LG 42LH40ED, 42LH45ED Schematic

LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LJ92J

MODEL : 42LH40ED

42LH40ED-SA

42LH45ED

42LH45ED-SB

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

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

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

Internal Use Only

Printed in KoreaP/NO : MFL58893601 (0912-REV01)

Only for training and service purposes

- 2 -

CONTENTS

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

PRODUCT SAFETY ..................................................................................3

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

ADJUSTMENT INSTRUCTION ...............................................................14

TROUBLE SHOOTING............................................................................17

BLOCK DIAGRAM...................................................................................58

EXPLODED VIEW .................................................................................. 59

SVC. SHEET ...............................................................................................

Only for training and service purposes

- 3 -

SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the

Schematic Diagram and Exploded View.

It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent

Shock, Fire, or other Hazards.

Do not modify the original design without permission of manufacturer.

General Guidance

An isolation Transformer should always be used during the

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

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

protects the technician from accidents resulting in personal injury

from electrical shocks.

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

damaged by accidental shorts of the circuitry that may be

inadvertently introduced during the service operation.

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

replace it with the specified.

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

over 1W), keep the resistor 10mm 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 1MΩ and 5.2MΩ.

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

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

and the exposed metallic parts.

Measure the AC voltage across the resistor using AC voltmeter

with 1000 ohms/volt or more sensitivity.

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

measurements for each exposed metallic part. Any voltage

measured must not exceed 0.75 volt RMS which is corresponds to

0.5mA.

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

1.5 Kohm/10W

To Instrument’s

exposed

METALLIC PARTS

Good Earth Ground

such as WATER PIPE,

CONDUIT etc.

AC Volt-meter

When 25A is impressed between Earth and 2nd Ground

for 1 second, Resistance must be less than 0.1

*Base on Adjustment standard

IMPORTANT SAFETY NOTICE

0.15uF

Ω

Only for training and service purposes

- 4 -

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 conflict 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 specified 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 flammable mixture.

Unless specified 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 fixtures specified in this

service manual.

CAUTION: Do not connect the test fixture 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 field-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 classified as "anti-static" can generate

electrical charges sufficient to damage ES devices.

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

electrical charges sufficient 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 floor can generate static electricity

sufficient 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 wire-

bristle (0.5 inch, or 1.25cm) 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 flows 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.

SERVICING PRECAUTIONS

Only for training and service purposes

- 5 -

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through

which the IC leads are inserted and then bent flat 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.

Fuse and Conventional Resistor

Removal/Replacement

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

stake.

2. Securely crimp the leads of replacement component around

notch at stake top.

3. Solder the connections.

CAUTION: Maintain original spacing between the replaced

component and adjacent components and the circuit board to

prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit

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

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

following guidelines and procedures should be followed 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.

Only for training and service purposes

- 6 -

SPECIFICATION

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

4. Electrical specification

4.1 General Specification

1. Application range

This specification is applied to the LCD TV used LJ92J

chassis.

2. Requirement for Test

Each part is tested as below without special appointment.

1) Temperature : 25±5ºC (77±9ºF), CST : 40±5ºC

2) Relative Humidity : 65±10%

Power Voltage : Standard input voltage(100~240V@50/60Hz)

* Standard Voltage of each products is marked by models.

4) Specification and performance of each parts are followed

each drawing and specification by part number in

accordance with BOM.

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

the adjustment.

3. Test method

1) Performance: LGE TV test method followed

2) Demanded other specification

- Safety: UL, CSA, IEC specification, CE

- EMC: FCC, ICES, IEC specification, CE

No Item Specification Remark

Receiving System

1) SBTVD / NTSC / PAL-M / PAL-N

Available Channel 1) VHF : 02~13

2) UHF : 14~69

3) DTV : 02-69

4) CATV : 01~135

3. Input Voltage 1) AC 100 ~ 240V 50/60Hz Mark : 110V, 60Hz

4. Market Central and South AMERICA

Screen Size

42 inch Wide (1920 X 1080)

47 inch Wide (1920 X 1080)

42LH40ED-SA

47LH40ED-SA

6. Aspect Ratio 16:9

7. Tuning System FS

Module

LC420WUE-SBC1 (VITIAZ 4)

LC470WUE-SBB1 (VITIAZ4)

42LH40ED-SA

47LH40ED-SA

Operating Environment 1) Temp : 0 ~ 40 deg

2) Humidity : ~ 80 %

10.

Storage Environment 1) Temp : -20 ~ 60 deg

2) Humidity : ~ 85 %

- 7 -

Only for training and service purposes

5. Chromiance & Luminance spec.

No Item Min Typ Max Unit Remark

Module cd/m LC420WUE-SBC1 1. Max Luminance

(Center 1-point / Full White

Pattern)

Set

400 500

400 500 cd/m

Luminance uniformity 77 % Full white

0.638

0.334

RED

0.290

0.606

GREEN

0.144

0.064

BLUE

0.279

10.

Color

coordinate

WHITE

Typ.

-0.03

0.292

Typ.

+0.03

11. Color coordinate uniformity N/A

700:1 1000:1 NORMAL

Contrast ratio

7000:1 10000:1 DCR

Cool

0.281

0.274

0.276

0.283

0.278

0.285

Standard

0.291

0.283

0.311

0.285

0.293

0.287

0.295

12. Color

Temperature

Warm

0.327

0.313

0.329

0.315

0.331

85% Full white pattern

** The W/B Tolerance is

–0.015 for Adjustment

Dynamic contrast : off

Dynamic color : off

OPC : off

13. Color Distortion, DG 10.0 %

14. Color Distortion, DP 10.0 deg

15. Color S/N, AM/FM 43.0 dB

16. Color Killer Sensitivity -80 dBm

6. Component Input (Y, C

B/PB, CR/PR)

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

1. 720*480 15.73 60 13.5135 SDTV ,DVD 480I

2. 720*480 15.73 59.94 13.5 SDTV ,DVD 480I

3. 720*480 31.47 60 27.027 SDTV 480P

4. 720*480 31.47 59.94 27.0 SDTV 480P

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 33.75 60.00 74.25 HDTV 1080I

8. 1920*1080 33.72 59.94 74.176 HDTV 1080I

9. 1920*1080 67.500 60 148.50 HDTV 1080P

10. 1920*1080 67.432 59.939 148.352 HDTV 1080P

11. 1920*1080 27.000 24.000 74.25 HDTV 1080P

12. 1920*1080 26.97 23.94 74.176 HDTV 1080P

13. 1920*1080 33.75 30.000 74.25 HDTV 1080P

14. 1920*1080 33.71 29.97 74.176 HDTV 1080P

15. 1920*1080 56.25 50.000 148.5 HDTV 1080P

16. 1920*1080 28.125 25.000 74.25 HDTV 1080P

- 8 -

Only for training and service purposes

7. RGB Input (PC)

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

PC DDC

1. 640*350 31.468 70.09 25.17 EGA X

2. 720*400 31.469 70.08 28.32 DOS

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

4. 800*600 35.156 56.25 36.00 VESA(SVGA)

5. 800*600 37.879 60.31 40.00 VESA(SVGA)

6. 1024*768 48.363 60.00 65.00 VESA(XGA)

7. 1280*768 47.776 59.870 79.5 CVT(WXGA)

8. 1360*768 47.712 60.015 85.50 VESA (WXGA)

9. 1280*1024 63.981 60.020 108.00 VESA

10. 1600*1200 75.00 60.00 162 VESA (UXGA)

11 1920*1080 67.5 60 148.5 HDTV 1080P

** RGB PC Monitor Range Limits

- Min Vertical Freq - 56 Hz

- Max Vertical Freq - 62 Hz

- Min Horiz. Freq - 30 kHz

- Max Horiz. Freq - 80 kHz

- Pixel Clock - 170 MHz

8. HDMI Input (PC/DTV)

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

PC DDC

1 640*350 31.468 70.09 25.17 EGA X

2 720*400 31.469 70.08 28.32 DOS

3 640*480 31.469 59.94 25.17 VESA(VGA)

4 800*600 35.156 56.25 36.00 VESA(SVGA)

5 800*600 37.879 60.31 40.00 VESA(SVGA)

6 1024*768 48.363 60.00 65.00 VESA(XGA)

7 1280*768 47.776 59.870 79.5 CVT(WXGA)

8 1360*768 47.712 60.015 85.50 VESA (WXGA)

9 1280*1024 63.981 60.020 108.00 VESA (SXGA)

10 1600*1200 75.00 60.00 162 VESA (UXGA)

11 1920*1080 66.587 59.934 138.5 HDTV 1080P

DTV

1 720*480 31.47 60 27.027 SDTV 480P

2 720*480 31.47 59.94 27.00 SDTV 480P

3 1280*720 45.00 60.00 74.25 HDTV 720P

4 1280*720 44.96 59.94 74.176 HDTV 720P

5 1920*1080 33.75 60.00 74.25 HDTV 1080I

6 1920*1080 33.72 59.94 74.176 HDTV 1080I

7 1920*1080 67.500 60 148.50 HDTV 1080P

8 1920*1080 67.432 59.939 148.352 HDTV 1080P

9 1920*1080 27.000 24.000 74.25 HDTV 1080P

10 1920*1080 26.97 23.94 74.176 HDTV 1080P

11 1920*1080 33.75 30.000 74.25 HDTV 1080P

12 1920*1080 33.71 29.97 74.176 HDTV 1080P

17. 1920*1080 56.25 50.000 148.5 HDTV 1080P

18. 1920*1080 28.125 25.000 74.25 HDTV 1080P

** HDMI Monitor Range Limits

- Min Vertical Freq - 56 Hz

- Max Vertical Freq - 62 Hz

- Min Horiz. Freq - 30 kHz

- Max Horiz. Freq - 80 kHz

- Pixel Clock - 170 MHz

- 9 -

Only for training and service purposes

9. Consignment Setting (OUTGOING CONDITION)

10. Mechanical Specification

No Item Condition

1. Input Mode TV02CH

2. Volume Level 10

3. Mute Off

4. Aspect Ratio 16:9

5. System Color PAL-M

6 Booster On

Picture Mode Vivid

Backlight

Contrast

Brightness

Sharpness

Color 70

100

Tint

Color Temperature Cool

7. Picture

Picture Reset

Sound Mode Standard

Auto Volume Off

Clear Voice Off

SRS TruSurround XT Off

Balance

8. Audio

TV Speaker On

Clock Auto9. Time

Off Timer / On Timer

Sleep Timer / Auto Sleep

Off

Language (Menu/Audio) Portugues

SimpLink

Key Lock Off

Off

Caption

10. Option

Set ID 1

11. Channel Memory RF : 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,

14, 30, 51, 63

CATV : 15, 16, 17

No. Item Content Unit Remark

Width (W) Length (D) Height (H) mm

721.31036 296.2

1036 89.8

1330 228

With Stand

Before Packing

655.4 mm

Without Stand

Product

Dimension

After Packing

770 mm

With Stand

19.5kg With Stand

Only SET

17.7Kg Without Stand

Product

Weight

With BOX 24.0kg Kg

With Stand

40ft

40ft(H-CUBIC)

Indi. Woo den Indi. Wooden

Container

Quantity

Individual or Palletizing

270 -

4. Stand Assy

Swivel Degree

Swivel Force

Swivel(+/- 20degree)

1.5 Kgf(0.8Kgf ~ 2.5Kgf)

5. Appearance

General

Refer to Standard of LG(56)G4-9002

Only for training and service purposes

- 10 -

ADJUSTMENT INSTRUCTION

1. Application Range

This specification sheet is applied all of the LJ91D, LJ92J

LCD TV models, which produced in manufacture department

or similar LG TV factory.

2. Notice

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. But it is

flexible when its factory local problem occurs. .

3) The adjustment must be performed in the circumstance of

25 ±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 100~220V,

50/60Hz.

5) Before adjustment, execute Heat-Run for 5 minutes.

• After Receive 100% Full white pattern (06CH) then process

Heat-run

(or “8. Test pattern” condition of Ez-Adjust status)

• How to make set white pattern

1) Press Power ON button of Service Remocon

2) Press ADJ button of Service remocon. Select “8. Test

pattern” and, after select “White” using navigation button,

and then you can see 100% Full White pattern.

* In this status you can maintain Heat-Run useless any

pattern generator

* Notice: if you maintain one picture over 20 minutes

(Especially sharp distinction black with white pattern –

13Ch, or Cross hatch pattern – 09Ch) then it can appear

image stick near black level.

3. Adjustment Items

3.1 PCB Assembly adjustment

• CPLD DOWNLOAD

• Adjust 480i Comp1

• Adjust 1080p Comp1/RGB

- If it is necessary, it can adjustment at Manufacture Line

- You can see set adjustment status at “1. ADJUST

CHECK” of the “In-start menu”

3.2 Set Assembly Adjustment

• EDID (The Extended Display Identification Data ) / DDC

(Display Data Channel) download

• Color Temperature (White Balance) Adjustment

• Make sure RS-232C control

• Selection Factory output option

4. PCB Assembly Adjustment

4.1. CPLD DOWNLOAD : JTAG MODE

4.2. << PRINT PORT >> PIN MAP

Pin JTAG Mode Signal Name

2 TCK

3 TMS

8 TDI

11 TDO

13 -

15 VCC

18 TO 25 GND

- 11 -

Only for training and service purposes

4.3. << 10P WAFER >> PIN MAP

- 12 -

Only for training and service purposes

4.4. Using RS-232C

Adjust 3 items at 3.1 PCB assembly adjustments “4.1.3

sequence” one after the order.

O Adjustment protocol

See ADC Adjustment RS232C Protocol_Ver1.0

O Adjustment protocol

- Pattern Generator : (MSPG-925FA)

- Adjust 480i Comp1 (MSPG-925FA : model :209 , pattern

: 65)

- Adjust 1080p Comp1/RGB(MSPG-925FA:model : 225 ,

pattern : 65)

- Adjust RGB (MSPG-925FA:model :225 , Pattern :65) –

RGB-PC Mode

* If you want more information then see the below Adjustment

method (Factory Adjustment)

O Adjustment sequence

- ad 00 00 : Enter the ADC Adjustment mode.

- xb 00 40: Change the mode to Component1 (No actions)

- ad 00 10: Adjust 480i Comp

- ad 00 10: Adjust 1080p Comp

- xb 00 60: Change to RGB-PC mode(No action)

- ad 00 10: Adjust 1080p RGB

- ad 00 90: End of the adjustment

Order

Command

Set response

1. Inter the ad 00 00 d 00 OK00x

Adjustment mode

2. Change the kb 00 40

b 00 OK40x (Adjust 480i Comp1/1080p Comp1)

Source kb 00 60

b 00 OK60x (Adjust 1080p RGB)

Start Adjustment

ad 00 10

4.Return the OKx ( Success condition )

Response NGx ( Failed condition )

5.Read (main)

(main : component1 480i, RGB 1080p)

Adjustment data

ad 00 20

000000000000000000000000007c007b006dx

(main) (main : component1 1080p)

ad 00 30

000000070000000000000000007c00830077x

6.Confirm ad 00 99 NG 03 00x (Failed condition)

Adjustment NG 03 01x (Failed condition)

NG 03 02x (Failed condition)

OK 03 03x (Success condition)

End of Adjustment

ad 00 90 d 00 OK90x

Only for training and service purposes

- 13 -

5. Factory Adjustment

5.1 Manual Adjust Component 480i/1080p

RGB 1080p

O Summary : Adjustment component 480i/1080i and RGB

1080p is Gain and Black levelsetting at Analog

to Digital converter, and compensate the RGB

deviation

O Using instrument

- Adjustment remocon, 801GF(802B, 802F, 802R) or

MSPG925FA pattern generator (It can output 480i/1080i

horizontal 100% color bar pattern signal, and its output

level must setting 0.7V±0.1V p-p correctly)

<Pic.4 Adjustment pattern : 480i / 1080p 60Hz Pattern >

* You must make it sure its resolution and pattern cause every

instrument can have different setting

O Adjustment method 480i Comp1, Adjust 1080p

Comp1/RGB (Factory adjustment)

• ADC 480i Component1 adjustment

- Check connection of Component1

- MSPG-925FA Ë Model: 209, Pattern 65

• Set Component 480i mode and 100% Horizontal Color

Bar Pattern(HozTV31Bar), then set TV set to

Component1 mode and its screen to “NORMAL”

• ADC 1080p Component1 / RGB adjustment

- Check connection both of Component1 and RGB

- MSPG-925FA Model: 225, Pattern 65

• Set Component 1080p mode and 100% Horizontal Color

Bar Pattern(HozTV31Bar), then set TV set to

Component1 mode and its screen to “NORMAL”

• After get each the signal, wait more a second and enter

the “IN-START” with press IN-START key of Service

remocon. After then select “7. External ADC” with

navigator button and press “Enter”.

• After Then Press key of Service remocon “Right

Arrow(VOL+)”

• You can see “ADC Component1 Success”

• Component1 1080p, RGB 1080p Adjust is same

method.

• Component 1080p Adjustment in Component1 input

mode

• RGB 1080p adjustment in RGB input mode

• If you success RGB 1080p Adjust. You can see “ADC

RGB-DTV Success”

5.2 EDID (The Extended Display

Identification Data) / DDC (Display Data

Channel) Download.

O Summary

• It is established in VESA, for communication between

PC and Monitor without order from user for building user

condition. It helps to make easily use realize “Plug and

Play” function.

• For EDID data write, we use DDC2B protocol.

O Auto Download

• After enter Service Mode by pushing “ADJ” key,

• Enter EDID D/L mode.

• Enter “START” by pushing “OK” key.

Caution: - Never connect HDMI & D-sub Cable when the user

downloading .

- Use the proper cables below for EDID Writing.

- 14 -

Only for training and service purposes

O Manual Download

• Write HDMI EDID data

- Using instruments

=> Jig. (PC Serial to D-Sub connection) for PC, DDC

adjustment.

=> S/W for DDC recording (EDID data write and

read)

=> D-sub jack

=> Additional HDMI cable connection Jig.

- Preparing and setting.

=> Set instruments and Jig. Like pic.5), then turn on

PC and Jig.

=> Operate DDC write S/W (EDID write & read)

=> It will operate in the DOS mode.

Pic.3) For write EDID data, setting Jig and another instruments.

• EDID data for LJ91D Chassis (Model name = LG TV)

- HDMI-1 EDID table (0x33, 0x2C)

- HDM2 EDID table (0x33, 0x1C)

- HDMI-3 EDID table (0x33, 0x0C)

- Analog (RGB) EDID table (0x9B, 0x25)

Download jig

RGB cable

Main

B/D

Edid data and Model option download (RS232)

NO Item CMD 1 CMD 2 Data 0

Enter

download MODE

Download

Mode In

A E 0 0

When transfer the ’Mode In’ ,

Carry the command.

Edid data and

Model option

download

Download

A E *Note1 *Note2

Automatically download

(The use of a internal Data)

Adjust Mode Out

A E 9 0

Adjustment

Confirmation

A E 9 9

To check Download

on Assembly line.

See Working Guide if you want more information about

EDID communication.

5.3 Adjustment Color Temperature(White

balance)

O Using Instruments

• Color Analyzer: CA-210 (CH 9)

- Using LCD color temperature, Color Analyzer (CA-210)

must use CH 9, which Matrix compensated (White, Red,

Green, Blue compensation) with CS-2100. See the

Coordination bellowed one.

• Auto-adjustment Equipment (It needs when Auto-

adjustment – It is availed communicate with RS-232C :

Baud rate: 115200)

• Video Signal Generator MSPG-925F 720p, 216Gray

(Model: 217, Pattern 78)

O Connection Diagram (Auto Adjustment)

• Using Inner Pattern

• Using HDMI input

<Pic.5 Connection Diagram for Adjustment White balance> .

O White Balance Adjustment

If you can’t adjust with inner pattern, then you can adjust

it using HDMI pattern. You can select option at "Ez-Adjust

Menu – 7. White Balance" there items "NONE, INNER,

HDMI". It is normally setting at inner basically. If you can’t

adjust using inner pattern you can select HDMI item, and

you can adjust.

In manual Adjust case, if you press ADJ button of service

remocon, and enter "Ez-Adjust Menu – 7. White

Balance", then automatically inner pattern operates. (In

case of "Inner" originally "Inner" will be selected.

• Connect all cables and equipments like Pic.5)

• Set Baud Rate of RS-232C to 115200. It may set

115200 orignally.

• Connect RS-232C cable to set

• Connect HDMI cable to set

¢ RS-232C Command (Commonly apply)

wb 00 00 White Balance adjustment start.

wb 00 10 Start of adjust gain (Inner white

pattern)

wb 00 1f End of gain adjust

wb 00 20 Start of offset adjust(Inner white

pattern)

wb 00 2f End of offset adjust

wb 00 ff End of White Balance adjust(Inner

pattern disappeared)

• "wb 00 00": Start Auto-adjustment of white balance.

• "wb 00 10": Start Gain Adjustment (Inner pattern)

• "jb 00 c0" :

• …

• "wb 00 1f": End of Adjustment

* If it needs, offset adjustment (wb 00 20-start, wb 00

2f-end)

• "wb 00 ff": End of white balance adjustment (inner

pattern disappear)

- 15 -

Only for training and service purposes

CA-100+

COL OR

ANALYZER

TYPE; CA-100+

Full W hite Pattern

RS-232C

- 16 -

Only for training and service purposes

O White Balance Adjustment (Manual adjustment)

• Test Equipment: CA-210

- Using LCD color temperature, Color Analyzer (CA-

210) must use CH 9, which Matrix compensated

(White, Red, Green, Blue compensation) with CS-

2100. See the Coordination bellowed one.

• Manual adjustment sequence is like bellowed one.

- Turn to "Ez-Adjust" mode with press ADJ button of

service remocon.

- Select "10.Test Pattern" with CH+/- button and press

enter. Then set will go on Heat-run mode. Over 30

minutes set let on Heat-run mode.

- Let CA-210 to zero calibration and must has gap more

10cm from center of LCD module when adjustment.

- Press "ADJ" button of service remocon and select

"7.White-Balance" in "Ez-Adjust" then press "▶"

button of navigation key.

(When press "▶" button then set will go to full white

mode)

- Adjust at three mode (Cool, Medium, Warm)

- If "cool" mode

Let B-Gain to 192 and R, G, B-Cut to 64 and then

control R, G gain adjustment High Light adjustment.

- If "Medium" and "Warm" mode

Let R-Gain to 192 and R, G, B-Cut to 64 and then

control G, B gain adjustment High Light adjustment.

- All of the three mode

Let R-Gain to 192 and R, G, B-Cut to 64 and then

control G, B gain adjustment High Light adjustment.

- With volume button (+/-) you can adjust.

- After all adjustment finished, with Enter (■ key) turn

to Ez-Adjust mode. Then with ADJ button, exit from

adjustment mode

Attachment: White Balance adjustment coordination and color

temperature.

O Using CS-1000 Equipment.

- COOL : T=11000K, △uv=0.000, x=0.276 y=0.283

- MEDIUM : T=9300K, △uv=0.000, x=0.285 y=0.293

- WARM : T=6500K, △uv=0.000, x=0.313 y=0.329

5.4 Test of RS-232C control.

Press In-Start button of Service Remocon then set the “4.Baud

Rate” to 115200. Then check RS-232C control and

5.5 Selection of Country option.

Selection of country option is allowed only North American model

(Not allowed Korean model). It is selection of Country about

Rating and Time Zone.

• Models: All models which use LA75A Chassis (See the first

page.)

• Press “In-Start” button of Service Remocon, then enter the

“Option” Menu with “PIP CH-“ Button

• Select one of these three (USA, CANADA, MEXICO)

defends on its market using “Vol. +/-“button.

6. GND and ESD Testing

6.1 Prepare GND and ESD Testing.

• Check the connection between set and power cord

6.2 Operate GND and ESD auto-test.

• Fully connected (Between set and power cord) set enter

the Auto-test sequence.

• Connect D-Jack AV jack test equipment.

• Turn on Auto-controller(GWS103-4)

• Start Auto GND test.

• If its result is NG, then notice with buzzer.

• If its result is OK, then automatically it turns to ESD Test.

• Operate ESD test

• If its result is NG, then notice with buzzer.

• If its result is OK, then process next steps. Notice it with

Good lamp and STOPER Down.

6.3 Check Items.

• Test Voltage

- GND: 1.5KV/min at 100mA

- Signal: 3KV/min at 100mA

• Test time: just 1 second.

• Test point

- GND test: Test between Power cord GND and Signal

cable metal GND.

- ESD test: Test between Power cord GND and Live and

neutral.

• Leakage current: Set to 0.5mA(rms)

Only for training and service purposes

LGE Internal Use Only

Block Diagram

MPEG_TS

DDR2

256MB

DDR2

256MB

BCM3556

(400M MIPS)

BCM3556

(400M MIPS)

1080P

LVDS

(Front-end)

(External Input)

EXT_IN

HDMI0_BCM

CVBS_LIVE

TP1

CVBS1/

SIF1

Cable

ISDB-T/

PAL/NTSC

(System + DVR + Scalar)

(Analog DVR)

CVBS2/

SIF2

ISDB-T/

PAL/NTSC

Serial

TP1

Serial

TP2

I2S_BCM

NTP3100L

CVBS1

CVBS2

CVBS_LIVE

CVBS/Y_DVR

COMP1_LR

COMP2_LR

RGB_LR

2069_L/R_OUT1

CXA2069

2069_L/R_OUT2

EXT_IN

HDMI0_BCM

AV1

AV2

NANDFlash

128MB

NANDFlash

128MB

(Etc)

SIF2

SIF1

SPI BUS

USB2.0

SPDIF

SIF_DVR

SIF_LIVE

2069_L/R_OUT1

TP2

I2S_BCM

SPIF225A

HDD

CVBS/Y_DVR

SIF_DVR

2069_L/R_OUT2

SAA7164

MPEG_TS

DDR1

256Mb

DDR1

256Mb

Flash

256KB

Flash

256KB

CPLD

Parallel TS

Serial

I2C

MSPI

TDA9996

(Comp1/2, RGB)

TU_CVBS_DVR

HDMI4

HDMI2

HDMI1

SIDE HDMI_PORT4

UI_HW_PORT1

UI_HW_PORT2

RMX

BCM_SPI_CSb/

BCM_SPI_MISO

TP REMUX PORT

BCM_SPI_MOSI/

BCM_SPI_SCK

MNT_VOUT_DVR

MONITOR_LR+/-_OUT

AMP

MNT_LOUT

MNT_ROUT

MNT_L/ROUT

Not Stuffed

Only for training and service purposes

LGE Internal Use Only

1. Power-Up Boot Fail Trouble Shooting

MPEG_TS

DDR2

256MB

DDR2

256MB

BCM3556

(400M MIPS)

BCM3556

(400M MIPS)

1080P

LVDS

(Front-end)

(External Input)

EXT_IN

HDMI0_BCM

CVBS_LIVE

TP1

CVBS1/

SIF1

Cable

ISDB-T/

PAL/NTSC

(System + DVR + Scalar)

(Analog DVR)

CVBS2/

SIF2

ISDB-T/

PAL/NTSC

Serial

TP1

Serial

TP2

I2S_BCM

NTP3100L

CVBS1

CVBS2

CVBS_LIVE

CVBS/Y_DVR

COMP1_LR

COMP2_LR

RGB_LR

2069_L/R_OUT1

CXA2069

2069_L/R_OUT2

EXT_IN

HDMI0_BCM

AV1

AV2

NANDFlash

128MB

NANDFlash

128MB

(Etc)

SIF2

SIF1

SPI BUS

USB2.0

SPDIF

SIF_DVR

SIF_LIVE

2069_L/R_OUT1

TP2

I2S_BCM

SPIF225A

HDD

CVBS/Y_DVR

SIF_DVR

2069_L/R_OUT2

SAA7164

MPEG_TS

DDR1

256Mb

DDR1

256Mb

Flash

256KB

Flash

256KB

CPLD

Parallel TS

Serial

I2C

MSPI

TDA9996

(Comp1/2, RGB)

TU_CVBS_DVR

HDMI4

HDMI2

HDMI1

SIDE HDMI_PORT4

UI_HW_PORT1

UI_HW_PORT2

RMX

BCM_SPI_CSb/

BCM_SPI_MISO

TP REMUX PORT

BCM_SPI_MOSI/

BCM_SPI_SCK

MNT_VOUT_DVR

MONITOR_LR+/-_OUT

AMP

MNT_LOUT

MNT_ROUT

MNT_L/ROUT

Not Stuffed

Only for training and service purposes

LGE Internal Use Only

1. Power-Up Boot Fail Trouble Shooting

Replace Power board

Check Micom IC407

Redownload or replace

Check P800 All Voltage Level

(20V, 12V, 5V_ST)

Check Power connector

Check Voltage Level 3.3V at L815

Replace one of

IC807/IC802/L815/L823/L810/L826

& Recheck

Check Voltage Level 2.5V at L827

Replace one of IC803/L824/L827

& Recheck

Check Voltage Level 1.8V

at IC804 #6 pin

Replace one of IC804/L825

& Recheck

Check Voltage Level 1.2V at L803

Replace one of

IC809/IC800/L803/L816/L819/L801

& Recheck

Check X201 Clock 54MHz

Replace X201

Check signal transition

at IC101 #9 pin

Maybe BCM3556 has troubles

Replace IC101 Flash Memory

Check All Voltage Level

at L804/L807/L808

Replace one of L804/L807/L808

& Recheck

Only for training and service purposes

LGE Internal Use Only

2. No OSD Trouble Shooting

MPEG_TS

DDR2

256MB

DDR2

256MB

BCM3556

(400M MIPS)

BCM3556

(400M MIPS)

1080P

LVDS

(Front-end)

(External Input)

EXT_IN

HDMI0_BCM

CVBS_LIVE

TP1

CVBS1/

SIF1

Cable

ISDB-T/

PAL/NTSC

(System + DVR + Scalar)

(Analog DVR)

CVBS2/

SIF2

ISDB-T/

PAL/NTSC

Serial

TP1

Serial

TP2

I2S_BCM

NTP3100L

CVBS1

CVBS2

CVBS_LIVE

CVBS/Y_DVR

COMP1_LR

COMP2_LR

RGB_LR

2069_L/R_OUT1

CXA2069

2069_L/R_OUT2

EXT_IN

HDMI0_BCM

AV1

AV2

NANDFlash

128MB

NANDFlash

128MB

(Etc)

SIF2

SIF1

SPI BUS

USB2.0

SPDIF

SIF_DVR

SIF_LIVE

2069_L/R_OUT1

TP2

I2S_BCM

SPIF225A

HDD

CVBS/Y_DVR

SIF_DVR

2069_L/R_OUT2

SAA7164

MPEG_TS

DDR1

256Mb

DDR1

256Mb

Flash

256KB

Flash

256KB

CPLD

Parallel TS

Serial

I2C

MSPI

TDA9996

(Comp1/2, RGB)

TU_CVBS_DVR

HDMI4

HDMI2

HDMI1

SIDE HDMI_PORT4

UI_HW_PORT1

UI_HW_PORT2

RMX

BCM_SPI_CSb/

BCM_SPI_MISO

TP REMUX PORT

BCM_SPI_MOSI/

BCM_SPI_SCK

MNT_VOUT_DVR

MONITOR_LR+/-_OUT

AMP

MNT_LOUT

MNT_ROUT

MNT_L/ROUT

Not Stuffed

Only for training and service purposes

LGE Internal Use Only

2. No OSD Trouble Shooting

Replace Power board

Check 12V Voltage Level

at P800 #13 Pin

Check Power connector

Check 12V Voltage Level at L903

Replace one of

Q900/Q901/Q902/L903

& Recheck

Check P903

#16(TXAC-), #17(TXAC+),

#32(TXBC-), #33(TXBC+)

Check LVDS Cable

Replace Cable

Check Voltage LCD Module

Check 12V Voltage Level

at L902

Replace one of L804/L902

& Recheck

Maybe BCM3556(IC100)

has troubles

Only for training and service purposes

LGE Internal Use Only

3. Digital TV Video Trouble Shooting

MPEG_TS

DDR2

256MB

DDR2

256MB

BCM3556

(400M MIPS)

BCM3556

(400M MIPS)

1080P

LVDS

(Front-end)

(External Input)

EXT_IN

HDMI0_BCM

CVBS_LIVE

TP1

CVBS1/

SIF1

Cable

ISDB-T/

PAL/NTSC

(System + DVR + Scalar)

(Analog DVR)

CVBS2/

SIF2

ISDB-T/

PAL/NTSC

Serial

TP1

Serial

TP2

I2S_BCM

NTP3100L

CVBS1

CVBS2

CVBS_LIVE

CVBS/Y_DVR

COMP1_LR

COMP2_LR

RGB_LR

2069_L/R_OUT1

CXA2069

2069_L/R_OUT2

EXT_IN

HDMI0_BCM

AV1

AV2

NANDFlash

128MB

NANDFlash

128MB

(Etc)

SIF2

SIF1

SPI BUS

USB2.0

SPDIF

SIF_DVR

SIF_LIVE

2069_L/R_OUT1

TP2

I2S_BCM

SPIF225A

HDD

CVBS/Y_DVR

SIF_DVR

2069_L/R_OUT2

SAA7164

MPEG_TS

DDR1

256Mb

DDR1

256Mb

Flash

256KB

Flash

256KB

CPLD

Parallel TS

Serial

I2C

MSPI

TDA9996

(Comp1/2, RGB)

TU_CVBS_DVR

HDMI4

HDMI2

HDMI1

SIDE HDMI_PORT4

UI_HW_PORT1

UI_HW_PORT2

RMX

BCM_SPI_CSb/

BCM_SPI_MISO

TP REMUX PORT

BCM_SPI_MOSI/

BCM_SPI_SCK

MNT_VOUT_DVR

MONITOR_LR+/-_OUT

AMP

MNT_LOUT

MNT_ROUT

MNT_L/ROUT

Not Stuffed

Only for training and service purposes

LGE Internal Use Only

3. Digital TV Video Trouble Shooting

Check RF Cable

Check TP Clock, Data, Sync

R1111, R1103, R1102

Maybe Tuner(TU1100) has

problems

Maybe BCM3556(IC100)

has problems

Check Tuner(TU1100) Power

(5.0V, 2.5V, 3.3V, 1.2V)

Replace one of

L1111/L1101/L1102/L1103/L1104

& Recheck

+ 53 hidden pages