GP8DU Panel Replacement.pdf
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Technical Guide
Preliminary
Plasma Display Television
GP8DU Chassis
Panel Replacement Procedure
Panasonic Services Company
National Training Center
Prepared by
Jean Magloire
Panasonic Services Company
National Training
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.
Table of Contents
Equipment List: .....................................................................................................1
Panel Handling Precautions..................................................................................1
Preparation of the new Panel................................................................................2
Removal of the Defective Chassis PC Boards ......................................................4
Rear Cabinet Removal ......................................................................................4
Board Description..............................................................................................5
Disassembly and Reassembly Procedure ............................................................5
Removal of the fans ..........................................................................................5
Removal of the metal frame ..............................................................................6
Removal of the power supply board (P board) ..................................................6
Removal of the PB board and metal frame .......................................................7
Removal of the D board ....................................................................................7
Transferring the SU-Board ................................................................................8
Transferring the SD-Board ................................................................................8
Transferring the SC-Board (37, 42inch) ............................................................9
Transferring the SS2-Board ............................................................................10
Transferring the SS3-Board ............................................................................10
Transferring the SS-Board ..............................................................................11
Transferring the AC Inlet .................................................................................12
Installation of the power supply board (P board) .............................................12
Transferring the C1 and C2 Boards flexible ribbon cable assembly ................13
Removal of the C3 and C4 Boards flexible ribbon cable (HD Models Only)....13
Removal of the front cabinet from the plasma display panel ...........................14
Removal of the Panel from the stand ..............................................................16
Removal of the stand brackets ........................................................................16
Installation of the D board ...............................................................................17
Installation of the PB board and metal frame ..................................................17
Installation of the metal frame .........................................................................17
Installation of the front escutcheon..................................................................18
Installation of the fans .....................................................................................20
Lead Dressing.....................................................................................................20
Connector Connection:....................................................................................21
Lead Dressing 2 ..............................................................................................22
Additional Information for 37 and 50-inch Models ...............................................23
Adjustments ........................................................................................................24
Driver Set-up ...................................................................................................24
Initialization Pulse Adjustment.........................................................................25
Drive Waveform ...........................................................................................25
Adjustment Volume Locations .........................................................................26
Test Point Locations........................................................................................27
Serviceman Mode and Adjustment procedure of the new panel .........................28
Serviceman mode (Electronic Controls)..............................................................29
CAT (computer aided test) Mode ....................................................................30
CAT mode menu..........................................................................................30
How to access the CAT Mode .........................................................................30
I
2
C Mode .........................................................................................................31
I
2
C Menu Structure..........................................................................................32
Alignment Procedures.........................................................................................33
Pedestal Setting ..............................................................................................33
NTSC White Balance Adjustment....................................................................34
HD Panel White Balance Adjustment ..............................................................35
Sub Brightness Setting....................................................................................36
Examples of Defective Panels ............................................................................37
Service Contact Information................................................................................40
Objective
This disassembly procedure assists the technician in disassembling a defective
Plasma Display television. It shows a complete service procedure broken down
into three steps:
1. Complete removal of the printed circuit boards and the defective plasma
panel from the chassis assembly.
2. Lead dressing
3. Adjustment of critical voltages and picture settings
The example unit shown in the guide is a TH-42PX50U but the procedures listed
here are similar for other models of the GP8DU and GP8HDU chassis.
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