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”.
4

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

LED blinks 4 times (TH-42PX80U)
<Trouble Mode and Defective Board>
Trouble Mode
Power Supply SOS
Defective Board
Primarily P board or possible A board
<How to find the defective boards>
Yes No
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
11
Note: CN = Connector
A BoardP Board
Turn the TV on.
Is pin
12 of CN P25
on the P
board high
before the TV
shuts down?

LED blinks 5 times (Quick Troubleshooting)
<Trouble Mode and Defective Board>
Trouble Mode
5V SOS
Defective Board
P, C, SC, SS board or Panel (DDIC)*1
<How to find the defective boards>
Disconnect CN P12 of the power supply board.
Measure the resistance of pin 1 of the lead
cable to ground.
Yes
12
Proceed to more extensive troubleshooting
of the slides that follow.
No
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.
Is there a
short to
ground?
Panel

LED blinks 5 times (TH-42PX80U)
Trouble Mode
5V SOS
Defective Board
P, C, SC, SS board or Panel
No
No
Yes No Yes No
A Board
Yes No
C1 Board Panel
Yes No
Yes No
C2 Board Panel
SS Board Yes
SC Board
P Board
Yes
No
P Board
13
Yes
Note: CN = Connector
Disconnect CN SC20 on the SC
board. Plug in the TV and turn it on
Does the
power
LED stay
on?
Does the
power
LED stay
on?
Connect
CN SC20. Disconnect
CN SS23 (*1) on the
SS board. Plug in the
TV and turn it on
Connect SS23 (*1).
Disconnect CN 31and A32 on the A
board. With the TV disconnected
measure continuity between pin 5 of CN
P25 and GND
Is pin 5 of
CN P25
shorted
to GND?
Connect A31
and leave A32
disconnected.
Is pin 5 of
CN P25
shorted
to GND?
Disconnect
CN P25.
Is pin 5 of
the socket
P25 shorted
to GND?
Disconnect
CB1-CB4.
Is pin 5 of
CN P25
shorted
to GND?
Disconnect
A31 and
connect A32. Is pin 5 of
CN P25
shorted
to GND?
Disconnect
CB5~CCB8
Is pin 5 of
CN P25
shorted
to GND?
Connect
SC20 and
disconnect
CN SC46.
Does the
power
LED stay
on?
SD Board
(See SD
board
Isolation
procedure
on slide
15)
Yes No

LED blinks 6 times
Trouble Mode
SC Energy Recovery SOS
Defective Board (Possibility)
SC, A, P Board (SC >A> P )
Yes No
14
No
Note: CN = Connector
Clean and reseat the ribbon
cables between the A and the C
boards. Also reseat the cables
between the C boards. If
problem persists, replace the A
board
Yes
Does the
TV power
up and
stay on?
Disconnect
connectors SC2, and SC20
from the SC board. Plug in
the TV and turn it on.
Connect SC2 (*2) and
SC20. Plug in the TV
and turn it on.
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.
(*3) VSUS about 180V (Accurate voltage is provided
on the Panel Label)
(*4) Place a jumper across pin 8 and 10 of connector
P12. The unit will not enter the standby mode without
the jumper.
Does the P
board output
15V at pin 1 of
P7 and Vsus at
pin 1 of CN P2
before the TV
shuts down?
P Board
SC Board

SU/SD Board Isolation Procedure
Procedure to isolate the SU/SD board
For SU board: Disconnect connectors SC41/SU41, SU11/SD11.
For SD board: Disconnect connectors SC42/SD42, SC46/SD46, and
SU11/SD11.
Isolating the SU/SD board does not require the removal of its mounting
screws.
Place a jumper between “VF Ground” (labeled H.V. DANGER) on the SU
board or SD board and coil L801 on the SC board, see figure 2 and 3.
The jumper can be connected to the floating ground screws on the SU
board, which are located above and below connector SU41, see figure 2.
Caution: Before turning the unit on, confirm that the jumper is not
connected to a chassis ground screw, as this will cause severe damage
to the unit. Confirm proper connection by measuring continuity
between floating ground and chassis ground. The resistance should be
in the kilo-ohms range.
15
Figure 2 Figure 3
Unlike previous models of Panasonic Plasma TVs, the 2008 models are designed not to turn-on if either of the SU and
SD boards is disconnected. Disconnecting either causes the unit to shutdown and the power LED to blink 7 times.

Yes
Yes
No
Replace the SU
board.
YesNo
YesNo
Replace the SD, and SU
board.
Replace the SD board.
Replace the SC board.
No
Replace the A board.
Reconnect the SD board only.
(See instructions on slide 15).
Plug in the TV and turn it on.
Physically disconnect the SU board and the
SD board. (See instructions on slide 15).
Plug in the TV and turn it on.
With the SU board and the SD board
still disconnected, remove connectors
SC2 and SC20 from the SC board
Plug in the TV and turn it on.
Disconnect the SD board and
reconnect the SU board. (See
instructions on slide 15). Plug
in the TV and turn it on.
Does the
TV shut down
and the power
LED
blink 7 times?
Does the
TV shut down
and the power
LED
blink 7 times?
Does the
TV shut down
and the power
LED
blink 7 times?
Does the
TV shut down
and the power
LED
blink 7 times?
16
LED blinks 7 times (TH-42PX80U)
Trouble Mode
SC Floating voltage SOS
Defective Board (possibility)
SC, SU, SD, P board (SC,SU,SD>P)
Make sure the connectors P2/SC2, SC20/D20
are not loose and are seated properly.

LED blinks 8 times
Trouble Mode
SS Energy recovery SOS/Panel
Defective Board (possibility)
SS, A board (SS>,A)/PDP
P Board
No No
Yes
17
Panel
Yes No
Disconnect
CN SS23 from the SS
board. Plug in the TV
and turn it on
Does the
TV power
up and
stay on?
Is the anode
of D280 on
the SS board
high?
Figure 4
A Board
SS Board

LED blinks 9 times
<Trouble Mode and Defective Board>
Trouble Mode
Panel Status
Defective Board
D Board
<How to find the defective boards>
Replace the A board.
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
18

The power LED blinks 10 times at plug-in (TH-42PX80U)
Is
there 3.2V at
pin 6 of connector P7 when the
TV is plugged into
the AC line?
Reconnect
A1 and disconnect
connector A51on the A board.
Do the AC relays click after
the TV is plugged into
the AC line?
If cable between connectors K1
and A1 is OK, Replace the K board.
NO
NO
NO Yes
Yes
Yes
Replace
The P board
Disconnect
connector A1 on the A board.
Do the AC relays click after
the TV is plugged into
the AC line?
Replace
The A board
If cable between connectors GS52 and
A51 is OK, Replace the GS board.
19
Trouble Mode
Dead/No power
Defective Board (Possibility)
P, A, GS, K
Do the AC relays
click after the TV is plugged
into the AC line?
NO
Warning: Disconnect AC
Power prior to making any
disconnection or connection.
Go to the
Next slide
Yes
NOTE: When taking voltage reading, place your meter’s probe on the
test point or pin indicated before connecting the TV to the AC line. The
voltage you intent to measure may only appear for a brief moment.

The power LED blinks 10 times at plug-in (TH-42PX80U)
Warning: Disconnect AC
Power prior to making any
disconnection or connection.
Yes
Is there 15V at pin 7
of connector P6/A7 when the TV
is plugged into the
AC line?
Continue from the
previous slide
Is
there 15V at
pin 7 of connector P6/A7 when
the TV is plugged into
the AC line?
No
Yes
Does the power LED still
blink 10 times?
Replace
the K board.
No
No
Yes
Yes
Does the TV shut down?
Replace
The A board
Replace the
GS board. Replace The A board
NOTE: When taking voltage reading, place your meter’s probe
on the test point or pin indicated before connecting the TV to the
AC line. The voltage you intent to measure may only appear for
a brief moment.
20
Disconnect
connector P6 on
the P board. Plug
in the TV
No
Replace
The P board
Disconnect
connector A1 on
the A board.
Plug in the TV
Reconnect
connector A1 and
disconnect connector
A51on the A board.
Plug in the TV