JVC LT-42DA9BN, LT-42DA9BU, LT-42DA9BJ Service Manual

SERVICE MANUAL

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

YA608<Rev.002>20087SERVICE MANUAL

LT-42DA9BJ, LT-42DA9BN, LT-42DA9BU

No.YA605: LT-19DA9/19DB9 series No.YA606: LT-26DA9/26DB9 series

No.YA607

No.YA609

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

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

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

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

: LT-32DA9/32DB9 series No.YA608: LT-42DA9/42DB9 series

: LT-26DE9 series No.YA610: LT-32DE9 series

TABLE OF CONTENTS

No.YA608<Rev.002>

2008/7

SPECIFICATION

Contents

Items

Dimensions ( W × H × D ) 101.4 cm × 69.4 cm × 29.6 cm [101.4 cm × 64.7 cm × 10.9 cm (Without stand)]

Mass 22.5 kg [20.2 kg (Without stand)]

Power Input AC220V - AC240 V, 50 Hz

Power Consumption 240 W (Standby: 0.9 W)

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

Digital DVB-T

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

Intermediate Frequency

Colour Sub Carrier Frequency

Teletext System

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

Screen Size Diagonal : 106.7 cm (H: 93.0 cm × V: 52.3 cm) Display Pixels Horizontal : 1366 dots × Vertical : 768 dots

Audio Power Output 10 W + 10 W

Speaker 4.0 cm × 20.0 cm, oval type × 2 Aerial terminal (VHF/UHF) 75 Ω unbalanced, coaxial × 1 EXT-1 / EXT-2 (Input/Output) 21-pin Euro connector (SCART socket ) × 2

EXT-3 (Input)

EXT-4 (Input)

EXT-5 / EXT-6 / EXT-7 (Digital Input)

Digital Audio Optical Output Digital SPDIF × 1 Headphone 3.5 mm stereo mini jack × 1 Remote Control Unit RM-C1892B (AA/R6 dry cell battery × 2)

Component Video

625p / 525p / 625i / 525i

Analog VHF: 46.25 MHz - 470MHz

UHF: 470 MHz - 855.25 MHz CATV: 116MHz - 172MHz / 220MHz - 469MHz

Digital UHF:474 MHz - 858 MHz

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

SIF 33.4MHz (5.5MHz:B/G)

32.9MHz (6.0MHz:I)

32.4MHz (6.5MHz:D/K)

PAL 4.43MHz

SECAM 4.40625MHz / 4.25MHz

NTSC 3.58MHz / 4.43MHz

Analog FLOF (Fastext), TOP

Digital MHEG 5 UK profile EBU TEXT

RCA pin jack × 3

750p / 1125i

S-Video Mini-DIN 4 pin × 1

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

Y: 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75Ω / Pb/Pr: ±0.35V(p-p), 75 Ω Y: 1 V (p-p), Positive (Negative sync.), 75 Ω / Cb/Cr: 0.7V(p-p), 75 Ω

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

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

(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.

LT-42DA9BJ

LT-42DA9BN LT-42DA9BU

Design & specifications are subject to change without notice.

1-2 (No.YA608<Rev.002>)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]

(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 isolation check on the exposed metal parts of the cabinet (antenna 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 appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance 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 leakage 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 1000Ω per 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)

0.15 F AC-TYPE

GOOD EARTH GROUND

1500 10W

PLACE THIS PROBE ON EACH EXPOSED ME TAL PAR T

(No.YA608<Rev.002>)1-3

1.2 SAFETY PRECAUTIONS [FOR UK]

(1) The design of this product contains special hardware and 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 product 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 product have special safety-related characteristics. These characteristics are often

not evident from visual inspection nor can the protection afforded by them necessary 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,

high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

WARNING

(1) The equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (3) Repairs must be made in accordance with the relevant safety standards. (4) It is essential that safety critical components are replaced by approved parts. (5) If mains voltage selector is provided, check setting for local voltage.

1.3 INSTALLATION

1.3.1 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.

Ventilation hole

*Diagram differs from actual appearance.

1.3.2 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.

1.3.3 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.Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.

200 mm

150 mm 50

*Diagram differs from actual appearance.

150 mm 50 mm

1-4 (No.YA608<Rev.002>)

1.3.4 INSTALLATION REQUIREMENTS

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.

It fixes in a band.

TV STAND

*Diagram differs from actual appearance.

1.4.2 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.

1.4 HANDLING LCD PANEL

1.4.1 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.

1.4.3 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).

(No.YA608<Rev.002>)1-5

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: DB9 only) 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.

2.2 MAIN DIFFERENCE LIST

Contents

Items

LT-42DA9BJ

Teletext System (Digital) MHEG 5 UK profile EBU TEXT

2.3 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2

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.

HYPER SOUND

You can enjoy sounds with a wider ambience.

LT-42DA9BN LT-42DA9BU

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

8 FUNCTION SW

(SLOW SW)

9 GND (G) Used Used

10 SCL Not used Used (SCL2)

11 G input 700mV

12 SDA Not used Used (SDA2)

13 GND (R) Used Used

14 GND (YS) Used Not used

15 R / C input R : 700mV

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

17 GND (VIDEO output) Used Used

18 GND (VIDEO input) Used Used

19 VIDEO output 1V

20 VIDEO / Y input 1V

21 COMMON GND Used Used

Low : 0V-3V High : 8V-12V, High impedance

C : 300mV

(P-P)

, 75Ω Used Not used

(B-W)

Used Used

, 75Ω Used Not used

(B-W)

, 75Ω

(B-W)

, 75Ω

(P-P)

(Negative sync), 75Ω Used (TV OUT) Used (LINE OUT) (Negative sync), 75Ω Used Used

Used (R) Used (C2)

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

[Pin assignment]

20 18 16 14 12 10 8 6 4 2

21 19 17 15 13 11 9 7 5 3 1

1-6 (No.YA608<Rev.002>)

2.4 TECHNICAL INFORMATION

2.4.1 LCD PANEL

This unit uses the flat type LCD (Liquid Crystal Display) panel that occupies little space, instead of using the conventional CRT(Cathode Ray Tube). This panel adopts "normally white" mode where the transmittance or reflective rate is maximum, and the screen is white when no voltage is applied.

2.4.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications

Maximum dimensions ( W × H × D ) 98.3 cm × 57.6 cm × 5.1 cm

Weight 10.5 kg

Effective screen size Diagonal : 106.7 cm (H: 93.0 cm × V: 52.3 cm)

Aspect ratio 16 : 9

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

Resolution Horizontally 1366 × Vertically 768 × RGB < W-XGA > 3147264 dots in total

Pixel pitch (pixel size) Horizontally: 0.227 mm, Vertically: 0.681 mm

Displayed color 16777216 colors 256 colors for R G and B

Brightness 500 cd/m2

Contrast ratio 1000 : 1

Response time 6.5 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 × 20

Power supply voltage in LCD 12 V

Power supply voltage in inverter 24 V

Panel interface system LVDS (Low Voltage Differential Signaling)

2.4.1.2 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.

(No.YA608<Rev.002>)1-7

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.

3.2.7 REMOVING THE SPEAKER (Fig.3-1)

• Remove the REAR COVER. (1) Remove the SPEAKER.

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

• Remove the REAR COVER. (1) Remove the 1 screw [L]. (2) Remove the IR PWB.

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

• Remove the REAR COVER. (1) Remove the 2 screws [C]. (2) Remove the SIDE SHIELD. (3) Remove the 4 screws [D] and 4 screws [E]. (4) Remove the MAIN PWB and MPEG PWB together. (5) Remove the connector connecting the MAIN PWB and

MPEG PWB to separate each board.

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

• Remove the REAR COVER. (1) Remove the 1 screw [F]. (2) Remove the KEY PWB. (3) Remove the 1 screw [G]. (4) Remove the CONTROL BASE.

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

• Remove the REAR COVER. (1) Remove the 5 screws [H]. (2) Remove the INVERTER PWB COVER. (3) Remove the INVERTER PWB(MASTER). (4) Follow the same steps when removing the other hand

INVERTER PWB(SLAVE).

3.2.9 REMOVING THE SUPPORT BRACKET (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 4 screws [M]. (2) Remove the SUPPORT BRACKET.

3.2.10 REMOVING THE STAND (Fig.3-1)

(1) Remove the 2 screws [N]. (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 7 screws [P] and 4 screws [Q]. (2) Remove the MAIN SHIELD. (3) Remove the 4 screws [R]. (4) Remove the LCD CONTROL PWB COVER. (5) 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 [S]. (2) Remove the LED PWB.

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

• Remove the REAR COVER. (1) Remove the 2 screws [J]. (2) Remove the POWER BRACKET.

1-8 (No.YA608<Rev.002>)

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

• Remove the REAR COVER.

• Remove the STAND.

• Remove the MAIN SHIELD. (1) Remove the LCD PANEL UNIT.

REAR

COVER

SIDE

SHIELD

BRACKET

POWER

UNIT

LCD CONTROL

PWB COVER

LCD CONTROL

PWB

POWER

INVERTER

PWB

COVER

SUPPORT

BRACKET

INVERTER

PWB(SLAVE)

TUNER

PWB

MAIN

PWB

MAIN

SHIELD

STAND

INVERTER

PWB

COVER

INVERTER

PWB(MASTER)

KEY PWB

CONTROL

KNOB

LCD PANEL

FRONT

CABINET

LED

MODULE

IR PWB

SPEAKER

Fig.3-1

(No.YA608<Rev.002>)1-9

3.3 MEMORY IC REPLACEMENT

Service

Hardware Ver : REV X.X Sub MCU SW Ver : REV X.X ATV SW Ver : XXXXXX X.XX.XX DTV SW Ver : XXXXXX X.XX.XX Sub MCU Loader Ver : XX.XX DTV Loader Ver : XX.XX ATV Loader Ver : X. X. X System ID : XXXX.XXXX Update Date : XXXX XX XXXX

Right:Enter Back:Return Exit:OK

Video Setup White Balance Spread Spectrum Panel Select <XXXXX> Reset TV-set Factory Default

Right:Enter Back:Return Exit:OK

• 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-1

Service

Right:Enter Back:Return Exit:OK

Press [ ] key

FACTORY MODE SCREEN-2

Video Setup White Balance Spread Spectrum Panel Select <XXXXX> Reset TV-set Factory Default

Right:Enter Back:Return Exit:OK

Setting items Settings

Video Setup [Do not adjust]

White Balance Adjust

Spread Spectrum [Do not adjust]

Panel Select [Do not adjust]

Reset TV-set ---

Factory Default ---

1-10 (No.YA608<Rev.002>)

3.3.3 SETTINGS OF FACTORY SHIPMENT

3.3.3.1 BUTTON OPERATION 3.3.3.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

CHANNEL PR1

VOLUME 10

AV TV

3.3.3.3 REMOTE CONTROL MENU OPERATION

(1) Picture

Setting item Setting position

Mode Bright

Fleshtone Off

Colour Temperature Cool

Noise Reduction High

Backlight High

(2) Sound

Setting item Setting position

Bass 0

Treble 0

Balance 0

AVL On

Hyper Sound Off

(3) Install

Setting item Setting position

Country BJ MODEL: UK

BU/ MODEL: Germany BN MODEL: Finland

Antenna Power Off

Auto Search ---

Manual Search ---

Edit Channels ---

Setting item Setting position

CHANNEL PR1

VOLUME 10

ZOOM AUTO

SUB POWER OFF

(4) Feature

Setting item Setting position

Language BJ MODEL: English

BU MODEL: German BN MODEL: Finnish

Time Setting

Power On Time

Power Off Time

Auto Power Off

Off

Parental Control Disable

OSD Transparency 30

Blue Back Off

Power Lamp On

4 : 3 Aspect Setting Panoramic

(5) APS (in Analog tV Mode only)

Setting item Setting position

Language BJ MODEL: English

BU MODEL: German BN MODEL: Finnish

Antenna Power Off

Country BJ MODEL: UK

BU/ MODEL: Germany BN MODEL: Finland

Channel Search ---

(No.YA608<Rev.002>)1-11

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

2. How to install 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.

SOLDER

[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 A as indicated in the figure.

(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.

1-12 (No.YA608<Rev.002>)

(4) Then solder leads B and C.

SECTION 4

Service

Right:Enter Back:Return Exit:OK

Video Setup White Balance Spread Spectrum Panel Select <XXXXX> Reset TV-set Factory Default

Right:Enter Back:Return Exit:OK

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.

Setting item Settings position

Picture Mode Standard

Colour Temperature Normal

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-1. (Fig.4-1)

(2) Press [] key on the remote control unit simultaneously to

enter the FACTORY MODE SCREEN-2. (Fig.4-1)

4.5.2 HOW TO EXIT THE FACTORY MODE Press the [OK] key to exit the factory mode.

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator)[PAL]

• Remote control unit

FACTORY MODE SCREEN-1

Service

Right:Enter Back:Return Exit:OK

Press [ ] key

FACTORY MODE SCREEN-2

DO NOT ADJUST

Video Setup White Balance Spread Spectrum Panel Select <XXXXX> Reset TV-set Factory Default

Right:Enter Back:Return Exit:OK

Fig.4-1

(No.YA608<Rev.002>)1-13

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

[MUTING] key

[INFORMATION] key

[MENU] key

[FUNCTION /] key

[Function/] key

4.6 SETTING ITEM IN THE FACTORY MODE

Swetting item

Brightness 0 - 100 41 Adjust the Brightness value of Standard mode in Analog TV.

Contrast 0 - 100 68 Adjust the Contrast value of Standard mode in Analog TV.

Standard

Bright

Video Setup RF(Analog TV)

Game

Soft

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in Analog TV.

Colour 0 - 100 58 Adjust the Colour value of Standard mode in Analog TV.

Farbton 0 - 100 0 Adjust the Farbton value of Standard mode in Analog TV.

Brightness 0 - 100 41 Adjust the Brightness value of Bright mode in Analog TV.

Contrast 0 - 100 73 Adjust the Contrast value of Bright mode in Analog TV.

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in Analog TV.

Colour 0 - 100 59 Adjust the Colour value of Bright mode in Analog TV.

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in Analog TV.

Brightness 0 - 100 43 Adjust the Brightness value of Game mode in Analog TV.

Contrast 0 - 100 63 Adjust the Contrast value of Game mode in Analog TV.

Sharpness 0 - 100 65 Adjust the Sharpness value of Game mode in Analog TV.

Colour 0 - 100 58 Adjust the Colour value of Game mode in Analog TV.

Farbton 0 - 100 0 Adjust the Farbton value of Game mode in Analog TV.

Brightness 0 - 100 42 Adjust the Brightness value of Soft mode in Analog TV.

Contrast 0 - 100 63 Adjust the Contrast value of Soft mode in Analog TV.

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in Analog TV.

Colour 0 - 100 58 Adjust the Colour value of Soft mode in Analog TV.

Farbton 0 - 100 0 Adjust the Farbton value of Soft mode in Analog TV.

Variable

range

Default

Value

Comment

1-14 (No.YA608<Rev.002>)

Video Setup

Swetting item

CVBS(EXT-4)

RGB(Digital TV EXT-1 EXT-2)

Standard

Bright

Game

Soft

Standard

Bright

Game

Soft

Variable

range

Brightness 0 - 100 41 Adjust the Brightness value of Standard mode in CVBS(EXT-4).

Contrast 0 - 100 68 Adjust the Contrast value of Standard mode in CVBS(EXT-4).

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in CVBS(EXT-4).

Colour 0 - 100 58 Adjust the Colour value of Standard mode in CVBS(EXT-4).

Farbton 0 - 100 0 Adjust the Farbton value of Standard mode in CVBS(EXT-4).

Brightness 0 - 100 41 Adjust the Brightness value of Bright mode in CVBS(EXT-4).

Contrast 0 - 100 73 Adjust the Contrast value of Bright mode in CVBS(EXT-4).

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in CVBS(EXT-4).

Colour 0 - 100 59 Adjust the Colour value of Bright mode in CVBS(EXT-4).

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in CVBS(EXT-4).

Brightness 0 - 100 43 Adjust the Brightness value of Bright mode in CVBS(EXT-4).

Contrast 0 - 100 63 Adjust the Contrast value of Bright mode in CVBS(EXT-4).

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in CVBS(EXT-4).

Colour 0 - 100 58 Adjust the Colour value of Bright mode in CVBS(EXT-4).

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in CVBS(EXT-4).

Brightness 0 - 100 42 Adjust the Brightness value of Soft mode in CVBS(EXT-4).

Contrast 0 - 100 63 Adjust the Contrast value of Soft mode in CVBS(EXT-4).

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in CVBS(EXT-4).

Colour 0 - 100 58 Adjust the Colour value of Soft mode in CVBS(EXT-4).

Farbton 0 - 100 0 Adjust the Farbton value of Soft mode in CVBS(EXT-4).

Brightness 0 - 100 41 Adjust the Brightness value of Standard mode in RGB(Digital TV EXT-1 EXT-2).

Contrast 0 - 100 68 Adjust the Contrast value of Standard mode in RGB(Digital TV EXT-1 EXT-2).

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in RGB(Digital TV EXT-1 EXT-2).

Colour 0 - 100 58 Adjust the Colour value of Standard mode in RGB(Digital TV EXT-1 EXT-2).

Farbton 0 - 100 0 Adjust the Farbton value of Standard mode in RGB(Digital TV EXT-1 EXT-2).

Brightness 0 - 100 41 Adjust the Brightness value of Bright mode in RGB(Digital TV EXT-1 EXT-2).

Contrast 0 - 100 73 Adjust the Contrast value of Bright mode in RGB(Digital TV EXT-1 EXT-2).

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in RGB(Digital TV EXT-1 EXT-2).

Colour 0 - 100 59 Adjust the Colour value of Bright mode in RGB(Digital TV EXT-1 EXT-2).

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in RGB(Digital TV EXT-1 EXT-2).

Brightness 0 - 100 43 Adjust the Brightness value of Game mode in RGB(Digital TV EXT-1 EXT-2).

Contrast 0 - 100 63 Adjust the Contrast value of Game mode in RGB(Digital TV EXT-1 EXT-2).

Sharpness 0 - 100 65 Adjust the Sharpness value of Game mode in RGB(Digital TV EXT-1 EXT-2).

Colour 0 - 100 58 Adjust the Colour value of Game mode in RGB(Digital TV EXT-1 EXT-2).

Farbton 0 - 100 0 Adjust the Farbton value of Game mode in RGB(Digital TV EXT-1 EXT-2).

Brightness 0 - 100 42 Adjust the Brightness value of Soft mode in RGB(Digital TV EXT-1 EXT-2).

Contrast 0 - 100 63 Adjust the Contrast value of Soft mode in RGB(Digital TV EXT-1 EXT-2).

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in RGB(Digital TV EXT-1 EXT-2).

Colour 0 - 100 58 Adjust the Colour value of Soft mode in RGB(Digital TV EXT-1 EXT-2).

Farbton 0 - 100 0 Adjust the Farbton value of Soft mode in RGB(Digital TV EXT-1 EXT-2).

Default

Value

Comment

(No.YA608<Rev.002>)1-15

Swetting item

Video Setup YC(EXT-4S)

Video Setup COMP(EXT-3)

Standard

Bright

Game

Soft

Standard

Bright

Game

Soft

Variable

range

Brightness 0 - 100 41 Adjust the Brightness value of Standard mode in YC(EXT-4S).

Contrast 0 - 100 68 Adjust the Contrast value of Standard mode in YC(EXT-4S).

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in YC(EXT-4S).

Colour 0 - 100 58 Adjust the Colour value of Standard mode in YC(EXT-4S).

Farbton 0 - 100 0 Adjust the Farbton value of Standard mode in YC(EXT-4S).

Brightness 0 - 100 41 Adjust the Brightness value of Bright mode in YC(EXT-4S).

Contrast 0 - 100 73 Adjust the Contrast value of Bright mode in YC(EXT-4S).

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in YC(EXT-4S).

Colour 0 - 100 59 Adjust the Colour value of Bright mode in YC(EXT-4S).

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in YC(EXT-4S).

Brightness 0 - 100 43 Adjust the Brightness value of Game mode in YC(EXT-4S).

Contrast 0 - 100 63 Adjust the Contrast value of Game mode in YC(EXT-4S).

Sharpness 0 - 100 65 Adjust the Sharpness value of Game mode in YC(EXT-4S).

Colour 0 - 100 58 Adjust the Colour value of Game mode in YC(EXT-4S).

Farbton 0 - 100 0 Adjust the Farbton value of Game mode in YC(EXT-4S).

Brightness 0 - 100 42 Adjust the Brightness value of Soft mode in YC(EXT-4S).

Contrast 0 - 100 63 Adjust the Contrast value of Soft mode in YC(EXT-4S).

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in YC(EXT-4S).

Colour 0 - 100 58 Adjust the Colour value of Soft mode in YC(EXT-4S).

Farbton 0 - 100 0 Adjust the Farbton value of Soft mode in YC(EXT-4S).

Brightness 0 - 100 49 Adjust the Brightness value of Standard mode in COMP(EXT-3).

Contrast 0 - 100 70 Adjust the Contrast value of Standard mode in COMP(EXT-3).

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in COMP(EXT-3).

Colour 0 - 100 60 Adjust the Colour value of Standard mode in COMP(EXT-3).

Farbton 0 - 100 0 Adjust the Farbron value of Standard mode in COMP(EXT-3).

Brightness 0 - 100 49 Adjust the Brightness value of Bright mode in COMP(EXT-3).

Contrast 0 - 100 77 Adjust the Contrast value of Bright mode in COMP(EXT-3).

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in COMP(EXT-3).

Colour 0 - 100 60 Adjust the Colour value of Bright mode in COMP(EXT-3).

Farbton 0 - 100 0 Adjust the Farbron value of Bright mode in COMP(EXT-3).

Brightness 0 - 100 51 Adjust the Brightness value of Game mode in COMP(EXT-3).

Contrast 0 - 100 61 Adjust the Contrast value of Game mode in COMP(EXT-3).

Sharpness 0 - 100 65 Adjust the Sharpness value of Game mode in COMP(EXT-3).

Colour 0 - 100 60 Adjust the Colour value of Game mode in COMP(EXT-3).

Farbton 0 - 100 0 Adjust the Farbron value of Game mode in COMP(EXT-3).

Brightness 0 - 100 50 Adjust the Brightness value of Soft mode in COMP(EXT-3).

Contrast 0 - 100 61 Adjust the Contrast value of Soft mode in COMP(EXT-3).

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in COMP(EXT-3).

Colour 0 - 100 60 Adjust the Colour value of Soft mode in COMP(EXT-3).

Farbton 0 - 100 0 Adjust the Farbron value of Soft mode in COMP(EXT-3).

Default

Value

Comment

1-16 (No.YA608<Rev.002>)

Video Setup

White Balance

Spread Spectrum

Reset TV-Set

Factory Default

Swetting item

Brightness 0 - 100 49 Adjust the Brightness value of Standard mode in HDMI(EXT-5 EXT-6 EXT7)

Contrast 0 - 100 70 Adjust the Contrast value of Standard mode in HDMI(EXT-5 EXT-6 EXT7)

Standard

Bright

HDMI(EXT-5 EXT-6 EXT7)

Game

Soft

Normal R 0 - 100 50 Adjust Red value of Normal Colour Temperature.

Normal

Cool

Warm

SS Enable Yes/No Yes Turn on or off the Spread Spectrum operation

SS Width 0 - 100 15 Adjusting the Width of Spread Spectrum

SS Frequency 0 - 100 100 Adjusting the frequency of Spread Spectrum

Initialize NVM From ROM Press green key to contrinue...

Initialize the set --- --- Initialize the set.

Normal G 0 - 100 31 Adjust Green value of Normal Colour Temperature.

Normal B 0 - 100 26 Adjust Blue value of Normal Colour Temperature.

Cool R 0 - 100 50 Adjust Red value of Cool Colour Temperature.

Cool G 0 - 100 34 Adjust Green value of Cool Colour Temperature.

Cool B 0 - 100 38 Adjust Blue value of Cool Colour Temperature.

Warml R 0 - 100 39 Adjust Red value of Warm Colour Temperature.

Warm G 0 - 100 24 Adjust Green value of Warm Colour Temperature.

Warm B 0 - 100 0 Adjust Blue value of Warm Colour Temperature.

Sharpness 0 - 100 65 Adjust the Sharpness value of Standard mode in HDMI(EXT-5 EXT-6 EXT7)

Colour 0 - 100 60 Adjust the Colour value of Standard mode in HDMI(EXT-5 EXT-6 EXT7)

Farbton 0 - 100 0 Adjust the Farbton value of Standard mode in HDMI(EXT-5 EXT-6 EXT7)

Brightness 0 - 100 49 Adjust the Brightness value of Bright mode in HDMI(EXT-5 EXT-6 EXT7)

Contrast 0 - 100 77 Adjust the Contrast value of Bright mode in HDMI(EXT-5 EXT-6 EXT7)

Sharpness 0 - 100 65 Adjust the Sharpness value of Bright mode in HDMI(EXT-5 EXT-6 EXT7)

Colour 0 - 100 60 Adjust the Colour value of Bright mode in HDMI(EXT-5 EXT-6 EXT7)

Farbton 0 - 100 0 Adjust the Farbton value of Bright mode in HDMI(EXT-5 EXT-6 EXT7)

Brightness 0 - 100 51 Adjust the Brightness value of Game mode in HDMI(EXT-5 EXT-6 EXT7)

Contrast 0 - 100 61 Adjust the Contrast value of Game mode in HDMI(EXT-5 EXT-6 EXT7)

Sharpness 0 - 100 65 Adjust the Sharpness value of Game mode in HDMI(EXT-5 EXT-6 EXT7)

Colour 0 - 100 60 Adjust the Colour value of Game mode in HDMI(EXT-5 EXT-6 EXT7)

Farbton 0 - 100 0 Adjust the Farbton value of Game mode in HDMI(EXT-5 EXT-6 EXT7)

Brightness 0 - 100 50 Adjust the Brightness value of Soft mode in HDMI(EXT-5 EXT-6 EXT7)

Contrast 0 - 100 61 Adjust the Contrast value of Soft mode in HDMI(EXT-5 EXT-6 EXT7)

Sharpness 0 - 100 65 Adjust the Sharpness value of Soft mode in HDMI(EXT-5 EXT-6 EXT7)

Colour 0 - 100 60 Adjust the Colour value of Soft mode in HDMI(EXT-5 EXT-6 EXT7)

Farbton 0 - 100 0 Adjust the Farbton value of Soft mode in HDMI(EXT-5 EXT-6 EXT7)

Variable

range

Default

Value

--- --- Initialize Nvram data from ROM. (When push green key it will start the initializing. When push back key it will returns to previous.)

(When push right arrown key it will start the initializing. When push back key it will returns to previous.)

Comment

(No.YA608<Rev.002>)1-17

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT

Item

WHITE BALANCE

Measuring

instrument

Remote control unit

Signal generator

[WHITE BALANCE SETTING]

Setting Item Initial setting value

Normal R

Normal G

Normal B

Test point Adjustment part Description

[White Balance] Normal R Normal G Normal B

(1) Set COLOUR TEMP. to "Normal". (2) Select "White Balance" from the FACTORY

MODE. (3) Receive a PAL 75% all white signal. (4) Set the setting values of <Normal R>,

<Normal G> and <Normal B> to the values in

the left table. (5) Adjust the setting values of <Normal R> and

<Normal R> so that the screen becomes

maximum white.

NOTE:

When the normal mode is adjusted, other modes (cool/ warm) are automatically adjusted.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

Victor Company of Japan, Limited

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

(No.YA608<Rev.002>)

Printed in Japan

VPT

SCHEMATIC DIAGRAMS

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

LT-42DA9BJ, LT-42DA9BU

DVD-ROM No.SML2008Q2

No.YA608<Rev.001>

2008/7

LT-42DA9BJ, LT-42DA9BU

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

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.

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

(4)Oscilloscope sweeping time

(5)Voltage values

Since the voltage values of signal circuit vary to some extent according to adjustments, use them as reference values.

: Original setting position when shipped

: DC 20kΩ/V

: H

: V

: Othters

: All DC voltage values

20µs / div

5ms / div

Sweeping time is specified

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board

: R1209

R209

Type No indication

MM PP

MPP

MF TF BP TAN

(3)Coils

No unit

Others

(4)Power Supply

Respective voltage values are indicated

(5)Test point

: Test point

(6)Connecting method

: Ceramic capacitor : Metalized mylar capacitor

: Polypropylene capacitor : Metalized polypropylene capacitor : Metalized film capacitor : Thin film capacitor : Bipolar electrolytic capacitor : Tantalum capacitor

: [µH]

: As specified

: B1

: 9V

: Connector

: Receptacle

: Only test point display

: Wrapping or soldering

: B2 (12V

: 5V

)

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit : [Ω]

K M

Rated allowable power No indication : 1/16 [W]

Others : As specified

Type

No indication

OMR

MFR

MPR

UNFR

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

(2)Capacitors

Capacitance value

1 or higher : [pF]

less than 1

Withstand voltage

No indication : DC50[V]

Others : DC withstand voltage [V]

AC indicated Electrolytic Capacitors

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

: [kΩ]

: [MΩ]

: Carbon resistor

: Oxide metal film resistor

: Metal film resistor

: Metal plate resistor

: Uninflammable resistor

: Fusible resistor

: [µF]

: AC withstand voltage [V]

(7)Ground symbol

: LIVE side ground

: ISOLATED(NEUTRAL) side ground

: EARTH ground

: DIGITAL ground

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.

)

(No.YA608<Rev.001>)2-1

CONTENTS

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

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

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

CIRCUIT DIAGRAMS ...................................................................................2-7

MAIN PWB CIRCUIT DIAGRAM ................................................................................................................. 2-7

MPEG PWB CIRCUIT DIAGRAM ............................................................................................................. 2-51

IR PWB CIRCUIT DIAGRAM .................................................................................................................... 2-87

KEY PWB CIRCUIT DIAGRAM................................................................................................................. 2-89

LED PWB CIRCUIT DIAGRAM................................................................................................................. 2-91

PATTERN DIAGRAMS .............................................................................. 2-93

MAIN PWB P ATTERN .............................................................................................................................. 2-93

MPEG PWB P ATTERN............................................................................................................................. 2-97

IR PWB P ATTERN.................................................................................................................................. 2-101

KEY PWB P ATTERN .............................................................................................................................. 2-101

LED PWB P ATTERN .............................................................................................................................. 2-102

USING P.W. BOARD

P.W.B ASS㵭Y name LT-42DA9BJ

MAIN P.W. BOARD

MPEG P.W. BOARD

IR P.W. BOARD

KEY P.W. BOARD

LED P.W. BOARD

HU-71200010

HU-71200005

HU-72200004

HU-72200003

HU-72200017 φ

LT-42DA9BU

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP TR

E C B

ECB

BOTTOM VIEW FRONT VIEW TOP VIEW

OUT

IN OUTE

(G)E(S)C(D)

1 N

ECB

1 N

CHIP IC

2-2(No.YA608<Rev.001>)

TOP VIEW

2-4(No.YA608<Rev.001>)(No.YA608<Rev.001>)2-3

TOP

FRONT

TOP

MAIN PWB

LED PWB

POWER UNIT

IR PWB

KEY PWB

LCD PANEL UNIT

[INVERTER PWB(MASTER)]

LCD PANEL UNIT

[INVERTER PWB(SLAVE)]

LCD PANEL UNIT

[LCD CONTROL PWB]

JP680

CN003-2

CN002

JP681

JP682

JP581

JP1

JP2

JP683

JP3

CN003-1

CN001

JP630

JP710

AC INLET

250V/6.3A

ANALOG TUNER

SPEAKER(R)SPEAKER(L)

JP900

MPEG PWB

DIGITAL TUNER

WIRING DIAGRAM

(No.YA608<Rev.001>)2-5 2-6(No.YA608<Rev.001>)

SCL/SDA

VIN11/12/13

VIN2

MPEG_R_Pr/G_Y/B_Pb

MPEG_CVBS

161Pin

181,180,

179Pin

190Pin

COM_RXD/TXD

P2.4/TDI

P2.5/TMS

91/92Pin

83/84Pin

208Pin

105Pin

P3.3

ROM_WP

COM_RXD/TXD

HDMI RECEIVER

U470

SCALER

OSDFW

SDPIF_OUT

TXD_PC/RXD_PC

RS232C DRIVER

U660

SERVICE PORT

DIGITAL AUDIO

EXT-5

EXT-6

EXT-7

EXT-3

EXT-4

EXT-1

EXT-2

L/S

X-TAL

14.318 MHz

U661

RS232_SW

HDMI1_PWR(HDMI1_DET)

HPD1

CEC_A

D1SDA/D1SCL

TMDS1

EEPROM

HDMI

HDMI3_PWR(HDMI3_DET)

HPD3

CEC_A

D3SDA/D3SCL

EEPROM

TA1/RA1_Sub MICOM

TA2/RA2TA1/RA1

DIGITAL VIDEO INPUT PORT

50 ~ 73 Pin

P3.2 P3.4

P2.1

P2.0

P4.1

HDMI3_DET

HDMI2_DET

HDMI1_DET

2Pin

100Pin

109Pin

160Pin

159Pin

1Pin

HPD1

HPD2

HPD3

CTP_SCL/SDA_3V3

HDMI_INT

HSYNC/VSYNC

IN0DE

IN0CLK

11/12Pin

187/184/182Pin

AIN3R/L

MPEG_GPIO

MUX_AUD_R/L

SELECTION1

CVBS_TIN

HDMI2_PWR(HDMI2_DET)

HPD2

CEC_A

D2SDA/D2SCL

TMDS2

COM_Pr/Y/Pb (MUX_RO/GO/BO)

COMP_RI/LI

AL/AR_CVBS

SCART1_ID

SCART1_R/G/B/CVBS

SCART1_FB

SCART1_RI/LI

SCART1_RO/LO

SCART1_CVBSO

SCART2_ID

SCART2_R/G/B/CVBS

SCART2_FB

SCART2_RI/LI

SCART2_RO/LO

SCART2_CVBSO

Analog Tuner

ANT_SIF

VCTP_SCL/SDA_3V3

(AT_SCL/SDA)

+5V_ANT

CVBS_TIN

+7V

ANT_PWR_EN

VCTP_SCL/SDA_3V3

SCART2_CVBSO

SCART1_CVBSO

U200

SWITCH

U580

U120

(OP AMP)

MPEG PWB

MICOM

U801

U800

Y800

VOLTAGE

DET

LED&KEY PWB

16MHz

X-TAL

IR_IN

KEY_ADC2

KEY_ADC1

LED_R

FRONT_LED_B

+5VSTRESETn

IR_SCART_TV

SBTV

MPEG_GPIO

DTT_RESETDTT_AUD_R/L

MPEG_B_Pb

MPEG_G_Y

MPEG_R_Pr

MPEG_CVBS

MPEG_RXD/TXD

SPDIF_OUT

COMU_RX/TX

SCL/SDA_STB

TA1/RA1_Sub MICOM

MSP_ENABLE

IR_SCART_TV

VCTP_INT

VCTP_Fail

R,C filter

98Pin

OSDR/

P3.0

OSDFW

SECAM-L

106Pin

102Pin

88Pin

87Pin

117Pin

RS232_SW

DEBUG

POWER UNIT

BLT_EN

BRT_ADJ

+12V

+7V

+5V

+5VST

STBY_EN

+24V

L/S

VCTP_SCL/SDA_3V3

110Pin

EEPROM

COMU_RX/TX

MPEG_RXD/TXD

TMDS3

CEC_A

HDMI_RESET

RGB(24Bits)

VCTP_SCL/SDA_3V3

115,116Pin

SCART_R/G/B/CVBS

SCART_FB

SCART_RI/LI

SCART1_RO/LO

SCART1_CVBS_OUT

SCART2_CVBS_OUT

SCART2_RO/LO

VSUP5.0SIF, VSUP8.0AU

/RESET

MCP100T

VSUP3.3COM

+5V+8V ,

MSP_ENABLE U630

U770

AUDIO DAC+OP

AMP

U560

HDMI_I2S HDMI_AUD_R/L

VIN6/7/9

13,14Pin

101Pin

P3.5

VOUT2

VOUT1

AOUT1R/L

AIN1R/L

VIN18

VIN15/16/17/3

SIFIN+

VIN1

P4.4

AOUT2R/L

RESETQ

8Pin

21/22Pin

194Pin

195Pin

23/24Pin

9/10Pin

175Pin

178/177/176/189Pin

31Pin

191Pin

3Pin

ANT_SIF

Debeg

JTAG

20.25MHz

X-TAL

Y60

XTAL

P4.0

SPEAKERR

SPEAKERL

HEADPHONEL/R

AIN4L/R

VIN21

VIN19/20

P3.6

HEADPHONE_ID

SV_C/Y

CVBS

HPO_L/R

AMP_R+

AMP_L-

AMP_L+

AC_DETECT

(AUDIO AMP)

U580

OP AMP

25/26Pin

HP_L/R

27Pin

R_SPK

L_SPK

MUTE_CTRL

28Pin

118Pin

P2.2

VIN22/DVS

DEN

DCLK

AIN2R/L

171,47Pin

48Pin

49Pin

89Pin

Analog MUX

AC_DETECT

+12V or +5V

POWER

LCD

PANEL

UNIT

SPEAKER(R)

SPEAKER(L)

LVDS_OUT

AL/AR_CVBS

AMP_R-

DTT_AUD_R/L

15,16Pin

172Pin

173/174Pin

99Pin

ANT_PWR_CTRL

167Pin

SBTV

DTT_RESET

P1.1

P1.4

P1.5

P1.2

P2.3

P4.3

P4.2

VCTP_Fail

ANT_PWR_EN

162Pin

90Pin

119Pin

120Pin

166Pin

VCTP_INT

PANEL_PWR

BRT_ADJ

BLT_EN

P3.1

P3.7

P4.5

P1.6

P1.7

P4.6

P4.7

P2.7

P2.6

REG

U771

YPbLRPr

X-TAL

Y470

14.31818MHz

BLOCK DIAGRAM

2-8(No.YA608<Rev.001>)(No.YA608<Rev.001>)2-7

MAIN PWB ASS'Y (1/22) [Analog Tuner]

HU-71200010

lt-32da9bj_scaler-20_0602_20/23_0.0

D D

C C

B B

A A

L/T outpur Phono type

Input - IEC type

I2C AS : 0xC0

All location are from 770 to 799

LOW

ONHIGH

+5V_ANT

OFF

ANT_PWR_EN

IF ANT_PWR_CTRL is L --> ANT_PWR_EN L

+7V

12345678910111213141516171819

BB(CTR)

ANT (5V)

+B(+5V)NCRF_AGC

TP_+33VNCGND

SDA

SCLASNC

CVBS

AFT

AUDIO

SIFNCNCNCNC

12345

/INH

VIN

GND

VOUT

ADJ

GND

1 2

ANT_SIF

CVBS_TIN

750/F/1005

R780

R776

R777

330/1005

2.2uF/50V/MVK/S

C780

+5V_ANT_A

000/1005R779

R770 000/1005

GND1 GND2 GND3 GND4

TAUT-S711D

U770

+5V_ANT

AGC

C771

OPEN_2.2uF/50V/MVK/S

Q773 KST4401

101/1005

R784

SECAM-L

152/1005

R785

+5V_Analog_Tuner

472/1005

R773

AGC

470uF/16V/MVK/S

C772

+5V_Analog_Tuner

C770

104p/1005

330p

C781 C782

330p OPEN-330p

C783 C784

OPEN-330p

OPEN-000/1005

000/1005

OPEN-000/1005R790

R791

R792

R793

VCTP_SDA_3V3

VCTP_SCL_3V3

+5.29V

+5V_ANT_A

MAX 1.5A

LD29150PT/P-PAK 5P

U771

ANT_PWR_EN

ANT_PWR_CTRL

R781

103/1005

+3V3D

U772 MIC2544-1YMMPOWER SW

OPEN_103/1005

R778

GND

FLG

EN OUT

OUT

ILIM

152/1005

R789

104p/1005

C774

106p/2012

C777 C778

104p/1005

+5V_ANT

106p/2012

C773 OPEN-ZMMC5V6

D770C776

104p

C775 106p/2012

101p/1005

C779

R786 333/F/1005

R787 103/F/1005

MAIN PWB

(3/22)

MAIN PWB(3/22)

MAIN PWB(4/22)

MAIN PWB(3/22),(6/22),(13/22),(21/22)

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM (1/22) [Analog Tuner]

(No.YA608<Rev.001>)2-9 2-10(No.YA608<Rev.001>)

MAIN PWB ASS'Y (2/22) [VCTP Power]

HU-71200010

lt-32da9bj_scaler-01_0602_1/23_0.0

D D

C C

B B

A A

VCT-P POWER

All location are from 1 to 59.

MSP_ENABLE H ON

L OFF

Sequence : STBY_EN --> +3V3_VCTP --> MSP_ENABLE

197

192

185

169

170

164

127

142

124

1149686777545363318

196

163

153

147

144

136

130

123

113958576744635342019186

143

209

133

139

150

156

VSUP3.3IO3

VSUP3.3VO

VSUP1.8FE

VSUP3.3FE

VSUP3.3DAC

VSUP3.3LVDS

VSUP1.8LVDS

VSUP1.8DIG

VSUP3.3IO1

VSUP3.3FL

VSUP3.3COM

VSUP3.3DRI

VSUP3.3RAM

VSUP3.3DIG

VSUP5.0SIF

VSUP8.0AU

VREFAU

GND3.3IO3

GND3.3DAC

GND3.3LVDS

GND1.8DIG

GND3.3IO1

GND3.3FL

GND3.3COM

GND3.3DRI

GND3.3RAM

GND3.3DIG

GNDA

SGND

GNDA

REXT

IC_GND

123

678

S1G1S2

G2 D2

D2D1D1

106p/2012

C42C43

104p/1005

VSUP8.0AU_A

VSUP5.0SIF

VSUP3.3DIG

VSUP3.3RAM

VSUP3.3DRI

622/F/1005

VCT7993P-FA-A1-H-500

U1D

102p/1005

C31

104p/1005

C33

104p/1005

C34

104p/1005

C32C30

102p/1005

C29

106p/2012

L11

BLM18PG300SN1D

+3V3_VCTP

C28 106p/2012

C27

104p/1005

VSUP3.3DAC

VSUP3.3FE

VSUP1.8FE

VSUP3.3VO

VSUP3.3IO3

VSUP3.3LVDS

VSUP1.8LVDS

VSUP1.8DIG

VSUP3.3IO1

VSUP3.3FL

VSUP3.3COM

+3V3_VCTP

BLM18PG300SN1D

C21

106p/2012

+3V3_VCTP VSUP3.3DIG

C4 104p/1005

106p/2012

VSUP3.3FL

C14 104p/1005

C13

106p/2012

104p/1005

C22

BLM18PG300SN1D

VSUP3.3LVDS

BLM18PG300SN1D

VSUP3.3COM

+3V3_VCTP

BLM18PG300SN1D

VSUP3.3IO1

104p/1005104p/1005

C6C5

106p/2012

VSUP3.3DRI

C16

104p/1005106p/2012

C15

BLM18PG300SN1D

+3V3_VCTP

BLM18PG300SN1D

VSUP3.3RAM

C24 104p/1005

C23

106p/2012

+1V8_VCTP

L12

VSUP1.8LVDS

VSUP5.0SIF

106p/2012

C35

104p/1005

C36

BLM18PG300SN1D

+5V

L16 BLM31PG121SN1L

VSUP8.0AU_A

SI4925DY

106p/2012

C37 C38

104p/1005

+3V3_VCTP

L13

BLM18PG300SN1D

VSUP3.3DAC

104p/1005

C26C25

106p/2012

BLM18PG300SN1D

L10

+3V3_VCTP

BLM18PG300SN1D

VSUP3.3FE

104p/1005

106p/2012

VSUP3.3VO

BLM18PG300SN1D

+3V3_VCTP

C17

106p/2012 104p/1005

C18

VSUP3.3IO3

+12V

VSUP8.0AU 471/1005 471/1005 471/1005 471/1005R4

ZMM5237B

C11

104p/1005

C12

101p/1005

C10 106p/3216

+1V8_VCTP_A VSUP1.8DIG

C20

104p/1005

C19

106p/2012

VSUP1.8FE

C41

104p/1005

C40

104p/1005

C39

106p/2012

HH-1M3216-501JT

L14

+1V8_VCTP

MSP_ENABLE

104/1005

BLM31PG121SN1L

L15

VSUP8.0AU

Q1 KST4401

R7 472/1005

C46 106p/3216

C47

106p/3216

C44 C45

104p

MAIN PWB(21/22)

MAIN PWB CIRCUIT DIAGRAM (2/22) [VCTP Power]

+ 58 hidden pages

JVC LT-42DA9BN, LT-42DA9BU, LT-42DA9BJ Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual