LG 19LS350S, 19LS350T Service manual

Internal Use Only

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

LED LCD TV

SERVICE MANUAL

CHASSIS : LD21A

MODEL : 19LS3500/350S/350T

MODEL : 19LS3500/350S/350T-ZA

CAUTION

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

Printed in KoreaP/NO : MFL67360701 (1202-REV00)

CONTENTS

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

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

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

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

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

DISASSEMBLY ...................................................................................... 16

BLOCK DIAGRAM ................................................................................. 17

EXPLODED VIEW .................................................................................. 18

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 mod-

ule 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 LCD TV used LD21A 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 drawing and s pe cificatio n b y p art 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

No. Item Specication Remarks

1 Market EU(PAL Market-37Countries) DTV & Analog (Total 37 countries)

DTV (MPEG2/4, DVB-T) :37 countries UK/Italy/Germany/France/Spain/Sweden/Finland/Netherlands/ Belgium/Luxemburg/ Greece/Denmark/Czech/ Austria /Hungary/Swiss/Croatia/Turkey Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/ Latvia/Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia Bosnia/Serbia/Albania/Kazakhstan/Belarus

DTV (MPEG2/4, DVB-T2): 8 countries

UK/Denmark/Sweden/Finland/Norway/Ireland/Ukraine/ Kazakhstan

DTV (MPEG2/4, DVB-C): 37 countries

UK/Italy/Germany/France/Spain/Sweden/Finland/Netherlands/ Belgium/Luxemburg/ Greece/Denmark/Czech/ Austria /Hungary/Swiss/Croatia/Turkey Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/ Latvia/Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia Bosnia/Serbia/Albania/Kazakhstan/Belarus

DTV (MPEG2/4,DVB-S): 29 countries

Italy/Germany/France/Spain/Netherlands/ Belgium/ Luxemburg/ Greece/ Czech/Austria /Hungary/Swiss/ Croatia/ Turkey/Slovenia/Poland/Portugal/ Morocco/Latvia/ Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia Bosnia/Serbia/Albania/ Belarus

Supported satellite : 22 satellites

HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102, ATLANTIC BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4, EUTELSAT-W3A, EUROBIRD 9A, EUTELSAT-W2A, HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/ KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HELLASSAT 2, EXPRESS AM1, TURKSAT 2A/3A, INTERSAT10

Only for training and service purposes

- 6 -

No. Item Specication Remarks

1) PAL-BG

2) PAL-DK

2 Broadcasting system

3 Receiving system

4 Scart Jack (1EA) PAL, SECAM Scart 1 Jack is Full scart and support RF-OUT(analog). 5 Video Input RCA(1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60

6 Component Input (1EA)

7 RGB Input RGB-PC

8 HDMI Input (3EA)

9 Audio Input (2EA)

10 SDPIF out (1EA) SPDIF out Some models(LD21A,LD21C) are not supported.

11 Earphone out (1EA)

12 USB (1EA or 2EA)

13 DVB

14 Ethernet (1EA) DLNA(Wired, DMP only) Some models (LD21A,LD21C) are not supported.

3) PAL-I/I’

4) SECAM L/L’

5) DVB-T/T2/C/S ► DVB-T

- Guard Interval(Bitrate_Mbit/s) 1/4, 1/8, 1/16, 1/32

- Modulation : Code Rate QPSK : 1/2, 2/3, 3/4, 5/6, 7/8 16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8

► DVB-T2

- Guard Interval(Bitrate_Mbit/s) 1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,

- Modulation : Code Rate

Analog : Upper Heterodyne Digital : COFDM, QAM

Y/Cb/Cr Y/Pb/Pr

HDMI1-DTV/DVI HDMI2-DTV HDMI3-DTV

RGB/DVI Audio Component & AV

Antenna, AV1, AV2, Component, RGB, HDMI1, HDMI2, HDMI3

EMF, DivX HD, For SVC (download)

DVB-T

DVB-C

DVB-S CI + : Germany(Astra HD+ )

QPSK : 1/2, 2/5, 2/3, 3/4, 5/6 16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6 256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

► DVB-C

- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s

- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM

► DVB-S/S2

- symbolrate DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s DVB-S (QPSK) : 2 ~ 45Msymbol/s

- viterbi DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8 DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10

Analog(D-SUB 15PIN) Some models (LD21A,LD21C) are not supported.

PC(HDMI version 1.3) Support HDCP The number of Input ports is different by model.

In case of the RGB/DVI Audio input, Some models(LD21A,LD21C) are not supported. Component & AV’s audio input is used by common port.

Some models(LD21A,LD21C) are not supported.

JPEG, MP3, DivX HD LM58, CM96: 2EA LS56, LS35, CS46, LS,34, LM34 : 1EA

CI : UK, Finland, Denmark, Norway, Sweden, Russia,

Spain, Ireland, Luxemburg, Belgium, Netherland

CI+ : France(Canal+), Italy(DGTVi) CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria

CI+ : Switzerland(UPC,Cablecom), Netherland(Ziggo),

Germany(KDG,CWB), Finland(labwise)

Only for training and service purposes

- 7 -

5. Video resolutions (2D)

5.1. Component Input (Y, CB/PB, CR/PR)

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

1 720*576 15.625 50.00 13.5 SDTV ,DVD 576I

2 720*480 15.73 60.00 13.5135 SDTV ,DVD 480I

3 720*480 15.73 59.94 13.50 SDTV ,DVD 480I

4 720*576 31.25 50.00 27.00 SDTV 576P

5 720*480 31.50 60.00 27.027 SDTV 480P

6 720*480 31.47 59.94 27.00 SDTV 480P

7 1280*720 37.50 50.00 74.25 HDTV 720P

8 1280*720 45.00 60.00 74.25 HDTV 720P

9 1280*720 44.96 59.94 74.176 HDTV 720P

10 1920*1080 28.125 50.00 74.25 HDTV 1080I

11 1920*1080 33.75 60.00 74.25 HDTV 1080I

12 1920*1080 33.72 59.94 74.176 HDTV 1080I

13 1920*1080 56.25 50.00 148.50 HDTV 1080P

14 1920*1080 67.50 60.00 148.50 HDTV 1080P

15 1920*1080 67.432 59.94 148.352 HDTV 1080P

16 1920*1080 27.00 24.00 74.25 HDTV 1080P

17 1920*1080 26.97 23.94 74.176 HDTV 1080P

18 1920*1080 33.75 30.00 74.25 HDTV 1080P

19 1920*1080 33.71 29.97 74.176 HDTV 1080P

5.2. RGB Input (PC) – LS35/LS34/CS46 series models are not supported.

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

1 640*350 31.468 70.09 25.17 EGA X

2 720*400 31.469 70.08 28.32 DOS O

3 640*480 31.469 59.94 25.17 VESA(VGA) O

4 800*600 37.879 60.31 40.00 VESA(SVGA) O

5 1024*768 48.363 60.00 65.00 VESA(XGA) O

6 1152*864 54.348 60.053 80.00 VESA O

7 1360*768 47.712 60.015 85.50 VESA (WXGA) O

8 1920*1080 67.5 60 148.5 HDTV 1080P O

Only for training and service purposes

- 8 -

5.3. HDMI Input(PC/DTV)

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

PC(DVI) DDC

1 640*350 31.468 70.09 25.17 EGA X

2 720*400 31.469 70.08 28.32 DOS O

3 640*480 31.469 59.94 25.17 VESA(VGA) O

4 800*600 37.879 60.31 40.00 VESA(SVGA) O

5 1024*768 48.363 60.00 65.00 VESA(XGA) O

6 1152*864 54.348 60.053 80.00 VESA O

7 1360*768 47.712 60.015 85.50 VESA (WXGA) O

8 1280*1024 63.981 60.020 108.0 VESA (SXGA) O FHD only

9 1920*1080 67.50 60.00 148.5 HDTV 1080P O FHD only

DTV

1 720*480 31.47 59.94 27.00 SDTV 480P

2 720*480 31.50 60.00 27.027 SDTV 480P

3 720*576 31.250 50.00 27.00 SDTV 576P

4 1280*720 37.50 50.00 74.25 HDTV 720P

5 1280*720 45.00 60.00 74.25 HDTV 720P

6 1280*720 44.96 59.94 74.176 HDTV 720P

7 1920*1080 28.125 50.00 74.25 HDTV 1080I

8 1920*1080 33.75 60.00 74.25 HDTV 1080I

9 1920*1080 33.72 59.94 74.176 HDTV 1080I

10 1920*1080 56.250 50.00 148.50 HDTV 1080P

11 1920*1080 67.50 60.00 148.50 HDTV 1080P

12 1920*1080 67.432 59.94 148.352 HDTV 1080P

13 1920*1080 27.00 24.00 74.25 HDTV 1080P

14 1920*1080 26.97 23.976 74.176 HDTV 1080P

15 1920*1080 33.75 30.00 74.25 HDTV 1080P

Only for training and service purposes

- 9 -

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied to all of the LCD TV with LD21A chassis.

2. Designation

(1) The adjustment is according to the order which is designated

and which must be followed, according to the plan

can be changed only on agreeing. (2) Power adjustment : Free Voltage. (3) Magnetic Field Condition: Nil. (4) Input signal Unit: Product Specification Standard. (5) Reserve after operation : Above 5 Minutes (Heat Run) Temperature : at 25 °C ± 5 °C Relative humidity : 65 ± 10 % Input voltage : 220 V, 60 Hz (6) Adjustment equipments: Color Analyzer(CA-210 or CA-110),

DDC Adjustment Jig, Service remote control. (7) Push the "IN STOP" key - For memory initialization.

Case1 : Software version up

1. After downloading S/W by USB , TV set will reboot automatically.

2. Push “In-stop” key.

3. Push “Power on” key.

4. Function inspection

5. After function inspection, Push “In-stop” key.

Case2 : Function check at the assembly line

1. When TV set is entering on the assembly line, Push “In-stop” key at rst.

2. Push “Power on” key for turning it on.

→ If you push “Power on” key, TV set will recover

channel information by itself.

3. After function inspection, Push “In-stop” key.

3. Main PCB check process

▪ APC - After Manual-Insert, executing APC

* Boot file Download

(1) Execute ISP program "Mstar ISP Utility" and then click

"Config" tab.

(2) Set as below, and then click "Auto Detect" and check "OK"

message. If "Error" is displayed, check connection between computer, jig, and set.

(3) Click "Read" tab, and then load download file(XXXX.bin)

by clicking "Read"

(1)

filexxx.bin

which

(4) Click "Connect" tab. If "Can't" is displayed, check connection

between computer, jig, and set.

(2)

(3)

Please Check the Speed : To use speed between from 200KHz to 400KHz

(5) Click "Auto" tab and set as below. (6) Click "Run". (7) After downloading, check "OK" message.

(4)

filexxx.bin

(5)

(7)...........OK

(6)

* USB DOWNLOAD

(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 Low, it didn't work. But your downloaded version is High, USB data is automatically detecting.

(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.

Only for training and service purposes

* After downloading, have to adjust Tool Option again.

- 10 -

(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)

3.1. ADC Process

(1) ADC

- Enter Service Mode by pushing "ADJ" key,

- Enter Internal ADC mode by pushing "►" key at "7. ADC Calibration".

0. Tool Option1

1. Tool Option2

2

. Tool Option3

. Tool Option4

3

4

. Tool Option 5

. Country Group

5

6. Area Option

7

. ADC Calibration ඖ

8. White Balance

9

. 10 Point WB

10

. Test Pattern

1

1. EDID D/L

2. Sub B/C

1

3. Touch Sensitivity Setting

1

EZ ADJUST

<Caution> Using "power on" key of the Adjustment remote

control, power on TV.

* ADC Calibration Protocol (RS232)

NO Item CMD 1 CMD 2 Data 0

Enter Adjust MODE

ADC adjust ADC Adjust A D 1 0

Adjust ‘Mode In’

A A 0 0

ADC Calibration

ADC Comp 480i NG

ADC Comp 1080p NG

ADC RGB NG

Start Reset

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

Automatically adjustment (The use of a internal pattern)

3.3. EDID data

(1) HD RGB EDID data (RGB input : only LD21B support)

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 a b 10 c 01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 81 C0 61 40 45 40 31 40 01 01 30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88 40 35 00 A0 5A 00 00 0 0 1C 01 1D 00 72 51 D0 1E 20 50 6E 28 55 0 0 A0 5A 0 0 00 00 1E 00 00 00 FD 00 3A 60 3 E 1F 46 10 00 0A 20 20 20 2 0 20 20 d 70 d 00 e

(2) HD HDMI EDID data

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 a b 10 c 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 01 01 30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70 40 36 00 40 84 63 00 00 1E 64 19 00 40 41 00 26 30 50 18 88 03 06 40 84 63 00 00 18 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 d 70 d 01 e 80 02 03 22 F1 4E 10 1F 84 13 05 14 03 02 12 20 21 90 22 15 01 26 15 07 50 09 57 07 f A0 80 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 A0 5A B0 00 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 C0 20 C2 31 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E D0 96 00 A0 5A 00 00 00 18 02 3A 80 18 71 38 2D 40 E0 58 2C 45 00 A0 5A 00 00 00 1E 00 00 00 00 00 00 F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e

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)] (only LD21B) ▪ ad 00 10 [Adjust 1024*768 RGB] (only LD21B) ▪ aa 00 90 End Adjust mode * Required equipment : Adjustment remote control.

3.2. EDID Download

▪ After enter Service Mode by pushing "ADJ" key. ▪ Enter EDID D/L menu. ▪ Enter "START" by pushing "OK" key. <Caution> Never connect HDMI && D-sub cable when EDID

downloaded.

0. Tool Option1

1. Tool Option2

2

. Tool Option3

. Tool Option4

3

4

. Tool Option 5

. Country Group

5

6. Area Option

7. ADC Calibration

8. White Balance

9

. 10 Point WB

10

. Test Pattern

1

1. EDID D/L

2. Sub B/C

1

3. Touch Sensitivity Setting

1

EZ ADJUST

ඖ

EDID D/L

HDMI1

HDMI2

HDMI3

RGB

Start Reset

NG

(3) Detail EDID Options are below

a. Product ID

MODEL NAME HEX EDID Table DDC Function

HD/FHD Model 0001 01 00 Analog/Digital

b. Serial No: Controlled on production line. c. Month, Year: Controlled on production line:

ex) Week : '01' -> '01'

Year : '2012' -> '16' fix

d. Model Name(Hex):

cf) TV set’s model name in EDID data is below.

Model name MODEL NAME(HEX)

LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV)

e. Checksum: Changeable by total EDID data.

EDID C/S data

Check sum

(Hex)

Block 0 A4 N/A

Block 1

5B (HDMI1) 4B (HDMI2)

HD

HDMI RGB

N/A

f. Vendor Specific(HDMI)

Input Model name(HEX)

HDMI1 67030C001000

HDMI2 67030C002000

HDMI3 67030C003000

Only for training and service purposes

- 11 -

3.4 Function Check

- Check display and sound

■ Check Input and Signal items.

1) TV

2) AV (SCART / CVBS)

3) COMPONENT (480i)

4) RGB (PC : 1024 x 768 @ 60hz) (* RGB input : LD21B only support)

5) HDMI

6) PC Audio In (* except LD21A chassis model)

* Display and Sound check is executed by Remote control.

* Connecting picture of the measuring instrument

(On Automatic control) Inside PATTERN is used when W/B is controlled. Connect to auto controller or push Adjustment R/C POWER ON -> Enter the mode of White-Balance, the pattern will come out.

Full White Pattern

CA-210

COLOR ANALYZER TYPE : CA-210

<Caution> Not to push the INSTOP key after completion if the function inspection.

4. Total Assembly line process

4.1. Adjustment Preparation

▪ W/B Equipment condition

CA210 : CCFL/EEFL -> CH9, Test signal: Inner pattern(80IRE) LED -> CH14, Test signal: Inner pattern(80IRE)

▪ If it is executed W/B adjustment in 2~3 minutes H/run, it is

adjusted by Target data

Mode Temp Coordinate spec Target

Cool 9,300 K

Medium 8,000 K

Warm 6,500 K

X=0.285 (±0.002) Y=0.293 (±0.002)

X=0.295 (±0.002) Y=0.305 (±0.002)

X=0.313 (±0.002) Y=0.329 (±0.002)

▪ Edge LED W/B Table in process of time (LGD module & 65”

AUO module)

Aging

GP4

time

(Min)

1 0-2 280 287 296 307 320 337 2 3-5 279 285 295 305 319 335 3 6-9 277 284 293 304 317 334 4 10-19 276 283 292 303 316 333 5 20-35 274 280 290 300 314 330 6 36-49 272 277 288 297 312 327 7 50-79 271 275 287 295 311 325 8 80-119 270 274 286 294 310 324 9 Over 120 269 273 285 293 309 323

Cool Medium Warm

X y x y x y

269 273 285 293 313 329

X=0.287 Y=0.296

X=0.297 Y=0.308

X=0.315 Y=0.332

<Test Signal> Inner pattern (204gray, 80IRE)

RS-232C Communication

* Auto-control interface and directions

(1) Adjust in the place where the influx of light like floodlight

around is blocked. (illumination is less than 10 lux).

(2) Adhere closely the Color analyzer(CA210) to the module

less than 10 cm distance, keep it with the surface of the Module and Color analyzer's prove vertically.(80° ~ 100°).

(3) Aging time

- After aging start, keep the power on (no suspension of power supply) and heat-run over 5 minutes.

- Using 'no signal' or 'POWER ONLY' or the others, check the back light on.

▪ Auto adjustment Map(using RS-232C to USB cable)

RS-232C COMMAND [CMD ID DATA] Wb 00 00 White Balance Start Wb 00 ff White Balance End

RS-232C COMMAND [CMD ID DATA]

Cool Mid Warm Cool Mid Warm

R Gain jg Ja jd 00 172 192 192 192

G Gain jh Jb je 00 172 192 192 192

B Gain ji Jc jf 00 192 192 172 192

R Cut 64 64 64 128

G Cut 64 64 64 128

B Cut 64 64 64 128

MIN

Color Temperature : COOL, Medium, Warm. One of R Gain/G Gain/ B Gain should be kept on 0xC0, and adjust other two lower than C0.(When R/G/B Gain are all C0, it is the FULL Dynamic Range of Module)

CENTER

(DEFAULT)

MAX

Only for training and service purposes

- 12 -

* Manual W/B process using adjust Remote control.

▪ After enter Service Mode by pushing "ADJ" key, ▪ Enter White Balance by pushing "►" key at "8. White

Balance".

EZ ADJUST

0. Tool Option1

1. Tool Option2

2. Tool Option3

3. Tool Option4

4. Tool Option5

5. Country Group

6. Area Option

7. ADC Calibration

8. White Balance ►

9. 10 Point WB

10. Test Pattern

11. EDID D/L

12. Sub B/C

13. Touch Sensitivity Setting

* After you finished all adjustments, Press "In-start" key and

compare Tool option and Area option value with its BOM, if it is correctly same then unplug the AC cable. If it is not same, then correct it same with BOM and unplug AC cable. For correct it to the model's module from factory Jig model.

* Push the "IN STOP" key after completing the function

inspection. And Mechanical Power Switch must be set “ON”.

White Balance

Color Temp.

R-Gain G-Gain B-Gain R-Cut G-Cut B-Cut Test-Pattern Backlight Reset

Cool

172 172 192

64 64

64 ON 100

To Set

5. HI-POT Test

5.1. HI-POT auto-check preparation

- Check the POWER cable and SIGNAL cable insertion condition

5.2. 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) HI-POT test (Auto)

- If Test is failed, Buzzer operates.

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

5.3. Checkpoint

(1) Test voltage

- Touchable Metal : 3KV / min at 100mA

- SIGNAL : 3KV / min at 100mA (2) TEST time: 1 second. (case : mass production ) (3) TEST POINT

- Touchable Metal => LIVE & NEUTRAL : Touchable Metal.

- SIGNAL => LIVE & NEUTRAL : SIGNAL.

4.2. EYE-Q function check

(1) Turn on TV. (2) Press EYE key of Adjustment remote control. (3) Cover the Eye Q II sensor on the front of the using your

hand and wait for 6 seconds.

(4) Confirm that R/G/B value is lower than 10 of the "Raw

Data (Sensor data, Back light)". If after 6 seconds, R/G/B

6. Model name & Serial number D/L

▪ Press "Power on" key of service remote control.

(Baud rate : 115200 bps) ▪ Connect USB to RS232 Signal Cable to USB Jack. ▪ Write Serial number. ▪ Must check the serial number at the Diagnostics of SET UP menu. (Refer to below.)

value is not lower than 10, replace Eye Q II sensor.

(5) Remove your hand from the Eye Q II sensor and wait for 6

seconds.

(6) Confirm that "ok" pop up. If change is not seen, replace

6.1. Signal Table

CMD LENGTH ADH ADL DATA_1 . . . Data_n CS DELAY

CMD : A0h LENGTH : 85~94h (1~16 bytes) ADH : EEPROM Sub Address high (00~1F) ADL : EEPROM Sub Address low (00~FF)

Eye Q II sensor.

4.3. Outgoing condition Configuration

■ When pressing IN-STOP key by SVC remocon, Red LED are blinked alternatively. And then automatically turn off.

(Must not AC power OFF during blinking)

Data : Write data CS : CMD + LENGTH + ADH + ADL + Data_1 +...+ Data_n Delay : 20ms

6.2. Comand Set

Adjust mode CMD(hex) LENGTH(hex) Description

EEPROM WRITE A0h 84h+n n-bytes Write (n = 1~16)

* Description

FOS Default write : <7mode data> write Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0, Phase Data write : Model Name and Serial Number write in EEPROM,.

- 13 -

Only for training and service purposes

6.3. Method & notice

(1) Serial number D/L is using of scan equipment. (2) Sett ing of scan equ ipm ent operated by Manufac turing

Technology Group.

(3) Serial number D/L must be conformed when it is produced in

production line, because serial number D/L is mandatory by D-book 4.0.

7. MAC Address & CI+ key download

7.1 MAC Address

7.1.1 Equipment & Condition

▪ Play file : Serial.exe ▪ MAC Address edit ▪ Input Start / End MAC address

* Manual Download(Model Name and Serial Number)

If the TV set is downloaded by OTA or Service man, sometimes model name or serial number is initialized.(Not always) There is impossible to download by bar code scan, so It need Manual download.

1) Press the "Instart" key of Adjustment remote control.

2) Go to the menu "6.Model Number D/L" like below photo.

3) Input the Factory model name or Serial number like photo.

4) Check the model name Instart menu. → Factory name displayed. (ex 32LV3400-ZG)

5) Check the Diagnostics.(DTV country only) → Buyer model displayed.(ex 32LV3400-ZG)

7.1.2 Download method

(1) Communication Prot connection

Connection : PCBA (USB Port) → USB to Serial Adapter (UC-232A) → RS-232C cable → PC(RS-232C port) * Caution : LJ21* chassis support only UC-232A driver. (only

use this one. )

(2) MAC Address & CI+ Key Download

▪ Set CI+ Key path Directory at Start Mac & CI+ Download

Programme

▪ Com 1,2,3,4 and 115200(Baudrate)

GP4_LOW

Only for training and service purposes

- 14 -

▪ Port connection button click(1) ▪ Push the (2) MAC Address write. ▪ At success Download, check the OK (3) ▪ Start CI+ Key Download, Push the (4) ▪ Check the OK or NG

7.2 LAN Inspection

7.2.1. Equipment & Condition

▪ Each other connection to LAN Port of IP Hub and Jig

7.2.1. LAN inspection solution

▪ LAN Port connection with PCB ▪ Network setting at MENU Mode of TV ▪ Setting automatic IP ▪ Setting state confirmation

-> If automatic setting is finished, you confirm IP and MAC

Address.

7.3. LAN PORT INSPECTION(PING TEST)

Connect SET -> LAN port == PC -> LAN Port

SET PC

7.3.1. Equipment setting

(1) Play the LAN Port Test PROGRAM. (2) Input IP set up for an inspection to Test Program.

*IP Number : 12.12.2.2

7.3.2. LAN PORT inspection (PING TEST)

(1) Play the LAN Port Test Program. (2) Connect each other LAN Port Jack. (3) Play Test (F9) button and confirm OK Message. (4) Remove LAN cable.

Only for training and service purposes

- 15 -

DISASSEMBLY

2

1

3

[Caution] Please unlock latches from Bottom Side, for separating Back Cover from CABINET

[Method] Firstly, Grab left side of Speaker Vent Hole(①) and then unlock left side latches(②) slowly. Secondly, Grab center(③) of Back Cover and then separate Back Cover slowly.

Only for training and service purposes

- 16 -

BLOCK DIAGRAM

Side

FFC(HD 30P)

CI Slot

SPK L/R

IC1902 Buffer

TC74LCX244FT

SERIAL FLASH

IC104 ( 256Kbit)

IC1201

LVDS

(HD 50Hz)

SERIAL FLASH

IC1401 (8Mbit)

SPI

DDR3 (1Gbit)

4B1G1646G BCK0

MX25L8006EM2I -12G

K

DDR3 Add.

DDR3 Data

R1EX2425BSAS0A

NAND FLASH

IC102 (1Gbit)

9F1G08U0D- SCB0 K

I2C

PCM_A[8:14]

PCM_A[0:7]

IC101

LG2111 A

TS_DATA[0:7]

PCM_DATA[0:7]

FE_TS_DATA[0:7]

CONTROL

IR & LED /

SOFT TOUCH

(TACT SWITCH)

KEY2

KEY1

_SCL/SDA

SENSOR &

SOFT TOUCH

IR

LED_R

STA380BW

Audio AMP

I2S

X201

X- tal 24M

IF +/ -

TU_CVBS

ATV :

SI2176

Only for training and service purposes

DP/DM

TMDS

CVBS, Y/Pb/Pr, L/R

SIF

FE_ VOUT

SC1_R/G/B

SC1_CVBS_IN

TP/TN/RP/RN

USB1(2.0)

FULL SCART

Side

HDMI1/2(DVI)

Component/AV

COMMON

ETHERNET(T2 Only)

Rear

- 17 -

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

910

410

900

521

LV1

540

820

A10

* Set + Stand

A5

200

A31

120

A21

310

A2

300

Only for training and service purposes

- 18 -

510

Contents of LCD TV Standard Repair Process

LGE Internal Use Only

No. Error symptom (High category) Error symptom (Mid category) Page Remarks

1

2 No video/No audio 2

3 Tuning fail, Picture broken/ Freezing 3, 4

4 Color error 5

5

6

7

8

9 Wrecked audio/discontinuation/noise 10

10

11 External device recognition error 12

12 E. Noise Circuit noise, mechanical noise 13

A. Video error

B. Power error

C. Audio error

D. Function error

No video/Normal audio 1

Vertical/Horizontal bar, residual image, light spot, external device color error

No power 7

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

No audio/Normal video 9

Remote control & Local switch checking 11

6

8

13 F. Exterior error Exterior defect 14

First of all, Check whether there is SVC Bulletin in GCSC System for these model.

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+ 24V 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

A. Video error_Color error

10

11 Adjustment Test pattern - ADJ Key A10

12

A. Video error_Vertical/Horizontal bar,

13

residual image, light spot

14 Adjustment Test pattern - ADJ Key A10

15

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

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

A8 A9

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

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

Defected Type caused by T-Con/ Inverter/ Module

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

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

55” : driver board

Other : PSU

Continue to the next page

Standard Repair Process

LGE Internal Use Only

Established

date

Revised date

2012. 01 .14

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

No video Normal audio

Normal

audio

N

Move to No video/No audio

Y

Check Back Light On with naked eye

☞A2

Check Power Board 24v output

On

Normal voltage

Repair Power Board or parts

Y

Check Power Board 12v,3.5v etc.

N

Replace Inverter

Y

or module

N

Normal

voltage

Repair Power Board or parts

N

End

Y

Replace T-con Board or module

1/14

※Precaution

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

☞A6 & A3

Replace Main Board

Re-enter White Balance value

Standard Repair Process

LGE Internal Use Only

LCD TV

symptom

No Video/ No audio

Error

☞A4

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

A. Video error

No video/ No audio

Normal

voltage?

Replace Power Board and repair parts

Y

N

Check and replace MAIN B/D

Established

date

Revised date

End

2012 . 01 .14

2/14

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

A. Video error

Picture broken/ Freezing

. By using Digital signal level meter . By using Diagnostics menu on OSD

( Menu→ Set up→ Support → Signal Test )

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

☞ A6

Normal

Picture?

Contact with signal distributor

or broadcaster (Cable or Air)

Y

N

Check

S/W Version

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

Established

date

Revised date

N

Tuner soldering

N

Check

2012. 01 .14

Normal

Picture?

Replace

Main B/D

3/14

Y

Close

N

Close

Y

Close

Standard Repair Process

LGE Internal Use Only

LCD TV

☞ A5

Check RF Signal level

Normal Signal?

Contact with

signal distributor

or broadcaster

(Cable or Air)

Y

N

Error

symptom

Tuning fail, Picture broken/ Free zing

Check RF signal cable (DVB satellite signal or not)

Check whether other equipments have problem or not. (By connecting RF Cable at other equipment)

→ Set-Top-Box, Different maker TV etc

Check satellite setting.

- Check LNB frequency.

- Check satellite

- Check Satellite connection

(DiSEqC, motor, etc…)

A. Video error

Normal

setting?

N

Change satellite setting

(match with installed ANT)

Y

☞ A6

Check

S/W Version

Established

date

Revised date

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

2012. 01 .14

N

Tuner soldering

N

Check

4/14

Replace

Main B/D

Close

Normal

Picture?

Y

Close

Y

N

Close

Standard Repair Process

LGE Internal Use Only

LCD TV

☞A7

Check color by input

-External Input

-COMPONENT

-RGB

-HDMI/DVI

☞A10

Check Test pattern

Error

symptom

Color

error?

N

Check error color input mode

A. Video error

☞ A8/ A9

※ Check

and replace

Y

Link Cable (LVDS) and contact condition

External Input/

Component

error

Color 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

2012. 01 .14 5/14

Y

Replace module

N

Replace Main B/D

RGB/

HDMI/DVI

error

Check external device and cable

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

-External Input

-Component

-RGB

-HDMI/DVI

☞A10

Check Test pattern

Screen

normal?

N

Replace module

Check external

Y

device connection condition

Normal?

N

Request repair for external device

External device screen error-Color error

Check screen condition by

Check S/W Version

Check

version

Y

S/W Upgrade

Normal

screen?

Y

End

N

input

-External Input

-Component

-RGB

-HDMI/DVI

☞ A8/ A9

Check and

Y

replace Link Cable

External

Input error

Component

error

RGB

error

HDMI/

DVI

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, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

Connect other external device and cable

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

2012. 01 .14

Screen

normal?

Request repair for external device

Screen

normal?

6/14

Replace Module

N

Screen

normal?

Y

End

N

Replace Main B/D

Y

N

Replace Main B/D

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

N

Normal?

Y

※

Close

Y

Check ST-BY 3.5V

☞A12

B. Power error

No power

DC Power on by pressing Power Key On Remote control

Normal

voltage?

Established

date

Revised date

2012. 01 .14 7/14

☞A13

Normal

operation?

Y

N

Check Power On ‘”High”

OK?

N

Replace Main B/D

Y

Replace Power B/D

☞A4

Measure voltage of each output of Power B/D

Y

N

Normal

voltage?

Replace Power B/D

Y

N

Replace Main B/D

Replace Power B/D

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

Abnormal

Established

date

Revised date

CPU

1

Normal

voltage?

Replace Power B/D

Y

N

2012. 01 .14

Replace Main B/D

8/14

Normal?

Replace Power B/D

Y

N

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 "POWEROFF_AUTOOFF" Power off by AUTO OFF

Normal

Abnormal

"POWEROFF_ONTIMER" Power off by ON TIMER "POWEROFF_RS232C" Power off by RS232C "POWEROFF_RESREC" Power off by Reserved Record "POWEROFF_RECEND" Power off by End of Recording "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

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+

N

24V of Power Board

Established

date

Revised date

Normal voltage

Replace Power Board and repair parts

Y

N

2012. 01 .14 9/14

Check Speaker disconnection

Disconnection

Y

Replace Speaker

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

2012. 01 .14

→ 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 D-TV

Wrecked audio/

Discontinuation/

Noise only

for Analog

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

Y

10/14

End

Check and fix external device

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.

operating?

Normal

Y

N

Check & Replace

Baterry of R/C

Normal

operating?

Replace R/C

Check & Repair Cable connection Connector solder

Close

N

D. Function error

☞A17

Normal

operating?

Close

N

Y

Check B+

3.5V

On Main B/D

☞A4

Check 3.5v on Power B/D

(Power B/D don’t have problem)

Established

date

Revised date

Normal

Voltage?

Replace Power B/D or

Replace Main B/D

Y

N

2012. 01 .14

☞A17

Check IR

Output signal

11/14

Replace

Main B/D

Normal

Signal?

N

Repair/Replace

IR B/D

Y

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

Technical

information?

Fix in

accordance

with technical

information

Established

date

Revised date

External Input and

N

Y

Component

Recognition error

RGB,HDMI/ DVI, Optical

Recognition error

2012. 01 .14 12/14

Replace Main B/D

Standard Repair Process

LGE Internal Use Only

LCD TV

Identify nose type

Error

symptom

Circuit

noise

Mechanical

noise

Circuit noise, mechanica l 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.

Replace PSU (with LED driver)

OR

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

Established

date

Revised date

2012. 01 .14 13/14

Standard Repair Process

LGE Internal Use Only

LCD TV

Error

symptom

Zoom part with exterior damage

Module

damage

Cabinet damage

Remote

controller

damage

F. Exterior defect

Exterior defect

Replace module

Replace cabinet

Replace remote controller

Established

date

Revised date

2012. 01 .14 14/14

Stand

dent

Replace stand

Contents of LCD TV Standard Repair Process

LGE Internal Use Only

No. Error symptom (High category) Error symptom (Mid category) Page Remarks

1

2 No video/No audio 2

3 Tuning fail, Picture broken/ Freezing 3, 4

4 Color error 5

5

6

7

8

9 Wrecked audio/discontinuation/noise 10

10

11 External device recognition error 12

12 E. Noise Circuit noise, mechanical noise 13

A. Video error

B. Power error

C. Audio error

D. Function error

No video/Normal audio 1

Vertical/Horizontal bar, residual image, light spot, external device color error

No power 7

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

No audio/Normal video 9

Remote control & Local switch checking 11

6

8

13 F. Exterior error Exterior defect 14

First of all, Check whether there is SVC Bulletin in GCSC System for these model.

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+ 24V 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

A. Video error_Color error

10

11 Adjustment Test pattern - ADJ Key A10

12

A. Video error_Vertical/Horizontal bar,

13

residual image, light spot

14 Adjustment Test pattern - ADJ Key A10

15

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

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

A8 A9

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

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

Defected Type caused by T-Con/ Inverter/ Module

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

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

55” : driver board

Other : PSU

Continue to the next page

Standard Repair Process

LGE Internal Use Only

Established

date

Revised date

2012. 01 .14

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

No video Normal audio

Normal

audio

N

Move to No video/No audio

Y

Check Back Light On with naked eye

☞A2

Check Power Board 24v output

On

Normal voltage

Repair Power Board or parts

Y

Check Power Board 12v,3.5v etc.

N

Replace Inverter

Y

or module

N

Normal

voltage

Repair Power Board or parts

N

End

Y

Replace T-con Board or module

1/14

※Precaution

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

☞A6 & A3

Replace Main Board

Re-enter White Balance value

Standard Repair Process

LGE Internal Use Only

LCD TV

symptom

No Video/ No audio

Error

☞A4

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

A. Video error

No video/ No audio

Normal

voltage?

Replace Power Board and repair parts

Y

N

Check and replace MAIN B/D

Established

date

Revised date

End

2012 . 01 .14

2/14

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

A. Video error

Picture broken/ Freezing

. By using Digital signal level meter . By using Diagnostics menu on OSD

( Menu→ Set up→ Support → Signal Test )

- Signal strength (Normal : over 50%)

- Signal Quality (Normal: over 50%)

Check whether other equipments have problem or not.

(By connecting RF Cable at other equipment)

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

☞ A6

Normal

Picture?

Contact with signal distributor

or broadcaster (Cable or Air)

Y

N

Check

S/W Version

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

Established

date

Revised date

N

Tuner soldering

N

Check

2012. 01 .14

Normal

Picture?

Replace

Main B/D

3/14

Y

Close

N

Close

Y

Close

Standard Repair Process

LGE Internal Use Only

LCD TV

☞ A5

Check RF Signal level

Normal Signal?

Contact with

signal distributor

or broadcaster

(Cable or Air)

Y

N

Error

symptom

Tuning fail, Picture broken/ Free zing

Check RF signal cable (DVB satellite signal or not)

Check whether other equipments have problem or not. (By connecting RF Cable at other equipment)

→ Set-Top-Box, Different maker TV etc

Check satellite setting.

- Check LNB frequency.

- Check satellite

- Check Satellite connection

(DiSEqC, motor, etc…)

A. Video error

Normal

setting?

N

Change satellite setting

(match with installed ANT)

Y

☞ A6

Check

S/W Version

Established

date

Revised date

SVC

Bulletin?

Y

S/W Upgrade

Normal

Picture?

2012. 01 .14

N

Tuner soldering

N

Check

4/14

Replace

Main B/D

Close

Normal

Picture?

Y

Close

Y

N

Close

Standard Repair Process

LGE Internal Use Only

LCD TV

☞A7

Check color by input

-External Input

-COMPONENT

-RGB

-HDMI/DVI

☞A10

Check Test pattern

Error

symptom

Color

error?

N

Check error color input mode

A. Video error

☞ A8/ A9

※ Check

and replace

Y

Link Cable (LVDS) and contact condition

External Input/

Component

error

Color 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

2012. 01 .14

5/14

Y

Replace module

N

Replace Main B/D

RGB/

HDMI/DVI

error

Check external device and cable

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

-External Input

-Component

-RGB

-HDMI/DVI

☞A10

Check Test pattern

Screen

normal?

N

Replace module

Check external

Y

device connection condition

Normal?

N

Request repair for external device

External device screen error-Color error

Check screen condition by

Check S/W Version

Check

version

Y

S/W Upgrade

Normal

screen?

Y

End

N

input

-External Input

-Component

-RGB

-HDMI/DVI

☞ A8/ A9

Check and

Y

replace Link Cable

External

Input error

Component

error

RGB

error

HDMI/

DVI

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, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc.

Connect other external device and cable

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

2012. 01 .14

Screen

normal?

Request repair for external device

Screen

normal?

6/14

Replace Module

N

Screen

normal?

Y

End

N

Replace Main B/D

Y

N

Replace Main B/D

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

N

Normal?

Y

※

Close

Y

Check ST-BY 3.5V

☞A12

B. Power error

No power

DC Power on by pressing Power Key On Remote control

Normal

voltage?

Established

date

Revised date

2012. 01 .14

7/14

☞A13

Normal

operation?

Y

N

Check Power On ‘”High”

OK?

N

Replace Main B/D

Y

Replace Power B/D

☞A4

Measure voltage of each output of Power B/D

Y

N

Normal

voltage?

Replace Power B/D

Y

N

Replace Main B/D

Replace Power B/D

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

Abnormal

Established

date

Revised date

CPU

1

Normal

voltage?

Replace Power B/D

Y

N

2012. 01 .14

Replace Main B/D

8/14

Normal?

Replace Power B/D

Y

N

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 "POWEROFF_AUTOOFF" Power off by AUTO OFF

Normal

Abnormal

"POWEROFF_ONTIMER" Power off by ON TIMER "POWEROFF_RS232C" Power off by RS232C "POWEROFF_RESREC" Power off by Reserved Record "POWEROFF_RECEND" Power off by End of Recording "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

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+

N

24V of Power Board

Established

date

Revised date

Normal voltage

Replace Power Board and repair parts

Y

N

2012. 01 .14

9/14

Check Speaker disconnection

Disconnection

Y

Replace Speaker

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

2012. 01 .14

→ 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 D-TV

Wrecked audio/

Discontinuation/

Noise only

for Analog

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

Y

10/14

End

Check and fix external device

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.

operating?

Normal

Y

N

Check & Replace

Baterry of R/C

Normal

operating?

Replace R/C

Check & Repair Cable connection Connector solder

Close

N

D. Function error

☞A17

Normal

operating?

Close

N

Y

Check B+

3.5V

On Main B/D

☞A4

Check 3.5v on Power B/D

(Power B/D don’t have problem)

Established

date

Revised date

Normal

Voltage?

Replace Power B/D or

Replace Main B/D

Y

N

2012. 01 .14

☞A17

Check IR

Output signal

11/14

Replace

Main B/D

Normal

Signal?

N

Repair/Replace

IR B/D

Y

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

Technical

information?

Fix in

accordance

with technical

information

Established

date

Revised date

External Input and

N

Y

Component

Recognition error

RGB,HDMI/ DVI, Optical

Recognition error

2012. 01 .14 12/14

Replace Main B/D

Standard Repair Process

LGE Internal Use Only

LCD TV

Identify nose type

Error

symptom

Circuit

noise

Mechanical

noise

Circuit noise, mechanica l 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.

Replace PSU (with LED driver)

OR

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

Established

date

Revised date

2012. 01 .14 13/14

Standard Repair Process

LGE Internal Use Only

LCD TV

Error

symptom

Zoom part with exterior damage

Module

damage

Cabinet damage

Remote

controller

damage

F. Exterior defect

Exterior defect

Replace module

Replace cabinet

Replace remote controller

Established

date

Revised date

2012. 01 .14 14/14

Stand

dent

Replace stand

LG 19LS350S, 19LS350T Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual