Panasonic TH-42PX80U Quick start guide

Model : TH
Model : TH- -42PX80U 42PX80U
TH
TH- -50PX80U 50PX80U
Technical Guide
Technical Guide
Plasma
Plasma
(GPH11DU Chassis)
(GPH11DU Chassis)
HD Models
HD Models
Troubleshooting Handbook
Troubleshooting Handbook
Panasonic Technology and Service Company
National Training

This page is purposely left blank.
2

Table of Contents
3
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
<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”.
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5
Connector’s Location (TH-42PX80U)

1. Troubleshooting Shutdown Problems
6
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
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
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
<LED Blinking timing>
7
13 Communication error with IC8001 A Board

LED blinks 1 time
<Trouble Mode and Defective Board>
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
8
Figure 1
Is the power
LED still
blinking?

LED blinks 2 times
<Trouble Mode and Defective Board>
Trouble Mode
15V down SOS
Defective Board (Possibility)
P, A, SC, SS Board (P > A, SC, SS)
SC Board
A Board
No
SS Board
Yes
9
A Board
Yes No
P Board
Is pin 1 or 2 of the CN P25
shorted to GND?
Yes
Yes
Note: CN = Connector
No
No
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 and Defective Board>
Trouble Mode
3.3V down SOS
Defective Board
A Board
<How to find the defective boards>
Replace the A board
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
10
Note: CN = Connector