LG 32LB515A-TH, 32LB55*A-T*, 32LB551C-TA, 42LB550A-TA, 42LB551C-TA Service manual & schematics

Internal Use Only

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

LED TV

SERVICE MANUAL

CHASSIS : LB45B

MODEL : 42LB550A 42LB550A-TA

42LB552A 42LB552A-TB

CAUTION

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

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

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 ..............................................................

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 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

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 solder 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 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

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

3. Channel Storage

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

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 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)

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] ▪xb 00 60 [RGB Input (1024*768)] ▪ad 00 10 [Adjust 1024*768 RGB] ▪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 42LB5**A Models(LB45B)

** 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

ⓐ Checksum: Changeable b y total EDID data.

<Large FHD Model> LB45B- 42LB5xx

EDID C/S data

check sum (Hex)

Block 0 C0

Block 1

EDID D/L

HDMI1 NG

HDMI2 NG

HDMI1 OK

HDMI2 OK

Start

EDID D/L

Start

FHD (8Bit)

HDMI

44 (HDMI1) 34 (HDMI2)

Reset

ⓐ

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) 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

Co lor Anal yze r

Pro be

RS -232 C

Pattern Gen era to r

Sig nal Sou rce

* If TV internal pattern is used, not needed

** RS-232C Connection Method.

LB45S/LB45R → RGB cable → UART Jig → RS232C cable and USB AM-BM cable → PC(RS232C Port)

RS- 232 C

Co mp ute r

RS- 232 C

.

5.4. Adjustment Command (Protocol)

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

RS-232C COMMAND

CMD DATA ID

wb 00 00 Begin White Balance adjustment

wb 00 ff

End White Balance adjustment (internal pattern disappears)

Explanation

(2) Adjustment Map

Cool

Medium

Warm

Adj. item

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 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.

Mode Color Temp Color coordinate Remark

Cool

(C50)

Medium

(0)

Warm (W50)

13,000 K

9,300 K

6,500 K

x = 0.271 (±0.015) y = 0.270 (±0.015)

x = 0.286 (±0.015) y = 0.289 (±0.015)

x = 0.313 (±0.015) y = 0.329 (±0.015)

* Test signal

- Inner pattern for W/B adjust

- External white pattern (80IRE, 204gray)

- AUO/ INX/ COST/ SHARP/ BOE 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

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.

* 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

(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

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

W

- EQ/AVL/Clear Voice: Off

Vrms

(2) Speaker (8 Ω Impedance)

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.

Only for training and service purposes

- 11 -

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.

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.

(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.)

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 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.

- 12 -

BLOCK DIAGRAM

JK202

IF_N

11

IF_P

10

USB_5V

IF_AGC

Tuner SDA

Tuner SCL

3

9

USB_DP

USB_DN

IR Board

ST_3.5V

Led_PWR

108

KEY2

P40 0

110

KEY1

111

IR

117

IR/KEY

98

99

44

24Mhz

43

40

39

4

52

53

45

B+

TUNER

Audio R-Out

Audio L-Out

37 38

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

7

5

IC401

To USB

TU_1.8V

M_3.3V

TU_3.3V

A_OUT_12V

Out

Audio

IC302

x4 Gain

OP-AMP

AV2 In

AV1 In

Comp. R/L In

Y,Pb,Pr In

JK101

Module

POWER BOARD

P60 1/602

2 4 1

P70 1

13~1 5

P_ST 3.5V

5

3

P_24V

10

9

LVDS

Panel_Vcc

Q72 0

XXX

Output

RL On

P Dim

Inv. ON

102 105 101

AO3407A

P_12V

IC501

MST6841XP

XXX

HDMI

100

54

18

SPI_CLK

SPI_DI

SPI_CZ

SPI_DO

EEP SCL

EEP SDA

94

97

95

96

85

84

To USB

24C64

IC50 2

IC50 3

8Mbytes

Serial Flash

EEPROM

Main_5V

IC709

MP1497

107

62

30

116 9

77

41

Main_1.2V

IC701

48

50

51 113 112

115

I2S_WS

I2S_MCLK

Main_1.8V

IC711

1.8V REG

Main_3.3V

Q71 0

MP20051

789

35

40

19

32

S_AMP_24V

JK203

SCL/SDA

I2S_SCK

I2S_SDO

Sound AMP

20

31

JK204

Audio_SCL

Audio_SDA

38

10 11

NTP7513

IC301

21

33

18

30

LPF

P30 1

(

Only for training and service purposes

- 13 -

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 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.

400

410

521

540

420

501

500

502

900

530

LV1

820

200

Only for training and service purposes

- 14 -

121

120

A10

A7

A2

Set + Stand

EAX65550501

LGE Internal Use Only

LB45B/LT5B

JK101-*1

PPJ239-26

[RD4]E-LUG

6H

[RD4]O-SPRING

5H

[RD4]CONTACT

4H

[WH3]O-SPRING

5G

[YL]CONTACT

4F

[YL]O-SPRING

5F

[YL]E-LUG-S

7F

[RD3]O-SPRING

5E

[RD3]E-LUG-S

7E

[WH2]O-SPRING

5D

[WH2]E-LUG

6D

[RD2]E-LUG

6N

[RD2]O-SPRING

5N

[RD2]CONTACT

4N

[WH1]O-SPRING

5M

[RD1]O-SPRING

5L

[RD1]E-LUG-S

7L

[BL]O-SPRING

5K

[BL]E-LUG-S

7K

[YL/GL]CONTACT

4J

[YL/GL]O-SPRING

5J

[YL/GL]E-LUG

6J

GREEN & YELLOW

JK101

PPJ239-06

COMPONENT / AV IN / AV AUDIO OUT

7H

6H

4H

5G

4F

6F

8F

5E

8E

5D

7D

7N

6N

4N

AV2RIN

AV2LIN

AV2_VIN

MNTROUT

MNTLOUT

COMMONRIN

D102

ZD10 7

20V

ZD10 6

20V

D101

C105 5600pF 50V

C103 5600pF 50V

ZD108

SD05

READY

ZD110 20V

ZD109

20V

C

B

E

READY Q104

MMBT3904(NXP)

C

B

E

READY Q102

MMBT3904(NXP)

ZD105 20V

R116 220K

R113 220K

R112

75

Size check!!

R111

1K

R110

1K

R107 220K

R114

10K

C E

R108

10K

R117

10K

R151 75

READY

Q103

MMBT3904(NXP)

B

C

B

E

R118 12K

R115

12K

C106

10uF

16V

C104

10uF

16V

Q101

MMBT3904(NXP)

R109 12K

C108 470pF 50V

C107 470pF 50V

MUTE_AOUT

POP NOISE

C102 470pF 50V

AV2_RIN

AV2_LIN

AV2_VIN

MNT_ROUT

MNT_LOUT

MUTE_AOUT

COMMON_RIN

5M

5L

COMMONLIN

COMP_PR

8L

5K

COMP_PB

8K

4J

6J

COMMON_VIN

7J

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

D104

D106

D108

D105

D103

D107

ZD102

SD05

READY

ZD101

SD05

READY

ZD100

SD05

READY

ZD104

20V

R104 220K

R103

R102

75

R101

75

R105

10K

R106

12K

C101 470pF 50V

COMMON_LIN

COMP_PR

75

COMP_PB

V-OUT Buffer(DEBUG)

R150 75

READY

Size check!!

COMMON_VIN

AV2_VIN

32/42LB550A

OPT

R122

0

INPUT1

TP101

DEBUG

R120 75

P_12V

C E

DEBUG

MMBT3904(NXP) Q105

B

DEBUG

R123

220

R121

33

DEBUG

MNT_VOUT

2013/08/15

1 7

EAX65550501

LGE Internal Use Only

LB45B/LT5B

I2C Control

KJA-PH-1-0177

JK201

6 M6

1 M1

3 M3_DETECT

4 M4

5 M5_GND

DEBUG

P201

12505WS-04A00

1

2

3

4

5

DSUB_SCL

USB(SIDE)

3AU04S-305-ZC-(LG)

JK202

1234

USB DOWN STR EAM

READY

ZD221

ZD220

30V

5

30V

R205

0

W/O UART IC

USB_DN

USB_DP

With UART IC

R204

0

W/O UART IC

DSUB_SDA

Close to SIDE_USB

OPT

C220 10uF 10V

R201 100

+3.5V_ST

C221 22uF 10V

W/O UART IC

R206

100

R202 100

With UART IC

PM_RXD

RM_TXD

L220

120OHM

0.1uF

VCC

GND

+3.5V_ST

C201

P202

12507WS-04L

1

2

3

4

5

GND

VCC

GND

DOUT1

RIN1

ROUT1

DIN1

DIN2

ROUT2

+5V_USB

With UART IC

IC201

MAX3232CDR

16

15

14

13

12

11

10

9

EAN41348201

HDMI(REAR)

R231 1K

+3.5V_ST

10K

R245

READY

ZD230

READY ZD231

GND

IP4283CZ10-TBA ESD_HDMI2_IP4283

TMDS_CH1-

1

TMDS_CH1+

2

GND_1

3

TMDS_CH2-

4

TMDS_CH2+

5

IP4283CZ10-TBA

ESD_HDMI2_IP4283

TMDS_CH1-

1

TMDS_CH1+

2

GND_1

3

TMDS_CH2-

4

TMDS_CH2+

5

R242 1K

D241

D234

NC_4

10

NC_3

9

GND_2

8

NC_2

7

NC_1

6

D235

NC_4

10

NC_3

9

GND_2

8

NC_2

7

NC_1

6

HDMI1_DET

30V

READY

+5V_USB

R232

2.7K

READY ZD232

R233

2.7K

R236 100

R237 100

READY ZD233

HDMI1_CKHDMI1_CK+

HDMI1_D0HDMI1_D0+

HDMI1_D1HDMI1_D1+

HDMI1_D2HDMI1_D2+

HDMI1_SDA HDMI1_SCL

+3.5V_ST

10K

READY ZD240

READY ZD241

TMDS_CH1-

TMDS_CH1+

TMDS_CH2-

TMDS_CH2+

TMDS_CH1-

TMDS_CH1+

TMDS_CH2-

TMDS_CH2+

GND_1

D242

D244

IP4283CZ10-TBA

ESD_HDMI2_IP4283

1

2

3

4

5

D245

IP4283CZ10-TBA

ESD_HDMI2_IP4283

1

2

3

4

5

R246

30V

READY

NC_4

10

NC_3

9

GND_2

8

NC_2

7

NC_1

6

NC_4

10

NC_3

9

GND_2

8

NC_2

7

NC_1

6

HDMI2_DET

+5V_USB

R243

R244

2.7K

READY ZD242

READY ZD243

HDMI2_CKHDMI2_CK+

HDMI2_D0HDMI2_D0+

HDMI2_D1HDMI2_D1+

HDMI2_D2HDMI2_D2+

R247 100

R248 100

HDMI2_SDA HDMI2_SCL

B

HPD

19

+5V_POWER

18

DDC/CEC_GND

17

SDA

16

SCL

15

NC

14

CEC

13

CLK-

12

CLK_SHIELD

11

CLK+

10

DATA0-

9

DATA0_SHIELD

8

DATA0+

7

DATA1-

6

DATA1_SHIELD

5

DATA1+

4

DATA2-

3

DATA2_SHIELD

2

DATA2+

1

C

Q230

MMBT3904(NXP)

E

R230

HDMI1_HPD

C1+

1

V+

2

C1-

3

C2+

4

C2-

5

V-

6

DOUT2

7

RIN2

8

C202

0.1uF

C203

0.1uF

C204

0.1uF

C205

0.1uF

With UART IC

10K

SHIELD

20

JK203

HDMI2_HPD

R241 10K

SHIELD

20

B

HPD

19

+5V_POWER

18

DDC/CEC_GND

17

SDA

16

SCL

15

NC

14

CEC

13

CLK-

12

CLK_SHIELD

11

CLK+

10

DATA0-

9

DATA0_SHIELD

8

DATA0+

7

DATA1-

6

DATA1_SHIELD

5

DATA1+

4

DATA2-

3

DATA2_SHIELD

2

DATA2+

1

C

Q240

MMBT3904(NXP)

E

JK204

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

ESD_HDMI_IP4294

D234-*1 IP4294CZ10-TBR

10

1

9

2 3

8

4

7 6

5

ESD_HDMI_IP4294

D235-*1 IP4294CZ10-TBR

10

1

9

2 3

8

4

7 6

5

32/42LB550A

INPUT2

ESD_HDMI_IP4294

D244-*1 IP4294CZ10-TBR

10

1

9

2 3

8

4

7 6

5

ESD_HDMI_IP4294

D245-*1 IP4294CZ10-TBR

10

1

9

2 3

8

4

7 6

5

2013/08/15

2 7

EAX65550501

LGE Internal Use Only

LB45B/LT5B

AUAMP_SDA

AUAMP_SCL

+3.3V_M

I2S_SDO

I2S_WS

I2S_SCK

R308

4.7K

R309

4.7K

R306 100

R307 100

SW_RESET

C320

1000pF

50V

I2S_MCLK

NC_1

NC_2

GND NC_3 DVDD

WCK

BCK

SDA

R304 100

VDD_IO

[EP]GND

1 2 3 4 5 6 7 8 9 10

SCL

CLK_I

GND_IO

39

40

THERMAL

41

11

12

38

13

L301

+3.3V_M

BLM18PG121SN1D

C321 10uF

6.3V

C322

0.1uF 16V

VDD_PLL

C301

0.1uF 16V

OPT

C302

C303

0.1uF 1uF

16V

10V

SDATA

C305 33pF 50V

R301 100

R302 100

R303 100

C306 33pF 50V

FAULT

MONITOR_0

50V

C319

22000pF

PGND1A

BST1A

RESET

AD

34

35

36

37

IC301

NTP7514

0x54

14

15

16

17

BST2B

PGND2B

MONITOR_1

MONITOR_2

C308

22000pF

50V

PVDD1A

OUT1A

32

33

18

19

OUT2B

PVDD2B20PVDD2A

PVDD1B

31

30 29 28 27 26 25 24 23 22 21

+24V_AMP

C318

0.1uF 50V

OUT1B PGND1B BST1B VDR1 NC_4 AGND VDR2 BST2A PGND2A OUT2A

C309

0.1uF 50V

C317 10uF 35V

+24V_AMP

C310 10uF 35V

C315 22000pF 50V

C311 22000pF 50V

C31 2 1uF 10V

R313

12

C325 390pF

50V C326

390pF 50V

R315

12

R317

12

C327 390pF

50V

C328 390pF

50V

R319

12

C314 1uF 10V

R314

R316

12

R318

R320

TAIYO YUDEN

L303-*1

10.0uH

ABCO

12

L303 10uH

L304 10uH

ABCO

TAIYO YUDEN

L304-*1

10.0uH

TAIYO YUDEN

L305-*1

10.0uH

ABCO L305 10uH

L306

10uH

ABCO

TAIYO YUDEN

L306-*1

10.0uH

C329

0.47uF 50V

C333

0.47uF

50V

C330

0.1uF 50V

C331

0.1uF 50V

C334

0.1uF

50V

C335

0.1uF

50V

R322

4.7K

R323

4.7K

R324

4.7K

R325

4.7K

SPK_L+

SPEAKER_L

SPK_L-

SPK_L+ SPK_LSPK_R+ SPK_R-

SPK_R+

SPEAKER_R

SPK_R-

JP304

JP303

JP302

JP301

SPK_L+

SPK_L-

SPK_R+

SPK_R-

4

3

2

1 .

SMAW250-H04R

P301

POWER_DET

READY

R311

100

AUDIO_OUT AMP : GAIN X 4

IC302

AS324MTR-E1

MNT_LOUT

MNT_ROUT

C350

0.1uF 16V

C355

0.1uF 16V

P_12V

Q350 MMBT3904(NXP)

C

B

E

R350

4.7K

MNT_L_AMP

MNT_R_AMP

P_12V

Q351 MMBT3904(NXP)

C

B

E

R35 9

4.7 K

R351 1K

C351 6800pF 50V

R358

C356 6800pF 50V

R354 5.6K

1K

10K

R352

C352 33pF 50V

R355

5.6K

33pF

C354

R356

10K

P_12V

50V

R353

6.8K

C353

0.1uF 16V

R357

6.8K

1 OUT1

2 INPUT1-

3 INPUT1+

4 VCC

5 INPUT2+

6 INPUT2-

7 OUT2 8OUT3

14OUT4

13INPUT4-

12INPUT4+

11GND

10INPUT3+

9INPUT3-

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

32/42LB550A

AUDIO

2013/08/15

3 7

EAX65550501

LGE Internal Use Only

LB45B/LT5B

A1

47

SHIELD

PAL

TU401 TDJH-G101D

B1[+3.3V]

1

NC_1

2

IF_AGC

3

SCL

4

SDA

5

IF[P]

6

IF[N]

7

NC_2

8

NC_3

9

B1

R413

10

PAL

R414

10

PAL

Close to the tuner

IF

close to the tuner pin.

C406

C405

100pF

0.1uF

50V

16V

R412

C410

0.1uF 16V

100

NTSC

R413-*1 0

NTSC R414-*1 0

A1

47

SHIELD

C404 22uF

6.3V

NTSC

TU403 TDJH-H101F

B1[+3.3V]

1

NC_1

2

IF_AGC

3

SCL

4

SDA

5

IF[P]

6

IF[N]

7

NC_2

8

NC_3

9

B1

+3.3V_TU

BLM18PG121SN1D

C412

C411

0.1uF

10uF

16V

6.3V

IF_AGC

should be guarded by ground

L401

IF_P

IF_N

+3.3V_M

C402 47pF 50V

C403 47pF 50V

R405

33

R406

33

+3.3V_TU

R407

2.2K

R408

2.2K

TUNER_SCL

TUNER_SDA

KEY1

KEY2

IR/LED+Control

+3.5V_ST

R422

R421

10K

C423

0.1uF

OPT

C421

0.1uF

C424 1000pF 50V

16V

LED

LED_R_Zener

ZD404

IR_Zener

ZD403

C426

100pF

50V

OPT

C425

0.1uF 16V

P421

12507WR-10L

1

2

3

4

5

6

7

8

9

10

11

ZD401

SD05

ZD402

SD05

+3.5V_ST

R423

3.3K OPT

IR

OPT

C422

0.1uF

L421

BLM18PG121SN1D

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

32/42LB550A

TUNER & IR

2013/08/15

4 8

EAX65550501

LGE Internal Use Only

HDMI2_SDA

HDMI2_D0+

HDMI2_D1-

RX0P_D

DDCDD_DA

RX1N_D

125

126

127

THERMAL

129

LGE6841 (ATV_13)

41

42

AVDD3P3_DADC

AVDD3P3_DMPLL

+3.3V_M

C537 33pF

[EP]

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

HDMI2_D1+

RX1P_D

128

39

LB45B/LT5B

VDDC_3.3

COMMON_VIN

AV2_VIN

C505

0.1uF

R506

33

MNT_L_AMP MNT_R_AMP

C522

220pF

HDMI2_SCL

HDMI2_D2-

HDMI2_D2+

HDMI1_HPD

HDMI1_CK-

HDMI1_CK+

HDMI1_D0-

HDMI1_D0+

HDMI1_D1-

HDMI1_D1+

HDMI1_SDA

HDMI1_D2-

HDMI1_D2+

HDMI1_SCL

COMP_PB

C513

0.047uF

COMMON_LIN

COMMON_RIN

C523 220pF

VDDC_3.3

R523

33

R502

33

COMP_PR

R505

33

MNT_VOUT

AV2_LIN

AV2_RIN

R510 220K

R508

100

R509

100

R511 220K

VDDC

C507

0.1uF

C509 1000pF

C510

0.047uF

R504

33

C512

0.047uF

AU_3.3V

L506

120-ohm

C518 2.2uF

C519

2.2uF

C506

0.1uF

C508

R501

0.047uF

33

C550

0.047uF

C516 10uF

C520 2.2uF

C521

2.2uF

DDCDD_CK

HOTPLUG_A

AVDD_MOD_1

DDCDA_DA

DDCDA_CK

AVDD3P3_ADC

C511

R503

68

0.047uF

C514

R507

68

0.047uF

C515

0.1uF

C517

0.1uF

RX2N_D RX2P_D

RXCKN_A RXCKP_A

RX0N_A RX0P_A

RX1N_A RX1P_A

RX2N_A RX2P_A

ARC VDD

HSYNC1

BIN1P

SOGIN1

GIN1P GIN1M RIN1P

VSYNC1

CVBS1 CVBS0

VCOM

CVBSOUT1

AVDD_AU33

AUREF

VAG

LINEIN_L1 LINEIN_R1 LINEIN_L3 LINEIN_R3 LINEOUTL3 LINEOUTR3

XTALO40XTALI

C532

3.3V_DMPLL

0.1uF

AVDD33_DEMOD

C530 15pF

R512

1M

X501

24MHz

C531

15pF

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES

C536 33pF

C533

0.1uF

R513

100

C534

0.1uF

50V

IF_P

OPT

C551

220pF 50V

L521 100NH

OPT

R514

100

C535

0.1uF

Close to MSTAR

IF_N

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.

MAIN SOC

HDMI2_D0-

HDMI2_CK+

RXCKN_D

RXCKP_D

RX0N_D

123

124

43

VIFP44VIFM

IFAGC

R517 10K

R524

0

IF_AGC

HDMI2_HPD

HDMI2_CK-

GND

HOTPLUG_D

120

121

122

45

46

47

VSS

AVDD_DDR

C542

0.1uF

AVDD_DDR

C541 22000pF 50V

Close to MSTAR

MUTE_AOUT

IR

HW_RESET

CEC

HWRESET

118

119

I2S_MCLK

+3.5V_ST

R519

4.7K

R518

100

R546

100

GPIO68

GPIO70

IRIN

GPIO69/I2S_OUT_MCK

115

116

117

IC501

48

49

50

51

52

GPIO56

GPIO6053GPIO61

GPIO55/I2S_OUT_WS

GPIO57/I2S_OUT_BCK

R521

R520

100

GPIO58/I2S_OUT_SD

I2S_SCK

I2S_WS

I2S_SDO

TUNER_SCL

C543

0.1uF

SW_RESET

AUAMP_SCL

AUAMP_SDA

KEY1

R543

R544

100

R545 100

R542 100

SAR0/GPIO75

SAR1/GPIO74

SAR2/GPIO73

SAR3/GPIO72

111

112

113

114

54

55

56

VDDP

LVA4P57LVA4M58LVA3P59LVA3M

VDDC_1

TUNER_SDA

C544

0.1uF

VDDC

VDDC_3.3

+3.5V_ST

R539

4.7K

KEY2

LED

AVDD_DDR

C549

0.1uF

R541

100

110

R537

R540

22

1K

DDCA_DA

GPIO67

AVDD_DDR_2

107

108

109

60

LVACLKP

RXA3+

RXA3-

RXACK+

RXA3+

RXA3-

RXACK+

4.7K

R538

PWM_DIM

DSUB_SCL

DSUB_SDA

R534

1K

R536

R535

22

DDCA_CK

106

61

TESTPIN

PWM0/GPIO26

PWM1/GPIO25

104

105

62

63

LVA2P64LVA2M

LVACLKM

AVDD_MOD_2

RXA2+

RXACK-

C545

0.1uF

VDDC_3.3

RXA2-

RXA2+

R533

103

102 101 100

RXA2-

0

99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65

GPIO64 GPIO63

AVDD_MOD_4

USB0_DP USB0_DM SPI_CZ SPI_DO SPI_DI SPI_CK

PWM3/GPIO25 PWM2/GPIO24

GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7

INT/GPIO65

VDDC_2 LVB0M LVB0P LVB1M LVB1P

AVDD_MOD_3

LVB2M LVB2P LVBCKM LVBCKP LVB3M LVB3P LVB4M LVB4P LVA0M LVA0P LVA1M LVA1P

*H/W OPTION

R531

10K

C548

0.1uF

R530

100

R547

10K

R548

10K

R528

100

R527

10K

R549

100

RXB0-

RXB0+

RXB1-

RXB1+

RXB2-

RXB2+

RXBCK-

RXBCK+

RXB3-

RXB3+

RXA0-

RXA0+

RXA1-

RXA1+

INV_ON

RL_ON

VDDC_3.3

RXB0-

RXB0+

RXB1-

RXB1+

RXB2-

RXB2+

RXBCK-

RXBCK+

RXB3-

RXB3+

RXA0-

RXA0+

RXA1-

RXA1+

HD FHD

LOW

+3.3V_M

SPI_CZ

SPI_DO

SPI_DI

SPI_CLK

FLASH_WP

HW_OPT2

HDMI1_DET

HDMI2_DET

EEP_SDA

POWER_DET

VDDC

VDDC_3.3

BIG INCH

HW_OPT1

SMALL INCH

+3.5V_ST

C547

0.1uF

C546

0.1uF

FHD

R550

4.7K

HD

R551

4.7K

USB_DP

USB_DN

POWER_SW

PANEL_ON

HW_OPT1

EEP_SCL

HIGHHW_OPT

+3.3V_M

R590

4.7K

R591

4.7K

PD_+12V

R581

2.7K

R582

1.2K

HW_OPT2

P_12V

FLASH_WP

H/W RESET

R580

0

PD_+3.5V

MSTAR Vcc

+1.2V_VDDC

+1.8V_M

L500

120-ohm

L501

120-ohm

+3.5V_ST

EEPROM(64K)

A0

A1

A2

GND

SERIAL FLASH(2MB)

10K

R570

SPI_CZ

SPI_DO

ROHM

IC504

BD48K28G

VDD

C560

0.1uF

32/42LB550A

MAIN SOC 5 7

2

3

1

GND

IC504-*1

APX803D29

VCC

3

GND

C562

4.7uF 10V

ST 1.26V

VDDC

C501

10uF

6.3V

C502 10uF

6.3V

L502

120-ohm

C504 10uF

6.3V

L503

120-ohm

L504

120-ohm

L505

120-ohm

IC503

BR24G256FJ-3

1

2

3

4

VOUT

DIODE

8

7

6

5

ROHM_EEPROM

R571

100

R572

100

R573

100

SO/SIO1

R561

10K

RESET

2

1

DO[IO1]

WP[IO2]

C503

4.7uF

VCC

WP

SCL

SDA

GND

READY

CS

GND

CS

WP

R562 470

C561

4.7uF 10V

R563

62K

+3.5V_ST

C573 22pF

W25Q64FVSSIG

DDR 1.8V

AVDD_DDR

ST 3.3V

VDDC_3.3

AVDD33_DEMOD

AU_3.3V

3.3V_DMPLL

C572

0.1uF 16V

R578

C574

R579

22pF

READY

WINBOND

IC502

1

2

3

4

1

2

3

4

R564

10

C563

0.1uF 16V

R577

R569

4.7K

22

+3.5V_ST

VCC

8

%HOLD[IO3]

7

CLK

6

DI[IO0]

5

VCC

8

HOLD

7

IC502-*1

SCLK

6

MX25L6406EM2I-12G MACRONIX

SI/SIO0

5

POWER_DET

2013/08/15

IC503-*1

AT24C256C-SSHL-T

A0

1

A1

2

A2

3

GND

4

EEP_SCL EEP_SDA

C570

0.1uF 16V

R574

100 R575

100

C571

0.1uF 16V

READY

HW_RESET

ATML_EEPROM

VCC

8

WP

7

SCL

6

SDA

5

SPI_CLK

SPI_DI

EAX65550501

LGE Internal Use Only

LB45B/LT5B

FHD

P602

FI-RE51S-HF-J-R1500

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

RXA3+ RXA3RXACK+ RXACK-

RXA2+

RXA2-

RXA1+ RXA1-

RXA0+ RXA0-

RXB3+ RXB3-

RXBCK+

RXBCK-

RXB2+ RXB2-

RXB1+ RXB1-

RXB0+ RXB0-

FHD

C606

0.1uF 16V

OPT C605 1000pF 50V

PANEL_VCC

OPT C604 10uF 16V

FHD

L602

120OHM

HD

P601

FF10001-30

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

.

[30]

[29]

[28]

[27]

[26]

[25]

[24]

[23]

[22]

[21]

[20]

[19]

[18]

[17]

[16]

[15]

[14]

[13]

[12]

[11]

[10]

[09]

[08]

[07]

[06]

[05]

[04]

[03]

[02]

[01]

HD

C603

0.1uF 16V

RXA0RXA0+

RXA1RXA1+

RXA2RXA2+

RXACK-

RXACK+

RXA3RXA3+

OPT C602 1000pF 50V

PANEL_VCC

OPT

C601 10uF 16V

L601

120OHM

HD

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.

LVDS

32/42LB550A

LVDS

2013/08/15

6 7

EAX65550501

LGE Internal Use Only

LB45B/LT5B

** 3.5V_ST -> 1.26V VDDC

+3.5V_ST

C701

10uF

10V

2012

L704

500-ohm

+24V_AMP

P_12V

+3.5V_ST

ZD702

SD05

ZD701 20V READY

RL_ON

C705

0.1uF 16V

MMBT3906(NXP)

Q722 EBC

C702

0.1uF 16V

C707

0.1uF 50V

FROM LIPS & POWER B/D

SMAW200-H18S5

PWR_ON

L701

500-ohm

L702

120OHM

L703

120OHM

3.5V

3.5V GND 24V GND 12V 12V GND

1 3 5 7 9 11 13 15 17

P701

19

10 12 14 16 18

2 4 6 8

DRV_ON PDIM#1

3.5V PDIM#2 24V GND 12V NC GND

PWM_DIM_120HZ

R729-*1

100

PWM_DIM_60HZ

R729

1K

100

R728

PWM_DIM_120HZ

PWM_DIM

R710 100

+3.3V_M

R714 1K

C

E

MMBT3904(NXP)

B

Q703

R716 10K

+3.5V_ST

R715 10K

INV_ON

+3.5V_ST

C740 10uF

6.3V

R744

10K

C741

0.1uF 16V

** 3.3V_M -> 1.8V_M

+3.3V_M

V0 = 0.8*(1+(R2/R1))

IC701

MP20051

[EP]GND

C743 10uF

6.3V

9

THERMAL

OUT_1

1

OUT_2

2

FB

3

GND

4

C744

0.1uF 16V

IN_2

IN_1

8

7

NC

6

EN

5

IC711

AP1117E18G-13

IN

3

2

OUT

C745 10uF

6.3V

R741

ADJ/GND 1

R2

1%

4.7K

R1 1%

R740

2.7K

+1.2V_VDDC

OUT:1.26V

R742

C742 10uF

6.3V

1

Add for improving main IC Burtn issue

2.5V

ZD703

+1.8V_M

Add for improving main IC Burtn issue

5V

ZD704

.

**12V->USB 5V

IC709

GND

SS

IN

SW

MP1497DJ

1

2

3A

3

4

P_12V

L770

120OHM

C774

0.1uF

Closed IC709

C770

C772

10uF

0.1uF

16V

** Jig Point_GND

JP708

JP709

JP710

** +3.5V_ST -> 3.3V_M

+3.5V_ST

C750

0.1uF

NR8040T4R7N

L771

C771 1uF 25V

R771

FB

8

VCC

7

EN

6

BST

5

6.8uH

Closed IC709

33

R778 47K

C775

0.1uF 16V

R777

100K

C773

+3.3V_M

0.1uF 16V

V0 = 0.8*(1+(R1/R2))

OUT:5V

R1

R770

43K

1%

R2

R772

8.2K

1%

C776 22uF 10V

OPT

C777 10uF 10V

5.6B

ZD700

+5V_USB

16V

POWER_SW

READY

R750

10K

R747 10K

R748 33K

R749

2.2K

C

B

E

AO3435

C753

4.7uF 10V

Q711 MMBT3904(NXP)

Q710

S

G

C752

0.1uF 16V

C754

10uF

6.3V

+3.3V_M

L750

BLM18PG121SN1D

D

** Switch Panel-Vcc

P_12V

PANEL_VCC

JP711

PANEL_ON

OPT

C762

0.1uF 25V

L761 120OHM

B

R761

33K

R762

5.6K

C

Q721 MMBT3904(NXP)

E

C760 10uF

16V

Q720

DMP2130L

S

G

DIODES

D

C761

0.1uF 16V

Q720-*1

AO3407A

S

G AOS

D

R765

5.6K

R766

5.6K

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.

POWER

32/42LB550A

2013/08/15

7 7POWER

Normal

audio

Y

N

Move to No video/No audio

No video Normal audio

Check Back Light On with naked eye

On

Y N Check Power Board

24v, 12v,3.5v etc.

Normal

voltage

Y

N

Replace T-con Board or module

Repair Power Board or parts

Check Power Board 93.2~118.5V v output

Normal voltage

Y

Replace Inverter

or module

N

Repair Power Board or parts

End

Always check & record S/W Version and White Balance value before replacing the Main Board

Replace Main Board

Re-enter White Balance value

※Precaution

Established

date

Standard Repair Process

Revised date

1/14

LCD TV

Error

symptom

A. Video error

No video/ Normal audio

☞A4 ☞A1

☞A2

☞A6 & A3

First of all, Check whether all of cables between board is inserted properly or not.

(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)

2013. 01 .24

LGE Internal Use Only

Normal

voltage?

Check various voltages of Power Board ( 3.5V,12V,20V or 24V…)

No Video/ No audio

Check and replace MAIN B/D

Y

Replace Power Board and repair parts

N

End

Standard Repair Process

A. Video error

No video/ No audio

☞A4

Established

date

Revised date

2/14

LCD TV

Error

symptom

2013. 01 .24

LGE Internal Use Only

A. Video error

Picture broken/ Freezing

Y

N

☞ A5

N

Check RF Signal level

Normal

Signal?

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Check

S/W Version

S/W Upgrade

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

→ DVD Player ,Set-Top-Box, Different maker TV etc`

SVC

Bulletin?

Replace

Main B/D

Check

Tuner soldering

Normal

Picture?

Y

N

Y

Close

Normal

Picture?

Y

Close

Normal

Picture?

Y

Contact with signal distributor

or broadcaster (Cable or Air)

N

Normal

Picture?

Y

Close

N

☞ A6

Standard Repair Process

Established

date

Revised date

3/14

LCD TV

Error

symptom

2013. 01 .24

LGE Internal Use Only

A. Video error

Tuning fail, Picture broken/ Freezing

Y

N

☞ A5

Check RF Signal level

Normal Signal?

Check

S/W Version

S/W Upgrade

SVC

Bulletin?

Normal

Picture?

Y

N

Y

Close

Check RF signal cable Check whether other equipments have problem or not. (By connecting RF Cable at other equipment) → Set-Top-Box, Different maker TV etc

☞ A6

Standard Repair Process

Established

date

Revised date

4/14

LCD TV

Error

symptom

Contact with

signal distributor

or broadcaster

Close

N

Check

Tuner soldering

Replace

Main B/D

2013. 01 .24

LGE Internal Use Only

Color

error?

Y

N

※ Check and replace Link Cable (LVDS) and contact condition

Y

N

Replace Main B/D

Color

error?

Check error color input mode

Check color by input

-AV

-COMPONENT

-HDMI

Y

External device

/Cable

normal

AV/

Component

error

Check external device and cable

Y

External device

/Cable

normal

HDMI

error

Check external

device and cable

Replace Main B/D

N

A. Video error

Color error

☞A7

N

Y

End

Replace module

Request repair

for external

device/cable

Color

error?

Check Test pattern

☞A10

☞ A8/ A9

Standard Repair Process

Established

date

Revised date

5/14

LCD TV

Error

symptom

2013. 01. 24

LGE Internal Use Only

Screen

normal?

N

Y

Check external

device connection condition

Y

N

Check and replace Link Cable

Normal?

Y

Screen

normal?

Replace module

Check color condition by input

-AV

-Component

-HDMI

End

Vertical/Horizontal bar, residual image, light spot

Request repair

for external device

A. Video error

Vertical / Horizontal bar, residual image,

light spot, external device color error

☞A10

External device screen error-Color error

AV

Input

error

Connect other external device and cable

(Check normal operation of External Input, Component, and HDMI by connecting Jig, pattern Generator ,Set-top Box etc.

N

Y

Replace Main B/D

Screen

normal?

Check screen condition by input

-AV

-Component

-HDMI

Request repair for external device

Component

error

HDMI

Connect other external device and cable

(Check normal operation of External Input, Component, and HDMI by connecting Jig, pattern Generator ,Set-top Box etc.

Replace Main B/D

Screen

normal?

N

Y

Check S/W Version

Y

N

Check

version

S/W Upgrade

Y

N

Normal

screen?

End

Y

N

Replace Main B/D

Replace Module

Screen

normal?

End

Established

date

Revised date

6/14

LCD TV

Error

symptom

Standard Repair Process

☞A7

☞ A8/ A9

Check Test pattern

N

2013. 01 .24

LGE Internal Use Only

B. Power error

No power

Power LED

On?

Y

N

DC Power on by pressing Power Key On Remote control

Y

N

Normal

operation?

Check Power On ‘”High”

Check Power cord was inserted properly

Check Power LED

Replace

Power B/D

Measure voltage of each output of Power B/D

N

Y

Normal

voltage?

Replace Main B/D

Y

OK?

Replace Main B/D

N

Y

Normal?

Check ST-BY 3.5V

Replace Power B/D

N

Y

Normal

voltage?

Replace Power B/D

Y

☞A11

☞A12

☞A13

☞A4

Standard Repair Process

Established

date

Revised date

7/14

LCD TV

Error

symptom

. Stand-By: Red

※

Close

2013. 01 .24

LGE Internal Use Only

B. Power error

Off when on, off while viewing, power auto on/off

Error?

N

Y

Check Power Off Mode

Fix A/C cord & Outlet and check each 3 phase out

Check A/C cord

Check for all 3- phase power out

Check outlet

Replace Main B/D

CPU

Abnormal

(If Power Off mode is not displayed) Check Power B/D voltage

Y

N

Replace Main B/D

Normal

voltage?

Replace Power B/D

N

Y

Normal?

End

※ Caution Check and fix exterior of Power B/D Part

☞A14

☞A13

Established

date

Revised date

8/14

LCD TV

Error

symptom

Standard Repair Process

Status Power off List Explanation

Normal

"POWEROFF_REMOTEKEY" Power off by REMOTE CONTROL

"POWEROFF_OFFTIMER" Power off by OFF TIMER

"POWEROFF_SLEEPTIMER" Power off by SLEEP TIMER "POWEROFF_INSTOP" Power off by INSTOP KEY "POWEROFF_AUTOOFF" Power off by AUTO OFF "POWEROFF_ONTIMER" Power off by ON TIMER "POWEROFF_RS232C" Power off by RS232C "POWEROFF_SWDOWN" Power off by S/W Download "POWEROFF_UNKNOWN" Power off by unknown status except listed case

Abnormal

"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble

"POWEROFF_CPUABNORMAL" Power off by CPU Abnormal

* Please refer to the all cases which can be displayed on power off mode.

Abnormal

1

2013. 01 .24

LGE Internal Use Only

No audio Screen normal

Check user menu > Speaker off

Off

N

Y

Cancel OFF

Check audio B+ 24V of Power Board

Normal

voltage

Y

N

Replace Power Board and repair parts

Check Speaker disconnection

N

Y

Replace Speaker

Replace MAIN Board

End

C. Audio error

No audio/ Normal video

☞A15 ☞A16

Disconnection

Established

date

Revised date

9/14

LCD TV

Error

symptom

Standard Repair Process

2013. 01 .24

LGE Internal Use Only

→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio

C. Audio error

Wrecked audio/ discontinuation/noise

Wrecked audio/

Discontinuation/

Noise for

all audio

Check and replace speaker and connector

Wrecked audio/

Discontinuation/

Noise only

for RF

Wrecked audio/

Discontinuation/

Noise only for External Input

Connect and check other external device

N

Y

Normal

audio?

Check and fix external device

Replace Power B/D

N

Y

Normal

voltage?

Check input signal

-RF

-External Input

signal

Signal

normal?

(When RF signal is not received)

Request repair to external

cable/ANT provider

Y

Check audio B+ Voltage (24V)

Replace Main B/D

(In case of External Input signal error) Check and fix external device

Replace Main B/D

N

End

Established

date

Revised date

10/14

LCD TV

Error

symptom

Standard Repair Process

☞A16

2013. 01 .24

LGE Internal Use Only

D. Function error

Remote control & Local switch checking

Y

N

1. Remote control(R/C) operating error

Check R/C itself

Operation

Normal

operating?

Normal

operating?

Y

Close

Replace R/C

If R/C operate, Explain the customer cause is interference

from light in room.

Check R/C Operating

When turn off light

in room

Check & Replace

Baterry of R/C

Check & Repair

Cable connection

Connector solder

Normal

operating?

Check B+ 3.5V

On Main B/D

☞A17

Normal

Voltage?

Close

N

Check 3.5v on Power B/D

Replace Power B/D or

Replace Main B/D

(Power B/D don’t have problem)

☞A4

Check IR

Output signal

Normal

Signal?

N

Y

Repair/Replace

IR B/D

N

☞A17

Replace

Main B/D

Y

☞A17

Standard Repair Process

Established

date

Revised date

11/14

LCD TV

Error

symptom

2013. 02. 02

LGE Internal Use Only

Check technical information

- Fix information

- S/W Version

N

Y

Technical

information?

Check input

signal

Signal input?

Y

N

External Input and

Component

Recognition error

Check and fix external device/cable

RGB,HDMI/

DVI, Optical

Recognition error

Replace Main B/D

Fix in

accordance

with technical

information

D. Function error

External device recognition error

Established

date

Revised date

12/14

LCD TV

Error

symptom

Standard Repair Process

2013. 02. 02

LGE Internal Use Only

Check location of noise

Identify nose type

Circuit

noise

Replace PSU(with LED driver)

Replace LED driver

Mechanical

noise

Check location of noise

OR

※ When the nose is severe, replace the module (For models with fix information, upgrade the S/W or provide the description)

※ If there is a “Tak Tak” noise from the cabinet, refer to the KMS fix information and then proceed as shown in the solution manual (For models without any fix information, provide the description)

OR

※ Mechanical noise is a natural phenomenon, and apply the 1st level description. When the customer does not agree, apply the process by stage. ※ Describe the basis of the description in “Part related to nose” in the Owner’s Manual.

E. Noise

Circuit noise, mechanical noise

Established

date

Revised date

13/14

LCD TV

Error

symptom

Standard Repair Process

2013. 02. 02

LGE Internal Use Only

Replace module

Zoom part with exterior damage

Module

damage

Cabinet

damage

Replace cabinet

Replace remote controller

Remote

controller

damage

Stand

dent

Replace stand

F. Exterior defect

Exterior defect

Established

date

Revised date

14/14

LCD TV

Error

symptom

Standard Repair Process

2013. 02. 02

LGE Internal Use Only

Contents of LCD TV Standard Repair Process Detail Technical Manual

No. Error symptom Content Page Remarks

1

A. Video error_ No video/Normal audio

Check LCD back light with naked eye A1

2 LED driver B+ measuring method A2

3 Check White Balance value A3

4 Power Board voltage measuring method A4

6

A. Video error_ No video/Video lag/stop

TUNER input signal strength checking method A5

7 LCD-TV Version checking method A6

9

A. Video error_Color error

LCD TV connection diagram A7

10

11

Check Link Cable (LVDS) reconnection condition

A8 A9

12 Adjustment Test pattern - ADJ Key A10

13

A. Video error_Vertical/Horizontal bar, residual image, light spot

LCD TV connection diagram A8

14

Check Link Cable (LVDS) reconnection condition

A8 A9

15 Adjustment Test pattern - ADJ Key A10

16

<Appendix> Defected Type caused by T-Con/

Inverter/ Module

Exchange T-Con Board (1) A-1/5

17 Exchange T-Con Board (2) A-2/5

18 Exchange LED driver Board (PSU) A-3/5

19 Exchange Module itself (1) A-4/5

20 Exchange Module itself (2) A-5/5

Continue to the next page

LGE Internal Use Only

Contents of LCD TV Standard Repair Process Detail Technical Manual

No. Error symptom Content Page Remarks

21

B. Power error_No power

Check front display LED A11

22 Check power input Voltage & ST-BY 3.5V A12

23 Checking method when power is ON A13

24 POWER BOARD voltage measuring method A4

25

26

B. Power error_Off when on, off while viewing

POWER OFF MODE checking method A14

28

C. Audio error_No audio/Normal video

Checking method in menu when there is no audio

A15

29

Voltage and speaker checking method when there is no audio

A16

30

C. Audio error_Wrecked audio/discontinuation

Voltage and speaker checking method in case of audio error

A16

31

D. Function error_ No response in

remote controller, key error

Remote controller operation checking method A17

Continued from previous page

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Check Back Light On with naked eye

A. Video error_No video/Normal audio

A1

Established

date

Revised

date

Error

symptom

Content

LCD TV

Power On -> disjoint back case -> check lighting from the module

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Inverter B+ 24V measuring method

A. Video error_No video/Normal audio

A2

Established

date

Revised

date

Error

symptom

Content

LCD TV

Measure DC Voltage applying to Module from Power Board.

*Output Voltage from Power Board -> supply to Module.

Check Pin contacting statement and connection statement.

2013. 02 .15

*Output Voltage is depend on inch

32 inch : 65.6~86.9V 39 inch : 117.3~142.2V 42 inch : 141.8~164.3V

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Check White Balance value

A. Video error_No video/Normal audio

A3

Established

date

Revised

date

Error

symptom

Content

LCD TV

Entry method

1. Press the ADJ button on the remote controller for adjustment.

2. Enter into W/B ADJUST

3. After recording the R, G, B (GAIN, Offset) value of Color Temp (Cool/Medium/Warm),

re-enter the value after replacing the MAIN BOARD.

4. Confirm W/B ADJUST “OK” at In-start menu.

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Power Board voltage measuring method

A. Video error_No video/ Audio

A4

Established

date

Revised

date

Error

symptom

Content

LCD TV

Check the DC 24V, 12V, 3.5V.

18 Pin (Power Board ↔ Main Board) - Common

1

Power on

2

DRV ON

3

3.5V

4

PDIM

5

3.5V

6

N/C

7

GND

8

GND

9

24V

10

24V

11

GND

12

GND

13 12V 14 12V

15 12V 16

N.C

17

GND

18

GND

Edge LED

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

LCD-TV Version checking method

A. Video error_Video error, video lag/stop

1. Checking method for remote controller for adjustment

Press the IN-START with the remote controller for adjustment

Version

A6

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

LCD TV connection diagram (1)

A. Video error _Vertical/Horizontal bar, residual

image, light spot

As the part connecting to the external input, check the screen condition by signal

A7

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02.15

LGE Internal Use Only

1. Check and replace LVDS Cable

2. Check LVDS connection condition

Standard Repair Process Detail Technical Manual

Check and replace Link Cable(LVDS) and contact condition

A. Video error_Color error

A8/A9

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Adjustment Test pattern - ADJ Key

A. Video error_Color error

You can view 6 types of patterns(with White and Full White) using the ADJ Key

Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)

4.Video error (Classification of MODULE or Main-B/D!)

A10

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02.15

LGE Internal Use Only

Solder defect, CNT Broken

T-Con Defect, CNT Broken

Solder defect, CNT Broken

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section Solder defect, Short/Crack

Appendix : Exchange T-Con Board (1)

LGE Internal Use Only

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Solder defect, Short/Crack

Fuse Open, Abnormal power section

Noise

GRADATION

Abnormal Display

Appendix : Exchange T-Con Board (2)

LGE Internal Use Only

Appendix : Exchange PSU(LED driver)

No Light

Dim Light

No picture/Sound Ok

LGE Internal Use Only

Appendix : Exchange the Module (1)

Panel Mura, Light leakage

Press damage

Crosstalk

Press damage

Panel Mura, Light leakage

Press damage

Un-repairable Cases In this case please exchange the module.

LGE Internal Use Only

Vertical Block

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Vertical Line

Source TAB IC Defect

Vertical Block

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Horizontal line

Gate TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Appendix : Exchange the Module (2)

Un-repairable Cases In this case please exchange the module.

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Check front display LED

B. Power error _No power

A11

Established

date

Revised

date

Error

symptom

Content

LCD TV

ST-BY condition: Red

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Check power input voltage and ST-BY 3.5V

B. Power error _No power

A12

Established

date

Revised

date

Error

symptom

Content

LCD TV

Check the DC 24V, 12V, 3.5V.

18 Pin (Power Board ↔ Main Board) - Common

1

Power on

2

DRV ON

3

3.5V

4

PDIM

5

3.5V

6

N/C

7

GND

8

GND

9

24V

10

24V

11

GND

12

GND

13 12V 14 12V

15 12V 16

N.C

17

GND

18

GND

Edge LED

2013. 02.15

LGE Internal Use Only

Standard Repair Process Detail Technical Manual

Checking method when power is ON

B. Power error _No power

A13

Established

date

Revised

date

Error

symptom

Content

LCD TV

Check the DC 24V, 12V, 3.5V.

18 Pin (Power Board ↔ Main Board) - Common

1

Power on

2

DRV ON

3

3.5V

4

PDIM

5

3.5V

6

N/C

7

GND

8

GND

9

24V

10

24V

11

GND

12

GND

13 12V 14 12V

15 12V 16

N.C

17

GND

18

GND

Edge LED

2013. 02.15

LGE Internal Use Only

Entry method

1. Press the IN-START button of the remote controller

for adjustment

2. Enter to ENGINEER OPTION

3. Enter and Check POWER OFF HISTORY

Standard Repair Process Detail Technical Manual

POWER OFF MODE checking method

B. Power error _Off when on, off whiling viewing

A14

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02. 15

LGE Internal Use Only

Checking method

1. Press the MENU button on the remote controller

2. Select the AUDIO function of the Menu

3. Check whether TV Speaker is on

Standard Repair Process Detail Technical Manual

Checking method in menu when there is no audio

C. Audio error_No audio/Normal video

A15

Established

date

Revised

date

Error

symptom

Content

LCD TV

2013. 02.15

LGE Internal Use Only

Checking order when there is no audio

① Check the contact condition of or 24V connector of Main Board

② Measure the 24V input voltage supplied from Power Board

(If there is no input voltage, remove and check the connector)

③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal.

Standard Repair Process Detail Technical Manual

Voltage and speaker checking method when there is no audio

C. Audio error_No audio/Normal video

A16

Established

date

Revised

date

Error

symptom

Content

LCD TV

②

Check the DC 24V, 12V,

3.5V.

18 Pin (Power Board ↔ Main Board) - Common

1

Power on

2

DRV ON

3

3.5V

4

PDIM#1

5

3.5V

6

PDIM#2

7

GND

8

GND

9

24V

10

24V

11

GND

12

GND

13 12V 14 12V

15 12V 16

N.C

17

GND

18

GND

2013. 02. 15.

①

③

②

LGE Internal Use Only

Checking order 1, 2. Check IR cable condition between IR & Main board.

3. Check the st-by 3.5V on the terminal 4.

Standard Repair Process Detail Technical Manual

Remote controller operation checking method

D. Function error_ No response in remote controller,

key error

A17

Established

date

Revised

date

Error

symptom

Content

LCD TV

P600

1

GND

2

KEY1

3

KEY2

4

3.5V_ST

5

GND

6

LED_R/BUZZ 7 IR 8 GND 9 GND

①

③

2013. 01 .09

②

LGE Internal Use Only

LG 32LB515A-TH, 32LB55A-T, 32LB551C-TA, 42LB550A-TA, 42LB551C-TA Service manual & schematics

Specifications and Main Features

Frequently Asked Questions

User Manual