LG 21 SA1 RL CH CW81 B

Internal Use Only North/ Latin America Europe/Africa Asia/Oceania

http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com

COLOR TV SERVICE MANUAL CHASSIS : CW81B

MODEL : 21SA1RL/RG/RLX MODEL : 21SA1RL/RG/RLX-L4 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL42466416

Aug., 2009 Printed in China

CONTENTS SAFETY PRECAUTIONS ...........................................................................................................................................................................3 ADJUSTMENT INSTRUCTIONS ................................................................................................................................................................4 TROUBLE SHOOTING..............................................................................................................................................................................12 EXPLODED VIEW .....................................................................................................................................................................................16 SCHEMATIC DIAGRAM ...............................................................................................................................................................................

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

BLOCK DIAGRAM.........................................................................................................................................................................................

SPECIFICATIONS POWER INPUT ....................................................................................................................................................... AC100-240V~50/60Hz POWER CONSUMPTION ....................................................................................................................................................................85W 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. : A51QGV991X001(D) SOUND OUTPUT .................................................................................................................................................................... 7W or 10W CABINET ........................................................................................................................................................................................... Plastic

ABBREVIATIONS: Used in this book ADJ ...............................................................Adjustment or Adjust

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

S.I.F.............................................. Sound Intermediate Frequency V.I.F ...............................................Video Intermediate Frequency

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

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-2-

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

LGE Internal Use Only

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.

AC Leakage Test

(READING SHOULD NOT BE ABOVE 0.5mA)

+ TEST ALL EXPOSED METAL SURFACES

EARTH GROUND

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

CopyrightŠ2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

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.

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.

2-WIRE CORD ALSO TEST WITH PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

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.

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.

LEAKAGE CURRENT TESTER

DEVICE UNDER TEST

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 & Xradiation 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.

-3-

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 ÂĄ , 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.

LGE Internal Use Only

ADJUSTMENT INSTRUCTIONS 1. Scope of Application

4. Screen Voltage Adjustment

These instructions are applied to CW81B Chassis.

4-1. Adjustment (Using Factory Remote Control) 1) Input in the 75Ω cable LG standard signal (Digital Pattern, 480NC).

2) Press the “ADJ’ key of factory remote control once to make the TV set display horizontal line.

3) Turn the screen volume on the FBT clockwise until the horizontal line is visible and turn it counterclockwise until horizontal line faintly visible.

(Exit screen voltage adjustment by press “Enter(A)” key of factory remote control.)

2. Notes 1) Because this is a cold chassis, it is not necessary to use an isolation transformer. However, operating it using a transformer between the power supply line and chassis input to prevent electric shock and to protect the test instrument.

2) All adjustment must be done in the correct sequence.

However, for better productivity, it can be change in a prepermitted range.

3) Environment conditions : If not specified, it must be done in following conditions.

Temperature : 25 ± 5°C Humidity: 60% ± 10% 4) Power supply of SET for NTSC Korea market: 220V±10%, 60Hz Taiwan market: 110V±10%, 60Hz Japan market: 100V±10%, 50/60Hz 5) If not specified, the receiver must be operated for more than 20 minutes prior to the adjustment.

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

NTSC: LG standard signal means the digital pattern 13CH (480NC) 7) If not specified, APC ON is APC CLEAR (DYNAMIC)

5. Purity and Convergence Adjustment 5-1. Purity adjustment (1) Adjustment Preparation 1) Receive Red Raster Pattern for purity adjustment (51CH).

2) Demagnetize the CPT and Cabinet with a degaussing coil.

(2) Adjustment 1) Pre-adjust the static convergence (STC) with the 4 and 6pole magnet.

2) If the horizontal Line is inline with CPT Mark, 2-Pole magnet should direct 3-9 o’clock direction.

3) If not, direct 2-pole magnet handle toward 6-12 o’clock direction and adjust the Horizontal Line to fall onto the mark opening the magnet at an angle.

4) Push the DY(deflection yoke) all the way to the CPT funnel.

5) Turn the purity magnet(2-pole magnet) so that the “green” color portion of left side and the “blue” color portion on the right side have equal amount of color.

3. AGC Voltage Adjustment 3-1. Necessary Instrument - Digital Multi-meter: 1 set - Max Input Current : Over 1A/ Max Input Voltage : 500Vdc - Measurement Range : 10mV-100mVdc/ Accuracy : 0.03%

3-2. Adjustment Preparation G

1) Input in the 75Ω cable 65dB(±1dB) LG standard signal.

2) Connect the multi-meter to J105 (AGC Check, Marking).

B

G

R

B

6) Pull the DY slowly backward and fix it when the whole screen becomes red.

(The specified torque for fixing DY screw should be 10Kg/cm.)

3-3. Adjustment 1) Press the “INSTART” key of factory remote control and select “VP0 (RF AGC)” adjustment mode.

2) Press the VOL+/- (F/ G) key until the multi-meter shows reading as shown below.

3) CAUTION: Since the signal strength can be easily changed by the condition of signal cable, you need to check the signal strength frequently in order to prevent error.

R

G

R

R

B

5-2. Convergency Adjustment (1) Necessary Instrument

Tuner P/N

Maker

AGC Vol

Signal

Tuner Spec.

Remark

6700NFNS11E

LGIT

2.15 ± 0.05V

6700VS0002F

LGIT

3.0 ± 0.05V

65dBu

TAEA-H111F

Korea

65dBu

TAEW-G002D

6700PF0006B

SANYO

PAL

2.3 ± 0.05V

65dBu

115-B-A86EL

PAL

6870NB0026A

LGIT

2.15 ± 0.05V

65dBu

TAEA-J001F

HITACHI

6700MF0014A

LGIT

2.3 ± 0.05V

65dBu

TAEW-G013D

PAL

6700MF0018A

LGIT

2.5 ± 0.05V

65dBu

TAEA-G011D

SECAM(CIS)

6700MF0018B

LGIT

2.4 ± 0.05V

65dBu

TAEA-G001D

PAL

6700MF0018D

LGIT

2.4 ± 0.05V

65dBu

TAEA-G011D

PAL

6700MF0018E

LGIT

2.5 ± 0.05V

65dBu

TAEA-G111D

SECAM(CIS)

1) Degaussing Coil 2) Convergency fixing instrument (Speical tools)

(2) Adjustment Preparation 1) Operate the unit at least 15 minutes before adjustment.

2) Using degaussing coil, remove the stains on CPT & Cabinet.

3) Received the Cross Hatch Pattern of Convergence. (09ch) 4) Let the Contrast in normal luminance level.

(3) Static Convergence (STC) Adjustment 1) Receive the Cross Hatch Pattern Convergence (09ch).

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-4-

LGE Internal Use Only

2) Before adjusting Static Convergence (STC), adjust the focus first seeing to it that the WHITE color picture quality is sharp enough.

3) Converge the RED vertical and BLUE vertical line in unity (same line) by changing the angle between the 2 tabs of 4-pole magnet.

4) Converge the RED horizontal and BLUE horizontal line in unity(same line) by turning the 2 tabs of the 4-pole magnet. At this time, do not change the angle between the 2 tabs.

5) Converge the R, G, B vertical line in unity (same line) by changing the angle between the 2 tabs of the 6-pole magnet.

6) Converge the R, G, B horizontal line in unity(same line) by turning the 2 tabs of the 6-pole magnet. At this time, do not change the angle between the 2 tabs.

light with B-BIAS to have the color temperature as shown below. e. Repeat steps a~d until both low and high light have the same readings as shown below.

Market

Color Temperature

ALL

13,000

X-AXIS

Y-AXIS

268±5

273±5

7. Focus Voltage Adjustment This adjustment must be done after operating the TV set receiver sufficiently.

7-1. Adjustment Preparation Receive LG standard pattern (NTSC: Crosshatch pattern, Ch.09) and set the picture condition on “APC ON”(CLEAR) mode.

7-2. Adjustment

(4) Dynamic Convergence (DYC) Adjustment 1) Y-axis Adjustment: Adjust convergence of Y-axis (vertical) by moving the deflection yoke (DY) left and right.

2) X-axis Adjustment: Adjust convergence of X-axis (horizontal) by moving the deflection yoke (DY) up and down.

Turn the focus volume on the FBT upper direction to have the best focus vertical line (Fig. 1(a)) and horizontal line (Fig. 1(b)) as shown below

(a)

6. White Balance Adjustment 6-1. Necessary Instrument

(b)

1) Automatic White Balance Meter (Low/High light Pattern generator) 2) CRTColor Analyzer, CA -100: 1 set 3) Factory Remote Control

<Fig. 1> In ultra NTSC model, do in the signal of Ch.09 (Crosshatch pattern) refer to <Fig. 2>

6-2. Adjustment Preparation Prior to this adjustment, the Screen Voltage adjustment should be finished.

6-3. Automatic adjustment 1) Adjust using Auto White Balance Meter.

2) Enter CPU OFF Mode by pressing “IN-START” & “MUTE” key of factor remote control in turn before adjustment.

Exit CPU OFF mode by press the “MUTE” key of factory remote control after adjustment finished. * In case there is excess RED color at screen voltage adjustment, adjust it using “volume - (F) key of factory remote control until the RED color disappear.

6-4. Manual adjustment 1) Adjust using white Balance meter and factory remote control.

2) Enter white balance adjustment mode by pressing “INSTART” key of factory remote control.

3) Use the CHD, CHE Key to choose adjustment item.

4) Use the VOLF, VOLG Key to change item data.

5) Adjustment Procedure a. Make the picture luminance 45Ft-L by changing the “CONTRAST” and “BRIGHTNESS”. b. Adjust X data of High light with R-DRIVE and Y data of high light with B-DRIVE to have the color temperature as shown below. c. Make the picture luminance 4.5Ft-L by changing the “CONTRAST” and “BRIGHTNESS”. d. Adjust X data of low light with R-BIAS and Y data of low

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

<Fig. 2>

8. SUB-BRIGHTNESS Adjustment This adjustment must be done after White balance adjustment.

8-1. Adjustment Preparation 1) Receive LG standard Mono scope pattern. (14CH) 2)Set the picture condition on " APC ON" (CLEAR) mode.

8-2. Adjustment

-5-

1) Press the “ADJ” key of the factory remote control twice to enter to “SUB-BRIGHTNESS” adjustment mode.

2) Change the Sub-Brightness data by pressing the VOLF, VOLG key so that the number 1 in gray scale of mono scope pattern almost disappear . In the ultraslim , do until the number "1" completely disappear.

See <Fig. 3>

LGE Internal Use Only

0

1 2

3

4

5 6

7 8

9

the left and right and the remotest grid will correspond to the effective boundary surface. (The remotest grid PAL: within 0~25%; NTSC: within 2.5~3.0 column) 6) Parabora Adjustment Select SVC02(EW PARAB) and adjust so that the vertical line of the remotest grid at the left or right side of the screen will be parallel to the vertical line of the center of screen. (or the remotest grid of CPT) 7) Trapezoidal Adjustment Select SVC02(EW TRAPE) and adjust so that the width of the upper part of screen is alike with the one of the lower part of the screen.

8) EW UPCOR / LOCOR Adjustment Select SVC02(EW UPCOR, EW LOCOR) and adjust so that the vertical line in the four corners become straight line.

9) BOW Adjustment Select SVC02(HP BOW) and adjust so that the vertical line in the four corners become straight line.

Gray Scale Color Bar

<Fig. 3> MONO SCOPE Patter Signal

8-3. Sub-Tint adjustment This adjustment has to be done only if the picture has bad tint otherwise, it can be omitted if the picture has good tint.

1) Receive LG standard pattern signal (SMPTE, 2CH) 2) Set the picture condition on “APC ON” (CLEAR) mode.

3) Press the “ADJ” key of the factory remote control three times to enter to “SUB-TINT” adjustment mode.

4) Change the Sub-Tint data by pressing the VOLF, VOLG key until the upper and lower CYAN color becomes same color.

9. Deflection setting data adjustment These adjustment will be done by automatic adjustment Equipment.

For manual adjustment, it is also possible by the following procedure.

10. IIC BUS SUB Adjustment Data Table OSD SUB-BRIGHTNESS SUB-TINT

9-1. Adjustment Preparation 1) Deflection setting data adjustment can be done only with remote control.

2) Press “IN-START” key on factory remote control continuously to enter to Deflection Adjustment mode.

3) Press the CHD, E key to select adjustment item.

4) Press the VOLF, G key to change the data.

Range 0 ~ 100 -20 (R) ~ +20 (G)

PAL 40 R5

NTSC Secam 40 40 R1 R5

11. Auto Adjustment Preparation Setting Table

9-2. Adjustment

VIDEO IC BA

SLave ADD

R BIAS

B DRIVE

B BIAS

Sub Add

D

A

F

C

Start Bit

6

7

6

7

Stop Bit

0

0

0

0

Masking

0

0

0

0

Direction

1

1

1

1

8D

8A

8F

8C

3

3

3

3

Sub Add SpeedPlus Step/Data

Delay 5

B AMP

B CUT G AMP G CUT

PC

R DRIVE

EEPROM

Speed 1

TV

VCD

1) Horizontal Position Adjustment Select SVC02(H-POS) and adjust so that the left and right vertical line are symmetrical as possible.

2) Vertical Position Adjustment Select SVC02(V-POS) and adjust so that the horizontal center line coincide with geometric horizontal center of the CPT. 3) Vertical Size Adjustment Select SVC02(VA) and adjust so that the middle circle of the Digital Pattern(480NC, 13CH) coincide with the effective screen of CPT.

EEPROM A0

9-3. Adjustment (21'' Superslim, Ultra S/S Model) 1) Vertical Position Adjustment Select SVC02(V-POS) and adjust so that the horizontal center line coincide with geometric horizontal center of the CPT. 2) Vertical linearity Adjustment Select SVC02(V-LIN) and adjust so that the size of the upper circle is alike with the one of the lower circle at LG standard pattern (PAL: EU05CH, NTSC: 13CH) 3) Vertical Size Adjustment Select SVC02(VA) and adjust so that the middle circle of the Digital Pattern(480NC, 13CH) coincide with the effective screen of CPT. 4) Horizontal Position Adjustment Select SVC02(H-POS) and adjust so that the left and right vertival line are symmetrical as possible.

5) Horizontal Size Adjustment Select SVC02(EW WIDTH) and adjust so that the outer line of

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-6-

LGE Internal Use Only

12. EEPROM OPTION TABLE (ULTRA SLIM / NTSC) You can find the EEPROM Option Data if entering the IN-START key of the adjustable remote control and then pressing the MENU key.

See <Table 1>

Inicial

Opción 1

CODE

CPT

0/1

0: Slim/Ultra, 1:Normal/Flat

1

Observación

XD MENU

0/1

1: With; 0: Without

1

TURBO SND

0/1

1: With; 0: Without

1

V-CURVE

0/1

1: Volume Curve high; 0: Volume Curve low

0

V-MUTE

0/1

1: With Video Mute; 0: Without

0

SND MUTE

0/1

1: With Sound Mute(no signal);0: Without(no signal)

1

SUB ADJ

0/1

1: SUB ADJ.CH.FIX(SUB:14CH,TINT:02CCH); 0: Without

0

AV MULTI

0/1

1: With; 0: Without

Opción 2

CODE

DVD

0/1

1: With DVD input; 0: Without

0

REMARK

0

Observación

Inicial

EYE

0/1

1: With; 0: Without

0

GAME

0/1

1: With Game Module ; 0: Without

0

X-WAVE

0/1

1: With Blue Back; 0: Without X-WAVE

0

COLOR T

0/1

1: Color+10 STEP; 0: -

Opción 3

CODE

AUTO DE

0/1

1: With NTSC system; 0: Without 1: SYNC KILL=1(no signal); 0: SYNC KILL=0 (no signal)

REMARK

0

Observación

Inicial

REMARK

1

SYNC KiI

0/1

Opción 4

CODE

LANGUAGE

0

0: ENG (ENG)

1

1: ARAB (ENG/FRE/ARAB/URUD)

2

2: FARSI (ENG/FARSI)

Observación

1

Inicial

REMARK

0

SND MODE

0/1/2

0: MONO; 1: AV STEREO; 2: RF STEREO

2

AV

0/1/2

0: NO AV; 1: AV1; 2: AV1 2

1

LOC KEY

0/1/2

0: 4 KEY; 1: 6 KEY; 2: 8 KEY

1

TXT LANG

0/1/2/3

0: EU WEST; 1: EU EAST; 2: ARABIC 3: FARSI

3

<Table 1>

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-7-

LGE Internal Use Only

<TABLE 2 > SVC

SVC 01

Range

Register RF AGC R BIAS G BIAS

0 ~ 63 0 ~ 255 0 ~ 255

B BIAS R DRIVE G DRIVE B DRIVE Y-DELAY OSD CONT. OSD POS. V POS

0 ~ 255 0 ~ 127 0 ~ 127 0 ~ 127 0 ~ 15 0~7 0 ~ 60 0 ~ 15

Initial(NTSC) 28 100 90 127 100 100 85 100 7 5 38 4 5 4 3

V LIN

0 ~ 31

18 17 17 18

VA

0 ~ 127

38 53 12 18

H POS

0 ~ 31

24 28 24 20

SVC 02

EW WIDTH

0 ~ 127

58 100

EW PARAB

0 ~ 127

26 22

EW TRAPE

0 ~ 127

18 12

EW UPCOR

0 ~ 31

13 16

0:normal mode 1:corner pin gain up mode

0

EW COR

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-8-

Remark Necessary Necessary Others CPT IRICO CPT Unnecessary Necessary Necessary Unnecessary Necessary Unnecessary Unnecessary Unnecessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Unnecessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Ultra 2 LG CPT Ultra HF CPT FLAT HF CPT FLATIRICOCPT FLAT LG CPT Necessary Unnecessary

LGE Internal Use Only

SVC

SVC 02

SVC 03

Register HP BOW HP ANGLE HS COMP V SC V COMP HS COMP V DC VBLK SW H BLK L H BLK R EW Cor DEEM TC FM GAIN A2 SW SIF SYS CH CONV FM MUTE VOL FIL VOLUME L AUDIO SW SURR CNT MONO VOLUME R TONE ATT T BOOST C TREBLE PSEUDO ST BBOOST C BASS GA S TRAP S TRAP SW F DDS DELAY T Y FILTER C FILTER Y APF COR GAIN P SHOOT O SHOOT WPL OPE GAMMA ST

SVC 04 DC REST BS START

BS GAIN C TRAP C BPF GAMMA GA GRAY MDE YCMIX TXT CC VIN/XRGB

Range 0 ~ 31 0 ~ 31 0~7 0~7 0~7 0~7 0 ~ 63 0~3 0~7 0 ~7 0: Normal mode; 1: Corner pin gain up mode 0: 50us ; 1: 75us 0: 500mVrms@± 50KHz. deviation (for PAL) 0: Normal mode; 1: 5.74MHz mode need to set SIF system=1 0: 4.5MHz; 1: 5.5MHz; 2: 6.0MHz; 3: 6.5MHz 0: Normal BPF mode; 1: CH converter measure mode at India 0: Enable FM output; 1: Disable FM output 0: Filter OFF; 1: TV operating mode 0 ~ 127 MONO Mode: 0 (0: Stereo EXT; 1: Stereo INT) MONO Mode: 1 (0: MONO CH1; 1: MONO CH2; 0: MONO CH3; 1: MONO CH4) 0: Surround OFF; 1: MODE-A (-3dB); 2: MODE-B (0dB); 3:MODE-C(+3dB) 0: STEREO input mode; 1: MODE input mode 0 ~ 127 0: 0dB; 1: -6dB 0: Cut; 1: Boost 0 ~ 63 0: Pseudo Stereo OFF; 1: Pseudo Stereo ON 0: Cut; 1: Boost 0 ~ 63 0 (min) ~ 7 (max) 0: Sound trap OFF mode (need external trap); 1: Normal mode (sound trap ON) 0: Normal mode (NTSC: work; PAL/SECAM: stop); 1: Forced DDS mode (always work) Delay Test 0: 3.58MHz Trap; 1: 4.43MHz Trap; 2: Wide mode; 3: 4.286MHz Trap 0: 3.58MHz peaking; 1: 3.58MHz symmetrical; 2: 4.43MHz peaking; 3: 4.43MHz symmetrical 0: Chroma trap ON (composite video mode) 1: Chroma trap OFF (YCbCr mode and YC mode) 0: Coring OFF; 1: Coring Gain 1(minimum); 2: Coring Gain 2(middle); 3: Coring Gain 3(maximum) 0 (narrow) ~ 3 (wide) 0 (narrow) ~ 3 (wide) 0: WPL OFF; 1: High operating point; 2:Middle operating point; 3: Low operating point 0: Low operating point; 1: Middle operating point; 2: High operating point; 3: Defect 0: 100%; 1: 107%; 2: 113%; 3: 129% 0: Black Stretch ON (Starting Point=401RE); 1: Black Stretch ON (Starting Point=501RE) 2: Black Stretch ON (Starting Point=601RE) 3: Black Stretch OFF 0 (min) ~ 2 (max) 0 (min) ~ 7 (max) 0 (min) ~ 3 (max) 0 (min) ~ 3 (max) 0: White (70%); 1: Gray (15%) 0: YC_C; 1: 2.2V_DC 0: Output without LPF; 1: Output by LPF 0: FBP/EXT RGB IN; 1: YC-C/DVD-Y/CR-IN/CB-IN

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

-9-

Initial(NTSC) 18 16 16 7 18 7 7 24(55) 0(1) 4 4 0 1 1 0 0 0 0 1 33 0

Remark Necessary Ultra HF CPT Necessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

0 0 33 0 1 18 0 1 63 7 1 0

Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

1 0 1

Unnecessary Unnecessary Unnecessary

0

Unnecessary

2

Unnecessary

0 0 0

Unnecessary Unnecessary Unnecessary

3

Unnecessary

1 0

Unnecessary Unnecessary

1 5 0 0 0 0 0

Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

1

Unnecessary

LGE Internal Use Only

SVC

SVC 05

SVC 06

Register T DISABLE H FREQ AFC G A MUTE V MUTE SYN KILL V KILL VSEP V RES T HLVDET V SYN CD MODE FBPBLK AFC NST AFC2SW CROSS BW BLK DEF. SUB BIAS V TRANS DIG OSD RGB CONT RGB TEMP ACL DEF. ACL SW ABL DEF. MID STP ABL TH VXO ADJ CrCb IN C EXT C BYPASS C KI ON C KI OFF C KI OPE GRN ADJ TINT TH ID KILL CVCO ADJ VCO CNTR FSC/STOP C SYS RY BY GA RY BY AN R-Y LEVEL B-Y LEVEL GY AMP HTNo CIr VXO Free

SVC 07

VXO Stby IF AGC SVO SW VIF SYS V LEVEL OM TYPE OM SW OM LEVEL VCO FREQ AMONI SW AFT SENS

Range 0: Test mode; 1: TV operating normally 0 ~ 63 0: Automatic mode; 1: Enforce high gain mode 0: Audio Mute OFF; 1: Audio Mute ON 0: Video Mute OFF; 1: Video Mute ON 0~1 0: TV operating mode; 1: Defeat the vetical output 0: Normal mode; 1: Sensitivity up mode 0: Normal mode; 1: Sensitivity up mode 0: If H-Lock is not defect, stop vertical sync detection 1: V sync system always working 0~7 0~1 0: Normal mode; 1: Enforce low gain mode (non-standard) 0: About 4us ~ 8us; 1: about 8us ~ 12us 0: TV operating mode; 1: Black pattern; 2: White pattern; 3: Crosshatch pattern 0: Blanking ON (normal mode); 1: Blanking OFF 0 ~ 127 0: Random transmission; 1: Transmission between vertical retrace period 0: Analogue OSD mode; 1: Digital OSD mode 0 ~ 15 0: -1VBE; 1: Flat 0: ACL Defect OFF; 1: ACL Defect ON 0: High sentivity; 1: Low sentivity 0: ABL Defect OFF; 1: ABL Defect ON 0: Enable limit operating; 1: Disable limit operating 0~7

Initial(NTSC) 1 70 0 1 0 0 0 0 0 1

Remark Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

0 0 1 0 0 0 0 35 1 0 8 0 0

0 0 7 4 2 1 0

Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

8 10 16 12 10 0 0 0 0 0 1 4 0 0 0 100 0

Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

0

Unnecessary

15

Unnecessary

? ? ? ? ? ? ? ? ? ? ? ? ? ?O@?he? ?@@@@?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? @?he? ?@@@@@@@h? ? ? ? ? ?

0 1 3 ? ? ? ? ? ? ? ? ? ? ? ? ? ?@@@@@@?g? ?@@@@@@?g?

J(M?he?

7Yhf? @@6Xhe? @@@)X?h? ?I'@)Xh? V4@1h? ?@h? ?@h? ?@h?

J5h? ?W.Yh? ?'6KO.Y?h? ?V4@0Yhe? ? ? ? ? ?

0: Video; 1: CbCr 0: Internal composite video signal; 1: From pin 2 input 0: Bypass OFF; 1: Bypass ON (used in Y/C mode) 0: Automatic mode (TV in operation); 1: Enforce killer ON when color control is min 0: TV in operation; 1: Test mode, killer circuit is not in operation 0 ~ 7 (-30dB ~ -40dB) 0 ~ 7 (Auto green off ~ level high) 0: Normal mode; 1: Tint control set center value (cann't control tint) 0: Easy to become NTSC; 1: Easy to become PAL 0~7 0: Normal mode; 1: VCO free run mode 0: FSC OUT; 1: EHT 0: PAL/NTSC/4.43 NTSC (AUTO); 1: PAL-M/PAL-N/NTSC(AUTO) 2: PAL; 3: PAL-M; 4: PAL-N; 5: NTSC; 6: 4.43NTSC; 7: Not available 0 ~ 15 0 ~ 15 0 ~ 31 0 ~ 31 0 ~ 15 0: Color ON; 1: Color OFF 0: Normal mode;1: VXO free run mode 0: Normal mode;1: VXO Standby mode 0: Normal mode; 1: Minimize the gain of VIF amplifier 0: Internal Video out mode; 1: Selected External video output mode 0: 38.0 MHz; 1: 38.9MHz; 2: 39.5MHz; 3: 45.75MHz 0~7 0: APC Voltage sample holde circuit type; 1: APC detector stop type 0: Normal mode; 1: Over modulation measure circuit ON 0 ~ 15 0 ~ 255 0: Normal mode (de-empasis FM detector); 1: SAO mode at external audio input mode 0: ±200KHz (4.5-0.5v change); 1: ±150KHz (4.5-0.5v change) 2: ±100KHz (4.5-0.5v change); 3:±50KHz (4.5-0.5v change)

VCO ADJ

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

- 10 -

0 0 0 0 0 ? ? ? ? ? ? ? ? ? ? ? ? ?

W&h? ?W&@h?

W&@@h?

7Y@@h? ?J5?@@h?

W.Y?@@h? ?O.Ye@@h? @@Y?e@@h? @@@@@@@@@@g? @@@@@@@@@@g? @@h? @@h? @@h? @@h? @@h? ? ? ? ? ?

LGE Internal Use Only

SVC

SVC 08

SVC 09

Register VIDEO SW SYNC SS DinterLace OE TEST Ext RB Ext GB Ext BB Ext RDr Ext GDr Ext BDr MONI C2 DDS BPF BELL ADJ BELL MONI S KIL OPE S KIL ON S KIL OFF BellBypas Text Hpos Text VPos DE EM SW CIK STOP TEST MODE MONI cbcr IF TEST DVD VOL MAX VOL CLPDEL50 CLPDEL60 CLPLEN CLMPID PIP H S KIL ON S KIL OFF BellBypas Moni cbcr SAP sens

STE sens

SAP LEVEL

Range 0: Internal; 1: External; 2: DVD-Y; 3: YC-Y 000: Low (sync tip side); 100: Middle (normal); 111: High (pedestal side) 0: Normal mode; 1: Deinterlace mode Ext R Bias setting Ext G Bias setting Ext B Bias setting Ext R Drive setting Ext G Drive setting Ext B Drive setting DDS Band Pass Filter Secam IC Only Secam IC Only Secam IC Only Secam IC Only Secam IC Only Secam IC Only Text Only Text Only

3 3

0:NORMAL ~ 100:Min(Reduce DVD Volume) Only for hotel model PIP PIP PIP PIP PIP SECAM ONLY SECAM ONLY SECAM ONLY SECAM ONLY BTSC only 0:17% 1:24% BTSC only 0:38% 1:47% BTSC ONLY 0:-11dBV 1:-5.5dBV

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

Initial(SECAM) 0 3 0 0 8 8 8 8 8 8 0 2

100 18 18 2 1 2 0 0 0 0 1

0

0

- 11 -

Remark Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary

LGE Internal Use Only

TROUBLE SHOOTING 1. TV FUNCTIONAL 11100

TUNER / IF

12500

VIDEO/MICOM

13100

SOUND

18200

18100

SMPS

14400

HORZ. DEFL

15300

VERT. DEFL

16100

CPT

Secondary

SMPS Primary

2. TU / IF SECTION 11100

TUNER

11100

2

7

8

10 3

TUNER/IF

6

4

11101

11

(TU101)

9

5

1

11102

11104

11103

CONTROL SECTION

TUNER INPUT SECTION 5V(ZD102,C108,C106)

SDA(R514)

30V(C103,C107,ZD103,R150)

SCL(R516)

VIDEO/SOUND BUFFER

MOD. CONTROL SECTION

IF(Z111,C101,R100)

AGC(C110,R151,J108,R109 ,R154,R108)

TUNER Not Working

TUNER Not Working

TU SEARCH Problem

TU SEARCH Problem

TUNING Problem

TU Weak Picture Signal

No Video Signal

No Sound Signal

TV system Detection Problem

Video S/N Problem

Sound S/N Problem

TV MODE Weak Picture Signal

Video Noise· No

Sound Noise

3. VIDEO PROCESSING 12511

12500 VIDEO/MICOM

R/C RECEIVER PA01,R82,C30,C28, In case of influx NOISE

12508

R/C is not operate

SOUND Section

11100

12510

LED O/P Section

TUNER

R501,R504,C502,C506,C507

LD11,R58,R60,R72,Q10

R154,C101,Z111

12509

R622,R621 NO SOUND

KEY I/P Section

NO CH. SEARCH

SW11~SW16

NO PICTURE

R16,R17,R18,R19,R20,R66

NO SOUND.

12507 R/G/B DRIVE Section

KEY Error

R505~R510, C510

12500

C510,C511,R515

35,36,40 50~64

NO PICTURE

61 ~ 64 31,32

AUDIO L/R

46~49

LV762XX

17~22

12506 DEFLECTION SECTION R404,R512,R532,C512,C513

1~13

12502 REAR A/V

1 CHIP IC (IC501)

C515,C516,C517,C523,C544

04,09,35,4

DVD

12

41

Deflection Problem

9,62

Vertical/Horizontal Line

L IN: L221,C215 R IN: L222,C222

VIDEO

IN: L225,R226

DVD-Y,Pb,Pr

IN: C210,C211,C212

DVD-R

IN: L221,C215

DVD-L

IN: L222,C222

12505 12503 OSC SECTION (4.43MHz) X501,

12504 RESET SECTION R22,C15

R537 AUDIO/VIDEO No I/P, O/P

SET Maneuver defectiveness

POWER SUPPLY SECTION POWER ST-5V(C521,R528) RGB 9V(C510,C511,R515)

SET Maneuver defectiveness

IF VCC(C528,C526,L528,C547) VCC(C518,L503)

Clock Error

MENU Picture Error

SET Maneuver defectiveness

OSD Not Working

SET LATCH-UP

KEY Not Working No Sound

MENU Picture Error

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

- 12 -

LGE Internal Use Only

4. SMPS PRIMARY SECTION 18200

18103

18105 BRIDGE RECTIFIER

NO POWER NO STR VCCSUPPLY SO NO POWER FUSE OPEN & STR DAMAGED DUE TO CHANGE IN PRIMARY INDUCTANCE OF SMPS

18110

VD801(TVR621D) F801(T4AL250V)

NO POWER POWER RADIATION SAFETY PROBLEM

NO POWER FUSE OPEN NO RECTIFIER DC O/P

18106 START RESISTOR

NO MICOM CONTROL NO DEGAUSS PURITY PROBLEM

IC801(STR-W6754) SECONDARY LOAD REGULATION POOR OVER VOLTAGE PROT. NOT OPR. NO POWER / INTERMITANT NO POWER SWITCHING NOISE

D815,R804,R805,R810,R839 STR NO OPR./NO POWER EXCESSIVE I/P VOLTAGE CAUSES NO POWER/ NO OSCILLATIONS

18111 18205

R804,R805 STR SWITCH ON PROB. NO POWER

18108

STR VCC POWER SECTION

P801A/B,SW801

NO POWER FUSE OPEN

18104 RELAY(DEGAUSS) RL801,Q845,D847 TO DEGAUSS COIL

18101 AC INPUT

FUSE & VARISTOR

T802(150-F06T)

DB801(TS4B05G) T803

18102

FILTER SECTION

STR FEED BACK SECTION D845,R810,C840

LOAD REG. FB SECTION IC802,Q840,R808,R853,C852

STR NO OPR./NO POWER INTERMITENT NO POWER SECONDARY O/P VOLTAGE POOR INTERMITANT ST-BY MODE

SMPS SEC LOAD REG POOR INTERMITANT NO POWER

5. SMPS SECONDARY SECTION STRW6554

(S-Vcc)

17V 20V-(10W)

14V / 25mA

C831 (330u/25V)

D824 (SFAF504G)

(st-by 5V)

11V D813 (RU3AMV)

ST_BY 1W Option

KIA78L05BP

R873 (47/0.5W)

C826 (1000u/16V)

IC804

KIA78R09API

FBT Trans

IC803 5V_1 KIA7805API NT: 360mA PAL:465mA

3.3V Reg. 1.5V Reg.

C540 (4.7u/250V)

LA78040N (#2,Vcc)

D301 (RGP15J)) C309 (470u/35V)

112.17V / 395mA

110V D826 (RU3AMV)

110.1V

R833 (RS 0.47/2W)

1.8V

9V

R513 (RS 300) R529 (RS 68)

9V

R132 (RS 68)

9V

110.07V

L802 (82uH)

3.3V

LV76213(#62,#4 Vcc)

5.0V / 14mA

LA72730 (#8 Vcc)

5.0V / 40mA

LA72702N (#19 Vcc) LA42102 (#5,St-by)

85mA

LC75024E (3.3V Vcc)

5V 145mA.

IC 501 (Main IC) IC 751 (S/W IC ) IC 661 (RF STEREO NT) IC 601 (SOUND-amp) IC 807 (NICAM)

LC75024E (1.5V Vcc) FM TX, Game, USB OPT

3.3V / 10mA 5.0V / 13mA 8.0V / 15mA

LV76213(#9, Vcc)

IC 501 (Main IC 3.3V Vcc)

LV76213(#20, Vcc)

IC 501 (Main IC Hor Vcc)

LV76213(#49,Vcc)

IC 501 (Main IC RGB Vcc)

5V /75mA.

TUNER(Vcc)

109.63V / 380mA (105V~120V)

FBT B+

FR403 (RF 1.2/2W)

29.97V / 10mA

C831 (220u/160V)

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

5.0V / 231mA

60mA

R520 (RS 620)

9V 28.2V / 320mA

EEPROM (#8, Vcc)

R620 (RS 5.6/2W)

CPT Board

26V

IC 601 (SOUND-amp) 10W+10W ST

D-Coil Relay

ST-5V

184.47V / 18mA

D505 (RGP10J))

LA42102N (#7,Vcc)

ST-5V

T/X Pre-Amp

NT: 398mA PAL:503mA

180V

IC 601 (SOUND-amp) 5W+5 W ST

MAIN IC (#24, Vcc)

KIA78R05API D806 (TVR06J)

IC 601 (SOUND-amp) 5W MONO

LA42102 (#7,Vcc)

IC04

IC806

C838 (2200u/25V)

SMPS Trans

17V

LA42101 (#7,Vcc)

(28V~32V)

R107 (RS 12K/2W)

- 13 -

Tuner 30V

LGE Internal Use Only

6. VERTICAL SECTION 15300 VERTICAL IC(IC301)

V-IN

PUMP VVCC -UP GND OUT

O/STAGE

LA78141

15305 VERTICAL O/P DAMPING & FILTER R310,R315,C314,C305,C310

V-REF

15301 VERTICAL I/P R305,R309,R311,C322

V E R T

VERTICAL FOLDING VERTICAL ROLLING NOISE (HORZ LINE MOVING UP/DOWN)

VCT VERTICAL O/P RETRACE KINE VERT SIZE PROBLEM VERT IC O/P CAN DECIDE GAIN

D Y

15306 VETICAL REFERECE SECTION C313,C322 VERT SIZE PROBLEM VERT LINEARITY PROBLEM POWER OFF(PROTECTION ENABLED)

15303 VCC SECTION (24V) FR301,D301,C303,C309,C306

15308

15304 PUMP UP VCC C307,D302

FBT SEC O/P VCC FULL RASTER VERT. PROTECTION ENABLE CAUSES NO POWER

OUTPUT STAGE VCC SECTION

C307 VCT VERT. PROTECTION ENABLE POWER OFF

RETRACE LINE POWER OFF

7. HORIZONTAL SECTION 14401 H-OUT

HORZ DRIVE SECTION

R403,R401, 47V VCC

Q401,T403,C404 DEFLECTI0N PROB POWER OFF

14404

14402

HORZ. DEF

HORZ O/P SECTION

COMPENSATION SECTION

H O R

Q402,C414 C412 ,L401,L402, DEFLECTION PROB

Z

INEARITY ADJ NOT WORK

POWER OFF STRANGE NOISE

HORZ SIZE PROBLEM

D

STRANGE NOISE

Y

COLLECTOR

14410 HEATER VOLTAGE .FR401 X-RAY WORKING SAFETY PROB ROLLING PICT

180V VOLTAGE

FBT T402

FR501,D505,C540

HORZ LINE NO RETRACE

26V VOL

MAIN VCC(110V)

FR301,D301

ANODE FOCUS SCREEN

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

- 14 -

LGE Internal Use Only

8. SOUND PROCESSING SECTION ANT. Speaker 11500

TUNER

12500

1 CHIP IC

NICAM IC

(LV762XX)

(LC75024E)

13603

11100

Sound Amp.

13602

LA42102L(10W*2))

TUNER : RF signal is feed to TUNER through Antenna. IF output from Tuner is then given to 1 CHIP IC. 1 CHIP IC : 1 CHIP IC processes the input IF. Demodulates Picture and sound information and gives analog R G B output for Display and SPKL/R as audio output, this sound output is further Amplified and feed to speakers.

Sound Amp : Sound amps(LA42102L) is and Audio Amplifier it amplifies the output sound signal from Surround ic(LC75024E) and feeds to speaker which generates Sound.

9. CPT DRIVE SECTION 16100 CPT Board Circuit 11700 R G B AMP CIRCUIT

16101

L901 180V

R917

R923

R912

L902 R Q901

The CPT-BOARD assembly is composed of discrete type RGB Amplifier.

Q903

Amp- Gain is defined by Resistance of R917, R912,R923.

G

High Frequency compensation is made by inductance of L901,

L903

capacitance of C907,C904 and C902.

R915

DC level of emitter of Q901,Q902 and Q903 is defined by R908.

R916 C907

Q902

B R906

L904 R905

R921

C902

9V C904

R908

R922

D902

11500

VIDEO PROCESSING SECTION

16101 R,G,B Signal-IN L902, L903, L904

180V R

16100

16002

B

CPT CIRCUIT VCC / GND

1 Vcc 180V 5 GND

9V

16004 DISCHARGE PROTECTION CIRCUIT

L901

ONE SIGNAL R/G/B) MISSING NO PICTURE, CPT Dead

L902 Q901

ONE SIGNAL (R/G/B) MISSING

G

CPT DRIVE SECTION

L903

R915

L904

R916 C907 R905

CPT / e-GUN

Q902 R906

> > >

R921 C902

C904 R922

R908 D902

16005 Spot Killer CIRCUIT C901, R902, D903

SPOT & TRAY

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

- 15 -

17006 Heater Voltage FR932 e-GUN Dead e-GUN LIFE DECREASE

LGE Internal Use Only

EXPLODED VIEW

IMPORTANT SAFETY NOTICE 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.

943 400

170 112 913

174

150

510 (option)

120 300 520

590

311 530 310 540 330

CopyrightŠ2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

- 16 -

LGE Internal Use Only

DIAGRAMA ESQUEMÁTICO

2009

P/NO.:3854VA0196D (08.04.14)

DIAGRAMA EN BLOQUE

TABLERO DE CIRCUITO IMPRESO MAIN & CPT

Option Par t

AC ST-BY

IIC Bus Line

INPUT

TRANS (1W Opt)

CPT DRIVE MONO MONO

L-OUT

LA42101 LA42101 R-OUT

STEREO, STEREO,

SPK1.

SPK2.

From

IC803 IC803

R620 R620

IC804

5V 5V

7.5V 7.5V

SOUND SOUND AMP. AMP. LA42102(N) LA42102(N) RIN-TV

23 24

LIN-TV

18

2

5

IC751 IC751 LA72730 LA72730

9 14

3,6 11

1

4

7

21

SCL

19 20

5v

9v

9v

ST-5v

From

From

From

From

From

IC803 IC804 IC804 IC04

MONO ( ~A43K )

5V 5V

5V

B+ (110/115V) 14

V_DY

IC661 A2/NICAM

SIF IN

5

Ext R/L

EXT

IN

RGB

Video-in

9V

50

SPK L/R

51

OUT SIF

54

SDA SCL

64 61

5.1V

AV1(V/R/L)-IN

Z102 TUNER From USOC

Audio(Game) Video(Game)

(Mono)

5V 33V

TV IN(ST)

SAW SAW

M L-OUT

IF

OUT

4,5,6

IF

H-Vcc

VDD

5V

3.3V

8

HIC291 HIC291

8

CONTROL

LED & IR

Copyright©2009 LG Electronics.Inc. All right reserved.

Only for training and service purposes.

Rear_AV(1) Rear_AV(1) (( PHONE) PHONE)

5V

17

6

V-OUT

24V

22

2 10

EW-OUT

31 32

SDA SCL IC02 EEPROM

16

Vcc

SCART SCART

FBT

ABL

HEATER

3

B+

1

HDT Q402

FBP in

MD1803 IC401

JA01 DVD DVD

AFC

9

Collector

V-in

ST-5V

185V

8

24C04/16

B

7

Vcc

H-OUT

10 11 13

33

R,G,

Game Game Pack(Game Pack(Game Opt) Opt)

24

5V

USOC

SDA SCL

9

19

Y(G)/Cr(R)/Cb(B)

56

27 26

9V

RGB

IF IN

out

62

LA76213 LA76213

57

LC75024E

46~48

M_R/L OUT(ST)

7

49

FB

2

5

ID

LA72702

2

AV

1

12

V-OUT (Mono)

BTSC

From

10.5V

IC301

IC701

IC804

TRANS

STEREO ( ~ A43L)

SOUND SOUND

R610

IC804

12

R/L Out

17 18

10

9v

SDA

15

(STEREO (STEREO Opt) Opt)

SMPS

IC804 9V REG

Monitor V OUT(ST)

SDA SCL

(17V/11V)

ST-5V REG

9v

Sound Sound Max Max

AUDIO B+

9

IC04

SOUND SOUND AMP AMP

9

(100~240V)

TDA8145 EW IN

EW OUT

L401

(FLAT (FLAT OPT.) OPT.)

CPT(option)

POWER

LGE Internal Use Only