LG 42LB5RT-TB Schematic

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LA7BA

MODEL : 42LB5RT 42LB5RT-TB

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 : MFL38634802 (0903-REV01)

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LGE Internal Use Only

CONTENTS

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

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

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

ADJUSTMENT INSTRUCTION ...............................................................10

TROUBLE SHOOTING ............................................................................14

BLOCK DIAGRAM...................................................................................26

EXPLODED VIEW .................................................................................. 28

EXPLODED VIEW PARTS LIST..............................................................29

REPLACEMENT PARTS LIST ............................................................... 30

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

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LGE Internal Use Only

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

Replaceable batteries

1.5 Kohm/10W

To Instrument's exposed  METALLIC PARTS

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

AC Volt-meter

IMPORTANT SAFETY NOTICE

0.15uF

CAUTION

RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS

ADVARSEL

Lithiumbatteri - Eksplosionsfare ved fejlagtig hándtening. Udskiftning má kun ske med batteri at samme fabrikat og type. Levér det brugte batteri tilbage til leverandoren

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LGE Internal Use Only

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

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LGE Internal Use Only

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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LGE Internal Use Only

1. Application range

This spec sheet is applied to the 42"/37" LCD TV used LP7BA chassis

2. Specification

Each part is tested as below without special appointment.

(1) Temperature : 25 ± 5°C(77 ± 9°F), CST : 40 ± 5°C (2) Relative Humidity : 65% ± 10% (3) Power Voltage : St andard 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 20 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

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

.

4. General TV Specification

No Item Specification Remark

1. Video input applicable system PAL-D/K, B/G, I, NTSC-M, SECAM, PAL 60

2. Receivable Broadcasting System 1) PAL / SECAM BG

2) PAL / SECAM DK

3) PAL I/I I

4) NTSC

3. RF Input Channel PAL NTSC

VHF E2 ~ E12 2~83

UHF E21 ~ E69

CATV S1 ~ S20 1~71

HYPER S21~ S47

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

5. Market Non-EU

6. Active Screen Size 1067.308 mm (diagonal) 42.02 inches

940.3 mm (diagonal) 37.02 inches

7. Tuning System FVS 100 program

FS

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

2) Humidity : 10 ~ 90 %RH

9. Storage Environment 1) Temp : -20 ~ 50 deg

2) Humidity : 10 ~ 90 %RH

10. Display LCD Module

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LGE Internal Use Only

5. General Specification

No Item Specification Remark

1 . Panel 42" TFT WXGA LCD

37" TFT WXGA LCD

2. Frequency range H : 31 ~ 61Khz PC Input

V : 56 ~ 75Hz

3. Control Function 1) Contrast/Brightness

2) H-Position / V-Position

3) Tracking : Clock / Phase

4) Auto Configure

5) Reset

4. Component Jack(480i/576i/480p/576p/720p/1080i) Y/Pb/Pr : 2EA

5. Power ON LED Power consumption

Green ≤ 260W(42")

≤ 240W(37")

Stand by Cool ≤ 1W

Warm ≤ 40W

6. LCD Module Outline 42" 983 x 576 x 47.3 (H)mm x (V)mm x (D)mm

Dimension 37" 877.0 x 516.8 x 55.5

Pixel Pitch 42" 0.227 x 0.681 x RGB mm

37" 0.200 x 0.600 x RGB

Pixel Format 1366 x 768 Pixels RGB strip arrangement

Coating Hard coating(3H), Anti-glare treatment

of the front polarizer,

Back Light 42" 18CCFL

37" 16CCFL

6. Set Optical Feature

No Item Min Typ Max Unit Maker Remark

1. Luminance AV - 100IRE Full white window

Componet 350 450 LPL(0RT)37",42" pattern

HDMI - APC : Dynamic

PC 250 350

2. Contrast ratio CR 700 900 37" - APC : Dynamic

800 1000 42"

HDMI 720p Full Black Pattern

DCR 8000 10000 37"/42" Measure the black luminance

after 30 seconds.

3. Medium X axis 0.283 0.285 0.287 DQA : ±0.015

Y axis 0.291 0.293 0.295 DQA : ±0.015

4. Cool X axis 0.274 0.276 0.278 DQA : ±0.015 Pattern : Internal pattern of

Y axis 0.281 0.283 0.285 DQA : ±0.015 Torino

5. Warm X axis 0.311 0.313 0.315 DQA : ±0.015

Y axis 0.327 0.329 0.331 DQA : ±0.015

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LGE Internal Use Only

7. Component Video Input (Y, PB, PR)

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

1. 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)

2. 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)

3. 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I)

4. 720*480 31.47 59.94 27.000 SDTV 480P

5. 720*480 31.50 60.00 27.027 SDTV 480P

6. 720*576 31.25 50.00 27.000 SDTV 576P

7. 1280*720 44.96 59.94 74.176 HDTV 720P

8. 1280*720 45.00 60.00 74.250 HDTV 720P

9. 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz

10. 1920*1080 33.72 59.94 74.176 HDTV 1080I

11. 1920*1080 33.75 60.00 74.250 HDTV 1080I

12. 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,

13. 1920*1080 67.5 60.00 148.5 HDTV 1080P

14. 1920*1080 56.25 50 148.5 HDTV 1080P 50Hz

8. RGB Input ( PC )

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

1 720*400 31.469 70.08 28.32 DOS

2. 640*480 31.469 59.94 25.17 VESA(VGA)

3 640*480 37.500 75.00 31.50 VESA(VGA)

4 800*600 37.879 60.31 40.00 VESA(SVGA)

5 800*600 46.875 75.00 49.50 VESA(SVGA)

6 1024*768 48.363 60.00 65.00 VESA(XGA)

7 1024*768 56.476 70.06 75.00 VESA(XGA)

8 1024*768 60.023 75.02 78.75 VESA(XGA)

9 1280*768 47.693 59.99 80.125 WXGA(42XGA,50",60")

10 1360*768 47.700 60.00 84.62 WXGA(42XGA,50",60")

11 1366*768 47.700 60.00 84.62 WXGA(42XGA,50",60")

9. HDMI Input ( PC )

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

1 720*400 31.469 70.08 28.32 DOS

2 640*480 31.469 59.94 25.17 VESA(VGA)

3 640*480 37.500 75.00 31.50 VESA(VGA)

4 800*600 37.879 60.31 40.00 VESA(SVGA)

5 800*600 46.875 75.00 49.50 VESA(SVGA)

6 1024*768 48.363 60.00 65.00 VESA(XGA)

7 1024*768 56.476 70.06 75.00 VESA(XGA)

8 1024*768 60.023 75.02 78.75 VESA(XGA)

9 1280*768 47.693 59.99 80.125 WXGA(42XGA,50",60")

10 1360*768 47.700 60.00 84.62 WXGA(42XGA,50",60")

11 1366*768 47.700 60.00 84.62 WXGA(42XGA,50",60")

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LGE Internal Use Only

10. HDMI input ( DTV )

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

1. 720*480 31.47 59.94 27.000 SDTV 480P

2. 720*480 31.50 60.00 27.027 SDTV 480P

3. 720*576 31.25 50.00 27.000 SDTV 576P

4. 1280*720 44.96 59.94 74.176 HDTV 720P

5. 1280*720 45.00 60.00 74.250 HDTV 720P

6. 1280*720 37.50 50.00 74.25 HDTV 720P 50H

7. 1920*1080 33.72 59.94 74.176 HDTV 1080I

8. 1920*1080 33.75 60.00 74.250 HDTV 1080I

9. 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz

10. 1920*1080 67.5 60.00 148.5 HDTV 1080P

11. 1920*1080 56.25 50 148.5 HDTV 1080P 50Hz

No Item Content Remark

1. Product Dimension Width Length Height Unit

Before Packing 1033 288 750 mm SET(With Stand)

After Packing 1119 374 858 mm

2. Product Weight Only SET 29 Kg

With BOX 31 Kg

No Item Content Remark

1. Product Dimension Width Length Height Unit

Before Packing 811 235 630 mm SET(With Stand)

After Packing 896 300 720 mm

2. Product Weight Only SET 22 Kg

With BOX 25.5 Kg

12. Mechanical Spec - 37LB5RT

11. Mechanical Spec - 42LB5RT

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LGE Internal Use Only

ADJUSTMENT INSTRUCTION

1. Application Range

This spec. sheet is applied to all of the LP7BA chassis(Saturn Analog DVR) manufactured at LG TV Plant all over the world. Ex.) LP7BA: 32/37/42LB5RT-TB, 32/37/42LT81-ZF,

32/42LB9RT-MA

2. Specification

2.1 Because this is not a hot chassis, it is not necessary to use an isolation transformer.

However, the use of isolation transformer will help to protect test instruments.

2.2 Adjustment must be done in the correct sequence.

2.3 The adjustment must be performed at 25±5°C temperature and 65±10% relative humidity if there is no specified designation.

2.4 The input voltage of the receiver must be kept between 100~220V, 50/60Hz.

2.5 Before adjustment, execute Heat-Run for 30 minutes at RF no signal.

3. PCB assembly adjustment items

* Channel memory

- Download the channel data from BOM to EEPROM by using LGIDS.

* Option adjustment following BOM

- Tool Option1

- Tool Option2

- Area Option

(Fig.1)

1) Push the ADJ key in the Adjust Remocon.

2) Input the Option Number that was specified in the BOM, into the Shipping area.

3) Select "Tool Option1/ Tool Option2/ Area Option" by using

▲

/▼(CH+/-) key , and press the number key(0~9)

consecutively

ex) If the value of Tool Option1 is 7, input the data using

number key "7" (Fig. 1)

4. SET assembly adjustment items

●Auto AV Color Balance

●Adjustment of White Balance

●Auto Component Color Balance adjustment

- Standard equipment : MSPG925FA

●Auto RGB Color Balance adjustment

- Standard equipment : MSPG925FA

(At DVR model Case, Please check DVR function like

following list )

●Checking DVR Function and HDD

◈Check DVR Function as follow on 4.2 and find HDD failure

under malfunction.

5. HDD Assembly Adjustment method

5.1. HDD FORMAT

1) Assemble MAIN , DVR Board.

2) HDD Format in progress words will create automatically.

3) Please, wait for 30~40 seconds.

5.1.1. HDD Format in progress

5.1.2. HDD Format completed

5.2. Sub Program Download for "DVR" by using USB memory stick

1) connect USB memory stick to SET

2) Set power off -> ON

- DVR s/w will be installed automatically

LP7BA LPL 42 Normal S/W Version X.XX DVR Version X.XX UTT XX hr Tool Option1 7 Tool Option2 161 Area Option 16

:

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LGE Internal Use Only

6. EDID

● Caution

* Use the proper signal cable for EDID Download

- Analog EDID : Pin3 exists

- Digital EDID : Pin3 exists

=> Caution : - Never connect HDMI & DVI-D & DVI-A Cable

at the same time.

- Use the proper cables below for EDID Writing

6.1. Data

6.1.1 ANALOG(256 Bytes )

● BLOCK1 (128BYTE)

6.1.2 HDMI(256 Bytes )

● BLOCK1 (128BYTE)

● BLOCK2 (128BYTE)

7. ADC Calibration

=> Caution : - System control RS-232 Host should be "PC"

for adjustment. Press the FRONT-AV KEY on R/C for converting input mode. (change RS-232 Host : pc, Band Rate : 115200bps)

7.1 Adjustment of RF/AV/S-VIDEO * Required Equipments

- Remote controller for adjustment

- 802F Pattern Generator, Master (MSPG-925FA), etc.

- MSPG-925FA Pattern Generator

(Which has Video Signal: 100% Color Bar Pattern

shown in Fig. 2)

=> Model: 202 / Pattern : 65

(Fig. 2)

7.1.1 Method of Auto RF/AV/S-VIDEO Color Balance.

1) Press the FRONT-AV KEY on R/C for converting input

mode.

2) Input the Video Signal: 100% Color Bar signal into AV

3) Set the PSM to Dynamic mode in the Picture menu.

4) Press INSTART key on R/C for adjustment.

5) Press the ▶(Vol. +) key to operate the set, then it

becomes automatically

6) Auto-RGB OK means the adjustment is completed

7.1.2 Requirement

- This AV color balance adjustment should be performed

before White Balance Adjustment.

- After AV color balance adjustment, Change the mode

from AV to RF.

(Cancel Heat-run mode.)

ADC RF/AV/S-VIDEO Component RGB

MSPG925FA PAL NTSC Model:217 720P Model: 60

INPUT AV3-ZF VIDEO1 -MA Pattern:65 1024*768 60Hz

SELECT

AV1-TB

* 100% Color Bar

Pattern: 65

Model: 202 Model:201

* 100% Color Bar

(PAL-BGDHI) (NTSC)

Pattern: 65 Pattern: 65

* 100% Color Bar * 100% Color Bar

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LGE Internal Use Only

7.2 Adjustment of Component. * Required Equipments

- Remote controller for adjustment

- 802F Pattern Generator, Master (MSPG-925FA), etc

- MSPG-925FA Pattern Generator

(Which has 720p@60Hz YPbPr signal : 100% Color

Bar Pattern shown in Fig. 3 )

=> Model: 217 / Pattern: 65

- It is very import to use correct adjustment pattern like

Fig.3.

a. Within the pattern, color sequence should be aligned : White-Yellow-Cyan-Green-Magenta-Red-BLUE-

BLACK

(If color sequence is reversed (Black -> …-> White),

reverse the pattern with REV key, when using Master pattern generator like MSPG-925)

b. If Minimum Black Level and/or Maximum White Level

is not correct, Do select 100% Color Bar Pattern.

(Fig. 3)

7.2.1 Method of Auto Component Color Balance

1) Input the Component 720p 100% Color Bar(MSPG-

925FA model:217, pattern:65) signal into Component.

(MH : component 1 )

2) Set the PSM to Dynamic mode in the Picture menu

3) Press the INSTART key on R/C for adjustment

4) Press the ▶(Vol. +) key to operate the set, then it

becomes automatically

5) Auto-RGB OK means the adjustment is completed

7.3 Adjustment of RGB * Required Equipments

- Remote controller for adjustment

- 802F Pattern Generator, Master (MSPG-925FA), etc

- MSPG-925FA Pattern Generator (Which has XGA [1024*768] 60Hz PC Format output

signal : 100% Color Bar Pattern shown in Fig. 4 )

- It is very import to use correct adjustment pattern like

Fig. 4.

a. Within the pattern, color sequence should be aligned

: White-Yellow-Cyan-Green-Magenta-Red-BLUE-

BLACK

(If color sequence is reversed (Black -> …-> White),

reverse the pattern with REV key, when using Master pattern generator like MSPG-925)

b. If Minimum Black Level and/or Maximum White Level

is not correct, Do select 100% Color Bar Pattern

(Fig. 4)

7.3.1 Method of Auto RGB Color Balance

1) Input the PC 1024x768 @ 60Hz with 100% color bar

pattern like Fig.4. into RGB.

(Ex. MSPG-925FA, model:60, pattern:65)

2) Set the PSM to Dynamic mode in Picture menu

3) Press the INSTART key on R/C for adjustment

4) Press the ▶(Vol. +) key operate To set , then it

becomes automatically

5) Auto-RGB OK means adjustment is completed

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LGE Internal Use Only

8. White Balance

* Caution : Before White-balance, the AV ADC should be done.

=> Notice

- Do the white balance adjustment under the 10LUX

- Before white balance, press the In-start key 2times and do the reset like Fig.5

- Use the Torino inner pattern(216 gray pattern)

- To enter White-balance mode,press the IN-START key 2times.

* Caution : - System control RS-232 Host should be "PC" for

adjustment.

(Fig. 4)

* Test Equipment

LCD : Color Analyzer ( CA-110), PDP : Color Analyzer (CA-

100) CA-210 : The both of LCD and PDP are available. PC (for communication through RS-232C) -> UART Baud rate : 115200 Pattern Generator (MSPG-925FA etc. )

* Color Temperature & Color Coordinates Setting

When adjusting the Color Temperature of LCD, Color AnalyzerCA-210(Matrix should be corrected through CH9 of CS-1000) should be used. When adjusting the Color Temperature of PDP, Color AnalyzerCA-210(Matrix should be corrected through CH10 of CS-1000) should be used. Adjust the Color Temperature based below adjustment color coordinates. Even if CH9 of CA-210 is corrected with Matrix, there may be many character of Module and Filter. Therefore Refer to the below Color Coordinates Target. But, in case of WCG module, use the CH12 of CA-210.

White Balance(Hex)

Color Temp. Cool Red Gain. 80 Green Gain. 80 Blue Gain. 80 Red Offset 80 Green Offset 80 Blue Offset 80 Reset _ To set

- 14 -

LGE Internal Use Only

TROUBLESHOOTING

1. No power

Symptom

1) Minute discharge doesn't occur at module.

2) Front LE D does n't come into action.

Start check

Is inserted a pl ug

in power cord?

Is connected the Line

Filter and PSU?

Is normal the fuse of

PSU? Plasma (F101),

LC D (F111 )

Plug in a power cord

Connect a cable.

Plasma (E L1 1), LC D(SC100 )

Replace the fuse

Is it connected that

PSU and 13 p in cable

in VSC board ?

Connect the 13pin cable.

YE S

NO

After remo ve a ll cab les con nec ted to

PSU (except the C N101) , author izes the AC

vo ltage marking on manual.

When ST-by 5V doesn't ope rate , rep lace PSU

- 15 -

LGE Internal Use Only

Symptom

1) After once shining, it doesn't discharge minutely from module.

2) The rel ay fall s. ( Th e sound is audible "Click")

3) It is converted with the c o lor wh ere the front LED is red from gr een .

2. Protection mode

Start check

Is the PSU

no rm al?

Is the each

connector norma l?

Is t he Y- Board

no rm al ?

Is output the no rm ality Lo w /H igh

Voltage except Stand-by 5V?

Replace the power board

After connecting we ll each

connector the normality it operates?

Replace the power board

Is no rm al the output voltage after

remove P1 connector of Y-B/D?

Replace Y-B/D

Is no rm a l the fuse

(F S2 ,F S3 ) on Y -B/D?

Replace the fuse

Is the Z - Board

no rm al ?

Is no rm al the output vo ltage after

remove P1 connector of Z -B/D?

Replace Z -B/D

Is no rm a l the fuse

(F S1 ,F S2 ) on Z -B/D?

Replace the fuse

Is t he X- Bo ard

no rm al ?

After remove P100,110 output voltage norma lity:

Re place Ri ght X-B/ D

Afte r re mo ve P200,210 output voltage norm ality:

Replace Left X- B/D

Is norm a l the output vo ltage

after re move P100,110,200, 210

connector of X- B/D?

YE S

NO

- 16 -

LGE Internal Use Only

3. No Raster

Sy mptom

1) No OSD and image occur at scr een.

2) It maintains the condition where the front L ED is green

Start check

Is the link cable

norm al?

Reconnect the link cable

in P600

NO

Is the IC700's

output norm al?

NO

Replace the VSC

Does minute

discharge at

Module?

NO

Is the

inverter/ VaV s

on?

Check the PDP/LC D Module

Is output the norm ality Lo w /H igh

Voltage except Stand-by 5V?

Replace

the power boa rd

YE S

NO

- 17 -

LGE Internal Use Only

4. In case of becomes unusual display from RF mode(Main)

A

Is normal video output

of the Tuner?

(Check TU200_Pin14)

Is normal the I2C communication ?

(Check Pin5, Pin4)

Is normal the Input voltage ?

(Check L308)

Is normal the Input voltage ?

(Check Pin8, Pin6)

Is normal video

output

of CXA2069Q?

(Check R324, In case of S-Video

check R324, R328)

Is the Tuner Cable

connected well?

Change the TunerCheck the powerCable inserts well.

Is normal the

I2C communication ?

(Check R309, R310)

Change the IC(IC300)

Check the power

( Check L1004)

Change the IC(IC700)

Is the LVDS Cable

connected well?

Cable inserts well

NO NO NO

YE S

NO YE S YES

YE S

NO

NO NO

NO

- 18 -

LGE Internal Use Only

5. In the case of becomes unusual display from rear AV mode(main)

6. In the case of becomes unusual display from rear S-Video mode(main)

7. In the case of becomes unusual display from side AV mode(main)

Is normal video input

of the A/V jack?

Is normal video input

of the A/V jack?

Is normal video input

of the A/V jack?

Check the input source

Same as Block A

Check the input source

YES

NO

YES

NO

YES

NO

- 19 -

LGE Internal Use Only

8. In the case of becomes unusual display from side S-Video mode(main)

9. In the case of becomes unusual display from SCART 1 mode(main)

10. In the case of becomes unusual display from SCART 1_RGB mode(main)

Is normal video input

of the A/V jack?

(Check R339, R341, L310)

Check the input source

Is normal video input

of the A/V jack?

(Check L111, L112, L106)

Is normal video input

of the A/V jack?

(Check R102)

Same as Block A

Check the input source

Same as Block A

YES

NO

YES

NO

YES

NO

- 20 -

LGE Internal Use Only

11. In the case of becomes unusual display from SCART 2 mode(main)

12. In the case of becomes unusual display from SCART 2_YC mode(main)

Is normal video input

of the A/V jack?

(Check R115)

Check the input source

Is normal video input

of the A/V jack?

(Check R115, R149)

Check the input source

Same as Block A

YES

NO

YES

NO

- 21 -

LGE Internal Use Only

13. In case of becomes unusual display from RF mode(Sub)

Is normal video output

of the Tuner?

(Check TU201_Pin14)

Is normal the I2C communication ?

(Check Pin5, Pin4)

Is normal video

output

of CXA2069Q?

(Check R312, In case of S-Video

check R312, R314)

Is the Tuner Cable

connected well?

Is normal the Input voltage ?

(Check Pin8, Pin6)

Is normal the Input voltage ?

(Check L308)

Is normal the

I2C communication ?

(Check R309, R310)

Change the IC(IC300)

Check the power

( Check L1004)

Change the IC(IC700)

Is the LVDS Cable

connected well?

Cable inserts well

Change the Tuner

Check the power

( L1103)

Cable inserts well.

B

NO

NO NO

NO NONO

NO

YES

YES YES

14. In case PIP doesn't display from other modes(Sub)

Same as the case of main except block A should be change to B

- 22 -

LGE Internal Use Only

15. In case of becomes unusual display from component1 mode(main/sub)

16. In case of becomes unusual display from component 2 mode(main/sub)

17. In case of becomes unusual display from RGB mode(main/sub)

Is normal video

input

of the JK102?

(Check L126, L127, L128)

Check the input source

Is normal video

input

of the JK103?

(Check L129, L130, L131)

Is normal R, G, B input

and H,V sync of the JK500?

(Check R509, R511, R512

R513, R515)

Check the input source

Change IC(IC700)

YES

NO

YES

NO

YES

NO

- 23 -

LGE Internal Use Only

Symptom

LED is Green

Sc r een i s ex istent, but sound isn't

Check f ollow

18. No Sound

All input (mode)

is no sound?

Is the speaker

on in menu?

Is the speaker

cable normal?

IC400 operate

normally?

Set on speaker

in menu

Check the

Speaker cable

Replace IC400

IC401 operate

normally?

Replace IC401

IC402 operate

normally?

Replace IC402

Replace VSC B/D

Only HDMI is

no Sound?

Download the EDID data

Only AV input is

no Sound?

Is the output

of IC300(pin52,53)

normal?

Check the signal

after IC300

refer to circuit diagram

Replace IC300

Only RF is

no Sound?

Check the Tuner In/Out

YES

NO

NO NO

NO

- 24 -

LGE Internal Use Only

No

Is normal on ly video ?

Is norm al on ly aud io?

Check TMDS line wave.

(R 1215 ~ R1222/ R1226 ~ R1233)

Down load EDID data each port.

1. Check TV input mode.

(H DMI1 port support HDMI and DVI.

So if you inpu t D V I s igna l and PC aud io fro m phone jac k ,

You can hear PC audio . )

2. Unpl ug and plug HDMI ca ble.

(som etimes ESD surge occurred a t HDMI port.)

3. Check HDMI Mute register. (0x 68, offset 0x37)

4. Check Audio- ou t channe l mute reg ister (0 x68 , offse t 0x32)

is appropriately enabled .

Check HDMI source . Change another source or cab le.

Is wave continuous?

1. Check H D MI re ce iver's status reg ister. (0x60, offset 0 x06)

- If the value is 0xf or 0x 8, it is n

o

rmal.

2. Check HD CP reg iste r. (0 x60, offset 0x32 )

- Enabl e bit 6: HDCP key loaded

- En ab le bit 5: HDCP decryption active

- En ab le bit 4: HDCP authen. attempted

No

Replace IC1200

Reset TMDS power down /on register .

- 0 x6 0, offse t 0x 3f : 0xf 7 => 0xff

Yes

Norma l video ,

Norma l aud io?

Yes

No

19. HDMI mode

- 25 -

LGE Internal Use Only

20.1 DVR

Start check

Is Timeshift M ode "On"

in

Menu?

Is connected cable?

(P1300, P1302 )

Is operated

IC1300,IC1302

normally?

Change Timesh ift Mode

from off to "On"

Connect a cable.

P1300, P1302

Replace the IC1300, IC1302

YE S

NO

Sympto m

L ED is Green

Doesn't work time shift m ode.

Can't enter to recorded list

Can't record AV/RF/Component

Check f ollow

Is

operated

IC1500, IC150

1

normally?

Replace the IC1500, IC1501

Change HDD

YE S

- 26 -

LGE Internal Use Only

BLOCK DIAGRAM

MEMO

- 27 -

LGE Internal Use Only

- 28 -

LGE Internal Use Only

120

122

120

121

520

510

910

900

500

300

200

802

807

809

820

840

830

804

530

600

610

400

800

803

805

806

801

200T

200N

EXPLODED VIEW

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 X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer.

IMPORTANT SAFETY NOTICE

LGE Internal Use Only

LG 42LB5RT-TB Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual