LG RZ-42LZ30 Schematic

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : ML-038C

MODEL : RZ-42LZ30

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

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CONTENTS

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

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

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

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

SVC REMOCON.......................................................................................11

TROUBLE SHOOTING............................................................................12

BLOCK DIAGRAM...................................................................................16

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

EXPLODED VIEW PARTS LIST..............................................................19

REPLACEMENT PARTS LIST ................................................................20

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

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 X-RADIATION, 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.

Due to high vacuum and large surface area of picture tube, extreme care should be used in handling the Picture Tube. Do not lift the Picture tube by it's Neck.

X-RAY Radiation

Warning:

To determine the presence of high voltage, use an accurate high impedance HV meter.

Adjust brightness, color, contrast controls to minimum. Measure the high voltage. The meter reading should indicate

23.5

1.5KV: 14-19 inch, 26 1.5KV: 19-21 inch,

29.0

1.5KV: 25-29 inch, 30.0 1.5KV: 32 inch If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

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

The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued X-RAY RADIATION protection, the replacement tube must be the same type tube as specified in the Replacement Parts List.

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.

d. Discharging the picture tube anode.

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. Discharge the picture tube anode only by (a) first connecting

one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touch the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage.

4. Do not spray chemicals on or near this receiver or any of its

assemblies.

5. 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.

6. Do not defeat any plug/socket B+ voltage interlocks with which

receivers covered by this service manual might be equipped.

7. 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.

8. 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.

9. 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.

SERVICING PRECAUTIONS

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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.

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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1. Application range

This specification is applied to ML-038C chassis.

2. Requirement for Test

Testing for standard of each part must be followed in below condition.

(1) Temperature: 25°C ± 5°C (2) Humidity: 65% ± 10% (3) Power: Standard input voltage (AC 100-240V, 50/60Hz) (4) Measurement must be performed after heat-run more than

15min.

(5) Adjusting standard for this chassis is followed a special

standard.

3. Test and Inspection method

(1) Capacity: Follow LG electronics TV Testing Standard. (2) Another Required Standard EMI: Following CE Standard(EN55020) SAFETY: Following CB Standard(EN55013)

SPECIFICATION

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

4.General Specification

5 6 7 8 9 10 12

Video input applicable system

AV input system

Available channel

PC Signal Input (RGB Input)

Input Voltage Active Display Size Operating Temperature Operating Humidity Storage Temperature Storage Humidity LCD Panel

Lamp

Speaker

1)PAL/SECAM BG

2)PAL/SECAM DK

3)PAL I/I

4)SECAM L/L’

1)PAL

2)SECAM

3)NTSC 3.58/4.43

1)VHF : E2 ~ E12 UHF : E21 ~ E69 CATV : S1 ~ S20 HYPER : S21 ~ S41

2)L/L’ VHF: B,C,D

VGA SVGA XGA (1024 x 768)

AC 230V/ 50Hz,60HZ

42.02"

Temp : 0 ~ 40 deg Humidity: 85% Temp : -20 ~ 60 deg Humidity : 85% LC420W02 TFT Active Matrix LCD Panel 1006(H) x 610(V) x 59(D) mm 16:9 1366 x 768

0.227 x 0.681 x RGB

12kg CCFL(Cold Cathode Fluorescent Lamp) 20EA 50,000Hrs

Item Specification Remark

No.

Humidity: 50%(Temp: 40

Life Time: Until brightness of lamp goes to half of its initial brightness. (condition: continuous operating at 25

2 C)

Model Name Feature Outline Dimension Aspect Ratio Resolution Pixel Pitch Weight Backlight System Quantity Power Consumption Life Time Impedance

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5.Feature and Function

1 2 3

4 5 6 7 8 9 10 11

Remocon Code Local Key

OSD Language

Motion Detection Stereo Sound Dual Sound Teletext DW(Double Window) Mode Multi Picture Display Mode Progressive Scan

User Control

PSM CSM

Picture

CVBS,YC,480ISub - PIP

CVBS,YC, 480I

RGB, DVI ARC

Zoom Step

Display mode

- Main

LG Code Only MENU,

,PR , VOL ,TV · AV, OK, 0/I Colour Temperature Contrast Brightness Colour Tint Sharpness Dynamic / Standard / Mild /User Normal / Cool / Warm / User

(FLI2300) FM Stereo / Nicam Stereo FM Stereo / Nicam Stereo TOP, FLOP, LIST, 128 Page O 1 PIP O 16:9(FULL), 4:3, 14:9, Zoom(Letter Box) Auto ARC 16:9(FULL), 4:3 0 - 50

16:9(FULL), 4:3 English/French/Deutsch/Spanish/Italian

Item

Specification

Remark

No.

EU 8 Key Tint (NTSC Signal Only)

9,350 K / 13,500 K / 8,000K

Classified receiving broadcasting form

Flexible Window Size & Position

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1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20

Resoluton

640

350

640

350

720

400

720

400

640

480

640

480

640

480

800

600

800

600

800

600

800

600

800

600

800

600

1024

768

1024

768

1024

768

1024

768

1360

768

1366

768

832

624

H-freq(kHz)

31.468

37.861

31.469

37.927

31.469

37.861

37.500

35.156

37.879

48.077

46.875

53.674

64.016

48.363

56.476

60.023

68.677

47.7

60.15

49.725

V-freq(kHz)

70.09

85.08

70.08

85.03

59.94

72.80

75.00

56.25

60.31

72.18

75.00

85.06

100.00

60.00

70.06

75.02

84.99

60.00

75.00

74.55

Proposed Remark

EGA EGA DOS DOS VESA(VGA) VESA(VGA) VESA(VGA) VESA(SVGA) VESA(SVGA) VESA(SVGA) VESA(SVGA) VESA(SVGA) VESA(SVGA) VESA(XGA) VESA(XGA) VESA(XGA) VESA(XGA) GTF.(WXGA) GTF.(WXGA) Macintosh(16")

RGB 1 Only

Pixel clock

25.17

31.50

28.32

35.50

25.17

31.50

36.00

40.00

50.00

49.50

56.25

69.65

65.00

75.00

78.75

94.50

80.14

102.90

57.28

6. RGB 1 and RGB 2 Input Mode

Vertical Frequency: Standard

0.5Hz

Vertical Lines: Standard

7Lines

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ADJUSTMENT INSTRUCTION

1. Application Object

These instructions are applied to all of the MODELS of LCD MONITOR, ML038C.

2. Instruction

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 protect test instrument.

2-2. Adjustment must be done in the correct order.

But it can be changed in consideration of mass production.

2-3. 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.

2-4. The input voltage of the receiver must keep 220V,60Hz in adjusting.

Input voltage is possible from 100V to 264V . Adjustment should be

operated in 220V/60Hz if there is no specific designation.

2-5. The receiver must be operated for about 15 minutes prior to the

adjustment.

After receiving 100% White Pattern(06CH), the receiver must be operate

prior to the adjustment.(Or white condition in HEAT-RUN mode)

Enter into HEAT-RUN MODE

- Select ‘White’ by pressing ‘POWER ON’ key on SVC Communicator .

CAUTION) If you turn on a still screen more than 20 minutes, a afterimage

may be occur in the black level part of the screen

3. Adjustment

Caution) Each PCB Assy must be checked by Check JIG Set before

assembling.

(Be careful about power PCB ASSY which can give a fatal damage to the

LCD Module.)

3-1.White Balance Adjustment 3-1-1. Required Equipment

Color Analyzer ( CA-100 or same production )

3-1-2. Connection Diagram of Equipment for Measuring (Automatic

Adjustment)

- Connect RS-232C to Adjustment Equipment and SET.

- Automatization operating room has in charge of managing and repairing about adjusting equipment.

- Automatic adjustment equipment decides the value of R-GAIN/G-GAIN/BGAIN

by correcting color coordinates/white balance and transmits them into SET (Use the RS-232C) and finally the set saves data values.

3-1-2. White Balance Adjustment(Manual Adjustment)

Operate Zero Calibration of CA-100 and Sensor must be stick completely to the surface of LCD module. Divide Manual adjustment into AV/PC and operate adjustment by the following sequence.

Manual adjustment is a temporary method when automatic adjustment is

not correspondent.

(1)

Select WHITE PATTERN of HEAT RUN mode by pressing ‘POWER ON’ key on SVC Communicator and then operate HEAT RUN more than 15 minutes.

(2)

Supply pattern signal for WB adjustment in pattern generator.(External INPUT) (3) Low Light has no special adjustment. (4)

To adjust High Light, stick sensor to (2) pattern(White), and after select the R-H G-H by pressing ADJ button on SVC Communicator, press the Vol +/- Key and adjust it until color coordination becomes (B GAIN is fixed) Color coordination : X; 0.281

0.025 , Y; 0.283 0.025

Color temperature : 9,800

K 1,000 K.

(5) Exit adjustment mode using Enter button.

3-2.

EDID (The Extended Display Identification Data)/DDC(Display Data Channel) Adjustment

3-2-1. This is a function that is made for the realization of "Plug and Play" which

makes possible to use the user environment right after reorganization by communicating with monitor automatically.

3-2-2. EDID DATA for DVI of ML-038C(Data for DDC)

EDID Table=

3-2-2. EDID DATA for RGB of ML-038C

EDID Table=

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 00 00 FF FF FF FF FF FF 00 1E 6D D7 3A 01 01 01 01 10 33 0E 01 01 1E 5D 34 96 08 B7 FB A1 56 48 98 24 20 13 48 4B AF EF 80 31 40 31 59 3B D9 45 40 45 59 30 61 59 81 40 01 01 BC 34 00 98 51 00 2A 40 10 90 40 13 00 A2 0B 32 00 00 1E F9 15 20 F8 30 58 1F 20 50 20 40 13 00 A2 0B 32 00 00 1E 00 00 00 FD 00 38 60 55 1E 50 0E 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 52 5A 2D 34 32 4C 5A 33 30 20 20 20 20 00 8F

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 00 00 FF FF FF FF FF FF 00 1E 6D D7 3A 01 01 01 01 10 33 0E 01 01 81 5D 34 96 08 B7 FB A1 56 48 98 24 20 13 48 4B AF EF 80 31 40 31 59 3B D9 45 40 45 59 30 61 59 81 4F 71 59 30 2A 00 98 51 00 2A 40 30 70 40 13 00 A2 0B 32 00 00 18 1B 21 50 A0 51 00 1E 30 50 48 88 35 00 A2 0B 32 00 00 1E 00 00 00 FD 00 38 60 4B 1E 50 0E 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 52 5A 2D 34 32 4C 5A 33 30 20 20 20 20 00 DF

<Fig .1> Connection Diagram of Automatic Adjustment

RS-232C

Window

MASTER OR QUANTUM DATA

High Light

COLOR ANALYZER TYPE; CA-100

RGB Signal Input LCD TV

Model Name

ML-038C RZ-42LZ30

Title

115200

Index

R-H

Cmd1

Cmd2 Data Min.Value

Max.Value

G-H

R-Gain

G-Gain

100

Protocol

NONE

Baud rate Data bit Stop bit Parity bit

RS-232C

Communication

- 10 -

EDID ADJUSTMENT

Figure 1. Cable Connection

Windows EDID V1.0 User Manual

Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup

Windows 2000, XP => Need to Port Setup.

This program is available to LCD Monitor only.

1. Port Setup a) Copy “UserPort.sys” file to

“c:\WINNT\system32\drivers” folder

b) Run Userport.exe

c) Remove all default number d) Add 300-3FF

e) Click Start button. f) Click Exit button.

2. EDID Read & Write

1) Run WinEDID.exe

2) Edit Week of Manufacture, Year of Manufacture, Serial Number a) Input User Info Data b) Click “Update” button c) Click “ Write” button

Video Signal Generator

Control Line

IBM Compatible PC

Not used

RS232C

PARALLEL

VGS

MONITOR

POWER

V-SYNC

V-Sync On/Off Switch

220

Power LED

ST Switch

PARALLEL PORT

Power inlet (required)

Power Select Switch (110V/220V)

10 5

OFF ON

OFF

74LS06

4.7K

74LS06

4.7K

- 11 -

SVC REMOCON

1 POWER 2 POWER ON 3 MUTE

4 P-CHECK 5 S-CHECK 6 ARC 7 CAPTION 8 TXT 9 TV/AV 10 TURBO SOUND 11 TURBO PICTURE

12 IN-START

13 ADJ 14 MPX 15 EXIT 16 APC(PSM) 17 ASC(SSM) 18 MULTIMIDIA 19 FRONT-AV 20 CH 21 VOL 22 ENTER

23 PIP CH-(OP1)

24 PIP CH+(OP2)

25 PIP SWAP(OP3)

26 PIP INPUT(OP4)

27 EYE 28 MENU

29 IN-STOP 30 STILL

31 TIME

32 SIZE

33 MULTI PIP

34 POSITION

35 MODE 36 PIP 37 TILT 38 0~9

To turn the TV on or off To turn the TV on automatically if the power is supplied to the TV. (Use the POWER key to deactivate): It should be deactivated when delivered. To activate the mute function. To check TV screen image easily. To check TV screen sound easily To select size of the main screen (Normal, Spectacle, Wide or Zoom) Switch to closed caption broadcasting To toggle on/off the teletext mode To select an external input for the TV screen To start turbo sound To start turbo picture To enter adjustment mode when manufacturing the TV sets. To adjust the screen voltage (automatic): In-start

mute Adjust AV(Enter into W/B adjustment mode) W/B adjustment (automatic): After adjusting the screen W/B adjustment Exit two times (Adjustment completed) To enter into the adjustment mode. To adjust horizontal line and sub-brightness. To select the multiple sound mode (Mono, Stereo or Foreign language) To release the adjustment mode To easily adjust the screen according to surrounding brightness To easily adjust sound according to the program type To check component input To check the front AV To move channel up/down or to select a function displayed on the screen. To adjust the volume or accurately control a specific function. To set a specific function or complete setting. To move the channel down in the PIP screen. To use as a red key in the teletext mode To move the channel in the PIP screen To use as a green key in the teletext mode To switch between the main and sub screens To use as a yellow key in the teletext mode To select the input status in the PIP screen To use as a blue key in the teletext mode To set a function that will automatically adjust screen status to match the surrounding brightness so natural color can be displayed. To select the functions such as video, voice, function or channel. To set the delivery condition status after manufacturing the TV set. To halt the main screen in the normal mode, or the sub screen at the PIP screen. Used as a hold key in the teletext mode (Page updating is stopped.) Displays the teletext time in the normal mode Enables to select the sub code in the teletext mode Used as the size key in the PIP screen in the normal mode Used as the size key in the teletext mode Used as the index key in the teletext mode (Top index will be displayed if it is the top text.) To select the position of the PIP screen in the normal mode Used as the update key in the teletext mode (Text will be displayed if the current page is updated.) Used as Mode in the teletext mode To select the simultaneous screen To adjust screen tilt To manually select the channel.

Shortcut keys Shortcut keys Shortcut keys

Use the AV key to enter the screen W/B adjustment mode.

Shortcut keys Shortcut keys

Shortcut keys

- 12 -

TROUBLESHOOTING

No Power

(LED Indicator off)

Change IC1305

Change IC901, IC905

Change LED Ass'y

Check SMPS output

Check P201 Connector

Change SMPS Board

Check SMPS

Output

Stby 5V, Stby 3.3V,

18V, 3.3V

Fail

Check in

Input B+

IC901 & IC905

Fail Fail

Pass

Check IC1305

Check index

STBY 5V

(LED ASS'Y)

Fail

Pass

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No Raster

Check LED Status

Check inverter

connector

Fail

Pass

Fail

Check invert

connector

Check invert

Pass

Check invert

Pass

Check panel

Link cabel

Pass

Change panel

Link cabel

Pass

Check module

Check the

77, 76 of IC901

Pass

Change module

Fail

Change IC905

Change input source cabel and Jack

Check Output of

IC905

Pass

Check IIC ERROR of

IC901

Pass

Check IIC ERROR of

IC901

Fail

A:process

- 14 -

No Raster on AV signal

(Video, S-Video)

Repeat

A:Process

Check the out of

TU801

Fail

Pass

Fail

No Raster on TV(RF) signal

Check 5V, 33V of TU801

Re-soldering or

Change the defect part

Check the input

of IC1201

Fail

Pass

Check the C1238, C1240, C1243, C1236

Change the defect part

Check the in/output

of IC1201

Fail

Pass

Re-soldering or

Change the defect part

Check the

in/outputof IC401

Fail

Pass

Re-soldering or

Change the defect part

Check input source cabel and jack

- 15 -

No sound

Check the input

source

Fail

Pass

Change source input

Check the input

of IC1102

Check the pin 56, 57

of IC1102

Fail

Pass

Change the Defet part

Check the input

of IC1001, IC1002

Check the output

of IC1102

Pass

Fail

Pass

Change IC601

Check the R1144,

R1140

Fail

Change R1144, R1140

Check the output

of IC1001, IC1002

Fail

Pass

Change IC1001, IC1002

Check the

speaker

Fail

Pass

Change speaker

Check the speaker wire

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