LG 32LH70YD-SH Schematic

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LJ91D

MODEL : 32LH70YD

32LH70YD-SH

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 : MFL61862402 (0905-REV01)

Only for training and service purposes

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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

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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 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 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 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

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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.

Only for training and service purposes

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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 LJ91D 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: CE, IEC specification

- EMC: CE, IEC specification

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 Cent 32 inch Wide(1920x1080)

42 inch Wide(1920x1080) 47 inch Wide(1920x1080)

LC320WUD-SBA1(Vitaz 4) LC420WUD-SBT1(Vitaz 4) LC470WUD-SAT1(Vitaz 4)

32LH70YD-SH 42LH70YD-SE 47LH70YD-SE

ral and South AMERICA

Screen Size

6. Aspect Ratio 16:9

7. Tuning System FS

Module

Operating Environment 1) Temp : 0 ~ 40 deg

2) Humidity : ~ 80 %

10.

Storage Environment 1) Temp : -20 ~ 60 deg

2) Humidity : ~ 85 %

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Only for training and service purposes

5. Chromiance & Luminance spec.

32LH70YD-SH

Item Min Typ Max Unit Remark

Module cd/m 1. Max Luminance (Center 1-point / Full White Pattern)

Set

400 500 400 500 cd/m

2. 3.Luminance uniformity 77 % Full white

0.638

0.334

RED

0.291

0.607

GREEN

0.145

0.062

BLUE

0.279

10.

Color coordinate

WHITE

Typ.

-0.03

0.292

Typ.

+0.03

11. Color coordinate uniformity N/A 900:1 1300:1 NORMAL

Contrast ratio

50000:1 80000:1 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

<Test Condition> 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

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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 O O O O O O O O O O

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

O O O O O O O O O O

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

100 100 50

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.

32LH70YD-SH

Item Content Unit Remark

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

632.9803 284.8 803 75 970 640

With Stand With Stand

W/O Packing

With Packing

584.2

Product Dimension

177 mm

With Stand

13.5 With Stand With Stand

11.6

Product Weight

15.9 Kg

With Stand

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.

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 Autoadjustment – 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 EYE-Q Function check.

1) Turn on TV

2) Press EYE Key of Adj R/C

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 va;ie os ;pwer tjam 10 of the ‘Raw Data (Sensor data, Back light)”. If after 6 seconds, R/G/B value is not lower than 10, re[;ace EYE Q II sensor.

5) Remove your hand from the EYE Q II sensor and wait for 6 sencond

6) Confirm that “OK” pop up.

If change is not seen, replace EYE Q II sensor

5.5 Test of RS-232C control

Press IN-Start button of service remocon then set the “4.Baud rate” to 15200, Then check RS-232C control and

5.6 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.

* Caution : Don’t push The Instop Key ater completing the

function inspection.

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)

Block Diagram

Overall Block Diagram for Brazil DTV (LH70)

TU_SCLK, TU_SDATA, TU_SYNC

VA1G5BF8005

RF_Switch, Gain_Switch

TU_CVBS_IN TU_SIF

SDA0/SCL0_3.3V

LVDS

DDR2(256Mbit)

Qimonda/Hynix

FRC IC

(MST7323S)

LCD Module

(FHD, 120Hz)

JACK BACK

at REAR

AV1 AV2

Component 1 Component 2

D-sub RGB

Audio L/R (for RGB)

HDMI 1 HDMI 2 HDMI 3

Digital Audio (Optic)

RS-232C (Ctrl./SVC)

Bluetooth Module

USB

CVBS, L/R, AV_DET

SIDE_CVBS, SIDE_L/R, SIDE_DET

Y Pb Pr, L/R, DET Y Pb Pr, L/R, DET

RGB/H/V

Audio L/R

3x1

HDMI Switch

SPDIF

RX/TX RX/TX

MAX3232

DP1/DM1

DP2/DM2

O.C. Protector

+5V+5V

USB_DM1 USB_DP1

USB_DM2 USB_DP2

BCM3556

(Brazil)

DDR_Data[0:15], DQS, DM …

Addr.[0:13], ctrl. data

Data[16:31]

Data [0 … 7]

CS ,RE,WE……

I2S

SCL, SDA_3.3V

FRC Block

X-tal

12MHz

DDR2 (1Gbit)

NAND Flash

(512Mbit)

Digital AMP

NTP3100L

NVRAM

Elpida/Hynix

Reset Switch

Reset IC

X-tal

54MHz

SCL, SDA_3.3V

CLK,TDI,TDO,MS,RST

MICOM

(MTV416GMF)

JTAG

X-tal

24MHz

LGE Internal Use Only

Block Diagram

I2C & RS232 Communication

VA1G5BF8005

MAX3232

Sub B/D

47PF

RS232C_RxD

RS232C_TxD

22 ohm

47PF

+5V_ST

4.7k ohm

D3.3V

4.7k ohm

P 7 0

22 ohm 22 ohm

Main B/D

SCL0

SDA0

SCL1

SDA1

22 ohm 22 ohm

D3.3V

4.7k ohm

+3.3V_HDMI

2.7k ohm

0 ohm 0 ohm

HDMI

S/W

100 ohm

NTP3100L

33PF

D3.3V

BCM3556

SCL3

P 7 0

100 ohm 100 ohm

SDA3

22 ohm

4.7k ohm

D3.3V

4.7k ohm

22 ohm

33PF

MICOM

SCL2 SDA2

22 ohm

4.7k ohm

100 ohm 100 ohm

MST7323

LGE Internal Use Only

Block Diagram

• I2C channel [LH70]

CH0

CH1

BCM3556

CH2

CH3

TUNER 1

0xC2

Demod(0x30)

QPSK(0x32)

AMP

NTP3100L

0x54

EEPROM

AT24C512

0xA6

FRC

MST7323

HDMI SW

TDA9996

Micom

MTV416

0x50

CH0 (+3.3V)

(+ 3.3V)

CH1

CH2 (+3.3V)

(+3.3V)

CH3

LGE Internal Use Only

Block Diagram

Jack

Board

D1.2V, D2.5V, +3.3V, +5.0V_ST

SPDIF , EDID_WP ….

SCL0_3.3V, SDA0_3.3V, DDC_SCL, DDC_SDA

CVBS, SIF, AV, RGB ,COMPONENT, R/L,

TU_SCLK, TU_DATA, TU_SYNK’’..

MAIN

Board

< Signal Interface >

LGE Internal Use Only

1. Power-Up Boot Fail Trouble Shooting

Overall Block Diagram for Brazil DTV (LH70)

VA1G5BF8005

TU_SCLK, TU_SDATA, TU_SYNC

SDA0/SCL0_3.3V

RF_Switch, Gain_Switch

TU_CVBS_IN TU_SIF

LVDS

DDR2(256Mbit)

Qimonda/Hynix

FRC IC

(MST7323S)

LCD Module

(FHD, 120Hz)

JACK BACK

at REAR

AV1 AV2

Component 1 Component 2

D-sub RGB

Audio L/R (for RGB)

HDMI 1 HDMI 2 HDMI 3

Digital Audio (Optic)

RS-232C (Ctrl./SVC)

Bluetooth Module

USB

CVBS, L/R, AV_DET

SIDE_CVBS, SIDE_L/R, SIDE_DET

Y Pb Pr, L/R, DET Y Pb Pr, L/R, DET

RGB/H/V

Audio L/R

3x1

HDMI Switch

SPDIF

RX/TX RX/TX

MAX3232

DP1/DM1

DP2/DM2

O.C. Protector

+5V+5V

USB_DM1 USB_DP1

USB_DM2 USB_DP2

BCM3556

(Brazil)

DDR_Data[0:15], DQS, DM …

Addr.[0:13], ctrl. data

Data[16:31]

Data [0 … 7]

CS ,RE,WE……

I2S

SCL, SDA_3.3V

FRC Block

X-tal

12MHz

DDR2 (1Gbit)

NAND Flash

(512Mbit)

Digital AMP

NTP3100L

NVRAM

Elpida/Hynix

Reset Switch

Reset IC

X-tal

54MHz

SCL, SDA_3.3V

CLK,TDI,TDO,MS,RST

MICOM

(MTV416GMF)

JTAG

X-tal

24MHz

LGE Internal Use Only

1. Power-Up Boot Fail Trouble Shooting

Check P801 All Voltage Level

(24V, 12V, 5V_ST)

Check All Voltage Level

at L805/L807/L808

Check Voltage Level 3.3V at L830

Check Voltage Level 2.5V at L827

Check Voltage Level 1.8V

at IC802 #2 pin or L815

Check Voltage Level 1.2V at L821

Check X903 Clock 54MHz

Check Power connector

Replace one of L805/L807/L808

& Recheck

Replace one of

IC809/Q812/L828/L829/L830/L822

& Recheck

Replace one of IC803/L824/L827

& Recheck

Replace one of IC802/IC805/L815

& Recheck

Replace one of

IC804/Q809/L811/L817/L821

& Recheck

Replace X903

Replace Power board

Check Micom IC406

Redownload or replace

Check signal transition

at IC101 #9 pin

Replace IC101 Flash Memory

Maybe BCM3556 has troubles

LGE Internal Use Only

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