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LG_37LG6000_[SM]


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                                                        Internal Use Only
                                              website:http://biz.LGservice.com




LCD TV
SERVICE MANUAL
CHASSIS : LD89D

MODEL : 37LG6000                     37LG6000-ZA

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




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

               PRODUCT SAFETY ..................................................................................3

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

               ADJUSTMENT INSTRUCTION ...............................................................15

               TROUBLE SHOOTING ............................................................................17

               BLOCK DIAGRAM...................................................................................24

               EXPLODED VIEW .................................................................................. 25

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




Copyright C 2008 LG Electronics. Inc. All right reserved.         -2-                                              LGE Internal Use Only
Only for training and service purposes
                                              SAFETY PRECAUTIONS

                                                IMPORTANT SAFETY NOTICE
 Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
 Schematic Diagram and Replacement Parts List.
 It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
 Shock, Fire, or other Hazards.
 Do not modify the original design without permission of manufacturer.


General Guidance                                                       Leakage Current Hot Check (See below Figure)
                                                                       Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC      Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this         Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
protects the technician from accidents resulting in personal injury    between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks.                                                and the exposed metallic parts.
                                                                       Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being       with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be              Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation.                 measurements for each exposed metallic part. Any voltage
                                                                       measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown,        0.5mA.
replace it with the specified.                                         In case any measurement is out of the limits specified, there is
                                                                       possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor,     repaired before it is returned to the customer.
over 1W), keep the resistor 10mm away from PCB.
                                                                       Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
                                                                                            AC Volt-meter
Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical                                                Good Earth Ground
shock.                                                                                                         such as WATER PIPE,
                                                                       To Instrument's                         CONDUIT etc.
                                                                                                 0.15uF
Leakage Current Cold Check(Antenna Cold Check)                         exposed
                                                                       METALLIC PARTS
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC                            1.5 Kohm/10W
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M and 5.2M.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.




Copyright C 2008 LG Electronics. Inc. All right reserved.          -3-                                            LGE Internal Use Only
Only for training and service purposes
                                          SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service             2. After removing an electrical assembly equipped with ES
manual and its supplements and addenda, read and follow the                devices, place the assembly on a conductive surface such as
SAFETY PRECAUTIONS on page 3 of this publication.                          aluminum foil, to prevent electrostatic charge buildup or
NOTE: If unforeseen circumstances create conflict between the              exposure of the assembly.
following servicing precautions and any of the safety precautions on    3. Use only a grounded-tip soldering iron to solder or unsolder ES
page 3 of this publication, always follow the safety precautions.          devices.
Remember: Safety First.                                                 4. Use only an anti-static type solder removal device. Some solder
                                                                           removal devices not classified as "anti-static" can generate
General Servicing Precautions                                              electrical charges sufficient to damage ES devices.
1. Always unplug the receiver AC power cord from the AC power           5. Do not use freon-propelled chemicals. These can generate
   source before;                                                          electrical charges sufficient to damage ES devices.
   a. Removing or reinstalling any component, circuit board             6. Do not remove a replacement ES device from its protective
      module or any other receiver assembly.                               package until immediately before you are ready to install it.
   b. Disconnecting or reconnecting any receiver electrical plug or        (Most replacement ES devices are packaged with leads
      other electrical connection.                                         electrically shorted together by conductive foam, aluminum foil
   c. Connecting a test substitute in parallel with an electrolytic        or comparable conductive material).
      capacitor in the receiver.                                        7. Immediately before removing the protective material from the
      CAUTION: A wrong part substitution or incorrect polarity             leads of a replacement ES device, touch the protective material
      installation of electrolytic capacitors may result in an             to the chassis or circuit assembly into which the device will be
      explosion hazard.                                                    installed.
                                                                           CAUTION: Be sure no power is applied to the chassis or circuit,
2. Test high voltage only by measuring it with an appropriate high         and observe all other safety precautions.
   voltage meter or other voltage measuring device (DVM,                8. Minimize bodily motions when handling unpackaged
   FETVOM, etc) equipped with a suitable high voltage probe.               replacement ES devices. (Otherwise harmless motion such as
   Do not test high voltage by "drawing an arc".                           the brushing together of your clothes fabric or the lifting of your
3. Do not spray chemicals on or near this receiver or any of its           foot from a carpeted floor can generate static electricity sufficient
   assemblies.                                                             to damage an ES device.)
4. Unless specified otherwise in this service manual, clean
   electrical contacts only by applying the following mixture to the    General Soldering Guidelines
   contacts with a pipe cleaner, cotton-tipped stick or comparable      1. Use a grounded-tip, low-wattage soldering iron and appropriate
   non-abrasive applicator; 10% (by volume) Acetone and 90% (by            tip size and shape that will maintain tip temperature within the
   volume) isopropyl alcohol (90%-99% strength)                            range or 500 F to 600 F.
   CAUTION: This is a flammable mixture.                                2. Use an appropriate gauge of RMA resin-core solder composed
   Unless specified otherwise in this service manual, lubrication of       of 60 parts tin/40 parts lead.
   contacts in not required.                                            3. Keep the soldering iron tip clean and well tinned.
5. Do not defeat any plug/socket B+ voltage interlocks with which       4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
   receivers covered by this service manual might be equipped.             bristle (0.5 inch, or 1.25cm) brush with a metal handle.
6. Do not apply AC power to this instrument and/or any of its              Do not use freon-propelled spray-on cleaners.
   electrical assemblies unless all solid-state device heat sinks are   5. Use the following unsoldering technique
   correctly installed.                                                    a. Allow the soldering iron tip to reach normal temperature.
7. Always connect the test receiver ground lead to the receiver                (500 F to 600 F)
   chassis ground before connecting the test receiver positive lead.       b. Heat the component lead until the solder melts.
   Always remove the test receiver ground lead last.                       c. Quickly draw the melted solder with an anti-static, suction-
8. Use with this receiver only the test fixtures specified in this             type solder removal device or with solder braid.
   service manual.                                                             CAUTION: Work quickly to avoid overheating the circuitboard
   CAUTION: Do not connect the test fixture ground strap to any                printed foil.
   heat sink in this receiver.                                          6. Use the following soldering technique.
                                                                           a. Allow the soldering iron tip to reach a normal temperature
Electrostatically Sensitive (ES) Devices                                       (500 F to 600 F)
Some semiconductor (solid-state) devices can be damaged easily             b. First, hold the soldering iron tip and solder the strand against
by static electricity. Such components commonly are called                     the component lead until the solder melts.
Electrostatically Sensitive (ES) Devices. Examples of typical ES           c. Quickly move the soldering iron tip to the junction of the
devices are integrated circuits and some field-effect transistors and          component lead and the printed circuit foil, and hold it there
semiconductor "chip" components. The following techniques should               only until the solder flows onto and around both the
be used to help reduce the incidence of component damage                       component lead and the foil.
caused by static by static electricity.                                        CAUTION: Work quickly to avoid overheating the circuit
1. Immediately before handling any semiconductor component or                  board printed foil.
   semiconductor-equipped assembly, drain off any electrostatic            d. Closely inspect the solder area and remove any excess or
   charge on your body by touching a known earth ground.                       splashed solder with a small wire-bristle brush.
   Alternatively, obtain and wear a commercially available
   discharging wrist strap device, which should be removed to
   prevent potential shock reasons prior to applying power to the
   unit under test.

Copyright C 2008 LG Electronics. Inc. All right reserved.           -4-                                                 LGE Internal Use Only
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through          Circuit Board Foil Repair
which the IC leads are inserted and then bent flat against the circuit   Excessive heat applied to the copper foil of any printed circuit
foil. When holes are the slotted type, the following technique should    board will weaken the adhesive that bonds the foil to the circuit
be used to remove and replace the IC. When working with boards           board causing the foil to separate from or "lift-off" the board. The
using the familiar round hole, use the standard technique as             following guidelines and procedures should be followed whenever
outlined in paragraphs 5 and 6 above.                                    this condition is encountered.

Removal                                                                  At IC Connections
1. Desolder and straighten each IC lead in one operation by gently       To repair a defective copper pattern at IC connections use the
   prying up on the lead with the soldering iron tip as the solder       following procedure to install a jumper wire on the copper pattern
   melts.                                                                side of the circuit board. (Use this technique only on IC
2. Draw away the melted solder with an anti-static suction-type          connections).
   solder removal device (or with solder braid) before removing the
   IC.                                                                   1. Carefully remove the damaged copper pattern with a sharp
Replacement                                                                 knife. (Remove only as much copper as absolutely necessary).
1. Carefully insert the replacement IC in the circuit board.             2. carefully scratch away the solder resist and acrylic coating (if
2. Carefully bend each IC lead against the circuit foil pad and             used) from the end of the remaining copper pattern.
   solder it.                                                            3. Bend a small "U" in one end of a small gauge jumper wire and
3. Clean the soldered areas with a small wire-bristle brush.                carefully crimp it around the IC pin. Solder the IC connection.
   (It is not necessary to reapply acrylic coating to the areas).        4. Route the jumper wire along the path of the out-away copper
                                                                            pattern and let it overlap the previously scraped end of the good
"Small-Signal" Discrete Transistor                                          copper pattern. Solder the overlapped area and clip off any
Removal/Replacement                                                         excess jumper wire.
1. Remove the defective transistor by clipping its leads as close as
   possible to the component body.                                       At Other Connections
2. Bend into a "U" shape the end of each of three leads remaining        Use the following technique to repair the defective copper pattern
   on the circuit board.                                                 at connections other than IC Pins. This technique involves the
3. Bend into a "U" shape the replacement transistor leads.               installation of a jumper wire on the component side of the circuit
4. Connect the replacement transistor leads to the corresponding         board.
   leads extending from the circuit board and crimp the "U" with
   long nose pliers to insure metal to metal contact then solder         1. Remove the defective copper pattern with a sharp knife.
   each connection.                                                         Remove at least 1/4 inch of copper, to ensure that a hazardous
                                                                            condition will not exist if the jumper wire opens.
Power Output, Transistor Device                                          2. Trace along the copper pattern from both sides of the pattern
Removal/Replacement                                                         break and locate the nearest component that is directly
1. Heat and remove all solder from around the transistor leads.             connected to the affected copper pattern.
2. Remove the heat sink mounting screw (if so equipped).                 3. Connect insulated 20-gauge jumper wire from the lead of the
3. Carefully remove the transistor from the heat sink of the circuit        nearest component on one side of the pattern break to the lead
   board.                                                                   of the nearest component on the other side.
4. Insert new transistor in the circuit board.                              Carefully crimp and solder the connections.
5. Solder each transistor lead, and clip off excess lead.                   CAUTION: Be sure the insulated jumper wire is dressed so the
6. Replace heat sink.                                                       it does not touch components or sharp edges.

Diode Removal/Replacement
1. 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 if
   necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. 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 replaced
   component and adjacent components and the circuit board to
   prevent excessive component temperatures.

Copyright C 2008 LG Electronics. Inc. All right reserved.            -5-                                              LGE Internal Use Only
Only for training and service purposes
                                                       SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.

1. General Specification(TV)
  No.                     Item                                      Specification                    Remark
   1.   Video input applicable system            PAL-D/K, B/G, I, SECAM
   2.   Receivable Broadcasting System           1) PAL/SECAM B/G                        EU(PAL Market)
                                                 2) PAL/SECAM D/K
                                                 3) PAL I/II
                                                 4) SECAM L/L'
                                                 5) DVB-T
   3.   RF Input Channel                         VHF : E2 ~ E12                          PAL
                                                 UHF : E21 ~ E69
                                                 CATV : S1 ~ S20
                                                 HYPER : S21~ S47
   4.   Input Voltage                            AC 100 ~ 240 V/50Hz, 60Hz
   5.   Picture Size                             37 inch                                 37LG6000/42LG6000/47LG6000
                                                 42 inch
                                                 47 inch
   6.   Tuning System                            FVS 100 program                         PAL, 200 PR.(Option)
   7.   Operating Environment                    1) Temp : 0 ~ 40 deg                    LGE SPEC
                                                 2) Humidity : 10 ~ 90 %
   8.   Storage Environment                      3) Temp : -20 ~ 50 deg                  LGE SPEC
                                                 4) Humidity : 10 ~ 90 %
   9.   Display                                  LCD Module                              LPL




Copyright C 2008 LG Electronics. Inc. All right reserved.          -6-                                LGE Internal Use Only
Only for training and service purposes
2. General Specification(LCD Module)
  No              Item                                      Specification                      Unit                   Remark
  1.    Panel                    37" TFT WUXGA LCD                                                    37LG6000
                                 42" TFT WUXGA LCD                                                    42LG6000
                                 47" TFT WUXGA LCD                                                    47LG6000
  2.    Frequency range          H : 64.1 ~ 67.5Khz, V : 57 ~ 63Hz                                    37 inch
                                 H : 121.8 ~ 136.4Khz, V : 108.2 ~ 121.2Hz                            42 inch
                                 H : 121.8 ~ 136.4Khz, V : 108.2 ~ 121.2Hz                            47 inch
  3.    Power consumption        37 inch               10.76 + 132                             W      LCD + Backlight
                                 42 inch              9.4(Max) + 160.8(Typ)                    W
                                 47 inch               TBD + 240(Max)                          W
  4.    LCD Module-LPL           Type Size            37"      877 x 516.8 x 55.5              mm     (H)x (V)x(D)
                                                      42"      983.0 x 576.0 x 47.3
                                                      47"      1096.0 x 640.0 x 50
                                 Pixel Pitch          37"      0.42675 x 0.42675               mm
                                                      42"      0.4845 x 0.4845
                                                      47"      0.5415 x 0.5415
                                 Pixel Format         1920 horiz. By 1080 vert.                       37/42/47 inch
                                                      Pixels RGB stripe arrangement
                                 Coating              Hard coating(3H), Anti-glare treatment
                                                      of the front polarizer(Haze 13%)
                                 Back Light           37"      16 Lamp(EEFL)
                                                      42"      18 Lamp(EEFL)
                                                      47"      22 Lamp(CCFL)




Copyright C 2008 LG Electronics. Inc. All right reserved.              -7-                                            LGE Internal Use Only
Only for training and service purposes
3. Optical Feature(LCD Module)
  No.               Item                      Specification     Min.       Typ.      Max.              Remark
   1.    Viewing Angle(CR>10)        R/L, U/D                             178, 178
   2.    Luminance                   Luminance (cd/m2)              400     500              42" without PC (PC: min 300)
                                     Variation                               -        1.3    MAX / MIN
   3.    Contrast Ratio              CR(37")                    1000       1400              All white/All black
                                     CR(42")                    1000       1400              without PC (PC:min400)
                                     CR(47")                    TBD        1500
   4.    CIE Color Coordinates        White           WX            Typ    0.279     Typ     37 inch
                                                      WY        -0.03      0.292     +0.03
                                     RED             Xr                    0.641
                                                     Yr                    0.334
                                     Green           Xg                    0.291
                                                     Yg                    0.614
                                     Blue            Xb                    0.145
                                                     Yb                    0.062
                                     White           WX             Typ    0.279     Typ     42 inch
                                                     WY         -0.03      0.292     +0.03
                                     RED             Xr                    0.640
                                                     Yr                    0.335
                                     Green           Xg                    0.289
                                                     Yg                    0.610
                                     Blue            Xb                    0.144
                                                     Yb                    0.066
                                     White           WX             Typ    0.279     Typ     47 inch
                                                     WY         -0.03      0.292     +0.03
                                     RED             Xr                    0.636
                                                     Yr                    0.334
                                     Green           Xg                    0.291
                                                     Yg                    0.613
                                     Blue            Xb                    0.146
                                                     Yb                    0.061

1) Standard Test Condition
2) Surrounding Brightness Level      : dark
3) Surrounding Temperature           : 25



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