LG CT-29M65VE User Manual

COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : MC-049A

MODEL:CT-29M65VE

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........................................................................................................6

Adjustment Instructions..................................................................................7

Trouble Shooting .................................................................................................11

Printed circuit board.........................................................................................15

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

Exploded View....................................................................................................20

Exploded View Parts List ..............................................................................21

Replacement Parts List .................................................................................22

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. ARC (Aspect Ratio Control)

changes the picture format.

4. TURBO PICTURE / SOUND BUTTON

selects Turbo picture / sound.

D / E

(Programme Up/Down)

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

F / G

(Volume Up/Down)

adjusts the volume. adjusts menu settings.

6. VCR BUTTONS (option)

control a LG video cassette recorder.

7. SSM (Sound Status Memory)

recalls your preferred sound setting.

8. I/II (option)

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

9. PSM (Picture Status Memory)

recalls your preferred picture setting.

10. TELETEXT BUTTONS (option)

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

11. MUTE

switches the sound on or off.

12. TV/AV

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

13. MENU

selects a menu.

14. OK

accepts your selection or displays the current mode.

VOL

PLAY

P/STILL STOP

REC

REW

I/II SSM LIST

PSM

SLEEP

PIP

Q.VIEW

MIX

TIME

SWAP

INPUT

REVEAL MODE

SIZE

STILL

POSITION

9/4 PIP

ARC

TV/AV

PICTURE

SOUND

2 3

5 6

8 9

POWER

MUTE

TEXT

T U R B O

EYE/

FAVOURITE

(With TELETEXT / Without PIP)

(With TELETEXT / PIP)

15 16

TEXT

MIX

SIZE

FAVOURITE

TIME

HOLD

Q.VIEW

REVEAL MODE

UPDATE

INDEX

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VOL

PLAY

P/STILL STOP

REC

REW

I/II SSM LIST

PSM

SLEEP

Q.VIEW

ARC

TV/AV

PICTURE

SOUND

2 3

5 6

8 9

POWER

MUTE

T U R B O

EYE/

FAVOURITE

15. LIST

displays the programme table.

16. EYE/*(option)

switches the eye function on or off.

17. SLEEP

sets the sleep timer.

18. Q.VIEW

returns to the previously viewed programme.

19. FAVOURITE

selects a favorite programme.

20. 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 programme scan mode through 4 or 9 sub pictures.

COLOURED BUTTONS

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

FAVOURITE

Q.VIEW

SWAP

INPUT

SIZE

STILL

POSITION

9/4 PIP

EYE/

PIP

(Without TELETEXT / With PIP)

(Without TELETEXT / PIP)

15 16

17 19

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SPECIFICATIONS

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

F Scope

This specification can be applied to all the television related to MC-049A Chassis.

F Test and Inspection Method

1) performance:Follow the Standard of LG TV test

2) Standards of Etc. requirement

- Safety: IEC60065

- EMC: EN55020,EN55013

F Test Condition

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

2) Relative Humidity:65

± 10%

3) Use the parts only designated in B.O.M.,PARTS SPEC.,or drawings.

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.

Standard input Voltage

110-240Vac, 50/60Hz

230Vac, 50/60Hz

Market

Middle East, Africa

Chassis

MC049A

Brand

4 5

6 7

Item

Receiving System

Available Channel

Input Voltage

Market Screen Size

Tuning System Operating Environment

Storage Environment

Remark

For EU/ For Non EU

OPTION

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 AC 110-240V, 50/60Hz AC 230V 50/60Hz EU,CIS, China, Asia, Africa Flat 25”, 29”, 28”, 32” NOR 25”, 27”, 28”, 29” FVS 100Program

1) Temp : 0 ~ 45 deg

2) Humidity: 85% under

1) Temp : -20 ~ 60 deg

2) Humidity: 85% under

F General Specification

1. Application Object

These instructions are applied to all of the color TV, MC-049A.

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.

3. Focus adjustment

3.1. Preliminary steps

Tune the TV set to receive a digital pattern. (SVC mode:Automatically mode change the STANDARD MODE)

3.2. Adjustment Method

1) Single Focus CPT

Adjust the upper Focus volume of FBT for the best focus of horizontal line A,vertical line B.

2) Double Focus CPT

a) Adjust the lower Focus volume of FBT for the best focus

of vertical line B.

b) Adjust the upper Focus volume of FBT for the best focus

of area A.

c) Repeat above step 1) and 2) for the best overall focus.

4. Purity & Convergence adjustment

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 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 fixed 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 EXIT TV/AV 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 changes to SVC mode and screen displays

“CUT OFF”.) (1) Receive 100% white pattern. (2) Adjust LOW LIght status(4.5FL) of CUT R,CUT B at

CG:70.

(3) Adjust HIGH LIght status(35FL) of WDR R,WDR B at

WDR G:380.

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

status of High Light and Low Light.

<CAUTION> W/B Program “Twbeng_v2.0”

- W/B adjustment after Cutoff : Instart -> adj. -> mute(cutoff)-> tv/av(wb) Release key is EXIT key

- W/B adjustment : Instart -> mute(cpuoff) -> Release key is TV/AV key

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 SERVICE1 key on

SERVICE MENU after enter the adjustment mode by

pressing LINE SVC MODE(IN-START KEY). (4) Enter the deflection mode by pressing ADJUST key. (5) Use the CH D ,E key to select adjustment item. (6) Use the VOL F ,G key to increase/decrease data.

<Note>

(1) When adjusting a deflection,adjust N50Hz of PAL signal first and

adjust a deflection at Normal 60Hz(NTSC). (2) Adjust a deflection as shown below.

PAL 4:3 -> NTSC 4:3 (3) After finishing deflection adjustment,press the EXIT key to

exit in adjustment mode. (4) Wide Models

After adjusting 16:9(50Hz), Readjust 14:9(50Hz) ->

ZOOM(50Hz) -> 4:3(50Hz) -> 16:9(60Hz) -> 14:9(60Hz) ->

ZOOM(60Hz) -> 4:3(60Hz).

7.2 Adjustment

(1) VL(Vertical Linearity) adjustment:

Adjust the top & bottom size of inner circle to be equal. (2) VA (Vertical Amplitude) adjustment:

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

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

CPT. (3) SC (Vertical S correction) adjustment:

Adjust so that all distance between each lattice width of

top/center/bottom are to be the same.

2. White balance IIC Parameter

Program Sub Add Start Bit

Stop Bit

Offset

Polarity

EP_Rom_S

R_Amp

TWBeng2.0

1C8

4 0 1

7A7B

R_Cut

TWBeng2.0

1C3

4 0 1

7475

B_Amp

TWBeng2.0

1CA

4 0 1

7E7F

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X Y

Color Temperature

288 295

9000

268 273

13000

N-EU

<Table 1> White Balance Color analyzer

CR CG

CB WR WG WB

LOW LIGHT

HIGH LIGHT

0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511 0 ~ 511

70 70

70 430 380 430

Range

DATA

<Table 2> White Balance Initial Data

<Table 3> White Balance Initial Data

1. IC

VCD IC

EP_ROM

VCT48xyi

24C16

Micronas

ST, ATMEL

0 F 0 0

Name

Maker Algorithm

Program

Vcd Slave

TWBeng2.0

24C16

Program

Eprom_Slave

TWBeng2.0AESpeed1Delay

B_Cut

TWBeng2.0

1C5

4 0 1

7879

Speed/ Plus 1 1 1 1

(4) VS (Vertical Shift) adjustment:

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

(5) HS(Horizontal Shift) adjustment:

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

(6) EW(East-West Width) adjustment:

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

(7) ET(Trapezoidal) adjustment:

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

(8) EP(Pin Cushion) adjustment:

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

(9) ANGLE adjustment

When you adjust the angle, adjust correctly raster of left/right screen.

(10) BOW adjustment

A standard is not changing the default value.

(11) CRNU(Upper Corner Correction) adjustment:

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

(12) CRNL(Lower Corner Correction) adjustment:

After finished EP adjustment,adjust vertical line of leftbottom ,right-bottom of screen to the best straight line.

(13) PIP(PIP Position)

Adjust until the distance between PIP and main picture becomes about 1~2mm by using VOL +/- key.

OPTION Adjustment

8-1. Preparation for Adjustment

1) This option adjustment decides function in accordance with model. Press the SVC TX adjustment button(IN-START button) at SVC mode, then adjust the option at OPTION1 mode.

2) Mark the option adjustment data like [111,111,111,111] in BOM.

8-2. Adjustment Method

OPTION data input

1) Function : 1, No function : 0

2) Select each OPTION function by the CH Up/Down

button and then set up each OPTION by the VOL Up/Down button at OPTION 1,2,3,4.

8-3. OPTION Function

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<Fig. 2>PAL Digital pattern (EU05CH)

<Fig. 3> PIP H Position

VS VA VL SC HS

ET EP

ANGLE

BOW

UPCOR

LOCOR

PIP_H

-512~511

-512~511 32~2047

-256~255

-512~511

0~40

-70 140 110

-70

-12

-80

0 0

8 20 15

10 70

-70 140 130

-69

-15

-78

0 0

8 20 15

Variable range

N50Hz(PAL)

29”

N60Hz(NTSC)

29”

AV3

S-VIDEO

DVD

SCART

WIDE

GAME

21inch

A2ST

Option Code

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

Function

Without A/V3 With AV3 With out S-VIDEO With S-VIDEO Without COMPONENT(480i) With COMPONENT(480i) PHONE JACK SCART JACK Not WIDE MODEL WIDE MODEL Without GAME function With GAME function Not 21inch MODEL 21inch MODEL NICAM NICAM & FM STEREO

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