LG 29FX6AM Schematic

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CONTENTS

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

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

CONTROL DESCRIPTIONS .................................................................... 4

SPECIFICATIONS .................................................................................... 7

ADJUSTMENT INSTRUCTIONS ............................................................. 8

TROUBLE SHOOTING .......................................................................... 17

PRINTED CIRCUIT BOARD ....................................................................20

BLOCK DIAGRAM ................................................................................. 24

EXPLODED VIEW .................................................................................. 28

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

LGE Internal Use Only

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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.

IMPORTANT SAFETY NOTICE

0.15uF

LGE Internal Use Only

AC Volt-meter

To Instrument’s exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

1.5 Kohm/10W

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 BUTTON / SOUND BUTTON (option)

selects Turbo picture/sound.

5.

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.

OK

accepts your selection or displays the current mode.

6.

VCR BUTTONS (option)

control a LG video cassette recorder.

7.

I/II

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

8. PSM (Picture Status Memory)

recalls your preferred picture setting.

9.

SLEEP

sets the sleep timer.

10.

MAIN STILL/

*

(or STILL)

freezes motion of the picture.

11. TELETEXT BUTTONS (option)

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

12. MUTE

switches the sound on or off.

13. TV/AV

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

( With TELETEXT)

( With PIP)

OK

PR

VOL

PR

VOL

PLAY

FAVOURITE

STOP

REC

REW

FF

I/II SSM LIST

PSM

SLEEP

MAIN STILL/

Q.VIEW

?

MIX

TIME

SWAP

INPUT

REVEAL MODE

SIZE

STILL

UPDATE

i

M

0

ARC

TV/AV

MENU

PICTURE

SOUND

1

2 3

4

5 6

7

8 9

POWER

MUTE

TEXT

PR

T U R B O

EYE/

INDEX/

PIP

1

2

4

3

5

6

21

7 9

12

13 14

15

18

17

16

19

20

10

8

10 11

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CONTROL DESCRIPTIONS

LGE Internal Use Only

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14.

MENU

selects a menu.

15. LIST

displays the programme table.

16. SSM (Sound Status Memory)

recalls your preferred sound setting.

17.

EYE/*(option)

switches the eye function on or off.

18. Q.VIEW

returns to the previously viewed programme.

19. INDEX

/

*

(option)

switches FRONT DISPLAY on or off.

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.

21. FAVOURITE

selects a favourite programme.

*

: No function

COLOURED BUTTONS : These buttons are used for teletext (only

TELETEXT models) or programme edit.

I/II SSM LIST

PSM

SLEEP

Q.VIEW

SWAP

INPUT

SIZE

STILL

UPDATE

PR

EYE/

INDEX/

PIP

MAIN STILL/

1

2

4

3

5

6

21

7 9

12

13 14

15

18

17

16

19

20

8

11

10

(With TELETEXT / Without PIP)

(Without TELETEXT / With PIP)

LGE Internal Use Only

POWER

1 4 7

ARC

SOUND

T U R B O

VOL

REW

FAVOURITE

2 3 5 6 8 9 0

PICTURE

PR

PLAY

STOP

MUTE

TV/AV

MENU

OK

VOL

FF

REC

I/II SSM LIST

PSM

SLEEP

INDEX/

MAIN STILL/

TEXT

MIX

TIME

REVEAL MODE

SIZE

STILL

UPDATE

EYE/

Q.VIEW

?

M

i

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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

6. AUDIO/VIDEO IN SOCKETS (AV IN3)

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

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

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 AV IN3.

7. EYE (option)

adjusts picture according to the surrounding conditions.

8. HEADPHONE SOCKET (option)

Connect the headphone plug to this socket.

Front panel

Side panel

S-VIDEO

VIDEO

L/MONO RAUDIO

AV IN3

6

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LGE Internal Use Only

SPECIFICATIONS

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

Item

Receiving system

AV receiving system

Component receiving system

Available Channel

Input Voltage

Market Screen Size Tuning System Operating Environment

Storage Environment

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A Scope

This specification can be applied to all the television related to MC-05HB Chassis.

A Test and Inspection Method

1) performance : Follow the Standard of LG TV test

2) Standards of Etc. requirement

- Safety: IEC60065

- EMC: EN55020,EN55013

A Test Condition

1) Temperature : 25 ± 5°C(CST : 40 ± 5°C)

2) Relative Humidity : 65 ± 10%

3) Power voltage : 110-220V~, 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.

A General Specifications

No.

1

2

3

4

5

6 7 8 9

10

Specification

PAL,SECAM BG PAL/SECAM DK PAL I SECAM-L/L’ NTSC M NTSC M/PB PAL BG, DK, I SECAM BG, DK 480i/ 480P 576i/ 576P 1080i 50Hz/60Hz 720P 50Hz/60Hz

1) VHF : E2 ~ E12 UHF : E21 ~ E69 CATV : S1 ~ S20 HYPER : S21 ~ S41

2) L/L’

3) NTSC-M

VHF : 2 ~ 13CH UHF : 14 ~ 69CH CATV : 01 ~ 125CH

110-240V~, 50/60Hz(Wide Range) 220V~ or 230V~, 50/60Hz(Narrow) EU, Non EU 4:3 Flat 29”, Wide Flat 32” FVS 100/200 Program

1) Temp : 0 ~ 40 deg

2) Humidity: below 85%

1) Temp : -20 ~ 60 deg

2) Humidity: below 85%

Remark

EU

Non EU

EU

Non EU

200 PR. (W/O TXT)

EU : Narrow

Non EU : Narrow, Wide

Option

LGE Internal Use Only

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1. Application Object

These instructions are applied to all of the color TV, MC-05HB chassis.

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. Soft ware download

1) Connect JIG to P004 of Digital Board.

2) Connect SCL line of JIG Switch to Ground.

3) Turn on JIG and supply 6V to Digital Board. Terminate the SCL of clause 2) by using Switch.

4) After termination of SCL line, wait for 3 second.

5) Execute ‘vct69xyp_main_graphic.vi2c’ program.

6) Click the TVT button.

7) Double click right check box of ‘Boot loader Version‘ line, and then check to change to 40 from 0.

8) After checking ‘40’, Click the ‘Erase Flash’ button.

9) Double click ‘Edit Window’.

10) Click the file select button of Name to select file.

11) Select necessary file.

ADJUSTMENT INSTRUCTIONS

A

B

LGE Internal Use Only

12) Download the file with ‘OK’ button.

13) Check download process(about 30~40 sec.).

4. DVCO Adjustment

1) This adjustment applies to the frame assembly unit adjustment.

2) This adjustment is to adjust the crystal oscillator frequency of VCTP IC and is done after receiving the EU05CH(digital pattern) signal.

3) If you press the ADJ button to enter the SCREEN mode, DVCO adjustment is automatically done. (T/X may not operate properly during DVC0 adjustment.)

5. Temporary screen voltage adjustment

1) This adjustment applies to the frame assembly unit adjustment.

2) Enter Screen Mode with ADJ button. Turn the screen volume to disappear horizontal line.

6. Focus Adjustment

6-1. Preliminary steps

Receive the PAL-B/G 07ch(Cross hatch pattern, <Fig 1>) and Set the picture mode to “STANDARD”.

6-2. Adjustment

1) Adjust the lower Focus volume of FBT for the best focus of vertical line A.

2) Adjust the upper Focus volume of FBT for the best focus of area A.

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

7. Purity & Convergence adjustment

This 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.

7-1. 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.

7-2. 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.

- 9 -

A

<Fig. 1>

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.

LGE Internal Use Only

Convergence Magnet

15 ~ 20mm

6Pole

4

2