LG 29FS4ALX-RLX Service Manual

COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : CW62A

MODEL: 29FS4ALX/RL/RLX

MODEL:

29FS4ALX/RL/RLX-ZG

website:http://biz.LGservice.com

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

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CONTENTS

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

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

Control Descriptions..........................................................................................4

Specifications........................................................................................................7

Adjustment Instructions .................................................................................8

Trouble Shooting ................................................................................................14

Printed circuit board.........................................................................................18

Block Diagram .....................................................................................................20

Exploded View....................................................................................................22

Exploded View Parts List .............................................................................23

Replacement Parts List .................................................................................24

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 isolation 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 circuitry 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 position, 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 exposed 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 specified, 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

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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.

DD / EE

(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.

accepts your selection or displays the current mode.

5. TELETEXT BUTTONS (option)

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

SLEEP

sets the sleep timer.

7. 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.

(With TELETEXT / PIP)

POWER MUTE

123

456

789

TV/AV

VOLVOL

SWAP

INPUT

PR+

PR-

TEXT/MIX/

SIZE/

PIP 9/4PIP i

POSITION/

STILL/

REVEAL/

SLEEPMODE/

EYE

TIME/

FAVOURITE

I/II/

8 9

(With TELETEXT / Without PIP)

TEXT/MIX/

SLEEPMODE/

Q.VIEW

SIZE/

TIME/

UPDATE/

INDEX/ i

FAVOURITE

REVEAL/

LIST

HOLD/

I/II/

EYE/

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8. FAVOURITE

selects a favorite programme.

EYE/

(option)

switches the eye function on or off.

10. MUTE

switches the sound on or off.

11. TV/AV

selects TV or AV mode. switches the set on from standby. exits the Teletext mode

12.

I/II/

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

13. Q.VIEW (or YELLOW)

returns to the previously viewed programme.

14.

LIST (or BLUE)

displays the programme table.

: No function

COLOURED BUTTONS : These buttons are used for teletext (only

TELETEXT models) or programme edit.

(Without TELETEXT / PIP)

VOLVOL

SWAP INPUT

PR+PR-

SLEEP

FAVOURITE

POSITION

9/4PIP

STILL

PIP

SIZE

EYE/

I/II/

(With PIP / Without TELETEXT)

POWER MUTE

123

456

789

TV/AV

VOLVOL

SLEEP

FAVOURITE

EYE/

I/II/

Q.VIEW

LIST

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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.

3. MENU

selects a menu.

4. OK

accepts your selection or displays the current mode.

FF / GG

(Volume Down/Up)

adjusts the volume. adjusts menu settings.

DD / EE

(Programme Up/Down)

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

5. REMOTE CONTROL SENSOR

Note : Only use the supplied remote control handset. (When you use others, they’ll be not able to function.)

6. AUDIO/VIDEO IN SOCKETS (AV IN3)

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

7. EYE (option)

adjusts picture according to the surrounding conditions.

Front panel

Side panel

VIDEO L/MONO RAUDIO

AV IN3

ON/OFFON/OFF

275

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SPECIFICATIONS

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

V Scope

This specification can be applied to all the television related to CW62A Chassis.

V Test and Inspection Method

1) performance : Follow the Standard of LG TV test

2) Standards of Etc. requirement

- Safety: IEC60065

- EMC: EN55020,EN55013

V Test Condition

1) Temperature : 20 ± 5°C(CST : 40 ± 5°C)

2) Relative Humidity : 65

± 10%

3) Power voltage : AC110-240V~, 50/60Hz

4) Follow each drawing or spec for spec and performance of parts,based upon P/N of B.O.M

5) Warm up TV set for more than 20min. before the measurement.

Item

Receiving System

Available Channel

Input Voltage

Market

Screen Size

Tuning System

Operating Environment

Storage Environment

Remark

EU/ Non EU

OPTION

Non EU/ EU

NTSC-M

Non EU

200 PR(W/O TXT)

Specification

PAL,SECAM BG

PAL/SECAM DK

PAL-I/I

NTSC M

NTSC 4.43(AV)

SECAM-L/L’

NTSC M/ PAL M/N

VHF : E2 ~ E12

UHF : E21 ~ E69

CATV : S1 ~ S20

HYPER : S21 ~ S41

VHF : 02 ~ 13

UHF : 14 ~ 69

CATV : 02 ~ 13

AC 110-240V, 50/60Hz

AC 230V, 50/60Hz

EU,CIS, China, Asia, Africa

Flat 29”

FVS 100Program

1) Temp : 0 ~ 45 deg

2) Humidity : below 85%

1) Temp : -20 ~ 60 deg

2) Humidity : below 85%

V General Specification

1. Application Object

These instructions are applied to all of the color TV, CW62A.

2. Notes

(1) Because this is not a hot chassis, it is not necessary to use

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

(2) Adjustment must be done in the correct order.But the

adjustment can be changed by consideration of mass production.

(3) The adjustment must be performed in the circumstance of

25±5°C of temperature and 65±10% of relative humidity if there is no specific designation.

(4) The input AC voltage of the receiver must keep rating

voltage in adjusting.

(5) The receiver must be operated for about 15 minutes prior

to the adjustment.

(6) Signal: Received, the standard color signal.(65dB±1dB uV)

LG standard signal means the digital pattern (PAL_EU 05CH).

3. Focus adjustment

(1) Receive the Cross-Hatch Pattern(Fig 1). (2) Set the picture condition on “DYNAMIC(CLEAR)” mode. (3) Adjust the Focus volume of FBT for the best focus of (A) &

(B).

4. Purity & Convergence adjustment

Adjustment should be operated when using the CPT(without ITC from CPT manufacturing place) This adjustment must be done in the order of the following flowchart.

4.1. Color purity adjustment

(1) It makes CPT or CABINET enough to demagnetization. (2) Receive the signal of red raster. (3) Loosen fixed screw of DY and closely to CPT funnel part. (4) Check the center of screen that PURITY MAGNET of CPT

by crossing adjustment. At this time, 4 & 6 pole magnet is located to magnet of nothing.

(5) Move the DY to make equal red on whole screen and it

does not to make the DY by fixed screw after check a simple color of Red/Green/Blue and white raster whether or not it is a pollution of color. (At this time, take care raster of screen and DY must fixing in the condition which maintains a horizontality.)

(6) Check the TV set by move direction.

4.2. Convergence adjustment

These adjustments can the best condition of focus after finished purity adjustment.

(1) Receive the signal of cross hatch that BACK RASTER is

black. (2) Adjust brightness and luminosity till dot appear 9 ~12. (3) Open angle of the two tab of 4 pole MAGNET by isogonic

angle and accord with vertical line of red and blue color in

the middle of screen. (4) Maintain as angle of (3) and rotate the tab to accord with

vertical line of Red and Blue color in the middle of screen.

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ADJUSTMENT INSTRUCTIONS

Assembling DY to

CPT

CPT Assembling

As preparatory operations before assembling CPT, wind cotton Tape for protecting to CPT NECK and DY, CPT connection parts. At this moment, end of tape should be over-lapped and wound in direct route to the NECK.

Let the screen Standard condition. Operate Heat-Run at least 15 minutes.

Torque is to be 9-11 kg f.cm when fixing DY.

Fix the Magnet to the position as shown picture below. Be careful not to make CPT neck shadow while adjusting DY.

HEAT RUN

Degaussing

STC Pre-Adjustment

PURITY Adjustment

DY Fixing

SCREEN Voltage adj.

W/B Fixing

FOCUS not yet ADJ.

STC not yet ADJ.

DYC not yet ADJ.

Convergence Magnet

◀

15 ~ 20mm

6Pole

◀

(5) Open angle of the two tab of 6 pole magnet by isogonic

angle and accord with vertical line of Red/Blue and Green.

(6) Maintain as angle of (5) and rotate the tab to accord with

horizontal line. In case of twisted horizontal line,repeat adjustment of (3) ~ (5) remembering the movement of Red/Green/Blue color.

(7) Move the DY to best condition of convergence and attach

the CPT to a rubber-chock for fixing DY.

5. Screen voltage adjustment

(1) Receive the PAL or SECAM(NTSC) signal into RF mode

(regardless of channel).

(2) If you press the “ADJ”button in LINE SVC mode(IN-START

button),the LINE SVC mode changes to screen adjustment mode.

(3) Turn the Screen Volume of FBT to change luminance of

White signal center as shown below.

(4) Press the ADJ button to exit SVC mode.

6. White balance adjustment

NOTE : When adjusting white balance automatically,connect the

adjustment JIG in SVC mode.(When pressing INSTART,MUTE button on remote control for adjustment orderly,it is changed to CPU OFF mode and screen is

displayed to “CPU OFF”.) (1) Receive 100% white pattern. (2) Adjust LOW Light status(4.5FL) of CR(R CUT), CB(B CUT)

at CG(G CUT:75) : 60.

(3) Adjust HIGH Light status(35FL) of WR(R DRIVE), WB(B

DRIVE) at WG(G DRIVE:380) : 450.

(4) Repeat above step (2) and (3) for the best condition each

status of High Light and Low Light.

7. Deflection setting Data Adjustment

7.1 Adjustment preparation

(1) Tune the TV set to receive an Digital pattern(EU05CH).

(2) Deflection setting data adjustment is operate by SVC communicator.

(3) Enter the deflection mode by selection SERVICE2 key on

SERVICE MENU after enter the adjustment mode by pressing LINE SVC MODE(IN-START KEY).

(4) Use the CH D ,E key to select adjustment item. (5) Use the VOL F ,G key to increase/decrease data.

7.2 Adjustment

<Note>

- When adjusting a deflection,adjust N50Hz of PAL signal first and adjust a deflection data at N60Hz(NTSC), Z60Hz, N50Hz, W50Hz, Z50Hz.

- After finishing deflection adjustment, press the ENTER button to enter or exit SVC mode.

(1) H SHIFT

Adjust so that the geometric horizontal center line is in accord with horizontal center line of CPT.

(2) H PARALLEL

Adjust vertical inclination of screen.

(3) H BOW

After finishing Cushion adjustment, adjust curved rate of top & bottom corner to be equal.

(4) V LINEAR

Adjust the top & bottom size of inner circle to be equal.

(5) V SCROLL

Adjust so that the geometric vertical center line is in accord with vertical center line of CPT.

2. White balance IIC Parameter(Address)

Program

Sub Add

Start Bit

Stop Bit

Offset

Polarity

EP_Rom_S

B(R)_Amp

Win31_wb TWB

B(R)_Cut

Win31_wb TWB

G_Amp

Win31_wb TWB

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Color Temperature

288

295

9000

268

273

13000

N-EU

<Table 1> White Balance Color analyzer

BLO-R(R CUT)

BLO-G(G CUT)

BLO-B(B CUT)

RG(R DRIVE)

GG(G DRIVE)

BG (B DRIVE)

LOW LIGHT

HIGH LIGHT

0 ~ 63

FIX

Range

DATA

<Table 2> White Balance Initial Data

<Table 3> White Balance Initial Data

1. IC

VCD IC

EP_ROM

000 0

Name

Maker Algorithm

Program

Vcd Slave

Win31_wb

TWB

Eeprom_Slave

Win31_wb

TWB

Speed1Delay

G_Cut

Win31_wb TWB

Speed/ Plus 2 2 2 2

(6) EW WIDTH

Adjust until the outmost left and right lattice of received pattern is accord with 25% of other lattice width.

(7) EW PARABOLA

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

(8) EW UPCORNER & (9) EW LOCORNER

After finished cushion adjustment, adjust vertical line of lefttop, right-top, left-bottom, right-bottom of screen to the best straight line.

(10) EW TRAPEZOID

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

of the bottom horizontal line. (11) V SLOPE (12) V AMPLITITUE

Adjust so that the circle of a digital circle pattern should be

located interval of 6~7mm from the effective screen of the

CPT. (13) S CORRECTION

Adjust so that all distance between each lattice width of

top/center/bottom are to be the same. (14) V SHIFT

Adjust so that the geometric vertical center line is in accord

with vertical center line of CPT. (15) V ZOOM (VERTICAL ZOOM) (16) PIP_H(PIP H Position) adjustment - option

Adjust the H-Position by using VOL +/- key until PIP picture

is in contact with main picture.

8. Deflection setting initial data

<Table 4> Deflection setting initial data (SERVICE 2) * Fix : Don’t change data

- After finishing deflection adjustment at PAL 50Hz, NTSC 60Hz is applied deflection compensation value. But recheck condition of adjustment at NTSC system and adjust deflection data if necessary.

- Adjust PIP Position adjustment at only PAL 50Hz.

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<Fig. 2>PAL Digital pattern (EU05CH)

<Fig. 4> PIP H Position

50Hz 60Hz

<Fig. 3> Cross-Hatch Pattern(E-7CH)

CRNU

CRNL

CRNU6

CRNL6

Item

H-SHIFT

H PARALL

H BOW

V LINEAR

V SCROLL

EW WIDTH

EW PARAB

EW UPCOR

EW LOCOR

EW TRAPE

V SLOPE

V AMPLIT

SCORRECT

V SHIFT

V ZOOM

V SYNSLI

OVRVOLIN

VGUARD

Horizontal shift

Horizontal parallelogram

Bow

Vertical linearity

Vertical scroll

EW width

Parabola adj

Upper corner adj

Lower corner adj

Trapezoid adj

Vertical slope

Vertical amplitude

S correction

Vertical shift

Vertical zoom

Vertical slicing level

Over voltage input mode

Vertical guard mode

Adjust

Recommend

Adjust

Recommend

Fix

Description

29”

Adjust

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