Panasonic TC-22LR30 Service manual

ORDER NO. ITD0409036C1

B19 Canada:B07

LCD TV/DVD-RAM Combination

TC-22LR30

CONTENTS

Page Page

1 SAFETY PRECAUTIONS 3

1.1. GENERAL GUIDELINES

1.2. LEAKAGE CURRENT COLD CHECK

1.3. LEAKAGE CURRENT HOT CHECK

2 LASER PRODUCT

2.1. PRECAUTION OF LASER DIODE

3 PREVENTION OF ELECTROSTATIC DISCHARGE (ESD) TO

ELECTROSTATICALLY SENSITIVE (ES) DEVICES 4 ABOUT LEAD FREE SOLDER (PbF) 5 SERVICE NOTES

5.1. SELF DIAGNOSIS FEATURE FOR TV PORTION

5.2. SELF DIAGNOSIS FOR POWER

5.3. DVD-RAM SELF DIAGNOSIS

5.4. DVD-RAM SERVICE MODE

5.5. SERVICE POSITION

5.6. WIRING (CLAMPERS & LEADS)

5.7. KIND OF LOCATION OF THE FLEXIBLE CABLE AND CONNECTOR

5.8. HOW TO REMOVE THE CONNECTOR

5.9. CHASSIS BOARD LAYOUT

5.10. HOW TO REMOVE A DISC WHEN EJECT FAIL

6 HOW TO REPLACE CIRCUIT BOARD ASSEMBLIES

10 11 14 16

17 19 20 21

3 3 3

5 6 7

7 9

6.1. REPLACEMENT PROCEDURES FOR THE BOARDS IN THE LCD TV PORTION

6.2. REPLACEMENT PROCEDURES FOR THE BOARDS IN THE DVD PORTION

7 ADJUSTMENT PROCEDURES

7.1. SERVICE FIXTURES AND TOOLS

8 SCHEMATIC DIAGRAMS

8.1. INTERCONNECTION SCHEMATIC DIAGRAM

9 BLOCK DIAGRAMS 10 EXPLODED VIEWS

10.1. LCD SECTION (1)

10.2. LCD SECTION (2)

10.3. MAIN CHASSIS SECTION

10.4. DVD SECTION

10.5. PACKING PARTS AND ACCESSORIES SECTION

11 REPLACEMENT PARTS LISTS

11.1. REPLACEMENT NOTES

11.2. MECHANICAL REPLACEMENT PARTS LIST

11.3. SERVICE FIXTURES AND TOOLS REPLACEMENT PARTS LIST

11.4. ELECTRICAL REPLACEMENT PARTS LIST

53 55

55 56 57 58 59

60 60

61 61

1 SAFETY PRECAUTIONS

1.1. GENERAL GUIDELINES

1. IMPORTANT SAFETY NOTICE There are special components used in this equipment

which are important for safety. These parts are marked by

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

2. An Isolation Transformer should always be used during the servicing of Combination LCD TV/DVD-RAM whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect Combination LCD TV/DVD-RAM from being damaged by accidental shorting that may occur during servicing.

3. When servicing, observe the original lead dress, especially the lead dress in the high voltage circuits. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

4. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shield, and isolation R-C combinations are properly installed.

5. When the TV set is not used for a long period of time, unplug the power cord from the AC outlet.

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

TC-22LR30

1.2. LEAKAGE CURRENT COLD CHECK

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

prongs on the plug.

2. For physically operated power switches, turn power on.

Otherwise skip step 2.

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

the jumpered AC plug and each exposed metallic cabinet part on the receiver, such as screwheads, connectors, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1 MΩ and 8.5 MΩ. When the exposed metal does not have a return path to the chassis, the reading must be infinity.

1.3. LEAKAGE CURRENT HOT CHECK

1. Plug the AC cord directly into the AC outlet.

Do not use a isolation transformer for this check.

2. Connect a 1.5 kΩ, 10 W resistor, in parallel with a 0.15 µF

capacitor, between each exposed metallic part on the set and a good earth ground, as shown in Figure 1.

3. Use an AC voltmeter, with 1 kΩ/V 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 inthe AC outlet and repeat each of the

above measurements.

6. The potential at any point should not exceed 0.75 V RMS.

A leakage current tester (Simpson Model 229 equivalent) may be used to make the hot checks. Leakage current must not exceed 1/2 mA. In case a measurement is outside of the limits specified, there is a possibility of shock hazard, and the receiver should be repaired and rechecked before it is returned to the customer.

Figure 1

TC-22LR30

2 LASER PRODUCT

CLASS I LASER PRODUCT

· This equipment is certified to comply with DHHS Rules 21 CFR Chapter 1, Subchapter J in effect as of date of manufacture. (Only for U.S.A.)

This equipment is classified as a Class I (Class 1) level LASER Product and there is no hazardous LASER radiation with the safety protection.

Caution:

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Never touch the internal parts in order to avoid EXPOSURE TO VISIBLE LASER RADIATION.

2.1. PRECAUTION OF LASER DIODE

Unplug the AC power cord to the equipment when opening the top cover.

When the power switch is On, do not place your eyes close to the front panel opening door or the other openings to look into the interior unit.

LASER Specification

Class I level A LASER Product (Class 1 level A LASER Product)

Wave Length: 662 nm (at DVD)

785 nm (at CD)

Laser Power: No hazardous radiation is emitted with

the safety protection.

3 PREVENTION OF ELECTROSTATIC 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 are semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electrostatic discharge (ESD).

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

TC-22LR30

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 harmless 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).

"NOTEtoCATVsysteminstaller:

This reminder is provided to call the CATV system installer’s attention to Article 820-40 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical."

TC-22LR30

4 ABOUT LEAD FREE SOLDER (PbF)

5 SERVICE NOTES

5.1. SELF DIAGNOSIS FEATURE FOR TV PORTION

5.1.1. Self Check Feature

The confirmation of the problem´s existence and focusing on the cause will be possible by Self Diagnosis.

5.1.2. How to Display

Press VOLUME- Button on the unit and SLEEP Button on the remote control unit at the same time.

5.1.3. Display on Screen

TC-22LR30

5.1.4. How to return to the normal screen

Press any key to release the Self Check Screen.

TC-22LR30

5.1.5. Display of Symptom and Remedy

5.2. SELF DIAGNOSIS FOR POWER

5.2.1. Self Diagnosis for Power

When an abnormal condition occurs in the Power Supply line, a Protection Circuit is activated and Power turns OFF. At that time, the defective line which tripped the Protection Circuit can be focused upon by the number of times the POWER

Indicator flashes red on the Front of the unit. When the protection circuit is tripped, all keys become inoperative.

5.2.2. Indication Method

The POWER Indicator flashes on the Front of the unit when an abnormal Power condition occurs.

TC-22LR30

5.2.3. Display of Symptom and Remedy

TC-22LR30

5.3. DVD-RAM SELF DIAGNOSIS

The Self Diagnosis information is indicated on the Indication Panel on the Front of the unit.

5.4. DVD-RAM SERVICE MODE

The information and condition of DVD-RAM Drive can be displayed on the Indication Panel.

5.4.1. How to enter DVD-RAM Service Mode

During Power Off condition via the Remote Control Unit, press VOLUME+, OPEN/CLOSE and STOP buttons on the unit together for more than 5 seconds.

5.4.2. How to finish DVD-RAM Service Mode

Turn Power OFF using Power Button on the unit or on the Remote Control Unit.

TC-22LR30

5.4.3. Service Mode Table

TC-22LR30

5.5. SERVICE POSITION

SERVICE POSITION (1)

SERVICE POSITION (2)

TC-22LR30

Extension Cable (RFKZ0214)

M8-Board

Note:

Use the Extension Cable (RFKZ0214) between the M8-Board and the RD-Board Extension Cable (RFKZ0214) has A/V Output Signal switches. Output signals can be switched from the M8-Board side or the RD-Board side. When check the M8-Board, turn switches to the M8-Board side. When check the RD-Board, turn switches to the RD-Board side.

A/V Output signal Switches of RFKZ0214

AUDIO (L) SW AUDIO (R) SW

VIDEO SW

RD-Board side

M8-Board side

RD-Board