LG 42LB9D - - 42"" LCD TV, 42LB9DF, 42LB9DF-AD Service Manual

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LB75A

MODEL : 42LB9DF

42LB9DF-AD

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CONTENTS

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

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

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

ADJUSTMENT INSTRUCTION ...............................................................13

TROUBLE SHOOTING & BLOCK DIAGRAM ........................................19

EXPLODED VIEW .................................................................................. 43

REPLACEMENT PARTS LIST ............................................................... 47

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

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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 Replacement Parts List. 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

IMPORTANT SAFETY NOTICE

0.15uF

To Instrument's exposed  METALLIC PARTS

AC Volt-meter

Good Earth Ground such as WATER PIPE, CONDUIT etc.

1.5 Kohm/10W

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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 wirebristle (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 circuitboard 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

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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.

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SPECIFICATION

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

4. General Specification(TV)

No. Item Specification Remark

1. Broadcasting system PAL-B/B, DTV : DVB-T

2. Available Channel 1) VHF : 00 ~ 12

2) UHF : 20 ~ 75

3) CATV : 02 ~ 44

4) DTV : 06 ~12, 27 ~ 69

3. Tuner IF 1) PAL : 38.90MHz(Picture),

34.40MHz(Sound)

2) DVB-T : 36.125MHz

4 Input Voltage AC 100 ~ 240 V, 50/60Hz Mark : 240V, 50Hz

5. Screen Size 42 inch Wide(1920 x 1080)

47 inch Wide(1920 x 1080)

52 inch Wide(1920 x 1080)

6. Aspect Ratio 16:9

7. Module LC420WU2-SLB2 42LB9DF

LC470WU1-SLB2 47LB9DF

LC520WU1-SLB1 52LB9DF

8. Operating Environment 1) Temp : 0 ~ 40 deg

2) Humidity : ~ 80 %

9. Storage Environment 1) Temp : -20 ~ 60 deg

2) Humidity : ~ 85 %

1. Application Range.

This spec sheet is applied to the 42"/47"/52" LCD TV used LB75A chassis.

2. Specification

Each part is tested as below without special appointment

2.1 Temperature : 25±5°C(77±9°F), CST : 40±5°C

2.2 Relative Humidity : 65±10%

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

• Standard Voltage of each products is marked by models

2.4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM .

2.5 The receiver must be operated for about 20 minutes prior to the adjustment.

3. Test method

3.1 Performance : LGE TV test method followed.

3.2 Demanded other specification Safety : CB specification

3.3 EMC : CISOR 13 specification

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5. Chrominance & Luminance Specification

No Item Min Typ Max Unit Remark

1. White peak brightness 400 550 cd/m

42LB9DF

450 550 cd/m

47LB9DF

TBD TBD cd/m

52LB9DF

2. Contrast ratio cd/m

N/A

3. Brightness uniformity 80 % Full white

4. Color coordinate RED X Typ. 0.638 Typ.

Y -0.03 0.340 +0.03

GREEN X 0.279

Y 0.611

BLUE X 0.146

Y 0.062

WHITE X 0.272

Y 0.278

5. Color coordinate uniformity N/A

6. Contrast ratio 1100:1 1600:1 42/47LB9DF

All mode except RGB/HDMI-PC

(With PWM Dimiming)

500:1 800:1 RGB/HDMI-PC

(Without PWM Dimmng)

TBD TBD 52LB9DF

7. Color Temperature Cool 11,000 <Test Condition>

Medium 9,300

HDMI input,

Warm 6,500 85% Full white pattern

8. Color Distortion, DG 10.0 %

9. Color Distortion, DP 10.0 deg

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

11. Color Killer Sensitivity -80 dBm

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Peak & average Brightness & Contrast measure standard specification

- White Peak brightness measure specification

1) In non-impressed condition, measure peak brightness displayable as much as possible LCD module.

2) Measuring instrument: CA-210 or a sort of Color Analyzer.

3) Pattern Generator : VG-828 or a sort of digital pattern generator (displayable Full White & 1/25 White Window pattern)

4) Measure condition

- Test pattern: in center, 1/5(H)x1/5(V) of Window Pattern (white pattern in non-impressed condition)

- SET condition : Contrast & Brightness Level 100%

- Environment condition : Dark room in the non outside light

- Video menu option condition

5) Measurement

- Do heat-run LCD module at 30minutes in normal temperature (25°C) by using full white pattern of 15% signal level(38 gray level).

- Impress test pattern signal in 1/5(H)x1/5(V) White Window of 100%(255Gray Level)

- measure 3 times brightness of central white window, and mark peak brightness in max brightness degree

- measure the same condition in video signal /RGB signal.

Average Brightness measure specification

1) Impress 100%(255Gray Level) full white pattern at the same peak brightness measurement.

2) Measure average brightness in 9 points.

Contrast ratio measure specification

1) Test display signal : 30x30 dots White Window signal & all Black Raster signal

2) Dark room measure condition : Using touch type Color analyzer CA-100 Dark room in the non outside light

3) Bright room measure condition : In bright room of 150Lx illumination in the panel surface, locate a source of light on the above 45°of the panel surface.

4) Measure method

- In standard test condition, impress 30x30 dots White Window Pattern signal .

Measure center peak brightness degree Lw of white window

- Impress black Raster signal as contrast ratio measurement signal.

Measure black brightness degree Lb of PDP central Calculate the following numerical formula. Contrast ratio = Lw / Lb

* If it does not use Prior measurement, use generally simple test measurement.

The Correct measure specification is followed by IEC61988-2/CD, JAPAN EIAJ-2710

Signal Picture Mode XD Black Level

RF PAL USER1 On N/A

AV PAL USER1 On Low

Component 720P USER1 On N/A

RGB 1024x768 USER1 N/A N/A

HDMI DTV 720P USER1 On High

1 4 7

2 5 8

3 6 9

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6. Component Input (Y, CB

/PB, CR/PR)

7. RGB PC

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

PC DDC

1 720*400 31.469 70.08 28.32 DOS O

2 640*480 31.469 59.940 25.175 VESA(VGA) O

3 640*480 37.500 75.000 31.500 VESA(VGA) O

4 800*600 37.879 60.317 40.000 VESA(SVGA) O

5 800*600 46.875 75.000 49.500 VESA(SVGA) O

6 1024*768 48.363 60.004 65.000 VESA(XGA) O

7 1024*768 56.476 70.069 75.000 VESA(XGA) O

8 1024*768 60.023 75.029 78.750 VESA(XGA) O

9 1280*768 47.776 59.870 79.500 VESA(WXGA) X

10 1360*768 47.712 60.015 85.500 VESA(WXGA) O

11 1366*768 47.13 59.65 72.00 X

12 1280*1024 63.981 60.020 108.000 VESA(SXGA) O

13 1280*1024 79.976 75.025 135.000 VESA(SXGA) O

14 1600*1200 75.000 60.000 162.000 VESA(UXGA) O

15 1920*1080 67.500 60.000 148.500 HDTV 1080P O

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

1. 720*576 15.625 50.00 13.50 SDTV576i

2. 720*576 31.25 50.00 27.00 SDTV576p

3. 720*480 15.73/15.75 59.94/60.00 13.50 SDTV 480i

4. 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p

5. 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P

6. 1280*720 37.50 50.00 74.25 HDTV 720P

7. 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i

8. 1920*1080 28.125 50.00 74.25 HDTV 1080i

9. 1920*1080 26.97/27.00 23.976/24.00 74.1757/74.25 HDTV 1080P

10. 1920*1080 33.716/33.750 29.97/30.00 74.1762/74.25 HDTV 1080P

11. 1920*1080 56.25 50.00 148.50 HDTV 1080P

12. 1920*1080 67.43/67.50 59.94/60.00 148.50 HDTV 1080P

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8. HDMI Input (PC/DTV)

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

PC DDC

1 720*400 31.469 70.08 28.32 DOS O

2 640*480 31.469 59.940 25.175 VESA(VGA) O

3 640*480 37.500 75.000 31.500 VESA(VGA) O

4 800*600 37.879 60.317 40.000 VESA(SVGA) O

5 800*600 46.875 75.000 49.500 VESA(SVGA) O

6 1024*768 48.363 60.004 65.000 VESA(XGA) O

7 1024*768 56.476 70.069 75.000 VESA(XGA) O

8 1024*768 60.023 75.029 78.750 VESA(XGA) O

9 1280*768 47.776 59.870 79.500 VESA(WXGA) X

10 1360*768 47.712 60.015 85.500 VESA(WXGA) O

11 1366*768 47.13 59.65 72.00 X

12 1280*1024 63.981 60.020 108.000 VESA(SXGA) O

13 1280*1024 79.976 75.025 135.000 VESA(SXGA) O

14 1600*1200 75.000 60.000 162.000 VESA(UXGA) O

15 1920*1080 67.500 60.000 148.500 HDTV 1080P O

DTV

1 720*576 31.25 50.00 27.00 SDTV576p

2 720*480 31.47/31.50 59.94/60.00 27.00 SDTV 480p

3 1280*720 44.96/45.00 59.94/60.00 74.25 HDTV 720P

4 1280*720 37.50 50.00 74.25 HDTV 720P

5 1920*1080 33.72/33.75 59.94/60.0 74.25 HDTV 1080i

6 1920*1080 28.125 50.00 74.25 HDTV 1080i

7 1920*1080 26.97/27.00 23.976/24.00 74.1757/74.25 HDTV 1080P

8 1920*1080 33.716/33.750 29.97/30.00 74.1762/74.25 HDTV 1080P

9 1920*1080 56.25 50.00 148.50 HDTV 1080P

10 1920*1080 67.43/67.50 59.94/60.00 148.50 HDTV 1080P

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9. General specifications

9-1. 42" LCD Full HD(LC420WU2-SLB2)

No Item Specification Unit Remark

1 Active Screen Size 42.026 inches(1067.31mm) mm

2 Outline dimension 983.0(H)x576.0(V)x51.0(D) mm

3 Pixel Pitch 0.4845x0.4845 mm

4 Pixel Format 1920 horiz. By 1080 vert. RGB Stripe arrangement

5 Color Depth 8-bit / 16.7M Color

6 Luminance, White 550 cd/m2(Center 1point,Typ)

7 Power Consumption Total 167.3 Watt(Typ)

8 Weight 13.0Kg(Typ)

9 Display Operating Mode Transmissive Mode, Normally Black

10 Surface Treatment

Hard Coating (3H) Anti-glare treatment of the front polarizer

9-2. 47" LCD MODULE (LC470WU1-SLB2)

No Item Specification Unit Remark

1 Active Screen Size 46.96 inches(1192.87mm)

2 Outline dimension 1096.0(H)x640.0(V)x481(D) mm

3 Pixel Pitch 0.5415x0.5415x RGB mm

4 Pixel Format 1920 horiz by 1080 vert. RGB Stripe arrangement

5 Color Depth 8-bit / 16.7M Color

6 Luminance, White 550 cd/m2 kg

7 Power Consumption Total 230.56 Watt

8 Weight 20.0Kg

9 Display Operating Mode Transmissive Mode, Normally Black

10 Surface Treatment

Hard Coating (3H), Anti-glare treatment of the front polarizer

9-3. 52" LCD MODULE (LC520WU1-SLB1)

No Item Specification Unit Remark

1 Active Screen Size TBD

2 Outline dimension TBD mm

3 Pixel Pitch TBD mm

4 Pixel Format 1920 horiz by 1080 vert. RGB Stripe arrangement

5 Color Depth TBD

6 Luminance, White TBD kg

7 Power Consumption TBD

8 Weight TBD

9 Display Operating Mode Transmissive Mode, Normally Black

10 Surface Treatment

Hard Coating (3H), Anti-glare treatment of the front polarizer

- 12 -

10. Mechanical specification

10-1. 42LB9DF

No. Item Content Unit Remark

1. Product Widt(W) Length(D) Height(H) mm

Dimension Before Packing 1030.8 333.2 779.8 mm With Stant

After Packing 1118 366 814 mm

2. Product Only SET 26.8 Kg

With BOX 32.9 Kg

10-2. 47LB9DF

No. Item Content Unit Remark

1. Product Widt(W) Length(D) Height(H) mm

Dimension Before Packing 1150 366.6 767.8 mm With Stant

After Packing 1236 462 967 mm

2. Product Only SET 37.76 Kg

With BOX 43.6 Kg

10-3. 52LB9DF

No. Item Content Unit Remark

1. Product Widt(W) Length(D) Height(H) mm

Dimension Before Packing TBD mm With Stant

After Packing TBD mm

2. Product Only SET TBD Kg

With BOX TBD Kg

- 13 -

ADJUSTMENT INSTRUCTION

1. Scope

These instructions are applied to all of the LCD TV, LB75A Chassis.

2. Designation

2.1 Because this chassis is a non-charge type chassis of

power supply insulation, it does not require an insulation type transformer. But it is preferable to use an insulation type transformer between the power supply line and the chassis input side to operate it before the adjustment.

2.2 The adjustment must be done in the accurate order. But it

can be changed considering the mass production capability.

2.3 Unless specified specially, the adjustment must be done

in an environment with the surrounding temperature of 25 ±5°C and relative humidity of 65 ±10%.

2.4 The input voltage of the receiver during the adjustment

must be maintained at 220V, 60Hz.

2.5 Unless specified otherwise, the receiver must be pre-

operated for 15 minutes before the adjustment.

Caution) When you keep the still screen on for more than 20

minutes (Especially for internal Digital pattern (13 CH), Cross Hatch Pattern (09CH) with higher black/white contrast), be careful not to create residual image on the black level part.

3. Board adjustment

- Adjust MST3361-Set

- Adjust Video-Set

4. EDID(The Extended Display Identification Data) / DDC (Display Data Channel) Download

4.1 Introduction

This has been established by VESA and is the function created to "Plug and Play" by making the computer reconfigure user environment through communication with the monitor automatically without having the user set commands directly to the PC or the monitor so that the user can use it immediately.

When writing EDID, use the DDC2B protocol.

4.2 HDMI EDID Data input

1) Using device a. Jig for PC, DDC adjustment (PC serial to D-sub

connection device) b. DDC recording S/W (EDID Data Write & Read) c. D-Sub terminal d. Separate HDMI Cable connecting JIG is necessary

2) Adjustment preparation and device configuration a. Configure as Fig., and turn on the PC b. Run the DDC recording S/W (EDID Data Write & Read).

(Execute in DOS mode)

LCD TV SET

(or Digital Board)

Device configuration diagram for HDMI EDID Data input

4.3 EDID Data for LB75A(42/47/52LB9DF)

O HDMI1 EDID (DDC (Display Data Channel) Data EDID table =

O HDMI2 EDID (DDC (Display Data Channel) Data

EDID table =

O HDMI3 EDID (DDC (Display Data Channel) Data EDID table =

O RGB EDID Data EDID table =

- 14 -

0123456789ABCDEF

000FFFFFFFFFFFF001E6D010001010101 10 0E 10 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23 20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40 30 D1 C0 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 C4 8E 21 00 00 1E 66 21 50 B0 51 00 1B 30 50 40 70 36 00 C4 8E 21 00 00 1E 00 00 00 FD 00 38 60 4B 1F 44 0F 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 15

0123456789ABCDEF

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5. MST3361M-Set Adjustment

5-1. Synopsis

The Component 480i/1080p RGB 1080p adjustment sets the optimal black level and gain automatically from the analog => digital converter, and is the function to correct the RGB deviation

5-2. Test Equipment

Service R/C, 801GF(802B,802F,802R), MSPG-925FA, MSPG-1025D Pattern Generator. (480i, 1080i Horizontal 60Hz Color Bar Pattern output will be possible and the output level will accurately have to be revised with 0.7±0.1Vp-p)

* Because the above pattern can differ by the model and pattern

for each device, you must check the pattern first.

5-3. Adjustment

(1) Component 1 adjustment method

(A) Enter the Color Bar Pattern of each 480i 60Hz Mode that

can support the input for Component 1, and select Component 1 as the input mode.

(B) 1 second after receiving the signal, press the ADJ key on

adjustment R/C to enter Ez-Adjust. Select '1. Adjust 480i Comp1' and press the Vol+ KEY to adjust the Component.

message saying 'ADC Component1 Success'.

(D) When the adjustment is not done properly, you will see a

message saying 'ADC Component1 480i Fail'. When the Component is not connected, a message saying 'Component1 Not Connected', when the input format is not 480i, a message saying 'Not Valid Format' and when there is no input signal, a message saying 'Check Signal Status' will be displayed for 1 second.

(2) Component 1, RGB adjustment method

(A) Enter the Color Bar Pattern of each 1080p 60Hz Mode

that can support Component 1 and RGB input, and select Component 1 as the input mode.

(B) 1 second after receiving the signal, press the ADJ key on

adjustment R/C to enter Ez-Adjust. Select '2. Adjust 1080p Comp1/RGB' and press the Vol£´KEY to have Component 1 adjusted automatically.

message saying "ADC Component1 Success". When the adjustment is not done properly, you will see a message saying 'ADC Component1 1080P Fail'. When Component 1 adjustment is completed, it is automatically switched to RGB-DTV Mode to start RGB adjustment. When the adjustment is normally completed, you will see a message saying "ADC RGB 1080P Success".

(D) When the adjustment is not done normally, make the

adjustments again after checking the Pattern or adjustment conditions. The error message is as shown as (D) of 4.2.3.1.

(E) When the adjustment is completed, press the ADJ key to

exit the adjustment mode.

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(Adjustment pattern : 480i / 1080P 60Hz Pattern)

6. White Balance adjustment

6-1. Using device

A. Color Analyzer : CA-210 (CH 9)

When adjusting the LCD white balance, channel No. 9 with Matrix adjustment (White, Red, Green, Blue adjustment) with CS-1000 must be used for the color analyzer (CA-210), and it must be adjusted in accordance with the white balance adjustment coordinate shown below. .

B. Automatic adjuster (Necessary for automatic adjustment, must

be able to communicate with RS-232C, Baud Rate : 115200)

C. Video Signal Generator MSPG-925F 720p, 216Gray (Model

:217, Pattern 78)

6-2. Measuring device connection diagram

(for automatic adjustment)

=> Connection diagram for internal pattern

=> Connection diagram for HDMI input

6-3. White Balance adjustment method

When internal pattern is basically not possible to use, you can select HDMI input for adjustment. You can select NONE, INNER and HDMI through the lowest part option from Ez Adjust Menu

5.White Balance menu, and initially it is set to INNER. If you cannot make adjustments using the internal pattern, select HDMI for adjustment. For manual adjustment, press the ADJ key on the adjustment remote controller to enter Ez Adjust 6.White-Balance so that the pattern can automatically be set. (When you set the Option to INNER, initially INNER is always selected initially)

(A) Connect to inner pattern or HDMI input depending on the

measuring device connection diagram of 4.3.2.

(B) Set the Baud Rate of RS-232C to 115200. It is set to 115200

by default. (C) Connect the RS-232C Cable to the set. (D) Connect the HDMI Cable to the set. (Limited to HDMI option) (E) Select and adjust the model applicable to LB75A chassis

from the adjustment device.

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Full W h ite Patter n

RS-232C

CA-100+

COLOR

ANALYZER

TYPE; CA-100+

6-4. White Balance adjustment (For manual

adjustment)

A. Color Analyzer : CA-210

When adjusting the plasma white balance, channel No. 9 with Matrix adjustment (White, Red, Green, Blue adjustment) with CS-1000 must be used for the color analyzer (CA-210), and it must be adjusted in accordance with the white balance

adjustment coordinate shown below. B. Manual adjustment is executed in the following order. (A) Press the ADJ button of the adjustment R/C to enter 'EZ-

ADJUST'. (B) Press 9.TEST PATTERN with the CH + / - KEY and execute

the HEAT RUN for more than 30 minutes by pressing the

Enter KEY. (C) Do a zero calibration for CA-210 and set it at a distance less

than 10Cm at the center of the LCD module surface. (D) Press the ADJ button of adjustment R/C to select '6.White-

Balance' of 'Ez-Adjust', and press the right KEY (

) to enter the adjustment mode. (When you press the

button, it switches to Full White inner

pattern.)

(E) Adjustment is done in three white balance of COOL,

MEDIUM and WARM.

(F) When white balance is Cool,

Set to B Gain 192 and set to R-Cut / G-Cut / B-Cut 64 Make High Light adjustment using R Gain / G Gain. When white balance is Medium, Set to R Gain 192 and set to R-Cut / G-Cut / B-Cut 64 Make High Light adjustment using G Gain / B Gain. When white balance is Warm Set to R Gain 192 and set to R-Cut / G-Cut / B-Cut 64 Make High Light adjustment using G Gain / B Gain.

(G) Use +, - KEY to adjust the volume. (H) When the adjustment is completed, press the OK (

KEY)

button to move to the Ez-Adjust screen. Press the ADJ KEY to exit the adjustment mode.

- Reference : White Balance adjustment coordinate and white balance

a) Standard white balance and standard color coordinate

chart when measuring using CS-1000 device

COOL : T=11000K,

uv=0.000, x=0.276 y=0.283

MEIDUM : T=9300K,

uv=0.000, x=0.285 y=0.293

WARM : T=6500K,

uv=0.000, x=0.313 y=0.329

b) Color coordinate chart when using CA-210 CH 9

* Brightness: Full white 216 gray

6-5. Video Set adjustment

This is the adjustment to reduce the color gap between the RF and Video signal, and the adjustments can be made for Analog RF, AV-PAL and AV-NTSC.

6-5-1. Analog RF and AV-PAL adjustment method

(A) Connect the Video Signal Generator (Master) to the TV

AV input terminal as AV output. If you enter the input pattern, at this time, as Model: 202(PAL) and Pattern: 33 (100% color Bar), the following screen will be displayed.

< Model : 202(PAL) , Pattern : 33(100% color Bar) >

* Because the top pattern can differ due to the gap of the model

and pattern depending on the used device, it must be checked.

(B) After entering the internal signal and checking signal receipt,

press the ADJ KEY on the adjustment to enter 'EZ-ADJUST'. Select '3. Adjust RF and AV_PAL' and press the right KEY

(

) to enter the adjustment mode.

automatically switch to TV 3CH, and the following window will be displayed.

(D) When automatic adjustment starts, the main screen is

adjusted and the message saying 'RF-PAL Configuration Success' will be displayed. If the adjustment fails, a message saying 'RF-PAL Configuration Fail' will be displayed.

(E) When the automatic adjustment of RF signal is completed, it

will automatically switch to AV1 mode to execute automatic adjustment for AV-PAL. When automatic adjustment is completed, you will see a message saying 'AV-PAL Configuration Success'. If the adjustment fails, you will see a message saying 'AV-PAL Configuration Fail'

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6-5-2. AV NTSC adjustment method

(A) Connect the Video Signal Generator (Master) to the AV

input terminal as AV output. At this time, If you enter the input pattern, at this time, as Model: 201(NTSC) and Pattern: 33 (100% color Bar), the following screen will be displayed

< Model : 201(NTSC) , Pattern : 33(100% color Bar) >

* Because the top pattern can differ due to the gap of the model

and pattern depending on the used device, it must be checked.

(B) Press the ADJ KEY on the adjustment to enter 'EZ-

ADJUST'. Select '4. Adjust AV_NTSC' and press the right KEY (

) to enter the adjustment mode.

a message saying 'AV-NTSC Configuration Success'. If the adjustment fails, you will see a message saying 'AVNTSC Configuration Fail'

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- 19 -

TROUBLESHOOTING & BLOCK DIAGRAM

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+ 44 hidden pages

LG 42LB9D - - 42"" LCD TV, 42LB9DF, 42LB9DF-AD Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual