lg 29FU1RL, 29FU1RL-L1 Service Manual

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Page 1

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

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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

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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

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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

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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

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(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

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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

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(Table 5) SERVICE 4

WS BKS BSD DSK COR

PF RPO RPA

PWLDAC

IFOFF OSD HPOS CAP HPOS

CHSE

ACL

WHITE STRETCH BLACK STRETCH BLACK STRATCH DEPTH DYNAMIC SKIN CONTROL VIDEO DEPENDENT CORING PEAKING FREQUENCY DELAY RATION POSITIVE/NEGATIVE PEAKS RATION PRE/AFTER SHOOT PEAK WHITE LIMITER DAC IF DEMODULATIOR OSD H-POSITION CAPTION H-POSITION CHROMA SENSITIVITY AUTO COLOR LIMITING

DESCRIPTION

1 1 0 0 2 0 3 2 8

0 1

Middle/South America/Korea

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8. FM TX MODEL(Option)

How to inspect condition of a transmission and reception in FM TRANSMITTER MODEL

(1) FM TRANSMITTER's efficiency inspections is executed to a finished in a final inspection phase. (2) FM TRANSMITTER is a function which receives voice-singal by an exclusive remote control

and earphone, transmitts a FM through transmitter of inner part in MICOM BOADR to TV sound(MONITOR OUTPUT)

(3) If the received frequency which set up in OSD is being tunned without using an exclusive remote control,

it is available to receive in a general FM receiver.

1) Execute in channel generating voice-signal.

2) Select a transmitted frequency in MENU OSD. MENU -> SOUND -> TRANSMITTER -> Select frequency(87.7MHZ)

3) A received frequency in an exclusive remote control or received FM Radio is tuned by 87.7MHz

which is same as frequency in OSD.

4) Check out whether a signal generating to MAIN SPEAKER generates in earphone or receiver or not.

5) There is no alternation and setting of adjusted DATA in the process of inspecting FM TX.

OPTION1

OPTION2

OPTION3

OPTION4

0 : 29” Slim, 1: 29” Flat, 2: 29” Normal, 3: 29” TS/AK 0: Other CPT, 1: TS-AK CPT 0: W/O SCR50, 1: W/SCR50 0: 1 TUNER, 1: 2TUNER 0 : W/O Video Mute, 1: W/ Video Mute 0 : W/O SIDE A/V, 1 : W/ SIDE A/V 0 : Standard, 1 : AV Multi System 0: RF stereo, 1:AV stereo, 2: Mono, 3: Mono Dual 0: No PIP, 1: 1 Tuner PIP, 2: 2 Tuner PIP, 3: Reserved 0: EU=>Low curve, 1: NON-EU=>High curve DVD option FM TX option EYE option 4 Key option TILT option Degaussing option CW62C Only 1 => Vol. Curve/S Mute timing/component compensation Value change Refer to the next page. [Table 14] Refer to the next page. [Table 14] Not available 0 : Standard, 1 : HOTEL Mode 0 : Deep, 1 : Light 0 : W/O Turbo P/S, 1 : W/ Turbo P/S

CPT SCREEN SCR50 TUNER V-MUTE AV3 AV MULTI SOUND PIP VOL CURVE (volume curve) DVD XWAVE EYE 4KEY TILT DEGAUSS(Degaussing) CW62C

OSD LANG LANG INI REMONCON HOTEL COLORTBL TURBO P/S

FUNCTION

(Table 6) OPTION 1, 2, 3, 4

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PURITY & CONVERGENCE ADJUSTMENT

Caution:

Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. However, the effects of adjacent receiver components, or replacement of picture tube or deflection yoke may require the need to readjust purity any convergence.

¯ Purity Adjustment

This procedure DOES NOT apply to bonded yoke and picture tube assemblies. The instrument should be at room temperature (60 degrees F or above) for six (6) hours and be operating at low beam current (dark background) for approximately 20 to 30 minutes before performing purity adjustments.

CAUTION: Do not remove any trim magnets that may be

attached to the bell of the picture tube.

1. Remove the AC power and disconnect the internal degaussing coil.

2. Remove the yoke from the neck of the picture tube.

3. If the yoke has the tape version beam bender, remove it and replace it with a adjustable type beam bender (follow the instructions provided with the new beam bender)

4. Replace the yoke on the picture tube neck, temporarily remove the three (3) rubber wedges from the bell of the picture tube and then slide the yoke completely forward.

5. Reconnect the internal degaussing coil.

6. Position the beam bender locking rings at the 9 o'clock position and the other three pairs of tabs (2,4 and 6 pole magnets) at the 12 o'clock position.

7. Perform the following steps, in the order given, to prepare the receiver for the purity adjustment procedure.

a. Face the receiver in the "magnetic north" direction.

b. Externally degauss the receiver screen with the television

power turned off.

c. Turn the television on for approximately 10 seconds to

perform internal degaussing and then turn the TV off.

d. Unplug the internal degaussing coil. This allows the

thermistor to cool down while you are performing the purity adjustment. DO NOT MOVE THE RECEIVER FROM ITS "MAGNETIC NORTH" POSITION.

e. Turn the receiver on and obtain a red raster by increasing

the red bias control (CW) and decreasing the bias controls for the remaining two colors (CCW).

f. Attach two round magnets on the picture tube screen at 3

o'clock and 9 o'clock positions, approximately one (1) inch from the edge of the mask (use double-sided tape).

DEFLECTION YOKE

PURITY &CONVERGENCE MAGNET ASSEMBLY

RUBBER WEDGES

GLASS CLOTH TAPE

PURITY MAGNET

6-POLE

4-POLE

4-POLE MAGNET

CONVERGENCE MAGNET ASSEMBLY

6-POLE MAGNES

PURITY MAGNET(2-POLE)

X-AXIS YOKE POSITIONING (L/R PURITY)

6-POLE MAGNETS

CONVERGENCE MAGNET ASSEMBLY

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8. Referring to above, perform the following two steps: a. Adjust the yoke Z-axis to obtain equal blue circles. b. Adjust the appropriate beam bender tabs to obtain correct

purity (four equal circles).

9. After correct purity is set, tighten the yoke clamp screw and

remove the two screen magnets.

10. Remove the AC power and rotate the receiver 180 degrees

(facing "magnetic south").

11. Reconnect the internal degaussing coil.

12. Turn the receiver on for 10 seconds (make sure the receiver

came on) to perform internal degaussing, and then turn the receiver off.

13. Unplug the internal degaussing coil.

14. Turn on the receiver and check the purity by holding one (1)

round magnet at the 3 o'clock and a second round magnet at 9 o'clock position. If purity is not satisfactory, repeat steps 8 through 14.

15. Turn off the receiver and reconnect the internal degaussing

coil.

¯ Convergence Adjustment

Caution: This procedure DOES NOT apply to bonded yoke and

picture tube assemblies. Do not use screen magnets during this adjustment procedure. Use of screen magnets will cause an incorrect display.

1. Remove AC power and disconnect the internal degaussing

coil.

2. Apply AC Power and set the brightness to the Picture Reset

condition. Set the Color control to minimum.

3. Make horizontal line.

4. Adjust the Red, Green and Blue Bias controls to get a dim

white line.

5. Restore the screen by removing the horizontal line.

6. Reconnect the internal degaussing coil and apply AC power.

7. Turn the receiver on for 10 seconds to perform internal degaussing and then turn the receiver off again.

8. Unplug the internal degaussing-coil.

9. Turn on the receiver, connect a signal generator to the VHF antenna terminal and apply a crosshatch signal.

Caution: During the convergence adjustment procedure, be

very careful not to disturb the purity adjustment tabs are accidentally move, purity should be confirmed before proceeding with the convergence adjustments.

Note:

Make sure the focus is set correctly on this instrument

before proceeding with the following adjustment.

10. Converge the red and blue vertical lines to the green vertical line at the center of the screen by performing the following steps (below TABLE). a. Carefully rotate both tabs of the 4-pole ring magnet

simultaneously in opposite directions from the 12 o'clock position to converge the red and blue vertical lines.

b. Carefully rotate both tabs of the 6-pole ring magnet

simultaneously in opposite directions form the 12 o'clock position to converge the red and blue (now purple) vertical lines with the green vertical line.

11. Converge the red and blue horizontal with the green line at the center of the screen by performing the following steps. (below TABLE)

a. Carefully rotate both tabs of the 4-pole ring magnet

simultaneously in the same direction (keep the spacing between the two tabs the same) to converge the red and blue horizontal lines.

b. Carefully rotate both tabs of the 6-pole ring magnet

simultaneously in same direction (keep the spacing between the two tabs the same) to converge the red and blue (now purple) horizontal lines with the green horizontal line.

c. Secure the tabs previsouly adjusted by locking them in

place with the locking tabs on the beam bender.

MAGNETS

RED RED

1.ADJUST YOKE Z-AXIS FIRST TO GET EQUAL BLUE COLOR CIRCLES

2 .ADJUST BEAM BENDER 2 POLE MAGNET TO GET FOUR EQUAL COLOR CIRCLES

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RING PAIRS

POLE

ROTATION DIRECTION

OF BOTH TABS

OPPOSITE

SAME

OPPOSITE

SAME

MOVEMENT OF RED

AND BLUE BEAMS

B B

B R B R

B R

POLE

12. While watching the 6 o'clock positions on the screen, rock the front of the yoke in a vertical (up/down) direction to converge the red and blue vertical lines. (Fig upper left)

13. Temporarily place a rubber wedge at the 12 o'clock position to hold the vertical position or the yoke.

14.

Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue horizontal lines are converged. If the lines are not converged, slightly offset the vertical tilt of the yoke (move the rubber wedge if necessary) to equally balance the convergence error of the horizontal lines at 3 o'clock and 9 o'clock and the vertical lines at 6 o'clock and 12 o'clock.

15. Place a 1.5 inch piece of glass tape over the rubber foot at the rear of the 12 o'clock wedge.

16. While watching the 6 o'clock and 12 o'clock areas of the screen, rock the front of the yoke in the horizontal (left to right) motion to converge the red and blue horizontal lines. (Fig. upper right)

17. Temporarily place a rubber wedge at the 5 o'clock and 7 o'clock positions to hold the horizontal position of the yoke.

18. Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue vertical lines are converged. If the lines are not converged, slightly offset the horizontal tilt of the yoke (move the temporary rubber wedges if necessary) to equally balance the convergence error of the horizontal lines at 6 o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9 o'clock.

19. Using a round magnet confirm purity at the center, right and left sides and corners. See Purity Adjustment Procedure.

20. Reconfirm convergence and apply a 1.5 inch piece of glass tape over the rubber foot at the rear of the 5 o'clock and the 7 o'clock wedges.

RED

BLUE

RED BLUE

BLUE

RED

GREEN

BLUE RED

GREEN

ADJUSTMENT

VIEWING

AREA

UP/DOWN ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED AND BLUE RASTERS

ADJUSTMENT

VIEWING

AREA

RED

GREEN

TV SCREEN

LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE SIZE CHANGE OF THE RED AND BLUE RASTERS

UP/DOWN ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED AND BLUE RASTERS

LEFT/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE SIZE CHANGE OF THE RED AND BLUE RASTERS

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SVC REMOCON

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LGE Internal Use Only

Page 14

LGE Internal Use Only

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TROUBLE SHOOTING

Check the waveform

at pin 2, 4 of IC601

Check the voltage

at pin 5, 7 of IC601

Check the waveform

at pin 8, 9, 11, 12

of IC601

Check

IC901, P403A

Check FR901, P403A, P902B

FR401

Page 15

LGE Internal Use Only

- 15 -

Page 16

LGE Internal Use Only

- 16 -

P20A

(R, G, B out of IC501)

check IC501 pin 83,84,85 (R,G,B out)

check IC501 pin 83, 84,85 (R,G,B out)

P20A

(R, G, B out of IC501)

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LGE Internal Use Only

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2 4

8 9 11

5 7

Does the auto-Program operate properly

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LGE Internal Use Only

- 18 -

BLOCK DIAGRAM

Page 19

LGE Internal Use Only

- 19 -

MEMO

Page 20

LGE Internal Use Only

- 20 -

EXPLODED VIEW

300

120

540

311

310

530

330

590

320

504

174

112

150

170

913

400

943

520

Many electrical and mechanical parts in this chassis have special safety-related characteristics.These parts are identified by in the Schematic Diagram and EXPLODED VIEW. 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.

IMPORTANT SAFETY NOTICE

Page 21

P/N:EBY37965601

Page 22

MAIN

LGE Internal Use Only

LED

POWER

CONTRL

lg 29FU1RL, 29FU1RL-L1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual