Jvc Lt-42hb1bu User manual

SERVICE MANUAL

2009/7

INTEGRATED DIGITAL TERRESTRIAL/SATELLITE LCD TELEVISION

YA707<Rev.001>20097SERVICE MANUAL

LT-42HB1BU/AX

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1-2 (No.YA707<Rev.001>)

Design & specifications are subject to change without notice.

Items Contents

Dimensions (W ×H ×D) [Without stand] 101.4 cm ×63.55 cm ×27.86 cm [101.4 cm ×64.65 cm ×10.87 cm]

Mass [Without stand] 22.7 kg [21.42 kg]

Power Input AC220 V - AC240 V, 50 Hz

Power Consumption 170 W (Standby: 0.8 W)

TV RF System Analog CCIR (B/G, I, D/K, L)

Digital DVB-T / DVB-S

Colour System PAL, SECAM, NTSC 3.58/4.43 [EXT only]

Stereo System NICAM (B/G, I, D/K, L), A2 (B/G, D/K)

Receiving

Frequency

Analog VHF: 45.25 MHz - 470MHz

UHF: 470 MHz - 855.25 MHz

CATV: 116MHz - 172MHz / 220 MHz - 469 MHz

Digital Terrestrial: 474 MHz - 858 MHz(UHF), 177.5 MHz - 6.5 MHz (VHF)

Satellite: 950 MHz - 2150 MHz

Intermediate

Frequency

VIF 38.9 MHz (B/G, I, D/K, L)

SIF 33.4 MHz (5.5 MHz:B/G)

32.9 MHz (6.0 MHz:I)

32.4 MHz (6.5MHz:D/K)

Colour Sub

Carrier Frequency

PAL 4.43MHz

SECAM 4.40625 MHz / 4.25 MHz

NTSC 3.58 MHz / 4.43 MHz

Teletext System Analog FLOF (Fastext), TOP

Digital EBU TEXT

LCD panel 42 V-inch wide aspect (16 : 9)

Screen Size Diagonal : 107.0 cm (H: 93.0 cm ×V:52.32 cm)

Display Pixels Horizontal : 1920 dots ×Vertical : 1080 dots

Audio Power Output 10 W + 10 W

Speaker 4.0 cm ×20.0 cm, oval type ×2

Aerial terminal (VHF/UHF/BS) 75 Ωunbalanced, coaxial ×2

EXT-1 / EXT-2 (Input/Output) 21-pin Euro connector (SCART socket ) ×2

EXT-3

(Input)

Component Video

750p / 1125i

625p / 525p / 625i / 525i

RCA pin jack ×3

Y: 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75 Ω/ Pb/Pr: ±0.35V(p-p), 75 Ω

Y: 1 V (p-p), Positive (Negative sync.), 75 Ω/ Cb/Cr: 0.7 V(p-p), 75 Ω

Audio 500 mV(rms) (-4dBs), high impedance, RCA pin jack ×2

EXT-4

(Input)

S-Video Mini-DIN 4 pin ×1

Y: 1 V (p-p), Positive (Negative sync provided), 75 Ω

C: 0.286 V (p-p) (Burst signal), 75 Ω

Video 1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack ×1

Audio 500 mV (rms), High impedance, RCA pin jack ×2

EXT-5 / EXT-6 / EXT-7

(Digital Input)

Video / Audio HDMI 2-row 19pin connector ×3

(Digital-input terminal is not compatible with picture signals of personal computer)

• 576i(625i),576p(625p),480i(525i),480p(525p),720p(750p),1080i(1125i) signals are

available.

• All HDMI inputs support DVI video but only first HDMI input (EXT-5) supports DVI audio

through component audio input (EXT-2 or EXT-3).

PC (RGB) Input Video D-sub 15 pin ×1

R/G/B : 0.7 V (p-p), 75Ω

HD / VD : 1 V (p-p) to 5 V (p-p), high impedance

Audio 3.5 mm stereo mini jack ×1

Digital Audio Optical Output Digital SPDIF ×1

Headphone 3.5 mm stereo mini jack ×1

Remote Control Unit RM-C2503 (AAA/R03 dry cell battery ×2)

(No.YA707<Rev.001>)1-3

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety

purposes. For continued protection, no changes should be

made to the original design unless authorized in writing by

the manufacturer. Replacement parts must be identical to

those used in the original circuits. Service should be

performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void

the manufacturer's warranty and will further relieve the

manufacturer of responsibility for personal injury or

property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These

characteristics are often not evident from visual inspection

nor can the protection afforded by them necessarily be

obtained by using replacement components rated for

higher voltage, wattage, etc. Replacement parts which

have these special safety characteristics are identified in

the parts list of Service manual. Electrical components

having such features are identified by shading on the

schematics and by ( ) on the parts list in Service

manual. The use of a substitute replacement which does

not have the same safety characteristics as the

recommended replacement part shown in the parts list of

Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and

ISOLATED (NEUTRAL) side ground or EARTH side

ground when repairing.

Some model's power circuit is partly different in the GND.

The difference of the GND is shown by the LIVE : ( ) side

GND, the ISOLATED (NEUTRAL) : ( ) side GND and

EARTH : ( ) side GND.

Don't short between the LIVE side GND and ISOLATED

(NEUTRAL) side GND or EARTH side GND and never

measure the LIVE side GND and ISOLATED (NEUTRAL)

side GND or EARTH side GND at the same time with a

measuring apparatus (oscilloscope etc.). If above note will

not be kept, a fuse or any parts will be broken.

(5) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead

dress in the high voltage circuit area. Where a short circuit

has occurred, those components that indicate evidence of

overheating should be replaced. Always use the

manufacturer's replacement components.

(6) Isolation Check (Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isola-

tion check on the exposed metal parts of the cabinet (an-

tenna terminals, video/audio input and output terminals,

Control knobs, metal cabinet, screw heads, earphone jack,

control shafts, etc.) to be sure the product is safe to operate

without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal

parts exposed to the user, particularly any exposed metal

part having a return path to the chassis should withstand a

voltage of 3000V AC (r.m.s.) for a period of one second. (.

. . . Withstand a voltage of 1100V AC (r.m.s.) to an appli-

ance rated up to 120V, and 3000V AC (r.m.s.) to an appli-

ance rated 200V or more, for a period of one second.)

This method of test requires a test equipment not generally

found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use

a line isolation transformer during this check.). Using a

"Leakage Current Tester", measure the leakage current

from each exposed metal part of the cabinet, particularly

any exposed metal part having a return path to the chassis,

to a known good earth ground (water pipe, etc.). Any leak-

age current must not exceed 0.5mA AC (r.m.s.).

However, in tropical area, this must not exceed 0.2mA AC

(r.m.s.).

Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not

use a line isolation transformer during this check.). Use

an AC voltmeter having 1000Ωper volt or more

sensitivity in the following manner. Connect a 1500Ω

10W resistor paralleled by a 0.15µF AC-type capacitor

between an exposed metal part and a known good earth

ground (water pipe, etc.). Measure the AC voltage

across the resistor with the AC voltmeter. Move the

resistor connection to each exposed metal part,

particularly any exposed metal part having a return path

to the chassis, and measure the AC voltage across the

resistor. Now, reverse the plug in the AC outlet and

repeat each measurement. Any voltage measured must

not exceed 0.75V AC (r.m.s.). This corresponds to

0.7mA AC (r.m.s.).

However, in tropical area, this must not exceed 0.35V

AC (r.m.s.). This corresponds to 0.3mA AC (r.m.s.).

AC VOLTMETER

(HAVING 1000 /V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1500 10W

0.15 F AC-TYPE

GOOD EARTH GROUND

1-4 (No.YA707<Rev.001>)

1.2 INSTALLATION

1.2.1 HEAT DISSIPATION

If the heat dissipation vent behind this unit is blocked, cooling

efficiency may deteriorate and temperature inside the unit will

rise. The temperature sensor that protects the unit will be

activated when internal temperature exceeds the pre-determined

level and power will be turned off automatically.Therefore,

please make sure pay attention not to block the heat dissipation

vent as well as the ventilation outlet behind the unit and ensure

that there is room for ventilation around it.

1.2.2 NOTES ON HANDLING

When taking the unit out of a packing case, do not grasp the

upper part of the unit. If you take the unit out while grasping the

upper part, the LCD PANEL may be damaged because of a

pressure. Instead of grasping the upper part, put your hands on

the lower backside or sides of the unit.

1.2.3 INSTALLATION REQUIREMENTS

Ensure that the minimal distance is maintained, as specified

below, between the unit with and the surrounding walls, as well

as the floor etc.Install the unit on stable flooring or stands.

To ensure safety in an emergency such as an earthquake, and

to prevent accidents, ensure that measures are taken to prevent

the TV dropping or falling over.

Ventilation hole

*Diagram differs from actual appearance.

200 mm

150 mm 50 mm 150 mm 50 mm

It fixes in a band.

TV STAND

*Diagram differs from actual appearance.

(No.YA707<Rev.001>)1-5

1.3 HANDLING LCD PANEL

1.3.1 PRECAUTIONS FOR TRANSPORTATION

When transporting the unit, pressure exerted on the internal LCD

panel due to improper handling (such as tossing and dropping)

may cause damages even when the unit is carefully packed. To

prevent accidents from occurring during transportation, pay

careful attention before delivery, such as through explaining the

handling instructions to transporters.

Ensure that the following requirements are met during

transportation, as the LCD panel of this unit is made of glass and

therefore fragile:

(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL

When transporting the LCD panel of the unit, use a special

packing case (packing materials). A special packing case

is used when a LCD panel is supplied as a service spare

part.

(2) ATTACH PROTECTION SHEET TO THE FRONT

Since the front (display part) of the panel is vulnerable,

attach the protection sheet to the front of the LCD panel

before transportation. Protection sheet is used when a LCD

panel is supplied as a service spare part.

(3) AVOID VIBRATIONS AND IMPACTS

The unit may be broken if it is toppled sideways even when

properly packed. Continuous vibration may shift the gap of

the panel, and the unit may not be able to display images

properly. Ensure that the unit is carried by at least 2

persons and pay careful attention not to exert any vibration

or impact on it.

(4) DO NOT PLACE EQUIPMENT HORIZONTALLY

Ensure that it is placed upright and not horizontally during

transportation and storage as the LCD panel is very

vulnerable to lateral impacts and may break. During

transportation, ensure that the unit is loaded along the

traveling direction of the vehicle, and avoid stacking them

on one another. For storage, ensure that they are stacked

in 2 layers or less even when placed upright.

1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)

(1) Avoid placing the unit under direct sunlight over a

prolonged period of time. This may cause the optical filter

to deteriorate in quality and COLOUR.

(2) Clean the filter surface by wiping it softly and lightly with a

soft and lightly fuzz cloth (such as outing flannel).

(3) Do not use solvents such as benzene or thinner to wipe the

filter surface. This may cause the filter to deteriorate in

quality or the coating on the surface to come off. When

cleaning the filter, usually use the neutral detergent diluted

with water. When cleaning the dirty filter, use water-diluted

ethanol.

(4) Since the filter surface is fragile, do not scratch or hit it with

hard materials. Be careful enough not to touch the front

surface, especially when taking the unit out of the packing

case or during transportation.

1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR

PARTS

Take note of the following when replacing exterior parts (REAR

COVER, FRONT PANEL, etc.):

(1) Do not exert pressure on the front of the LCD panel (filter

surface). It may cause irregular COLOUR.

(2) Pay careful attention not to scratch or stain the front of the

LCD panel (filter surface) with hands.

(3) When replacing exterior parts, the front (LCD panel) should

be placed facing downward. Place a mat, etc. underneath

to avoid causing scratches to the front (filter surface).

1-6 (No.YA707<Rev.001>)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

DIGITAL TUNER

This TV can receive both DVB-T (Digital terrestrial broadcasting),

DVB-S(Digital satellite broadcasting), and Analogue terrestrial

broadcasting.

HDMI INPUT

By connecting a HDMI compatible device, high definition

pictures can be displayed on your TV in their digital form.

PICTURE MODE

This function can adjust the picture settings automatically.

There are BRIGHT, STANDARD, SOFT and MANUAL in the

PICTURE MODE.

ZOOM

This function can change the screen size according to the

picture aspect ratio.

3D CINEMA SURROUND

You can enjoy sounds with a wider ambience.

2.2 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2

(P-P= Peak to Peak, B-W= Blanking to white peak)

Pin No. Signal designation Matching value EXT-1 EXT-2

1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)

2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)

3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)

4 AUDIO GND Used Used

5 GND (B) Used Used

6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)

7 B input 700mV(B-W), 75ΩUsed Not used

8 FUNCTION SW

(SLOW SW)

Low : 0V-3V

High : 8V-12V, High impedance

Used Used

9 GND (G) Used Used

10 SCL Not used Used (SCL2)

11 G input 700mV(B-W), 75ΩUsed Not used

12 SDA Not used Used (SDA2)

13 GND (R) Used Used

14 GND (YS) Used Not used

15 R / C input R : 700mV(B-W), 75Ω

C : 300mV(P-P), 75ΩUsed (R) Used (C2)

16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75ΩUsed Not used

17 GND (VIDEO output) Used Used

18 GND (VIDEO input) Used Used

19 VIDEO output 1V(P-P) (Negative sync), 75ΩUsed (TV OUT) Used (LINE OUT)

20 VIDEO / Y input 1V(P-P) (Negative sync), 75ΩUsed Used

21 COMMON GND Used Used

20 18 16 14 12 10 8 6 4 2

21 19 17 15 13 11 9 7 5 3 1

[Pin assignment]

(No.YA707<Rev.001>)1-7

2.3 TECHNICAL INFORMATION

2.3.1 LCD PANEL

This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the

conventional CRT (Cathode Ray Tube), as a display unit.

Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light

does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

2.3.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

2.3.1.2 PIXEL FAULT

There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

BRIGHT FAULT

In this pixel fault, a cell that should not light originally is lighting on and off.

For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

DARK FAULT

In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting.

For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

FLICKER FAULT

In the pixel fault, a cell that should light originally or not light originally is flashing on and off.

For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on

and off.

Item Specifications

Maximum dimensions ( W ×H ×D ) 983.0 mm ×576.0 mm ×52.7 mm

Weight 13.6 kg

Effective screen size Diagonal : 107.0 cm (H: 93.0 cm ×V:52.32 cm)

Aspect ratio 16 : 9

Drive device / system a-Si-TFT active matrix system

Resolution Horizontally 1920 ×Vertically 1080 ×RGB < W-XGA > 6220800 dots in total

Pixel pitch (pixel size) Horizontally: 0.4845 mm, Vertically: 0.4845 mm

Displayed color 1073.7 million colors 256 colors for R G and B

Brightness 500 cd/m2

Contrast ratio 5000 : 1

Response time ( G to G ) less than 5.5 ms

View angle (Horizontally) 178°

View angle (Vertically) 178°

Surface polarizer Anti-Glare type Low reflective coat

Color filter Vertical stripe

Backlight Cold cathode fluorescent lamp

Power supply voltage in LCD 12 V

Power supply voltage in inverter 24 V

Panel interface system LVDS (Low Voltage Differential Signaling)

1-8 (No.YA707<Rev.001>)

SECTION 3

DISASSEMBLY

3.1 CAUTION AT DISASSEMBLY

• Make sure that the power cord is disconnected from the outlet.

• Pay special attention not to break or damage the parts.

• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.

• Be sure to reattach the wire clamps removed during the procedure to the original positions. (Attaching the wire clamps in wrong

positions may affect the performance.)

REFERENCE:

When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points

(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit

Diagram.

3.2 DISASSEMBLY PROCEDURE

3.2.1 REMOVING THE REAR COVER (Fig.3-1)

(1) Remove the 16 screws [A].

(2) Remove the REAR COVER.

3.2.2 REMOVING THE POWER UNIT (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 4 screws [B].

(2) Remove the POWER UNIT.

3.2.3 REMOVING THE MAIN PWB (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 1 screw [C].

(2) Remove the SIDE SHIELD.

(3) Remove the 6 screws [D].

(4) Remove the MAIN PWB.

3.2.4 REMOVING THE KEY PWB (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 1 screws [E].

(2) Remove the CONTROL BASE and KEY PWB together.

(3) Remove the 2 screws [F].

(4) Remove the KEY PWB from the CONTROL BASE.

3.2.5 REMOVING THE INVERTER PWB (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 6 screws [G].

(2) Remove the INVERTER PWB COVER.

(3) Remove the INVERTER PWB.

3.2.6 REMOVING THE POWER BRACKET (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 2 screws [H].

(2) Remove the POWER BRACKET.

3.2.7 REMOVING THE SPEAKER (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the SPEAKER(x2).

3.2.8 REMOVING BACK BRACKET (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 4 screws [J].

(2) Remove the BACK BRACKET.

3.2.9 REMOVING THE IR PWB (Fig.3-1)

• Remove the REAR COVER.

(1) Remove the 1 screw [K].

(2) Remove the IR PWB.

3.2.10 REMOVING THE STAND (Fig.3-1)

(1) Remove the 4 screws [L].

(2) Remove the STAND.

3.2.11 REMOVING THE LCD CONTROL PWB (Fig.3-1)

• Remove the REAR COVER.

• Remove the STAND.

(1) Remove the 5 screws [L], 2 screws [M] and 5 screws [N].

(2) Remove the MAIN SHIELD.

(3) Remove the 6 screws [P].

(4) Remove the LCD CONTROL PWB.

3.2.12 REMOVING THE LED PWB (Fig.3-1)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the MAIN SHIELD.

(1) Remove the 2 screws [Q] and 2 screws [R].

(2) Remove the BOTTOM FRAME.

(3) Remove the 2screws [S].

(4) Remove the LED PWB.

3.2.13 REMOVING THE LCD PANEL UNIT (Fig.3-1)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the MAIN SHIELD.

• Remove the BOTTOM FRAME.

• Remove the IR PWBand PANEL BRACKET together.

(1) Remove the 3 screws [T].

(2) Remove the PANEL BRACKET(x3).

(3) Remove the LCD PANEL UNIT.

(No.YA707<Rev.001>)1-9

Fig.3-1

LCD CONTROL

PWB COVER

INVERTER

PWB COVER

STAND

SIDE SHIELD

MAIN PWB

POWER

BRACKET

SPEAKER

POWER UNIT

REAR COVER

LCD PANEL

PANEL

BRACKET

CONTROL

KNOB

FRONT CABINET

PANEL BRACKET

MAIN SHIELD

BOTTOM FRAME

SUPPORT

BRACKET

SLED PWB

IR PWB K

PANEL BRACKET

KEY PWB

INVERTER PWB

LCD CONTROL

PWB

1-10 (No.YA707<Rev.001>)

3.3 MEMORY IC REPLACEMENT

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video and drive circuits.

• When replacing, be sure to use an IC containing this (initial value) data.

3.3.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug from the AC outlet.

2. Replace the memory IC

Be sure to use the memory IC written with the initial setting values.

3. Power on

Connect the power plug to the AC outlet and switch on the power.

4. Receiving channel setting

Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.

5. User setting

Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING

INSTRUCTIONS and set the items as described.

6. FACTORY MODE setting

Verify what to set in the FACTORY MODE, and set whatever is necessary.

3.3.2 FACTORY MODE SETTING

FACTORY MODE SCREEN SETTING ITEM

FACTORY MODE SCREEN

Factory Menu

ADC Calibration

White Balance

Miscellaneous

Engineering Menu

Panel Select xxxxxxxxxxx

Factry Default

Model Name : xxxxxx

Software Version : xxxxxx

OTA Loader Version : xxxxxx

MCU Version : xxxxxx

System Version : xxxxxx

Kernel Version : xxxxxx

Boot Loader Version : xxxxxx

Update Date : xxxxxx

Setting items Settings

ADC Calibration [Do not adjust]

White Balance Adjust

Miscellaneous [Do not adjust]

Engineering Menu [Do not adjust]

Panel Select [Do not adjust]

Factory Default ---

(No.YA707<Rev.001>)1-11

3.3.3 SETTINGS OF FACTORY SHIPMENT

3.3.3.1 BUTTON OPERATION 3.3.3.2 REMOTE CONTROL DIRECT OPERATION

3.3.3.3 REMOTE CONTROL MENU OPERATION

(1) Picture

(2) Sound

(3) Installation

(4) Feature

Setting item Setting position

POWER Off

CHANNEL PR1

VOLUME 10

AV TV

Setting item Setting position

CHANNEL PR1

VOLUME 10

ZOOM AUTO

SUB POWER OFF

Setting item Setting position

Mode Bright

Colour Temperature Cool

Noise Reduction Low

Fleshtone Off

24p Cinema On

Setting item Setting position

Bass 0

Treble 0

Balance 0

Auto Volume Control Off

Digital Audio Output PCM

3D Cinema surround Off

TV Speaker On

Setting item Setting item Setting position

Terrestrial Channel

Antenna Power Off

Auto Channel

Numbering

Enable

Satellite Channel

Antenna Type LNB Only

Software Update ---

Edit Channel List ---

Edit Favourite List ---

Signal Detection ---

Setting item Setting position

Language Setting Menu Language English

Audio Language German

Subtitle Language German

Subtitle Display Auto

Subtitle Font Variable

Audio Description Off

Time Setting Date --/--/20--

Local Time --:--

Sleep Timer Off

Power On Timer Off

Channel ---

Volume 20

Power Off Timer Off

Auto Shut Off Off

Parental Control Child Lock Disable

Maturity Rating View All

Change PIN Code ---

PC ---

Other Settings Zoom Auto

4 : 3 Aspect Setting Panoramic

OSD Transparency 30%

Blue Back Off

Power Lamp On

Control with HDMI On

Auto Demonstration

Off

1-12 (No.YA707<Rev.001>)

3.4 REPLACEMENT OF CHIP COMPONENT

3.4.1 CAUTIONS

(1) Avoid heating for more than 3 seconds.

(2) Do not rub the electrodes and the resist parts of the pattern.

(3) When removing a chip part, melt the solder adequately.

(4) Do not reuse a chip part after removing it.

3.4.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it.

(2) A 30w soldering iron is recommended for easily removing parts.

3.4.3 REPLACEMENT STEPS

1. How to remove Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove

the chip part.

NOTE :

After removing the part, remove remaining solder from the

pattern.

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the

chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead Aas indicated in the figure.

(4) Then solder leads Band C.

SOLDER SOLDER

(No.YA707<Rev.001>)1-13

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) This TV is adjusted by using REMOTE CONTROL UNIT.

(2) The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values

which adjust the screen to the optimum condition can be different from the initial setting values.

(3) Make sure that connection is correctly made AC to AC power source.

(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.

(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service

adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the

following functions with the REMOTE CONTROL UNIT.

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator)[PAL]

• Remote control unit

4.4 ADJUSTMENT ITEMS

VIDEO CIRCUIT

• WHITE BALANCE adjustment

4.5 BASIC OPERATION OF FACTORY MODE

4.5.1 HOW TO ENTER THE FACTORY MODE

(1) Press [INFORMATION] key and [MUTING] key on the

remote control unit simultaneously to enter the FACTORY

MODE SCREEN. (Fig.4-1)

4.5.2 HOW TO EXIT THE FACTORY MODE

Press the [OK] key to exit the factory mode.

4.5.3 CHANGE AND MEMORY OF SETTING VALUE

SELECTION OF SETTING ITEM

•[FUNCTION /] key.

For scrolling up / down the setting items.

•[FUNCTION /]key.

For select the setting items.

CHANGE OF SETTING VALUE (DATA)

•[FUNCTION /]key.

For scrolling up / down the setting values.

MEMORY OF SETTING VALUE (DATA)

The setting value will be stored automatically when release the

REMOTE CONTROL UNIT keys.

4.5.4 FACTORY MODE SELECT KEY LOCATION

Setting item Settings position

Picture Mode Standard

Colour Temperature Normal

Fig.4-1

FACTORY MODE SCREEN

Factory Menu

ADC Calibration

White Balance

Miscellaneous

Engineering Menu

Panel Select xxxxxxxxxxx

Factry Default

Model Name : xxxxxx

Software Version : xxxxxx

OTA Loader Version : xxxxxx

MCU Version : xxxxxx

System Version : xxxxxx

Kernel Version : xxxxxx

Boot Loader Version : xxxxxx

Update Date : xxxxxx

[FUNCTION /] key

[Function/] key

[MUTING] key +

[INFORMATION] key

Enter The Factry Mode.

Scrolling up / down the

setting value. Select the setting item.

1-14 (No.YA707<Rev.001>)

4.6 ADJUSTMENT PROCEDURE

4.6.1 VIDEO CIRCUIT

Item Measuring

instrument Test point Adjustment part Description

WHITE

BALANCE

Remote

control unit

Signal

generator

[White Balance]

Normal R

Normal G

Normal B

(1) Set COLOUR TEMP. to "Normal".

(2) Enter the FACTRY MODE.

(3) Press []/ []key on the remote control unit

simultaneously to select the White balance.

(4) Press []key on the remote control unit

simultaneously to enter White balnce mode.

(5) Receive a PAL 75% all white signal.

(6) Adjust the setting values of <Normal R>,

<Normal G> and <Normal B> so that the

screen becomes maximum white.

NOTE:

When the normal mode is adjusted, other modes

(cool/ warm) are automatically adjusted.

WHITE BALANCE MODE

White Balance

Color Temp Normal

R XX

G XX

B XX

FACTORY MODE SCREEN

Factory Menu

ADC Calibration

White Balance

Miscellaneous

Engineering Menu

Panel Select xxxxxxxxxxx

Factry Default

Model Name : xxxxxx

Software Version : xxxxxx

OTA Loader Version : xxxxxx

MCU Version : xxxxxx

System Version : xxxxxx

Kernel Version : xxxxxx

Boot Loader Version : xxxxxx

Update Date : xxxxxx

(No.YA707<Rev.001>)1-15

SECTION 5

TROUBLESHOOTING

5.1 SOFTWARE UPDATE PROCEDURE

In case of writing the software on the Main PWB that is not

contained the software, or in case of the software update is

required, please write the software by the following procedure.

5.1.1 REQUIRED EQUIPMENT

• PC (Equipped with an RS-232C TERMINAL)

• Writing tool (Download the data from JS-net.)

• Program data (Download the data from JS-net.)

• RS-232C JIG cable (Part number: HU-0130200004)

(Female to 3.5mm stereo mini plug cable)

NOTE:

Please confirm SMIS on the JVC Service Information Network

or confirm to your local JVC subsidiary / dealer for software

version.

5.1.2 PROGRAM DATA WRITING PROCEDURE

(7) Turn the power of the main unit OFF.

(8) Unzip Writing tool into your PC.

These 5 files will be unzipped in the folder.

(9) Unzip Program data into your PC.

(10) Connect PC and TV (service only port on rear side of your

TV) with RS-232C JIG cable.

(11) Click WDN4OAK.exe. You will see the following program.

(12) Select the proper COM port to download Software from

your PC. (Default: COM1)

(13) To select hdf file, click the yellow folder button.

(14) See the below picture and double click correct hdf file.

(15) Click the "DownLoad" button to start downloading.

(16) You will see the downloading status bar.

(17) Turn on your TV.

(18) After you finish the downloading, the status bar will be dis-

appeared.

(19) During the download, TV will display a downloading status

OSD and it will be disappeared when you finish the down-

(20) Unplug the AC power and wait for a few seconds, then plug

in to the AC power.

(21) Go to the Main menu →TV Setting →Feature →System

Status. You can check the Software version before and af-

ter the downloading.

(No.YA707<Rev.001>)

VSE

Printed in Japan

Victor Company of Japan, Limited

Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

DVD-ROM No.SML2009Q1

2009/7

SCHEMATIC DIAGRAMS

INTEGRATED DIGITAL TERRESTRIAL/SATELLITE LCD TELEVISION

LT-42HB1BU/AX

(No.YA707<Rev.001>)2-1

5.NOTE FOR REPAIRING SERVICE

This model's power circuit is partly different in the GND. The

difference of the GND is shown by the LIVE : ( ) side GND and the

ISOLATED(NEUTRAL): ( ) side GND. Therefore, care must be

taken for the following points.

(1)Do not touch the LIVE side GND or the LIVE side GND and the

ISOLATED(NEUTRAL)side GND simultaneously. if the above

caution is not respected, an electric shock may be caused.

Therefore, make sure that the power cord is surely removed from

the receptacle when, for example, the chassis is pulled out.

(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL)

side GND or never measure with a measuring apparatus measure

with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND

and ISOLATED(NEUTRAL)side GND at the same time.

If the above precaution is not respected, a fuse or any parts will be broken.

Since the circuit diagram is a standard one, the circuit and

circuit constants may be subject to change for improvement

without any notice.

NOTE

Due improvement in performance, some part numbers show

in the circuit diagram may not agree with those indicated in

the part list.

When ordering parts, please use the numbers that appear

in the Parts List.

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

(7)Ground symbol

: LIVE side ground

: ISOLATED(NEUTRAL)side ground

: EARTH ground

: DIGITAL ground

(6)Connecting method

: Connector : Wrapping or soldering

: Receptacle

(5)Test point

: Test point : Only test point display

Respective voltage values are indicated

: B1

: 9V : 5V

: B2 (12V)

(4)Power Supply

Type

MM : Metalized mylar capacitor

PP : Polypropylene capacitor

MPP : Metalized polypropylene capacitor

MF : Metalized film capacitor

TF : Thin film capacitor

BP : Bipolar electrolytic capacitor

TAN : Tantalum capacitor

(3)Coils

No unit

Others

: [µH]

: As specified

No indication : Ceramic capacitor

(2)Capacitors

Capacitance value

1 or higher : [pF]

less than 1 : [µF]

Withstand voltage

No indication : DC50[V]

Others : DC withstand voltage [V]

AC indicated : AC withstand voltage [V]

Electrolytic Capacitors

47/50[Example]: Capacitance value [µF]/withstand voltage[V]

Composition resistor 1/2 [W] is specified as 1/2S or Comp.

Type

No indication : Carbon resistor

OMR : Oxide metal film resistor

MFR : Metal film resistor

MPR : Metal plate resistor

UNFR : Uninflammable resistor

FR : Fusible resistor

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit : [Ω]

K: [kΩ]

Rated allowable power

No indication : 1/16 [W]

Others : As specified

: [MΩ]

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board : R1209 R209

1.SAFETY

The components identified by the symbol and shading are

critical for safety. For continued safety replace safety ciritical

components only with manufactures recommended parts.

Since the voltage values of signal circuit vary to some extent

according to adjustments, use them as reference values.

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the

following conditions.

(1)Input signal : Colour bar signal

(2)Setting positions of

each knob/button and

variable resistor

(3)Internal resistance of tester : DC 20kΩ/V

(4)Oscilloscope sweeping time : H 20µs / div

: V 5ms / div

: Othters Sweeping time is

specified

(5)Voltage values : All DC voltage values

: Original setting position

when shipped

LT-42HB1BU/AX

SEMICONDUCTOR SHAPES

CONTENTS

SEMICONDUCTOR SHAPES......................................................................2-2

WIRING DIAGRAM .......................................................................................2-3

BLOCK DIAGRAM........................................................................................2-5

BLOCK DIAGRAM [MPEG4 BLOCK].........................................................2-7

CIRCUIT DIAGRAMS ...................................................................................2-9

MAIN PWB CIRCUIT DIAGRAM ................................................................................................................. 2-9

IR PWB CIRCUIT DIAGRAM .................................................................................................................. 2-101

KEY PWB CIRCUIT DIAGRAM............................................................................................................... 2-103

LED PWB CIRCUIT DIAGRAM ............................................................................................................... 2-105

PATTERN DIAGRAMS ............................................................................ 2-107

MAIN PWB PATTERN ............................................................................................................................ 2-107

IR PWB PATTERN.................................................................................................................................. 2-111

KEY PWB PATTERN .............................................................................................................................. 2-111

LED PWB PATTERN .............................................................................................................................. 2-111

USING P.W. BOARD

BOTTOM VIEW FRONT VIEW TOP VIEW

1 N

OUT

IN OUTE

1 N

TOP VIEW

CHIP IC

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW