LG RT-29FA30V, RT-29FA30RX, RT-29FA30RU Service Manual

COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MC-007C

MODEL:RT-29FA30V/RX/RU

website:http://biz.LGservice.com

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

- 2 -

CONTENTS

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

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

Specifications ..................................................................................................... 4

Control Descriptions ........................................................................................ 5

Disassembly Instructions ............................................................................. 8

Adjustment Instructions ............................................................................... 9

Exploded View .................................................................................................. 24

Exploded View Parts List .............................................................................25

Replacement Parts List ............................................................................... 26

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

- 3 -

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.

1.5 Kohm/10W

To Instrument's
exposed
METALLIC PARTS

Good Earth Ground
such as WATER PIPE,
CONDUIT etc.

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

- 4 -

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(AV)

● Intermediate Frequency (Unit : MHz)

VISION IF : 38.9MHz,33.9MHz(SECAM-L’)
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,L)

34.4MHz (M)

40.4MHz (L’)

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

● Power consumption : 25”:125W

29”:135W

● CPT : True Flat CPT(Flatron)

● Tuning system :

FVS
100 Programme memory
200 Programme memory(For CHINA)

●

Antenna input impedance : VHF/UHF 75 ohm, unbalanced

● OSD (On Screen Display) : MENU Type

● Voice coil impedance : 8 ohm

● Sound output : 12W+12W

Dual/Stereo : A2/NICAM(Option)

● External connection :

Head Phone Jack
S-VIDEO in
A/V in :1 pair
Scart 1(Full)
A/V in/out
Scart 2(Half)+Audio out
A/V in/out

● External In/Output

Audio-In:0.5Vrms±3db,over 10Kohm
Audio-Out:0.5Vrms±3db,below 1Kohm
Video-In/Out:1Vp-p±3db,75ohm
R,G,B In:0.7Vp-p±3db

● Feature : Auto programme/Manual programme

SVM (Scanning Velocity Modulation)
Digital Eye
Digital Comb Filter
Auto Sleep
Dynamic Focus
Programme Editing
PSM (Picture Status Memory)
CTI
Double Window Teletext (TOP/FLOF)
Turbo Search, Picture & Sound
ACMS
ARC (Zoom 1/ZOOM 2, 16:9↔4:3)
1 TUNER PIP(Double Window PIP)

Child Lock :

● 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

In the Lock On state the TV can only be
operated by the Remote Controller.
If any button on the front panel is pressed,
"Child Lock" is displayed on the screen but
the button's function is not performed.
To cancel of this mode, select lock off with
menu button on remote controller only.

(

): SECAM

Front or

Side

Back

- 5 -

DESCRIPTION OF CONTROLS

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

selects a menu.

4.

DD / EE

(Programme Up/Down)

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

FF / GG (Volume Up/Down)

adjusts the volume.
adjusts menu settings.

OK

accepts your selection or displays the current mode.

5. VCR BUTTONS (option)

control a LG video cassette recorder.

6. SSM (Sound Status Memory)

recalls your preferred sound setting.

7. PSM (Picture Status Memory)

recalls your preferred picture setting.

8. EYE/*(option)

switches the eye function on or off.

9. TELETEXT BUTTONS (option)

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

10. MUTE

switches the sound on or off.

11. ARC (Aspect Ratio Control)

changes the picture format.

12. TV/AV

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

13. TURBO PICTURE / SOUND BUTTON

selects Turbo picture / sound.

TEXT/EYE/

Q.VIEW

?

MIX

TIME

REVEAL SLEEP

i

M

(With teletext / Without PIP)

(With teletext / PIP)

TV/AV

SOUND

PICTURE

TURBO

ARC

MUTE

POWER

MENU

PR

VOL

PR

VOL

OK

PLAY

P/STILL

LIST

STOP

REC

REW FF

I/II

TEXT/ PIPEYE/

PR- PR+ SWAP INPUT

SSM

PSM

1 2 3

4 5 6

7 8 9

0

?

MIX

TIME

REVEAL SLEEP

SIZE

STILL

POSITION

9/4PIP

i

M

2

11

1

4

5

7

8

9

12

10

16

14

15

13

17

6

3

9

18

18

- 6 -

0

231

564

897

POWER

MENU

LIST

ARC I/II

SSM

SLEEP

PSM

SOUNDPICTURE

Q.VIEW

PR

OK

VOL VOL

PR

TV/AV

MUTE

TURBO

EYE/

14. LIST

displays the programme table.

15. I/II

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

16. PIP BUTTONS (option)
PIP

switches the sub picture on or off.

PR +/

-

selects a programme for the sub picture.

SWAP

alternates between main and sub picture.

INPUT

selects the input mode for the sub picture.

SIZE

adjusts the sub picture size.

STILL

freezes motion of the sub picture.

POSITION

relocates the sub picture in clockwise direction.

9/4 PIP

switches on or off the 9 or 4 sub pictures.

17. SLEEP

sets the sleep timer.

18. SWAP or Q.VIEW
returns to the previously viewed programme.

COLOURED BUTTONS

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

Battery installation

The remote control handset is powered by two AAA or AA type 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 : 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.

+

-

AAA AA

10

(Without teletext / PIP)

1

2

4

3

18

11

8

7

13

12

3

15

14

6

- 7 -

1. MAIN POWER

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.

3. REMOTE CONTROL SENSOR

4. MENU

selects a menu.

5. TV/AV

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

6. OK

accepts your selection or displays the current
mode.

7. (Function)

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

8.

DD / EE

(Programme Up/Down)

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

FF / GG (Volume Down/Up)

adjusts the volume.
adjusts menu settings.

9. +/- (

DD/EE

)

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

10.AUDIO/VIDEO IN SOCKETS (AV3)

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

S-VIDEO/AUDIO IN SOCKETS (S-AV) (option)

Connect the video out socket of an S-VIDEO
VCR to the S-VIDEO socket.
Connect the audio out sockets of the S-VIDEO
VCR to the audio sockets as in AV3.

11.HEADPHONE SOCKET (option)

Connect the headphone plug to this socket.

12.EYE (option)

adjusts picture according to the surrounding
conditions.

Note : Do not place any heavy objects (over 4Kg)
on the RT-29FA30/33 series models.

Front panel

MENU

OK

VOL

PR

POWER

MENU O K

VOL

PR

STAND BY

POWER

1

1 2 3 1246 8

4 6 8 2 3 12

POWER

TV/AV

AV3

VIDEO AUDIO

VOL

PR

L/MONO R

S-VIDEO

VIDEO

(L/MONO)

AUDIO

AV3

R

L

Side Panel

S-VIDEO

VIDEO

L/MONO RAUDIO

AV3

11

10

10

11

VIDEO

AUDIO

L

R

MONO

AV3

11

10

CT-29Q26/27 series CT-25Q26/27 series

CT-25/29H46/47 series

CT-25/29H36/37 series

CT-29K36/37 series

POWER

MENU

STAND-BY

OK VOL PR

AV3

VIDEO (L/MONO) AUDIO (R)

POWER

MENU OK VOL PR

1 46 8 2 3 12

1 2 3 5 7 10 11 129

POWER

TV/AV

VOL PR

CT-29M30/32 series

1 2 3 5 7 9

1 2 3 4 6 8 10 12

RT-29FA30/33 series

ON/OFF

MENU OK VOL PR

1 246 8 11 12103

- 8 -

Fig. 2-1

Fig. 2-2

CPT
PCB

Remove
Screws

STEREO
PCB

Main PCB

VCD
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 4 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.

- 9 -

O 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.

5. Unless otherwise noted, set the line voltage to 230Vac

!10%,

50Hz.

5. The adjustment of TVshould be performed after warming up

for 15 minutes.

O Test Equipment required

1. RF signal generator (with pattern generator)

2. DC Power Supply

3. Multimeter (volt meter)

4. Oscilloscope

5. Color analyzer

O

PIF (Picture Intermediate Frequency) Adjustment

1) Connect the measuring equipment to the Main Board as

shown in Fig.1.

2) Set RF frequency and output level of RF SIGNAL

GENERATOR as shown Table 1.

3) Turn off S1 and S3 and on S2.

4) Adjust L104 so that the DC voltage may be 2.4!0.05Vdc.

(Table 1)

O L’ VCO Adjustment (For SECAM-L’ MODEL)

1) Connect the measuring equipment to the Main Board as
shown in Fig.1.

2) Set RF frequency and output level of RF SIGNAL
GENERATOR as shown Table 1.

3) Turn on S1,S3 and off S2.

2) Adjust VR122 so that the DC Voltage may be 2.4!0.05Vdc.

O

RF AGC (Automatic Gain Control) Adjustment

1) Input PAL-B/G 05 CH.

2) Connect Multimeter to TP2(J15),AGC adjustment point.

3) Adjust VR121 until the voltage of Multimeter becomes

2.5!0.1V.

OScreen Voltage Adjustment

1) Tune the RF Modulator to receive a PAL or SECAM signal.

2) Press MIX button on remote controller for Service to get into
the Screen Adjust Mode.

3) Adhere the Color Analyzer on the White window of CPT
face.

4) Adjust Screen Volume of FBT so that the luminance of White
window is 12!1 FL.

OFocus Adjustment

1) Tune the TV set to receive a digital pattern.

2) Adjust the upper Focus volume of FBT for the best focus of
vertical line B.

3) Adjust the lower Focus volume of FBT for the best focus of
area A.

4) Repeat above step 2) and 3) for the best overall focus.

IC101

TDA4470

TP1(VCO)

IC102(KI7805)

22

7

13

14

1

0.01uF

JP1

L104

9V

Power­Supply

V Multimeter or Oscilloscope

JP2

38.9MHz

34.25MHz

(B/G,D/K,I,L)
(SECAM-L')

100 ohm

S1

5V

4.7 Kohm

S3

S2

JP3

100 ohm

Q122

VR122

R108

R144

Test Point : TP1

Adjust : L104

Test Point : TP1

Adjust : VR122

Frequency

38.9MHz

34.25MHz

System

B/G,D/K/I,SECAM-L

SECAM-L’

Modulation

OFF

OFF

Output level

10mVp-p

10mVp-p

Adjust

L104

VR122

Fig. 1 : Connection Diagram of Equipment for PIF Adjustment

ADJUSTMENT INSTRUCTIONS

Test Point : TP 2(J15)

Adjust : VR121

Test Point : CPT Face

Adjust : Screen Control of FBT

Test Point : Observing Display

Adjust : Focus control of FBT

- 10 -

O Deflection Data Adjustment (Line SVC-2)

NOTE : How to enter into the Line Service Mode with a remocon.

1.Power off.

2.Press the Red button.

3.Press the Green button.

4.Press the Yellow button.

5.Press the Cyan button.

6.Press the OK button.

7.Power On.

1. Preparation for Deflection Adjustment

1) At SVC mode, press the Yellow colored button the SVC
remocon.
And then,deflection data adjustment OSD(SVC2 mode) will
be displayed.

2) Press Channel UP/DOWN button for desirous function
Adjustment.

3) Press Volume UP/DOWN button to adjust the data.

4) Tune the TV set to receive a PAL B/G Digital pattern.

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.

EW (Horizontal Width)

Adjust to that a digital circle pattern looks like exact circle.

EP (East-west Parabolar)

Adjust so that middle portion of the outermost left and right
vertical line looks like parallel with vertical lines of the CPT.

EC (East-west Coner)

Adjust so that the vertical line at every 4 corners of the
screen looks like parallel with the vertical lines of the CPT.

ET (East-west Trapezium)

Adjust to make the length of top horizontal line same with
it of the bottom horizontal line.

BOW

In line adjustment, not to change default value is basic.

ANG

In angle adjustment, adjust until inclination of left and right
screen should be precise.

POP (POP Position)

Adjust until the distance between POP and main picture
becomes about 1mm.

(Table 2)

O White Balance Adjustment.(LINE SVC 1)

NOTE : This adjustment should be performed after screen

voltage adjustment.

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

2) Press the Yellow button on remote controller in the SVC
Mode.

3) Press PSM (RED) button on remote controller. (Standard
picture)

4) Press PR+ or PR- button for desirous function adjustment.

5) Adjust Low Light status of CR and CB with VOL+ or VOL­at CG:50 until X=268!

8,Y=273!8.

6) Adjust High Light status of RG and BGB with VOL+ or
VOL- at CG:370 until X=268!

8,Y=273!8.

7) Repeat above step 5) and 6) until each status of High Light
and Low Light.( for Europe Model: X=288!

8,Y=295!8,

color temperature 9000

o

K).

b

A

B

Fig. 2

Menu

VS

VA

VL

SC

HS

EW

ET

EP

ES

EC

BOW

ANGLE

POP P

0600H~0900H

0050H~00CFH

0025H~00BFH

0000H~009FH

0000H~003FH

0400H~0EFFH

0700H~08FFH

06E0H~0840H

06A0H~0AFFH

0790H~08E0H

FF00H~00FFH

FF00H~00FFH

0790H~08E0H

07BE

0088

00FF

00D9

000D

0A49

0803

078C

0815

0850

0000

0000

0009

Range 29” Flat 29” S-Flat

- 11 -

(Table 3)

OSVC Data & PSM,SSM Data.

Table 1. ABL Data (LINE SVC-3)

Table 2. SOUND PRE-SCALER (LINE SVC-4)

Table 3. PSM Data

Menu

DVCO

IBRM

WDRM

BCLTH

BCLTM

BCLGA

SVGA

SVDEL

SVD1

LDLY

HBST

HBSO

0~1FFH

0~3FFH

0~7FFH

0~1FFH

0~1FFH

0~01FF

0~01FF

00C8

0190

0060

000B

000A

0003

0005

0003

FFFE

00F0

0158

Range 29” Flat 29” S-Flat

Menu

FP

NP

SP

S1 VOL

S2 VOL

DVD

0~127

0~127

0~127

0~127

0~127

1

0011

0045

001E

0042

0042

Range DATA

Mode

CONTRAST

BRIGHT

COLOR

SHARPNESS

90

50

50

50

100

55

60

60

60

60

40

30

50

60

40

30

STANDARD DYNAMIC MILD GAME

Menu

CR

CG

CB

RG

GG

BG

0 ~ 511

0 ~ 511

0 ~ 511

0 ~ 511

0 ~ 511

0 ~ 511

80

80

80

370

370

370

Range

DATA

O OPTION Adjustment (LINE-SERVICE OPTION)

Table 4. OPTION Function

- 12 -

OPTION

DVD

GAME

TEXT

TOP

ACMS

CH+AU

EYE

TURBO

SCART

A2 ST

I II SV

MONO

VOL

H-PH

DGS

TILT

200PRO

AV2

HOTEL

KEY

SYS

M-VOL

OSD

T-LAN

1

DVD

GAME

TEXT

TOP

China,Australia

EYE

Turbo Search

SCART

STEREO

I/II

MONO

Middle East Africa,India VOL.

H/Phone

Degaussing

TILT

China Only

Back:JACK(2EA)

HOTEL

0

X

X

X

X

Australia Only

X

X

X

X

X

X

Normal VOL.

X

X

Back:JACK(1EA)

X

Option 1

Option 2

Option 3

Option 4

Menu