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Technical Guide
Plasma
(GPH11DU Chassis)
HD Models
Troubleshooting Handbook
Model : TH-42PZ80U
TH-46PZ80U
TH-50PZ80U
TH-42PZ85U
TH-46PZ85U
TH-50PZ85U
TH-42PZ800U
TH-46PZ800U
TH-50PZ800U
TH-46PZ850U
TH-50PZ850U
Panasonic Technology and Service Company
National Training
This page is purposely left blank.
2
Table of Contents
Subject Page Subject Page
Connector's Location (TH-42PX80U) 5
Power LED's Response to Shutdown Operation 7 No Sound 35
LED blinks 1 time 8 Troubleshooting for Picture Problems 38
LED blinks 2 times 9-11 Diagnostic Method for Troubleshooting PDP 39
Television
LED blinks 3 times 12
Troubleshooting for Picture Trouble 40
LED blinks 4 times 13
Diagnosis for Picture Problem (All Over the Screen) 42
LED blinks 5 times (Quick Troubleshooting) 14
Diagnosis of Vertical Line Problem 43
LED blinks 5 times 15 - 18
Picture Trouble at Upper or Lower half 44
LED blinks 6 times 19
Picture Trouble at Right or Left half (50 Inch) 45
SU/SD Board Isolation Procedure 20
Picture Trouble at Right or Left half (42/37 Inch) 46
LED blinks 7 times 21
Picture Trouble in 50 Inch Models 47
LED blinks 8 times 23
Picture Trouble all Over the Screen 48
LED blinks 9 times 24
Examples of Symptoms and Remedies 50
LED blinks 10 times before pressing the power button 25 - 27
Self-check Procedure 56
LED blinks 10 times after pressing the power button 28 - 29
Reset 56
LED blinks 11 times 30
Driver Setup Adjustment 57
LED blinks 12 times 31
LED blinks 13 times 32
No Power / Dead 33 - 34
3
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
Connector's Location (TH-42PZ85U)
Figure 1
5
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.
6
Power LED's Response to Shutdown Operation
Number of blinks Contents Check point
Communication Error with
1 Microcomputer D, A
2 15V SOS D
3 3.3V SOS D
4 Power Supply SOS P
5 5V SOS D
SC Energy recovery SOS SC, D, P
6
SC floating voltage SOS SC, SU, SD, D, P
7
SS Energy recovery SOS SS, D, P
8
Panel Configuration SOS
9 D
Sub 5V SOS, Main 3.3V SOS, DTV9V
10 SOS, Tuner SOS A
11 Fan SOS PB, A
12 Sound SOS A
Communication Error with Peaks
13 Lite-2 A
7
LED blinks 1 time
Warning: Disconnect AC Power prior to
Trouble Mode Defective Board making any disconnection or connection
Communication Error D, GS, A
TH-42PZ80/85/800U
TH-46PZ850U
TH-46PZ80/85/800U
TH-50PZ850U
TH-50PZ80/85/800U A board Connectors Location
Disconnect A52 on the A Disconnect A9 on the A
Board (See Figure 1). Plug Board. Plug in the TV
in the TV and turn it on and turn it on
No Yes
Is the power
LED still
blinking?
Replace the GS
board Unplug the TV and disconnect
connectors P6 and P7 on the P Board
(See Figure 1). Plug in the TV.
Figure 2
Is the TV turning on by
itself with the following
No conditions?
Yes
Power LED = Off
SC LED= On
Replace the D SS LED = ON Replace the A
board board
8
LED blinks 2 times
Trouble Mode Defective Board (Possibility) 2 Blinks Condition can be caused by:
15V down SOS P, A, SC, SS Board (P > A, SC, SS) ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo