LG 42LC2D Schematic

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Page 1

LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LD61C

MODEL : 42LC2D 42LC2D-FC

North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com

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CONTENTS

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

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

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

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

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

BLOCK DIAGRAM...................................................................................27

EXPLODED VIEW .................................................................................. 29

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

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SAFETY PRECAUTIONS

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

IMPORTANT SAFETY NOTICE

0.15uF

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CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the

SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the

following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First.

General Servicing Precautions

1. Always unplug the receiver AC power cord from the AC power source before; a. Removing or reinstalling any component, circuit board

module or any other receiver assembly.

b. Disconnecting or reconnecting any receiver electrical plug or

other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic

capacitor in the receiver. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc".

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

4. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol (90%-99% strength) CAUTION: This is a flammable mixture. Unless specified otherwise in this service manual, lubrication of contacts in not required.

5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped.

6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

7. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last.

8. Use with this receiver only the test fixtures specified in this

service manual.

CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the

unit under test.

2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static type solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500ºF to 600ºF.

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.

(500ºF to 600ºF) 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

(500ºF to 600ºF)

b. First, hold the soldering iron tip and solder the strand against

the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the

component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil.

d. Closely inspect the solder area and remove any excess or

splashed solder with a small wire-bristle brush.

SERVICING PRECAUTIONS

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IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.

Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC.

Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and solder it.

3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor Removal/Replacement

1. Remove the defective transistor by clipping its leads as close as possible to the component body.

2. Bend into a "U" shape the end of each of three leads remaining on the circuit board.

3. Bend into a "U" shape the replacement transistor leads.

4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection.

Power Output, Transistor Device Removal/Replacement

1. Heat and remove all solder from around the transistor leads.

2. Remove the heat sink mounting screw (if so equipped).

3. Carefully remove the transistor from the heat sink of the circuit board.

4. Insert new transistor in the circuit board.

5. Solder each transistor lead, and clip off excess lead.

6. Replace heat sink.

Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicular y to the circuit board.

3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder.

Fuse and Conventional Resistor Removal/Replacement

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

2. Securely crimp the leads of replacement component around notch at stake top.

3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).

1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary).

2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.

3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.

4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.

1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens.

2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.

3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.

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SPECIFICATION

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

1. General Specification(TV)

No Item Specification Remark

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

NTSC 4.43

2. Receivable Broadcasting System 1) PAL/SECAM BG EU/Non-EU

2) PAL/SECAM DK (PAL Market)

3) PAL I/I

4) SECAM L/L'

5) PAL-N/M Central and South America Market

6) NTSC M

3. RF Input Channel VHF : E2 ~ E12 PAL

UHF : E21 ~ E69

CATV : S1 ~ S20

HYPER : S21~ S47

L/L' : B, C, D FRANCE

VHF : 2~13 NTSC

UHF : 14~69

CATV : 1~125

VHF Low : 1 ~ M10 JAPAN

VHF High : 4~S22

UHF : S23~62

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

5. Market France

6. Picture Size 1067.308(diagonal) 42 inch

7. Tuning System FVS 100 program PAL, 200 PR.(Option)

FS NTSC

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

2) Humidity : 10~90 %

9. Storage Environment 3) Temp : -20 ~ 50 deg

4) Humidity : 10~90 %

10. Display LCD Module LPL

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2. General Specification

No Item Specification Remark

1 Panel 42" 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 1 : Y Middle east / NTSC Area

3 : Pb

5 : Pr

5 H/V-Sync Video Power consumption LED

Power ON - -

≤ 240W(42")

Green

Stand by

≤ 3.0W

Red

Power off - - - *

6 LCD Module Type Size 42” 1006 x 610 x 56(mm) (H) x (V) x (D)

Pixel Pitch 42” 0.227 x 0.681 x RGB µm

Pixel Format 1366 horiz. By 768 vert.

Pixels RGB strip arrangement

Coating Hard coating(3H), Anti-glare

reatment of the front polarizer,

Back Light 42" 20CCFL

No Item Specification Min. Typ. Max. Remark

1 Viewing Angle <CR>10> R/L, U/D 178, 178

2 Luminance Luminance(cd/m

) 400 500 32/37/42

Variation 1.3 MAX/MIN

3 Contrast Ratio CR 400 550 All White/All Black

D(With AL) 800 1100 All White/All Black

4 CIE Color Coordinates White Wx Typ 0.281 Typ LPL(42")

Wy -0.03 0.293 +0.03

Red Xr 0.639

Yr 0.340

Green Xg 0.284

Yg 0.604

Blue Xb 0.145

Yb 0.064

3. Optical Feature(LCD Module)

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

1 720x576 31.25 50.00 SDTV 576p 50Hz

2 720x480 31.47 59.94 SDTV 480p 60Hz

3 1280x720 45.00 50.00 HDTV 720p 50Hz HDCP

4 1280x720 44.96 59.94 HDTV 720p 60Hz HDCP

5 1920x1080 28.13 50.00 HDTV 1080i 50Hz HDCP

6 1920x1080 33.72 59.94 HDTV 1080i 60Hz HDCP

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4. Component Video Input (Y, P

B, PR)

No.

Specification

Remark

Resolution H-freq(kHz) V-freq(Hz)

1. 720x480 15.73 60 SDTV, DVD 480i

2. 720x480 15.63 59.94 SDTV, DVD 480i

3. 720x480 31.47 59.94 EDTV 480p

4. 720x576 15.625 50.00 SDTV, DVD 625 Line

5. 720x576 31.25 50.00 HDTV 576p

6. 1280x720 45.00 60.00 HDTV 720p

7. 1280x720 44.96 59.94 HDTV 720p

8. 1920x1080 31.25 50.00 HDTV 1080i

9. 1920x1080 33.75 60.00 HDTV 1080i

10. 1920x1080 33.72 59.94 HDTV 1080i

5. RGB PC INPUT Mode Table

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

Analog RGB, Digital RGB

1 720x400 31.468 70.8 28.321

2 640x480 31.469 59.94 25.17 VESA

37.684 75.00 31.5 VESA

3 800x600 37.879 60.31 40.00 VESA

46.875 75 49.5 VESA

4 832x624 49.725 74.55 57.283

5 1024x768 48.363 60.00 65.00 VESA(XGA)

56.47 70.00 75.00 VESA(XGA)

60.123 75.029 78.75 VESA(XGA)

6 1280x768 47.776 59.870 79.50 VESA(WXGA)

7 1360x768 47.720 59.799 84.75 VESA(WXGA)

8 1366x768 47.720 59.799 84.75 Supported

6. RGB DTV INPUT Mode Table

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7. HDMI INPUT Mode Table

8. HDMI DTV Mode Table

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

Analog RGB, Digital RGB

1 720x400 31.468 70.8 28.321

2 640x480 31.469 59.94 25.17 VESA

37.684 75.00 31.5 VESA

3 800x600 37.879 60.31 40.00 VESA

46.875 75 49.5 VESA

4 832x624 49.725 74.55 57.283

5 1024x768 48.363 60.00 65.00 VESA(XGA)

56.47 70.00 75.00 VESA(XGA)

60.123 75.029 78.75 VESA(XGA)

6 1280x768 47.776 59.870 79.50 VESA(WXGA)

7 1360x768 47.720 59.799 84.75 VESA(WXGA)

8 1366x768 47.720 59.799 84.75 Supported

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

1 720x576 31.25 50.00 SDTV 576p 50Hz

2 640x480 31.5 59.94/60 SDTV 480p 60Hz

3 720x480 31.47 59.94/60 SDTV 480p 60Hz

4 1280x720 45.00 50.00 HDTV 720p 50Hz HDCP

5 1280x720 44.96 59.94/60 HDTV 720p 60Hz HDCP

6 1920x1080 28.13 50.00 HDTV 1080i 50Hz HDCP

7 1920x1080 33.72 59.94/60 HDTV 1080i 60Hz HDCP

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ADJUSTMENT INSTRUCTION

1. Application Range

This spec. sheet is applied to all of the LD61C chassis manufactured at LG TV Plant all over the world.

2. Specification.

(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) Adjustment must be done in the correct sequence. (3) The adjustment must be performed at 25±5°C temperature

and 65±10% relative humidity if there is no specified designation.

(4) The input voltage of the receiver must be kept between

100~220V, 50/60Hz.

(5) Before adjustment, execute Heat-Run for 30 minutes at RF

no signal.

3. Channel Memory

3.1. Setting up the LGIDS

1) Install the LGIDS

2) After installation, restart your PC.

3) Extract [files.zip] to folder [c:\LGIDS\files]

4) Start LGIDS.

3.2. Channel memory method

1) Press TILT key in Adjust remocon(Automatic setting).

2) Setting up like bottom figure (Confirmation: Press ADJ Key in the Adjust remocon. Select "System Control" by using D/E (CH+/-) key, and press A (ENTER))

3) Connect RS232 cable .(Use the general RS-232C Twisted

Serial Cable).

4) Operate LGIDS

5) Select "Hurricane" and "ALL" on Model dialog and check

your connection in Communication dialog.

(If your connection is ‘NG’, then set your PORT(COM1,2,3,…)

correctly. If your connection has completed, you can see

)

6) Select proper CH_memory file(*.nvm) for each model at [Channel Download] => [Write Batch]. Next, select proper binary file(*.bin) including the CH information for each model at

[Channel Download] => [NVRAM File].

7) Click the [Download] button.

It means the completion of the CH memory download if all

items show 'OK' and Status is changed by 'PASS' at the lower right corner of the window

4. Hudson Download

4.1 Hudson Download method

1) Press TILT key in Adjust remocon(Automatic setting).

2) Setting up like bottom figure

(Confirmation: Press ADJ Key in the Adjust remocon. Select "System Control" by using D/E (CH+/-) key, and press

A (ENTER))

Ready

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3) Connect RS232 cable(Use Download Jig and general RS232C Twisted Serial Cable).

*Before upgrading "Hudson flash memory", push the switch

on the download jig ‘inside’.

4) Operate LGIDS.

5) Select "Hurricane" and "ALL" on Model dialog and check your connection in Communication dialog.

(If your connection is ‘NG’, then set your PORT (COM1, 2,

3,…) correctly. If your connection has completed, you can

see )

6) First, select proper Batch file(*.flm) for each model at [ROM Download] => [Batch File]. Second, select proper RAM file(*.hex) for each model at [ROM Download] => [RAM File]. Third, select roper Flash File(*.hex) for each model at [ROM Download] => [Flash File].

7) Click the [Download] button. It means the completion of the Hudson download if all items show 'OK' and Status is changed by 'PASS' at the lower right corner of the window.

Before AV ADC Calibration, should be executed the

"Panel size selection

5. Select method of Panel size

5.1 Press ADJ Key in the Adjust remocon

5.2 Select "Panel Control" by using

D/E (CH+/-) key, and

press

A (ENTER)

5.3 Select "Panel Size", and change the panel size among 32, 37, 42 according to the inch of model name.

(If the model name is 37LC2D-EC, change the Panel size from default value to 37.)

5.4 After changing the panel size, push the EXIT Key

6. ADC Calibration

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

adjustment.

Before AV ADC Calibration, execute the "Panel size

selection"

Ready

ADC RF/AV/S-VIDEO Component RGB-PC

MSPG925F PAL Model:217 (720P) Model: 37

INPUT SELECT AV4 Pattern:33 (1024*768

Model: 202 (PAL-BGDHI) 720P/60Hz 100% 60Hz)

Pattern: 33 Color Bar Pattern: 33

PAL 100% Color Bar

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

- Remote controller for adjustment

- MSPG-925F Pattern Generator (Which has Video Signal: 100% Color Bar Pattern shown in Fig. 1) => Model: 202 / Pattern: 33

Case1) EC and FC model use PAL-BGDHI (composite signal)

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

1) Input the Video Signal: 100% Color Bar signal into AV4

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

[Fig.1]

3) Press IN-START key on R/C for adjustment.

4) Press the G(Vol.+) key to operate the set, then it becomes automatically.

5) Auto-RGB OK means the adjustment is completed.

6.2 Adjustment of Component.

* Required Equipments

- Remote controller for adjustment

- l MSPG-925F Pattern Generator => Model: 217/Pattern: 33 (Which has 720p/60Hz YPbPr output Pattern shown in Fig. 2 )

6.2.1 Method of Auto Component Color Balance

1) Input the Component 720p/60Hz 100% Color Bar(MSPG925F model:217, pattern:33) signal into Component.

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

[Fig.2]

3) Press the IN-START key on R/C for adjustment.

4) Press the G(Vol.+) key to operate the set , then it becomes automatically.

5) Auto-RGB OK means the adjustment is completed.

6.3 Adjustment of RGB * Required Equipments

- Remote controller for adjustment

-l MSPG-925F Pattern Generator

(Which has XGA [1024*768] 60Hz 100% Color Bar pattern

shown in Fig. 3)

6.3.1 Method of Auto RGB Color Balance

1) Input the PC 1024x768@60Hz 100% Color Bar pattern (MSPG-925F model:37, pattern:33) into RGB. (Using D-sub to D-sub cable)

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

3) Press the IN-START key on R/C for adjustment

[Fig.3]

4) Press the G(Vol.+) key operate To set , then it becomes automatically.

5) Auto-RGB OK means adjustment is completed.

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

7. White Balance

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

adjustment.

- AV ADC should be done before White-balance.

* Test Equipment

Color Analyzer ( CA-110) PC (for communication through RS-232C) => UART Baud rate : 115200 Pattern Generator (MSPG-925F)

* Target Value (PSM: Dynamic, CSM: Normal)

- Normal(9300K) x:0.283±0.003, y: 0.298±0.003

- Luminance(Y) AV/COMP: 250 Cd/m2 (Typ: 300 Cd/m2) PC : 300 Cd/m2 (Typ: 350 Cd/m2)

-> Reference Value(Automatically fixed)

- Cool(11000K) - x: 0.274±0.003, y: 0.286±0.003

- Warm(7200K) - x:0.303±0.003, y: 0.319±0.003

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Only for training and service purposes

White balance AV4

MSPG925F High Model : 202

*239Gray Pattern : 47

*Pal Video

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6. Shipping Conditions

No Item Condition Remark

1 Power Off

2 Volume Level 30

3 Main Picture Input TV

4 Main Last Channel Pr 01

5 Mute Off

6 ARC 16 : 9

7 Station Auto Program

Manual Program

Program Edit

Favorite Program None

8 Picture PSM Dynamic

Dynamic Contrast 100

Brightness 45

Colour 50

Sharpness 50

CSM Normal ZE(TE)

XD On

ACM Fleshtone : 1

Greentone : 1

Bluetone : 1

9 Sound SSM Flat

BBE Off

AVL Off

Balance 0

Treble 50

Bass 50

TV Speaker On

10 Time Clock -- : -- User control

Off time Off

On time On

Auto sleep Off

11 Special Language English

Area Management

Child Lock Off

Set ID 1

XD Demo To Start

Logo light On

Index On

12 Screen Auto config

Manual config

XGA Mode

ARC

Zoom +/- Variable by each mode

Position

Cinema

Reset

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TROUBLESHOOTING

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Change the Tuner

Correct the circuit

Power Error

Is the Set ON?

Is the input

cable attached?

What is

the input signal

mode?

Check Vout

Signal at pin 9.

Of Tuner

Check 33V

And 5V at pin

7,6 resp. of

Tuner

Check Vout

Signal at C230

Check Sub_V

At R302

Check Main_V

At R309

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

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No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Replace Jack board

AV1

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check CVBS

Signal at R103

of jack board

Check 3.3V

At L110 on jack

board

Check Sub_V

At R302

Check Main_V

At R309

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

Is the

Set ON?

Is the input

cable attached?

What is

the input signal

mode?

YES

PASS

FAIL

PASSPASS

PASS

FAIL

FAIL FAIL

PASS

FAIL

PASS

Page 16

Only for training and service purposes

- 16 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Replace Jack board

AV2

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check CVBS

Signal at R105

of jack board

Check 3.3V

At L110 on jack

board

Check Sub_V

At R302

Check Main_V

At R309

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

Is the

Set ON?

Is the input cable

attached?

What is

the input signal

mode?

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

Page 17

Only for training and service purposes

- 17 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Replace Jack board

AV3

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Is the

Set ON?

Is the input cable

attached?

What is

the input signal

mode?

Check CVBS

Signal at R144

of jack board

Check 3.3V

At L110 on jack

board

Check Sub_V

At R302

Check Main_V

At R309

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

YES

NO YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

Page 18

Only for training and service purposes

- 18 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Replace Jack Board

S-Video

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check Y/C

Signal at L131,132 on

Jack board

Check 3.3V

At L110 on jack

board

Check Sub_YC

At R302,303

Check Main_YC

At R309,320

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

Is the input cable

attached?

Is the

Set ON?

What is

the input signal

mode?

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

Page 19

Only for training and service purposes

- 19 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace CXA2069

Correct the circuit

Attach the input

cable(s)

Replace Jack Board

AV4

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check CVBS

Signal at R169

on jack board

Check 3.3V

At L110 on jack

board

Check Sub_V

At R302

Check Main_V

At R309

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check Q303

Circuit and 9V

at L300

What is

the input signal

mode?

Is the input cable

attached?

Is the

Set ON?

YES NO

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

Page 20

Only for training and service purposes

- 20 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace IC505

Replace STi5100

Power Error

Attach the input

cable(s)

Replace Tuner

DTV

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check 8bit

Signal at digital

Tuner at

R318-326.

Check 5V

At L305,310

Check 8bit

Signal at AR110-

AR111

Check 8bit

Signal at AR 500-

AR501

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check power

Levels for

STi5100

Is the

Set ON

Is the input

cable attached?

What is

the input signal

mode?

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

Page 21

Only for training and service purposes

- 21 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace IC301

Power Error

Attach the input

cable(s)

Replace Jack Board

Component

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check Y,Pb,Pr

At L129,128,130

respectively

Check 3.3V

At L110 on jack

board

Check Sync_DE

Signal at R370

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check 5V

At L303 on jack

board

Is the

Set ON?

Is the input cable

attached?

What is

the input signal

mode?

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

Page 22

Only for training and service purposes

- 22 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace Jack Board

Attach the input

cable(s)

RGB

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Is the

Set ON?

Is the input

cable attached?

What is

the input signal

mode?

Check LVDS

Output of Cortez

Check 24bit

RGB at AR700-

AR705

Check RGB

HV signal at R513

512,509,510,515

On Jack board

Check 3.3V

At L500 on jack

board

Check Power

Levels and crystal

YES

PASS

FAIL

FAILPASSPASS

PASS

FAIL

PASS

Page 23

Only for training and service purposes

- 23 -

No image

Push the POWER

ON key

Check for S/W error

Replace Cortez

Replace Hudson

Power Error

Replace SiI9011

Attach the input

cable(s)

Check outside

connections

HDMI

Power Error

Check the

Condition of all

Connectors, wafers,

I2C In the

system.

Check TMDS

Signal at AR1206-7

on main board

Check 5V

At R1232 on

Main board

Check 24 bit

RGB signal at

AR1200-1205

Check 24bit

RGB at AR700-

AR705

Check LVDS

Output of Cortez

Check Power

Levels and crystal

Check 1.8V

At L1206 and 3.3V at

L1207 And

crystal

Is the

Set ON?

Is the input cable

attached?

What is

the input signal

mode?

YES

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

FAIL

PASS

PASS PASS

Page 24

Only for training and service purposes

- 24 -

No Audio

Push the POWER

ON key

Replace the MSP

Power error or

replace CXA2069

Power Error

Check the interfacing circuit

AV1,2,3 and AV4/S-Video

Check

the Condition

of all Connectors,

wafers, I2C In

corresponding

Signal

flow?

Check the

supply voltage 8V

across L403

Check the

AV L/R output

At R377,376

Check

audio output at MSP

across R429-431.

Is the

Set ON?

YES

Turn OFF the Mute

Is the

Mute ON?

Check the

PWM output of NSP

across R436-439

Check

3.3V supply across

L402 and 1.8V at

C448

Check the

Amplifier output level

At L423-426

Check 18V

supply at L421

Increase the Volume

Volume level Of

the set 0?

Check the

AV1,AV2 ,AV3,

AV4/S-Video L/R signal

across R136-138, R135-137,

R157-158, R174-175 respectively

according to the

corresponding mode

On jack board

Correct them

Replace NSP

Power Error

Replace

TAS5122(amp)

There may be some

error in Audio

source.

TROUBLESHOOTING AV1, 2, 3, 4/S-Video

Page 25

Only for training and service purposes

- 25 -

No Audio

Push the POWER

ON key

Replace the MSP

Power error or

replace

IC605(TC74LCX157)

Power Error

Check the interfacing circuit

HDMI or replace STi5100

Check

the Condition

of all Connectors,

wafers, I2C In

corresponding

Signal flow?

Check the

supply voltage 8V

across L403

Check the

MUX I2S output

At R491,493,494 On

jack board

Check audio

output at MSP across

R429-431.

Check the

PWM output of

NSP across

R436-439

Check the

Amplifier output level

At L423-426

Check 18V

supply at L421

Check

3.3V supply across

L402 and 1.8V at

C448

Is the

Set ON?

Check the DTV

HDMI I2S signal at R183,

184,186 and R1218-1220

respectively according to The

corresponding mode On

main board

YES

Turn OFF the Mute

Is the

Mute ON?

Increase the Volume

Volume level Of

the set?

Correct them

Replace NSP

Power Error

Replace

TAS5122(amp)

There may be some

error in Audio

source.

TROUBLESHOOTING DTV/HDMI-Audio

Page 26

Only for training and service purposes

- 26 -

No Audio

Push the POWER

ON key

Replace the MSP

Power Error

Check the interfacing circuit

of Analog Tuner, component

and PC audio accordingly

w.r.t the mode.

Check the

Condition of all

Connectors, wafers,

I2C In corresponding

Signal flow?

Check the

supply voltage 8V

across L403

Check audio

output at MSP across

R429-431.

Check

the PWM output

of NSP across

R436-439

Check

3.3V supply across

L402 and 1.8V at

C448

Check 18V

supply at L421

Check the

Amplifier output level

at L423-426

Is the

Set ON?

Check

the RF SIF,

Component L/R and

PC L/R signal across R212,

R171-170, R505-506,

respectively according to

the corresponding

mode on jac

board

YES

Turn OFF the Mute

Is the

Mute ON?

Increase the Volume

Is Volume level

of the set 0?

Correct them

Replace NSP.

Power Error

Replace

TAS5122(amp)

There may be some

error in Audio

source.

TROUBLESHOOTING RF/Component/PC

Page 27

BLOCK DIAGRAM(Main)

- 27 -

Only for training and service purposes

TDFB-G236P

DVB/PAL

8bit(656),27M Hz,I2S

STi5100

CI SLOT

TS IN

CI TS

74LCX244

Tuner TS

MUX

3 State Buffer

3state-cont rol

SPDIF out

8bit(656),27M Hz,I2S

DTV out VLR

FFC WaferFFC Wafer FFC Wafer

Cortez Hudson

Sub V/YC

Main V/YC

8Pin Record

PC_RGB

Comp YPbPr

Scart RGB

Sil9012

TMDS Rx

(HDCP)

HDMI

8bit

SPDIF OUT

24bit

SPDIF out DTV

SPDIF out MSP

24bit

DTV out VLR

LVDS_31P

LCD : 10bit, AI, PWM,

INV_BRI

24bit

Uart commu nic ation

24bit

PDP modul e D/L

SDA,SCL

Wafer to PDP modul e

PDF Fan

Fan Contro l

Page 28

Only for training and service purposes

- 28 -

BLOCK DIAGRAM(Jack)

CXA2069Q

AUDIO/VI DEO SW

MSP4410K

Sound processor

NSP-2110A

Digital s ound processor

VLR

TV_out V

SCART RGB

VLR, YC

DTV V_out

MNT_VLR

PC_RGB

YPbPr

Component Jack

Audio_LR

WIRE_IR_in

WIRE_IR_out

Audi o out

CVBS

Audio

TV_out L R

I2S

Digital AMP

I2S DTV/HDMI

Main V/YC

AV_LR

AV1

DTV out

AV2

RGB

audio

RGB in

out

AV3

Side AV

VLR

VLR, YC

Sub V/YC

EPF LR

Audio_LR

TV_LR

MSP_SPDIF

8Pin Record

FFC WaferFFC Wafer FFC Wafer

Page 29

- 29 -

Only for training and service purposes

EXPLODED VIEW

010

020

080

120

140

090

150

030

070

170

110

050

060

100

040

130

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

Page 30

Page 31

Page 32

Page 33

Page 34

Page 35

Jun., 2006

Printed in KoreaP/NO : MFL36666002

LG 42LC2D Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual