Panasonic TH-42PX80U, TH-50PX80U, TH-42PZ80U, TH-46PZ80U, TH-50PZ80U Service Manual
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11th Generation Full High Definition Plasma Display TV
This Seminar covers the following models: TH-42PX80U, TH-50PX80U, TH-42PZ80U, TH-46PZ80U TH-50PZ80U, TH-42PZ85U, TH-46PZ85U, and TH50PZ85U
Panasonic Technology and Service Company
National Training
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Prepared by
Cesar Perdomo
Panasonic Service and Technology Company
National Training
Copyright © 2008 by Panasonic Service and Technology 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.
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Table Of Contents
Subject |
Page |
Topics |
5 |
Models Line-up (46” PDP TV Introduction for 2008) |
6 |
Models Comparison |
7 |
TH-XXPX80U |
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TH-42PX80U Comparison to Last Year’s Models |
8 |
Connectors Location (TH-42PX80U) |
9 |
Power Supply/Signal Process/Panel Drive Circuit |
10 -11 |
Power Supply (Standby) TH-42PX80U-TH50PX80U |
12 |
Standby Operation |
13 |
Connectors Location on the P board (TH-42PX80U) |
14 |
Power On Operation TH-42PX80U-TH50PX80U |
15 |
Power On Circuit Explanation |
16 |
Voltages Distribution (TH-42PX80U) |
17-18 |
TH-XXPZ80U and TH-XXPZ85U |
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Boards Name and Function (TH-XXPZ80U/PZ85U) |
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Board Layout |
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TH-42PZ85U |
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TH-42PZ85U Connectors Location |
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TH-42PZ85U D Board and C Boards Location |
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Start-up Process |
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Start-up Process Block Diagram |
28 |
Start up Process Description |
29 |
Start up Process Description |
30 |
Start-up Process Explanation |
31 |
Sub-Voltages Distribution Block Diagram |
32 |
Sub-Voltages Distribution Explanation |
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Troubleshooting 10 blinks Condition At Plug in (Schematic) |
34 |
Troubleshooting 10 blinks Condition At Plug in |
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Power On Operation Block Diagram |
37 |
The Power On Circuit Explanation |
38 |
Voltages Distribution |
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Troubleshooting 10 blinks Condition Power On (Schematic) |
40 |
Troubleshooting 10 blinks Condition Power On |
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Circuit Operation When A6 and A7 are Removed |
43 |
Circuit Operation When A6 and A7 are Removed |
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Picture of connector A6 and A7 location |
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Power LED Blinking timing chart |
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D board SOS Detect |
48 |
Subject |
Page |
D board SOS Detect (Explanation) |
49-51 |
2 Blinks Error Code Block Diagram |
52 |
Troubleshooting 2 Blinks Error Code |
53 |
5 Blinks Error Code Block Diagram |
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Troubleshooting 5 Blinks Error Code |
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D16280(D280) Location (8 Blinks) |
56 |
8 Blinks SOS Detect Circuit |
57 |
Sustain Drive Board (SS) Isolation |
58 |
Sustain Drive (SS) Board Isolation (Explanation) |
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SC/SU/SD Board Isolation (Explanation) |
60 |
DRV Reset (6 Blinks) |
61 |
Drive Reset Circuit Explanation |
62 |
SU/SD Board Isolation (Pictorial) |
63 |
SC/SU/SD Board Isolation (Explanation) |
64 |
SC/SU/SD Board Isolation (Block Diagram) |
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Symptoms caused by defective SD boards |
66 |
Symptom Caused By Defective SU Board |
67 |
A board SOS Detect Block Diagram |
68 |
A board SOS Detect (Explanation) |
69 |
Digital Signal Processor Block Diagram (TH-42PZ85U) |
71 |
Digital Signal Processor Explanation (TH-42PZ85U) |
72 |
Switching to 4:3 to confirm problem with the A board |
73 |
D Board (Format Converter/Plasma AI Processor) |
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Circuit Explanation |
75-76 |
Pictures Of symptoms caused by the D board |
77 |
Service Mode |
79 |
Internal Test Patterns |
80 |
Self Check |
81 |
Check Point |
82 |
Self Check Menu |
83 |
How To Reset |
84 |
Data Copy To SD Card |
86-87 |
Data Copy From SD Card to The TV |
88 |
How to Copy Self Check Data To SD Card |
89-90 |
Software Upgrade |
91-94 |
Picture Refresh |
95-96 |
Extension Cable List |
97-98 |
Extension Cable TH-XXPX80U (A Board) (P Board) |
99-102 |
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Topics
Models Line-up (46” PDP TV Introduction for 2008)
HD Models/Full HD Models
Standby Operation
Power-on Operation
Shutdown Detect Circuit
Troubleshooting
Signal Process Circuit
Panel Drive Circuit
Adjustments
Service Notes
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Models Line-up (46” PDP TV Introduction for 2008)
Panasonic has introduced a 46” PDP TV for 2008
2008 Panasonic PDP TV Series (11th Generation)
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42” |
46” |
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50” |
58” |
65” |
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HD |
TH-42PX80U |
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TH-50PX80U |
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(1 P Board) |
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(1 P Board) |
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FHD |
TH-42PZ80U |
TH-46PZ80U |
TH-50PZ80U |
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(1 P Board) |
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(2 P Boards) |
(2 P Boards) |
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FHD |
TH-42PZ85U |
TH-46PZ85U |
TH-50PZ85U |
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(1 P Board) |
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(2 P Boards) |
(2 P Boards) |
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FHD |
TH-42PZ800U |
TH-46PZ800U |
TH-50PZ800U |
TH-58PZ800U |
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(1 P Board) |
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(2 P Boards) |
(2 P Boards) |
(2 P Boards) |
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FHD
TH-46PZ850U TH-50PZ850U TH-58PZ850U TH-65PZ850U
All the new 42” PDP TVs only have 1 “Power Supply” (P) board. |
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The 46”, 50”, and 58” models, with the exception of TH-50PX80U, |
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have 2 “Power Supply” (P) boards. |
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These boards have different part numbers |
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2008 Models Comparison
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HD |
FULL HD |
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TH-42PX80U |
TH-42PZ80U |
TH-42PZ85U |
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Model |
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TH-46PZ80U |
TH-46PZ85U |
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TH-50PX80U |
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TH-50PZ80U |
TH-50PZ85U |
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Resolution |
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1,024 by 768 (42”) |
1,920 by 1,080 |
1,920 by 1,080 |
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1,366 by 768 (50”) |
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PC Input |
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1 |
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D Board |
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Yes |
Yes |
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A Board |
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Yes |
Yes |
Yes |
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Contrast Ratio |
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15,000:1 |
20,000:1 |
30,000:1 |
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Panel Life Expectancy = 100,000 Hrs
Altitude/Elevation Rating = 2800 Meter (9240 feet)
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TH-42PX80U Comparison to Last Year’s Models
The Models TH-42PX80U and TH-50PX80U do not have a D board. The circuits normally found in the D board on previous models, are now built into the A board.
D Board
TH-42PX75U (2007 Model)
No D
Board
TH-42PX80U (2008 Model)
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Connectors Location (TH-42PX80U)
This slide shows the location of the connectors on all the boards |
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Power Supply/Signal Process/Panel Drive Circuit
TH-42PX80U
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Power Supply/Signal Process/Panel Drive Circuit
The PDP TV consists of several circuits.
The Power Supply:
This circuit provides the voltages necessary to drive all the circuits in the TV.
Signal Processing/CPU:
This circuit is designed to perform all the functions necessary to process any input signal.
The CPU provides commands to turn on the TV. It communicates with other components on the TV via the bus line. It also provides protection by monitoring the supply voltages for abnormalities.
Panel Drive Circuit:
This circuit provides the control drive pulses to the drive circuit boards to drive the panel.
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Power Supply (Standby) TH-42PX80U-TH50PX80U
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Standby Operation
When the TV is plugged in:
AC is applied to the standby circuit in the power supply to produce STB12V and STB5V.
The STB12V is routed thru the SS board and it’s returned back to the P board to turn on a switching circuit that outputs the STB5V. If the STB5V is missing, the TV is dead (No power)
The STB5V is output from the P board at pin 5 of connector P7 and it is applied to pin 5 of connector A7 on the A board.
The STB5V is applied to a 3.3V regulator to power the Main CPU (IC1100) on the A board.
When the Main CPU (IC1100) receives 3.3V, it outputs a temporary 2.7V/3.2V command that is provided to pin 6 of connector P7 on the P board. The function of this command is to turn on the circuit that generates the “F+15V” in the P board.
The P board outputs the F+15V to pins 7, 8, and 9 of connector A7 in the A board. This voltage is applied to a regulator circuit that generates: SUB9V, SUB5V, and SUB3.V.
If any of these voltages (F+15V, SUB9V, SUB5V, and SUB3.3V) are missing, the TV shuts down and the power LED blinks 10 times.
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Connectors Location on the P board (TH-42PX80U)
This picture shows the location of the connectors on the P board
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Power On Operation TH-42PX80U-TH50PX80U
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Power On Circuit Explanation
1.The power command from the power switch on the S board or the remote control receiver on the K board is provided to the Main CPU on the A board thru connector A1. The CPU on the A board outputs the “F_STB_ON” Command and the PANEL_STB_ON” command.
2.The “F_STB_ON” command is provided to pin 6 of connector P7 of the power supply to develop the
F_STB+15V.
3.The “PANEL_STB_ON” is used to turn on the STB3.3V regulator on the A board. The output voltage is applied to the “Panel” CPU on the A board (Formerly located in the D board).
4.When the “Panel” CPU on the A board is energized, it outputs the “PANEL_MAIN_ON” Command (3.2V) to pin 11 of connector P25 on the P board.
The PANEL MAIN ON command turns on the power supply circuit that outputs the Vsus, Vda, 15V, and 5V.
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Voltages Distribution (TH-42PX80U)
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Voltages Distribution (TH-42PX80U)
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Because of the similarities between the TH-XXPX80U, the TH-XXPZ80U, and TH-XXPZ85U, from this point forward, the material used in the guide is based on the TH-XXPZ85U.
TH-XXPZ80U and TH-XXPZ85U
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Boards Name and Function (TH-XXPZ80U/PZ85U)
Board Name |
Function |
Board Name |
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Function |
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P |
Power Supply |
D |
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Format Converter, Plasma AI, Sub-Field |
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Processor |
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PB |
Fan control |
C1 |
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Data Driver (Upper Right) |
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A |
Speaker out, Sound Processor AV Terminal, |
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AV Switch |
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C2 |
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Data Driver (Upper Left) |
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DC-DC Converter Digital Signal Processor, |
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Microcomputer HDMI Interface, Peaks Lite 2, |
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Full HD |
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SC |
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Scan Drive |
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G |
Front terminal, AV3, Key Switch |
SU |
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Scan out (Upper) |
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K |
Remote receiver, Power LED |
SD |
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Scan out (Lower) |
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S |
Power Switch |
SS |
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Sustain Drive |
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GS |
SD Card Slot |
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GH |
HDMI3 in |
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Board Layout
Panasonic has been using single scan addressing in our standard definition (SD) Plasma TVs for a while now.
In 2006 (9th generation), Panasonic started using single scan addressing in our 42” HD models.
In 2007 (10th generation), the 50” HD models were added to the list of TV using single scan addressing.
For 2008 (11th generation), the 42” and 50” (Not yet confirmed in 58” and 65”) Full HD models (PZ80, PZ85, and PZ800 (Not yet confirmed in PZ850) were also added to the list.
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TH-42PZ85U
This is a picture of the TV with the rear cover removed |
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TH-42PZ85U Pictorial Boards Layout
In this line of Full HD Plasma TVs, the number of boards used have been reduced.
Both the DG board and the H board are no longer used. The circuits found in these boards are now part
of the A board. |
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TH-42PZ85U Connectors Location
This picture shows the location of all the connectors in the TV. |
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TH-42PZ85U D Board and C Boards Location
This picture shows the location of the D board and its connectors. |
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Start-up Process
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Start-up Process
Upon connecting the Panasonic Plasma Display Television to the AC line, the sound of relays being triggered can be heard from the Power Supply board. Also a red light from the Optical jack on the back of the TV can be observed.
Approximately 15 seconds later, the click sound from the relays can be heard again and the red LED inside the Optical jack turns off.
This condition is normal and by paying attention to this sequence of events, we can confirm the operation of several circuits inside the TV.
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Start-up Process Block Diagram
STB 3.3V
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Start up Process Description
When the TV is plugged in:
AC is applied to the power supply board (P) through connector P9. The AC is applied to the standby circuit to produce STB12V and STB5V.
The STB5V is routed thru the SS board to turn on a circuit which function is to allow the output of the STB5V through connector P7.
The STB5V is output from the P board at pin 5 of connector P7 and it is applied to pin 5 of connector A7 on the A board.
The STB5V is applied to a 3.3V regulator to power the Main CPU (IC1100) on the A board. The 3.3V becomes STB3.3V.
The STB3.3V is applied to the power LED and the remote control receiver in the K board.
When the Main CPU (IC1100) receives 3.3V, it outputs a 2.7V command that is provided to the P board and the SOS Detect circuit within the A board. This command only lasts approximately 15 seconds and it is called “F-STB-ON”. The function of this command is to turn on the circuit that generates the “F-STB-14V” in the P board.
The function of the 2.7V command applied to the SOS Detect circuit in the A board together with the STB5V, is to activate the “SOS DETECT” circuit in the A board.
The F+15V from connector P6 on the P board is applied to connector A6 in the A board. This voltage is applied to a regulator circuit that generates: SUB9V, SUB5V, and SUB3.V.
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Start-up Process (Detailed Circuit)
This is a detailed block diagram of the start up process
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