Panasonic TX-15LT2M Manuel utilisateur

Power Source

AC 100~240V, 50/60Hz

Power Consumption

Average use: 49W

Stand-by condition: 4W

TV set: DC 15V, 2.8 A max.

LCD

15.2-inch (385mm), 16:9 aspect ratio LCD panel

Screen Size

13.21-inch (335.6mm) (W) x 7.43-inch (188.6mm)(H) x 15.2-

inch (385.0mm)(Diagonal)

Sound

Speaker

Tweeter (3 x 4cm 2pcs, 89), Woofer (Ø5cm, 89)

Audio Output

6.5W (2.0W+2.0W+2.5W (Woofer)), 10%THD

Headphones

M3(3.5 mm) Jack x 1 89impedance

FEATURES

Aero-Hammer®Woofer System (2Way 3Speaker System)

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-15LT2M

TX-15LT2Q

TX-15LT2Z

TX-15LT2X

TX-15LT2T

LH1 Chassis

Receiving System

Receiving Channels

Regular TV

VHF BAND

2-12 (PAL/SECAM B, K1)

0-12 (PAL B AUST.)

1-9 (PAL B N.Z)

1-12 (PAL/SECAM D)

1-12 (NTSC M Japan)

2-13 (NTSC M U.S.A)

UHF BAND

21-69 (PAL G, H, I/SECAM G, K, K1)

28-69 (PAL B AUST.)

13-57 (PAL D, K)

15.2” Diagonal LCD TV

Specifications

ORDER NO. ITD0303001C2

13-62 (NTSC M Japan)

14-69 (NTSC M U.S.A)

CATV

S1-S20 (OSCAR)

1-125 (U.S.A CATV)

C13-C49 (JAPAN)

S21-S41 (HYPER)

Z1-Z37 (CHINA)

5A, 9A (AUST.)

Aerial-Rear

UHF/VHF

Operating Conditions

Temperature: 5-40°C

Humidity: 5%-90% RH (non-condensing)

Connection Terminals

AV1

21 Pin socket

(Audio/ Video in, TV out, RGB in)

AV2

1 Safety Precautions 4

1.1. General Guidelines 4

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices 5

3 About lead free solder (PbF) 6

4SelfCheck 7

5 SERVICE HINTS 7

5.1. Hotel Mode 7

6 Chasis Board Layout 8

7 Servicing method 9

7.1. Removing tilt base 9

7.2. Removing rear panel 10

7.3. Removing speaker unit 10

7.4. Removing front panel 11

7.5. Removing LCD panel 11

7.6. Removing main A-Board 12

7.7. Removing B-Board (with tuner assembly) 13

7.8. Removing DG-Board 14

7.9. Removing H-Board 14

7.10. Removing P-Board 15

7.11. Removing K-Board 15

7.12. Pull out the flexible cable straight to the coupler. 15

7.13. Removing back-light 16

7.14. A-Board servicing 16

8 Service Mode Function 17

VIDEO

RCA PIN Type x 1

S-VIDEO

Mini DIN 4-pin

AUDIO L-R

RCA PIN Type × 2

AUDIO OUT

3.5mm, Stereo Jack 0.5Vrms

Dimensions (W x H x D)

Including TV Stand

413mm x 330mm x 180mm

TV Set Only

413mm x 295mm x 73mm

Weight (Mass)

5.6kg Net

Storage Conditions

Temperature: 55°C MAX

Note:

Design and Specifications are subject to change without notice.

Weight and Dimensions shown are approximate.

8.1. How to enter SERVICE 1 17

8.2. How to enter SERVICE 2 17

8.3. Option Description 19

8.4. Option Code Setting 21

9 Adjustment 22

9.1. RF AGC Adjustment 22

9.2. DVCO Adjustment 22

10 Conductor Views 23

10.1. A-Board 23

10.2. B, H, K, P and V-Board 25

10.3. DG-Board 27

11 Block and Schematic Diagrams 29

11.1. Schematic Diagram Notes 29

11.2. Power Block Diagram 30

11.3. Signal Block Diagram 32

11.4. A-Board (1 of 4) Schematic Diagram 34

11.5. A-Board (2 of 4) Schematic Diagram 35

11.6. A-Board (3 of 4) Schematic Diagram 36

11.7. A-Board (4 of 4) Schematic Diagram 37

11.8. DG-Board (1 of 5) Schematic Diagram 38

11.9. DG-Board (2 of 5) Schematic Diagram 39

11.10. DG-Board (3 of 5) Schematic Diagram 40

11.11. DG-Board (4 of 5) Schematic Diagram 41

11.12. DG-Board (5 of 5) Schematic Diagram 42

11.13. B, H, K, and V-Board Schematic Diagram 43

CONTENTS Page Page

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

11.14. P-Board Schematic Diagram 44

12 Parts Location & Mechanical Replacement Parts List 45

12.1. Parts Location 45

12.2. Packing Exploded View 46

12.3. Mechanical Replacement Parts List 47

13 Replacement Parts List 48

13.1. Replacement Parts List Notes 48

13.2. Electrical Replacement Parts List Notes 49

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

1.1.1. Leakage Current Cold Check

1.Unplug the AC cord and connect a jumper between the two

prongs on the plug.

2.Measure the resistance value, with an ohmmeter, between

the jumpered AC plug and each exposed metallic cabinet

part on the equipment such as screwheads, connectors,

control shafts, etc. When the exposed metallic part has a

return path to the chassis, the reading should be between

1M9and 5.2M9.

When the exposed metal does not have a return path to

the chassis, the reading must be .

Figure 1

1.1.2. Leakage Current Hot Check (See

Figure 1.)

1.Plug the AC cord directly into the AC outlet. Do not use an

isolation transformer for this check.

2.Connect a 1.5k9, 10 watts resistor, in parallel with a 0.15µF

capacitors, between each exposed metallic part on the set

and a good earth ground such as a water pipe, as shown in

Figure 1.

3.Use an AC voltmeter, with 1000 ohms/volt or more

sensitivity, to measure the potential across the resistor.

4.Check each exposed metallic part, and measure the

voltage at each point.

5.Reverse the AC plug in the AC outlet and repeat each of the

above measurements.

6.The potential at any point should not exceed 0.75 volts

RMS. A leakage current tester (Simpson Model 229 or

equivalent) may be used to make the hot checks, leakage

current must not exceed 1/2 milliamp. In case a

measurement is outside of the limits specified, there is a

possibility of a shock hazard, and the equipment should be

repaired and rechecked before it is returned to the

customer.

1 Safety Precautions

1.1. General Guidelines

1.When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or

damaged by the short circuit.

2.After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly

installed.

3.After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

2 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called

Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and

semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage

caused by electro static discharge (ESD).

1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your

body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,

which should be removed for potential shock reasons prior to applying power to the unit under test.

2.After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alminum

foil, to prevent electrostatic charge buildup or exposure of the assembly.

3.Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4.Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can

generate electrical charge sufficient to damage ES devices.

5.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6.Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most

replacement ES devices are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable

conductive material).

7.Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material

to the chassis or circuit assembly into which the device will be installed.

Caution

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8.Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise hamless motion such as the brushing

together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to

damage an ES device).

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

3 About lead free solder (PbF)

Note: Lead is listed as (Pb) in the periodic table of elements.

In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.

The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).

That is Tin (Sn), Silver (Ag) and (Cu) although other types are available.

This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d

suggest the use of Pb free solder as well, although Pb solder may be used.

PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the back of PCB.

Caution





·



Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F (30 ~ 40 °C) higher.

Please use a high temperature soldering iron and set it to 700 ± 20 °F (370 ± 10 °C).





·



Pb free solder will tend to splash when heated too high (about 1100 °F or 600 °C).

If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb

solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.





·



After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto

the opposite side. (see figure below)

Suggested Pb free solder

There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder.

However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

4SelfCheck

1.Self-Check is used to automatically check the bus lines and hexadecimal code of the TV set.

2.To get into the Self -Check mode press the [ Down ( ) ] button on the customer controls at the front of the set, at the same

time pressing the [ SET UP ] button on the remote control, and the screen will show :

If the CCU ports have been checked and found to be incorrect or not located then “--” will appear in place of “O.K.”.

5 SERVICE HINTS

5.1. Hotel Mode

Purpose

1.At Hotels, this Mode prevent customer from changing the TV preset data, such as Channel preset data.

Note:

This Mode is useful for hotel, you should not get into “Hotel Mode” with Normal use.

Operation

1.To get into “ Hotel Mode”, press “Recall” button on the remote control and Channel up “[ ]” key on the TV set

simultaneously, after setting the “Off-Timer” mode.

2.In this mode, The Channel up and down Function will be able as normal Mode, and The maximum volume level for this

mode is set at the current volume level, that means setting at the level before entering the mode. However, other function

will be disable.

3.To exit This mode, press “SET UP” button on the remote control and the “Volume Down [ ]” key on the TV set

simultaneously.

* This Information is informed by Service Manual only.

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

6 Chasis Board Layout

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

7 Servicing method

7.1. Removing tilt base

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

7.2. Removing rear panel

7.3. Removing speaker unit

TX-15LT2M / TX-15LT2Q / TX-15LT2Z / TX-15LT2X / TX-15LT2T

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