Panasonic TX-L24X5B, TX-L24X5E, TX-LR24X5 Schematic

ORDER NO. : PCZ1207125AE

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Service Manual

LCD TV

Model No.

TX-L24X5B

TX-L24X5E TX-LR24X5

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by

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electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

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There are special components used in this equipment which are important for safety. These are marked by in the Schematic Diagrams,

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Circuit Board Diagrams. Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced with manufacture’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of manufacturer.

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IMPORTANT SAFETY NOTICE

WARNING

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Unauthorized copying and distribution is a

violation of law.

CONTENTS

SAFETY PRECAUTIONS........................................... 3

GENERAL GUIDE LINES........................................... 3

WARNING................................................................... 4

PREVENTION OF ELECTROSTATIC DISCHARGE (ESD) TO ELECTROSTATICALLY SENSITIVE (ES)

DEVICES.................................................................... 4

ABOUT LEAD FREE SOLDER (PBF)......................... 5

EXPLODED VIEW AND REPLACEMENT

PARTS LIST ............................................................... 6

EXPLODED VIEW ...................................................... 6

REPLACEMENT PARTS LIST.................................... 7

Safety Precautions

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.

4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.

5. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or

some of the wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the

entire wiring unit instead.

6. When conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or unplug

them straight out.

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 100 Mohm and

over. When the exposed metal does not have a

return path to the chassis, the reading must be

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 1.5kohm, 10 watts resistor, in parallel

with 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.

Figure 1

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