JVC LT-26DF7BC-BK Schematic

SERVICE MANUAL

YA487200612SERVICE MANUAL

WIDE LCD PANEL TELEVISION

LT-26DF7BC, LT-26DF7BK

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

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

No.YA487

2006/12

SPECIFICATION

Items LT-26DF7BC LT-26DF7BK

Dimensions ( W × H × D ) 70.0cm × 53.5cm × 22.0cm [Included stand]

70.0cm × 50.0cm × 12.8cm [TV only]

Mass

Power Input AC220 - 240V, 50Hz

Power Consumption 160W (Standby: 2.7W)

TV RF System Analog

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

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

Receiving Frequency Analog VHF: 46.25 MHz - 470 MHz

Intermediate Frequency

Colour Sub Carrier Frequency

Teletext System Analog TOP, FLOF (Fastext level 2.5), WST(World Standard system)

LCD panel 26V-inch wide aspect (16:9)

Screen Size Diagonal : 66.0cm (H:57.6cm × V : 32.4cm) Display Pixels Horizontal : 1366 dots × Vertical : 768 dots (W-XGA)

Audio Power Output 8W + 8W(10% THD)

Speaker 5.1cm × 12.7cm oval type × 2 / 1.2cm round type × 2 Aerial terminal (VHF/UHF) EU-type connector, 75Ω unbalanced, coaxial EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) × 2

EXT-3(Input) Component Video

625p / 525p / 625i / 525i

EXT-4 (Input) S-Video

EXT-5 (Input / Output) HDMI 19pin connector × 1 PC (RGB) Input D-sub 15pin × 1

PC AUDIO Input 3.5mm stereo mini jack × 1

Audio Output Analog

Headphone 3.5mm stereo mini jack × 1 Card Slot CAM(Conditional Access Module) × 1 Remote Control Unit RM-C1897S (AA/R6 dry cell battery × 2) RM-C1895 (AA/R6 dry cell battery × 2)

SECAM

/ 750p / 1125i

Design & specifications are subject to change without notice.

12.0kg [Included stand]

10.3kg [TV only]

CCIR (B/G, I, D/K, L)

Digital

DVB-T

UHF: 470 MHz - 862.25 MHz

Digital 47 MHz - 858 MHz 474 MHz - 858 MHz

CATV

S1 - S20 / S21 - S41

VIF

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

SIF

33.4 MHz (5.5 MHz: B/G)

32.9 MHz (6.0 MHz: I)

32.4 MHz (6.5 MHz: D/K, L)

PAL

4.43 MHz

4.40625 MHz / 4.25MHz

NTSC

3.58 MHz / 4.43 MHz

Digital Digital Teletext (VBI insertion) Digital Teletext (Mheg5)

RCA pin jack × 3 Y : 1V (p-p), Positive (Negative sync provided), 75 Ω Cb/Cr : 0.7V(p-p), 75 Ω

Audio

500mV(rms) (-4dBs), high impedance, RCA pin jack × 2 Mini-DIN 4 pin × 1

Y: 1V (p-p), Positive (Negative sync provided), 75 Ω C: 0.286V (p-p) (Burst signal), 75 Ω

Video

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

Audio

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

R/G/B : 0.7V (p-p), 75Ω

HD / VD : 1V (p-p) to 5V (p-p), high impedance < Available signal > Horizontal : 30kHz - 69kHz Vertical : 50Hz - 75Hz [Resolution : 640 pixels × 480 pixels(VGA), 720 pixels × 400 pixels, 800 pixels × 600 pixels(SVGA),

1024 pixels

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

Digital

AC3 compatible, RCA pin jack × 1

768 pixels(XGA), 1280pixels×768pixels,1360 pixels × 768 pixels]

1-2 (No.YA487)

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 ME TAL PAR T

(No.YA487)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.YA487)

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

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.

1.3.3 NOTES ON HANDLING

(1) WHEN TAKING UNIT OUT OF A PACKING CASE

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.

(2) AS FOR PRESSING OR TOUCHING A SPEAKER

Be careful not to press the opening of the speaker in the lower part of the unit and around them since the decorative sheet on the surface of the openings may be deformed.

100 mm

*Diagram differs from actual appearance.

100 mm

50 mm

(No.YA487)1-5

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.

1.4.2 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.

1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS

Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.):

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

surface). It may cause irregular COLOUR.

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

LCD panel (filter surface) with hands.

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

be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).

1-6 (No.YA487)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

DVB-T (DIGITAL TERRESTRIAL BROADCASTING)

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

HDMI (High Definition Multimedia Interface)

HDMI is the first industry supported, uncompressed, all digital audio/video interface. By connecting an HDMI compatible device, high definition pictures can be displayed on your TV in their digital form.

3D COMB

3D Comb is used to improve colour transitions and colour quality of pictures.

2.2 MAIN DIFFERENCE LIST

Item LT-26DF7BC LT-26DF7BK

POWER CORD EU type(2-pin) UK type(3-pin)

REMOTE CONTROL UNIT VE-30044649(RM-C1897S) VE-30034033(RM-C1895)

DIGITAL TUNER PWB VE-30049956 VE-30049951

T-V LINK

When you have a T-V LINK compatible VCR connected to the EXT-2 Terminal on the TV,it is easier to set up the VCR and to view videos.

ZOOM

This function can change the screen size according to the picture aspect ratio.

OFF TIMER

This function can set the TV to automatically turn off after a set time.

COLOUR SYSTEM

If the picture is not clear or no colour appears, change the current colour system to another colour system.

2.3 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)

9 GND (G) Used Used

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

11 G input 700mV

12 SDA Not used Not used

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 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 Used

(B-W)

Used Used

, 75Ω Used Used

(B-W)

, 75Ω

(B-W)

, 75Ω

(P-P)

(Negative sync), 75Ω Used (TV OUT) Used (LINE OUT) (Negative sync), 75Ω Used (V1) Used (Y/V2)

Used (R) Used (C/R)

(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

(No.YA487)1-7

2.4 TECHNICAL INFORMATION

2.4.1 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.

2.4.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications Remarks

Displayed colour 16777216 colours 256 colours for R, G, and B

Brightness 500cd/m

Contrast ratio 800 : 1

Response time 8ms

View angle Horizontally: 176°, Vertically: 176°

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.

1-8 (No.YA487)

2.5 BASIC OPERATION OF SERVICE MODE

2.5.1 HOW TO ENTER THE SERVICE MODE

(1) Press [MENU] key on the remote control unit to enter the

MENU screen.

(2) Press [INFORMATION] key and [MUTING] key on the re-

mote control unit simultaneously to enter the SERVICE MODE SCREEN.

SERVICE MODE SCREEN

Picture Adjust SOUND1 SOUND2 Options TV Norm Features Teletext Source Menu Languages 1 Menu Languages 2 Tuner Options

26 AU V5 EX59 JVC PaNEU IDTV L7 V0.40

2.5.2 HOW TO EXIT THE SERVICE MODE Press the [MENU] key to exit the Service mode.

2.5.3 CHANGE AND MEMORY OF SETTING VALUE

 SELECTION OF SETTING MENU & ITEM

• [FUNCTION /] key : Select the SETTING MENU & ITEM

• [OK] key : Decide the SETTING MENU & ITEM

 CHANGE OF SETTING VALUE (DATA)

• [FUNCTION /] key

 MEMORY OF SETTING VALUE (DATA)

The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.

2.5.4 SERVICE MODE SELECT KEY LOCATION

[MUTING]

[INFORMATION]

[OK]

[FUNCTION ]

Service menu

[MENU]

[FUNCTION ]

2.5.5 SERVICE MODE SETTING ITEMS

Setting menu Setting items

Picture Adjust Source

Mode

Colour Temp.

Contrast

Brightness

Sharpness

Colour

Backlight

SOUND1 Menu Subwoofer

Subwoofer Level (dB)

Subwoofer Corner Freq. (x10Hz)

Menu Equalizer

Menu Headphone

Menu Hyper Sound

Menu Wide Sound

Menu Dynamic Bass

Menu Virtual Dolby

Carrier Mute

Virtual Dolby Text

SOUND2 AVL

Menu AVL

FM PRESCALE AVL ON

NICAM PRESCALE AVL ON

SCART PRESCALE AVL ON

SCART VOLUME AVL ON

FM PRESCALE AVL OFF

NICAM PRESCALE AVL OFF

SCART PRESCALE AVL OFF

SCART VOLUME AVL OFF

Options Burn-In Mode

First APS

APS Volume

AGC (dB)

Power-Up Mode

Factory Reset

Enter Flash Mode

Reset Eeprom

(No.YA487)1-9

Setting menu Setting items

TV Norm BG

Features PIP/PAP

Blue Background

Menu Transparency

Menu Timeout

Backlight

Single Tuner

Dynamic WB

Zoom Mode Blank

Teletext TOP TXT

Fast TXT

Teletext Language

Menu Teletext Language

Source TV

SC1

SC2

SC2 SVHS

SC3

SC3 SVHS

YPBPR

FAV

SVHS

HDMI

Menu Languages 1 English

German

French

Turkish

Spanish

Danish

Swedish

Dutch

Italian

Greek

Portuguese

Norwegian

Setting menu Setting items

Menu Languages 2 Finnish

Polish

Czech

Hungarian

Russian

Slovak

Slovenian

Rumanian

Bulgarian

Croatian

Serbian

Hebrew

Tuner Options Main Tuner

PIP Tuner

1-10 (No.YA487)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

NOTE:

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

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

• When removing each board, remove the connectors as required.

• Taking notes of the connecting points (connector numbers) makes service procedure manageable.

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

3.1.1 REMOVING THE FOOT ASSEMBLY

(1) Remove the 6 screws [A]. (2) Remove the FOOT ASSEMBLY.

3.1.2 REMOVING THE BACK COVER

• Remove the FOOT ASSEMBLY. (1) Remove the 10 screws [B]. (2) Remove the 2 screws [C], 2 screws [D] and 2 screws [E]. (3) Remove the BACK COVER.

3.1.3 REMOVING THE HANGER WALL METAL

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [F]. (2) Remove the HANGER WALL METAL. (3) Remove the opposite one by the same method.

3.1.4 REMOVING THE SIDE CONTROL PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [G]. (2) Remove the FUNCTION BUTTON BRACKET. (3) Remove the 2 screws [H]. (4 ) Remove the FUNCTION BUTTON with the SIDE CONTROL PWB. (5) Remove the 4 claws, which is fixing the SIDE CONTROL PWB. (6) Remove the SIDE CONTROL PWB.

3.1.5 REMOVING THE AV JACK PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [J]. (2) Remove the AV JACK BRACKET. (3) Remove the 4 screws [K]. (4) Remove the AV JACK PWB.

3.1.6 REMOVING THE AMPLIFIER PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 4 screws [L]. (2) Remove the AMPLIFIER PWB.

3.1.7 REMOVING THE POWER PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 4 screws [M]. (2) Remove the POWER PWB.

3.1.8 REMOVING THE MAIN PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [N]. (2) Remove the SOCKET COVER BRACKET. (3) Remove the 7 screws [P]. (4) Remove the MAIN PWB.

3.1.9 REMOVING THE DIGITAL TUNER PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the COMMON INTERFACE BRACKET. (2) Remove the 3 screws [R]. (3) Remove the DIGITAL TUNER PWB.

3.1.10 REMOVING THE NOISE FILTER PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 3 screws [S]. (2) Remove the NOISE FILTER PWB with the POWER INLET

BRACKET. (3) Remove the 2 screws [T]. (4) Remove the NOISE FILTER PWB.

3.1.11 REMOVING THE LED PWB

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [U]. (2) Remove the LED PWB.

3.1.12 REMOVING THE MAIN SPEAKER AND TWEETER

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [V]. (2) Remove the MAIN SPEAKER. (3) Remove the opposite MAIN SPEAKER by the same method. (4) Remove the 2 screws [W]. (5) Remove the TWEETER. (6) Remove the opposite TWEETER by the same method.

3.1.13 REMOVING THE LCD PANEL UNIT

• Remove the FOOT ASSEMBLY.

• Remove the BACK COVER.

• Remove the MAIN SPEAKER. (1) Remove the 8 screws [X] and 4 screws [Y]. (2) Remove the FRAME. (3) Slightly raise the both sides of the LCD PANEL UNIT by hand

and remove the LCD PANEL UNIT from the FRONT PANEL.

NOTE:

• Pay special attention not to break or damage on the front of

the LCD PANEL.

• The LCD PANEL UNIT is fixed to the FRONT PANEL (at the

back side) by using double-side adhesive tapes. To remove the LCD PANEL UNIT, remove the adhesive tape on the FRONT PANEL slowly.

(No.YA487)1-11

BACK COVER

COMMON

INTERFACE

COVER

POWER

PWB

DIGITAL TUNER

PWB

HANGER WALL

METAL

AV JACK

BRACKET

FUNCTION

BUTTON

AV JACK

PWB

AMPLIFIER

PWB

MAIN PWB

BRACKET

SIDE

CONTROL

PWB

FUNCTION

BUTTON

FRAME

COMMON

INTERFACE

BRACKET

POWER INLET

BRACKET

NOISE

FILTER

PWB

SOCKET COVER

LCD PANEL

LED PWB

UNIT

BRACKET

FOOT ASSEMBLY

MAIN SPEAKER

TWEETER

FRONT PANEL

1-12 (No.YA487)

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.

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

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

3.2.1 SETTINGS OF FACTORY SHIPMENT

3.2.1.1 BUTTON OPERATION 3.2.1.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

TV/AV TV

3.2.1.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE

Setting item Setting position

Mode Bright

Contrast 60

Brightness 30

Sharpness 20

Colour 65

Colour Temp. Cool

Noise Reduction Minimum

Film Mode Off

3D Comb Off

(2) SOUND

Setting item Setting position

Volume 0

Bass 0

Treble 0

Balance 0

Sound Mode Mono

Hyper sound Off

Setting item Setting position

ZOOM Auto

Hyper Sound Off

(3) FEATURE

Setting item Setting position

Sleep Timer Off

Child Lock Off

Language English

EXT-2 Output TV

Default Zoom Panoramic

Blue Back Off

(4) INSTALLATION

Setting item Setting position

Colour System AUTO

Decoder(EXT-2) Off

VCR Off

(No.YA487)1-13

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.

1-14 (No.YA487)

(4) Then solder leads B and C.

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.YA487)1-15

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

(No.YA487)

Printed in Japan

VPT

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