JVC LT-42DP8 BG-BJ, LT-42D80BU Schematic

SERVICE MANUAL

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

YA54520078SERVICE MANUAL

LT-42DP8BG/P, LT-42DP8BJ LT-42P80BU

/P,

BASIC CHASSIS

FL5

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

No.YA545

2007/8

SPECIFICATION

Items

Dimensions ( W × H × D ) 103.0 cm × 71.9 cm × 29.6 cm [Included stand]

Mass 28.5 kg [Included stand]

Power Input AC220V - AC240 V, 50 Hz

Power Consumption 220 W (Standby: 0.5 W) 214 W (Standby: 0.5 W)

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

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

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

Receiving Frequency

Intermediate Frequency

Colour Sub Carrier Frequency

Teletext System Analog FLOF (Fastext level 2.5) /

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

Screen Size Diagonal: 105 cm (H: 93.0 cm × V: 52.3 cm) Display Pixels Horizontal: 1366 dots × Vertical: 768 dots (W-XGA)

Audio Power Output 10 W + 10 W

Speaker 5.5 cm × 20.0 cm, oval type × 2 (Oblique Cone) Aerial terminal (VHF/UHF) 75 Ω unbalanced, coaxial EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) × 2 EXT-3 (Input) S-Video Mini-DIN 4 pin × 1

EXT-4 (Input) Component Video

625p / 525p / 625i / 525i

Digital input [DIGITAL-IN 1/2]

PC (RGB) Input D-sub 3-row 15pin × 1

Audio Output 500 mV (rms), Low impedance, RCA pin jack × 2 Digital Audio Optical Output Digital SPDIF × 1--Headphone 3.5 mm stereo mini jack × 1 Remote Control Unit RM-C1911 (AA/R6 dry cell battery × 2)

SECAM --- 4.40625MHz / 4.25MHz

750p / 1125i

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

103.0 cm × 67.2 cm × 12.2 cm [TV only]

26.4 kg [TV only]

Digital DVB-T ---

Analog UHF: 470 MHz - 862 MHz VHF: 47MHz - 470MHz

Digital UHF:470 MHz - 854 MHz UHF:174 MHz - 230 MHz

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

SIF 32.9MHz (6.0MHz:I) 33.4MHz (5.5MHz:B/G)

PAL 4.43MHz

NTSC 3.58MHz / 4.43MHz

WST(World Standard system)

Digital MHEG 5 UK profile EBU TEXT ---

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

C: 0.286 V (p-p) (Burst signal), 75 Ω Video 1 V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack × 1 Audio 500 mV (rms), High impedance, RCA pin jack × 2

RCA pin jack × 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

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

R/G/B : 0.7V (p-p), 75Ω

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

< Available signal >

VGA : 640 pixels × 480 pixels (Horizontal : 31.5kHz / Vertical : 60Hz)

XGA : 1024 pixels × 768 pixels (Horizontal : 48.4kHz / Vertical : 60Hz)

LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/P

UHF: 470 MHz - 862 MHz CATV: 116MHz - 172MHz / 220MHz - 469MHz

UHF:470 MHz - 862 MHz

32.9MHz (6.0MHz:I)

32.4MHz (6.5MHz:D/K)

FLOF (Fastext level 2.5) / TOP / WST(World Standard system)

Contents

28.0 kg [Included stand]

25.9 kg [TV only]

---

RM-C1910 (AA/R6 dry cell battery × 2)

Design & specifications are subject to change without notice.

1-2 (No.YA545)

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

0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA 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 METAL PART

(No.YA545)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.

1-4 (No.YA545)

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.

1.3.3 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.

Ventilation hole

*Diagram differs from actual appearance.

1.3.2 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

TV STAND

*Diagram differs from actual appearance.

1.3.4 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.

1.4 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.

(No.YA545)1-5

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

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 0 RESET : OK 1

(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.

1.4.3 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).

1.4.4 HOW TO CHECK THE OPERATING TIME

This model has a function to count and record the LCD panel operating time. The operating time can be checked in the following procedure.

• Maximum count time = 131070 hours (1) Press the [INFORMATION] key and [MUTING] key simul-

taneously, then enter the SERVICE MODE.

(2) When the Main Menu is displayed, press [2] key to enter

the self check mode.

(3) The operating time of the LCD panel is displayed in 5-digit

decimal number.(Refer to the below figure)

SERVICE MODE SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

Press [2] key

Switch the display/ non-display with the [ZOOM] key.

SELF CHECK MODE SCREEN (Page 1)

The operating time is displayed

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 0 RESET : OK 1

MAX is displayed when the maximum count time is exceeded

*When the power is turned off with the remote control unit or the power

button of the main unit, the count restarts from the turn off time.

*When the power is turned off by disconnecting the power cord from the

AC outlet, the recorded time count less than 2 hours is not counted.

*When the operating time exceeds the maximum count time, "MAX" is

displayed to the right of the counted time, and the following count is discontinued.

1.4.5 HOW TO RESET THE OPERATING TIME

(1) Press the [MENU] key simultaneously, then enter the

USER MENU. (2) Select the "Features" from the USER MENU. (3) Select the Blue back from the Features. (4) Set the Blue back to Off. (5) Press the [INFORMATION] key and [MUTING] key

simultaneously, then enter the SERVICE MODE. (6) When the Main Menu is displayed, press [2] key to enter

the self check mode. (7) When the self check screen(page-1) is displayed, press

[ZOOM] key. (8) "RESET : OK" is displayed under the operating time. (9) Press the [TV] key to reset the operating time.

NOTE:

When the LCD PANEL UNIT is replaced, be sure to reset the operating time following the above method.

1-6 (No.YA545)

2.1 SYSTEM SETTING

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 0 RESET : OK 1

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

Be sure to carry out the following operation at the end of the procedure.

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

simultaneously, then enter the SERVICE MODE.

(2) When the Main Menu is displayed, press [2] key to enter

the self check mode.

(3) Turn off the power by pressing the [POWER] key on the

remote control unit.

SERVICE MODE SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

Press [2] key

SELF CHECK MODE SCREEN (Page 1)

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 0 RESET : OK 1

2.2 FEATURES

100Hz Clear Motion Drive

This function is able to display twice as many frames as a conventional LCD display.

DIGITAL TUNER [LT-42DP8 series only]

This TV can receive both DVB-T (Digital terrestrial broadcasting) and Analogue terrestrial broadcasting.

D.I.S.T. (Digital Image Scaling Technology)

This system uses line interpolation to double the number of scanning lines and achieve high resolution, flicker-free picture.

Colour Management

This function ensures dull colours are compensated to produce natural hues.

Picture Management

Smart Picture

This function detects the APL (Average Picture Level) and adjusts the contrast suitable for what you are watching.

DIGITAL VNR

This function cuts down the amount of noise in the original picture.

MPEG Noise Reduction

This function effects the block noise removal and mosquito NR simultaneously.

MaxxAudio

MaxxAudio improves sound performance with four sound features (MaxxBass, MaxxTreble, MaxxStereo and MaxxVolume).

This function makes it easier to see the dark areas when a picture has many dark areas, and makes it easier to see the bright areas when a picture has many bright areas.

2.3 MAIN DIFFERENCE LIST

Item LT-42DP8BJ/P LT-42DP8BG/P LT-42P80BU/P

Digital Tuner YES ← NO

Teletext (Digital) MHEG 5 UK profile EBU TEXT NO

Indoor ANT Power Supply YES ← NO Digital Audio Optical Output YES ← NO Remote Control Unit RM-C1911 ← RM-C1910

(No.YA545)1-7

2.4 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2

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)

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

, 75Ω Used Used

(B-W)

Used Used

9 GND (G) Used Used

10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)

11 G input 700mV

, 75Ω Used Used

(B-W)

12 SDA Not used Used (SDA2)

13 GND (R) Used Used

14 GND (YS) Used Not used

15 R / C input R : 700mV

C : 300mV

(B-W) (P-P)

, 75Ω

Used (C1/R) Used (C2/R)

16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75Ω Used Used

17 GND (VIDEO output) Used Used

18 GND (VIDEO input) Used Used

19 VIDEO output 1V

20 VIDEO / Y input 1V

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

(P-P)

(Negative sync), 75Ω Used (Y1/V) Used (Y2/V)

(P-P)

21 COMMON GND Used Used

(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

1-8 (No.YA545)

2.5 TECHNICAL INFORMATION

2.5.1 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.

2.5.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications

Maximum dimensions ( W × H × D ) 98.3 cm × 57.6 cm × 5.2 cm

Weight 15.0 kg

Effective screen size Diagonal: 1050 mm (H: 930.25 mm × V: 523.01 mm)

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: 0.681 mm, Vertically: 0.681 mm

Displayed colour 16777216 colours 256 colours for R G and B

Brightness 500cd/m

Contrast ratio 1500 : 1

Response time (Tr) less than 8 ms

View angle (Horizontally) 178° View angle (Vertically) 178°

Surface polarizer Anti-Glare type Low reflective coat

Colour 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)

2.5.1.2 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.YA545)1-9

2.5.2 MAIN CPU PIN FUNCTION [IC7301

Pin Pin name I/O Function Pin Pin name I/O Function

1 TCK O Test purpose 65 D2 I/O Program ROM data for main CPU 2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU 3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU 4 TDO O Test purpose 68 VSS33 - GND 5 P2.8 I Input for HDMI CEC 69 VDD33 I 3.3V 6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU 7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU 8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU

9 P2.12 O Blue for OSD 73 RSTIN I Reset 10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Release : L] 11 P2.14 I TV-LINK data 75 P3.1 O Reset for digital tuner unit 12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control 13 VSS33 - GND 77 P3.3 I Clock for OSD 14 VDD33 I 3.3V 78 P3.4 O Red for OSD 15 P4.5 O TV-LINK data 79 P3.5 O Red for OSD 16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD 17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD 18 A18 O Program ROM address for main CPU 82 MTST I/O Data transmission for chassis CPU communication 19 A17 O Program ROM address for main CPU 83 MTSR I/O Data receive for chassis CPU communication 20 VSS25 - GND 84 VSS33 - GND 21 VDD25 I 2.5V 85 VDD33 I 3.3V 22 A16 O Program ROM address for main CPU 86 VSS25 - GND 23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V 24 A7 O Program ROM address for main CPU 88 TXD0 I/O Data transmission for digital tuner unit 25 A9 O Program ROM address for main CPU 89 RXD0 I/O Data receive for digital tuner unit 26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD 27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication 28 A10 O Program ROM address for main CPU 92 P3.15 O Output for HDMI CEC 29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD 30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD 31 VSS33 - GND 95 TRIG_IN O Green for OSD 32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD 33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD 34 A3 O Program ROM address for main CPU 98 P6.3 I/O I 35 A2 O Program ROM address for main CPU 99 P6.4 I/O I 36 A1 O Program ROM address for main CPU 100 P6.5 O Sync signal select for OSD / Teletext 37 A0 O Program ROM address for main CPU 101 IRQ O Interrupt request for digital tuner unit 38 A13 O Program ROM address for main CPU 102 VSYNC I Vertical sync 39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I Horizontal sync 40 CAS/A15 O Program ROM address for main CPU 104 41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext 42 VDD33 I 3.3V 106 VDD33 I 3.3V 43 MEMCLK O Clock for memory 107 VSS33 - GND 44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock 45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock 46 CSROM O Chip select for memory 110 VSSA - GND 47 RD O Read for memory 111 VDDA I 2.5V 48 UDQM O Control buffer of memory 112 R O R for Teletext 49 LDQM O Control buffer of memory 113 G O G for Teletext 50 WR O Write for memory 114 B O B for Teletext 51 D15 I/O Program ROM data for main CPU 115 VSSA - GND 52 VSS33 - GND 116 VDDA I 2.5V 53 VDD33 I 3.3V 117 CVBS2 I Not used 54 D7 I/O Program ROM data for main CPU 118 VSSA - GND 55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V 56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Not used 57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext 58 D6 I/O Program ROM data for main CPU 122 VSSA - GND 59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V 60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H] 61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H] 62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L] 63 D9 I/O Program ROM data for main CPU 127 64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose

: DIGITAL PWB]

COR/RSTOUT

(KEYP2)P5.3

C bus clock (for main memory)

C bus Data (for main memory)

O Not used

I Error detection for digital tuner unit

1-10 (No.YA545)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

• Be sure to perform the SYSTEM SETTING, at the end of the procedure.

• 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.

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.

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

(1) Remove the 1 screw [A]. (2) Remove the POWER CORD COVER. (3) Remove the POWER CORD. (4) Remove the 10 screws [B], 4 screws [C], 5 screws [D], 2

screws [E] and 1 screw [F].

(5) Remove the REAR COVER.

3.1.2 REMOVING THE ANALOG PWB (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 1 screw [G]. (2) Remove the TUNER BASE. (3) Remove the 3 hooks [a], 2 screws [H] and 3 screws [I]. (4) Remove the TERMINAL BASE. (5) Remove the 5 screws [J] and 2 screws [K]. (6) Remove the ANALOG PWB.

3.1.3 REMOVING THE DC-DC PWB (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 2 screws [L]. (2) Remove the DC-DC PWB.

3.1.4 REMOVING THE POWER PWB (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 11 screws [M]. (2) Remove the POWER PWB.

3.1.5 REMOVING THE SW PWB (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 2 screws [N]. (2) Remove the CONTROL KNOB with SW PWB. (3) Remove the 2 screws [O]. (4) Remove the SW PWB from the CONTROL KNOB.

3.1.6 REMOVING THE DIGITAL TUNER UNIT

[LT-42DP8 series only] (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 9 hooks [b]. (2) Remove the SHIELD COVER. (3) Remove the 2 screws [P], 2 screws [Q] and 2 screws [R]. (4) Remove the SHIELD TERMINAL. (5) Remove the 4 screws [S]. (6) Remove the DIGITAL TUNER UNIT.

3.1.7 REMOVING THE DIGITAL PWB (Fig.3-1)

• Remove the REAR COVER.

• Remove the SHIELD COVER.

• Remove the SHIELD TERMINAL.

• Remove the DIGITAL TUNER UNIT. [LT-42DP8 series only] (1) Remove the 7 screws [T]. (2) Remove the DIGITAL PWB BRACKET.

[LT-42DP8 series only]

(3) Remove the 2 screws [U]. (4) Remove the DIGITAL PWB.

CAUTION :

Make sure to perform the "SYSTEM SETTING", when DIGITAL PWB is replaced.

3.1.8 REMOVING THE SPEAKER (Fig.3-1)

• Remove the REAR COVER. (1) Remove the 2 screws [V]. (2) Remove the SPEKAER. (3) Follow the same steps when removing the other hand

SPEAKER.

3.1.9 REMOVING THE STAND ASS'Y (Fig.3-1)

(1) Remove the 1 screw [F] and 4 screws [W]. (2) Remove the STAND ASS'Y.

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

• Remove the REAR COVER.

• Remove the STAND ASS'Y. (1) Remove the 5 screws [X] and 2 screws [Y]. (2) Remove the STAND BASE SUPPORT. (3) Remove the 2 screws [Z] and 2 hooks [c]. (4) Remove the LED PWB.

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

• Remove the REAR COVER.

• Remove the STAND ASS'Y.

• Remove the STAND BASE SUPPROT.

• Remove the SPEKAER. (1) Remove the 4 screws [AA], 4 screws [AB] and 4 screws

[AC]. (2) Remove the MAIN BASE. (3) Remove the LCD PANEL UNIT from the FRONT PANEL.

(No.YA545)1-11

POWER CORD COVER

POWER CORD

REAR COVER

ANALOG PWB

TERMINAL

BASE

DC-DC PWB

POWER PWB

SHIELD COVER

DIGITAL TUNER UNIT

DIGITAL PWB BRACKET

SHIELD TERMINAL

CONTROL

KNOB

MAIN BASE

SW PWB

LCD PANEL UNIT

LED PWB

TUNER BASE

DIGITAL PWB

STAND BASE

SUPPORT

STAND ASS'Y

SPEAKER

FRONT PANEL

1-12 (No.YA545)

SPEAKER

Fig.3-1

The illustration is LT-42DP8 series

3.1.12 REMOVING THE LCD CONTROL PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the STAND ASS'Y.

• Remove the STAND BASE SUPPROT.

• Remove the MIAN BASE. (1) Remove the 4 screws [A]. (2) Remove the LCD CONTROL PWB COVER. (3) Remove the LCD CONTROL PWB.

3.1.13 REMOVING THE INVERTER PWB (Fig.3-2)

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

INVERTER PWB.

LCD CONTROL PWB COVER

INVERTER PWB(MASTER)

COVER

INVERTER PWB(MASTER)

LCD CONTROL PWB

INVERTER PWB(SLAVE)

COVER

INVERTER PWB(SLAVE)

FRONT

Fig.3-2

(No.YA545)1-13

3.2 MEMORY IC REPLACEMENT

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

S001 R DRIVE 137 PAL50 FULL STD H

• 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.

3.2.1 MEMORY IC TABLE

Symbol Number of pins Mounting PWB Main content of data

IC7201

IC7602

48-pin DIGITAL PWB Program (Video process) of IC6001(System CPU) is memorized.

8-pin DIGITAL PWB Setting value of IC7301(MAIN CPU) is memorized.

3.2.2 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. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.3-3). Refer to the SERVICE ADJUSTMENT for setting.

3.2.3 SERVICE MODE SETTING

SERVICE MODE SCREEN

MAIN MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

ADJUSTMENT MODE SCREEN

S001 R DRIVE 137 PAL50 FULL STD H

Fig.3-3

SETTING ITEM

Setting items Settings Item No.

Video system setting Adjust S001 - S009

(Not used) Fixed T001 - T003

(Not used) Fixed M001 - M224

(Not used) Fixed F001 - F002

(Not used) Fixed D001

(Not used) Fixed Z001

3.2.4 SETTINGS OF FACTORY SHIPMENT

3.2.4.1 BUTTON OPERATION

Setting item Setting position

POWER Off

CHANNEL PR1

VOLUME 10

TV/AV TV

3.2.4.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

CHANNEL PR1

VOLUME 10

ZOOM Auto

SUB PICTURE EXT-1

SUB POWER Off

1-14 (No.YA545)

3.2.4.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE

Setting item Setting position

Picture Mode Bright

Colour Temp. Cool

Features

Super Digipure Auto

Movie Theatre Auto

Colour Management On

Picture Management On

Smart Picture On

MPEG Noise Reduction Off

Colour System Main Depends PR

Sub Auto

4:3 Auto Aspect Panoramic

(2) SOUND

Setting item Setting position

Stereo / I•ii Stereo Sound

MaxxAudio Low

Balance Centre

Voice Enhancer Off

(3) FEATURES

Setting item Setting position

Sleep Timer Off

Child Lock Off (ID:0000)

Appearance Type A

Blue Back On

Favorite Setting Blank

Illumination Bright

Power Lamp On

Eco Mode Off

(4) SET UP

Setting item Setting position

Auto Program Tv Channel Automatically Set

Edit/manual -

Language English

Decoder (Ext-2) Off

Component Auto Select Off

HDMI HDMI CEC: On

Size: Auto Audio: Auto

Attenuator Off

PC Position Centre

Auto Demonstration Off

Ext Setting

S-IN Blank

ID Blank

Dubbing Ext-1 → Ext-2

(5) DTV [LT-42DG8 series only]

[For UK]

Setting item Setting position

Configuration

Audio Language English

Subtitle Language English

Favourite Mode Off

Menu Lock Disable

[For other country]

Setting item Setting position

Configuration

Country --- *

Menu Language --- *

Audio Language --- *

Subtitle Language --- *

Teletext Language --- *

EPG Language --- *

Enter PIN Code 0000

Favourite Mode Off

Maturity Rating Off

*It differs according to the language that the user selected.

[For All country]

Setting item Setting position

Setup

Digital Audio Output PCM

Banner Duration 2sec

Receiver Upgrade Auto

Common Interface ---

Antenna Power Off

(No.YA545)1-15

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 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.

3.3.2 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.

3.3.3 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.

1-16 (No.YA545)

(4) Then solder leads B and C.

SECTION 4

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.

(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

Picture Adjustments Centre

Colour Temp. Normal

Super Digipure Auto

Movie Theatre Auto

Colour Management On

Picture Management On

Zoom Full

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator) [PAL]

• Remote control unit

4.5 BASIC OPERATION OF SERVICE MODE

4.5.1 HOW TO ENTER THE SERVICE MODE

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

remote control unit simultaneously to enter the SERVICE MODE SCREEN.

(2) In the SERVICE MENU, press the [1] key to display

ADJUSTMENT MODE SCREEN.

SERVICE MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

NOTE:

• Before enter the SERVICE MODE, press the [MODE] key to

confirm that "TV" position is indicated. If it is in a wrong position, the SERVICE MODE operation cannot be performed.

• When a number key other than the [1] key is pressed in the

SERVICE MODE SCREEN, the other relevant screen may be displayed. This is not used in the adjustment procedure. Press the

[MENU] key to return to the SERVICE MODE SCREEN.

4.5.2 HOW TO EXIT THE SERVICE MODE

Press the [MENU] key to exit the Service mode.

4.5.3 SERVICE MODE SELECT KEY LOCATION

[MUTING] key

[Nunber] key

4.4 ADJUSTMENT ITEMS

 VIDEO CIRCUIT

• WHITE BALANCE (HIGH LIGHT) adjustment

[INFORMATION] key

[Red] key

[MODE] key

[Function/] key

[Green] key

[MENU] key

[FUNCTION /] key

(No.YA545)1-17

4.5.4 ADJUSTMENT MODE

S001 R DRIVE 137 PAL50 FULL STD H

This mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT.

4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODE When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE.

4.5.5 DESCRIPTION OF STATUS DISPLAY

(3) PICTURE MODE

SOFT : SOFT

ADJUSTMENT MODE

SETTING ITEM No.

SETTING ITEM

SETTING VALUE (DATA)

STD : STANDARD BRI : BRIGHT

(4) COLOUR TEMP.

H: COOL M : NORMAL

S001 R DRIVE 137 PAL50 FULL STD H

L: WARM

(5) SETTING ITEM NAME

Setting item name are displayed. For the setting item names to be displayed, refer to "INITIAL SETTING VALUES IN THE SERVICE MODE".

SIGNAL SYSTEM

ZOOM MODE

PICTURE MODE

COLOUR TEMP.

(1) SIGNAL SYSTEM

The signal displayed on the screen is displayed.

PAL50 : PAL50Hz (Composite / S-video) PAL60 : PAL60Hz (Composite / S-video) SECAM : SECAM NTSC3 : NTSC3.58 NTSC4 : NTSC4.43 525I : 525i (Component) 525P : 525p 625I : 625i (Component) 625P : 625p 1125I5 : 1125i 50Hz 1125I6 : 1125i 60Hz RGB5 : RGB 525i RGB6 : RGB 625i PCVGA : PC (VGA) PCXGA : PC (XGA) D625I : DVB-T 625i H525I : HDMI 525i H525P : HDMI 525p H625I : HDMI 625i H625P : HDMI 625p H750P : HDMI 750p H125I5 : HDMI 1125i 50Hz H125I6 : HDMI 1125i 60Hz

--- : OTHER

(2) ZOOM MODE

State of the SCREEN SIZE or MULTI PICTURE is displayed.

SINGLE SCREEN

FULL : FULL PANO : PANORAMIC 1609 : 16:9 ZOOM 1609S : 16:9 ZOOM SUBTITLE 1409 : 14:9 ZOOM REGU : REGULAR

MULTI SCREEN

M2 : 2-pictures multi M12 : 12-pictures multi

(6) SETTING ITEM NO.

Setting item numbers are displayed. The setting item numbers to be displayed are listed below.

Item No. Setting item

S001 - S009 Video system setting

T001 - T003 (NOT USED)

M001 - M224 (NOT USED)

F001 - F002 (NOT USED)

D001 (NOT USED)

Z001 (NOT USED)

(7) SETTING VALUE (DATA)

The SETTING VALUE is displayed.

4.5.6 CHANGE AND MEMORY OF SETTING VALUE

SELECTION OF SETTING ITEM

• [FUNCTION /] key.

For scrolling up / down the setting items.

S001...S009 ↔ T001...T003 ↔ M001...M224 ↔ F001...F002 ↔ D001 ↔ Z001↔return to S001

CHANGE OF SETTING VALUE (DATA)

• [FUNCTION /] key.

For scrolling up / down the setting values.

MEMORY OF SETTING VALUE (DATA)

Changed setting value is memorized by pressing [MUTING] key.

1-18 (No.YA545)

4.6 INITIAL SETTING VALUES IN THE SERVICE MODE

• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.

• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". They are fixed values.

4.6.1 VIDEO SYSTEM SETTING

Item No. Item Variable range Setting value

S001 R DRIVE 0 - 255 137 S002 G DRIVE 0 - 255 137 S003 B DRIVE 0 - 255 137 S004 RESERV 0 - 255 --S005 2D YC 0 - 255 0 S006 RESERV 0 - 255 --S007 RESERV 0 - 255 --S008 RESERV 0 - 255 --S009 RESERV 0 - 255 ---

4.6.2 NOT USED ITEM (All values are Fixed values)

Item No. Item Variable range Setting value

T001 RESERV 0 - 15 ---

T002 RESERV 0 - 63 ---

T003 RESERV 0 - 63 ---

M001 1E00 00 - FF ---

M002 1E01 00 - FF ---

M003 1E02 00 - FF ---

M004 1E03 00 - FF ---

M005 1E04 00 - FF ---

M006 1E05 00 - FF ---

M007 1E06 00 - FF ---

M008 1E07 00 - FF ---

M009 1E08 00 - FF ---

M010 1E09 00 - FF ---

M011 1E0A 00 - FF ---

M012 1E0B 00 - FF ---

M013 1E0C 00 - FF ---

M014 1E0D 00 - FF ---

M015 1E0E 00 - FF ---

M016 1E0F 00 - FF ---

M017 1E10 00 - FF ---

M018 1E11 00 - FF ---

M019 1E12 00 - FF ---

M020 1E13 00 - FF ---

M021 1E14 00 - FF ---

M022 1E15 00 - FF ---

M023 1E16 00 - FF ---

M024 1E17 00 - FF ---

M025 1E18 00 - FF ---

M026 1E19 00 - FF ---

M027 1E1A 00 - FF ---

M028 1E1B 00 - FF ---

M029 1E1C 00 - FF ---

M030 1E1D 00 - FF ---

M031 1E1E 00 - FF ---

Item No. Item Variable range Setting value

M032 1E1F 00 - FF ---

M033 1E20 00 - FF ---

M034 1E21 00 - FF ---

M035 1E22 00 - FF ---

M036 1E23 00 - FF ---

M037 1E24 00 - FF ---

M038 1E25 00 - FF ---

M039 1E26 00 - FF ---

M040 1E27 00 - FF ---

M041 1E28 00 - FF ---

M042 1E29 00 - FF ---

M043 1E2A 00 - FF ---

M044 1E2B 00 - FF ---

M045 1E2C 00 - FF ---

M046 1E2D 00 - FF ---

M047 1E2E 00 - FF ---

M048 1E2F 00 - FF ---

M049 1E30 00 - FF ---

M050 1E31 00 - FF ---

M051 1E32 00 - FF ---

M052 1E33 00 - FF ---

M053 1E34 00 - FF ---

M054 1E35 00 - FF ---

M055 1E36 00 - FF ---

M056 1E37 00 - FF ---

M057 1E38 00 - FF ---

M058 1E39 00 - FF ---

M059 1E3A 00 - FF ---

M060 1E3B 00 - FF ---

M061 1E3C 00 - FF ---

M062 1E3D 00 - FF ---

M063 1E3E 00 - FF ---

M064 1E3F 00 - FF ---

M065 1E40 00 - FF ---

M066 1E41 00 - FF ---

M067 1E42 00 - FF ---

M068 1E43 00 - FF ---

M069 1E44 00 - FF ---

M070 1E45 00 - FF ---

M071 1E46 00 - FF ---

M072 1E47 00 - FF ---

M073 1E48 00 - FF ---

M074 1E49 00 - FF ---

M075 1E4A 00 - FF ---

M076 1E4B 00 - FF ---

(No.YA545)1-19

Item No. Item Variable range Setting value

M077 1E4C 00 - FF ---

M078 1E4D 00 - FF ---

M079 1E4E 00 - FF ---

M080 1E4F 00 - FF ---

M081 1E50 00 - FF ---

M082 1E51 00 - FF ---

M083 1E52 00 - FF ---

M084 1E53 00 - FF ---

M085 1E54 00 - FF ---

M086 1E55 00 - FF ---

M087 1E56 00 - FF ---

M088 1E57 00 - FF ---

M089 1E58 00 - FF ---

M090 1E59 00 - FF ---

M091 1E5A 00 - FF ---

M092 1E5B 00 - FF ---

M093 1E5C 00 - FF ---

M094 1E5D 00 - FF ---

M095 1E5E 00 - FF ---

M096 1E5F 00 - FF ---

M097 1E60 00 - FF ---

M098 1E61 00 - FF ---

M099 1E62 00 - FF ---

M100 1E63 00 - FF ---

M101 1E64 00 - FF ---

M102 1E65 00 - FF ---

M103 1E66 00 - FF ---

M104 1E67 00 - FF ---

M105 1E68 00 - FF ---

M106 1E69 00 - FF ---

M107 1E6A 00 - FF ---

M108 1E6B 00 - FF ---

M109 1E6C 00 - FF ---

M110 1E6D 00 - FF ---

M111 1E6E 00 - FF ---

M112 1E6F 00 - FF ---

M113 1E70 00 - FF ---

M114 1E71 00 - FF ---

M115 1E72 00 - FF ---

M116 1E73 00 - FF ---

M117 1E74 00 - FF ---

M118 1E75 00 - FF ---

M119 1E76 00 - FF ---

M120 1E77 00 - FF ---

M121 1E78 00 - FF ---

M122 1E79 00 - FF ---

M123 1E7A 00 - FF ---

M124 1E7B 00 - FF ---

M125 1E7C 00 - FF ---

M126 1E7D 00 - FF ---

Item No. Item Variable range Setting value

M127 1E7E 00 - FF ---

M128 1E7F 00 - FF ---

M129 1E80 00 - FF ---

M130 1E81 00 - FF ---

M131 1E82 00 - FF ---

M132 1E83 00 - FF ---

M133 1E84 00 - FF ---

M134 1E85 00 - FF ---

M135 1E86 00 - FF ---

M136 1E87 00 - FF ---

M137 1E88 00 - FF ---

M138 1E89 00 - FF ---

M139 1E8A 00 - FF ---

M140 1E8B 00 - FF ---

M141 1E8C 00 - FF ---

M142 1E8D 00 - FF ---

M143 1E8E 00 - FF ---

M144 1E8F 00 - FF ---

M145 1E90 00 - FF ---

M146 1E91 00 - FF ---

M147 1E92 00 - FF ---

M148 1E93 00 - FF ---

M149 1E94 00 - FF ---

M150 1E95 00 - FF ---

M151 1E96 00 - FF ---

M152 1E97 00 - FF ---

M153 1E98 00 - FF ---

M154 1E99 00 - FF ---

M155 1E9A 00 - FF ---

M156 1E9B 00 - FF ---

M157 1E9C 00 - FF ---

M158 1E9D 00 - FF ---

M159 1E9E 00 - FF ---

M160 1E9F 00 - FF ---

M161 1EA0 00 - FF ---

M162 1EA1 00 - FF ---

M163 1EA2 00 - FF ---

M164 1EA3 00 - FF ---

M165 1EA4 00 - FF ---

M166 1EA5 00 - FF ---

M167 1EA6 00 - FF ---

M168 1EA7 00 - FF ---

M169 1EA8 00 - FF ---

M170 1EA9 00 - FF ---

M171 1EAA 00 - FF ---

M172 1EAB 00 - FF ---

M173 1EAC 00 - FF ---

M174 1EAD 00 - FF ---

M175 1EAE 00 - FF ---

M176 1EAF 00 - FF ---

1-20 (No.YA545)

Item No. Item Variable range Setting value

M177 1EB0 00 - FF ---

M178 1EB1 00 - FF ---

M179 1EB2 00 - FF ---

M180 1EB3 00 - FF ---

M181 1EB4 00 - FF ---

M182 1EB5 00 - FF ---

M183 1EB6 00 - FF ---

M184 1EB7 00 - FF ---

M185 1EB8 00 - FF ---

M186 1EB9 00 - FF ---

M187 1EBA 00 - FF ---

M188 1EBB 00 - FF ---

M189 1EBC 00 - FF ---

M190 1EBD 00 - FF ---

M191 1EBE 00 - FF ---

M192 1EBF 00 - FF ---

M193 1EC0 00 - FF ---

M194 1EC1 00 - FF ---

M195 1EC2 00 - FF ---

M196 1EC3 00 - FF ---

M197 1EC4 00 - FF ---

M198 1EC5 00 - FF ---

M199 1EC6 00 - FF ---

M200 1EC7 00 - FF ---

M201 1EC8 00 - FF ---

M202 1EC9 00 - FF ---

M203 1ECA 00 - FF ---

Item No. Item Variable range Setting value

M204 1ECB 00 - FF ---

M205 1ECC 00 - FF ---

M206 1ECD 00 - FF ---

M207 1ECE 00 - FF ---

M208 1ECF 00 - FF ---

M209 1ED0 00 - FF ---

M210 1ED1 00 - FF ---

M211 1ED2 00 - FF ---

M212 1ED3 00 - FF ---

M213 1ED4 00 - FF ---

M214 1ED5 00 - FF ---

M215 1ED6 00 - FF ---

M216 1ED7 00 - FF ---

M217 1ED8 00 - FF ---

M218 1ED9 00 - FF ---

M219 1EDA 00 - FF ---

M220 1EDB 00 - FF ---

M221 1EDC 00 - FF ---

M222 1EDD 00 - FF ---

M223 1EDE 00 - FF ---

M224 1EDF 00 - FF ---

F001 DD 0 - 1 ---

F002 RAM REF 0 - 1 ---

D001 RESERV 0 - 255 ---

Z001 RESERV 0 - 255 ---

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT

Item

WHITE BALANCE (HIGHLIGHT)

Measuring

instrument

Remote control unit

Signal generator

Test point Adjustment part Description

[1.ADJUST] S001: R DRIVE (Red drive) S002: G DRIVE (Green drive) S003: B DRIVE (Blue drive)

(1) Receive a PAL 75% all white signal. (2) Set PICTURE MODE to "STANDARD". (3) Set ZOOM to "FULL". (4) Set COLOUR TEMP. to "NORMAL". (5) Select "1.ADJUST" from the SERVICE MODE. (6) Adjust to Keep one of <S001> (Red drive),

<S002> (Green drive) or <S003> (Blue drive) unchanged, then lower the other two so that the all-white screen is equally white throughout.

NOTE:

Set one or more of <S001>, <S002>, and <S003> to "137".

(7) Check that white balance is properly tracked

from low light to high light. If the white balance tracking is deviated, adjust to correct it.

(8) Press the [MUTING] key to memorize the set

value.

(No.YA545)1-21

SECTION 5

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

TMP 0 L 1 0 L 2 0 DDT 0 FAN 0 L C 0

IRS 0

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 00 00

TROUBLESHOOTING

5.1 SELF CHECK FEATURE

5.1.1 OUTLINE

This unit comes with the "Self check" feature, which checks the operational state of the circuit and displays/saves it during failure.Diagnosis is performed when power is turned on, and information input to the main microcomputer is monitored at all time.Diagnosis is displayed in 2 ways via screen display and LED flashes. Failure detection is based on input state of I

C bus and

the various control lines connected to the main microcomputer.

5.1.2 HOW TO ENTER THE SELF CHECK MODE

Before enter the SELF CHECK MODE, press the [MODE] key to confirm that "TV" position is indicated. If it is in a wrong position, the SELF CHECK MODE operation cannot be performed.

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

simultaneously, then enter the SERVICE MODE. (2) Press the [2] key SELF CHECK MODE. (3) Press the [RED] key to enter Page 2 of the SELF CHECK

MODE.

*Use the [GREEN] key to toggle between Page 1 and Page 2.

NOTE:

When a number key other than the [2] key is pressed in the SERVICE MODE screen, the other relevant screen may be displayed. This is not used in the SELF CHECK MODE. Press the

[MENU] key to return to the MAIN MENU SCREEN.

5.1.3 HOW TO EXIT THE SELF CHECK MODE To Save Failure History:

Turn off the power by unplugging the AC power cord plug when in the Self check display mode.

To Clear (Reset) Failure History:

Turn off the power by pressing the [POWER] key on the remote control unit when in the Self check display mode.

5.1.4 FAILURE HISTORY

Failure history can be counted up to 9 times for each item. When the number exceeds 9, display will remain as 9. Failure history will be stored in the memory unless it has been deleted.

5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE

In addition to circuit failures (abnormal operation), the following cases may also be diagnosed as "Abnormal" and counted.

(1) Temporary defective transmissions across circuits due to

pulse interruptions.

(2) Misalignment in the on/off timing of power for I

C bus (Vcc)

when turning on/off the main power. Therefore, turn on the main power, and then wait for about 3 seconds before starting Self check. If recurrences are expected, ensure to clear (reset) the failure history and record the new diagnosis results.

SERVICE MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

Press [2] key

SELF CHECK MODE SCREEN (Page 1)

Item

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

HOUR 131070 MAX 00 00

Press [Red] key

Failure history

Failure

Item

history

Press [Green] key

SELF CHECK MODE SCREEN (Page 2)

1-22 (No.YA545)

Not used

TMP 0 L 1 0 L 2 0 DDT 0 FAN 0 L C 0

IRS 0

Fig.5-1

5.1.6 DETAILS

Self check is performed for the following items: (---- is not used items)

Detection item Display Detection content

Low bias line short protection

---- FAN ---- ---- ----

---- AUD ---- ---- ----

Devices on the ANALOG PWB

Devices on the DIGITAL PWB

Detection item Display Detection content

---- TMP ---- ---- ----

---- L1 ---- ---- ----

---- L2 ---- ---- ----

---- DDT ---- ---- ----

---- FAN ---- ---- ----

---- LC ---- ---- ----

---- IRS ---- ---- ----

LOB [LT-42DP8BG/P, LT-42DP8BJ/P]

Confirm the operation of the low bias (5V / 12V /

13.5V) protection circuit. , Q9601, Q9703 [DC-DC PWB]

Q9401

[LT-42P80BU/P]

Confirm the operation of the low bias (5V / 12V /

13.5V) protection circuit. , Q9601, Q9801 [DC-DC PWB]

Q9401

ANA Confirmation of reply of ACK signal which uses

I2C communication.

, IC102, IC601, IC3501, TU3001

IC101

[ANALOG PWB]

DIG Confirmation of reply of ACK signal which uses

I2C communication.

IC5001

[DIGITAL PWB]

Diagnosis

signal (line)

LB_PRO Detection starts 3 seconds after

the power is turned on. If error continues between 200 ms the power is turned off.

SDA Detection starts 3 seconds after

the power is turned on. If it checks whenever I2C communication is performed and no reply of ACK signal an error will be counted.

SDA Detection starts 3 seconds after

the power is turned on. If it checks whenever I2C communication is performed and no reply of ACK signal an error will be counted.

Diagnosis

signal (line)

Detection timing

5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT

In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.

Type of error POWER LED flash cycle

Low bias line short protection POWER LED turnig on and off at 1 second intervals.

If error is detected, the power is turned off. Shortly after a power is turned off, POWER LED will be blinked. Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.

(No.YA545)1-23

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

(No.YA545)

Printed in Japan

VPT

SCHEMATIC DIAGRAMS

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

YA494200611

LT-42DP8BG/P, LT-42DP8BJ LT-42P80BU

CD-ROM No.SML200708

/P,

BASIC CHASSIS

FL5

No.YA545

2007/8

LT-42DP8BG/P, LT-42DP8BJ/P, LT-42P80BU/P

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

: R209

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 FR

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.YA545)2-1

CONTENTS

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

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

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

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

ANALOG PWB CIRCUIT DIAGRAM ........................................................................................................... 2-7

DIGITAL PWB CIRCUIT DIAGRAM .......................................................................................................... 2-19

POWER PWB CIRCUIT DIAGRAM .......................................................................................................... 2-53

LED PWB CIRCUIT DIAGRAM ................................................................................................................. 2-59

SW PWB CIRCUIT DIAGRAM ................................................................................................................. 2-61

DC-DC PWB CIRCUIT DIAGRAM ............................................................................................................. 2-63

PATTERN DIAGRAMS .............................................................................. 2-65

ANALOG PWB PATTERN ........................................................................................................................ 2-65

DIGITAL PWB PATTERN ......................................................................................................................... 2-67

POWER PWB PATTERN .......................................................................................................................... 2-71

LED PWB PATTERN ................................................................................................................................ 2-73

SW PWB PATTERN ................................................................................................................................ 2-73

DC-DC PWB PATTERN ............................................................................................................................ 2-74

VOLTAGE CHARTS .................................................................................. 2-75

WAVEFORMS ............................................................................................ 2-77

USING P.W. BOARD

P.W.B ASS㵭Y name LT-42DP8BG/P LT-42DP8BJ/P

ANALOG P.W. BOARD SW P.W. BOARD LED P.W. BOARD POWER P.W. BOARD DC-DC P.W. BOARD DIGITAL P.W. BOARD

SFL-1251A-U2 SFL-7215A-U2 SFL-8721A-U2 SFL-9080A-U2 SFL-9188A-U2 LCA10737-18A(SFL-0D564A)

SFL-1252A-U2

SFL-8724A-U2

SFL-9193A-U2 LCA10737-19A(SFL-0D565A)

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

E C B

BOTTOM VIEW FRONT VIEW TOP VIEW

OUT E IN

ECB

IN OUTE

(G)E(S)C(D)

1 N

ECB

1 N

CHIP TR

LT-42P80BU/P

CHIP IC

2-2(No.YA545)

TOP VIEW

WIRING DIAGRAM

SPEAKER (R) SPEAKER (L)

CONTROL PWB

LCD PANEL UNIT

INVERTER PWB

(MASTER SIDE)

INVERTER PWB

(SLAVE SIDE)

TOP

[only LT-42DP8 series]

CN0SR

ANALOG PWB

CN0UD

101

CN0SL

[only LT-42DP8 series]

CN10F

CN0UV

CN001

CN002

CN00U

CN00R

CN00H

123

131

501401

101

TOP

CN00H

123

150140

DC-DC PWB

CN001

CN002

CN0DC

115

CN0DC

[only LT-42DP8 series]

DIGITAL PWB

CN00A

15 1

115

CN0ID

CN000W

CN0LV1

TOP

112

41 1

15 1

41 21

CN00A

CN00F

CN00W

CN00P

114

CN00Q

110

POWER PWB

FRONT

TOP

SW PWB

CN200R

ANALOG

TUNER

TOP

PL302

16113110

PL301PL103

F9001

250V/6.3A

CN0PW

TOP

POWER CORD

DIGITAL TUNER MODULE PWB

TOP

[only LT-42DP8 series]

LED PWB

110

CN100U

2-4(No.YA545)(No.YA545)2-3

BLOCK DIAGRAM

EXT-1

EXT-2

S-VIDEO

EXT-3

L/R

PC INPUT

TU3001

UHF/VHF TUNER

TV_MAIN

IC105

VIDEO AMP

MON_TV TV_L/R

R1/G1/B1 Y1/C1 V1 L1/R1

R2/G2/B2 Y2/C2 V2 L2/R2

MON_V MON_L/R

Y3/C3 V3

L3/R3

PC_R/G/B

TV_SIF TV_MONO

IC3501

DEC_Y

DTU_VIN

V1_VIN V2_VIN V3_VIN

V1_YIN V2_YIN V3_YIN

MULTI SOUND PROCESS

AGC

A-D

DEMOD.

VIDEO/AUDIO SELECT

IC101

MATRIX

Y/C MIX

D-A

MAIN_VY

SUB_VY

TV_L/R

EXT-5

EXT-6

[only LT-42DP8 series]

HDMI

DIGITAL

TUNER

MODULE

HDMI

RECEIVE

IC7602

MEMORY

DTU_Y/Cb/Cr DTU_VIN DTU_LIN/RIN

DV1_R0-7 DV1_Y0-7 DV1_B0-7

DIN_DL/DR

TEXT_R/G/B

MAIN_CCD

IC7301

MAIN CPU

UKD_TX UKD_RX

OSDR1-5/ OSDG1-5/ OSDB1-5

IC6001

YC SEPARATE/ CHROMA DEMODURATE/ FORMAT CONVERT/ NOISE REDUCT/ RGB PROCESS/ OSD COMPOSITION/ SUB CPU

SUB_VY YM_IN/

BYM_IN/ RYM_IN

MI_TX/ MI_RX/ MI_CLK

A-D CONVERT

YC SEPARATE/

CHROMA DEMOD./

FORMAT CONVERT/

NOISE REDUCT

SD_DQ1-32

A0-21 D0-15

SUB CPU

IC6101

FRAME

MEMORY

IC7201

PROGRAM

MEMORY

IC7203

PROGRAM

MEMORY

IC5002 IC5003

FRAME

MEMORY

ADRS

IC5001

FRAME INTERPOLATE/

LCD CONTROL/

LVDS DRIVE

RGB

PROCESS

OSD

MIX

DIGITAL PWB

LVR0-7/ LVG0-7/ LVB0-7

RE(0)P/N RE(1)P/N RE(2)P/N RE(3)P/N RECLK+/-

RO(0)P/N RO(1)P/N RO(2)P/N RO(3)P/N ROCLK+/-

LCD PANEL

Pb/Cb

EXT-4

Pr/Cr

L/R

AUDIO OUT L/R

Y4/CB4/CR4

L4/R4

MON_V

IC104

VIDEO

AMP

V1_CIN V2_CIN V3_CIN

DTU_LIN/RIN

DIN_L/R

TV_L/R V1_LIN/RIN V2_LIN/RIN V3_LIN/RIN V4_LIN/RIN

FIX_L/R

MON_L/R

MON_VOUT

Y/C MIX

MAIN_C

SUB_C

MAIN_L/R

MAIN_VY

PC_G

V4_Y

DTU_Y

TEXT_G

SUB_C

PC_B

V4_Cb

DTU_Cb

TEXT_B MAIN_C

PC_R

V4_Cr

DTU_Cr

TEXT_R

IC102

VIDEO SELECT

G1 G2

B1 B2

R1 R2

IC601

CONVERT

Y_OUT

BY_OUT

RY_OUT

AUDIO CONTROL

A-D

BASS

BOOST

ANALOG PWB

STEREO

BOOST

TREBLE

BOOST

EQUALIZE

VOLUME

D-A

CONVERT

IC751

HEADPHONE

AMP

AMP_L/R

AUDIO OUT

IC6001

KEY_1/2

MECA_SW

HP_L/R

POWER_LED

REMOCON

EE_CDS

SW PWB

CONTROL

SWITCH

S7801㨪S7806

S7807

J7101

LED PWB

D8771/ D8772

POWER

IC8772

IR RECEIVE

IC8771

E.E. SENSOR

SPEAKER (L)

SPEAKER (R)

POWER

HEADPHONE

(No.YA545)2-5 2-6(No.YA545)

+ 66 hidden pages