Panasonic Viera Link TH-42PZ80U Quick start guide

Model : TH-42PZ80U

TH-46PZ80U

TH-50PZ80U

TH-42PZ85U

TH-46PZ85U

TH-50PZ85U

TH-42PZ800U

TH-46PZ800U

TH-50PZ800U

TH-46PZ850U

TH-50PZ850U

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 Sound 35

Troubleshooting for Picture Problems 38

Diagnostic Method for Troubleshooting PDP

Television 39

Troubleshooting for Picture Trouble 40

Diagnosis for Picture Problem (All Over the Screen) 42

Diagnosis of Vertical Line Problem 43

Picture Trouble at Upper or Lower half 44

Picture Trouble at Right or Left half (50 Inch) 45

Picture Trouble at Right or Left half (42/37 Inch) 46

Picture Trouble in 50 Inch Models 47

Picture Trouble all Over the Screen 48

Examples of Symptoms and Remedies 50

Self-check Procedure 56

Reset 56

Driver Setup Adjustment 57

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 9-11

LED blinks 3 times 12

LED blinks 4 times 13

LED blinks 5 times (Quick Troubleshooting) 14

LED blinks 5 times 15 - 18

LED blinks 6 times 19

SU/SD Board Isolation Procedure 20

LED blinks 7 times 21

LED blinks 8 times 23

LED blinks 9 times 24

LED blinks 10 times before pressing the power button 25 - 27

LED blinks 10 times after pressing the power button 28 - 29

LED blinks 11 times 30

LED blinks 12 times 31

LED blinks 13 times 32

No Power / Dead 33 - 34

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-42PZ85U)

Figure 1

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

Number of blinks Contents Check point

1 Communication Error with

Microcomputer

D, A

2 15V SOS D

3 3.3V SOS D

4 Power Supply SOS P

5 5V SOS D

6 SC Energy recovery SOS

SC, D, P

7 SC floating voltage SOS

SC, SU, SD, D, P

8 SS Energy recovery SOS

SS, D, P

9 Panel Configuration SOS

10 Sub 5V SOS, Main 3.3V SOS, DTV9V

SOS, Tuner SOS

11 Fan SOS PB, A

12 Sound SOS A

13 Communication Error with Peaks

Lite-2

LED blinks 1 time

Trouble Mode

Communication Error

Defective Board

D, GS, A

Disconnect A52 on the A

Board (See Figure 1). Plug

in the TV and turn it on

Replace the GS

board

No Yes

Figure 2

Is the power

LED still

blinking?

Unplug the TV and disconnect

connectors P6 and P7 on the P Board

(See Figure 1). Plug in the TV.

Is the TV turning on by

itself with the following

conditions?

Power LED = Off

SC LED= On

SS LED = ON

Replace the D

board Replace the A

board

No Yes

Warning: Disconnect AC Power prior to

making any disconnection or connection

TH-42PZ80/85/800U

TH-46PZ80/85/800U

TH-50PZ80/85/800U

TH-46PZ850U

TH-50PZ850U

Disconnect A9 on the A

Board. Plug in the TV

and turn it on

A board Connectors Location

LED blinks 2 times

Trouble Mode

15V down SOS

Defective Board (Possibility)

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

2 Blinks Condition can be caused by:

• Missing P15V

• A short of the P15V

• Wrong diagnostic by the D board

Figure 3

P15V Distribution

LED blinks 2 times

Trouble Mode

15V down SOS

Defective Board (Possibility)

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

No Yes

Reconnect P25 and measure the

resistance between pin 1 of

connector P7 and ground (Chassis)

Is there a

short

circuit?

Unplug the TV and check the resistance between

pin 1 of connector P7 and ground (Chassis)

Is there a

short

circuit?

YesNo

Plug in the TV and turn it on. Measure

the voltage at pin 1 of connector P7

Is there

15V

present?

No Yes

Replace

The P board Replace

The D board

Unplug connectors P6, P7, P12, and P25 on the P

board. Measure the resistance between pin 1 of

connector P7 and ground (Chassis)

Is there a

short

circuit?

No Yes

Replace

The P board

Reconnect P12 and measure the

resistance between pin 1 of

connector P7 and ground (Chassis)

Is there a

short

circuit?

No Yes

Replace

The SS board

Disconnect SC20 on the SC board

and measure the resistance between

pin 1 of connector P7 and ground

(Chassis Go to the

Next slide (B)

Go to the

Next slide (A)

Warning: Disconnect AC Power prior to

making any disconnection or connection

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