green.

    (2) Check process

    3. Unusual display from RF mode

    Check the LCD Module

    Replace thePower board.

    Doesminute discharge

    at Module?Is the inverter

    / VaVs on?

    Is output the normalityLow/High voltage exceptStand-by 5V?

    Yes

    No No

    Is the link cablenormal?

    Yes

    Is the IC801soutput normal?

    Reconnect Panel line cable.(HD : P403, FHD : P402)

    No

    Replace the VSC.No

    Yes

    Check the power.

    Isvideo output of the

    Tuner normal? (CheckTU500_Pin13)

    Is theinput voltage

    normal?(CheckPin3)

    Is the I2C communication normal?(Check Pin9, Pin10)

    Yes

    No Yes

    Is the LVDSCable connected?

    well

    Yes

    Change the IC(IC801)

    Cable inserts well.No

    No

    Check the Tuner.

    No

    Block A

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 16 -

    4. Unusual display from rear AV mode.

    Yes

    Is video input ofthe A/V Jack normal?

    (Check R8044)Check the input source.

    Same as Block A.

    No

    5. Unusual display from Side AV model.

    Yes

    Is video input ofthe Side A/V Jack normal?

    (Check R8043)Check the input source.

    Same as Block A.

    No

    6. Unusual display from Side S-Video mode.

    Yes

    Is video input ofthe S-Video Jack normal?

    (Check R8041/42)Check the input source.

    Same as Block A.

    No

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 17 -

    7. Unusual display from component 1 mode

    Yes

    Is videoinput of the Com1

    Jack normal? (CheckR8011/12/13)

    Check the input source.

    Change IC801.

    No

    8. Unusual display from component 2 model

    Yes

    Is videoinput of the Com2

    Jack normal? (CheckR8030/32/33)

    Check the input source.

    Change IC801.

    No

    9. Unusual display from RGB model

    Yes

    Is videoinput of the Com2

    Jack normal? (CheckR8035/37/39)

    Check the input source.

    Change IC801.

    No

  • - 18 - LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    Set on speakerin menu.

    Download the EDID data..

    Check the signal afterIC600 refer to circuitdiagram.

    No No

    No

    Check the Tuner In/Out.No

    No

    Check the Speakercable.

    No

    Replace IC600.No

    Replace IC801.No

    Yes

    Yes

    All input(mode)is no sound.

    Only HDMI isno sound.

    Is the speakercable normal?

    Is the speakeron it menu?

    Yes

    Only AV/COM2/PCinput is no sound.

    Is the output ofIC600 normal?

    Yes

    Yes

    Only RF is no sound.

    Yes

    Is IC801 operatednormality?

    Yes

    Replace IC601.

    Replace Main B/D.

    NoIs IC601/IC603operatednormality?

    Yes

    10. No Sound(1) Symptom

    1) LED is green2) Screen display but sound is not output.

    (2) Check process

  • LGE Internal Use OnlyCopyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    - 19 -

    AV1

    in

    Side

    AV in

    (AV2

    in)

    Com

    p1 in

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    IN

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    DIS

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    BLOCK DIAGRAM

  • - 20 - LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved. Only for training and service purposes

    300

    122

    123

    200

    510 5

    11

    500

    125

    806

    802

    804

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    EXPLODED VIEW

    Many electrical and mechanical parts in this chassis have special safety-related characteristics. Theseparts are identified by in the Schematic Diagram and EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components asrecommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

    IMPORTANT SAFETY NOTICE

  • Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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  • Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

    LGE Internal Use Only

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  • Copyright 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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    390

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    15K

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    39

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    4

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    USB DOWN STREAM

    KJA-UB-4-0004

    P701

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    DEC_656[3]

    RAMDAT[6]

    RAMA

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    RAMD

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    RAMADD[9]

    RAM

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    2]

    RAMDAT[5]

    RAMA

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    DEC_656[2]

    RAM

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    RAM

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    RAMDAT[7]

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    RAMDAT[14]

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    RAMDAT[13]

    RAM

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    RAMDAT[4]

    RAMD

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    RAMADD[2]

    RAMADD[6]

    DEC_656[0]

    RAMA

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    RAMDAT[8]

    RAM

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    RAMADD[1]

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    RAMD

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    RAMDAT[15]

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    7

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