LG RT21FB20R Schematic

COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MC-019A

MODEL : RF/RT-21FB20R/RE/RQ/RX/RW

MODEL : RF/RT-21FB20V/VE/VG/VQ/VW

website:http://biz.LGservice.com

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

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CONTENTS

Contents ................................................................................................................. 2

Safety Precautions ............................................................................................3

Servicing Precautions ..................................................................................... 4

Specifications ..................................................................................................... 6

Description of Controls .................................................................................. 7

Disassembly Instructions .............................................................................10

Adjustment ............................................................................................................11

Purity & Convergence Adjustment..........................................................14

Block Diagram ......................................................................................................17

Exploded View .................................................................................................. 18

Exploded View Parts List..............................................................................19

Replacement Parts List ............................................................................... 20

SVC. Sheet ................................................................................................................

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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 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

An lsolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks.

It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitary that may be inadvertently 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.

Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.

X-RAY Radiation

Warning:

To determine the presence of high voltage, use an accurate high impedance HV meter.

Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate

23.5

¡ 1.5KV: 14-19 inch, 26 ¡ 1.5KV: 19-21 inch,

29.0 ¡ 1.5KV: 25-29 inch, 30.0 ¡ 1.5KV: 32 inch If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

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 shock.

Leakage Current Cold Check(Antenna Cold Check)

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 positioin, connect one lead of ohm-meter to the AC 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 1MΩ and 5.2MΩ. 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.

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 capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each esposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5mA. In case any measurement is out of the limits sepcified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued X-RAY RADIATION protection, the replacement tube must be the same type tube as specified in the Replacement Parts List.

IMPORTANT SAFETY NOTICE

0.15uF

- 4 -

CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the

SAFETY PRECAUTIONS

on page 3 of this publication.

NOTE:

If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First.

General Servicing Precautions

1. 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 polarity installation of electrolytic capacitors may result in an explosion hazard.

d. Discharging the picture tube anode.

2. Test high voltage only by measuring it with an appropriate

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

3. Discharge the picture tube anode only by (a) first connecting

one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touch the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage.

4. Do not spray chemicals on or near this receiver or any of its

assemblies.

5. Unless specified otherwise in this service manual, clean

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

6. Do not defeat any plug/socket B+ voltage interlocks with

which receivers covered by this service manual might be equipped.

7. Do not apply AC power to this instrument and/or any of its

electrical assemblies unless all solid-state device heat sinks are correctly installed.

8. Always connect the test receiver ground lead to the

receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last.

9.

Use with this receiver only the test fixtures specified in this service manual.

CAUTION: Do not connect the test fixture ground strap to any heatsink in this receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called

Electrostatically Sensitive (ES) Devices.

Examples of

typical ES devices are integrated circuits and some fieldeffect

transistors and semicounductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electostatic charge on your body by touching a known earth ground. 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.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

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

4. Use only an anti-static type solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficent to demage ES devices.

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

6. Do not remove a repalcement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

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

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the bruching together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintan tip temperature within the range or 500¡£F to 600¡£F.

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

3. Keep the soldering iron tip clean and well tinned.

4. Thorohly clean the surfaces to be soldered. Use a mall wirebristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.

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

(500¡£F to 600¡£F) 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

circuiboard printed foil.

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

temperature (500¡£F to 600¡£F)

b. First, hold the soldering iron tip and solder the strand

against the component lead until the solder melts.

SERVICING PRECAUTIONS

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c. Qulckly move the soldering iron tip to the junction of the

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

d. Closely inspect the solder area and remove any excess

or splashed solder with a small wire-bristle brush.

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in parapraphs 5 and 6 above.

Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

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

Replacement

1. Carefully insert the replacement IC in the circuit boare.

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 Transistor Removal/Replacement

1. 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" with long nose pliers to insure metal to metal contact then solder each connection.

Power Output, Transistor Device Removal/Replacement

1. Heat and remove all solder from around the transistor leads.

2. Remove the heatsink 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 heatsink.

Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicula 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.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).

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

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

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.

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 copper pattern. Solder the overlapped area and clip off any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involoves the installation of a jumper wire on the component side of the circuit board.

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

2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.

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

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SPECIFICATIONS

Note : Specification and others are subject to change without notice for improvement.

¡ Video input system:

PAL-B/G, D/K, I/I SECAM-B/G, D/K,L/L’ NTSC M NTSC 4.43

¡ Intermediate Frequency (Unit : MHz)

VISION IF : 38.9MHz COLOR IF : 34.47MHz(4.43)

35.32MHz(3.58) : NTSC-M VIF-4.25000MHz VIF-4.40625MHz

SOUND IF : 33.4MHz (B/G)

32.9MHz (I/I)

32.4MHz (D/K)

34.4MHz (M)

¡ Power requirement : 110~240V, 50/60Hz

¡ Power consumption : 95

¡ STAND-BY : 3W

¡ Tuning system :

FVS 100 Programme memory 200 Programme memory(W/O TXT)

¡

Antenna input impedance : VHF/UHF 75 ohm, unbalanced

¡ OSD (On Screen Display) : EASY-MENU

¡ Voice coil impedance : 8 ohm

¡ Sound output : 7W¡¿2(MAX)

Dual/Stereo : A2/NICAM(Option)

¡ External connection : Head Phone Jack

A/V in : 2 PERI Connector(Full Scart) : 1 DVD in

¡ External In/Output

Audio-In:0.5Vrms¡ 3dB,over 10Kohm Audio-Out:0.5Vrms¡ 3dBb,below 1Kohm Video-In/Out:1Vp-p¡ 3dB,75ohm DVD In Y: 1Vp-p¡ 3dB

Pb,Pr : 0.7Vp-p¡ 3dB

¡ Feature : Auto programme/Manual programme

CSM (Color Status Memory) Auto Sleep Turbo Picture & Sound Programme Editing PSM (Picture Status Memory) Teletext (TOP/FLOF/LIST) ACMS Auto Volume Level Game SSM(Sound Status Memory) Favorite Program

¡ Tuning range

Band

VHF-Low

VHF-High

Hyper UHF

S1'-S3', S1

S2-S10, S11-S20 S21-S41

For TV

For CATV

B/G

Ch2-4

Ch5-12

D/K

Ch1-5

Ch6-12

I/I

Ch4-13

NTSC

Ch2-13

Ch21-69 Ch14-69

(

): SECAM

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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

Before you use the remote control handset, please install the batteries. See the next page.

1. POWER

switches the set on from standby or off to standby.

2. NUMBER BUTTONS

switches the set on from standby or directly select a number.

3. MENU (or INDEX)

selects a menu. selects an index page in the teletext mode (only TELETEXT models).

4. EYE/*(option)

switches the eye function on or off.

5.

/

(Programme Up/Down)

selects a programme or a menu item. switches the set on from standby. scans programmes automatically.

FF / GG

(Volume Up/Down)

adjusts the volume. adjusts menu settings.

OK

accepts your selection or displays the current mode.

6. Q.VIEW

returns to the previously viewed programme. selects a favorite programme.

7. TELETEXT BUTTONS (option)

These buttons are used for teletext. For further details, see the ‘Teletext’ section.

8. PSM (Picture Status Memory)

recalls your preferred picture setting.

9. TURBO PICTURE / SOUND BUTTON (option)

selects Turbo picture and sound.

POWER

MENU/INDEX

Q.VIEW LIST

0

PR

OK

VOL VOL

PR

231 564 897

TV/AV

TV

I/II/

MUTE

TEXT/MIX

SIZE HOLD

UPDATE TIME REVEAL

PSM SSM/ SLEEP

M

EYE/

TURBO/

()

PICTURE SOUND

/

11 10

11 12

13

14 15

16

2

3 4

5

6

7

8

9

( )

(With TELETEXT)

DECRIPTIONS OF CONTROLS

- 8 -

10. MUTE

switches the sound on or off.

11. TV/AV

selects TV or AV mode. clears the menu from the screen. switches the set on from standby.

12. I/II/*(option)

selects the language during dual language broadcast. (option) selects the sound output.

13. LIST

displays the programme table.

14. SLEEP

sets the sleep timer.

15. SSM/*(option) (Sound Status Memory)

recalls your preferred sound setting.

16. SURROUND (ºº/*) (option)

selects surround sound.

COLOURED BUTTONS : These buttons are used for teletext (only TELETEXT models) or programme edit.

Battery installation

The remote control handset is powered by two AAAtype batteries. To load the batteries, turn the remote control handset over and open the battery compartment. Install two batteries as indicated by the polarity symbols ( and ) marked inside the compartment.

Note : T o 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.

+

-

POWER

MENU

Q.VIEW LIST

0

PR

( )

OK

VOL VOL

PR

2 31 5 64 8 97

TV/AV

I/II/

MUTE

PSM SSM/ SLEEP

PICTURE SOUND

EYE/

TURBO/

/

11 10

11 12

13

14 15

16

2

3 4

5

6

8

9

(Without TELETEXT)

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1. MAIN POWER (ON/OFF)

switches the set on or off.

2. POWER/STANDBY INDICATOR

illuminates brightly when the set is in standby mode. dims when the set is switched on. blinks when signal is input from the remote control.

3. REMOTE CONTROL SENSOR

4. MENU

selects a menu.

5. OK

accepts your selection or displays the current mode.

FF / GG

(Volume Up/Down)

adjusts the volume. adjusts menu settings.

DD / EE

(Programme Up/Down)

selects a programme or a menu item. switches the set on from standby.

6. TV/AV

selects TV or AV mode. clears the menu from the screen. switches the set on from standby.

7. (Function)

selects volume, EYE (option), picture items or brief auto programme while the menus not display .

8. +/- (

DD/EE

)

adjusts the function or selects a programme. switches the set on from standby.

9. AUDIO/VIDEO IN SOCKETS (AV) (option)

Connect the audio/video out sockets of external equipment to these sockets.

Note :If both the input jacks on the front/side panel and back panel have been connected to external equipments simultaneously, only the input jacks on the front/side panel can be received.

10. HEADPHONE SOCKET (option)

Connect the headphone plug to this socket.

11. EYE (option)

adjusts picture according to the surrounding conditions.

12. TURBO SOUND / PICTURE (option)

switches Turbo sound or Turbo picture function on or off.

Note : Do not place any heavy objects (over 4Kg) on the RF/RT-21FA30/31/32 series models.

ON/OFF

MENU OK VOL PR

1 3 4 5 9 10

ON/OFF

MENU

VOL

OK

PR

RF/RT-21FA30/31/32 series

CF/CT-21Q60K/61K/62K series

CF/CT-21Q20K/21K/22K series

CF/CT-21Q64K/65K/66K series

CF/CT-15Q90K/91K/92K series

VIDEO

TV/AV

VOL

PR

AUDIO

AV

L R

ON/OFF

TV/AV (VOL) PR VIDEO

AUDIO

AV

L R

( ) ( )

ON/OFF

TV/AV

VOL

PR

1

2

10

9 6

7 8

2

3

1 2

3

6

7 8

11

1 2 3 6 7 9 10 11

2 3

4 5

1

11

ON/OFF

MENU

VOL SOUND

OK

PR PICTURE

TURBO

DIGITAL TURBO SOUND

CF/CT-21Q90K/91K/92K series

1

2 3 4 11

5

8

VIDEO

RL AUDIO

AV

10

9

VIDEO

L

RAUDIO

AV

10

9

PR

VOLOKMENU

RF/RT-21FA71/72/75/76/79 series

ON/OFF

VIDEO AUDIO

AV

R

L

10

9

1

3 2

4

5

12

ON/OFF

MENUOKVOL

PR

RF/RT-21FB20 series

1

2 3 4 115

VIDEO

L

RAUDIO

AV

10

9

- 10 -

Fig. 2-1

Fig. 2-2

CPT board

Remove Screws

Main PCB

DISASSEMBLY INSTRUCTIONS

Important note

This set is disconnected from the power supply through the converter transformer. An isolating transformer is necessary for service operations on the primary side of the converter transformer.

Back Cabinet Removal

Remove the screws residing on the back cabinet and carefully separate the back cabinet from the front cabinet. (Fig. 2-1).

Chassis Assy Removal

Grasp both side of Frame and pull it backward smoothly.

CPT Removal

1. Pull out the CPT board from the CPT neck.

2. Place the front cabinet on soft material not to mar the front surface or damage control knobs.

3. Remove 5 screws securing the picture tube mounting brackets to the front cabinet.

4. Carefully separate CPT from the front cabinet.

PICTURE TUBE HANDLING CAUTION

Due to high vacuum and large surface area of picture tube, great care must be exercised when handling picture tube. Always lift picture tube by grasping it firmly around faceplate. NEVER LIFT TUBE BY ITS NECK! The picture tube must not be scratched or subjected to excessive pressure as fracture of glass may result in an implosion of considerable violence which can cause personal injury or property damage.

- 11 -

¡ Safety Precautions

1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument.

2. Never disconnect leads while the TV receiver is on.

3. Don't short any portion of circuits while power is on.

4. The adjustment must be done by the correct appliances. But this is changeable in view of productivity.

5. Unless otherwise noted, set the line voltage to 110~240Vac¡ 10%, 50/60Hz.

6. The adjustment of TV should be performed afther warming up for 20 minutes.

¡ Test Equipment required

1. Multimeter (volt meter)

2. Oscilloscope

3. 10:1 PROBE

4. Color Analyzer

¡ CDL Data Adjustment(LINE SVC-0)

1) Press the SVC button to get into the SVC-0 Mode.

2) Press the Channel UP/DOWN button to select CDL12.

3) Press the Volume UP/DOWN button until the CDL data is the same as the Table below.

4) Press the OK(¡Æ) button to memorize the data.

¡ OPTION Data Adjustment(OPTION-1,OPTION-2)

1) Press OK buttons on both TV set and Remote Controller at the same time to get into SVC mode.

2) Press the Yellow button several times to find OPTION-1 or OPTION-2.

3) Input the correspond OPTION data referring to Table below with the numeric buttons.

4) Press the OK(¡Æ) button to memorize the data.

Table 1. OPTION 1 Function

Table 2. OPTION 2 Function

Table 3. OPTION 3 Function

ADJUSTMENT

21” FCD

12

FLAT

14,16” CPT815” CPT

10

FLAT

20,21” CPT

12

CDL Data

Remark

0 1 0 1 0 1 0 1 0 1

SCART

TOP

2 IN 1

DVD

C MUTE

Option Code Function Remark

ACTIVE NOT ACTIVE W/O DVD DVD(REAR JACK) W/O 2 IN 1TUNER WITH 2 IN 1TUNER FLOF TXT TOP TXT PHONO JACK SCART JACK

0 1 0 1 0 1 0 1

EYE

TBS

MONO

4 KEY

Option Code Function Remark

W/O TBS WITH TBS W/O EYE WITH EYE W/O 4 KEY WITH 4 KEY

FORCED MONO

0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

ACMS

T-SCH

T-P/S

CURVE

DUAL

CHA + AU

200 PRO

GAME

BCF

Option

Code

Function Remark

Auto Abnormal ON Not Used W/O GAME PACK WITH GAME PACK 100 PRO 200 PRO

Except China,Austrailia China,Austrailia W/O DUAL WITH DUAL Austrailia Except Austrailia W/O TURBO SEARCH WITH TURBO SEARCH W/O TURBO P/S WITH TURBO P/S NORMAL VOLUME CURVE M-A,India VOLUME CURVE

0 1 0 1 0 1 2 3 4 5 6 7

SYSTEM

HOTEL

RESER

VED

Option

Code

Function Remark

* * *

* * * W/O HOTEL W/HOTEL BG/L BG/I/DK BG/I/DK/M BG/I/DK DUAL BG/I/DK/M DUAL 2nd IF BG 2nd IF I 2nd IF DK

¡ AGC Adjustment (SERVICE 1)

1) Connect RF signal (70dB¡ 0.2dB) and turn on the TV.

¡ Standard adjustment Channel

- EU 05 Ch. (f

rf = 175.25MHz)

2) Press the OK buttons on TV set and Remote Controller at the same time to get into SVC-0 mode.

3) Press the Channel UP/DOWN button on the Remote Controller several times to find AGC??.

4) Press the Volume UP/DOWN button until the AGC Voltage is the same as the Table below.

5) Press the OK(¡Æ) button to memorize the data.

¡ FOCUS Adjustment

1) Tune the TV set to receive a PAL 05CH.

2) Adjust the Focus Volume of FBT for best focus.

¡ Screen Voltage Adjustment

1) Connect the probe of oscilloscope to the RK (Red Cathode) of CPT Board.

2) Set the oscilloscope to 50V/div and 20Us/div and after putting GND line upon the lowest grid line of the scope by pressing GND button,enter into DC mode.

3) Tune the TV set to receive a PAL-B/G 05CH.

4) Adjust Screen Volume of FBT so that the waveform is the same as below figure (DC 140¡ 3V).

¡ White Balance Adjustment.(LINE SVC-0)

NOTE : This adjustment should be performed after screen voltage

adjustment.

1) Tune the TV set to receive an 100% white pattern.

2) Press OK(¡Æ) buttons on TV set and remote controller at the same time to get into SVC mode.

3) Press Yellow button on remote controller. (Standard mode)

4) Press Channel UP/DOWN button for desirous function adjustment.

5)

Adjust VOL+ or VOL-button in each status of "RG--"/"BG--" for X=272

¡ 8

, Y=288

¡ 8

with color analyzer.(Europe Model

:

X=288

¡ 8

, Y=295¡X=272

¡ 8

, 11,000K)

7) Press the OK(¡Æ) button to memorize the data.

Test Point : AGC TP (C101) Adjust : Remote Controller

- 12 -

Tuner P/N

Marker

AGC Voltage

6700VPF009G

LG Innotek(W/S TUNER)

2.7¡ 0.05V

6700VPF016A

DAEWOO(W/S TUNER)

2.7¡ 0.05V

Tuner P/N

Marker

AGC Voltage

6700VPF009S

LG Innotek(TBS TUNER)

2.5¡ 0.05V

Test Point : Observing Display Adjust : Focus Volume of FBT

Test Point : RK (Red Cathode of CPT Board) Adjust : Screen Volume of FBT

Status

RG GG BG

BLO-R

BLO-G

Initial Data

31 31 31 31 31

Remark

0 1 2

3 0 1 2 3 0 1 0 1 2 0 1 2 3 0

0 1 0 1

OSD-L

(E-ASIA)

OSD-L

(CH+HI)

English

English,Deutsch,Francais,Italiano,Espanol

English,Nederlands,Svenska,Dansk,Suomi,Por

tugues,Romaneste,Polski,Cesky,Pyccknn

English,Romaneste,Polski,Cesky,Pyccknn,Magyar

English English,Arab,,Urdu,French English,Parsi,Urdu,French

English,French,Arab,Urdu,Parsi

English

English,Malay,Vietnam,Indonesian,Thai

English

English,Chinese

English,Hindi

TXT-L

(EU)

TXT-L

(E-ASIA)

TXT-L

(ARAB)

TXT-L

(FARSI)

OSD-L

(EU)

OSD-L

(M-

ASIA)

Option

Code

Function Remark

ENG. ONLY EU-7EA EU ALL

EU EAST ENG. ONLY ARABIC PARSI ARAB,FARSI,URDE ENG.ONLY ASIA-ALL ENG.ONLY E+CHINA E+HINDI W-EU E-EU CYRILLIC UKRAINIAN WEST-EU

WEST-EU ARABIC WEST-EU FARSI

14”

DC 130V

¡ 3V

OTHERS

DC 140V

¡ 3V

- 13 -

¡ Deflection Data Adjustment (Line SVC-1)

NOTE: To enter SVC mode, press "OK" buttons on both TV set

and the Remote control at the same time.

1. Preparation for Deflection Adjustment

1) At SVC mode, press the Yellow colored button. And then, deflection data adjustment OSD (SVC1 mode) will be displayed.

2) Tune the TV set to receive a PAL 05 CH.

2. Deflection Initial Setup Data

3. Deflection Adjustment Procedure

VL (Vertical Linearity)

Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.

VA (Vertical Amplitude)

Adjust so that the circle of a digital circle pattern may be located within the effective screen of the CPT.

SC (Vertical “S” Correction)

Adjust so that all distance between each horizontal lines are to be the same.

VS (Vertical Shift)

Adjust so that the horizontal center line of a digital circle pattern is in accord with geometric horizontal center of the CPT.

HS (Horizontal Shift)

Adjust so that the vertical center line of a digital circle pattern is in accord with geometric vertical center of the CPT.

Press the OK(¡Æ) button to memorize the data.

VL VA VS HS SC

31 31 31 31 25

Status Default 21" FLAT S/S 21" FLAT LG

- 14 -

PURITY & CONVERGENCE ADJUSTMENT

Caution:

Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. However, the effects of adjacent receiver components, or replacement of picture tube or deflection yoke may require the need to readjust purity any convergence.

¡ Purity Adjustment

This procedure DOES NOT apply to bonded yoke and picture tube assemblies. The instrument should be at room temperature (60 degrees F or above) for six (6) hours and be operating at low beam current (dark background) for approximately 20 to 30 minutes before performing purity adjustments.

CAUTION: Do not remove any trim magnets that may be

attached to the bell of the picture tube.

1. Remove the AC power and disconnect the internal degaussing coil.

2. Remove the yoke from the neck of the picture tube.

3. If the yoke has the tape version beam bender, remove it and replace it with a adjustable type beam bender (follow the instructions provided with the new beam bender)

4. Replace the yoke on the picture tube neck, temporarily remove the three (3) rubber wedges from the bell of the picture tube and then slide the yoke completely forward.

5. Reconnect the internal degaussing coil.

6. Position the beam bender locking rings at the 9 o'clock position and the other three pairs of tabs (2,4 and 6 pole magnets) at the 12 o'clock position.

7. Perform the following steps, in the order given, to prepare the receiver for the purity adjustment procedure.

a. Face the receiver in the "magnetic north" direction.

b. Externally degauss the receiver screen with the television

power turned off.

c. Turn the television on for approximately 10 seconds to

perform internal degaussing and then turn the TV off.

d. Unplug the internal degaussing coil. This allows the

thermistor to cool down while you are performing the purity adjustment. DO NOT MOVE THE RECEIVER FROM ITS "MAGNETIC NORTH" POSITION.

e. Turn the receiver on and obtain a red raster by increasing

the red bias control (CW) and decreasing the bias controls for the remaining two colors (CCW).

f. Attach two round magnets on the picture tube screen at 3

o'clock and 9 o'clock positions, approximately one (1) inch from the edge of the mask (use double-sided tape).

X-AXIS YOKE POSITIONING (L/R PURITY)

6-POLE MAGNETS

CONVERGENCE MAGNET ASSEMBLY

- 15 -

8. Referring to above, perform the following two steps: a. Adjust the yoke Z-axis to obtain equal blue circles. b. Adjust the appropriate beam bender tabs to obtain correct

purity (four equal circles).

9. After correct purity is set, tighten the yoke clamp screw and

remove the two screen magnets.

10. Remove the AC power and rotate the receiver 180 degrees

(facing "magnetic south").

11. Reconnect the internal degaussing coil.

12. Turn the receiver on for 10 seconds (make sure the receiver

came on) to perform internal degaussing, and then turn the receiver off.

13. Unplug the internal degaussing coil.

14. Turn on the receiver and check the purity by holding one (1)

round magnet at the 3 o'clock and a second round magnet at 9 o'clock position. If purity is not satisfactory, repeat steps 8 through 14.

15. Turn off the receiver and reconnect the internal degaussing

coil.

¡ Convergence Adjustment

Caution: This procedure DOES NOT apply to bonded yoke and

picture tube assemblies. Do not use screen magnets during this adjustment procedure. Use of screen magnets will cause an incorrect display.

1. Remove AC power and disconnect the internal degaussing

coil.

2. Apply AC Power and set the brightness to the Picture Reset

condition. Set the Color control to minimum.

3. Make a horizontal line.

4. Adjust the Red, Green and Blue Bias controls to get a dim

white line.

5. Restore the screen by removing the horizontal line.

6. Reconnect the internal degaussing coil and apply AC power.

7. Turn the receiver on for 10 seconds to perform internal degaussing and then turn the receiver off again.

8. Unplug the internal degaussing-coil.

9. Turn on the receiver, connect a signal generator to the VHF antenna terminal and apply a crosshatch signal.

Caution: During the convergence adjustment procedure, be

very careful not to disturb the purity adjustment tabs are accidentally move, purity should be confirmed before proceeding with the convergence adjustments.

Note:

Make sure the focus is set correctly on this instrument

before proceeding with the following adjustment.

10. Converge the red and blue vertical lines to the green vertical line at the center of the screen by performing the following steps (below TABLE). a. Carefully rotate both tabs of the 4-pole ring magnet

simultaneously in opposite directions from the 12 o'clock position to converge the red and blue vertical lines.

b. Carefully rotate both tabs of the 6-pole ring magnet

simultaneously in opposite directions form the 12 o'clock position to converge the red and blue (now purple) vertical lines with the green vertical line.

11. Converge the red and blue horizontal with the green line at the center of the screen by performing the following steps. (below TABLE)

a. Carefully rotate both tabs of the 4-pole ring magnet

simultaneously in the same direction (keep the spacing between the two tabs the same) to converge the red and blue horizontal lines.

b. Carefully rotate both tabs of the 6-pole ring magnet

simultaneously in same direction (keep the spacing between the two tabs the same) to converge the red and blue (now purple) horizontal lines with the green horizontal line.

c. Secure the tabs previsouly adjusted by locking them in

place with the locking tabs on the beam bender.

- 16 -

12. While watching the 6 o'clock positions on the screen, rock the front of the yoke in a vertical (up/down) direction to converge the red and blue vertical lines. (Fig upper left)

13. Temporarily place a rubber wedge at the 12 o'clock position to hold the vertical position or the yoke.

14.

Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue horizontal lines are converged. If the lines are not converged, slightly offset the vertical tilt of the yoke (move the rubber wedge if necessary) to equally balance the convergence error of the horizontal lines at 3 o'clock and 9 o'clock and the vertical lines at 6 o'clock and 12 o'clock.

15. Place a 1.5 inch piece of glass tape over the rubber foot at the rear of the 12 o'clock wedge.

16. While watching the 6 o'clock and 12 o'clock areas of the screen, rock the front of the yoke in the horizontal (left to right) motion to converge the red and blue horizontal lines. (Fig. upper right)

17. Temporarily place a rubber wedge at the 5 o'clock and 7 o'clock positions to hold the horizontal position of the yoke.

18. Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue vertical lines are converged. If the lines are not converged, slightly offset the horizontal tilt of the yoke (move the temporary rubber wedges if necessary) to equally balance the convergence error of the horizontal lines at 6 o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9 o'clock.

19. Using a round magnet confirm purity at the center, right and left sides and corners. See Purity Adjustment Procedure.

20. Reconfirm convergence and apply a 1.5 inch piece of glass tape over the rubber foot at the rear of the 5 o'clock and the 7 o'clock wedges.

UP/DOWN ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED AND BLUE RASTERS

LEFT/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE SIZE CHANGE OF THE RED AND BLUE RASTERS

- 17 -

BLOCK DIAGRAM

DVD

(FLAT OPT.)

R.G.B AMP. &

CPT DRIVE

(TDA6107Q)

FBT

185V

-14V

AFC

ABL

HEATER

B+

HDT

Collector

A1(R/L)-IN

SPK(R/L)-OUT

UOC

TDA9361(TXT)

H/P AV-IN

AUDIO B+

B+

(110/115V)

(14/17V)

SMPS

TRANS

SPK.

Front-AV(2)

(MNT/TV-OUT)

14V

H-out

IFout

Int.

CVBS

SCL

SDA

EXT

Video-in

RGB

OUT

IK

H-Vcc

VIDEO

TUNER

V_DY

VERTICAL AMP

LA7840

Va

Rear_AV(1)

SCART / PHONE)

(

IC03

EEPROM

24C08/16

A(R/L)-OUT

V-OUT

EXT.RGB

Vb

Va

Vb

SPK.

9.5V

5V

From

IC131

A1/A2(R/L)-IN

Y/Pb/Pr

DVD(R/L)-IN / Game Audio

MNT/TV-A(R/L)-OUT

SIF

FM-SIF-IN

SW1

SW2

SDA

SCL

MSP3410D

TDA9859

AV STEREO

RF STEREO

MONO

SOUND AMP

TDA2006

AC

INPUT

(110~240V)

STEREO,

Sound Max

SOUND AMP.

TDA7266/97

STEREO,

Sound Max

SOUND AMP.

TDA7266/97

IC131

5V REG

Option Part

IIC Bus Line

TDA9381(Non-TXT)

Audio(Mono)

(TV OUT)

28 33

21

22

38

Sound

Trap Part

Video-OUT(TV/MNT OUT)

50 4251~53

°‹

STEREO

( ~B01K

~ A13P)

MONO

( ~B01L )

10

12

9

5

3

9

8

10

2

6

14V

1

ST-BY

TRANS

(3W Opt)

°‹

SPK(L)-OUT

°‹

24

25

4744

AUDIO

AM-IN

(L/L Only)

303931

40

28

30

14 39

8V

From IC844

14 39 39

3.3V Reg.

5V

From

IC842

3.3V

°‹ °‹

8V

From

IC844

8V REG

IC842

5V REG

41 42

1

32

IC02

IC631

IC661

5V

5.1V

SFE 5.74M

32 SIF

SIF(CE Mono)

From Tuner

°‹

35

EXT

Audio-in

°‹

IC651

LA7016(Mono Opt)

7

2

TV Audio(From UOC #28)

/ Game Audio (From HIC01)

4

MNT Audio Out(Mono)

TV Audio Out (CL Mono)

°‹

LA7016(DVD / GameOpt)

IC591

)

2

DVD Y / Game Video

4 7

EXT Video

PJ201

EXT Video(To UOC #42)

HIC01

Game Pack(Game Opt)

3, 4, 5 1 2

From UOC

Video(Game) Audio(Game)

PJ202

15 18

44

Audio Out

TO

IC631

#1,#5

Thai

Opt.

°‹

- 18 -

EXPLODED VIEW

120

124

123

174

520

913

170

150

153

112

530

330

320

700

540

943

400

300

310

550

121

600

501

- 19 -

EXPLODED VIEW PARTS LIST

LOCA. NO PART NO DESCRIPTIONS

112 6341V21009B CPT ASSY A51QDX992X DY SEOUNG CHANG

6341V21010A CPT ASSY 2426GDB30CA 21” FCD

6334V21004B CPT ASSY A51QAD992X 0G 2426GDB30CH CPT A51QDJ279X 2426GDB30CD CPT A51QDJ279X

120 120-D38C SPEAKER,MID-RANGE 8 OHM 15/25W 87 128*77 121 6400VG0002A SPEAKER,TWEETER T0520101(C76G) 8 OHM 10 123 4810V00267A BRACKET,SPK PP

4810V00267B BRACKET,SPK PP CKD

124 4810V00124A BRACKET,PP COVER 150 150-D02X COIL,DEGAUSSING CU 21” 60TURN 12 OHM 153 6150V-1014G DY QPC-E5409A 21” SENGCHANG S/S F

6150V-1019C DY DIF-2192AA(NF5)

6150Z-1223A DY DC21SPFL3 21” FCD 170 170-A01N CPT EARTH 21” 64T 2LUG 1P HSG 174 174-009Q POWER CORD(W/HOLD,HOUSING)L=300,4.0

6410VEH001G POWER CORD 300 3091V00439B CABINET ASSY LG FLAT 310 5020V00657A BUTTON,CONTROL 320 320-062E SPRING,KNOB 330 5020V00656A BUTTON,POWER 400 3809V00296A BACK COVER ASSEMBLY DVD

3809V00296C BACK COVER ASSEMBLY CKD DVD 3809V00296D BACK COVER ASSEMBLY 1SCART

3809V00296L BACK COVER ASSEMBLY 1SCART 3809V00296F BACK COVER ASSEMBLY 21FB20RQ W/LABEL 3809V00296M BACK COVER ASSEMBLY 21FB20RW

501 4810V00555A BRACKET, MAIN RT-21FB20(407AF)

4810V00555B BRACKET, MAIN RT-21FB20(60HR)

520 6871VMM886B PWB ASSY,MAIN 019A RT-21FB20VQ

6871VMM886C PWB ASSY,MAIN 019A RT-21FB20VE

6871VMMA26R PWB ASSY,MAIN 019A RT-21FB20VE SCART

6871VMM886E PWB ASSY,MAIN 019A RT-21FB20VQ SKD 6871VMM886J PWB ASSY,MAIN 019A RT-21FB20VE CKD 6871VMM886P PWB ASSY,MAIN 019A RT-21FB20V 6871VMM886N PWB ASSY,MAIN 019A RT-21FB20R 6871VMM792V PWB ASSY,MAIN 019A RT-21FB20VQ SCART

6871VMM792W PWB ASSY,MAIN 019A RT-21FB20RQ

6871VMM792Y PWB ASSY,MAIN 019A RT-21FB20VQ 6871VMM886S PWB ASSY,MAIN 019A RT-21FB20RX 6871VMMN18L PWB ASSY,MAIN 019A RT-21FB20RW 6871VMM815C PWB ASSY,MAIN 019A RT-21FB20VE SKD 6871VMMA89P PWB ASSY,MAIN 019A RT-21FB20VE CKD 6871VMM767J PWB ASSY,MAIN 019A RF-21FB20RE CKD

540 6871VSM962W PWB ASSY,SUB (019A) FB20 POWER BOARD

6871VSMB16C PWB ASSY,SUB (019A) FB20 POWER BOARD 6871VSMB16F PWB ASSY,SUB (019A) FB20 POWER BOARD 6871VSMD38J PWB ASSY,SUB (019A) FB20 POWER BOAR

550 6871VSM962X PWB ASSY,SUB (019A) FB20 KEY CONTROL

6871VSMB16D PWB ASSY,SUB (019A) FB20 KEY CONTROL 6871VSMB16G PWB ASSY,SUB (019A) FB20 KEY CONTROL 6871VSMD38K PWB ASSY,SUB (019A) FB20 KEY CONTROL

600 6871VSM963T PWB ASSY,SUB (019A) FB20 SIDE-AV(HP&STE

6871VSMB15M PWB ASSY,SUB (019A) FB20 SIDE-AV(HP&S 6871VSMB16E PWB ASSY,SUB (019A) FB20 SIDE-AV

6871VSMB16H PWB ASSY,SUB (019A) FB20 SIDE-AV 700 0IGL120104A IC,CDS SENSOR MODULE(P1201-04) 913 332-057B SCREW ASSY,HEXAGON HEAD 943 1PTF0403116 SCREW,TAP TITE(P)D4.0 L16.0 MSWR3/FZB

The components identified by mark is critical for safety. Replace only with part number specified.

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