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
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 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
<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-42PZ85U)
Figure 1

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
<LED Blinking timing>
7
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
D
10 Sub 5V SOS, Main 3.3V SOS, DTV9V SOS, Tuner SOS
A
11 Fan SOS PB, A
12 Sound SOS A
13 Communication Error with Peaks Lite-2
A

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
8
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)
9
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)
10
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

11
Continue from the
previous slide (B)
Continue from the
previous slide (A)
Reconnect P6 and measure the
resistance between pin 1 of
connector P7 and ground (Chassis
Is there a
short
circuit?
No Yes
Replace
The A board
Reconnect P7 and measure the
resistance between pin 1 of
connector P7 and ground (Chassis)
Is there a
short
circuit?
No Yes
Replace
The D board
Disconnect PB30 on the PB board
and measure the resistance between
pin 1 of connector P7 and ground
(Chassis)
Is there a
short
circuit?
Replace
The PB board Replace The A board
No Yes
Is there a
short
circuit?
No Yes
Replace
The D board
Replace
The SC board

LED blinks 3 times
Trouble Mode
3.3V down SOS
Defective Board
D Board
Replace the D board
12
Warning: Disconnect AC Power prior to
making any disconnection or connection

LED blinks 4 times
Trouble Mode
Power Supply SOS
Defective Board
Primarily P board followed by D board
Yes No
13
D BoardP Board
Turn the TV on.
Is pin
12 of CN P25
on the P
board high
before the TV
shuts down?
Warning: Disconnect AC Power prior to
making any disconnection or connection
An abnormal increase in any of the voltages generated
by the power supply (Vsus, Vda, P15V, P5V, STB5V)
4 blinks condition can be caused by:

LED blinks 5 times
Trouble Mode
5V SOS
Defective Board
P, D, Cs, SC, SD, SS, D board or Panel
14
Warning: Disconnect AC Power prior to making any
disconnection or connection
5 blinks condition can be caused by:
Figure 4
• Missing P5V
• A short of the P5V
• A short of the Vda line (Note: missing
Vda from the P board does not cause 5
blinks)
• Wrong diagnostic by the D board
P5V and Vda Distribution

LED blinks 5 times (Quick Troubleshooting)
Trouble Mode
5V SOS
Defective Board
P, D, Cs, SC, SS, D board or Panel
Disconnect the TV. Measure the resistance
between pin 1 of connector P12 on the P
board and ground (Chassis).
Yes
15
Proceed to more extensive troubleshooting
of the slides that follow.
No
Warning: Disconnect AC Power prior to making any
disconnection or connection
Is there a
short to
ground?
Panel
Note: Even though it
does not happen often,
the 5 blinks shutdown
can also be caused by
one of the C boards

LED blinks 5 times
Trouble Mode
5V SOS
Defective Board
P, C, SC, SS,SD, D board or Panel
16
Disconnect the TV and measure the
resistance between pin 5 of connector P25 on
the P board and ground (Chassis).
Yes No
Is there a
short to
ground?
Use a volt-meter and place the positive probe on pin 5 of connector P25 on the P board
while the negative probe is grounded. Plug in the TV and turn it on
Is
there
5V?
Yes No
Replace
the D board
Replace
the P board
Disconnect P25 on the P board. Measure the
resistance between pin 5 of connector P25 on
the P board and ground (Chassis).
Yes No
Is there a
short to
ground?
Replace
the P board
Reconnect P25 and disconnect SC20 on
the SC board. Measure the resistance
between pin 5 of connector P25 on the P
board and ground (Chassis). Yes No
Is there a
short to
ground?
Replace
the SC board
Reconnect SC20 and disconnect SS33 on the SS board.
Measure the resistance between pin 5 of connector P25 on
the P board and ground (Chassis). Disconnect SC46 and reconnect
SC20 on the SC board. Measure
the resistance between pin 5 of
connector P25 on the P board and
ground Chassis).
Yes No
Is there a
short to
ground?
Replace
the SD board
Go to the
next slide (A)
Yes No
Is there a
short to
ground?
Replace
the SS board
Warning: Disconnect AC Power prior to making any
disconnection or connection

LED blinks 5 times
17
Continue from the
previous slide (A)
Reconnect SS33 and disconnect D31, D32, and D33 on the
D board (To get to this connectors, remove the A Board
Block Assembly). Measure the resistance between pin 5 of
connector P25 on the P board and ground (Chassis).
Yes No
Is there a
short to
ground?
Replace
the D board
Reconnect D31 and D32 only. Measure the resistance
between pin 5 of connector P25 on the P board and
ground (Chassis).
Yes No
Is there a
short to
ground?
Disconnect the Flex cables between the panel and the C1
board (CB1~CB8). Measure the resistance between pin 5
of connector P25 on the P board and ground (Chassis).
Yes No
Is there a
short to
ground?
Reconnect D33 and disconnect the Flex cables between
the panel and the C2 board (CB9~CB15). Measure the
resistance between pin 5 of connector P25 on the P
board and ground (Chassis).
Replace
the C1 board Replace the Panel
Yes
No Is there a
short to
ground?
Replace
the C2 board
TH-42PZ80/85U TH-46PZ80/85U
TH-50PZ80/85U
TH-46PZ800/850U
TH-50PZ800/850U
Go to the
next slide (B)
TH-42PZ85U
Figure 5

LED blinks 5 times
18
Continue from the
previous slide (B)
Reconnect D31 only. Measure the resistance between pin
5 of connector P25 on the P board and ground (Chassis).
Yes No
Is there a
short to
ground?
Disconnect the Flex
cables between the
panel and the C1 board
(CB1~CB6). Measure
the resistance between
pin 5 of connector P25
on the P board and
ground (Chassis).
Yes No
Is there a
short to
ground?
Reconnect D32 and D33 and disconnect C26 on the C2
board. Also disconnect the Flex cables between the panel
and the C2 board (CB7~CB11). Measure the resistance
between pin 5 of connector P25 on the P board and
ground (Chassis).
Replace
the C1 board Replace
the Panel
Yes No
Is there a
short to
ground?
Replace
the C2 board
Reconnect C26 and the Flex-cables between the panel
and the C2 board. Disconnect the Flex cables between
the panel and the C3 board (CB12~CB15). Measure the
resistance between pin 5 of connector P25 on the P
board and ground (Chassis).
Yes No
Is there a
short to
ground?
Replace
the C3 board Replace the Panel

LED blinks 6 times
Trouble Mode
SC Energy Recovery SOS
Defective Board (Possibility)
SC, P Board (SC >D> P )
Yes No
19
No
Clean and reseat the ribbon
cables between the D and the C
boards. Also reseat the cables
between the C boards. If
problem persists, replace the D
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
(*2) CAUTION: Before connecting P2/SC2 or
P11/SS11, discharge is necessary to prevent
potential shock caused by VSUS.
Does the P
board output
15V at pin 1 of
P7 and Vsus at
pin 1 of CN P2
before the TV
shuts down?
Replace
the SC board
Replace
the P 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 6 and 7.
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.
20
Figure 6 Figure 7
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.