LG 42LB550A-TA, 42LB552A-TB Schematic

0 (0)

Printed in KoreaP/NO : MFL68180003 (1402-REV00)

LED TV

SERVICE MANUAL

North/Latin America http://aic.lgservice.com

Europe/Africa http://eic.lgservice.com

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

Internal Use Only

CHASSIS : LB45B

MODEL : 42LB550A 42LB550A-TA

42LB552A 42LB552A-TB

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

- 2 -

Only for training and service purposes

CONTENTS

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

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

SERVICING PRECAUTIONS .................................................................... 4

SPECIFICATION ....................................................................................... 6

ADJUSTMENT INSTRUCTION ................................................................ 9

TROUBLE SHOOTING GUIDE ............................................................... 13

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

DISASSEMBLY WORKING GUIDE ........................................................ 25

EXPLODED VIEW .................................................................................. 26

SCHEMATIC CIRCUIT DIAGRAM ..............................................................

- 3 -

Only for training and service purposes

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

Shock, Fire, or other Hazards.

Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the

servicing of a receiver whose chassis is not isolated from the AC

power line. Use a transformer of adequate power rating as this

protects the technician from accidents resulting in personal injury

from electrical shocks.

It will also protect the receiver and it's components from being

damaged by accidental shorts of th e cir cuitry that may be

inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown,

replace it with the specified.

When replacing a high wattage resistor (Oxide Metal Film Resistor,

over 1 W), keep the resistor 10 mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed

metallic parts of the cabinet, such as antennas, terminals, etc., to

be sure the set is safe to operate without damage of electrical

shock.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug removed from AC source, connect an

electrical jumper across the two AC plug prongs. Place the AC

switch in the on position, connect one lead of ohm-meter to the AC

plug prongs tied together and touch other ohm-meter lead in turn to

each exposed metallic parts such as antenna terminals, phone

jacks, etc.

If the exposed metallic part has a return path to the chassis, the

measured resistance should be between 1 MΩ and 5.2 MΩ.

When the exposed metal has no return path to the chassis the

reading must be infinite.

An other abnormality exists that must be corrected before the

receiver is returned to the customer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.

Do not use a line Isolation Transformer during this check.

Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor

between a known good earth ground (Water Pipe, Conduit, etc.)

and the exposed metallic parts.

Measure the AC voltage across the resistor using AC voltmeter

with 1000 ohms/volt or more sensitivity.

Reverse plug the AC cord into the AC outlet and repeat AC voltage

measurements for each exp ose d metallic par t. Any voltage

measured must not exceed 0.75 volt RMS which is corresponds to

0.5 mA.

In case any measurement is out of the limits specified, there is

possibility of shock hazard and the set must be checked and

repaired before it is returned to the customer.

Leakage Current Hot Check circuit

IMPORTANT SAFETY NOTICE

SAFETY PRECAUTIONS

- 4 -

Only for training and service purposes

SERVICING PRECAUTIONS

CAUTION: Before servicing receivers covered by this service

manual and its supplements and addenda, read and follow the

SAFETY PRECAUTIONS on page 3 of this publication.

NOTE: If unforeseen circumstances create conict between the

following servicing precautions and any of the safety precautions

on page 3 of this publication, always follow the safety precau-

tions. Remember: Safety First.

General Servicing Precautions

1. Always unplug the receiver AC power cord from the AC power

source before;

a. Removing or reinstalling any component, circuit board

module or any other receiver assembly.

b. Disconnecting or reconnecting any receiver electrical plug

or other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic

capacitor in the receiver.

CAUTION: A wrong part substitution or incorrect polarity

installation of electrolytic capacitors may result in an explo-

sion hazard.

2. Test high voltage only by measuring it with an appropriate

high voltage meter or other voltage measuring device (DVM,

FETVOM, etc) equipped with a suitable high voltage probe.

Do not test high voltage by "drawing an arc".

3. Do not spray chemicals on or near this receiver or any of its

assemblies.

4. Unless specied otherwise in this service manual, clean

electrical contacts only by applying the following mixture to the

contacts with a pipe cleaner, cotton-tipped stick or comparable

non-abrasive applicator; 10 % (by volume) Acetone and 90 %

(by volume) isopropyl alcohol (90 % - 99 % strength)

CAUTION: This is a ammable mixture.

Unless specied otherwise in this service manual, lubrication

of contacts in not required.

5. Do not defeat any plug/socket B+ voltage interlocks with which

receivers covered by this service manual might be equipped.

6. Do not apply AC power to this instrument and/or any of its

electrical assemblies unless all solid-state device heat sinks

are correctly installed.

7. Always connect the test receiver ground lead to the receiver

chassis ground before connecting the test receiver positive

lead.

Always remove the test receiver ground lead last.

8. Use with this receiver only the test xtures specied in this

service manual.

CAUTION: Do not connect the test xture ground strap to any

heat sink in this receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid-state) devices can be damaged eas-

ily by static electricity. Such components commonly are called

Electrostatically Sensitive (ES) Devices. Examples of typical ES

devices are integrated circuits and some eld-effect transistors

and semiconductor “chip” components. The following techniques

should be used to help reduce the incidence of component dam-

age caused by static by static electricity.

1. Immediately before handling any semiconductor component or

semiconductor-equipped assembly, drain off any electrostatic

charge on your body by touching a known earth ground. Alter-

natively, obtain and wear a commercially available discharg-

ing wrist strap device, which should be removed to prevent

potential shock reasons prior to applying power to the unit

under test.

2. After removing an electrical assembly equipped with ES

devices, place the assembly on a conductive surface such as

aluminum foil, to prevent electrostatic charge buildup or expo-

sure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder

ES devices.

4. Use only an anti-static type solder removal device. Some sol-

der removal devices not classied as “anti-static” can generate

electrical charges sufcient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate

electrical charges sufcient to damage ES devices.

6. Do not remove a replacement ES device from its protective

package until immediately before you are ready to install it.

(Most replacement ES devices are packaged with leads elec-

trically shorted together by conductive foam, aluminum foil or

comparable conductive material).

7. Immediately before removing the protective material from the

leads of a replacement ES device, touch the protective mate-

rial to the chassis or circuit assembly into which the device will

be installed.

CAUTION: Be sure no power is applied to the chassis or cir-

cuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replace-

ment ES devices. (Otherwise harmless motion such as the

brushing together of your clothes fabric or the lifting of your

foot from a carpeted oor can generate static electricity suf-

cient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropri-

ate tip size and shape that will maintain tip temperature within

the range or 500 °F to 600 °F.

2. Use an appropriate gauge of RMA resin-core solder composed

of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean and well tinned.

4. Thoroughly clean the surfaces to be soldered. Use a mall wire-

bristle (0.5 inch, or 1.25 cm) brush with a metal handle.

Do not use freon-propelled spray-on cleaners.

5. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature.

(500 °F to 600 °F)

b. Heat the component lead until the solder melts.

c. Quickly draw the melted solder with an anti-static, suction-

type solder removal device or with solder braid.

CAUTION: Work quickly to avoid overheating the circuit

board printed foil.

6. Use the following soldering technique.

a. Allow the soldering iron tip to reach a normal temperature

(500 °F to 600 °F)

b. First, hold the soldering iron tip and solder the strand

against the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the

component lead and the printed circuit foil, and hold it there

only until the solder ows onto and around both the compo-

nent lead and the foil.

CAUTION: Work quickly to avoid overheating the circuit

board printed foil.

d. Closely inspect the solder area and remove any excess or

splashed solder with a small wire-bristle brush.

- 5 -

Only for training and service purposes

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through

which the IC leads are inserted and then bent at against the cir-

cuit foil. When holes are the slotted type, the following technique

should be used to remove and replace the IC. When working with

boards using the familiar round hole, use the standard technique

as outlined in paragraphs 5 and 6 above.

Removal

1. Desolder and straighten each IC lead in one operation by

gently prying up on the lead with the soldering iron tip as the

solder melts.

2. Draw away the melted solder with an anti-static suction-type

solder removal device (or with solder braid) before removing

the IC.

Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and

solder it.

3. Clean the soldered areas with a small wire-bristle brush.

(It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor

Removal/Replacement

1. Remove the defective transistor by clipping its leads as close

as possible to the component body.

2. Bend into a "U" shape the end of each of three leads remain-

ing on the circuit board.

3. Bend into a "U" shape the replacement transistor leads.

4. Connect the replacement transistor leads to the corresponding

leads extending from the circuit board and crimp the "U" with

long nose pliers to insure metal to metal contact then solder

each connection.

Power Output, Transistor Device

Removal/Replacement

1. Heat and remove all solder from around the transistor leads.

2. Remove the heat sink mounting screw (if so equipped).

3. Carefully remove the transistor from the heat sink of the circuit

board.

4. Insert new transistor in the circuit board.

5. Solder each transistor lead, and clip off excess lead.

6. Replace heat sink.

Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as pos-

sible to diode body.

2. Bend the two remaining leads perpendicular y to the circuit

board.

3. Observing diode polarity, wrap each lead of the new diode

around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect (on the circuit board copper side) the solder joints of

the two "original" leads. If they are not shiny, reheat them and

if necessary, apply additional solder.

Fuse and Conventional Resistor

Removal/Replacement

1. Clip each fuse or resistor lead at top of the circuit board hollow

stake.

2. Securely crimp the leads of replacement component around

notch at stake top.

3. Solder the connections.

CAUTION: Maintain original spacing between the replaced

component and adjacent components and the circuit board to

prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit

board will weaken the adhesive that bonds the foil to the circuit

board causing the foil to separate from or "lift-off" the board. The

following guidelines and procedures should be followed when-

ever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the

following procedure to install a jumper wire on the copper pattern

side of the circuit board. (Use this technique only on IC connec-

tions).

1. Carefully remove the damaged copper pattern with a sharp

knife. (Remove only as much copper as absolutely necessary).

2. carefully scratch away the solder resist and acrylic coating (if

used) from the end of the remaining copper pattern.

3. Bend a small "U" in one end of a small gauge jumper wire and

carefully crimp it around the IC pin. Solder the IC connection.

4. Route the jumper wire along the path of the out-away copper

pattern and let it overlap the previously scraped end of the

good copper pattern. Solder the overlapped area and clip off

any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper pattern

at connections other than IC Pins. This technique involves the

installation of a jumper wire on the component side of the circuit

board.

1. Remove the defective copper pattern with a sharp knife.

Remove at least 1/4 inch of copper, to ensure that a hazardous

condition will not exist if the jumper wire opens.

2. Trace along the copper pattern from both sides of the pattern

break and locate the nearest component that is directly con-

nected to the affected copper pattern.

3. Connect insulated 20-gauge jumper wire from the lead of the

nearest component on one side of the pattern break to the

lead of the nearest component on the other side.

Carefully crimp and solder the connections.

CAUTION: Be sure the insulated jumper wire is dressed so the

it does not touch components or sharp edges.

- 6 -

Only for training and service purposes

SPECIFICATION

NOTE : Specifications and others are subject to change without notice for improvement

1. Application range

This specification is applied to the LB45B chassis.

2. Requirement for Test

Each part is tested as below without special appointment.

(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C

(2) Relative Humidity: 65 % ± 10 %

(3) Power Voltage

: Standard input voltage (AC 100-240 V~, 50/60 Hz)

* Standard Voltage of each products is marked by models.

(4) Specification and performance of each parts are followed

ea ch dra wing and speci ficat ion by part number in

accordance with BOM.

(5) The receiver must be operated for about 5 minutes prior to

the adjustment.

3. Test method

1) Performance: LGE TV test method followed

2) Demanded other specification

- Safety : CE, IEC specification

- EMC : CE, IEC

4. Model General Specification

* HDMI 1.4 with Deep Color is only apply for FHD Model

No. Item Specication Remarks

1. Market NON EU

2. Broadcasting system

PAL/SECAM B/G/D/K,

PAL I, NTSC-M PALB/B

3. Channel Storage

BAND PAL(BG,I) NTSC(M) China(DK)

VHF/UHF 01-C69 2~78 C1~C69

Cable S1~S47 1~71 S1~S47

4. Receiving system Upper Heterodyne

5. Video Input PAL, SECAM, NTSC Rear (2EA)

6. Component Input Y/Cb/Cr, Y/ Pb/Pr Rear (1EA), Except RGB PC Models

7. USB Input MP3, JPEG,Movie Side (1EA)

8. AV Audio Output RCA-RF/AV/HDMI Audio Output Rear (1EA)

9. D-SUB RGB-PC or Service Only Rear (1EA)

10. HDMI Input HDMI-DTV, Only PCM MODE AV input 2EA

11. Audio Input (1EA) AV&Component &PC 2EA

- 7 -

Only for training and service purposes

5. Component Video Input(Y, PB, PR)

No Resolution H-freq. (kHz) V-freq. (Hz) Pixel clock (MHz) Proposed

1 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)

2 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)

3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz

4 720*480 31.47 59.94 27.000 SDTV 480P

5 720*480 31.50 60.00 27.027 SDTV 480P

6 720*576 31.25 50.00 27.000 SDTV 576P 50Hz

7 1280*720 44.96 59.94 74.176 HDTV 720P

8 1280*720 45.00 60.00 74.250 HDTV 720P

9 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz

10 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,

11 1920*1080 33.72 59.94 74.176 HDTV 1080I

12 1920*1080 33.75 60.00 74.25 HDTV 1080I

13 1920*1080 56.25 50 148.5 HDTV 1080P

14 1920*1080 67.432 59.94 148.350 HDTV 1080P

15 1920*1080 67.5 60.00 148.5 HDTV 1080P

6. HDMI input

(PC-Spec. out but it can be shown the picture at only HDMI/DVI IN 1 via DVI to HDMI Cable)

No Resolution H-freq. (kHz) V-freq. (Hz) Pixel clock (MHz) Proposed

1 640×480 31.469 59.94 25.17 VESA(VGA)

2 800×600 37.879 60.317 40.00 VESA(SVGA)

3 1024×768 48.363 60.004 65.00 VESA(XGA)

4 1280×768 47.776 59.87 79.5 VESA(WXGA)

5 1360×768 47.72 59.799 84.62 VESA(WXGA)

6 1366×768 47.7 60.00 84.62 WXGA

7 1280×1024 63.595 60.00 108.875 SXGA

8 1920×1080 66.647 59.988 138.625 WUXGA

- 8 -

Only for training and service purposes

7. HDMI input (DTV)

No. Resolution H-freq. (kHz) V-freq. (Hz) Pixel clock(MHz) Proposed Remarks

1 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)

Spec. out but display.2 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)

3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz

4 720*480 31.469 59.94 27 SDTV 480P

5 720*480 31.5 60.00 27.027 SDTV 480P

6 720*576 31.25 50.00 27 SDTV 576P

7 1280*720 44.96 59.94 74.176 HDTV 720P

8 1280*720 45 60.00 74.25 HDTV 720P

9 1280*720 37.5 50.00 74.25 HDTV 720P

10 1920*1080 28.125 50.00 74.25 HDTV 1080I

11 1920*1080 33.72 59.94 74.176 HDTV 1080I

12 1920*1080 33.75 60.00 74.25 HDTV 1080I

13 1920*1080 56.25 50.00 148.5 HDTV 1080P

14 1920*1080 67.43 59.94 148.350 HDTV 1080P

15 1920*1080 67.5 60.00 148.5 HDTV 1080P

16 1920*1080 27 24.00 74.25 HDTV 1080P

17 1920*1080 33.75 30.00 74.25 HDTV 1080P

18 1920*1080 26.97 23.97 74.25 HDTV 1080P

19 1920*1080 33.716 29.976 74.25 HDTV 1080P

- 9 -

Only for training and service purposes

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to all of the LED TV with

LB45B chassis.

2. Designation

(1) Because this is not a hot chassis, it is not necessary to

use an isolation transformer. However, the use of isolation

transformer will help protect test instrument.

(2) Adjustment must be done in the correct order.

(3) The adjustment must be performed in the circumstance of

25 °C ± 5 °C of temperature and 65 % ± 10 % of relative

humidity if there is no specific designation.

(4) The input voltage of the receiver must keep 100-220 V,

50/60Hz.

(5)

The receiver must be operated for over 5 minutes prior to

the adjustment when module is in the circumstance of

above 15 °C.

In case of keeping module is in the circumstance of 0 °C, it

should be placed in the circumstance of above 15 °C for 2

hours.

In case of keeping module is in the circumstance of below

-20 °C, it should be placed in the circumstance of above 15

°C for 3 hours.

* Caution

When a still image is displayed for 20 minutes or longer

(especially where W/B scale is strong. Digital pattern 13ch

an d/ or Cr os s h at ch pa tt ern 0 9ch), there can s ome

afterimage in the black level area.

3. ADC Calibration

- An ADC calibration is automatically adjusted from DFT-Jig

- If it needs to adjust manually, refer to appendix.

* ADC Calibration Protocol (RS232)

Adjust Sequence

▪aa 00 00 [Enter Adjust Mode]

▪xb 00 40 [Component1 Input (480i)]

▪ad 00 10 [Adjust 480i Comp1]

▪xb 00 60 [RGB Input (1024*768)]

▪ad 00 10 [Adjust 1024*768 RGB]

▪aa 00 90 End Adjust mode

4. EDID Download

4.1. Overview

- It is a VESA regulation. A PC or a MNT will display an

optimal resolution through information sharing without any

necessity of user input. It is a realization of “Plug and Play”.

4.2. Equipment

- Since EDID data is embedded, EDID download JIG, HDMI

cable are not need.

4.3. Download method

- The EDID data is automatically saved.

■ 8BIT FHD Large Inch 42LB5**A Models(LB45B)

ⓐ Checksum: Changeable b y total EDID data.

<Large FHD Model> LB45B- 42LB5xx

NO Item CMD 1 CMD 2 Data 0

Enter Adjust

MODE

Adjust

‘Mode In’

A A 0 0

When transfer the ‘Mode In’,

Carry the command.

ADC adjust

ADC

Adjust

A D 1 0

Automatically adjustment

(The use of a internal pattern)

EZ ADJUST

0. Tool Option1

1. Tool Option2

2. Area Option

3. ADC Calibration

9. W/V ADJUST

5. EDID D/L(AC3) ►

EDID D/L

HDMI1 NG

HDMI2 NG

Start

Reset

EDID D/L

HDMI1 OK

HDMI2 OK

Start

Reset

** HDMI 1 : 256Bytes

0 1 2 3 4 5 6 7 8 9 A B C D E F

0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01

10 01 18 01 03 80 A0 5A 78 0A D9 B0 A3 57 49 9C 25

20 11 49 4B 21 08 00 01 01 45 40 61 40 01 01 81 80

30 01 01 D1 C0 01 01 02 3A 80 18 71 38 2D 40 58 2C

40 45 00 08 44 21 00 00 1E 1B 21 50 A0 51 00 1E 30

50 48 88 35 00 BC 88 21 00 00 1C 00 00 00 FC 00 4C

60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD

70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01

ⓐ

80 02 03 28 F1 4F 90 07 01 16 02 03 11 12 13 04 14

90 05 20 22 1F 26 11 07 50 09 7F 07 83 01 00 00 68

A0 03 0C 00 10 00 80 1E 00 01 1D 00 80 51 D0 1C 20

B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0

C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14

D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D

E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E

F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

ⓐ

EDID C/S data

FHD (8Bit)

HDMI

check sum (Hex)

Block 0 C0

Block 1

44 (HDMI1)

34 (HDMI2)

- 10 -

Only for training and service purposes

5. White Balance Adjustment

5.1. Overview

5.1.1. W/B adj. Objective & How-it-works

(1) Objective: To reduce each Panel’s W/B deviation

(2) How-it-works: When R/G/B gain in the OSD is at 192, it

means the panel is at its Full Dynamic Range. In order to

prevent saturation of Full Dynamic range and data, one of

R/G/B is fixed at 192, and the other two is lowered to find

the desired value.

(3) Adj. condition: normal temperature

1) Surrounding Temperature: 25 °C ± 5 °C

2) Warm-up time: About 5 Min◦

3) Surrounding Humidity: 20% ~ 80%

4) Befor e White balance adjustment, Keep po wer on

status, don’t power off.

5.1.2. Adj. condition and cautionary items

(1) Lighting condition in surrounding area surrounding lighting

should be lower 10 lux.

Try to isolate adj. area into dark surrounding.

(2) Probe location: Color Analyzer(CA-210) probe should be

within 10 cm and perpendicular of the module surface

(80°~ 100°)

(3) Aging time

1) After Aging Start, Keep the Power ON status during 5

Minutes.

2) In case of LCD, Back-light on should be checked using

no signal or Full-white pattern.

5.2. Equipment

(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:

CH14)

(2) Adj. Computer(During auto adj., RS-232C protocol is needed)

(3) Adjust Remote control

(4) Video Signal Generator MSPG-925F 720p/204-Gray

(Model: 217, Pattern: 49)

* Color Analyzer Matrix should be calibrated using CS-1000.

5.3. Equipment connection

** RS-232C Connection Method.

LB45S/LB45R → RGB cable → UART Jig → RS232C cable

and USB AM-BM cable → PC(RS232C Port)

5.4. Adjustment Command (Protocol)

(1) RS-232C Command used during auto-adj.

(2) Adjustment Map

5.5. Adjustment method

5.5.1. Auto WB calibration

(1) Set TV in ADJ mode using P-Only key(or POWER ON key).

(2) Place optical probe on the center of the display.

- It need to check probe condition of zero calibration before

adjustment.

(3) Connect RS-232C Cable

(4) Select mode in ADJ Program and begin a adjustment.

(5) When WB adjustment is completed with OK message, check

adjustment status of pre-set mode.(Cool, Medium, Warm)

(6) Remove probe and RS-232C cable.

▪ W/B Adj. must begin as start command “wb 00 00” , and

finish as end command “wb 00 ff”, and Adj. offset if need.

5.5.2. LED White balance table

- If Model is Polaris Model, G-gain fix is applied.

(1) Cool Mode

1) Purpose : Especially G-gain fix adjust leads to the

luminance enhancement. Adjust the color temperature

to reduce the deviation of the module color temperature.

2) Principle: To adjust the white balance without the saturation,

- Adjust the G gain more than 172 (If R gain or G gain is

more than 255, G gain can adjust less than 172) and

change the others(R/B Gain).(20LB45X model)

- Fix the G gain to 172(default data) and change the

others(R/B Gain).(over 22inch model)

3) Adjustment mode : mode - Cool

Co lor Anal yze r

Co mp ute r

Pattern Gen era to r

RS -232 C

RS- 232 C

Pro be

Sig nal Sou rce

* If TV internal pattern is used, not needed

RS-232C COMMAND

Explanation

CMD DATA ID

wb 00 00 Begin White Balance adjustment

wb 00 ff

End White Balance adjustment

(internal pattern disappears)

Adj. item

Command

(lower caseASCII)

Data Range

(Hex.)

Default

(Decimal)

CMD1 CMD2 MIN MAX

Cool

R Gain j g 00 C0 172

G Gain j h 00 C0 192

B Gain j i 00 C0 192

R Cut 64

G Cut 64

B Cut 64

Medium

R Gain j a 00 C0 192

G Gain j b 00 C0 192

B Gain j c 00 C0 192

R Cut 64

G Cut 64

B Cut 64

Warm

R Gain j d 00 C0 192

G Gain j e 00 C0 192

B Gain j f 00 C0 192

R Cut 64

G Cut 64

B Cut 64

- 11 -

Only for training and service purposes

(2) Medium / Warm Mode

1) Purpose : Adjust the color temperature to reduce the

deviation of the module color temperature.

2) Principle: To adjust the white balance without the saturation,

- In Medium mode, Fix to G gain to 192 and change the

others(R/B Gain)(20LB45X model)

- Fix the one of R/G/B gain to 192(default data) and

decrease the others.

3) Adjustment mode : Two modes - Medium / Warm

5.6. Reference(White Balance Adjustment

coordinate and color temperature)

(1) Luminance: 204 Gray, 80IRE

(2) Standard color coordinate and temperature using CS-1000

(over 26 inch)

■ The spec of color temperatre and coordinate.

* Note : x,y coordinates are drifted about 0.007 after 30 mins

heat-run. So checking color coordinate within 5-min at

total assembly line, consider x,y coordinates might be

up to 0.007 than x,y target of each color temperature.

● W/B Table in process of aging time

- LGD Module

- AUO/ INX/ COST/ SHARP/ BOE Module which cool spec is

13000K

6. Tool Option setting & Inspection per

countries

(1) Press 'IN START' key at Factory Service remote control.

(2) Select 'Tool Option 1'.

(3) Punch in the number and press 'OK'. (Each of models has

their number)

(4) Correct 'Tool Option2' ~ 'Tool Option5'.

(5) Completed adjusting Tool option.

7. Ship-out mode check (In-stop)

▪ After final inspection, press In-Stop key of the Adjustemnt

Remote Control and check that the unit goes to Stand-by mode.

8. AUDIO output check

8.1. Audio input condition

(1) RF input: Mono, 1 KHz sine wave signal, 100% Modulation

(2) CVBS, Component: 1 KHz sine wave signal (0.4 Vrms)

8.2. Specification

9. GND and HI-POT Test

9.1. GND & HI-POT auto-check preparation

(1) Check the POWER CABLE and SIGNAL CABE insertion

condition

9.2. GND & HI-POT auto-check

(1) Pallet moves in the station. (POWER CORD / AV CORD is

tightly inserted)

(2) Connect the AV JACK Tester.

(3) Controller (GWS103-4) on.

(4) GND Test (Auto)

- If Test is failed, Buzzer operates.

- If Test is passed, execute next process (Hi-pot test).

(Remove A/V CORD from A/V JACK BOX)

(5) HI-POT test (Auto)

- If Test is failed, Buzzer operates.

- If Test is passed, GOOD Lamp on and move to next

process automatically.

Mode Color Temp Color coordinate Remark

Cool

(C50)

13,000 K

x = 0.271 (±0.015)

y = 0.270 (±0.015)

* Test signal

- Inner pattern for

W/B adjust

- External white

pattern (80IRE,

204gray)

Medium

(0)

9,300 K

x = 0.286 (±0.015)

y = 0.289 (±0.015)

Warm

(W50)

6,500 K

x = 0.313 (±0.015)

y = 0.329 (±0.015)

Item Min Typ Max Unit Remark

Audio practical max

Output, L/R (Distortion

=10% max Output)

4.5 5.0 6.0

Vrms

(1) Measurement condition

- EQ/AVL/Clear Voice: Off

(2) Speaker (8 Ω Impedance)

(normal line) March ~ December

Aging time Cool Medium Warm

color coordinate x y x y x y

Target 271 270 286 289 313 329

1 0-2 282 289 297 308 324 348

2 3-5 281 287 296 306 323 346

3 6-9 279 284 294 303 321 343

4 10-19 277 280 292 299 319 339

5 20-35 275 277 290 296 317 336

6 36-49 274 274 289 293 316 333

7 50-79 273 272 288 291 315 331

8 80-119 272 271 287 290 314 330

9 Over 120 271 270 286 289 313 329

(normal line) January ~ Feburary

Aging time Cool Medium Warm

color coordinate x y x y x y

Target 271 270 286 289 313 329

1 0-2 286 295 301 314 328 354

2 3-5 284 290 299 309 326 349

3 6-9 282 287 297 306 324 346

4 10-19 279 283 294 302 321 342

5 20-35 276 278 291 297 318 337

6 36-49 274 275 289 294 316 334

7 50-79 273 272 288 291 315 331

8 80-119 272 271 287 290 314 330

9 Over 120 271 270 286 289 313 329

cool med Warm

x y x y x Y

spec 271 270 286 289 313 329

target 278 280 293 299 320 339

- 12 -

Only for training and service purposes

9.3. Checkpoint

(1) Test voltage

- GND: 1.5 KV / min at 100 mA

- SIGNAL: 3 KV / min at 100 mA

(2) TEST time: 1 second

(3) TEST POINT

- GND Test = POWER CORD GND and SIGNAL CABLE

GND.

- Hi-pot Tes t = POWER CORD GND a nd LIVE &

NEUTRAL.

(4) LEAKAGE CURRENT: At 0.5 mArms

10. USB S/W Download

(optional, Service only)

* Warning : Do not Download on Power only mode

(1) Put the USB Stick to the USB socket.

(2) Automatically detecting update file in USB Stick.

- If your downloaded program version in USB Stick is lower

than that of TV set, it didn’t work.

Otherwise USB data is automatically detected.

(3) Show the message “Copying files from memory”.

(4) Updating is starting.

(5) Updating Completed, the TV will restart automatically.

(6) If your TV is turned on, check your updated version and

Tool option. (explain the Tool option, next stage)

* If downloading version is more high than your TV have,

TV can lost all channel data. In this case, you have to

channel recover. if all channel data is cleared, you didn't

have a DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.

1) Push "IN-START" key in service remote control.

2) Select "Tool Option 1" and push "OK" key.

3) Punch in the number. (Each model has their number.)

11. Optional adjustments

11.1. Manual ADC Calibration

■ Enter ‘EZ ADJUST’ mode by pressing ‘ADJ’ key.

■ Enter Internal ADC calibration mode by pressing ‘OK’ key at

‘3. ADC CALIBRATION’

* Caution: Using ‘P-ONLY’ button of the Factory SVC remote

control when turns TV on.

● If you can’t success ADJUST ADC, please confirm ‘Support

Int. ADC’ at TOOL OPTION2.

11.2. Manual White balance Adjustment

11.2.1. Adj. condition and cautionary items

(1) Lighting condition in surrounding area surrounding lighting

should be lower 10 lux. Try to isolate adj. area into dark

surrounding.

(2) Probe location: Color Analyzer (CA-210) probe should be

within 10cm and perpendicular of the module surface.

(80°~ 100°)

(3) Aging time

1) After Aging Start, Keep the Power ON status during 5

Minutes.

2) In case of LCD, Back-light on should be checked using

no signal or Full-white pattern.

11.2.2. Equipment

(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:

CH14)

(2) Adj. Computer(During auto adj., RS-232C protocol is needed)

(3) Adjust Remot control

(4) Video Signal Generator MSPG-925F 720p/216-Gray

(Model: 217, Pattern: 78)

11.2.3. Adjustment

(1) Set TV in Adj. mode using POWER ON.

(2) Zero Calibrate the probe of Color Analyzer, then place it on

the center of LCD module within 10cm of the surface.

(3) Press ADJ key → EZ adjust using adj. R/C → 6. White-

Balance then press the cursor to the right (Key►). When

Key(►) is pressed 216 Gray interna l pattern will be

displayed.

(4) One of R Gain / G Gain / B Gain should be fixed at 192,

and the rest will be lowered to meet the desired value.

(5) Adj. is performed in COOL, MEDIUM, WARM 3 modes of

color temperature.

■ If internal pattern is not available, use RF input. In EZ Adj.

menu 6.White Balance, you can select one of 2 Test-pattern:

ON, OFF. Default is inner(ON). By selecting OFF, you can

adjust using RF signal in 216 Gray pattern.



- 13 -

Only for training and service purposes

POWER BOARD

Sound AMP

NTP7513

IC301

(

Module

JK101

Y,Pb,Pr In

Audio

Out

MST6841XP

Tuner SDA

Tuner SCL

TUNER

IF_AGC

B+

IR/KEY

24Mhz

IC50 2

Serial Flash

8Mbytes

IC50 3

EEPROM

24C64

IC501

LPF

P30 1

AV2 In

OP-AMP

IC302

x4 Gain

P70 1

P60 1/602

Audio L-Out

2 4 1

XXX

37 38

Audio R-Out

HDMI

SCL/SDA

115

51 113 112

Audio_SCL

Audio_SDA

LVDS

Output

P Dim

Inv. ON

RL On

P_ST 3.5V

M_3.3V

TU_3.3V

P_24V

IC701

MP20051

Main_1.2V

A_OUT_12V

10 11

I2S_MCLK

I2S_WS

I2S_SCK

I2S_SDO

P40 0

108

111

117

KEY1

Led_PWR

102 105 101

EEP SDA

EEP SCL

SPI_CLK

SPI_DI

SPI_CZ

SPI_DO

S_AMP_24V

LPF

JK202

USB_5V

110

KEY2

ST_3.5V

P_12V

Q71 0

IC711

1.8V REG

Main_1.8V

Main_3.3V

Q72 0

AO3407A

Panel_Vcc

IC709

MP1497

Main_5V

To USB

USB_DN

USB_DP

IF_P

IF_N

13~1 5

JK203

JK204

IC401

To USB

TU_1.8V

Comp. R/L In

AV1 In

26,33,34 27,35,3622,20,24,33,34

116

107

100

XXX

IR Board

BLOCK DIAGRAM

- 14 -

Only for training and service purposes

900

200

400

410

420

540

521

530

820

501

500

120

502

121

LV1

A10

Set + Stand

EXPLODED VIEW

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 essenti al that these special safet y parts shoul d be replac ed with the same compo nents 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

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.

FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS

ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR

THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

INPUT1

MNTROUT

MNTLOUT

COMMONRIN

COMMONLIN

AV2RIN

AV2LIN

COMP_PR

COMP_PB

COMMON_VIN

AV2_VIN

R105

10K

C103

5600pF

50V

R109

12K

TP101

R107

220K

COMMON_RIN

MUTE_AOUT

R106

12K

MUTE_AOUT

R103

R108

10K

R104

220K

COMP_PR

MNT_ROUT

C105

5600pF

50V

MNT_LOUT

R110

COMMON_LIN

COMP_PB

COMMON_VIN

P_12V

MNT_VOUT

R102

R111

R123

220

DEBUG

R120

DEBUG

AV2_RIN

R116

220K

R114

10K

R117

10K

R118

12K

R113

220K

R115

12K

AV2_LIN

AV2_VIN

C106

10uF

16V

C104

10uF

16V

Q101

MMBT3904(NXP)

Q102

MMBT3904(NXP)

READY

Q103

MMBT3904(NXP)

Q104

MMBT3904(NXP)

READY

Q105

MMBT3904(NXP)

DEBUG

AV2_VIN

R122

OPT

R121

DEBUG

C101

470pF

50V

C102

470pF

50V

C107

470pF

50V

C108

470pF

50V

JK101

PPJ239-06

ZD110

20V

ZD10 7

20V

ZD109

20V

ZD105

20V

ZD104

20V

ZD10 6

20V

ZD108

SD05

READY

ZD100

SD05

READY

ZD102

SD05

READY

ZD101

SD05

READY

D102

D101

D104

D103

D105

D106

D107

D108

JK101-*1

PPJ239-26

GREEN & YELLOW

[YL/GL]O-SPRING

[YL/GL]E-LUG

[YL/GL]CONTACT

[BL]E-LUG-S

[BL]O-SPRING

[RD1]E-LUG-S

[RD1]O-SPRING

[WH1]O-SPRING

[RD2]CONTACT

[RD2]O-SPRING

[RD2]E-LUG

[WH2]E-LUG

[WH2]O-SPRING

[RD3]E-LUG-S

[RD3]O-SPRING

[YL]E-LUG-S

[YL]O-SPRING

[YL]CONTACT

[WH3]O-SPRING

[RD4]CONTACT

[RD4]O-SPRING

[RD4]E-LUG

R101

R150

READY

R151

READY

R112

1 7

INPUT1

COMPONENT / AV IN / AV AUDIO OUT

LB45B/LT5B

EAX65550501

POP NOISE

V-OUT Buffer(DEBUG)

32/42LB550A

2013/08/15

Size check!!

Only for training and service purposes

LGE Internal Use Only

USB DOWN STR EAM

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.

FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS

ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR

THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

INPUT2

GND

+5V_USB

ZD221

30V

READY

ZD220

30V

READY

USB_DP

USB_DN

C220

10uF

10V

OPT

C221

22uF

10V

R204

W/O UART IC

C203

0.1uF

With UART IC

IC201

MAX3232CDR

EAN41348201

With UART IC

C1-

V+

C2+

C1+

V-

C2-

DOUT2

RIN2

ROUT2

DIN2

DIN1

ROUT1

RIN1

DOUT1

GND

VCC

R205

W/O UART IC

JK201

KJA-PH-1-0177

3 M3_DETECT

4 M4

5 M5_GND

1 M1

6 M6

C205

0.1uF

With UART IC

C202

0.1uF

With UART IC

R202

100

With UART IC

DSUB_SCL

C201

0.1uF

P201

12505WS-04A00

DEBUG

P202

12507WS-04L

VCC

PM_RXD

GND

RM_TXD

GND

DSUB_SDA

R201

100

With UART IC

C204

0.1uF

With UART IC

HDMI1_D0-

JK203

CEC

DATA1_SHIELD

SHIELD

CLK-

CLK_SHIELD

DATA2_SHIELD

HPD

+5V_POWER

CLK+

DATA1+

DATA2+

DDC/CEC_GND

DATA0-

DATA0_SHIELD

DATA2-

SDA

DATA0+

DATA1-

SCL

HDMI1_SCL

Q230

MMBT3904(NXP)

R230

10K

HDMI1_CK+

R233

2.7K

+5V_USB

R232

2.7K

HDMI1_D1-

HDMI1_D2+

HDMI1_D0+

HDMI1_CK-

HDMI1_SDA

HDMI1_D2-

HDMI1_HPD

R231

HDMI1_D1+

HDMI2_CK+

HDMI2_HPD

HDMI2_SCL

+5V_USB

HDMI2_D1-

HDMI2_CK-

Q240

MMBT3904(NXP)

R242

R241

10K

HDMI2_D0-

HDMI2_D2-

HDMI2_D1+

JK204

CEC

DATA1_SHIELD

SHIELD

CLK-

CLK_SHIELD

DATA2_SHIELD

HPD

+5V_POWER

CLK+

DATA1+

DATA2+

DDC/CEC_GND

DATA0-

DATA0_SHIELD

DATA2-

SDA

DATA0+

DATA1-

SCL

HDMI2_SDA

R243

2.7K

R244

2.7K

HDMI2_D2+

HDMI2_D0+

ZD230

READY

ZD231

READY

ZD232

READY

ZD233

READY

R236

100

R237

100

ZD240

READY

ZD241

READY

ZD242

READY

ZD243

READY

R247

100

R248

100

L220

120OHM

JK202

3AU04S-305-ZC-(LG)

1234

+3.5V_ST

R206

100

W/O UART IC

HDMI2_DET

+3.5V_ST

D242

30V

READY

R246

10K

R245

10K

D241

30V

READY

+3.5V_ST

HDMI1_DET

D234

IP4283CZ10-TBA

ESD_HDMI2_IP4283

GND_1

TMDS_CH1+

TMDS_CH2-

TMDS_CH1-

TMDS_CH2+

NC_1

NC_2

GND_2

NC_3

NC_4

D235

IP4283CZ10-TBA

ESD_HDMI2_IP4283

GND_1

TMDS_CH1+

TMDS_CH2-

TMDS_CH1-

TMDS_CH2+

NC_1

NC_2

GND_2

NC_3

NC_4

D244

IP4283CZ10-TBA

ESD_HDMI2_IP4283

GND_1

TMDS_CH1+

TMDS_CH2-

TMDS_CH1-

TMDS_CH2+

NC_1

NC_2

GND_2

NC_3

NC_4

D245

IP4283CZ10-TBA

ESD_HDMI2_IP4283

GND_1

TMDS_CH1+

TMDS_CH2-

TMDS_CH1-

TMDS_CH2+

NC_1

NC_2

GND_2

NC_3

NC_4

D234-*1

IP4294CZ10-TBR

ESD_HDMI_IP4294

D235-*1

IP4294CZ10-TBR

ESD_HDMI_IP4294

D244-*1

IP4294CZ10-TBR

ESD_HDMI_IP4294

D245-*1

IP4294CZ10-TBR

ESD_HDMI_IP4294

2 7

INPUT2

Close to SIDE_USB

USB(SIDE)

I2C Control

HDMI(REAR)

EAX65550501

32/42LB550A

2013/08/15

LB45B/LT5B

Only for training and service purposes

LGE Internal Use Only

THERMAL

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.

FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS

ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR

THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

AUDIO

R357

6.8K

MNT_ROUT

Q351

MMBT3904(NXP)

R353

6.8K

R358

C356

6800pF

50V

P_12V

MNT_R_AMP

MNT_L_AMP

R356

10K

C352 33pF 50V

IC302

AS324MTR-E1

3 INPUT1+

2 INPUT1-

4 VCC

1 OUT1

6 INPUT2-

5 INPUT2+

7 OUT2 8OUT3

9INPUT3-

10INPUT3+

11GND

12INPUT4+

13INPUT4-

14OUT4

R354 5.6K

Q350

MMBT3904(NXP)

P_12V

C351

6800pF

50V

R35 9

4.7 K

P_12V

R350

4.7K

C350

0.1uF

16V

C354

33pF

50V

MNT_LOUT

C355

0.1uF

16V

R352

10K

R355

5.6K

SPK_L+

SPK_R-

JP302

JP301

SPK_L-

JP304

SPK_R+

P301

SMAW250-H04R

JP303

SPK_R+

SPK_L-

C329

0.47uF

50V

0.1uF

C334

50V

0.1uF

C331

50V

C333

0.47uF

50V

SPK_R-

0.1uF

C330

50V

SPK_L+

0.1uF

C335

50V

R351 1K

C353

0.1uF

16V

R316

C306

33pF

50V

R307 100

C319

22000pF

50V

I2S_SCK

C315

22000pF

50V

C326

390pF

50V

R317

R314

R315

C31 2

1uF

10V

C302

0.1uF

16V

OPT

1uF

C303

10V

SW_RESET

AUAMP_SDA

0.1uF

C309

50V

0.1uF

C318

50V

+24V_AMP

C327

390pF

50V

I2S_WS

R306 100

C325

390pF

50V

C305

33pF

50V

R320

C301

0.1uF

16V

R318

C311

22000pF

50V

R311

100

READY

C314

1uF

10V

C308

22000pF

50V

R319

+24V_AMP

I2S_SDO

C328

390pF

50V

R313

I2S_MCLK

AUAMP_SCL

C320

1000pF

50V

R308

4.7K

R309

4.7K

+3.3V_M

0.1uF

C322

16V

R301 100

R302 100

R303 100

L301

BLM18PG121SN1D

+3.3V_M

R304 100

C321

10uF

6.3V

L304

10uH

ABCO

L305

10uH

ABCO

L303

10uH

ABCO

L306

10uH

ABCO

POWER_DET

C317

10uF

35V

C310

10uF

35V

L303-*1

10.0uH

TAIYO YUDEN

L304-*1

10.0uH

TAIYO YUDEN

L305-*1

10.0uH

TAIYO YUDEN

L306-*1

10.0uH

TAIYO YUDEN

R324

4.7K

R323

4.7K

R322

4.7K

R325

4.7K

IC301

NTP7514

NC_2

VDD_PLL

GND

NC_1

DVDD

NC_3

SDATA

WCK

BCK

SDA

SCL

FAULT

MONITOR_0

MONITOR_1

MONITOR_2

BST2B

PGND2B

OUT2B

PVDD2B

PVDD2A

OUT2A

PGND2A

BST2A

VDR2

AGND

NC_4

VDR1

BST1B

PGND1B

OUT1B

PVDD1B

PVDD1A

OUT1A

PGND1A

BST1A

RESET

CLK_I

GND_IO

VDD_IO

[EP]GND

AUDIO

3 7

AUDIO_OUT AMP : GAIN X 4

SPK_R+

SPK_L-

SPK_L+

SPK_R-

SPEAKER_R

SPEAKER_L

0x54

EAX65550501

32/42LB550A

2013/08/15

LB45B/LT5B

Only for training and service purposes

LGE Internal Use Only

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.

FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS

ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR

THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

TUNER & IR

IF_N

C402

47pF

50V

C403

47pF

50V

IF_P

C410

0.1uF

16V

IF_AGC

R412

100

+3.3V_M

C405

0.1uF

16V

C411

0.1uF

16V

+3.3V_TU

L421

BLM18PG121SN1D

+3.5V_ST

C423

0.1uF

16V

KEY1

KEY2

C425

0.1uF

16V

OPT

C422

0.1uF

OPT

C421

0.1uF

OPT

C426

100pF

50V

+3.5V_ST

C424

1000pF

50V

LED

C404

22uF

6.3V

100pF

C406

50V

TUNER_SCL

TUNER_SDA

L401

BLM18PG121SN1D

R421

10K

R422

10K

R407

2.2K

R408

2.2K

R405

R406

C412

10uF

6.3V

R413

PAL

R414

PAL

R413-*1

NTSC

R414-*1

NTSC

ZD401

SD05

ZD402

SD05

R423

3.3K

OPT

TU401

TDJH-G101D

PAL

SHIELD

IF[P]

IF[N]

NC_2

NC_3

B1[+3.3V]

NC_1

IF_AGC

SCL

SDA

P421

12507WR-10L

ZD404

IR_Zener

ZD403

LED_R_Zener

TDJH-H101F

TU403

NTSC

SHIELD

IF[P]

IF[N]

NC_2

NC_3

B1[+3.3V]

NC_1

IF_AGC

SCL

SDA

TUNER & IR

4 8

close to the tuner pin.

IR/LED+Control

should be guarded by ground

Close to the tuner

EAX65550501

32/42LB550A

2013/08/15

LB45B/LT5B

Only for training and service purposes

LGE Internal Use Only

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