LG 43LF513A, 49LF513A-TA Schematic

Internal Use Only

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LED TV

SERVICE MANUAL

CHASSIS : LB56A

MODEL : 43/49LF513A 43/49LF513A-TA

CAUTION

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

Printed in KoreaP/NO : MFL68743606 (1507-REV00)

CONTENTS

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

SAFETY PRECAUTIONS

SERVICING PRECAUTIONS

SPECIFICATION

....................................................................................... 6

ADJUSTMENT INSTRUCTION

DISASSEMBLY

BLOCK DIAGRAM

EXPLODED VIEW

...................................................................................... 13

.................................................................................. 14

.................................................................................. 15

........................................................................ 3

.................................................................... 4

................................................................ 9

SCHEMATIC CIRCUIT DIAGRAM

TROUBLE SHOOTING GUIDE

................................................ APPENDIX

........................................... APPENDIX

Only for training and service purposes

- 2 -

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent 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 the circuitry 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 exposed metallic part. 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

Only for training and service purposes

- 3 -

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 precautions. 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 explosion 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 easily 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 damage 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. Alternatively, obtain and wear a commercially available discharging 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 exposure 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 electrically 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 material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement 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 appropriate 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 wirebristle (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 component 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.

Only for training and service purposes

- 4 -

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent at against the circuit 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 remaining 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 possible 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.

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 whenever 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 connections).

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 connected 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.

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.

Only for training and service purposes

- 5 -

SPECIFICATION

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

1. Application range

This specification is applied to the LB56A 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

each drawing and specification 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

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

3. Channel Storage

4. Receiving system Upper Heterodyne

5. Video Input PAL, SECAM, NTSC 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 Service Only Rear (1EA)

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

11. Audio Input AV&Component &PC 2EA

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

Cable S1-S47 1-71 S1-S47

PAL/SECAM B/G/D/K, PAL I, NTSC-M PALB/B

Only for training and service purposes

- 6 -

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

Only for training and service purposes

- 7 -

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

Only for training and service purposes

- 8 -

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to all of the LED TV with LB56A 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 and/or Cross hatch pattern 09ch), there can some 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)

NO Item CMD 1 CMD 2 Data 0

Enter Adjust MODE

ADC adjust

Adjust Sequence

▪aa 00 00 [Enter Adjust Mode] ▪xb 00 40 [Component1 Input (480i)] ▪ad 00 10 [Adjust 480i Comp1] ▪aa 00 90 End Adjust mode

Adjust ‘Mode In’

ADC Adjust

A A 0 0

A D 1 0

When transfer the ‘Mode In’, Carry the command.

Automatically adjustment (The use of a internal pattern)

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.

EZ ADJUST

0. Tool Option1

1. Tool Option2

2. Area Option

3. ADC Calibration

9. W/V ADJUST

5. EDID D/L(AC3) ►

■ 8bit FHD large inch

** 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 19 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

ⓐ Checksum: Changeable b y total EDID data.

EDID C/S data

check sum (Hex)

Block 0 BF

Block 1

EDID D/L

HDMI1 NG

HDMI2 NG

HDMI1 OK

HDMI2 OK

Start

EDID D/L

Start

FHD(8 bit)

44(HDMI1) 34(HDMI2)

Reset

HDMI

ⓐ

Only for training and service purposes

- 9 -

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) Before White balance adjustment, Keep power 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

Color Analyzer

Probe

RS- 232C

Pattern Generator

Signal Source

* If TV internal pattern is used, not needed

** RS-232C Connection Method.

LB56G/LB56H → RGB cable or 3P H/P cable → UART Jig → RS232C cable and USB AM-BM cable → PC

RS-232C

Computer

RS-232C

5.4. Adjustment Command (Protocol)

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

RS-232C COMMAND

CMD D ATA ID

wb 00 00 Begin White Balance adjustment

wb 00 ff

End White Balance adjustment (internal pattern disappears)

Explanation

(2) Adjustment Map

Adj. item

R Gain j g 00 C0 172 G Gain j h 00 C0 192

Cool

Medium

Warm

B Gain j i 00 C0 192 R Cut 64 G Cut 64 B Cut 64 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 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

Command

(lower caseASCII) CMD1 CMD2 MIN MAX

Data Range

(Hex.)

Default

(Decimal)

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

Only for training and service purposes

- 10 -

(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 for Auto W/B.

Model Mode Color Temp. Color coordinate Remark

32LF5XXA (BOE/CSOT)

32~49LF5XXA (LGD)

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

Cool

(C50)

Medium

Warm (W50)

13,000 K

9,300 K

(0)

6,500 K

Refer to below W/B table in process of

x = 0.278 (± 0.002) y = 0.280 (± 0.002)

x = 0.293 (± 0.002) y = 0.299 (± 0.002)

x = 0.320 (± 0.002) y = 0.339 (± 0.002)

aging time.

* Test signal

- Inner pattern for W/B adjust

- External white pattern (85IRE, 204gray)

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.

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

Item Min Typ Max Unit Remark

Audio practical max Output, L/R (Distortion =10% max Output)

4.5 5.0 6.0

(1) Measurement condition

- EQ/AVL/Clear Voice: Off

Vrms

(2) Speaker (8 Ω Impedance)

● W/B Table in process of aging time

- 32”~49” LGD Module(except 32/43LF51 LGD)

(normal line)

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

- AUO /INX/ COST / SHARP / BOE / 32/43LF51 LGD Module which cool spec is 13000K

cool med Warm

x y x y x Y

spec 271 270 286 289 313 329

target 278 280 293 299 320 339

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.

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 Test = POWER CORD GND and LIVE &

NEUTRAL.

(4) LEAKAGE CURRENT: At 0.5 mArms

Only for training and service purposes

- 11 -

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 older 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.

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 Service

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.

(5) Updating Completed, the TV will restart automatically. (6) If your TV is turned on, check your updated version and

Tool option.

* If downloading version is more new 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.)

Only for training and service purposes

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 internal 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.

- 12 -

■ Disassembly of Back cover

DISASSEMBLY

(1) Unscrew bolts in the set.

(2) Check both right and left hole.

(4) Put ‘long nose’ into the hole.

(5) Open B/C with push/pulling long

nose to upper and lower sides.

(3) Attach tape to ‘Long nose pliers’.

* Scratch can be caused without tape.

Only for training and service purposes

- 13 -

(6) Disassemble Back cover.

* Disassemble it from left to right for top

side hook on Back cover

BLOCK DIAGRAM

JK204

IF_N

IF_P

USB_5V

IF_AGC

Tuner SDA

Tuner SCL

USB_DP

USB_DN

IR Board

3.3V_ST

Led_PWR

108

KEY2

110

P450

KEY1

111

117

IR/KEY

24Mhz

TUNER

Audio R-Out

Audio L-Out

37 38

26,33,34 27,35,36 22,20,24,33,34

B+

TU_3.3V

Out

Panel_Vcc

Audio

IC301

x4 Gain

OP-AMP

AV2 In

AV1 In

Comp. R/L In

Y,Pb,Pr In

3.3V_M

JK101

P600/601

XXX

IC500

MST6841XP

Module

LVDS

Output

RL On

P Dim

12 1

P700

POWER BOARD

4,5,6

7,8

Inv. ON

Panel_Vcc

Q704

DMP2130L

102 105 101

SPI_CLK

SPI_DI

IC502

Serial Flash

3.3V_ST

D13.2V

A13.2V

100

107

To USB

BD9D321EFJ

116

3.3V_M

Q705

3.3V_ST

1.2V_VDDC

IC700

IC702

BD9D321EFJ

DMP2130L

BD9D321EFJ

SPI_CZ

SPI_DO

EEP SCL

EEP SDA

IC503

8Mbytes

EEPROM

+5V_USB

IC701

Main_1.8V

IC703

XXX

HDMI

51 113 112

115

I2S_WS

I2S_SCK

I2S_MCLK

7 8 9

1.8V REG

3.3V_M

SCL/SDA

I2S_SDO

NTP7514

Sound AMP

(

JK203

Audio_SCL

Audio_SDA

10 11

IC300

LPF

P301

(

Only for training and service purposes

- 14 -

400

EXPLODED VIEW

IMPORTANT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

900

901

LV1

200

540

800

500

120

121

A10

701

700

Set + Stand

Only for training and service purposes

- 15 -

EAX66783401

LGE Internal Use Only

LB56H/LT56H

COMPONENT / AV IN / AV AUDIO OUT

JK101

PPJ239-26

[RD4]E-LUG

[RD4]O-SPRING

AV2RIN

[RD4]CONTACT

[WH3]O-SPRING

AV2LIN

[YL]CONTACT

VA109 20V

VA108

20V

R108 220K

R107 220K

R115

10K

R114

10K

R119 12K

R118

12K

C107 470pF 50V

C106 470pF 50V

AV2_RIN

AV2_LIN

COMMONLIN

[YL]O-SPRING

[YL]E-LUG-S

[RD3]O-SPRING

[RD3]E-LUG-S

[WH2]O-SPRING

[WH2]E-LUG

[RD2]E-LUG

[RD2]O-SPRING

COMMONRIN

[RD2]CONTACT

[WH1]O-SPRING

[RD1]O-SPRING

[RD1]E-LUG-S

[BL]O-SPRING

COMP_PB

MNTROUT

MNTLOUT

COMP_PR

AV2_VIN

COMP_AV2_Zener_KEC

ZD106-*1

5.6V

COMP_AV2_Zener_KEC

VA10 0

COMP_AV2_Zener_KEC

ZD104-*1

5.6V

COMP_AV2_Zener_KEC

5.6V

ZD107-*1

20V

VA10 1

20V

5.6V

ZD105-*1

COMP_AV2_Zener_ROHM

C101 5600pF 50V

C100 5600pF 50V

COMP_AV2_Zener_ROHM

ZD107

COMP_AV2_Zener_ROHM

ZD106

R105

READY Q101

MMBT3904(NXP)

R112

READY Q100

MMBT3904(NXP)

R104

VA106

220K

20V

R103

VA105

220K

20V

ZD105

COMP_AV2_Zener_ROHM

ZD104

C E

R111

10K

R110

10K

VA104

SD05

READY

VA107

SD05

READY

Q103

MMBT3904(NXP)

C105

10uF

16V

C104

10uF

16V

Q102

MMBT3904(NXP)

R117 12K

R116

12K

POP NOISE

R102

POP NOISE

C103 470pF 50V

C102 470pF 50V

R113

75 3216 1/4W

Size check!!

MNT_ROUT

MUTE_AOUT

MNT_LOUT

MUTE_AOUT

COMMON_RIN

COMMON_LIN

AV2_VIN

COMP_PR

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

[BL]E-LUG-S

[YL/GN]CONTACT

[YL/GN]O-SPRING

[YL/GN]E-LUG

COMMON_VIN

COMP_AV2_Zener_KEC

ZD103-*1

ZD102-*1

5.6V

COMP_AV2_Zener_KEC

5.6V

ZD101-*1

ZD100-*1

5.6V

COMP_AV2_Zener_KEC

5.6V ZD103

COMP_AV2_Zener_ROHM

ZD102

COMP_AV2_Zener_ROHM

ZD101

COMP_AV2_Zener_ROHM

ZD100

COMP_AV2_Zener_ROHM

VA103

SD05

READY

R101

COMMON_VIN

COMP_PB

R109

VA102

SD05

75 3216

1/4W

Size check!!

V-OUT Buffer(DEBUG)

+12V

MMBT3904(NXP) Q104

AV2_VIN

OPT

R120

JP110

OPT

R121 75

OPT

R122

220

L15.5_ECI_M8RR 2015/03/03

COMP/AV

OPT

R123

OPT

MNT_VOUT

1 8

EAX66783401

LGE Internal Use Only

LB56H/LT56H

I2C Control

JK201

PEJ034-01

E_SPRING

R_SPRING

T_SPRING

B_TERMINAL2

T_TERMINAL2

DSUB_SCL

DSUB_SDA

AR201

100

1/16W

+3.3V_ST

R862 33

12507WS-04L

P201

ESD_HDMI_IP4294

HDMI(REAR)

AR204

5.1 1/16W

AR203

5.1 1/16W

Q201

MMBT3904(NXP)

R219 100

R220 100

R206

HDMI1_HPD

SHIELD

HPD

+5V_POWER

DDC/CEC_GND

SDA

SCL

CEC

CLK-

CLK_SHIELD

CLK+

DATA0-

DATA0_SHIELD

DATA0+

DATA1-

DATA1_SHIELD

DATA1+

DATA2-

DATA2_SHIELD

DATA2+

10K

JK203

This GND Pattern should be very narrow HDMI Jack burnt problem improvement

READY

VA202

R208 1K

TMDS_CH1-

TMDS_CH1+

GND_1

TMDS_CH2-

TMDS_CH2+

TMDS_CH1-

TMDS_CH1+

GND_1

TMDS_CH2-

TMDS_CH2+

D205

IP4283CZ10-TBA ESD_HDMI2_IP4283

D204

IP4283CZ10-TBA

ESD_HDMI2_IP4283

VA203 READY

NC_4

NC_3

GND_2

NC_2

NC_1

NC_4

NC_3

GND_2

NC_2

NC_1

D204-*1 IP4294CZ10-TBR

1 2 3 4 5

VA206

READY

ESD_HDMI_IP4294

10 9 8 7 6

+5V_USB

R215

R216

4.7K

D205-*1 IP4294CZ10-TBR

2 3

7 6

VA207

READY

HDMI1_CKHDMI1_CK+

HDMI1_D0HDMI1_D0+

HDMI1_D1HDMI1_D1+

HDMI1_D2HDMI1_D2+

HDMI1_SDA HDMI1_SCL

USB(REAR)

Close to SIDE_USB

USB_DN

USB_DP

OPT

C200 10uF 10V

C201 22uF 10V

JK204

US-04A-VSD

READY D200

30V

READY D201

30V

INPUT2

L200

120OHM

+5V_USB

L155_ECI_M8RR

INPUT

2015/03/03

2 8

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