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LG_44SZ8R_52SZ8R_[SM]


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                                                  website:http://biz.LGservice.com
                                  e-mail:http://www.LGEservice.com/techsup.html




DLP Projection TV
SERVICE MANUAL
CHASSIS : MB-05DA

MODEL : 44/52SZ8R
MODEL : 44/52SZ8R-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.




 TV/AV   MENU   OK   VOL   PR
                                                    CONTENTS



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

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

SERVICING PRECAUTIONS .......................................................................................... 4

CONTROL DESCRIPTIONS ............................................................................................6

SPECIFICATIONS ..........................................................................................................10

ADJUSTMENT INSTRUCTIONS ....................................................................................18

BLOCK DIAGRAM..........................................................................................................26

EXPLODED VIEW .................................................................................................... 32,34

EXPLODED VIEW PARTS LIST ................................................................................33,35

REPLACEMENT PARTS LIST .......................................................................................36

REPLACEMENT THE LAMP .........................................................................................46

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

PRINTED CIRCUIT BOARD ...............................................................................................
                                          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 X-RADIATION, Shock, Fire, or other Hazards.
 Do not modify the original design without permission of manufacturer.



General Guidance                                                    Leakage Current Cold Check(Antenna Cold Check)
                                                                    With the instrument AC plug removed from AC source,
An isolation Transformer should always be used during               connect an electrical jumper across the two AC plug prongs.
the servicing of a receiver whose chassis is not isolated from      Place the AC switch in the on position, connect one lead of
the AC power line. Use a transformer of adequate power rating       ohm-meter to the AC plug prongs tied together and touch other
as this protects the technician from accidents resulting in         ohm-meter lead in turn to each exposed metallic parts such as
personal injury from electrical shocks.                             antenna terminals, phone jacks, etc.
                                                                    If the exposed metallic part has a return path to the chassis, the
It will also protect the receiver and it's components from being    measured resistance should be between 1M and 5.2M.
damaged by accidental shorts of the circuitry that may be           When the exposed metal has no return path to the chassis the
inadvertently introduced during the service operation.              reading must be infinite.
                                                                    An other abnormality exists that must be corrected before the
If any fuse (or Fusible Resistor) in this TV receiver is blown,     receiver is returned to the customer.
replace it with the specified.
                                                                    Leakage Current Hot Check (See below Figure)
When replacing a high wattage resistor (Oxide Metal Film            Plug the AC cord directly into the AC outlet.
Resistor, over 1W), keep the resistor 10mm away from PCB.           Do not use a line Isolation Transformer during this check.
                                                                    Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
Keep wires away from high voltage or high temperature parts.        between a known good earth ground (Water Pipe, Conduit, etc.)
                                                                    and the exposed metallic parts.
Due to high vacuum and large surface area of picture tube,          Measure the AC voltage across the resistor using AC
extreme care should be used in handling the Picture Tube.           voltmeter with 1000 ohms/volt or more sensitivity.
Do not lift the Picture tube by it's Neck.                          Reverse plug the AC cord into the AC outlet and repeat AC
                                                                    voltage measurements for each exposed metallic part. Any
Before returning the receiver to the customer,                      voltage measured must not exceed 0.75 volt RMS which is
                                                                    corresponds to 0.5mA.
always perform an AC leakage current check on the exposed           In case any measurement is out of the limits specified, there is
metallic parts of the cabinet, such as antennas, terminals, etc.,   possibility of shock hazard and the set must be checked and
to be sure the set is safe to operate without damage of             repaired before it is returned to the customer.
electrical shock.
                                                                    Leakage Current Hot Check circuit

                                                                                           AC Volt-meter




                                                                                                               Good Earth Ground
                                                                                                               such as WATER PIPE,
                                                                      To Instrument's                          CONDUIT etc.
                                                                                                 0.15uF
                                                                      exposed
                                                                      METALLIC PARTS


                                                                                             1.5 Kohm/10W
                                          SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service           transistors and semiconductor "chip" components. The
manual and its supplements and addenda, read and follow the           following techniques should be used to help reduce the
SAFETY PRECAUTIONS on page 3 of this publication.                     incidence of component damage caused by static by static
NOTE: If unforeseen circumstances create conflict between the         electricity.
following servicing precautions and any of the safety                 1. Immediately before handling any semiconductor component
precautions on page 3 of this publication, always follow the             or semiconductor-equipped assembly, drain off any
safety precautions. Remember: Safety First.                              electrostatic charge on your body by touching a known earth
                                                                         ground. Alternatively, obtain and wear a commercially
General Servicing Precautions                                            available discharging wrist strap device, which should be
1. Always unplug the receiver AC power cord from the AC                  removed to prevent potential shock reasons prior to
   power source before;                                                  applying power to the unit under test.
   a. Removing or reinstalling any component, circuit board           2. After removing an electrical assembly equipped with ES
      module or any other receiver assembly.                             devices, place the assembly on a conductive surface such as
   b. Disconnecting or reconnecting any receiver electrical plug         aluminum foil, to prevent electrostatic charge buildup or
      or other electrical connection.                                    exposure of the assembly.
   c. Connecting a test substitute in parallel with an electrolytic   3. Use only a grounded-tip soldering iron to solder or unsolder
      capacitor in the receiver.                                         ES devices.
      CAUTION: A wrong part substitution or incorrect                 4. Use only an anti-static type solder removal device. Some
      polarity installation of electrolytic capacitors may result        solder removal devices not classified as "anti-static" can
      in an explosion hazard.                                            generate electrical charges sufficient to damage ES devices.
   d. Discharging the picture tube anode.                             5. Do not use freon-propelled chemicals. These can generate
2. Test high voltage only by measuring it with an appropriate            electrical charges sufficient to damage ES devices.
   high voltage meter or other voltage measuring device (DVM,         6. Do not remove a replacement ES device from its protective
   FETVOM, etc) equipped with a suitable high voltage probe.             package until immediately before you are ready to install it.
   Do not test high voltage by "drawing an arc".                         (Most replacement ES devices are packaged with leads
3. Discharge the picture tube anode only by (a) first connecting         electrically shorted together by conductive foam, aluminum
   one end of an insulated clip lead to the degaussing or kind           foil or comparable conductive material).
   aquadag grounding system shield at the point where the             7. Immediately before removing the protective material from
   picture tube socket ground lead is connected, and then (b)            the ieads of a replacement ES device, touch the protective
   touch the other end of the insulated clip lead to the picture         material to the chassis or circuit assembly into which the
   tube anode button, using an insulating handle to avoid                device will be installed.
   personal contact with high voltage.                                   CAUTION:Be sure no power is applied to the chassis or
4. Do not spray chemicals on or near this receiver or any of its         circuit, and observe all other safety precautions.
   assemblies.                                                        8. Minimize bodily motions when handling unpackaged
5. Unless specified otherwise in this service manual, clean              replacement ES devices. (Otherwise harmless motion such
   electrical contacts only by applying the following mixture to         as the brushing together of your clothes fabric or the lifting
   the contacts with a pipe cleaner, cotton-tipped stick or              of your foot from a carpeted floor can generate static
   comparable nonabrasive applicator; 10% (by volume)                    electricity sufficient to damage an ES device.)
   Acetone and 90% (by volume) isopropyl alcohol (90%-99%
   strength)                                                          General Soldering Guidelines
   CAUTION: This is a flammable mixture.                              1. Use a grounded-tip, low-wattage soldering iron and
   Unless specified otherwise in this service manual, lubrication        appropriate tip size and shape that will maintain tip
   of contacts in not required.                                          temperature within the range or 500 F to 600 F.
6. Do not defeat any plug/socket B+ voltage interlocks with           2. Use an appropriate gauge of RMA resin-core solder
   which receivers covered by this service manual might be               composed of 60 parts tin/40 parts lead.
   equipped.                                                          3. Keep the soldering iron tip clean and well tinned.
7. Do not apply AC power to this instrument and/or any of its         4. Thorohly clean the surfaces to be soldered. Use a mall wire
   electrical assemblies unless all solid-state device heat sinks        bristle (0.5 inch, or 1.25cm) brush with a metal handle.
   are correctly installed.                                              Do not use freon-propelled spray-on cleaners.
8. Always connect the test receiver ground lead to the                5. Use the following unsoldering technique
   receiver chassis ground before connecting the test receiver           a. Allow the soldering iron tip to reach normal temperature.
   positive lead.                                                           (500 F to 600 F)
   Always remove the test receiver ground lead last.                     b. Heat the component lead until the solder melts.
9. Use with this receiver only the test fixtures specified in this       c. Quickly draw the melted solder with an anti-static,
   service manual.                                                          suction-type solder removal device or with solder braid.
   CAUTION: Do not connect the test fixture ground strap to                 CAUTION: Work quickly to avoid overheating the circuit
   any heatsink in this receiver.                                           board printed foil.
                                                                      6. Use the following soldering technique.
Electrostatically Sensitive (ES) Devices                                 a. Allow the soldering iron tip to reach a normal
Some semiconductor (solid state) devices can be damaged                     temperature (500 F to 600 F)
easily by static electricity. Such components commonly are               b. First, hold the soldering iron tip and solder the strand
called Electrostatically Sensitive (ES) Devices. Examples of                against the component lead until the solder melts.
typical ES devices are integrated circuits and some field effect
   c. Quickly move the soldering iron tip to the junction of the     Fuse and Conventional Resistor
      component lead and the printed circuit foil, and hold it       Removal/Replacement
      there only until the solder flows onto and around both the     1. Clip each fuse or resistor lead at top of the circuit board
      component lead and the foil.                                      hollow stake.
      CAUTION: Work quickly to avoid overheating the circuit         2. Securely crimp the leads of replacement component around
      board printed foil.                                               notch at stake top.
   d. Closely inspect the solder area and remove any excess          3. Solder the connections.
      or splashed solder with a small wire-bristle brush.               CAUTION: Maintain original spacing between the replaced
                                                                        component and adjacent components and the circuit board
IC Remove/Replacement                                                   to prevent excessive component temperatures.
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the       Circuit Board Foil Repair
circuit foil. When holes are the slotted type, the following         Excessive heat applied to the copper foil of any printed circuit
technique should be used to remove and replace the IC. When          board will weaken the adhesive that bonds the foil to the circuit
working with boards using the familiar round hole, use the           board causing the foil to separate from or "lift-off" the board.
standard technique as outlined in paragraphs 5 and 6 above.          The following guidelines and procedures should be followed
                                                                     whenever this condition is encountered.
Removal
1. Desolder and straighten each IC lead in one operation by          At IC Connections
   gently prying up on the lead with the soldering iron tip as the   To repair a defective copper pattern at IC connections use the
   solder melts.                                                     following procedure to install a jumper wire on the copper
2. Draw away the melted solder with an anti-static suction-          pattern side of the circuit board. (Use this technique only on IC
   type solder removal device (or with solder braid) before          connections).
   removing the IC.
Replacement                                                          1. Carefully remove the damaged copper pattern with a sharp
1. Carefully insert the replacement IC in the circuit board.            knife. (Remove only as much copper as absolutely
2. Carefully bend each IC lead against the circuit foil pad and         necessary).
   solder it.                                                        2. carefully scratch away the solder resist and acrylic coating
3. Clean the soldered areas with a small wire-bristle brush.            (if used) from the end of the remaining copper pattern.
   (It is not necessary to reapply acrylic coating to the areas).    3. Bend a small "U" in one end of a small gauge jumper wire and
                                                                        carefully crimp it around the IC pin. Solder the IC connection.
"Small-Signal" Discrete Transistor                                   4. Route the jumper wire along the path of the out-away
Removal/Replacement                                                     copper pattern and let it overlap the previously scraped end
1. Remove the defective transistor by clipping its leads as             of the good copper pattern. Solder the overlapped area and
   close as possible to the component body.                             clip off any excess jumper wire.
2. Bend into a "U" shape the end of each of three leads
   remaining on the circuit board.                                   At Other Connections
3. Bend into a "U" shape the replacement transistor leads.           Use the following technique to repair the defective copper
4. Connect the replacement transistor leads to the                   pattern at connections other than IC Pins. This technique
   corresponding leads extending from the circuit board and          involves the installation of a jumper wire on the component
   crimp the "U" with long nose pliers to insure metal to metal      side of the circuit board.
   contact then solder each connection.
                                                                     1. Remove the defective copper pattern with a sharp knife.
Power Output, Transistor Device                                         Remove at least 1/4 inch of copper, to ensure that a
Removal/Replacement                                                     hazardous condition will not exist if the jumper wire opens.
1. Heat and remove all solder from around the transistor leads.      2. Trace along the copper pattern from both sides of the
2. Remove the heatsink mounting screw (if so equipped).                 pattern break and locate the nearest component that is
3. Carefully remove the transistor from the heat sink of the            directly connected to the affected copper pattern.
   circuit board.                                                    3. Connect insulated 20-gauge jumper wire from the lead of
4. Insert new transistor in the circuit board.                          the nearest component on one side of the pattern break to
5. Solder each transistor lead, and clip off excess lead.               the lead of the nearest component on the other side.
6. Replace heatsink.                                                    Carefully crimp and solder the connections.
                                                                        CAUTION: Be sure the insulated jumper wire is dressed so
Diode Removal/Replacement                                               the it does not touch components or sharp edges.
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.
                                                   CONTROL DESCRIPTIONS

                                                       All the functions can be controlled with the remote control handset.
                                                       Some functions can also be adjusted with the buttons on the front
                                                       panel of the set.
                                                       Remote control handset
      POWER
1                                                      Before you use the remote control handset, please install the bat-
     MULTIMEDIA                   TV/AV
                                                       teries. See the next page.
2                                                 13
3                                                      1. POWER
            MUTE                  SLEEP
4                                                         switches the set on from standby or off to standby.
            PIP                   TEXT                 2. MULTIMEDIA
5                                                         selects Component 1/2, RGB or HDMI modes.
     PR -                                PR +
                                                       3. SLEEP
     SWAP                             INPUT               sets the sleep timer.
6
                                                  15 4. MUTE
       MENU         PR            CANCEL/EXIT
7                                                       switches the sound on or off.
                                                       5. PIP BUTTONS
                     OK
                                                          PIP
        VOL                         VOL
                                                          switches the sub picture on or off.
8                                                         PR +/-
                                                          selects a programme for the sub picture.
                                                          SWAP
                                                          alternates between main and sub picture.
                                                          INPUT
                    PR
                                                          selects the input mode for the sub picture.
            1         2               3
                                                          SIZE
                                                          adjusts the sub picture size.
            4         5               6                   POSITION
9                                                           Moves the sub picture to   D   / E or F / G direction.
            7         8               9
                                                     6. SWAP
        PSM           0              SSM                returns to the previously viewed programme.
10                                                16    selects a favorite programme.
     POSITION      SIZE            STILL
                                                  17 7. MENU
      INDEX        TIME           REVEAL      ?         selects a menu.
11    MIX         MODE    M   /      L IS T            8.   D  / E (Programme Up/Down)
                                                            selects a programme or a menu item.
12       I/II       ARC                                     switches the set on from standby.
18                                                14        F / G (Volume Down/Up)
     STOP          P/STILL         REC                      adjusts the volume.
                                                  19        adjusts menu settings.
         REW       PLAY             FF
                                                            OK
                                                            accepts your selection or displays the current mode.
                                                       9. NUMBER BUTTONS
                                                          switches the set on from standby or directly select a number.
                                                       10. PSM (Picture Status Memory)
                                                           recalls your preferred picture setting.
                                                       11. TELETEXT BUTTONS (option)
                                                           These buttons are used for teletext.
                                                           For further details, see the `Teletext' section.
                                                       12. LIST
       (With TELETEXT)                                     displays the programme table.
13. TV/AV
    selects the remote operating mode.
    switches the set on from standby.
                                                                             POWER
14. ARC (Aspect Ratio Control)                                          1
    changes the picture format.                                             MULTIMEDIA              TV/AV
                                                                        2                                         13
15. CANCEL/EXIT                                                                    LIST             ARC
    Clears all on-screen displays and returns to TV viewing from any 12                                           14
                                                                                   MUTE              PIP
    menu.                                                            4                                            5
                                                                            PR -                           PR +
16. SSM (Sound Status Memory)
    recalls your preferred sound setting.                                   SWAP                        INPUT
                                                                        6
                                                                              MENU         PR       CANCEL/EXIT
17. STILL                                                               7                                         15
    freezes motion of the picture.

18. I/II                                                                       VOL          OK
                                                                                                      VOL
    selects the language during dual language broadcast.                8
    selects the sound output.

19. VCR BUTTONS
    control a video cassette recorder.
                                                                                           PR

Note : In teletext mode, the PR + / -, SWAP and INPUT buttons are                  1         2             3
used for teletext function.
                                                                                   4         5             6
Battery installation                                                    9
                                                                                   7         8             9

The remote control handset is powered by two AAA type batteries.              PSM            0         SSM
To load the batteries, turn the remote control handset over and 10                                                16
open the battery compartment. Install two batteries as indicated by
the polarity symbols ( + and - ) marked inside the compartment.              POSITION      SIZE        STILL
                                                                                                                  17
                                                                             SLEEP          I/II
                                                                        3                                         18

                                                                            STOP          P/STILL    REC

                                                                                REW       PLAY        FF          19

Note : To avoid damage from possible battery leakage, remove the
batteries if you do not plan to use the remote control handset for an
extended period of time.




                                                                            (Without TELETEXT)
 Front panel
 Lamp indicator, operation indicator, and temperature indicator, located side the front panel controls
 reveal the operating status of the DLP(Digital Light Processing) projection TV.




                                                                                                ON/OFF


                                 TV/AV   MENU   OK   VOL   PR




                TV/AV   MENU   OK                               VOL       PR




 1                2      3      4                                5        6                 7     8      9       10


1. REMOTE CONTROL SENSOR                                              7. OPERATION INDICATOR (Refer to p.7)

2. TV/AV                                                              8. LAMP INDICATOR (Refer to p.7)
   selects the remote operating mode.
   switches the set on from standby.                                  9. TEMPERATURE INDICATOR (Refer to p.7)

3. MENU                                                               10. MAIN POWER (ON/OFF)
   selects a menu.                                                        switches the set on or off.

4. OK                                                                 Note : There might be a faint white trace on the
   accepts your selection or displays the current                     center of the screen according to the position.
   mode.                                                              This is normal and is a characteristic of the
                                                                      screen.
5.   F / G (Volume Down/Up)
     adjusts the volume.
     adjusts menu settings.

6.   D / E (Programme Up/Down)
     selects a programme or a menu item.
     switches the set on from standby.
 Rear panel




                                                                                                                                                                                              (R)   AV4 INPUT
                                                                                                                                                                                      AUDIO         SOCKET
                                                                                                                                                                                          (L)/
                                                                                                                                                                                         MONO
                                                                                                                                                                                     VIDEO

                                                                                                                                                                                                    S-VIDEO
                                                                                                                                                                                     S-VIDEO        INPUT
                                                                                                                                                                                                    SOCKET
                                                                                                                                      COMPONENT
                                                                                                                                                                        (R)
                                                                                                                                  INPUT 2     INPUT 1
                                                                                                                                                              AUDIO
                                                                                                                                 480i/480p/   480i/480p/
                                                                                                                                 576i/576p/   576i/576p/
                                                                                                                                                                        (L)/
                                                                                                                                 720p/1080i   720p/1080i
                                                                                                                                                                        MONO
                                                                                                                                                              VIDEO

                                                                                 AV1         AV2   AV3          PC/DTV                              Y
                                                                                                                (SXGA/
                                                                                                                480p/                                         S-VIDEO
                                                                                                                576p/                              PB
                                                                                                                720p/
                                                                                                                1080i)
                                                                                                                                                   PR          AV3
                                                                                                         U
                                                                                                                RGB INPUT                                     INPUT
                                                                                                         P P      (L)
                                                                                                         GO                                        (L)
                                                                                                         R R    AUDIO
                                                                                                         A T                                     AUDIO
                                                                                                                  (R)
                                                                                                         D
                                                                                                                                                   (R)



                                                                                                                                                                                       AV 4
                                                                                                         E

                                                                                                               DVI / RGB INPUT




                                                                                 HDMI/DVI INPUT

                                                                                                                                                                                      INPUT




     UPGRADE PORT
       This port is used to
upgrade the software ver-
   sion and debug without
   changing the hardware.                                                                                                                          COMPONENT


 Be careful not to use this                                                                                                  INPUT 2
                                                                                                                    480i/480p/
                                                                                                                                                           INPUT 1
                                                                                                                                                           480i/480p/

    port. Just contact your                                                                                         576i/576p/
                                                                                                                    720p/1080i
                                                                                                                                                           576i/576p/
                                                                                                                                                           720p/1080i


  dealer or service centre.              AV1         AV2   AV3          PC/DTV
                                                                        (XGA/
                                                                                                                                                                                Y

                                                                        480p/
                                                                        576p/
                                                                        720p/
                                                                                                                                                                               PB
                                                                                                                                                                                                    DTV/DVD
  AV1/AV2/AV3 INPUT                                                     1080i)


                                                                        RGB INPUT
                                                                                                                                                                               PR
                                                                                                                                                                                                    INPUT
                                                                 U

           SOCKETS                                               P P
                                                                 GO
                                                                 R R
                                                                          (L)
                                                                        AUDIO
                                                                                                                                                                               (L)

                                                                 A T                                                                                          AUDIO
                                                                          (R)
                                                                 D
                                                                                                                                                                               (R)
                                                                 E

                                                                       DVI / RGB INPUT




               HDMI/DVI                   HDMI/DVI
                                                                                                                                                                                                    AERIAL
                                                                                                                                                                                                    SOCKET
                                                                                                                                                                                                    RGB INPUT







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