lg 29FU1RL, 29FU1RL-L1 Service Manual

COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : CW62C

MODEL : 29FU1RL

MODEL : 29FU1RL-T1

Apr., 2009

Printed in ChinaP/NO : MFL37773222

North/ Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com

Asia/Oceania http://biz.lgservice.com

Internal Use Only

LGE Internal Use Only

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CONTENTS

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

ADJUSTMENT INSTRUCTIONS ..............................................................................................................................................................4

PURITY & CONVERGENCE ADJUSTMENT ..........................................................................................................................................10

SVC REMOCON......................................................................................................................................................................................13

TROUBLESHOOTING.............................................................................................................................................................................14

BLOCK DIAGRAM ...................................................................................................................................................................................18

EXPLODED VIEW....................................................................................................................................................................................20

SCHEMATIC DIAGRAM .............................................................................................................................................................................

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

COMPONENT LOCATION GUIDE..............................................................................................................................................................

SPECIFICATIONS

POWER INPUT ...................................................................................................................................................... AC100-240V~50/60Hz

POWER CONSUMPTION ................................................................................................................................................................135W

ANTENNA INPUT IMPEDANCE ...................................................................................................................VHF/UHF 75 ohm Balanced

CHANNEL RANGE

VHF ................................................................................................................................................................................................. 2-13

UHF ................................................................................................................................................................................................ 14-69

CATV(125) ..................................................................................................................................................................01, 02~13, 14~125

INTERMEDIATE FREQUENCIES

Picture I-F carrier frequency ......................................................................................................................................................45.75MHz

Sound I-F carrier frequency ....................................................................................................................................................41.25 MHz

Color Sub-carrier frequency .................................................................................................................................................... 42.17 MHz

Center frequency ..........................................................................................................................................................................44 MHz

CHASSIS CONSTRUCTION.................................................................................................................................... IC-Solid state chassis

PICTURE TUBE ................................................................................................................................................ Type No. : A68ERS870X

SOUND OUTPUT ............................................................................................................................................................................... 10W

CABINET ......................................................................................................................................................................................... Plastic

ABBREVIATIONS: Used in this book

ADJ ...............................................................Adjustment or Adjust

AFC .................................................Automatic Frequency Control

AGC.......................................................... Automatic Gain Control

AMP .................................................................................Amplifier

CRT .................................................................Cathode Ray Tube

DEF ............................................................................... Deflection

DET.................................................................................. Detector

FBT............................................................... Flyback Transformer

H.V............................................................................ High Voltage

OSC................................................................................ Oscillator

SEP................................................................................ Separator

SYNC................................................................... Synchronization

S.I.F.............................................. Sound Intermediate Frequency

V.I.F ...............................................Video Intermediate Frequency

H ....................................................................................Horizontal

V ........................................................................................Vertical

IC ......................................................................Intergrated Circuit

OSD .................................................................On-Screen Display

SAP ......................................................... Second Audio Program

BPF .....................................................................Band Pass Filter

ST ...................................................................................... Stereo

LPF .......................................................................Low Pass Filter

DP .................................................................... Differential Phase

DG .....................................................................Differential Group

PLL ................................................................ Phase Locked Loop

APC ......................................................Automatic Picture Control

BM ....................................................................................B+ Main

BT .................................................................................B+ Tuning

LGE Internal Use Only

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SAFETY PRECAUTIONS

1. Before returning an instrument to the customer, always make a safety check of the entire instrument, including, but not limited to, the following items:

a. Be sure that no built-in protective devices are defective and/or have

been defeated during servicing. (1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reinstalling the chassis and/or other assemblies in the cabinet, be sure to put back in place all protective devices, including, but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks.

Do not operate this instrument or permit it to be operated without all protective devices correctly installed and functioning.

b. Be sure that there are no cabinet openings through which an adult or

child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, (1) spacing between the picture tube and the cabinet back, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.

c. Antenna Cold Check-With the instrument AC plug removed from any

AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC plug prongs tied together and touch the other ohmmeter lead in turn to each tuner antenna input exposed terminal screw and, if applicable, to the coaxial connector. If the measured resistance is less than 1.0 megohm or greater than 5.2 megohm, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this test with the instrument AC switch in the off position.

d. Leakage Current Hot Check-With the instrument completely

reassembled, plug the AC line cord directly into a 120 V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI)

C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument AC switch first in the on position and then in the off position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the instrument power cord plug in the outlet and repeat the test.

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER.

e. X-Radiation and High Voltage Limits-Because the picture tube is the

primary potential source of X-radiation in solid-state TV receivers, it is specially constructed to prohibit X-radiation emissions. For continued Xradiation protection, the replacement picture tube must be the same type as the original. Also, because the picture tube shields and mounting hardware perform an X-radiation protection function, they must be correctly in place. High voltage must be measured each time servicing is done that involves B+, horizontal deflection, or high voltage. Correct operation of the X-radiation protection circuits also must be reconfirmed each time

they are serviced. (X-radiation protection circuits also may be called "horizontal disable" or "hold-down.") Read and apply the high voltage limits and, if the chassis is so equipped, the X-radiation protection circuit specifications given on instrument labels and in the Product Safety & Xradia

tion Warning note on the service data chassis schematic. High voltage is maintained within specified limits by close-tolerance safety-related components/adjustments in the high-voltage circuit. If high voltage exceeds specified limits, check each component specified on the chassis schematic and take corrective action.

2. Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the receiver chassis, or on the picture tube.

3. Design Alteration Warning- Do not alter or add to the mechanical or electrical design of this TV receiver. Design alterations and additions, including, but not limited to, circuit modifications and the addition of items such as auxiliary audio and/or video output connections, might alter the safety characteristics of this receiver and create a hazard to the user. Any design alterations or additions will void the manufacturer's warranty and will make you, the servicer responsible for personal injury or property damage resulting therefrom.

4. Picture Tube Implosion Protection Warning-The picture tube in this receiver employs integral implosion protection. For continued implosion protection, replace the picture tube only with one of the same type and number. Do not remove, install, or otherwise handle the picture tube in any manner without first putting on shatterproof goggles equipped with side shields. People not so equipped must be kept safely away while picture tubes are handled. Keep the picture tube away from your body. Do not handle the picture tube by its neck. Some "in-line" picture tubes are equipped with a permanently attached deflection yoke; because of potential hazard, do not try to remove such "permanently attached" yokes from the picture tube.

5. Hot Chassis Warning-a. Some TV receiver chassis are electrically connected directly to one conductor of the AC power cord and may be safely serviced without an isolation transformer only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC power source. To confirm that the AC power plug is inserted correctly, with an AC voltmeter measure between the chassis and a known earth ground. If a voltage reading in excess of 1.0 V is obtained, remove and reinsert the AC power plug in the opposite polarity and again measure the voltage potential between the chassis and a known earth ground. b. Some TV receiver chassis normally have 85 V AC (RMS) between chassis and earth ground regardless of the AC plug polarity. These chassis can be safely serviced only with an isolation transformer inserted in the power line between the receiver and the AC power source, for both personnel and test equipment protection. c. Some TV receiver chassis have a secondary ground system in addition to the main chassis ground. This secondary ground system is isolated from the AC power line. The two ground systems are electrically separated by insulating material that must not be defeated or altered.

6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas: a. near sharp edges, b. near thermally hot parts- be sure that leads and components do not touch, c. the AC supply, d. high voltage, and e.antenna wiring. Always inspect in all areas for pinched, out-of-place, or frayed wiring. Do not change spacing between components, and between components and the printed circuit board. Check the AC power cord for damage.

7. Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be replaced with components, parts, or wiring that meet original specifications. Additionally, determine the cause of overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard.

8. PRODUCT SAFETY NOTICE Some electrical and mechanical parts have special safety related characteristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by shading, by a

, or by

on schematics and parts lists. Use of a substitute replacement that does

not have the same safety characteristics as the recommended replacement parts might create shock, fire, and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate.

DEVICE UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH GROUND

LEAKAGE CURRENT TESTER

(READING SHOULD

NOT BE ABOVE

0.5mA)

AC Leakage Test

LGE Internal Use Only

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1. Application Object

These instructions are applied to CW-62A/C 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. (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 : The standard color signal is approved in

65±1dBµV.

The standard color signal means digital pattern signal.

3. Focus Adjustment

3-1. Preparation for Adjustment

Receive the Cross-Hatch Pattern(Refer to Fig. 1) and set

Picture mode to “DYNAMIC(CLEAR)”.

3-2. Adjustment

Adjust the upper Focus volume of FBT for the best focus of screen quarter portion vertical line(red

circle).

4. Screen Voltage & Sub-Bright & White Balance Adjustment

4-1. Adjustment of Screen Manually

(Using ADJ.Remote Control)

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

channel.

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

KEY), the mode changes to Horizontal Line mode for screen adjustment.

(3) Adjust the SCREEN at disappear point Horizontal Line using

SCREEN VOL. of FBT (Press the Exit button to exit SVC mode)

4-2. Adjustment of White Balance Manually

NOTE : When adjusting white balance automatically, connect the

adjustment JIG in LINE SVC MODE. (When pressing INSTART, MUTE key on remote control for adjustment orderly, it changes to AUTO MODE and Left/Top of screen displays “AUTO”.)

(1) Receive 100% white pattern. (2) Adjust LOW Light status(4.5FL) of BLO-R(R CUT), BLO-

G(G CUT) .

(3) Adjust HIGH Light status(35FL) of RG(R-DRIVE), GG(G

DRIVE) at BG(B-DRIVE): 32.

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

status of High Light and Low Light.

X: 267, Y: 276 (Color Temperature: 13000

4-3. Adjustment of Sub-Bright

(1) If you press the “ADJ” button on the Remote Control for

adjustment in SCREEN adjustment Mode

, mode changes to Sub-Bright adjustment mode. (Pressing the Instart-ADJ-ADJ and enter Sub-Bright adjustment mode) (Sub-Bright adjustment mode: 14CH, CONTRAST/BRIGHT Initial data)

(2)

Adjust until number “3” almost disappears by using VOL +,

- key.

(3) After finishing adjustment, press the ADJ Key to exit.

ADJUSTMENT INSTRUCTIONS

(Table 1) White Balance Initial Data

LOW

LIGHT

HIGH

LIGHT

BLO-R(R CUT) BLO-G(G CUT)

RG(R DRIVE) GG(G DRIVE) BG(B DRIVE)

32 32

32 32 32 Fix.

0 ~ 63 0 ~ 63

0 ~ 63 0 ~ 63 0 ~ 63

Menu Range Initial Data

US 9CH

(Fig. 1) Cross-Hatch Pattern

A B

Gray Scale

Color Bar

2 3 4 5 6 7 8 9

(Fig. 2) MONO SCOPE

LGE Internal Use Only

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5. Deflection Data Adjustment

5-1. Adjustment Preparation

(1) Receive the Digital Pattern. (2) Using Remote Control for adjustment. (3) Select the SERVICE 2 in the SERVICE MENU by pressing

LINE SVC MODE(IN-START KEY) and enter deflection

adjustment mode by pressing VOL + Key. (4) Using the CH +, CH - Key for select the adjustment item. (5) Using the VOL +, VOL - Key for increase/decrease data.

5-2. Adjustment

(1) First, adjust deflection data at N50Hz(PAL) and adjust at

N60Hz(NTSC), Z60Hz, N50Hz, W50Hz, Z50Hz. (with ARC

Model) (2) Only adjust N60Hz(NTSC). (3) After finishing deflection adjustment, press the “ENTER “

key to enter(before pressing the IN-START Key) or exit in

Service mode. (EXIT KEY)

(4) V SLOPE

When you select the V SLOPE adjustment Mode, a half of

the lower screen is Blanking.

At this time, adjust the Blanking Line and geometrical

vertical center-line to be identical.

(5) V SHIFT(VS)

Adjust so that the horizontal center line of a digital circle

pattern is in accord with geometric horizontal center of the

CPT.

(6) V LINEAR(VL)

Adjust until upper and lower screen are symmetrically

equal in Digital Pattern.

(7) V AMPLIT(V AMPITUDE)

NTSC signal: Adjust so that the circle of a digital circle

pattern may be located within the effective screen of the CPT.

(8) H SHIFT(HS)

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

(9) EW WIDTH(EW)

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

(10) EW PARAB(EW PARABOLA)

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

(11) EW TRAPE(EW TRAPEZOID)

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

(12) EW UPCOR & EW LOCOR

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

(13) H BOW

After finished EP adjustment, adjust until symmetrize upper and lower corner of the screen.

(14) H PARALL(ANGLE)

Adjust the vertical slope.

(15) SCORRECT(S CORRECTION)

Adjust so that all distance between each lattice width of top/center/bottom are to be the same.

[ Setting the CPT Default(Initial data) value like that, because

it is decide by CPT DY value

(16) V SCROLL

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

(17) V ZOOM

Setting the CPT Default(Initial data) value like that, because it is decide by CPT DY value

Adjustment Point

Actual Screen Size

US 9CH

UPCOR

EW PARAB

LOCOR

LGE Internal Use Only

- 6 -

(Table 2) Deflection Setting Initial Data(SERVICE 2)

V SLOPE

V SHIFT V LINEAR V AMPLIT

H-SHIFT

EW WIDTH EW PARAB

EW TRAPE EW UPCOR EW LOCOR

H BOW

H PARALL

SCORRECT

V SCROLL

V ZOOM

WBR WBF

V SYNSLI

OVRVOLIN

V GUARD

25 43 44 19 39 27 24 21 45 50 34 37 35 25 25

2 2 0 0 0

28 10 41 15 45 30 44 15 50 57 29 34 32 33 25 10

2 0 0 1

21 43 40 22 34 33 55 13 45 55 35 32 35 21 25

7 2 0 0 1

Vertical slope Vertical shift Vertical linearity Vertical amplitude Horizontal shift EW width Parabola adj Trapezoid adj Upper corner adj Lower corner adj Bow Horizontal parallelogram S correction Vertical scroll Vertical zoom Timing of Wide Blanking Timing of Wide Blanking Vertical slicing level Over voltage input mode Vertical guard mode

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes

Yes adjust if necessary adjust if necessary adjust if necessary adjust if necessary adjust if necessary adjust if necessary adjust if necessary adjust if necessary

DESCRIPTION

29"

TS Slim

29"

FLAT

29"

13R

REMARK

LGE Internal Use Only

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7. SVC Default Data

(Table 3) SERVICE 1

OVMADAPT

OVMTHR ADC LEV DEC LEV

MONO LEV

SAP LEV

FILTBW

MTS LEV

AUX3 VOL

FMWINDOW

BOOSTVAL

MAX VOL

DCXO VAL

DCXOA

BAMA FC

SNDSTEP

SNDRANGE

MONO TH

STEREO TH

GAME ADC

1 16 18 18 12

0 16 84

100

255 249 250

1 16 18 18 12

0 61

100

FM pre-scaler(Stereo L/R) FM pre-scaler(Mono)

Monitor OUT Level

Digital Ctl Xtal Osc.

OVER MODULATION ADAPT OVER MODULATION THRESHOLD ADC LEVEL(-16~15) - ADCLEV DEC LEVEL(-16~15) - DECLEV MONO LEVEL(-16~15) - MONOLEV SAP LEVEL(-16~15) - SAPLEV FILTER BANDWIDTH MTS LEVEL(-16~15) - MTSLEV AUX3 VOL(SCART1 RF SOUND OUT) FM WINDOW FILTER(FMWS) BOOSTER MAX VOLUME DCXO VALUE DCXO ALIGNMENT

GAME ADC LEVEL(0~30)

DESCRIPTION

REMARK

Middle/South America

Korea

(Table 4) SERVICE 3

AGC

RG GG

BG BLO-R BLO-G

CDL

L-DLY

RGB-BRI

29 32 32 32 32 32

7 13 25

29 32 32 32 32 32 11 13 25

AGC take over Red Gain Green Gain Blue Gain Black level offset Red Black level offset Green Cathode Drive Level Luminance delay time OSD/TEXT BRIGHTNESS

DESCRIPTION

29” S-SLIM

Sus

Invar AK

29 32 32 32 32 32

7 13 22

29 32 32 32 32 32

8 13 22

29” FLAT

29” Normal

1.3R

+ 15 hidden pages