Panasonic Viera TH-42PX75U Quick start guide

Model : TH
Model : TH- -42PX75U 42PX75U
TH
TH- -50PX75U 50PX75U
TH
TH- -42PX77U 42PX77U
TH
TH- -50PX77U 50PX77U
Technical Guide
Technical Guide
Plasma
Plasma
(GPH10DU Chassis)
(GPH10DU Chassis)
Troubleshooting Handbook
Troubleshooting Handbook
Panasonic Services Company
National Training

Prepared by
Panasonic Service and Technology Company
National Training
Copyright © 2007 by Panasonic Services Company
All rights reserved. Unauthorized copying and distribution is a 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
3
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
<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”.
4

Troubleshooting Shutdown Problems
5

Power LED’s Response to Shutdown Operation
Once
3.0sec (interval) Light
No Light
LED
Blinking
times Contents Check Point
2
3
4
5
6
8
<Check point>
1
9
7
12
10
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 Blinking timing>
6

LED blinks 1 time
<Trouble Mode and Defective Board>
Trouble Mode
Communication Error
Defective Board
A Board
<How to find the defective boards>
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.
7
Note: CN = Connector
A5, A6, and A7
location

LED blinks 2 times
<Trouble Mode and Defective Board>
Trouble Mode
15V down SOS
Defective Board (Possibility)
P, D, A, SC, SS Board (P > A, D, SC, SS)
<How to find the defective boards>
SC Board
D Board
No
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
No
Turn the unit on.
Does the power LED
stay on?
Yes
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
8
(*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
No
P Board
Unplug the TV.
Disconnect CN P25. Is pin 1
or 2 of the CN P25 shorted to
GND?
Yes
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
No
Note: CN = Connector
No

LED blinks 3 times
<Trouble Mode and Defective Board>
Trouble Mode
3.3V down SOS
Defective Board
D Board
<How to find the defective boards>
The D board is defective.
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
9
Note: CN = Connector

LED blinks 4 times
<Trouble Mode and Defective Board>
Trouble Mode
Power Supply SOS
Defective Board
Primarily P board or possible D board
<How to find the defective boards>
D Board
Turn the unit on.
Is pin 12 of CN P25 of
the P board high
before shutdown?
P Board
Yes
No
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
10
Note: CN = Connector