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Panasonic_2005_PDP_TH-42PHD5_TH-50PHD5_TH-42PHW5_TH50PHW5_chassis_GPHD5_[TM]


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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.
                                                                                    



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