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Panasonic Services Company
National Training
TH-42PHD5/TH-50PHD5
TH-42PHW5/TH50PHW5
GPH5D Chassis
Plasma Display Panel
Troubleshooting Guide
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.
Objective...............................................................................................................5
2002 Model Line Up..............................................................................................6
Specifications.....................................................................................................7
Features.............................................................................................................8
New Asymmetrical Cell Structure Panel .........................................................9
Model Differences ...........................................................................................9
Disassembly .......................................................................................................11
Rear Cover Removal .......................................................................................11
42" HD PCB Board Layout Diagram ...................................................................13
Printed Circuit Board Information Table ...........................................................13
50" PCB Board Layout Diagram .........................................................................14
42" SD PCB Layout Diagram ..............................................................................15
Video Signal Path Explanation............................................................................16
HY/HZ Board....................................................................................................16
HX Board .........................................................................................................17
D1 Board..........................................................................................................18
DVI Interface ....................................................................................................19
Sync Process ...................................................................................................21
RGB/PC Input Mode Sync ...............................................................................21
Composite/ Component Video Input mode Sync .............................................21
D1 Board.............................................................................................................22
D1 Main ICs Operation ....................................................................................22
D2 Board.............................................................................................................23
D2 Board details ..............................................................................................24
SC Board Explanation.........................................................................................25
SS Board Explanation.........................................................................................28
Power Supplies ...................................................................................................31
Standby Power Supply.....................................................................................31
Main Power Supply ..........................................................................................32
Power Factor Control ....................................................................................32
Low Voltage Power supply............................................................................33
Voltage Regulation........................................................................................33
High Voltage Power Supply .............................................................................34
Protection Circuits...............................................................................................36
Diagnostic Procedures........................................................................................38
Self Check Display Indication...........................................................................38
Power LED Flashing timing chart.....................................................................39
Diagnostic Flow Charts .......................................................................................40
No Power .........................................................................................................40
The Power LED is red and blinking on/off........................................................41
Power LED blinks twice ...................................................................................42
No Picture Flowchart 1.....................................................................................43
No picture Flowchart 2 .....................................................................................44
Dark picture Flowchart .....................................................................................45
Local screen failure.............................................................................................46
3
Service Hints....................................................................................................46
After Image Prevention .......................................................................................53
Screen Saver Feature...................................................................................53
Side Bar Brightness adjustment....................................................................54
Option Setting .....................................................................................................55
Accessing the Option Menu .............................................................................55
Hidden Option Menu for GPH5D series ...........................................................56
Sample Waveforms.............................................................................................58
HY/HZ board ....................................................................................................58
HX board..........................................................................................................61
SC Board Input Signals....................................................................................63
SC Board Waveforms ......................................................................................64
SS-Board Input Signals....................................................................................66
SS Board Waveforms ......................................................................................67
PDP Defect Pixel Specification ...........................................................................68
Connector Tables................................................................................................69
F-BOARD CONNECTORS ..............................................................................69
P-BOARD CONNECTORS ..............................................................................69
HX- BOARD CONNECTORS...........................................................................73
HY / HZ- BOARD CONNECTORS...................................................................74
Adjustment Procedures.......................................................................................75
Panel label Information ....................................................................................75
+B Set-up.........................................................................................................76
Confirmation.....................................................................................................76
Driver Set-up....................................................................................................77
Initialization Pulse Adjust .................................................................................78
P.C.B. (Printed Circuit Board) exchange procedure.........................................79
Adjustment Volume Locations..........................................................................79
Test Point locations..........................................................................................80
Serviceman mode ...............................................................................................81
CAT (computer aided test) Mode .....................................................................81
I2C Mode ..........................................................................................................81
CD mode..........................................................................................................82
SD Mode..........................................................................................................83
I2C Menu Structure ..........................................................................................84
Alignment Procedures.........................................................................................85
NTSC Panel White Balance.............................................................................85
Pedestal Setting...............................................................................................86
PC/RGB Panel White Balance .........................................................................87
HD /525i /525P Panel White Balance ..............................................................89
625i Panel White Balance................................................................................91
Sub Brightness Setting ....................................................................................92
4
Objective
The information provided in this document is designed to assist the technician in
determining the defective printed circuit board. The troubleshooting flow charts,
signal path charts and connector information should provide enough detail that
the technician can accurately determine which one of the printed circuit boards is
required to repair the product. Alignment and adjustment procedures are also
included in this document.
The Block diagrams and the schematic drawings reference the model TH-
42PHD5, but the technology is consistent with any GPH5D chassis.
5
2002 Model Line Up
HD Plasma Display
HD Panel
Digital Cinema Reality
Advanced 3-dimensional
Progressive Scan
1366 x 768 XGA Resolution
TH-50PHW5 (UXGA Compatible) TH-42PHW5
50-inch (127 cm)
42-inch (106cm)
Wide Plasma Display
Plasma Contrast Automatic
Tracking System (C.A.T.S.)
3-Dimensional Progressive
Scan
VGA Resolution (UXGA
Compatible) TH-37PW5
TH-42PW5 37-inch (94cm)
42-inch (106 cm)
6
Specifications
Our New 50" & 42" HD Progressive Panels
The industry's highest-resolution panels
Panasonic Company PI Company F/H
Scanning Method Progressive Progressive Interlace
50- 1,366 x 768= 1,280 x 768= N/A
inch 1.05 million pixels 0.98 million pixels
Pixel 0.810 (H) x 0.810 (V) 0.858 (H) x 0.808 (V)
pitch = 0.656 = 0.693
42/43- (42" Screen size) (43" Screen size) 1,024 x 5120.52
inch 1,024 x 768= 1,024 x 768= million pixels
0.79 million pixels 0.79 million pixels
Pixel 0.898 (H) x 0.674 (V) 0.930 (H) x 0.698 (V)
0.90 (H) x 1.02 (V)=
pitch = 0.605 = 0.649 0.918 / 2= 0.459
[1frame]
Relationship between Picture resolution and Scanning method: 768p > 720p >
680p = 1080i > 1024i
7
Features
Pixel explanation
SD (Standard Definition) Panel
852 pixels
410,000 Pixels 480 pixels
Provides the optimum number of pixels for viewing
standard broadcasts and DVD.
HD (High-Definition) panel
1,024 pixels
768 pixels
790,000 pixels
Reproduces even the tiniest details of high-definition
sources and other high-quality images.
Figure 1
8
Scan Explanation
Panasonic progressive scan ALIS system Interlace scan
Figure 2
The 1-field (1/60 sec) display pixels on the Panasonic 42" and 37" SD models
and on the ALIS system models are VGA level. (Panasonic HD models are XGA
level, for higher resolution.)
A.L.I.S. (Alternate Lighting of Surfaces) method is one of the new panel driving
systems of plasma display developed by Fujitsu Limited. ALIS method is a
system developed from the 3 electrode discharging system.
The ALIS method uses an interlaced driving scheme, which means the even and
odd lines are addressed alternately.