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LC-42BX5H/M/X

SERVICE MANUAL

No. SY6X2LC42BX5M

LCD COLOR TELEVISION

LC-42BX5H LC-42BX5M

MODELS

In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.

LC-42BX5X

CONTENTS

SAFETY PRECAUTION

IMPORTANT SERVICE SAFETY PRE-

CAUTION .......................................................... i

Precautions for using lead-free solder.............. ii

CHAPTER 1. SPECIFICATIONS

[1] SPECIFICATIONS.........................................1-1

CHAPTER 2. OPERATION MANUAL

[1] OPERATION MANUAL.................................. 2-1

CHAPTER 3. DIMENSIONS

[1] DIMENSIONS................................................ 3-1

CHAPTER 4. REMOVING OF MAJOR PARTS

[1] REMOVING OF MAJOR PARTS...................4-1

CHAPTER 5. ADJUSTMENT PROCEDURE

[1] ADJUSTMENT PROCEDURE ......................5-1

[2] PUBLIC MODE SETTING PROCEDURE........5-7

CHAPTER 6. TROUBLESHOOTING TABLE

[1] TROUBLESHOOTING TABLE......................6-1

CHAPTER 7. BLOCK DIAGRAM / OVERALL WIRING DIAGRAM

[1] BLOCK DIAGRAM..........................................7-1

[2] OVERALL WIRING DIAGRAM .......................7-3

CHAPTER 8. SCHEMATIC DIAGRAM

[1] DESCRIPTION OF SCHEMATIC DIA-

GRAM .............................................................8-1

[2] SCHEMATIC DIAGRAM .................................8-2

CHAPTER 9. PRINTED WIRING BOARD

[1] OPERATION UNIT PRINTED WIRING

BOARD ...........................................................9-1

[2] LED, R/C UNIT PRINTED WIRING

BOARD ...........................................................9-2

[3] MAIN UNIT PRINTED WIRING BOARD.........9-3

[4] SUB UNIT PRINTED WIRING BOARD........9-11

[5] VIDEO-IN3 UNIT PRINTED WIRING

BOARD .........................................................9-17

Parts Guide

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used for after sales service only. The contents are subject to change without notice.

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LC-42BX5H/M/X

LC-42BX5H

SAFETY PRECAUTION

Service Manual

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Before returning the receiver to the user, perform the following safety checks:

3. Inspect all lead dress to make certain that leads are not pinched, and check that hardware is not lodged between the chassis and other metal parts in the receiver.

4. Inspect all protective devices such as non-metallic control knobs, insulation materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

5. To be sure that no shock hazard exists, check for leakage current in the following manner.

• Plug the AC cord directly into a 110 ~ 240 volt AC outlet.

• Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to an earth ground.

• Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity or measure the AC voltage drop across the resistor.

• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. All checks must be repeated with the AC cord plug connection reversed. (If necessary, a non polarized adaptor plug must be used only for the purpose of completing these checks.) Any reading of 0.74 Vrms (this corresponds to 0.5 mA rms AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner.

DVM

AC SCALE

1.5k ohm 10W

0.15µF

TEST PROBE

TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

SAFETY NOTICE

Many electrical and mechanical parts in LCD color television have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features

are identified by " " and shaded areas in the Replacement Parts Lists and Schematic Diagrams. For continued protection, replacement parts must be identical to those used in the original circuit. The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire or other hazards.

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LC-42BX5H/M/X

Precautions for using lead-free solder

Employing lead-free solder

• “All PWBs” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

Example:

L Fa

Indicates lead-free solder of tin, silver and copper.

L F a/a

Using lead-free wire solder

• When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks.

As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40 °C, we recommend you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.

Soldering

• As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 °C which is higher than the conventional lead solder by 40 °C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.

Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as required.

If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it. When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

• Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Part No. Description Code

ZHNDAi123250E J φ0.3mm 250g (1roll) BL ZHNDAi126500E J φ0.6mm 500g (1roll) BK ZHNDAi12801KE J φ1.0mm 1kg (1roll) BM

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LC-42BX5H/M/X

LC-42BX5H

CHAPTER 1. SPECIFICATIONS

[1] SPECIFICATIONS

Service Manual

Model

Item

LCD panel

(106 cm) Advanced SuperView & BLACK TFT LCD

Number of dots 3,147,264 dots (1366

Video Colour System

TV Function

TV-Standard

Receiving

VHF/UHF

PAL/SECAM/NTSC 3.58/NTSC 4.43/PAL 60

PAL: B/G, D/K, I SECAM: B/G, D/K, K/K

44.25 – 863.25 MHz

Channel

CA TV

TV-Tuning System

STEREO/BILINGUAL

Brightness

S1 – S41ch (including Hyperband)

Auto Preset 99 ch

NICAM: B/G, I, D/K A2 stereo: B/G

450 cd/m

Viewing angles H:176 V:176

Audio amplifier 10W 2

Speakers

Terminals

Rear

ANTENNA IN

INPUT 1

6.5 cm 4pcs

UHF/VHF 75 DIN type

VIDEO in, AUDIO in, COMPONENT in (480I, 580I, 480P, 580P, 720P/60Hz, 1080I/50Hz, 1080I/60Hz)

LC-42BX5M LC-42BX5XLC-42BX5H

768 3dots)

NTSC: M

Side

Front

OSD language

Power Requirement

Power Consumption

Weight

INPUT 2

VIDEO in, AUDIO in, COMPONENT in (480I, 580I, 480P, 580P, 720P/60Hz, 1080I/50Hz, 1080I/60Hz)

INPUT 4

HDMI (HDMI input) (480P, 580P, 720P/60Hz, 1080I/50Hz, 1080I/60Hz), AUDIO in

INPUT 5

HDMI (HDMI input) (480P, 580P, 720P/60Hz, 1080I/50Hz, 1080I/60Hz)

PC INPUT 15 pin mini D-sub, AUDIO in ( 3.5mm jack)

MONITOR OUTPUT

RS-232C

INPUT 3

VIDEO out, AUDIO out

9 pin D-sub male connector

VIDEO in, AUDIO in, S-VIDEO in

Headphones 3.5mm jack (Audio output)

English/Chinese English/Chinese/Arabic

AC110–240V,50/60Hz

225 W (0.8 W Standby) (Method IEC60107)

without stand

with stand

31.5 kg

37.0 kg

HDMI (HDMI input) (480P, 580P, 720P/50Hz, 720P/60Hz, 1080I/50Hz, 1080I/60Hz), AUDIO in

HDMI (HDMI input) (480P, 580P, 720P/50Hz, 720P/60Hz, 1080I/50Hz, 1080I/60Hz)

Operating Temperature

0C–40C

• As a part of policy of continuous improvement, SHARPreserves the right to make design and specification changes for product improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be some deviations from these values in individual units.

1 – 1

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– M E M O –

LC-42BX5H/M/X

1 – 2

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LC-42BX5H/M/X

LC-42BX5H

LCD TV

Service ManualLC-42BX5H/M/XMarketE

CHAPTER 2. OPERATION MANUAL

[1] OPERATION MANUAL

AC INPUT terminal

INPUT 3 terminals

TV (Rear)

TV/VIDEO button

RS-232C terminal

POWER (On/Off) button

PC INPUT terminals

INPUT 5 (HDMI) terminals

INPUT 4 (HDMI) terminals

INPUT 1 terminals

INPUT 2 terminals

terminals

MONITOR OUTPUT

Antenna input terminal

Headphone jack

OPC indicator*

*OPC: Optical Picture Control

SLEEP timer indicator

Volume display when headphones are plugged in

TV (Front)

Part names

)/down ( ) buttons

Channel up (

POWER indicator

OPC sensor

Remote control sensor

not in use.

plugged in.

headphones.

Volume up ( )/down ( )buttons

Regarding the headphone jack

• Use headphones with a stereo mini plug ( 3.5 mm).

• Be sure to unplug headphones from the jack when they are

• The speakers do not output volume when headphones are

• Audio adjustments do not affect the audio of connected

• You can set the volume to different levels for each input

source.

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LC-42BX5H/M/X

Remote control unit (LC-42BX5M/X)

Part names

(Reveal hidden for

TELETEXT)

TELETEXT mode: Display hidden

characters.

(TELETEXT)

Select the TELETEXT mode. (all TV

image, all TEXT image, TV/TEXT

image)

(SUBTITLE for TELETEXT)

To turn the subtitles on and off.

POWER (STANDBY/ON)

To switch the power on and off.

(Top/Bottom/Full)

(Subpage)

TELETEXT mode: Set the area of

magnification.

Display the Teletext subpage directly.

0-9

(Hold)

again to release the hold mode.

TELETEXT mode: Stop updating

Teletext pages automatically. Press

Set the channel.

TELETEXT mode: Set the page.

TV/VIDEO (INPUT SOURCE)

Select an input source. (TV, INPUT 1,

INPUT 2, INPUT 3, INPUT 4, INPUT 5,

PC)

(Flashback)

Press to return to the previous image

in normal viewing mode.

OPC

To switch Optical Picture Control on

WIDE

Change the wide image mode.

and off.

FREEZE

Freeze a motion picture on the screen.

DISPLAY

Display the programme information.

CH /CH

MPX

AV M OD E

VOL /VOL

TV input mode: Select the channel.

TELETEXT mode: Select the page.

SLEEP

(Mute)

Set the Sleep timer.

SELECT

To select either screen to be active in

Dual screen mode.

P&P

Display the menu screen.

SURROUND

ENTER

Execute a command.

RETURN

MENU mode: Return to the previous

menu screen.

EXIT

Colour (Red/Green/Yellow/

Blue)

TELETEXT mode: Select a page.

/ / / (Cursor)

NOTE

Select a video setting: AV MODE

(STANDARD, MOVIE, GAME, USER,

DYNAMIC), PC MODE (STANDARD,

USER)

Select the sound multiplex mode.

Set the volume.

Mute the sound.

Set the dual picture mode. PressP&P

again to return to normal view.

Select Surround settings.

Select a desired item on the setting

screen.

Return to the default screen.

• When using the remote control unit, point it at the TV.

Remote control unit (LC-42BX5H)

Part names

0-9

Set the channel.

POWER (STANDBY/ON)

To switch the power on and off.

TV/VIDEO (INPUT SOURCE)

Select an input source. (TV, INPUT 1,

INPUT 2, INPUT 3, INPUT 4, INPUT 5,

PC)

(Flashback)

Press to return to the previous image

in normal viewing mode.

DISPLAY

Display the programme information.

MPX

Select the sound multiplex mode.

CH /CH

VOL /VOL

TV input mode: Select the channel.

Set the volume.

SLEEP

Set the Sleep timer.

(Mute)

Mute the sound.

Display the menu screen.

SURROUND

Select Surround settings.

2 – 2

ENTER

Execute a command.

/ / / (Cursor)

Select a desired item on the setting

screen.

RETURN

MENU mode: Return to the previous

menu screen.

EXIT

Return to the default screen.

SELECT

To select either screen to be active in

Dual screen mode.

WIDE

Change the wide image mode.

P&P

Set the dual picture mode. PressP&P

againtoreturntonormalview.

FREEZE

Freeze a motion picture on the screen.

NOTE

• When using the remote control unit, point it at the TV.

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LC-42BX5H/M/X

LC-42BX5H

CHAPTER 3. DIMENSIONS

[1] DIMENSIONS

671

930.3

Service Manual

Unit: mm

9315011301

772

200

711

100

523

460

306

200

3 – 1

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LC-42BX5H

CHAPTER 4. REMOVING OF MAJOR PARTS

Service Manual

[1] REMOVING OF MAJOR PARTS

1. Detach the Terminal Cover [1].

2. Detach the 2 BUS Covers [2].

3. Remove the 2 screws [3] and detach the Hinge Cover.

4. Remove the 4 screws [4] and detach the Stand.

5. Remove the 1 screw [5], 2 screws [6], 6 screws [7] and the 15 screws [8]. Detach the Rear Cabinet.

LC-42BX5H/M/X

Terminal Cover

Bus Cover

Hinge Cover

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LC-42BX5H/M/X

6. Remove the 2 screws [9] and detach the Earth Strap (LC-42BX5X).

7. Remove the 2 screws [10]. Detach the Angle.

8. Remove the 1 screw [11] and the 2 screws [12] . Detach the Stand Base Cover.

9. Remove the 4screws [13]. Detach the SUS Angle-L and SUS Angle-R.

10.Remove the 3 screws [14] . Detach the Shield (LC-42BX5X).

Earth Strap

13 13

SUS Angle-R SUS Angle-L

Shield (SUB-PWB) LC-42BX5X

Angle

4 – 2

Stand Base Cover

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11.Remove the 2 screws [15] and detach the Top Control Cover Ass'y. Remove the 2 screws [16] and detach the OPERATION PWB Unit from Top Control Cover Ass'y.

Top Control Cover Ass'y

OPERATION PWB Unit

LC-42BX5H/M/X

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LC-42BX5H/M/X

12.Remove the 7 screws [17] and detach Chassis Tray.

13.Remove the 2 screws [18], the 2 screws [19] and the 1 screw [20]. Detach the AV Terminal Cover.

14.Remove the 8 screws [22] and detach the POWER PWB Unit from Chassis Tray.

15.Remove the 1screw [23] and detach the Support Angle.

16.Remove the 7 screws [21] and detach the SUB PWB Unit from Chassis Tray.

17.Remove the 3 screws [24] and detach the PWB Bracket B from SUB PWB Unit.

18.Remove the 3 screws [25] and detach the MAIN PWB Unit from PWB Bracket B.

19.Remove the 1 screw [26] and detach the SUB PWB Fix Angle from Chassis Tray.

20.Remove the Speaker Box L and Speaker Box R [27].

21.Remove the 2 screws [28] and detach the LED, R/C PWB Unit.

22.Remove the 1 screw [29] and detach the VIDEO-IN3 PWB Unit. Remove the 2 screws [30] and detach the MINI-AV Cover.

AV Terminal Cover

SUB PWB Unit

MAIN PWB Unit

PWB Bracket B

SUB PWB Fix Angle

Chassis Tray

POWER PWB Unit

Support Angle

VIDEO-IN3 PWB Unit

MINI-AV Cover

LED, R/C Cover

LED, R/C PWB Unit

Speaker Box R Speaker Box L

4 – 4

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23.Remove the 4 screws [31] and detach the Chassis Angles.

24.Remove the 8 screws [32] and the 8 screws [33]. Detach the Chassis Angle Top C and Chassis Angle Bottom C.

LC-42BX5H/M/X

Chassis Angle Top C

Side AngleSide Angle

Chassis Angle Bottom C

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LC-42BX5H/M/X

LC-42BX5H

CHAPTER 5. ADJUSTMENT PROCEDURE

Service Manual

[1] ADJUSTMENT PROCEDURE

The adjustment values are set to their optimum at the factory before shipping. If by any chance a value should become improper or a readjustment is required due to part replacement, make an adjustment according to the following procedure.

Before adjustment, perform aging for approx. 60 minutes to stabilize the unit.

1. Entering the adjustment process mode

There are 3 ways as follows:

• After power-on, press "ADJUSTMENT PROCESS" key of the remote control.

• With the KEY 4 (pin (81) of microprocessor) set to "L", turn the power ON.

• During servicing

While holding down the TV/VIDEO and Volume DOWN keys at the same time, set the Power switch to ON. (“K” standing for inspection process

mode is displayed in the upper left portion of the screen.) → Press the Channel DOWN and Volume DOWN keys at the same time. (The adjustment process mode screen appears.)

To cancel it, turn off the power using the Power switch or remote control.

2. Key operation in the adjustment process mode

1. Basic operations

• Tune in to a station using the Channel UP/DOWN keys.

• Switch the input using the TV/VIDEO key.

• Select an item to adjust using the Cursor / keys. (Pressing the Cursor key while at the bottom item moves to the top item on the

next page, and pressing the Cursor key while at the top item moves to the bottom item on the previous page.)

• Adjust the item selected using the Volume +/– or Cursor / keys.

• Press the Menu key to move to the next item. (Pressing the Menu key while at the bottom item moves to the top item on the next page.)

• Press the Manual Memory key to return to the top item. (Pressing the Manual Memory key while at the top item moves to the top item on the

previous page.) Press the Auto Preset key to move to the top item on the next page.

2. Layer movement

• Pressing the ENTER key while at an item other than I2C DATA and HOTEL POWERFIX on page 2 moves to the setting page of that item

name.

• Press the Flashback key to exit each setting page.

3. Adjustment procedure for RGTAR, GGTAR and BGTAR items on pages 3, 4, and 5 of the DVP layer

• At RGTAR, GGTAR, and BGTAR on pages 3, 4, and 5; pressing the Volume UP/DOWN or the Cursor / keys moves left or right. Select an item to adjust, and press the Direct Channel "12" key.

As the Cursor moves to the corresponding right field, make adjustments using the Volume UP/DOWN or the Cursor / keys. Pressing the Direct Channel "12" key at the right field moves back. Pressing the Cursor / keys, the Menu key, etc. moves to a different item.

3. Initialization

3-1 Connect the pins (81) and (82) of IC2001 (microprocessor), then turn on the power. 3-2 Check MODEL (A648MA). 3-3 Check INCH SIZE.

MODEL INCH SIZE

LC-42BX5H/M/X 42

(Screen of adjustment process menu page 1)

5 – 1

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LC-42BX5H/M/X

123

4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

M1ODE

INCH

ERROR

PUBL

HDCP

HDC

EXTTCONTROL

LA648HA

SIZE 42

NO RESE T

IC MODE OFF

40H 80

PRESETMODE OFF

OFF

5 – 2

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LC-42BX5H/M/X

4. Adjustment

4.1. AD converter level adjustment

1. 1080i input

Adjustment Conditions Adjustment Procedure

1) 1080i 75% colour bar signal input Used device name: LEADER LT448 Signal name: COLOUR BAR * Use the LT-446-compatible third one of three color bars. Setting value: 02: 1080i/59.94 (30 sF) H: 33.72 kHz, V: 29.97 Hz

2. 480i input

Adjustment Conditions Adjustment Procedure

1) 480i 75% colour bar signal input Used device name: LEADER LT448 Signal name: COLOUR BAR * Use the LT-446-compatible third one of three color bars. Setting value: 15: 480i/60 H: 15.73 kHz, V: 29.97 Hz

1) Set AUTO GAIN-OFFSET on page 3 (M2-HD) of the adjustment process DVP hierarchy to ON.

2) Set AUTO GAIN-OFFSET on page 3 (X-HD) of the adjustment process DVP hierarchy to ON. The top of the two layers is M2-SD, and the bottom is X-SD.

1) Set AUTO GAIN-OFFSET on page 4 (M2-SD) of the adjustment process DVP hierarchy to ON.

2) Set AUTO GAIN-OFFSET on page 4 (X-SD) of the adjustment process DVP hierarchy to ON. The top of the two layers is M2-SD, and the bottom is X-SD.

3. PC XGA input

Adjustment Conditions Adjustment Procedure

1) XGA 75% colour bar signal input (RGB) Used device name: LEADER LT448 Signal name: COLOUR BAR “SATURATION 75%” * Use one of two color bars where SATURATION can be changed. Setting value: 28: XGA H: 48.36 kHz, V: 60.00 Hz Be sure to set the SYNC setting to OFF.

* If all the items are set to ON, “RUN” is displayed during adjustment.

1) Set AUTO GAIN-OFFSET on page 5 (M2-PC) of the adjustment process DVP hierarchy to ON.

5 – 3

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LC-42BX5H/M/X

4.2. TAMP adjustment

Adjustment Conditions Adjustment Procedure

1) Receive the PAL standard colour bar signal. 1) If the maximum value of “YDATA1, YDATA2” on page 1 of adjustment process DVP hierarchy is not in the range of values in the list below, adjust “PAL TAMP1, PAL TAMP2” on the same page so that the maximum value of “Y” is in the range of values in the list below. * Note that the setting value may vary by model.

2) When pressing the TAMP1 and TAMP2 direct keys, adjustment of “PAL TAMP1, PAL TAMP2” is complete. Then, The values of “NTSC TAMP1, NTSC TAMP2” and “SECAM TAMP1, SECAM TAMP2” are automatically set. (NTSC: Value of PAL –7, SECAM: The same value as PAL)

MODEL 42BX5

Setting value 101 ~ 105

Reference (Screen of page 1 of adjustment process menu DVP hierarchy)

DVP

1 2 3 4 5 6 7 8 9 10111213 141516171819202122 23242526

TAM 1L 10 1

YDA AT

TAM 1HP

TAM 2LP

TAM 2HP

NTS TAMP1C

NTS TAMP2C

PAL TAMP 1

PAL TAMP 2

SE M TAMP 2

2YDA AT

CAM TAMP 1

103

105

101

103

105

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LC-42BX5H/M/X

4.3. White balance adjustment

1. White balance adjustment procedure

Adjust the white 144 gradation using RGB CUTOFF2 and then the white 73 gradation with RGB-GAIN.

1) Test signal adjustment

[Input signal] Display the WB test signals with built-in DVP of white 56% (144 gradations) and 29% (73 gradations) on the left and right of

[Adjustment value] Page 2 of adjustment process menu DVP hierarchy: RGB CUTOFF2, RGB-GAIN

the screen respectively by using the remote control code “011110010001010”.

Adjustment spec Inspection spec

White 56% x = 0.261 ±0.004 ±0.01 Radius from the center point

y = 0.277 ±0.004 ±0.01 Radius from the center point

White 29% x = 0.261 ±0.002 ±0.01 Radius from the center point

y = 0.277 ±0.002 ±0.01 Radius from the center point

[Adjustment method by bus] Cutoff RGB CUTOFF2 G CUTOFF2 = Fixed to 0.

Vary RB CUTOFF2.

Gain RGB-GAIN G-GAIN = Fixed to 0.

Vary RB-GAIN. (The adjustment value is measured with MINOLTA CA-210 and the correction mode is measured in the mode compatible with CH02 “TOPCON”.)

Adjustment range: ±30

5. MCL setting procedure

1. “MCL” is displayed in the upper left portion of the screen as shown in the figure below by sending the MCL key of the remote control for adjustment.

MCL

2. When the screen disappears after a few seconds and appears again, MCL setting is complete.

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LC-42BX5H/M/X

6. Factory setting

6.1. Performing the factory setting using the remote control for adjustment

1. Perform the factory setting using the remote control for adjustment. (This setting must be done after performing the MCL data setting.)

2. “H” standing for factory setting 1, “M” standing for factory setting 2, “A” standing for factory setting 3 or "X" standing for factory setting 4 is displayed in the upper left portion of the screen by continuing to press the Factory Setting key on the remote control for adjustment. (The figure below is the screen for factory setting 2.)

3. When “SETTING COMPLETE” is displayed in the middle of the screen after a few seconds, setting is complete.

SETTING COMPLETE

Model name Key name Remote control code Setting S-SYSTEM Set OSD language

LC-42BX5H Factory setting 1 (H) 100000111111110 I ENGLISH LC-42BX5M Factory setting 2 (M) 100000001010110 B/G ENGLISH LC-42BX5A Factory setting 3 (A) 100001101011110 D/K CHINESE LC-42BX5X Factory setting 4 (X) 100001001001110 B/G ENGLISH

4. Turn off the power.

NOTE: Set the Power switch to “OFF” immediately after completing the factory setting.

After the Factory setting 4 (X version) is implemented, confirm that the frequencies of only the following 5 channels are adjusted to Australian channels.

TV-CH Fv(MHz)

2 64.25 7 182.25

9 196.25 10 209.25 28 527.25

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LC-42BX5H/M/X

[2] PUBLIC MODE SETTING PROCEDURE

1. How to start Public Mode

• There are the following two ways to get the public mode setup screen displayed.

1) Press the “INPUT” and “VOL (+)” keys on the set at once and turn on the power.

2) Get the password input screen displayed.

Procedure

• The input starts with the leftmost digit.

• Use the numeric keys [1] thru [9] and [10/0] keys on the remote controller. The other keys are not acceptable.

• With a numeric-key input, “–” will change to “ “. The input position will move one digit to the right.

• With all the 3 digits entered, the password will be verified.

3) The 3-digit password is now verified. The password [0] [2] [7] provides for the public mode screen. (This screen comes on with whatever adjustment process settings.) With any other passwords, the screen changes to the normal mode.

In the adjustment process mode, turn on “PUBLIC MODE”. Also press the “CH ( )” and “VOL (+)” keys on the set at once and turn on the power.

2. How to exit Public Mode

There are the following ways to quit the public mode setup screen.

• Turn off “PUBLIC MODE” in the adjustment process mode. ( ) ← This way alone is not for quitting the setup screen, but for quitting the mode itself.

• Turn off the power with the “POWER” key. ( )

• Select “ENTER”. ( )

• Move the cursor to “RESET” and press the “FLASHBACK” key. (Back to the normal mode screen) ( )

••• “PUBLIC MODE” stays on in the adjustment process mode.

••• The settings will be back to the factory ones.

3. Public Mode Setting Values

• With the factory settings made, the public mode settings get initialized. (The adjustment process remains intact.)

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LC-42BX5H/M/X

4. Public Mode Menu

The guidance is not displayed onscreen. Setup procedure

• To move the cursor up and down, use the “cursor UP/DOWN” key (remote controller) and “CH ( )/( )” key (remote controller and set).

• To change the settings, use the “cursor RIGHT/LEFT” key (remote controller) and “VOL (+)/(–)” key (remote controller and set).

• To save new settings, keep the cursor at “Enter” and use the “cursor RIGHT/LEFT” key (remote controller) and “VOL (+)/(–)” key (remote controller and set).

Public mode Power on fixed Maximum volume Volume fixed Volume fixed level RC button Panel button Menu button On screen display Input mode start Input mode fixed 232C Powon RC path through Reset Enter

5. On Setting Items

1. POWER ON FIXED

[Variable ] [ 60] [Variable ] [ 20] [Respond ] [Respond ] [Respond ] [Yes ] [Normal ] [Variable ] [Disable ] [Off ]

Selection Variable/Fixed Default Variable Explanation When set to “Fixed”, the power cannot be turned off with the power key on the remote control or main unit, and the image

reception state is kept (it does not enter the standby state). The power can be turned off by shutting off power supply from AC.

Limit in setting • Power key on the main unit/remote control power supply key

• OFF timer/ON timer Exception None Remarks • Selection of “FIXED” assumes use of STB, etc.

• When set to “Variable”, if the main power switch is set to off, the power is turned off after a wait of 1 second.

(Push-push switch only)

• Display ON/OFF in the hotel menu is controlled by the adjustment process “HOTEL POWERFIX”.

• When the power button is operated, a caution is displayed (it times out in 5 seconds).

(For the caution, refer to the power on fixed message sheet.)

* The caution is not displayed when in the adjustment process, hotel menu, default setting, MCL operation and auto preset

(Ch search operation). The OSD display including the menu and this caution have priority over all others. When “OSD display” (described below) is set to “Variable”, this caution is displayed as a special case.

2. MAXIMUM VOLUME

Selection Adjustment from 1 to 60 (no loop) Default 60 Explanation Sound volume can not be adjusted higher than the preset value. Limit in setting • When the sound volume is set lower than 59, only figures are displayed and the sound volume bar is not displayed.

• The maximum sound volume for ON-timer (Wake up timer) is limited also to the preset value. Exception • In the item “VOLUME” of adjustment process, the sound volume can be set freely irrespective of this setting. Remarks • Setting is valid only for the speakers of the unit. (As for the headphone, the sound volume can be set up to 60 irrespective

of the limit.)

• In line output (sound volume variable), the sound volume can be adjusted from -60 to 0 irrespective of pre-adjusted value.

• When the sound volume is set higher than the MAX setting by the adjusting process or headphone, the sound volume con-

trol operation is prohibited for turn-up and the sound volume should be turned down to MAX in this state.

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LC-42BX5H/M/X

3. VOLUME FIXED

Selection Selection between “Variable” and “Fixed” (loop provided) Default Variable Explanation Sound volume is fixed and made invariable. Limit in setting • The sound volume for the ON-timer (Wake up timer) is fixed also without display of menu. Besides, the setting is made

Exception • In the item “VOLUME” of adjustment process, the sound volume can be set freely irrespective of this setting. Remarks • In “Variable” setting, the sound volume had been conventionally set at 1 but this operation has been abolished (and follows

4. VOLUME FIXED LEVEL

Selection Adjustment from 1 to 60 (no loop) Default 20 Explanation The sound volume to be fixed by “Volume fixed” is determined. Limit in setting None Exception None Remarks Setting is valid only when “Volume fixed” is selected for “fixed”.

impossible. (Basically, the menu is not displayed.)

• The following keys become invalid:

1) Sound volume Up/Down (VOL +/-) [for both remote control and the unit]

2) Mute (MUTE)

the last memory).

• The sound volume for the ON-time is not set at 1 either and the sound volume set value of the ON-timer before executing

the hotel mode is held.

• Setting is valid only for the speakers of the unit. (As for the headphone, the sound volume can be set up to 60 irrespective

of the limit.)

• In line output (sound volume variable), the sound volume can be adjusted from -60 to 0 irrespective of pre-adjusted value.

• As for sound volume fixing and sound volume MAX level, the sound volume fixing has priority.

• Once the sound volume has been changed by adjustment process or headphone, it should be set back to the sound volume

preset by sound volume fixing level when the adjustment process ends or when the headphone is removed.

This must be confirmed actually by changing also the sound volume in accordance with setting.

5. R/C BUTTON

Selection Selection between “Respond”, “Limited” and “No respond” (loop provide) Default Respond Explanation Keys acceptable by remote control are limited or reception of keys can be prohibited. Limit in setting 1) In “limited” setting, only power ON/OFF, sound volume , tuning and BACKLIGHT (brightness sensor) are

accepted.

2) In “No respond” setting, all the keys (including the power key) are not accepted. Exception • Adjustment process, factory setting, inspection process and hotel only keys are valid irrespective of setting.

Remarks

6. PANEL BUTTON

Selection Selection between “Respond” and “No respond” (loop provide) Default Respond Explanation All the operations by keys (except the power key) of the unit can be invalidated. Limit in setting Exception • Inspection mode and hotel menu mode can be started irrespective of setting.

Remarks

7. MENU BUTTON

Selection Selection between “Respond” and “No respond” (loop provide) Default Respond Explanation In “No respond” setting, the menu operation by the menu key of the remote control and the menu key of the unit are invali-

Limit in setting • ON-timer (Wakeup Timer) is turned OFF.

Exception • Inspection mode and hotel menu mode can be started irrespective of setting.

Remarks

• All the keys can be used in adjustment process, inspection mode and hotel menu irrespective of setting.

dated.

• The following keys become invalid.

Wake-up timer and clock setting keys and all of the direct change keys to menu display

• All the keys can be used in adjustment process, inspection mode and hotel menu irrespective of setting.

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LC-42BX5H/M/X

8. ON SCREEN DISPLAY

Selection Selection between “Yes”, “Limited” (loop provide) Default Yes Explanation The following OSD displays are made ineffective.

Displays of menu group, channel call, sound volume bar and direct key call

Limit in setting • Set time of the OFF-timer (SLEEP TIMER) is cleared.

• Setting of the no-signal power-OFF (AUTO POWER OFF) is cleared to “OFF”.

• Setting of the no-operation power-OFF is cleared to “OFF”.

• Keys falling under any of the following items become invalid.

1) Appearance of screen changes and the sound changes.

2) Personal functions which are hard to restore. Ex.) Screen display, menu, OFF-timer, ON-timer, AV MODE, screen size switching, clock setting, treble emphasis, AUDIO

ONLY, sound changeover, LANGUAGE, CLOSED CAPTION

Others • Simple input switching is generated. Those which are restored soon after leaving as they are and may be requested for

change by customer are not prohibited. Ex.) Brightness sensor (BACKLIGHT) and PIC. FLIP

Exception • Such a caution which is displayed independently is displayed as it is.

9. INPUT MODE START

Selection Selection between “Normal”, “TV (CH~)” “INPUT1~5”, “PC” (loop provide) Default Normal Explanation In power-ON, the input source to be started or channel can be set.

About options • All the input sources in the model are made selectable.

Limit in setting • The display of channel setting menu and the channel setting operation are prohibited (except for MCL). Exception None Remarks • In setting at “Normal”, the setting of “Input mode fixed” is changed to “Variable” and selection should be prohibited.

10.INPUT MODE FIXED

Selection Selection between “Variable” and “Fixed” (loop provide) Default – (Variable) Explanation The input mode is fixed at the input source or the channel set at the “Input mode start” in 9 and other input sources and chan-

Limit in setting • With the execution of hotel mode, the input source is forced to change to that set by “Input mode start” and the channel

Exception None Remarks • In the following case, setting is cancelled and mode is changed to “Variable”.

11.232C POWON

Non-responding signal caution, TELETEXT caution and power-ON fixing caution

(In standard mode, the operation follows the last memory.)

• When the input/output switchable input source is selected and the input source is set to output, the setting of input/output

switching is changed to input at the execution of hotel menu. In addition, the input/output switching by menu is prohibited.

• In TV mode, the display of all channels is stopped and it is treated as an input source. At this time, the channel to be set fol-

lows the last memory and the content of the last memory is included in the notation by options. Ex.) TV (CH2), TV (CH4) etc.

• The order of appearance of options in the hotel menu should agree with the order of toggles by input switching key.

nels can be made non-selectable.

switching and input switching are prohibited thereafter.

• The following keys are invalidated.

CH , direct tuning button, FLASHBACK, input *However, the keys (input switching and CH keys) of the unit for menu operation remain valid.

When the setting of “Input mode start” is set to “Standard (Normal)”

Selection “Enable” and “Disable” Default Disable Explanation When in the standby state, power ON by the RS-232C command is enabled or disabled. Limit in setting None Exception None Remarks It is irrelevant to power OFF by the RS-232C command.

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LC-42BX5H/M/X

12.RC PATH THROUGH

Selection “Off”, “On: TV RCE”, “On: TV RCD” Default Off Explanation Remote control signal output from the pin 9 of the RS-232C terminal and signal reception by is enabled or disabled.

When set to “ON: TV RCE”, TV also receives signals. With “ON: TV RCD”, the remote control signal is output from the pin 9,

but TV does not respond to the remote control. Limit in setting When set to “ON: TV RCD”, TV does not accept the remote control. Exception None Remarks

RS-232C power ON command “POWR1_ _ _ ”

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– M E M O –

LC-42BX5H/M/X

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LC-42BX5H

CHAPTER 6. TROUBLESHOOTING TABLE

Service Manual

[1] TROUBLESHOOTING TABLE

No power (front LED failure to light up) or no startup (front LED failure to turn from red to green)

Is the AC cord connector tightly connected to the set? NO Reconnect the AC cord tightly and turn on the power again.

YES Is the output voltage at pin (5) of P5011 (BU+5V line) as specified?

YES Are the wire harnesses and other cables properly connected in

the set?

YES Is there the PS ON and PNL_POW signal input at pin (1) and (4) of P5011 (PS ON line)?

YES Is the output voltage of each pin on P5010 as prescribed? Pin 1 6V

Pins 3 and 4 5V Pins 7 and 8 10V Pins 11 and 12 13V

NO Replace the power unit (RDENCA195WJQZ).

NO Reconnect the wire harnesses and other cables properly in the

set.

NO Check the PS ON signal line PNL_POW signal line.

NO Replace the power unit (RDENCA195WJQZ).

YES Are the DC/DC converter outputs and the output voltages along the control lines as specified?

1) 5V (IC701, Q705 etc.)

2) 4V (IC703, Q707 etc.)

3) 3.3V (IC702, Q706 etc.)

4) 1.5V (IC704, Q708 etc.)

5) 8.5V (IC705 etc.)

6) 31V (IC706 etc.)

NO Check the DC/DC converters and the control lines. Replace

defective parts as required.

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LC-42BX5H/M/X

With <Video, S-video> signal input No video onscreen (1)

No external input video onscreen <INPUT 1>

Is INPUT 1 selected on the input select menu screen? NO Select INPUT 1 on the input select menu screen to pick up the

right input signal.

YES Is there the video signal input at pin (7) of IC3401 (AV SWITCH)? NO Check the line between pin (8) of J3404 and pin (7) of IC3401.

YES <Video signal> Is there the video signal output at pin (37) of IC3401?

<S-video signal> Are there the Y and C signal outputs at pins (39) and (41) of IC3401, respectively?

YES <Video signal> Is there the video signal input at U2 pin of IC801? NO <Video signal> Check Q3404 and its peripheral circuits. <S-video signal> Are there the Y and C signal inputs at P1 pin

and K1 pin of IC801, respectively?

NO Check IC3401 and its peripheral circuits.

<S-video signal> Check Q3407 and its peripheral circuits for the C signal, and Q3408 and its peripheral circuits for the Y signal.

YES Are signals output from the pins P22, P23, R22, R23, T22, T23, U22, U23, V22, and V23 of IC801 normally?

YES Check LVDS cable, LCD controller (incl. panel) and their periph-

eral circuits.

NO Check IC801 and its peripheral circuits.

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LC-42BX5H/M/X

With <Video, S-video> signal input No video onscreen (2)

No external input video onscreen <INPUT 2>

Is INPUT 2 selected on the input select menu screen? NO Select INPUT 2 on the input select menu screen to pick up the

right input signal.

YES Is there the video signal input at pin (7) of IC3401 (AV SWITCH)? NO Check the line between pin (8) of J3403 and pin (7) of IC3401.

YES <Video signal> Is there the video signal output at pin (37) of IC3401?

<S-video signal> Are there the Y and C signal outputs at pins (39) and (41) of IC3401, respectively?

YES <Video signal> Is there the video signal input at U2 pin of IC801? NO <Video signal> Check Q3404 and its peripheral circuits. <S-video signal> Are there the Y and C signal inputs at P1 pin

and K1 pin of IC801, respectively?

NO Check IC3401 and its peripheral circuits.

<S-video signal> Check Q3407 and its peripheral circuits for the C signal, and Q3408 and its peripheral circuits for the Y signal.

YES Are signals output from the pins P22, P23, R22, R23, T22, T23, U22, U23, V22, and V23 of IC801 normally?

YES Check LVDS cable, LCD controller (incl. panel) and their periph-

eral circuits.

NO Check IC801 and its peripheral circuits.

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LC-42BX5H/M/X

With <Video, S-video> signal input No video onscreen (3)

No external input video onscreen <INPUT 3>

Is INPUT 3 selected on the input select menu screen? NO Select INPUT 3 on the input select menu screen to pick up the

right input signal.

YES Are there the following signal inputs at the input terminals of

IC3401 (AV SWITCH)?

NO <Video signal>

Check the line between pin (6) of J143 and pin (1) of IC3401.

<Video signal> Is there the video signal input at pin (1)? <S-video signal> <S-video signal> Are there the Y and C signal inputs at pins (3) and (5), respec-

tively?

YES <Video signal> Is there the video signal output at pin (37) of IC3401? <S-video signal> Are there the Y and C signal outputs at pins (39) and (41) of IC3401, respectively?

YES <Video signal> Is there the video signal input at U2 pin of IC801? NO <Video signal> Check Q3404 and its peripheral circuits. <S-video signal> Are there the Y and C signal inputs at P1 pin

and K1 pin of IC801, respectively?

YES Are signals output from the pins P22, P23, R22, R23, T22, T23, U22, U23, V22, and V23 of IC801 normally?

YES Check LCD controller (incl. panel) and their peripheral circuits.

NO Check IC3401 and its peripheral circuits.

NO Check IC801 and its peripheral circuits.

Check the line between J141 and pins (3)/(5) of IC3401.

<S-video signal> Check Q3407 and its peripheral circuits for the C signal, and Q3408 and its peripheral circuits for the Y signal.

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LC-42BX5H/M/X

With <Component> signal input No video onscreen (4)

No external input video onscreen <INPUT 1>

Is INPUT 1 selected on the input select menu screen? NO Select INPUT 1 on the input select menu screen to pick up the

right input signal.

YES Are there the Y, Pb and Pr signal inputs at pins (25), (1) and (5)

of IC3402 (Component SW), respectively?

YES Is input waveform of IC802 normal? Y=U1pin, Sync=J2pin Pb=L1pin, Pr=R1pin

YES Are there the signal outputs at pins U22, U23, V22, V23, P22, P23, R22, R23, T22, T23 of IC801, respectively?

YES Check LVDS cable, LCD controller (IN PANEL) and their peripheral circuits.

NO Check the line between pins (10)/(6)/(4) of J3404 and pins (25)/

(1)/(5) of IC3402.

NO Check IC3402 and its peripheral circuits.

NO Check IC801 and its peripheral circuits.

With <Component> signal input No video onscreen (5)

No external input video onscreen <INPUT 2>

Is INPUT 2 selected on the input select menu screen? NO Select INPUT 2 on the input select menu screen to pick up the

YES Are there the Y, Pb and Pr signal inputs at pins (27), (3) and (7) of IC3402 (Component SW), respectively?

YES Is input waveform of IC802 normal? Y=U1pin, Sync=J2pin

Pb=L1pin, Pr=R1pin

YES Are there the signal outputs at pins U22, U23, V22, V23, P22, P23, R22, R23, T22, T23 of IC801, respectively?

YES Check LVDS cable, LCD controller (IN PANEL) and their periph-

eral circuits.

NO Check the line between pins (10)/(6)/(4) of J3404 and pins (27)/

NO Check IC3402 and its peripheral circuits.

NO Check IC801 and its peripheral circuits.

right input signal.

(3)/(7) of IC3402.

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LC-42BX5H/M/X

With <Component> signal input No video onscreen (6)

No external input video onscreen <INPUT 4>, <INPUT 5>

Is INPUT 4, INPUT 5 selected on the input select menu screen? NO Select INPUT 4 or INPUT 5 on the input select menu screen to

pick up the right input signal.

YES Are there the signal inputs from the HDMI (SC402, SC403)

connector to the following input terminals of IC8702 (pin (5), (6), (8), (9), (11), (12), (14), (15), (16), (17), (19), (20), (22), (23), (25), (26)).

YES Are there the clock, H, V, Data signal outputs at pins (70) - (76),

(83) - (90), (96), (98), (99), (104) - (111) of IC8702, respectively?

YES Are waveforms of the clock, H, V, and Data input and output

terminals of IC8401 normal?

NO With an HDMI device connected, is IC403, IC404 (EEPROM)

accessed by I2C and is the DDC I2C CLOCK/DATA data read?

Check IC403, IC404 and their peripheral circuits.

NO Check IC8702, IC8703 and their peripheral circuits.

NO Check IC8401 and its peripheral circuits.

YES Are there the signal outputs at pins U22, U23, V22, V23, P22, P23, R22, R23, T22, T23 of IC801, respectively?

YES Check LVDS cable, LCD controller (IN PANEL) and their peripheral circuits.

NO Check IC801 and its peripheral circuits.

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LC-42BX5H/M/X

No audio heard (1)

No sound in the UHF/VHF reception.

Is the IF output from the tuner pin (14) of TU3401 as specified? NO Check TU3401 and its peripheral circuits.

YES Is the SIF signal input at A21 pin of IC801 as specified? NO Check Q3414, Q3415 and their peripheral circuits.

YES Are audio signals from the pins B23 and D23 of IC801 as prescribed?

YES Is there the L-ch audio signal output at pins (56), (53) of IC1301? NO Check IC1301 and its peripheral circuits. Is there the R-ch audio signal output at pins (57), (54) of IC1301?

YES Is there the L-ch audio signal output at pins (20), (21) of IC1303 (AMP)? Is there the R-ch audio signal output at pins (40), (41) of IC1303 (AMP)?

NO Check IC801 and their peripheral circuits.

NO Check IC1303 and its peripheral circuits.

YES Are audio signals of L-ch and R-ch output from the pins (1)/(2) and (3)/(4) of P5007 normally?

YES Check the speakers and their peripheral circuits.

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Page 33

No audio heard (2)

No external audio heard <INPUT 1> Is there the L-ch audio signal input from pin (11) of input terminal

J3404 to pin (8) of IC3401? Is there the R-ch audio signal input from pin (13) of input terminal J3404 to pin (10) of IC3401? <INPUT 2> Is there the L-ch audio signal input from pin (11) of input terminal J3403 to pin (14) of IC3401? Is there the R-ch audio signal input from pin (13) of input terminal J3403 to pin (15) of IC3401?

<INPUT 3> Is there the L-ch audio signal input from pin (5) of input terminal J143 to pin (2) of IC3401?

Is there the R-ch audio signal input from pin (4) of input terminal J143 to pin (4) of IC3401?

YES Is there the L-ch audio signal output at pins (56), (53) of IC1301? NO Check IC1301 and its peripheral circuits. Is there the R-ch audio signal output at pins (57), (54) of IC1301?

YES Is there the L-ch audio signal output at pins (20), (21) of IC1303

(AMP)? Is there the R-ch audio signal output at pins (40), (41) of IC1303

(AMP)?

NO Check IC1303 and its peripheral circuits.

LC-42BX5H/M/X

YES Are audio signals of L-ch and R-ch output from the pins (1)/(2) and (3)/(4) of P5007 normally?

YES Check the speakers and their peripheral circuits.

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LC-42BX5H/M/X

No audio heard (3)

No audio signal at the monitor audio output terminal.

Is there the L-ch audio signal output at pin (37) of IC1301? NO Check IC1301 and its peripheral circuits. Is there the R-ch audio signal output at pin (36) of IC1301?

YES Does the audio mute circuit function?

(Q3401, Q3402 and Q3403)

YES Check the monitor audio output terminal (J3403) and its peripheral circuits.

No audio heard (4)

No sound heard from the headphone.

Is there the audio signal output at pins (25) (L-ch) and (24) (R-ch) of IC1301?

NO Check Q3401, Q3402, Q3403, pin (58) of IC2001 and their

peripheral circuits.

Is there the L-ch audio signal output at pin (3) of IC1302 (H/P AMP)? Is there the R-ch audio signal output at pin (5) of IC1302 (H/P AMP)?

YES Check J101, IC1901, IC1902 and it peripheral circuits, as well as the headphone jack line.

NO Is the mute signal input at pin (2) of IC1302 as specified?

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LC-42BX5H/M/X

No audio heard (5)

No HDMI sound heard. (INPUT 4, INPUT 5 *INPUT 4 is digital audio.)

Does the HDMI image appear onscreen? NO Refer to “<INPUT 4, INPUT 5> in No external image onscreen

YES No audio output from INPUT 4 and INPUT 5. NO Check if the EDID data of IC403 (INPUT 5) or IC404 (INPUT 4) is

YES Are waveforms of the pins (120) - (124) of IC8702 output

normally?

YES Are output waveforms of the audio output pins B23 and D23 of IC801 normal?

NO Check peripheral circuits of IC8702.

NO Check peripheral circuits of IC801.

(HDMI)”.

normal.

YES

Check peripheral circuits of IC403 and IC404.

YES Are audio signals of L-ch and R-ch input in to the pins (53) and

(54) for volume, equalizer and sound of IC1301 normally and output from the pins (28) and (27) normally?

YES Are there the L-ch and R-ch audio signal outputs at pins (20), (21) and (40), (41) of IC1303 (AMP), respectively?

YES Are there the L-ch and R-ch audio signal inputs at pins (1), (2)

and (3), (4) of P5007, respectively?

NO Check peripheral circuits of IC1301.

NO Check IC1303 and its peripheral circuits.

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LC-42BX5H/M/X

No audio heard (6)

No sound from the HDMI sound input terminal. (INPUT 4 analog audio)

YES Is there the L-ch audio signal input from pin (4) of external input

terminal J3401 (HDMI AUDIO IN) to pin (44) of IC3401? Is there the R-ch audio signal input from pin (2) of external input

terminal J3401 (HDMI AUDIO IN) to pin (42) of IC3401?

YES Are there the L-ch and R-ch audio signal outputs at pins (36) and (35) of IC3401 (SW), respectively?

YES Are audio signals of L-ch and R-ch input in to the pins (56) and

(57) for volume, equalizer and sound of IC1301 normally and output from the pins (28) and (27) normally?

YES Are there the L-ch and R-ch audio signal outputs at pins (20), (21) and (40), (41) of IC1303 (AMP), respectively?

NO Check IC3401 and its peripheral circuits.

NO Check peripheral circuits of IC1301.

NO Check IC1303 and its peripheral circuits.

YES Are there the L-ch and R-ch audio signal inputs at pins (1), (2)

and (3), (4) of P5007, respectively?

No audio heard (7)

No PC audio output

YES Pin (2) of J3402: Is L-ch input into the pin (17) of IC3401? Pin (3) of J3402: Is R-ch input into the pin (18) of IC3401?

YES Are there the L-ch and R-ch audio signal outputs at pins (36) and

(35) of IC3401 (SW), respectively?

YES Are audio signals of L-ch and R-ch input in to the pins (56) and (57) for volume, equalizer and sound of IC1301 normally and

output from the pins (28) and (27) normally?

YES Are there the L-ch and R-ch audio signal outputs at pins (20), (21) and (40), (41) of IC1303 (AMP), respectively?

NO Check IC3401 and its peripheral circuits.

NO Check peripheral circuits of IC1301.

NO Check IC1303 and its peripheral circuits.

YES Are there the L-ch and R-ch audio signal inputs at pins (1), (2) and (3), (4) of P5007, respectively?

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No picture appears on the SUB side of the two-screen display.

No picture from Video or S-Video appears.

YES Are waveforms of pins 27 (Video), 19 (S_Y) and 11 (S_C) of IC8401 normal?

YES Are waveforms of output DE/HSO/VSO of IC8401 and each data (R/G/B0-9) normal?

No picture appears on the SUB side of the two-screen display.

No picture from Component appears.

YES Is input waveform of IC3404 normal? INPUT1: pin 27 (Y), pin 3 (Pb), pin 7 (Pr) INPUT2: pin 25 (Y), pin 1 (Pb), pin 5 (Pr)

LC-42BX5H/M/X

NO Check if the routes from pins 23 (Video), 27 (S_Y) and 25 (S_C)

of IC3401 to pins 27 (Video), 19 (S_Y) and 11 (S_C) of IC8401 are normal.

NO Check IC8401 and its peripheral circuits.

NO Check circuits to IC3401 input.

YES Are waveforms of pins 30 (Sync), 25 (Y), 17 (Pb) and 9 (Pr) of

IC8401 normal?

YES Are waveforms of output DE/HSO/VSO of IC8401 and each data (R/G/B0-9) normal?

NO Check peripheral circuits of IC3401 and if the routes from pins 17

(Y), 14 (Pb) and 11(Pr) of IC3401 to pins 30 (Sync), 25 (Y), 17 (Pb) and 9 (Pr) of IC8401 are normal.

NO Check IC8401 and its peripheral circuits.

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LC-42BX5H/M/X

LC-42BX5H

LCD TV

Service ManualLC-42BX5H/M/XMarketE

CHAPTER 7. BLOCK DIAGRAM / OVERALL WIRING DIAGRAM

[1] BLOCK DIAGRAM

LED

TO SUB

BU+5V,BU+3.3V,OPC+3.3V,R/C,POWG_LED,POWR_LED,LED_YOYAKU,LED_OPC,OPC,HP_L,HP_R,HP_PLUG,HP_GND

FRONT

INPUT3 VIDEO IN

INPUT3 SY/C IN

QPLGNA348WJZZY

P141

14pin

SUB

INPUT1 VIDEO IN

J3404

INPUT2 VIDEO IN

J3403

TUNER V OUT 1/2

TU3401

VT2W5CD551

INPUT1_CVBS

INPUT2_CVBS

INPUT3_CVBS OPC

INPUT3_Y,C S_SW

TUNER_CVBS VOUT2

SCL,SDA(5V)

AFT,AGC

TO SUB

STV_V

OPC

IC101

LED

D103/114/115

OPERATION

CONTROL SW

S171-S175

BU+3.3V,KEY1,KEY2,STBY_POW

V2_V

V3_V

V1_V

V1_Y V1_C

MTV_V

AV SW

VHIMM1492BF-1Y

5 input -2 output

6dB AMP

0100-

IR Reciever

RMC101

HP JACK

J101

0171-

POW SW

S177

RS-232C

SC3401

INPUT1/2/3 VIDEO,INPUT1/2 Y detect

CVBS IREM

VOUT1 REM

S_Y INV_POW,OFL_DAC

YOUT1

S_C SP_MUTE,HP_MUTE

COUT1

P101

QPLGNA335WJZZY

15pin

QPLGNA349WJZZY

P171

QPLGNA325WJZZY

5pin

QPLGNA339WJZZY

AC_CTRL,POW

Rx,Tx

HP_DET

AC_DETEC

IC2010

MONITOR V OUT

INPUT1

COMPONENT IN

J3404

INPUT3 AUDIO IN

J3406

INPUT2

COMPONENT IN

J3403

INPUT1 AUDIO IN

J3404

INPUT2 AUDIO IN

J3403

INPUT4 AUDIO IN

J3401

PC AUDIO IN

J3402

TUNER S-IF OUT

TU3401

MONITOR L/R OUT

INVERTER

LCD MODULE

CVBS(SC MIX) S

COMPONENT SW

L_MUTE

V2_L/R

V3_L/R

MTV_L/R

STV_L/R

V1_L/R

VHISM5301CS-1Y

COMPONENT SW VHISM5301CS-1Y

D_SEL F_SEL1/2

AV SW

VHIMM1492BF-1Y

SIF AMP

S_STBY,L_MUTE2

INPUT1_Y,Pb,Pr

INPUT2_Y,Pb,Pr

INPUT1 L/R L/R

INPUT2 L/R

INPUT4 L/R

PC L/R

INPUT3 L/R

S_IF

INVERTER

CONNECTER

TO MAIN

Y,Pb,Pr

HP amp

HP_L/R

Audio

L/R

Volume/EQ/HP

AMP/Surround

AUDIO AMP

SP_L/R

TO LED UNIT

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LC-42BX5H/M/X

MAIN

PC_H,PC_V

PC_R/G/B

P_PLUG,HP_GND

HPDCTL1/2 HPD1/2

,Tx

AC_DETECT

IC2010

RESET

OPC

IREM

REM

FL_DAC

_MUTE

_DET

RL,POW 3.3V

MCU

IC2001

SHORT_DET CVBS

IC2006

EEPROM

IC2009

TEMP SENSOR

IC2001

UART 1.5V

DVP_33CTRL

27MHzXtal

S_IF

OFL_PWM

DVP-M2

IC801

EEPROM

I2S

8bit

27MHzXtal

Y,Pb,PR

3.3V 3.3V

1.5V 2.5V

Shmitt triger

IC405

H,V

DVP-X IC8401

8bit SDA,SCL

PC IN

SC401

QSOCNA449WJZZ

EEPROM

IC401

INPUT4/5

HDMI IN 1/2

SC402/SC403

R/G/B

SDA SCL

SDA,SCL RR1XC/0/1/2-/+

HDMI Reciever

MST3386

IC8702

HDCP

EEPROM

IC8703

SDA,SCL

EEPROM

IC403/IC40

14.318MHzXtal

L/R

U_D,L_R CLKIN-/+,RIN1/2/3-/+

LVDS

CONNECTER

QS CONNECTER

LCD MODULE

LCD

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[2] OVERALL WIRING DIAGRAM

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– M E M O –

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LC-42BX5H

CHAPTER 8. SCHEMATIC DIAGRAM

[1] DESCRIPTION OF SCHEMATIC DIAGRAM

VOLTAGE MEASUREMENT CONDITION:

1. The voltages at test points are measured on exclusive AC adaptor and the stable supply voltage of AC 110-240V.

Signals are fed by a colour bar signal generator for servicing purpose and the above voltages are measured with a 20k ohm/V tester.

INDICATION OF RESISTOR & CAPACITOR:

RESISTOR

1. The unit of resistance “Ω” is omitted.

(K=kΩ=1000 Ω, M=MΩ).

2. All resistors are ± 5%, unless otherwise noted.

(K= ± 10%, F= ± 1%, D= ± 0.5%)

3. All resistors are 1/16W, unless otherwise noted.

CAPACITOR

1. All capacitors are µF, unless otherwise noted.

(P=pF=µµF).

2. All capacitors are 50V, unless otherwise noted.

LC-42BX5H/M/X

Service Manual

CAUTION:

This circuit diagram is original one, therefore there may be a slight difference from yours.

SAFETY NOTES:

1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS.

2. SEMICONDUCTOR HEAT SINKS SHOULD BE REGARDED AS POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPERATING.

IMPORTANT SAFETY NOTICE:

PARTS MARKED WITH “ ” ( ) ARE IMPORTANT FOR MAINTAINING THE SAFETY OF THE SET. BE SURE TO REPLACE THESE PARTS WITH SPECIFIED ONES FOR MAINTAINING THE SAFETY AND PERFORMANCE OF THE SET.

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[2] SCHEMATIC DIAGRAM

1. VIDEO-IN3 Unit

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2. RED, R/C Unit

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3. OPERATION Unit

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4. MAIN Unit

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5. SUB Unit

(1/8) (1/8) Please peel off and refer to page 8-38. (2/8) (2/8) Please peel off and refer to page 8-39

(5/8) (5/8) Please peel off and refer to page 8-42. (6/8) (6/8) Please peel off and refer to page 8-43.

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