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LG 21SA1RL Service Manual

21SA1RG 21SA1RLX 21SA1RLX-4

Made by: LG
Type: Service Manual
Category: TV
Pages: 18
Size: 4.55 MB

 

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COLOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : CW81B

MODEL : 21SA1RL/RG/RLX

MODEL : 

21SA1RL/RG/RLX-L4

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

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

Aug., 2009

Printed in China

P/NO : MFL42466416

Internal Use Only

 


background image

- 2 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

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

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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- 3 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

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.

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 X-
radiation 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 & X-
radia

t

ion 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. Scope of Application

These instructions are applied to CW81B Chassis.

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 pre-
permitted 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)

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

1) Input in the 75

cable 65dB(±1dB) LG standard signal.

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

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.

4. Screen Voltage Adjustment

4-1. Adjustment 

(Using Factory Remote Control)

1) Input in the 75

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.)

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.

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.)

5-2. Convergency Adjustment

(1) Necessary Instrument

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).

G     R     B

- 4 -

ADJUSTMENT INSTRUCTIONS

G     R     B

R

G     R     B

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

6700NFNS11E

6700VS0002F

6700PF0006B

6870NB0026A

6700MF0014A

6700MF0018A

6700MF0018B

6700MF0018D

6700MF0018E

LGIT

LGIT

SANYO

LGIT

LGIT

LGIT

LGIT

LGIT

LGIT

2.15 ± 0.05V

3.0 ± 0.05V

2.3 ± 0.05V

2.15 ± 0.05V

2.3 ± 0.05V

2.5 ± 0.05V

2.4 ± 0.05V

2.4 ± 0.05V

2.5 ± 0.05V

65dBu

65dBu

65dBu

65dBu

65dBu

65dBu

65dBu

65dBu

65dBu

TAEA-H111F

TAEW-G002D

115-B-A86EL

TAEA-J001F

TAEW-G013D

TAEA-G011D

TAEA-G001D

TAEA-G011D

TAEA-G111D

Korea

PAL

PAL

HITACHI

PAL

SECAM(CIS)

PAL

PAL

SECAM(CIS)

Tuner P/N

Maker

AGC Vol

Signal

Tuner Spec.

Remark

 


background image

- 5 -

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.

(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.

6. White Balance Adjustment

6-1. Necessary Instrument

1) Automatic White Balance Meter (Low/High light Pattern

generator)

2) CRTColor Analyzer, CA -100: 1 set
3) Factory Remote Control

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 CH

D

, CH

E

Key to choose adjustment item.

4) Use the VOL

F

, VOL

G

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

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.

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

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

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

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 VOL

F

,

VOL

G

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>

Market         Color Temperature        X-AXIS          Y-AXIS

ALL                   13,000                    268±5            273±5

(a)

(b)

<Fig. 1>

<Fig. 2>

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


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- 6 -

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 VOL

F

, VOL

G

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.

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 CH

D

E

key to select adjustment item.

4) Press the VOL

F

G

key to change the data. 

9-2. Adjustment

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.

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

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.

10. IIC BUS SUB Adjustment Data

Table

11. Auto Adjustment Preparation

Setting Table

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

0

1

2

3

4

5

6

7

8

9

 Gray Scale

 Color Bar

<Fig. 3> MONO SCOPE Patter Signal

OSD

SUB-BRIGHTNESS

SUB-TINT

Range

0 ~ 100

-20 (R) ~ +20 (G)

PAL

40

R5

Secam

40

R5

PAL

40

R5

NTSC

40

R1

Speed

1

SLave ADD

VIDEO IC

BA

EEPROM

A0

Delay

5

EEPROM

Sub Add

8D

8A

8F

8C

SpeedPlus

Step/Data

3

3

3

3

Sub Add

Start Bit

Stop Bit

Masking

Direction

VCD

TV

PC

R DRIVE

D

6

0

0

1

R BIAS

A

7

0

0

1

B DRIVE

F

6

0

0

1

B BIAS

C

7

0

0

1

B AMP

B CUT

G AMP

G CUT

 


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- 7 -

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> 

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

<Table 1>

Opción 1

CPT

XD MENU

TURBO SND

V-CURVE

V-MUTE

SND MUTE

SUB ADJ

AV MULTI

Opción 2

DVD

EYE

GAME

X-WAVE

COLOR T

Opción 3

AUTO DE

SYNC KiI

Opción 4

LANGUAGE

SND MODE

AV

LOC KEY

TXT LANG

Inicial

1

1

1

0

0

1

0

0

Inicial

0

0

0

0

0

Inicial

1

1

Inicial

0

2

1

1

3

REMARK

REMARK

REMARK

REMARK

CODE

0/1

0/1

0/1

0/1

0/1

0/1

0/1

0/1

CODE

0/1

0/1

0/1

0/1

0/1

CODE

0/1

0/1

CODE

0

1

2

0/1/2

0/1/2

0/1/2

0/1/2/3

Observación

0: Slim/Ultra, 1:Normal/Flat

1: With; 0: Without

1: With; 0: Without

1: Volume Curve high; 0: Volume Curve low

1: With Video Mute; 0: Without

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

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

1: With; 0: Without

Observación

1: With DVD input; 0: Without 

1: With; 0: Without

1: With Game Module ; 0: Without

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

1: Color+10 STEP;  0: -

Observación

1: With NTSC system; 0: Without

1: SYNC KILL=1(no signal); 0: SYNC KILL=0 (no signal)

Observación

0: ENG (ENG)

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

2: FARSI (ENG/FARSI)

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

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

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

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

 


background image

- 8 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

<TABLE 2 >

SVC

SVC 01

SVC 02

Register

RF AGC

R BIAS

G BIAS

B BIAS

R DRIVE

G DRIVE

B DRIVE

Y-DELAY

OSD CONT.

OSD POS.

V POS

V LIN

VA

H POS

EW WIDTH

EW PARAB

EW TRAPE

EW UPCOR

EW COR

Range

0 ~ 63

0 ~ 255

0 ~ 255

0 ~ 255

0 ~ 127

0 ~ 127

0 ~ 127

0 ~ 15

0 ~ 7

0 ~ 60

0 ~ 15

0 ~ 31

0 ~ 127

0 ~ 31

0 ~ 127

0 ~ 127

0 ~ 127

0 ~ 31

0:normal mode

1:corner pin gain up mode

Initial(NTSC)

28

100

90

127

100

100

85

100

7

5

38

4

5

4

3

18

17

17

18

38

53

12

18

24

28

24

20

58

100

26

22

18

12

13

16

0

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

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Unnecessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Ultra 2 LG CPT

Ultra HF CPT

FLAT HF CPT

FLAT IRICO CPT

FLAT LG CPT

Necessary

Unnecessary

 


background image

- 9 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

SVC

SVC 02

SVC 03

SVC 04

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

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

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

0

0

33

0

1

18

0

1

63

7

1

0

1

0

1

0

2

0

0

0

3

1

0

1

5

0

0

0

0

0

1

Remark

Necessary

Ultra HF CPT

Necessary

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

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

 


background image

- 10 -

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

SVC

SVC 05

SVC 06

SVC 07

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

VXO Stby

IF AGC

SVO SW

VIF SYS

V LEVEL

OM TYPE

OM SW

OM LEVEL

VCO FREQ

AMONI SW

AFT SENS

VCO ADJ

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

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)

Initial(NTSC)

1

70

0

1

0

0

0

0

0

1

0

0

1

0

0

0

0

35

1

0

8

0

0

?

?

?

?

?

?

?

?

?

?

?

?

?

?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

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?

?

?

?

?

?

0

0

7

4

2

1

0

8

10

16

12

10

0

0

0

0

0

1

4

0

0

0

100

0

0

15

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

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

Unnecessary

 


background image

- 11 -

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

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

Initial(SECAM)

0

3

0

0

8

8

8

8

8

8

0

2

3

3

100

18

18

2

1

2

0

0

0

0

1

0

0

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

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


background image

- 12 -

VIDEO/MICOM

12500

TUNER / IF

11100

HORZ. DEFL

14400

SOUND

13100

VERT. DEFL

15300

SMPS

Secondary

18200

SMPS Primary

18100

CPT

16100

11100

TUNER

TUNER INPUT SECTION

5V(ZD102,C108,C106)

30V(C103,C107,ZD103,R150)

TUNER Not Working

TU SEARCH Problem

TUNING Problem

CONTROL SECTION

SDA(R514)

SCL(R516)

TUNER Not Working

TU SEARCH Problem

TU Weak Picture Signal

MOD. CONTROL SECTION

AGC(C110,R151,J108,R109

,R154,R108)

TV system Detection Problem

TV MODE Weak Picture Signal

VIDEO/SOUND BUFFER

IF(Z111,C101,R100)

No Video Signal

No Sound Signal

Video S/N Problem Sound S/N Problem

Video Noise·No

Sound Noise

11101

11102

11103

11104

TUNER/IF

(TU101)

6

11100

9

4

5

1

11

8

3

2

7

10

• R404,R512,R532,C512,C513

• C515,C516,C517,C523,C544

R501,R504,C502,C506,C507

R622,R621

SET Maneuver defectiveness

KEY Not Working No Sound

R22,C15

RESET SECTION

SET Maneuver

defectiveness

MENU Picture Error

SET LATCH-UP

POWER

ST-5V(C521,R528)

RGB 9V(C510,C511,R515)

IF VCC(C528,C526,L528,C547)

VCC(C518,L503)

POWER SUPPLY SECTION

1 CHIP IC (IC501)

LV762XX

61 ~ 64

31,32

1~13

12

41

17~22

12500 VIDEO/MICOM

46~49

TUNER

NO CH. SEARCH

NO PICTURE

NO SOUND.

X501,

R537

OSC SECTION (4.43MHz)

SET Maneuver

defectiveness

Clock Error

OSD Not Working

MENU Picture Error

L IN: L221,C215

R IN: L222,C222

IN: L225,R226

IN: C210,C211,C212

IN: L221,C215

IN: L222,C222

REAR A/V DVD

AUDIO/VIDEO No I/P, O/P

04,09,35,4

9,62

50~64

35,36,40

11100

12500

12502

12503

12504

12505

12510

12509

PA01,R82,C30,C28,

R/C RECEIVER

In case of influx NOISE

R/C is not operate

LD11,R58,R60,R72,Q10

LED O/P Section

SW11~SW16

R16,R17,R18,R19,R20,R66

KEY I/P Section

KEY Error

12511

R/G/B DRIVE Section

R505~R510, C510

C510,C511,R515

DEFLECTION SECTION

Deflection Problem

Vertical/Horizontal Line

NO PICTURE

SOUND Section

NO SOUND

12506

12507

12508

AUDIO L/R

VIDEO

DVD-Y,Pb,Pr

DVD-R

DVD-L

R154,C101,Z111

1. TV FUNCTIONAL

2. TU / IF SECTION

3. VIDEO PROCESSING

TROUBLE SHOOTING

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


background image

- 13 -

AC INPUT

P801A/B,SW801

FUSE & VARISTOR

NO POWER

FUSE OPEN

FILTER SECTION

T802(150-F06T)

RELAY(DEGAUSS)

RL801,Q845,D847

NO MICOM CONTROL

NO DEGAUSS

PURITY PROBLEM

BRIDGE RECTIFIER

DB801(TS4B05G)

NO POWER

FUSE OPEN

NO RECTIFIER

DC O/P

T803

NO POWER

NO STR VCCSUPPLY SO

NO POWER

FUSE OPEN & STR

DAMAGED DUE TO CHANGE

IN PRIMARY INDUCTANCE

OF SMPS

IC801(STR-W6754)

SECONDARY LOAD REGULATION POOR

OVER VOLTAGE PROT. NOT OPR.
NO POWER / INTERMITANT NO POWER

SWITCHING NOISE

START RESISTOR

R804,R805

STR SWITCH ON PROB.

NO POWER

STR VCC POWER SECTION

D815,R804,R805,R810,R839

STR NO OPR./NO POWER

EXCESSIVE I/P VOLTAGE CAUSES

NO POWER/ NO OSCILLATIONS

STR FEED BACK SECTION

D845,R810,C840

STR NO OPR./NO POWER

INTERMITENT NO POWER

SECONDARY O/P VOLTAGE POOR

INTERMITANT ST-BY MODE

LOAD REG. FB SECTION

IC802,Q840,R808,R853,C852

SMPS SEC LOAD REG POOR

INTERMITANT NO POWER

18101

18102

18103

18104

18105

18106

18108

18110

18111

18200

18205

NO POWER

POWER RADIATION

SAFETY PROBLEM

TO

DEGAUSS

COIL

VD801(TVR621D)

F801(T4AL250V)

4. SMPS PRIMARY SECTION

5. SMPS SECONDARY SECTION

STR-

W6554

C831

(220u/160V)

R107

(RS 12K/2W)

SMPS

Trans

(S-Vcc)

17V

20V-(10W)

LA42101 (#7,Vcc)

T/X Pre-Amp

110V

D824

(SFAF504G)

C831

(330u/25V)

11V

D813

(RU3AMV)

C826

(1000u/16V)

R873

(47/0.5W)

D-Coil Relay

MAIN IC (#24, Vcc)
EEPROM (#8, Vcc)

IC804

LV76213(#9, Vcc)

D826

(RU3AMV)

LV76213(#20, Vcc)

LV76213(#49,Vcc)

FBT B+

R833

(RS 0.47/2W)

L802

(82uH)

FR403

(RF 1.2/2W)

Tuner 30V

KIA78R09API

112.17V / 395mA

110.1V

110.07V

109.63V / 380mA

29.97V / 10mA

3.3V / 10mA

5.0V / 13mA

8.0V / 15mA

14V / 25mA

KIA78L05BP

IC803

R620

(RS 5.6/2W)

5.0V / 231mA

LV76213(#62,#4 Vcc)

LA72730 (#8 Vcc)

(st-by 5V)

(105V~120V)

(28V~32V)

NT: 398mA

PAL:503mA

KIA7805API

LA72702N (#19 Vcc)

TUNER(Vcc)

R529

(RS 68)

R513

(RS 300)

R520

(RS 620)

5.0V / 14mA

5.0V / 40mA

5V /75mA.

NT: 360mA

PAL:465mA

LC75024E (3.3V Vcc)

85mA

LA42102 (#7,Vcc)

IC 601 (SOUND-amp) 5W+5 W ST

LA42102N (#7,Vcc)

IC 601 (SOUND-amp) 10W+10W ST

IC 601 (SOUND-amp) 5W MONO

17V

ST_BY 1W

Option

D806

(TVR06J)

C838

(2200u/25V)

IC806

KIA78R05API

IC04

LA42102 (#5,St-by)

IC 751 (S/W IC )

IC 661 (RF STEREO NT)

IC 501 (Main IC)

IC 601 (SOUND-amp)

LC75024E (1.5V Vcc)

IC 807 (NICAM)

IC 501 (Main IC 3.3V Vcc)

IC 501 (Main IC Hor Vcc)

IC 501 (Main IC RGB Vcc)

180V

D505

(RGP10J))

C540

(4.7u/250V)

CPT Board

26V

D301

(RGP15J))

C309

(470u/35V)

LA78040N

(#2,Vcc)

184.47V / 18mA

28.2V / 320mA

FBT

Trans

FM TX, Game, USB OPT

60mA

5V

145mA.

3.3V Reg.
1.5V Reg.

ST-5V

ST-5V

5V_1

R132

(RS 68)

3.3V

1.8V

9V

9V

9V

9V

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


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- 14 -

VERTICAL IC(IC301)

LA78141

V-IN

VCC

GND

V-

OUT

PUMP

-UP

V

E

R

T

D

Y

VERTICAL I/P

VCT VERTICAL O/P

RETRACE KINE

VERT SIZE PROBLEM

VERT IC O/P CAN DECIDE

GAIN

VCC SECTION (24V)

FBT SEC O/P VCC

FULL RASTER

VERT. PROTECTION ENABLE

CAUSES NO POWER

PUMP UP VCC
C307,D302

RETRACE LINE

POWER OFF

VERTICAL O/P DAMPING

& FILTER

R310,R315,C314,C305,C310

VERTICAL FOLDING

VERTICAL ROLLING NOISE

(HORZ LINE MOVING UP/DOWN)

VETICAL REFERECE SECTION

C313,C322

VERT SIZE PROBLEM

VERT LINEARITY PROBLEM

POWER OFF(PROTECTION ENABLED)

OUTPUT STAGE VCC SECTION

C307

VCT VERT. PROTECTION

ENABLE

POWER OFF

15300

15301

15303

15305

15304

15306

15308

FR301,D301,C303,C309,C306

O

/S

TA

G

E

V-REF

R305,R309,R311,C322

6. VERTICAL SECTION

H

O

R

Z

D

Y

FBT

T402

HORZ DRIVE SECTION

R403,R401,

Q401,T403,C404

H-OUT

47V VCC

DEFLECTI0N PROB

POWER OFF

HORZ O/P SECTION

Q402,C414

HORZ. DEF

COMPENSATION SECTION

HEATER

VOLTAGE

.FR401
X-RAY WORKING

SAFETY PROB

ROLLING PICT

180V VOLTAGE

FR501,D505,C540
HORZ LINE

NO RETRACE

MAIN VCC(110V)

DEFLECTION PROB

POWER OFF

STRANGE NOISE

COLLECTOR

C412 ,L401,L402,

INEARITY ADJ NOT WORK

HORZ SIZE PROBLEM

STRANGE NOISE

ANODE
FOCUS
SCREEN

14401

14402

14404

14410

26V VOL

FR301,D301

7. HORIZONTAL SECTION

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


background image

8. SOUND PROCESSING SECTION

TUNER

LA42102L(10W*2))

NICAM IC

(LC75024E)

ANT.

Sound Amp.

Speaker

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.

11100

12500

13602

13

60

3

1 CHIP IC

(LV762XX)

11500

- 15 -

CPT CIRCUIT VCC / GND

Heater Voltage

e-GUN Dead

e-GUN LIFE

DECREASE

FR932

17006

16100

CPT DRIVE

SECTION

11500

VIDEO PROCESSING

SECTION

CPT / e-GUN

ONE SIGNAL R/G/B)

MISSING

NO PICTURE, CPT

Dead

16004

DISCHARGE

PROTECTION CIRCUIT

ONE SIGNAL (R/G/B)

MISSING

16101

R,G,B Signal-IN

L902, L903, L904

16005

Spot Killer CIRCUIT

SPOT & TRAY

C901, R902, D903

16002

Vcc 180V

1

5 GND

R

G

B

L902

L903

L904

R915

C907

R905

C904

R922

C902

R921

R906

R916

Q901

Q902

9V

R908

L901

180V

>

>
>

D902

9. CPT DRIVE SECTION

The CPT-BOARD assembly is composed of discrete type RGB

Amplifier.

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

High Frequency compensation is made by inductance of L901,

capacitance of C907,C904 and C902.

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

CPT Board Circuit

11700

16100

R G B AMP CIRCUIT

16101

R

G

B

L902

L903

L904

R915

C907

R905

C904

R922

C902

R921

R906

R916

Q901

Q902

9V

R908

L901

R917

R912

R923

Q903

180V

D902

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

 


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- 16 -

EXPLODED VIEW

400

943

913

112

510

(option)

520

174

120

300

310

530

311

540

330

590

170

150

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

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

 


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P/NO.:3854VA0196D  (08.04.14)

2009

DIAGRAMA ESQUEMÁTICO

 


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DIAGRAMA EN BLOQUE

LA76213

LA76213

DVD

(FLAT OPT.)

DVD

(FLAT OPT.)

CPT DRIVE

FBT

185V
AFC
ABL

HEATER

B+

HDT

Collector

AV1(V/R/L)-IN

USOC

AUDIO B+

B+

(110/115V)

(17V/11V)

SMPS

TRANS

SCL

SDA

EXT

Video-in

RGB

OUT

TUNER

V_DY

Rear_AV(1)

( PHONE)

Rear_AV(1)

( PHONE)

IC02

EEPROM

24C04/16

V-OUT

H-OUT

SPK1.

10.5V

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

SDA

SCL

LC75024E

A2/NICAM

MONO

SOUND AMP

LA42101

MONO

SOUND AMP

LA42101

AC

INPUT

(100~240V)

STEREO,

Sound Max

SOUND AMP.

LA42102(N)

STEREO,

Sound Max

SOUND AMP.

LA42102(N)

R610

5V

Option Part
IIC Bus Line

(M

on

o)

M

L-

O

U

T

31

22

17

5

46~48

STEREO

( ~ A43L)

MONO

( ~A43K )

12

9

3

9

8

10

2

6

24V

1

ST-BY

TRANS

(1W Opt)

57 56

64

9V

From

IC804

IC804

9V REG

IC04

ST-5V REG

9v

From

IC804

IC661

5V

5.1V

IC751 LA72730

(STEREO Opt)

IC751 LA72730

(STEREO Opt)

JA01

HIC291

Game Pack(Game Opt)

HIC291

Game Pack(Game Opt)

4,5,6

8

7

From USOC Video(Game)

Audio(Game)

54

SIF

out

IF

3,6 11 1 4 7

2 5 9

LA72702

BTSC

IC701

LIN-TV

RIN-TV

2

1

19 20 R/L Out

L-OUT

R-OUT

SAW

SAW

5

9

10

IF IN

Z102

10 11 13

14

15

12

SIF IN

32

61

V

-O

U

T

(M

on

o)

18

17 18

2 7

50

Ext R/L

IN

49

RGB

9V

SCL

SDA

27 26

33V

ST-5V

9v

From

IC804

9v

From

IC804

ST-5v

From

IC04

19

9

24

H-Vcc

5V

VDD

3.3V

Vcc

5V

9v

From

IC804

14

SOUND

5V

SOUND

5V

R620

7.5V

R620

7.5V

IC803

5V

IC803

5V

Q402

MD1803

IC401

TDA8145

IC301

V-in

FBP in

EW OUT

L401

Vcc

16

EW-OUT

EW IN

5v

From

IC803

62
IF

5V

SDA

SCL

23

24

SCL

SDA

51

SPK L/R

OUT

SCART

SCART

R,G,

B

8 33

FB

A

V ID

21

TV IN(ST)

M

_R

/L

O

U

T(

S

T)

Monitor V OUT(ST)

SPK2.

TABLERO DE CIRCUITO IMPRESO

MAIN & CPT

Copyright©2009 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

LGE Internal Use Only

CONTROL

CPT(option)

LED & IR

POWER