Panasonic TX-32A300, TX-39A300, TX-50A300, TX-32AW304, TX-39AW304 Service Manual

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Service Manual

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ORDER No. MQM1505001V8

There are special components used in this equipment which are important for safety. These parts are marked in the Schematic Diagrams, Circuit Board Diagrams, Explorer 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

IMPORTANT SAFETY NOTICE

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not

Warning

LCD Television

TX-32A300 TX-39A300

TX-50A300 TX-32AW304 TX-39AW304 TX-50AW304

MB95M Chassis

contain warnings or cautions to advise non-technical individuals of potencial dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products deal within this service information by anyone else could result in serious injury or death.

modify the original design without permission of manufacturer.

CONTENTS

SAFETY PRECAUTIONS ........................................... 2

GENERAL GUIDE LINES ...................................... 2

TOUCH – CURRENT CHECK ............................... 2

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

DEVICES .................................................................... 3

ABOUT LEAD FREE SOLDER (PBF) ......................... 4

SERVICE NAVIGATION ............................................. 5

SERVICE HINTS......................................................... 7

SERVICE MODE FUNCTION ..................................... 8

SOFTWARE UPDATE .............................................. 9

HOTEL MODE .......................................................... 10

TROUBLESHOOTING……………………………... …13 PARTS LOCATION…………………………………….21

LOCATION OF LEAD WIRING ................................ 22

BLOCK DIAGRAM .................................................... 25

EXPLODED VIEW .................................................... 26

Safety Precautions

Fig. 2

TO APPLIANCES EXPOSED METAL PARTS

Resistance values in ohms ()

R0=500

RS=1500

CS=0.22F

10k

0.022F

COLD WATER PIPE (EARTH GROUND)

V: Voltmeter or oscilloscope (r.m.s. or peak reading)

Measuring network for TOUCH CURRENTS

Input resistance: 1M Input capacitance:200pF Frequency range: 15Hz to 1MHz and d.c.respectively

NOTE – Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms U2 (V)

U1 (V)

General Guide Lines

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 touch current checks to prevent the customer from being exposed to shock hazards.

Touch-Current Check

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Fig. 2.

3. Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.

4. Check each exposed metallic part, and measure the voltage at each point.

5. Reserve the AC plug in the AC outlet and repeat each of the above measure.

6. The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2, does not exceed the following values: For a. c.: U1 = 35 V (peak) and U2 = 0.35 V (peak); For d. c.: U1 = 1.0 V,

Note:

The limit value of U2 = 0.35 V (peak) for a. c. and U1 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and

2.0 mA d. c. The limit value U1 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.

7. In case a measurement is out 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.

Prevention of Electrostatic Discharge (ESD) to Electrostatically

There are special components used in this equipment which are important for safety. These parts are marked by in schematic diagrams, 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.

IMPORTANT SAFETY NOTICE

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 electrostatic 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 aluminum foil, to prevent electrostatic charge build up 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.

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).

About lead free solder (PbF)

Fig.3

Fig.4

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 Copper (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 Fig.3)

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. (see Fig.4)

Service Navigation

Name

Function

Position

Main-Board

AV Terminal, HDMI, USB, TUNER DVB-A/T/C,

CI-Slot, Headphones, Speaker out,

P-Board

Main Input, Power Supply, Back Light

LED-Board

Remote Receiver

Panel

LCD-Panel / Backlight

Speaker

LVDS Cable

(1) Main-BOARD

(3) LED-BOARD

(2) P-BOARD

(4) Panel

(5) Speaker

(6) LVDS Cable

Name

Function

Position

Main-Board

AV Terminal, HDMI, USB, TUNER DVB-A/T/C,

CI-Slot, Headphones, Speaker out,

P-Board

Main Input, Power Supply, Back Light

LED-Board

Remote Receiver

Panel

LCD-Panel / Backlight

Speaker

LVDS Cable

(2) Main-BOARD

(3) LED-BOARD

(2) P-BOARD

(4) Panel

(5) Speaker

(7) LVDS Cable

39 inch Models

32 inch Models

Chassis Board Layout

Name

Function

Position

Main-Board

AV Terminal, HDMI, USB, TUNER DVB-A/T/C,

CI-Slot, Headphones, Speaker out,

P-Board

Main Input, Power Supply, Back Light

LED-Board

Remote Receiver

Panel

LCD-Panel / Backlight

Speaker

LVDS Cable

50 inch Models

(3) Main-BOARD

(3) LED-BOARD

(2) P-BOARD

(4) Panel

(5) Speaker

(8) LVDS Cable

Spareparts Identification

In order to properly identify correct Parts Order No. for each unit, it is required to respect not only the Model number, but also the so called Product Code. Both information can be obtained from rating label on the rear cover of the unit. In the below example the key information would be:

Model TX-32AW304

Product Code 10089032 (first 8 digits of upper code)

Then login to PanaNet and download concerned parts list. Model No. and Production Code are part of the file name.

Service Hints

Fig.7

Fig.6

(1)

Fig.5

(1)

(2) (2)

(3)

(2)

(2) (2)

(2)

How to remove the backcover

Lay the main unit face down. (see Fig.5)

Remove the 4 fixing screws and the pedestal assembly. (see Fig.6)

Remove the 14 fixing screws and the back cover. (see Fig.7)

Service Menu

You can see the service menu main screen below. You can check SW releases by using this menu. Some Video settings can be done.

How to enter into Service Menu

First press [MENU] button on the remote control, then type “4725” and the Service Main Menu will appear.

How to exit

To return from Service Menu simply press [EXIT] on remote control.

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