LG 42LN5100-TA Schematic

Internal Use Only

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LED TV

SERVICE MANUAL

CHASSIS : LB35B

MODEL : 42LN51** 42LN51**-T*

CAUTION

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

Printed in KoreaP/NO : MFL67732802 (1305-REV01)

CONTENTS

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

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

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

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

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

BLOCK DIAGRAM .................................................................................. 13

EXPLODED VIEW .................................................................................. 14

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 LB35B 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

PAL/SECAM B/G/D/K

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)

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

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

9. D-SUB INPUT S/W Upgrade Only Rear (1EA)

10. HDMI Input HDMI-DTV, Only PCM MODE Rear (2EA)

11. Audio Input (1EA) AV&Component L/R Input(2EA)

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

Cable S1~S47 1~71 S1~S47

PAL-I NTSC-M

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

6.1. PC Mode

* 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 Remarks

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

* Monitor Range Limits Min Vertical Freq - 58 Hz / Max Vertical Freq - 63 Hz Min Horiz. Freq - 28 kHz / Max Horiz. Freq - 68 kHz Pixel Clock - 150 MHz

Only for training and service purposes

- 7 -

6.2. DTV Mode

No. Resolution H-freq(kHz) V-freq.(kHz) 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 31.47 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 67.432 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 LB35B 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. MAIN PCBA Adjustments

3.1. ADC Calibration

3.1.1. Using D/L Jig

- 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)

3.2. EDID Download

▪ HD MODEL

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 17 01 03 80 A0 5A 78 0A F3 30 A4 54 46 96 26 20 0F 49 4B 21 08 00 45 40 01 01 61 40 01 01 01 01 30 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28 40 55 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30 50 48 88 35 00 BC 77 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 84 07 01 16 02 03 11 12 13 14 05 90 20 22 1F 10 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

▪ 8BIT FHD MODEL

** 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 17 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

a. White Balance Adjustment

EDID C/S data

Check sum

(Hex)

** HDMI 1 : 256Bytes

HD FHD (8Bit)

HDMI HDMI

Block 0 A5 C1

Block 1

44(HDMI1) 44 (HDMI1) 34(HDMI2) 34 (HDMI2)

ⓐ

Only for training and service purposes

- 9 -

4. White Balance Adjustment

4.1. Overview

4.1.1. 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

4.1.2. 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.

4.2. 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 Remocon (4) Video Signal Generator MSPG-925F 720p/204-Gray (Model: 217, Pattern: 49) * Color Analyzer Matrix should be calibrated using CS-1000.

4.3. Equipment connection

Co lor Anal yze r

Pro be

RS -232 C

Sig nal Sou rce

* If TV internal pattern is used, not needed

Pattern Gen era to r

4.4. 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 )

Explantion

RS- 232 C

Co mp ute r

RS- 232 C

(2) Adjustment Map

Cool

Medium

Warm

Adj. item

R Gain j g 00 C0 G Gain j h 00 C0 B Gain j i 00 C0 R Cut G Cut B Cut R Gain j a 00 C0 G Gain j b 00 C0 B Gain j c 00 C0 R Cut G Cut B Cut R Gain j d 00 C0 G Gain j e 00 C0 B Gain j f 00 C0 R Cut

G Cut

Command

(lower caseASCII) CMD1 CMD2 MIN MAX

Data Range

(Hex.)

Default

(Decimal)

4.5. Adjustment method

4.5.1. 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.

4.5.2. LED White balance table

- G-gain should be fixed.

(1) Cool Mode

1) Purpose : Adjust the color temperature to reduce the deviation of the module color temperature.

2) Pr inciple : To adjust the white ba lance without the saturation, Fix the G gain to 172 (default data) and change the others (R/B Gain ).

3) Adjustment mode : mode - Cool

(2) Medium / Warm Mode

1) Purpose : Adjust the color temperature to reduce the deviation of the module color temperature.

2) Pr inciple : To adjust the white ba lance without the saturation, Fix the one of R/G/B gain to 192 (default data) and decrease the others.

3) Adjustment mode : Two modes - Medium / Warm

Only for training and service purposes

- 10 -

4.6. Reference(White Balance Adjustment coordinate and color temperature)

(1) Luminance: 204 Gray, 80IRE (2) Standard color coordinate and tempera tur e using

CS-1000 (over 26 inch)

Mode Color Temp Color coordinate Remark

Cool

(C50)

Medium

(0)

Warm (W50)

■ Direct LED & 32” POLA W/B adjust target value

Target (Direct

LED)

13,000 K

9,300 K

6,500 K

Cool Medium Warm

x y x y x y

271 276 287 296 315 332

x = 0.269 (±0.002) y = 0.273 (±0.002)

x = 0.285 (±0.002) y = 0.293 (±0.002)

x = 0.313 (±0.002) y = 0.329 (±0.002)

* Test signal

- Inner pattern for W/B adjust

- External white pattern

(80IRE, 204gray)

7. GND and HI-POT Test

7.1. GND & HI-POT auto-check preparation

(1) Check the POWER CABLE and SIGNAL CABE insertion

condition

7.2. 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.

■ 42” POLA LED W/B adjust target value (42LS3450 series)

Target (Direct

LED)

Cool Medium Warm

x y x y x y

274 280 290 300 318 336

5. 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.

6. AUDIO output check

6.1. Audio input condition

(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation (2) CVBS, Component: 1KHz sine wave signal (0.4Vrms) (3) RGB PC: 1KHz sine wave signal (0.7Vrms)

6.2. 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 (8Ω Impedance)

7.3. 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

Only for training and service purposes

- 11 -

8. USB S/W Download

(optional, Service only)

(1) Put the USB Stick to the USB socket. (2) Automatically detecting update file in USB Stick.

- If your downloaded program version in USB Stick is lower than that of TV set, it didn’t work.

Otherwise USB data is automatically detected. (3) Show the message “Copying files from memory”.

(4) Updating is starting.

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

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

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

TV can lost all channel data. In this case, you have to channel recover. if all channel data is cleared, you didn't have a DTV/ATV test on production line.

* After downloading, have to adjust TOOL OPTION again.

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

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

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

9. Optional adjustments

9.1. Manual ADC Calibration

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

■ Enter Internal ADC calibration mode by pressing ‘’ or ‘OK’ key at ‘7. ADC Calibration’

EZ ADJUST

0. Tool Option1

1. Tool Option2

2. Tool Option3

3. Tool Option4

4. Tool Option5

5. Tool Option Commercial

6. Country Group

7. Area Option

8. ADC Calibration ►

9. White Balance

10. 10 Point WB

11. Test Pattern

12. EDID D/L

13. Sub B/C

14. Ext. Input Adjust

► Caution : Using ‘P-ONLY’ key of th e Facto ry Service

remote control when turns TV on.

9.2. Manual White balance Adjustment

9.2.1. Adjustment 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.

9.2.2. 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)

9.2.3. 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.

ADC Calibration

ADC Comp 480i

ADC Comp 1080p

ADC RGB

Start

Reset

NG

Only for training and service purposes

- 12 -

■ 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.

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

P400

110

KEY1

111

IR

117

IR/KEY

98

99

44

24Mhz

43

40

39

4

52

53

45

7

5

B+

IC401

To USB

TU_1.8V

M_3.3V

TU_3.3V

TUNER

A_OUT_12V

Out

Audio

Audio R-Out

Audio L-Out

37 38

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

IC302

x4 Gain

OP-AMP

AV2 In

AV1 In

Comp. R/L In

Y,Pb,Pr In

JK101

Module

POWER BOARD

P601/602

2 4 1

P701

13~1 5

P_ST 3.5V

5

3

P_24V

10

9

LVDS

Panel_Vcc

Q720

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

IC502

IC503

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

Q710

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

P301

(

Only for training and service purposes

- 13 -

400

521

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.

910

900

LV1

200

530

540

123

200T

Only LGD Module

500

120

122

510

A10

A9

A2

Set + Stand

Stand Base+Stand Body

300

Only for training and service purposes

- 14 -

301

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

COMPONENT / AV IN / AV AUDIO OUT

JK101

PPJ239-06

7H

4N

6H

4H

5G

4F

6F

8F

5E

8E

5D

7D

7N

6N

AV2RIN

AV2LIN

AV2_VIN

MNTROUT

MNTLOUT

COMMONRIN

D102

READY

ZD10 7

20V

ZD10 6

20V

D101

READY

C105 5600pF 50V

C103 5600pF 50V

ZD108

SD05

ZD110 20V

ZD109

20V

C

B

E

READY Q104

MMBT3904(NXP)

C

B

E

READY Q102

MMBT3904(NXP)

ZD105 20V

R112

75

R111

1K

R110

R107 220K

R116 220K

R113 220K

1K

R114

10K

C E

R108

10K

R117

10K

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. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

INPUT1

D104

READY

D106

READY

D108

READY

D103

READY

D105

READY

D107

READY

ZD102

SD05

ZD101

SD05

ZD100

SD05

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)

COMMON_VIN

AV2_VIN

TP101

OPT

R122

0

32LN5100

INPUT1

DEBUG

R120 75

P_12V

C E

DEBUG

MMBT3904(NXP) Q105

B

DEBUG

R123

220

R121

33

DEBUG

MNT_VOUT

2012/11/15

1 7

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

I2C Control

KJA-PH-1-0177

JK201

6 M6

1 M1

3 M3_DETECT

4 M4

DEBUG P201

12505WS-04A00

5

5 M5_GND

1

2

3

4

R205

0

W/O UART IC

R204

0

W/O UART IC

With UART IC

R201 100

+3.5V_ST

R206

0

W/O UART IC

With UART IC

R202 100

PM_RXD

RM_TXD

0.1uF

VCC

GND

+3.5V_ST

C201

P202

12507WS-04L

1

2

3

4

5

GND

DOUT1

RIN1

ROUT1

DIN1

DIN2

ROUT2

VCC

GND

With UART IC

IC201

MAX3232CDR

16

15

14

13

12

11

10

9

EAN41348201

HDMI(REAR)

R231

READY

ZD230

1K

READY ZD231

HDMI1_DET

R235

R234

4.7K

10K

HDMI1_CKHDMI1_CK+

HDMI1_D0HDMI1_D0+

HDMI1_D1HDMI1_D1+

HDMI1_D2HDMI1_D2+

+5V_USB

D230

BAT54C

R232

2.7K

A2CA1

R233

2.7K

READY ZD232

READY ZD233

R236 100

R237 100

HDMI1_SDA HDMI1_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

USB(SIDE)

3AU04S-305-ZC-(LG)

JK202

1234

USB DOWN STR EAM

5

DSUB_SCL

READY

ZD221

ZD220

30V

DSUB_SDA

Close to SIDE_USB

OPT

C220 10uF 10V

USB_DN

USB_DP

C221 22uF 10V

L220

120

+5V_USB

HDMI2_HPD

R241 10K

JK204

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

READY ZD240

R242 1K

READY ZD241

HDMI2_DET

R246

R245

4.7K

10K

HDMI2_CKHDMI2_CK+

HDMI2_D0HDMI2_D0+

HDMI2_D1HDMI2_D1+

HDMI2_D2HDMI2_D2+

+5V_USB

R243

2.7K

A2CA1

D240

BAT54C

R244

2.7K

READY ZD242

READY ZD243

R247 100

R248 100

HDMI2_SDA HDMI2_SCL

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

INPUT2

2012/11/1532LN5100

2 7

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

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

16V

GND DGND DVDD

SDATA

WCK

BCK

SDA

R304 100

VDD_IO

[EP]GND

1 2 3 4 5 6 7 8 9 10

SCL

CLK_I

GND_IO

38

39

40

THERMAL

41

11

12

13

L301

+3.3V_M

BLM18PG121SN1D

C321 10uF

6.3V

C322

0.1uF

AGND_PLL

VDD_PLL

C301

0.1uF 16V

OPT

C302

C303

0.1uF 1uF

16V

10V

R301 100

R302 100

R303 100

C305

C306

33pF

50V

DGND_PLL

FAULT

MONITOR_0

50V

C319

22000pF

PGND1A

BST1A

RESET

AD

34

35

36

37

IC301

NTP7513

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 VCC5 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

1uF 10V

C31 3

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

12

L303 10uH

L304 10uH

L305 10uH

L306 10uH

C329

0.47uF 50V

C333

0.47uF

50V

C330

0.1uF 50V

C331

0.1uF 50V

C334

0.1uF

50V

C335

0.1uF

R322

4.7K

R323

4.7K

R324

4.7K

R325

4.7K

50V

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

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. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

AUDIO

32LN5100

AUDIO

2012/11/15

3 7

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

B1

B2

READY

PAL

TU401 TDSH-G501D(B)

1

2

3

4

5

6

7

8

9

10

11

A1

A2

C430

0.1uF 250V

IF

NC

RESET

SCL

SDA

+B1[3.3V]

SIF

+B2[1.8V]

CVBS

IF_AGC

DIF[P]

DIF[N]

A1

+3.5V_ST

R422

R421

10K

KEY1

KEY2

+3.5V_ST

R423

4.7K OPT

IR

NTSC TU402 TDSS-H501F(B)

NC_1

1

RESET

2

SCL

3

SDA

4

+B1[3.3V]

5

NC_2

6

+B2[1.8]

7

NC_3

8

IF_AGC

9

DIF[P]

10

DIF[N]

11

X

B1

A1

Near the pin

C406 100pF 50V

12

SHIELD

+3.3V_TU

R403 100

C405

C404

0.1uF

22uF

16V

6.3V

R411

1

C409 100pF

50V

C408

0.1u F 16V

NTSC

R413-*1 0

R413

10

PAL

R414

10

PAL

Close to the tuner

NTSC R414-*1 0

R404 100K

C401

0.1uF 16V

C402 47pF 50V

C403 47pF 50V

C407 10uF

6.3V

R405

33

R406

33

+3.3V_TU

C410

0.1uF 16V

TUNER_RESET

R407

R408

2.2K

R412 100

should be guarded by ground

TUNER_SCL

TUNER_SDA

R409

1

1/10W

R410

1

1/10W

IC401

AP1117E18G-13

1

ADJ/GND

OUT

2

3

IN

IF_AGC

IF_P

IF_N

ZD402

SD05

ZD401

SD05

OPT

C422

0.1uF

L421

BLM18PG121SN1D

+3.3V_TU

C411

0.1uF 16V

OPT

C421

0.1uF

C423

0.1uF 16V

Size change,0929

L401

BLM18PG121SN1D

C412 10uF

6.3V

C424 1000pF 50V

+3.3V_M

IR

LED

C426

100pF

50V

OPT

C425

0.1uF 16V

P421

12507WR-08L

1

2

3

4

5

6

7

8

9

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

TUNER & IR

READY

C431

0.1uF 250V

R401

0

NTSC

32LN5100

TUNER & IR

2012/11/15

4 8

EAX65027101

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

LB35B/LC35B/LL35B

HDMI2_SCL

HDMI2_D2-

HDMI2_D2+

HDMI1_HPD

HDMI1_CK-

HDMI1_CK+

HDMI1_D0-

HDMI1_D0+

VDDC_3.3

COMMON_VIN

AV2_VIN

C505

0.1uF

R506

33

MNT_L_AMP MNT_R_AMP

C522

220pF

C523 220pF

HDMI1_D1-

HDMI1_D1+

HDMI1_SDA

HDMI1_D2-

HDMI1_D2+

HDMI1_SCL

COMP_PB

C513

0.047uF

COMMON_LIN

COMMON_RIN

R510 220K

R511 220K

VDDC_3.3

R523

33

R502

33

COMP_PR

R505

33

MNT_VOUT

AV2_LIN

AV2_RIN

R508

100

R509

100

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

C534

0.1uF

100

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. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED 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_RESET

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

FHD

R550

4.7K

HD

R551

4.7K

C547

0.1uF

C546

0.1uF

HW_OPT1

USB_DP

USB_DN

SPI_CZ

SPI_DO

SPI_DI

SPI_CLK

FLASH_WP

HDMI1_DET

HDMI2_DET

POWER_SW

PANEL_ON

HW_OPT1

EEP_SDA

EEP_SCL

POWER_DET

VDDC

VDDC_3.3

HIGHHW_OPT

H/W RESET

+3.5V_ST

C560

0.1uF

MSTAR Vcc

+1.2V_VDDC

+1.8V_M

+3.5V_ST

SERIAL FLASH(2MB)

10K

R570

FLASH_WP

IC504

APX803D29

VCC

RESET

3

2

1

GND

32LN5100

MAIN SOC 5 7

L500

120-ohm

L501

120-ohm

EEPROM(64K)

AT24C64D-SSHM-T

A0

1

A1

2

A2

3

GND

4

SPI_CZ

SPI_DO

C562

4.7uF 10V

10uF

L502

120-ohm

L503

120-ohm

L504

120-ohm

L505

120-ohm

IC503

R573

100

R561

10K

C501

6.3V

R571

100

R572

100

R562

470

C561

4.7uF 10V

ST 1.26V

VDDC

C502

C503

10uF

4.7uF

6.3V

ST 3.3V

C504 10uF

6.3V

+3.5V_ST

VCC

8

WP

7

SCL

6

SDA

5

C573 22pF

READY

W25Q64FVSSIG

CS

DO[IO1]

WP[IO2]

GND

R564

10

C563

R563

0.1uF

62K

16V

DDR 1.8V

AVDD_DDR

VDDC_3.3

AVDD33_DEMOD

AU_3.3V

3.3V_DMPLL

C572

0.1uF 16V

R578

22

C574

R579

22pF

22

READY

IC502

1

2

3

4

8

7

6

5

POWER_DET

2012/11/15

R569

4.7K

+3.5V_ST

VCC

%HOLD[IO3]

CLK

DI[IO0]

HW_RESET

R577

4.7K

R574 100

R575

100

C571

0.1uF 16V

READY

EEP_SCL EEP_SDA

C570

0.1uF 16V

SPI_CLK

SPI_DI

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

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

L602

HD

P601

FF10001-30

[30]

1

[29]

2

[28]

3

[27]

4

[26]

5

[25]

6

[24]

7

[23]

8

[22]

9

[21]

10

[20]

11

[19]

12

[18]

13

[17]

14

[16]

15

[15]

16

[14]

17

[13]

18

[12]

19

[11]

20

[10]

21

[09]

22

[08]

23

[07]

24

[06]

25

[05]

26

[04]

27

[03]

28

[02]

29

[01]

30

FHD

120

31

.

HD

C603

0.1uF 16V

RXA0RXA0+

RXA1RXA1+

RXA2RXA2+

RXACKRXACK+

RXA3RXA3+

OPT C602 1000pF 50V

PANEL_VCC

OPT

C601 10uF 16V

L601

120

HD

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

LVDS

32LN5100

LVDS

2012/11/15

6 7

EAX65027101

LGE Internal Use Only

LB35B/LC35B/LL35B

+24V_AMP

+3.5V_ST

P_12V

+3.5V_ST

ZD702

SD05

ZD701 20V READY

MMBT3906(NXP)

Q722 EBC

RL_ON

L701

16V

120

L702 120

L703

120

C705

0.1uF 16V

C702

0.1uF

C707

0.1uF 50V

**12V->USB 5V

P_12V

L770

120

C774

Closed IC709

C770 10uF 16V

FROM LIPS & POWER B/D

P701

SMAW200-H18S1

0.1uF

C772

0.1uF 16V

SS

IN

SW

GND

PWR_ON

IC709

MP1497DJ

1

2

3A

3

4

3.5V

3.5V GND 24V GND 12V 12V GND

1 3 5 7 9 11 13 15 17

C771 1uF 25V

R771

33

FB

8

VCC

7

EN

6

BST

5

19

2 4 6

8 10 12 14 16 18

.

NR8040T4R7N

L771

6.8uH

Closed IC709

R778 47K

C775

0.1uF 16V

R777

100K

C773

0.1uF 16V

DRV_ON P-DIM P-DIM2 GND 24V GND 12V NC GND

R1

R770

R2

R772

+3.3V_M

R710 100

R729

1K

PWM_DIM

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

43K

1%

8.2K

1%

OUT:5V

C776 22uF 10V

OPT

C777 10uF 10V

+3.3V_M

C

E

+5V_USB

R714 1K

R716 10K

B

Q703

MMBT3904(NXP)

+3.5V_ST

R715 10K

INV_ON

** 3.5V_ST -> 1.26V VDDC

+3.5V_ST

C740 10uF

6.3V

R744

10K

C741

0.1uF 16V

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

IC701

MP20051

[EP]GND

IN_2

IN_1

8

7

NC

6

EN

5

THERMAL

9

OUT_1

1

OUT_2

2

FB

3

GND

4

** 3.3V_M -> 1.8V_M

IC711

+3.3V_M

C743 10uF

6.3V

** +3.5V_ST -> 3.3V_M

+3.5V_ST

C750

0.1uF 16V

R750

10K

READY

R747 10K

POWER_SW

B

** Switch Panel-Vcc

P_12V

L761

120

R761

33K

IN

C744

0.1uF 16V

C753

R748

4.7uF

33K

10V

R749

2.2K

C

Q711 MMBT3904(NXP)

E

C760

4.7uF 16V

AP1117E18G-13

3

2

OUT

C745 10uF

6.3V

Q710

AO3435

S

G

D

AO3407A

S

R741

ADJ/GND

1

Q720

G

R2

1%

4.7K

R1 1%

R740

2.7K

L750

BLM18PG121SN1D

C752

0.1uF 16V

D

C761

0.1uF 16V

R742

C742 10uF

6.3V

+1.8V_M

R765

3.3K

1

C754 10uF

6.3V

OPT

R766

4.7K

+1.2V_VDDC

OUT:1.26V

+3.3V_M

PANEL_VCC

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.

POWER

** Jig Point_GND

JP709

JP710

JP708

JP711

PANEL_ON

B

R762

5.6K

C

Q721 MMBT3904(NXP)

E

32LN5100

2012/11/15

7 7POWER

Standard Repair Process

LGE Internal Use Only

Established

date

Revised date

LCD TV

Error

symptom

A. Video error

No video/ Normal audio

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,,,)

☞A4 ☞A1

N

Y

Check Back Light On with naked eye

☞A2

Check Power Board 93.2~118.5V v output

On

Normal voltage

N

Repair Power Board or parts

Y N Check Power Board

24v, 12v,3.5v etc.

Replace Inverter

Y

or module

Normal

voltage

Repair Power Board or parts

End

Y

N

No video Normal audio

Normal

audio

Move to No video/No audio

2013. 01 .24

1/14

Replace T-con Board or module

※Precaution

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

☞A6 & A3

Replace Main Board

1 / 36

Re-enter White Balance value

Standard Repair Process

LGE Internal Use Only

LCD TV

symptom

No Video/ No audio

Error

A. Video error

No video/ No audio

☞A4

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

Normal

voltage?

N

Replace Power Board and repair parts

Y

Check and replace MAIN B/D

Established

date

Revised date

End

2013. 01 .24

2/14

2 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

☞ A5

Check RF Signal level

Normal Signal?

N

Check RF Cable

Connection

1. Reconnection

2. Install Booster

Normal

Picture?

Y

N

Error

symptom

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

A. Video error

Picture broken/ Freezing

☞ A6

Normal

Picture?

N

Contact with signal distributor

or broadcaster (Cable or Air)

Y

Check

S/W Version

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

Established

date

Revised date

N

Tuner soldering

N

Check

2013. 01 .24

Normal

Picture?

Replace

Main B/D

3/14

Y

Close

N

Close

Y

Close

3 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Error

symptom

☞ A5

Check RF Signal level

Normal Signal?

N

A. Video error

Tuning fail, Picture broken/ Freezing

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

Y

Check

S/W Version

SVC

Bulletin?

Y

S/W Upgrade

Revised date

N

Check

Tuner soldering

Established

date

2013. 01 .24 4/14

Replace

Main B/D

Contact with

signal distributor

or broadcaster

Normal

N

Picture?

Y

Close

4 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

☞A7

Check color by input

-AV

-COMPONENT

-HDMI

☞A10

Check Test pattern

Error

symptom

Color

error?

Check error color input mode

Y

N

Component

A. Video error

Color error

☞ A8/ A9

※ Check and

replace Link Cable (LVDS) and contact condition

AV/

error

Color

error?

N

Check external device and cable

Y

Replace Main B/D

Established

date

Revised date

External device

/Cable

normal

N

Color

error?

End

Y

2013. 01. 24 5/14

Y

Replace module

N

Replace Main B/D

HDMI

error

Check external

device and cable

5 / 36

Request repair

for external

device/cable

N

External device

/Cable

normal

Y

Replace Main B/D

Standard Repair Process

LGE Internal Use Only

A. Video error

LCD TV

Error

symptom

Vertical / Horizontal bar, residual image,

light spot, external device color error

Vertical/Horizontal bar, residual image, light spot

☞A7

Check color condition by input

-AV

-Component

-HDMI

☞A10

Check Test pattern

Screen

normal?

N

Replace module

Check external

Y

device connection condition

Normal?

Request repair

for external device

External device screen error-Color error

Check screen condition by input

Check S/W Version

Check

version

Y

S/W Upgrade

Normal

screen?

Y

N

-AV

-Component

-HDMI

N

☞ A8/ A9

Check and

Y

replace Link Cable

AV

Input

error

Component

error

HDMI

Established

date

Revised date

Screen

normal?

End

N

Replace Main B/D

Y

Connect other external device and cable

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

Connect other external device and cable

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

2013. 01 .24

Screen

normal?

Request repair for external device

Screen

normal?

Y

N

6/14

Replace Module

N

Screen

normal?

Y

End

Replace Main B/D

End

6 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

☞A11

Check Power LED

. Stand-By: Red

Error

symptom

Power LED

On?

N

Check Power cord was inserted properly

Normal?

Y

※

Close

Y

N

Check ST-BY 3.5V

☞A12

B. Power error

No power

DC Power on by pressing Power Key On Remote control

Normal

voltage?

Y

N

Established

date

2013. 01 .24

Revised date

☞A13

Y

N

Check Power On ‘”High”

Replace Main B/D

Normal

operation?

☞A4

Measure voltage of each output of Power B/D

N

Y

Replace Main B/D

Normal

voltage?

Replace Power B/D

OK?

Y

7/14

Replace

Power B/D

Replace Power B/D

7 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Check outlet

Check A/C cord

Check for all 3- phase power out

Error

symptom

Error?

Y

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

B. Power error

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

☞A14

N

Check Power Off Mode

☞A13

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

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

Established

date

Revised date

CPU

Abnormal

1

Normal

voltage?

N

Replace Power B/D

2013. 01 .24

Replace Main B/D

Y

Replace Main B/D

Normal?

Replace Power B/D

Y

N

8/14

End

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

Status Power off List Explanation

"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

Normal

Abnormal

"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

"POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble

"POWEROFF_CPUABNORMAL" Power off by CPU Abnormal

8 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

No audio Screen normal

Error

C. Audio error

symptom

No audio/ Normal video

☞A15 ☞A16

Check user menu > Speaker off

Off

Y

Cancel OFF

Check audio B+ 24V

N

of Power Board

Established

date

Revised date

Normal

voltage

Replace Power Board and repair parts

Y

N

2013. 01 .24 9/14

Check Speaker disconnection

Disconnection

Y

Replace Speaker

9 / 36

N

Replace MAIN Board

End

Standard Repair Process

LGE Internal Use Only

LCD TV

Check input signal

-RF

-External Input

signal

Error

symptom

C. Audio error

Wrecked audio/ discontinuation/noise

Established

date

Revised date

2013. 01 .24

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

☞A16

Signal

normal?

N

Y

(When RF signal is not received)

Request repair to external

cable/ANT provider

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

Wrecked audio/

Discontinuation/

Noise for

all audio

Wrecked audio/

Discontinuation/

Noise only

for RF

Wrecked audio/

Discontinuation/

Noise only

for External Input

Check and replace speaker and connector

Replace Main B/D

Connect and check other external device

Check audio B+ Voltage (24V)

Normal

voltage?

N

Replace Power B/D

Replace Main B/D

Normal

audio?

Y

N

10/14

Y

End

Check and fix external device

10 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Error

symptom

Remote control & Local switch checking

1. Remote control(R/C) operating error

☞A17

Check R/C itself

Operation

Check R/C Operating

When turn off light

in room

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

from light in room.

Normal

operating?

N

Check & Replace

Baterry of R/C

operating?

Replace R/C

Y

Normal

Check & Repair

Cable connection

Connector solder

Close

N

D. Function error

Normal

operating?

Y

Close

N

☞A17

Check B+ 3.5V

On Main B/D

☞A4

(Power B/D don’t have problem)

Established

date

Revised date

Normal

Voltage?

Check 3.5v on Power B/D

Replace Power B/D or

Replace Main B/D

Y

N

2013. 02. 02

☞A17

Check IR

Output signal

11/14

Replace

Main B/D

Normal

Signal?

N

Repair/Replace

IR B/D

Y

11 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Check input

signal

Error

symptom

Y

Signal input?

N

Check and fix external device/cable

D. Function error

External device recognition error

Check technical information

- Fix information

- S/W Version

information?

accordance

with technical

information

Technical

Y

Fix in

External Input and

N

Component

Recognition error

RGB,HDMI/

DVI, Optical

Recognition error

Established

date

Revised date

2013. 02. 02 12/14

Replace Main B/D

12 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Identify nose type

Error

symptom

Circuit

noise

Mechanical

noise

Circuit noise, mechanical noise

Check location of noise

E. Noise

※ 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.

OR

Replace PSU(with LED driver)

Replace LED driver

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

OR

※ If there is a “Tak Tak” noise from the cabinet, refer to the KMS fix information and then proceed

OR

as shown in the solution manual (For models without any fix information, provide the description)

Established

date

Revised date

2013. 02. 02 13/14

13 / 36

Standard Repair Process

LGE Internal Use Only

LCD TV

Error

symptom

Zoom part with exterior damage

F. Exterior defect

Module

damage

Cabinet

damage

Remote

controller

damage

Exterior defect

Replace module

Replace cabinet

Replace remote controller

Established

date

Revised date

2013. 02. 02 14/14

Stand

dent

Replace stand

14 / 36

Contents of LCD TV Standard Repair Process Detail Technical Manual

LGE Internal Use Only

No. Error symptom Content Page Remarks

1

2 LED driver B+ measuring method A2

A. Video error_ No video/Normal audio

3 Check White Balance value A3

4 Power Board voltage measuring method A4

6

A. Video error_ No video/Video lag/stop

7 LCD-TV Version checking method A6

9

10

A. Video error_Color error

11

12 Adjustment Test pattern - ADJ Key A10

13

14

15 Adjustment Test pattern - ADJ Key A10

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

Check LCD back light with naked eye A1

TUNER input signal strength checking method A5

LCD TV connection diagram A7

Check Link Cable (LVDS) reconnection condition

LCD TV connection diagram A8

Check Link Cable (LVDS) reconnection condition

A8 A9

16

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

Defected Type caused by T-Con/ Inverter/ Module

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

Continue to the next page

15 / 36

Contents of LCD TV Standard Repair Process Detail Technical Manual

LGE Internal Use Only

Continued from previous page

No. Error symptom Content Page Remarks

21

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

28

29

30

31

B. Power error_No power

B. Power error_Off when on, off while viewing

C. Audio error_No audio/Normal video

C. Audio error_Wrecked audio/discontinuation

D. Function error_ No response in

remote controller, key error

Check front display LED A11

POWER OFF MODE checking method A14

Checking method in menu when there is no audio

Voltage and speaker checking method when there is no audio

Voltage and speaker checking method in case of audio error

Remote controller operation checking method A17

A15

A16

16 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_No video/Normal audio

Check Back Light On with naked eye

Established

date

Revised

date

2013. 02.15 A1

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

17 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_No video/Normal audio

Inverter B+ 24V measuring method

Established

date

Revised

date

2013. 02 .15 A2

Measure DC Voltage applying to Module from Power Board.

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

Check Pin contacting statement and connection statement.

*Output Voltage is depend on inch

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

18 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_No video/Normal audio

Check White Balance value

Established

date

Revised

date

2013. 02.15 A3

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.

19 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Edge LED

Error

symptom

Content

A. Video error_No video/ Audio

Power Board voltage measuring method

Established

date

Revised

date

2013. 02.15

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

18 Pin (Power Board ↔ Main Board) – Common

A4

1

3

5

7

9

11

13 12V 14 12V

15 12V 16

17

Power on

3.5V

GND

24V

GND

2

4

6

8

10

12

18

DRV ON

PDIM

N/C

GND

24V

GND

N.C

GND

20 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_Video error, video lag/stop

LCD-TV Version checking method

Established

date

Revised

date

2013. 02.15 A6

1. Checking method for remote controller for adjustment

Version

Press the IN-START with the remote controller for adjustment

21 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error _Vertical/Horizontal bar, residual

image, light spot

LCD TV connection diagram (1)

Established

date

Revised

date

2013. 02.15

A7

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

22 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_Color error

Check and replace Link Cable(LVDS) and contact condition

Established

date

Revised

date

2013. 02.15

A8/A9

1. Check and replace LVDS Cable

2. Check LVDS connection condition

23 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

A. Video error_Color error

Adjustment Test pattern - ADJ Key

Established

date

Revised

date

2013. 02.15

A10

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!)

24 / 36

Appendix : Exchange T-Con Board (1)

LGE Internal Use Only

Solder defect, CNT Broken

T-Con Defect, CNT Broken

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

25 / 36

Appendix : Exchange T-Con Board (2)

LGE Internal Use Only

Abnormal Power Section

Solder defect, Short/Crack

Abnormal Power Section

Fuse Open, Abnormal power section

Solder defect, Short/Crack

Abnormal Display

GRADATION

Noise

26 / 36

GRADATION

Appendix : Exchange PSU(LED driver)

LGE Internal Use Only

No Light

Dim Light

No picture/Sound Ok

27 / 36

Appendix : Exchange the Module (1)

LGE Internal Use Only

Panel Mura, Light leakage

Crosstalk

Panel Mura, Light leakage

Press damage

Crosstalk

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

Press damage

28 / 36

Appendix : Exchange the Module (2)

LGE Internal Use Only

Vertical Block

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Vertical Line

Source TAB IC Defect

Horizontal Block

Gate TAB IC Defect

Vertical Block

Source TAB IC Defect

Horizontal line

Gate TAB IC Defect

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

29 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

B. Power error _No power

Check front display LED

Established

date

Revised

date

2013. 02.15

A11

ST-BY condition: Red

30 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Edge LED

Error

symptom

Content

B. Power error _No power

Check power input voltage and ST-BY 3.5V

Established

date

Revised

date

2013. 02.15

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

18 Pin (Power Board ↔ Main Board) - 공통

A12

1

3

5

7

9

11

13 12V 14 12V

15 12V 16

17

Power on

3.5V

GND

24V

GND

2

4

6

8

10

12

18

DRV ON

PDIM

N/C

GND

24V

GND

N.C

GND

31 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Edge LED

Error

symptom

Content

B. Power error _No power

Checking method when power is ON

Established

date

Revised

date

2013. 02.15

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

18 Pin (Power Board ↔ Main Board) - Common

A13

1

3

5

7

9

11

13 12V 14 12V

15 12V 16

17

Power on

3.5V

GND

24V

GND

2

4

6

8

10

12

18

DRV ON

PDIM

N/C

GND

24V

GND

N.C

GND

32 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

B. Power error _Off when on, off whiling viewing

POWER OFF MODE checking method

Established

date

Revised

date

2013. 02. 15

A14

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

33 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

C. Audio error_No audio/Normal video

Checking method in menu when there is no audio

Established

date

Revised

date

2013. 02.15

A15

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

34 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

C. Audio error_No audio/Normal video

Voltage and speaker checking method when there is no audio

Established

date

Revised

date

2013. 02. 15.

A16

②

Check the DC 24V, 12V,

3.5V.

18 Pin (Power Board ↔ Main Board) -Common

②

1

3

5

7

9

11

13 12V 14 12V

15 12V 16

17

Power on

3.5V

GND

24V

GND

2

4

6

8

10

12

18

DRV ON

PDIM#1

PDIM#2

GND

24V

GND

N.C

GND

①

③

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.

35 / 36

Standard Repair Process Detail Technical Manual

LGE Internal Use Only

LCD TV

Error

symptom

Content

①

D. Function error_ No response in remote controller,

key error

Remote controller operation checking method

②

Established

date

Revised

date

2013. 01 .09

1 2

③

3 4 5 6 7 IR 8 GND 9 GND

A17

P600

GND KEY1 KEY2

3.5V_ST GND

LED_R/BUZZ

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

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

36 / 36