Panasonic TH-42PX80U Guida rapida

Model : TH

Model : TH-

-42PX80U

42PX80U

TH-

-50PX80U

50PX80U

Technical Guide

Plasma

(GPH11DU Chassis)

HD Models

Troubleshooting Handbook

Panasonic Technology and Service Company

National Training

This page is purposely left blank.

Table of Contents

Subject Page

No Picture\No OSD 28

No Sound 29

Troubleshooting for Picture Problems 31

Diagnostic Method for Troubleshooting PDP

Television 32

Troubleshooting for Picture Trouble 33

Diagnosis for Picture Problem (All Over the Screen) 34~36

Diagnosis of Vertical Line Problem 37

Picture Trouble at Upper or Lower half 38

Picture Trouble at Right or Left half (50 Inch) 39

Picture Trouble at Right or Left half (42/37 Inch) 40

Picture Trouble in 50 Inch Models 41

Picture Trouble all Over the Screen 42

Examples of Symptoms and Remedies 44~49

Self-check Procedure 50

Reset 51

Driver Setup Adjustment 52~53

Subject Page

Connector’s Location (TH-42PX80U) 5

Power LED’s Response to Shutdown Operation 7

LED blinks 1 time 8

LED blinks 2 times 9

LED blinks 3 times 10

LED blinks 4 times 11

LED blinks 5 times (Quick Troubleshooting) 12

LED blinks 5 times 13

LED blinks 6 times 14

SU/SD Board Isolation Procedure 15

LED blinks 7 times 16

LED blinks 8 times 17

LED blinks 9 times 18

LED blinks 10 times before pressing the power button 19-20

LED blinks 10 times after pressing the power button 21-22

LED blinks 12 times 23

LED blinks 13 times 24

Dead part I 25-26

No Picture from one or all inputs (OSD and Sound OK) 27

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 board under suspicion.

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”.

Connector’s Location (TH-42PX80U)

1. Troubleshooting Shutdown Problems

CAUTION: Some steps requires removal of connectors and

sometimes PC boards removal. Do not let the TV run for more

than 30 seconds while connectors or boards are disconnected.

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

A Board (15V SOS)

A Board (3.3V SOS)

P Board (Power SOS)

A Board (5V SOS)

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

C and A Boards Connections

SS Board (SS Energy recovery circuit)/Panel

A Board

A 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

13 Communication error with IC8001 A Board

LED blinks 1 time

Trouble Mode

Communication Error

Defective Board

A, GS

Disconnect GS52 on the SD Card Slot Board (GS board )

(See Figure 1). Plug in the TV and turn it on

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

Replace the GS

board

No Yes

Replace the A

board

Figure 1

Is the power

LED still

blinking?

LED blinks 2 times

Trouble Mode

15V down SOS

Defective Board (Possibility)

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

SC Board

A Board

SS Board

Yes

A Board

Yes No

P Board

Is pin 1 or 2 of the CN P25

shorted to GND?

Yes

Note: CN = Connector

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-42PX80U = SS23

TH-50PX80U = SS23

(*2) CAUTION: Before connecting P2/SC2 or

P11/SS11, discharge is necessary to prevent

potential shock caused by VSUS.

Unplug the TV,

Re-connect CN

P12, SS11, SS34,

and SS23 (*1).

Turn the TV on.

Is there

15V output

at CN P25

pin 1 or 2

before the

TV shuts

down ?

Unplug the TV.

Disconnect CN P25.

Unplug the TV and disconnect CN SC20 and SC2.

To isolate the SC board. Re-connect the TV and

turn the power on.

Unplug the TV, reconnect SC20 and (*2)

SC2 and disconnect CN P12 from the P

board and SS11 and SS23 (*1) from the

SS board to isolate the SS board.

Remove the jumper at CN SS34 and

install it across pin 8 and 10 of connector

P12. Plug in the TV and turn the power on.

Does the

power

LED stay

on?

Does the

power

LED stay

on?

Is pin 1 or 2

of the CN

P25 shorted

to GND?

LED blinks 3 times

Trouble Mode

3.3V down SOS

Defective Board

A Board

Replace the A board

Warning: Disconnect AC Power prior to

making any disconnection or

connection.

Note: CN = Connector

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