Panasonic Viera TH-42PX75U Guida rapida

Model : TH

Model : TH-

-42PX75U

42PX75U

TH-

-50PX75U

50PX75U

TH-

-42PX77U

42PX77U

TH-

-50PX77U

50PX77U

Technical Guide

Plasma

(GPH10DU Chassis)

Troubleshooting Handbook

Panasonic Services Company

National Training

Prepared by

Panasonic Service and Technology Company

National Training

2007 by Panasonic Services Company

violation of law.

Warning

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 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.

Table of Contents

Subject Page

No Picture\No OSD 24

No Sound (TH-42PX600U) 25

Troubleshooting for Picture Problems 27

Diagnostic Method for Troubleshooting PDP

Television 28

Diagnosis by Test Pattern When OSD is Available 29

Diagnosis by Removing the D5 Connector 30

Troubleshooting for Picture Trouble 31

Diagnosis for Picture Problem (All Over the Screen) 32~35

Diagnosis of Vertical Line Problem 36

Picture Trouble at Upper or Lower half 37

Picture Trouble at Right or Left half (50 Inch) 38

Picture Trouble at Right or Left half (42/37 Inch) 39

Picture Trouble in 50 Inch Models 40

Picture Trouble all Over the Screen 41

Examples of Symptoms and Remedies 42~48

Reset and Self-check Procedure 49

Driver Setup Adjustment 51~52

Board Layout and Part Numbers 53~56

Subject Page

Troubleshooting Shutdown Problems 5

Power LED’s Response to Shutdown Operation 6

LED blinks 1 time 7

LED blinks 2 times 8

LED blinks 3 times 9

LED blinks 4 times 10

LED blinks 5 times (Quick Troubleshooting) 11

LED blinks 5 times 12

LED blinks 6 times 13-14

LED blinks 7 times 15

LED blinks 8 times 16

LED blinks 9 times 17

LED blinks 10 times before pressing the power button 18

LED blinks 10 times after pressing the power button 19

LED blinks 12 times 20

Dead part I 21

Dead part II 22

No Picture from one or all inputs (OSD and Sound OK) 23

Introduction

1. Basic concept of how to determine the defective board

1) Verification of voltages

Normally, when there is a power problem, shutdown occurs immediately.

So, to resolve a power problem, voltage checks are necessary before shutdown.

2) Check if the power comes up after disconnecting the suspected board.

If power comes up (*) after disconnecting a board, the

board is defective.

(*) “Power comes up”

equals “no shutdown”.

2. Troubleshooting Video and Audio problems

3. Examples of video problems

4. Adjustment after PCB exchange

1) After exchanging the following boards, voltage adjustment is required.

P board, SC board, SS board => Please refer to the “Service Manual”.

Troubleshooting Shutdown Problems

Power LED’s Response to Shutdown Operation

Once

3.0sec (interval) Light

No Light

LED

Blinking

times Contents Check Point

15V line abnormality

3.3V line abnormality

Power Supply abnormality

5V line abnormality

Scan Driver (1)

abnormality/DRV_RST

Sustain Driver abnormality

STB5V sense time out

Panel Status abnormality

Scan Driver (2) abnormality

Voltage for sound abnormality

REG. voltage abnormality

D Board (15V SOS)

D Board (3.3V SOS)

P Board (Power SOS)

D Board (5V SOS)

SC,SU,SD Board (SC Energy recovery circuit)

C and D Boards Connections

SS Board (SS Energy recovery circuit)/Panel

A Board

D Board (Panel Status DET)

SC,SU,SD Board (SC Floating voltage area)

A Board (Sound SOS), C boards connections

A Board (A SOS, Tuner SOS)/SC/SS

LED blinks 1 time

Trouble Mode

Communication Error

Defective Board

A Board

The A board is defective.

To confirm this, unplug

the TV and disconnect

connectors A5, A6, and

A7 from the A board.

The TV should turn on

automatically and display

a white screen.

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

Note: CN = Connector

A5, A6, and A7

location

LED blinks 2 times

Trouble Mode

15V down SOS

Defective Board (Possibility)

P, D, A, SC, SS Board (P > A, D, SC, SS)

SC Board

D Board

Turn the unit on.

Does the power LED

stay on?

Unplug the TV, reconnect CN A5, A6, and A7 and

disconnect CN SC20 and SC2. To isolate the SC

board.

Unplug the TV, reconnect SC20 and SC2 and disconnect CN P12,

SS11, and SS23 (*1) to isolate the SS board. Remove the jumper at

CN SS34 and install it across pin 8 and 10 of connector P12.

SS Board

Turn the unit on.

Does the power LED

stay on?

Yes

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

(*1) = The reference number of

the sustain data connector is

different in some of the models:

TH-42PX75U = SS23

TH-42PX77U = SS23

TH-50PX75U = SS33

TH-50PX77U = SS33

Unplug the TV,

Reconnect CN P12, SS11,

And SS23 (*1). Turn the unit on.

Is there 15V output at

CN P25 pin 1 or 2

before the TV

shuts down ?

D Board

Yes

P Board

Unplug the TV.

Disconnect CN P25. Is pin 1

or 2 of the CN P25 shorted to

GND?

Yes

Disconnect CN A5, A6,

and A7 on the A board. Does

the TV turn on by itself with

a white screen? A Board

Yes

Note: CN = Connector

LED blinks 3 times

Trouble Mode

3.3V down SOS

Defective Board

D Board

The D board is defective.

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

Note: CN = Connector

LED blinks 4 times

Trouble Mode

Power Supply SOS

Defective Board

Primarily P board or possible D board

Board

Turn the unit on.

Is pin 12 of CN P25 of

the P board high

before shutdown?

P Board

Yes

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

Note: CN = Connector

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