Panasonic GPH5D Service Manual

Panasonic Services Company

not designed for use by the general public. It does

National Training

TH-42PHD5/TH-50PHD5

TH-42PHW5/TH50PHW5

GPH5D Chassis

Plasma Display Panel

Troubleshooting Guide

This service information is designed for experienced repair technicians only and is

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.

Warning

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

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

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 TH42PHD5, but the technology is consistent with any GPH5D chassis.

2002 Model Line Up

Digital Cinema Reality

Advanced 3-dimensional

1366 x 768 XGA Resolution

TH-50PHW5

50-inch (127 cm)

Wide Plasma Display Plasma Contrast Automatic Tracking System (C.A.T.S.)

3-Dimensional Progressive

VGA Resolution (UXGA

TH-42PW5

42-inch (106 cm)

HD Plasma Display

HD Panel

Progressive Scan

(UXGA Compatible)

Scan

Compatible)

TH-42PHW5

42-inch (106cm)

TH-37PW5

37-inch (94cm)

Specifications

Our New 50” & 42” HD Progressive Panels

The industry’s highest-resolution panels

Panasonic Company PI Company F/H

Scanning Method Progressive Progressive

50-

inch

1,366 x 768=

1.05 million pixels

1,280 x 768=

0.98 million pixels

Interlace

N/A

Pixel pitch

42/43-

inch

Pixel pitch

Relationship between Picture resolution and Scanning method: 768p > 720p > 680p = 1080i > 1024i

0.810 (H) x 0.810 (V) = 0.656

(42” Screen size)

1,024 x 768=

0.79 million pixels

0.898 (H) x 0.674 (V) = 0.605

0.858 (H) x 0.808 (V) = 0.693

(43” Screen size)

1,024 x 768=

0.79 million pixels

0.930 (H) x 0.698 (V) = 0.649

1,024 x 5120.52

million pixels

0.90 (H) x 1.02 (V)=

0.918 / 2= 0.459 [1frame]

Features

410,000

Pix

els

790,000

pixels

definition

Pixel explanation

SD (Standard Definition) Panel

852 pixels

480 pixels

Provides the optimum number of pixels for viewing

standard broadcasts and DVD.

HD (High-Definition) panel

1,024 pixels

768 pixels

Reproduces even the tiniest details of high-

sources and other high-quality images.

Figure 1

protection

filter glass

the natural

reproduction.

Scan Explanation

Panasonic progressive 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.

ALIS system Interlace scan

New front

improves

reds

New

phosphors

improve the

blue color

•

Figure 3

New Asymmetrical Cell Structure Panel

Figure 3 shows the unique asymmetrical cell structure that achieves both high brightness and crisp whites. The asymmetrical arrangement of the red, blue and green cells that control color reproduction results in a dramatically improved lightemitting balance of the three primary colors. This reproduces purer whites while maintaining a high level of brightness.

Model Differences

SSiinnggllee SSccaann ((SSDD))

DDuuaall SSccaann ((HHDD))

•Simple and low cost circuit

Figure 4

•High performance

•Higher brightness

Figure 5

Disassembly

Rear Cover Removal

Remove the 27 screws, shown in Figure 6, and then pull away the rear cover.

Removal of the shield Remove the six screws, shown in

Figure 7, and then pull away the rear shield cover.

Figure 6

Figure 8

Figure 7

Location of Lead Wiring

•

High frequency electromagnetic signals can create electrical interference within the unit. Be sure to route all wires through their respective harnesses reference.

The chart below is an illustration representing the connectors and the wire harnesses associated

Clamper Locations

Figure 9

with them.

Harness Number

Connector Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Z6 è P6 Œ

Z10 è D10 Œ

Z17è D17 • D12 èD22

D16 è D26

D25 è P5 Œ

D27 è P7 Œ SC2 è P2 Œ Ž Œ Œ Œ Œ SC4 è P4 Œ Ž Œ Œ Œ Œ

SC20 è D20 Œ

SC21è D21 Œ

H37è Z3 Œ Œ Œ Œ

H37 èZ4 Œ Œ Œ Œ Œ Œ Œ SS1 èP1 • SS3 èP3 Œ

SS32 èC32 SS42 èC42 Œ

ESC POWERè SS34 Œ

ESC V-BOARDè C44 Œ

F9 è P9 Fan 1 è P10 Œ Ž Œ Fan 2 è P11 • • Œ Fan 3 è P12 Œ Œ • Fan 4 è P13 Œ Œ Œ

Œ Œ Œ Œ

Œ Œ

Œ = Wind the cable through the clamper once

• = Wind the cable through the clamper two times Ž = Wind the cable through the clamper three times

42” HD PCB Board Layout Diagram

Figure 10

Printed Circuit Board Information Table

Board Name Part Number Function

C1 TNPA2428 Data Drive (Upper Left) C2 TNPA2429 Data Drive (Upper Right) C3 TNPA2430 Data Drive (Lower Right) C4 TNPA2431 Data Drive (Lower Left) D1 TZTNP01LLSB Format Converter D2 TNPA2427 Plasma AI Sub-Field Processor

F TNPA2444 Line filter H3 TNPA2249 Speaker terminal HX TZTNP01LLSU PC type Input terminal HZ TXNHZ40JJS RCA type Input terminal

P TXN/P10LLS Power supply P3 TNPA2439 Drive voltage oscillator P5 TNPA2440 Primary oscillator P6 TNPA2441 PFC oscillator P7 TNPA2442 Drive voltage protection P8 TNPA2443 Process voltage protection S1 TNPA2283AC Power switch SC TNPA2434 Scan out SD TNPA2433 Scan connection (Lower) SS TNPA2435 Sustain out

SS2 TNPA2436 Sustain connection (Upper) SS3 TNPA2437 Sustain connection (Lower)

SU TNPA2432 Scan connection (Upper) V1 TNPA2282AC Front SW. & Remote receiver

Z TNPA2445 Audio out

50” PCB Board Layout Diagram

Board Name Part Number Function

C1 TNPA2510 Data Drive (Upper Left) C2 TNPA2511 Data Drive (Upper Center) C3 TNPA2512 Data Drive (Upper Right) C4 TNPA2513 Data Drive (Lower Right) C5 TNPA2514AB Data Drive (Lower Center) C6 TNPA2515 Data Drive (Lower Left) C9 TNPA2608 Energy Recovery Circuit D1 TZTNP01MHSB Format Converter D2 TNPA2427AB Plasma AI Sub-Field Processor F TXN/F10MHS Line filter H3 TNPA2249 Speaker Terminal HX TZTNP02KESE PC type Input terminal HZ TXNHZ40JJS RCA type Input terminal P1 TXNP110MHS Power supply P3 TNPA2566 Drive voltage oscillator P5 TNPA2567 Primary oscillator P6 TNPA2568 PFC oscillator P7 TNPA2569 Drive voltage protection P8 TNPA2570 Process voltage protection S1 TNPA2283AC Power switch SC TNPA2434AB Scan out SD TNPA2518 Scan connection (Lower) SS TXNSS10MHS Sustain out SS2 TNPA2519 Sustain connection (Upper) SS3 TNPA2520 Sustain connection (Lower) SU TNPA2517 Scan connection (Upper) V1 TNPA2282AC Front SW. & Remote receiver Z TNPA2445 Audio out

Figure 11

42” SD PCB Layout Diagram

Figure 12

Board Name Part Number Function

C1 TNPA2540 Data Drive (Lower Right) C2 TNPA2541 Data Drive (Lower Left) D1 TZTNP01MMSB Format Converter D2 TNPA2589 Plasma AI Sub-Field Processor F TXN/F10MMS Line filter H3 TNPA2249 Speaker terminal HX TZTNP020JAS PC type Input terminal HZ TXNHZ40JJS RCA type Input terminal P TNPA2598 Power supply S1 TNPA2622 Power switch SC TNPA2534 Scan out SD TNPA2584 Scan Connection (Lower) SS TNPA2535 Sustain Out SS2 TNPA2536 Sustain Connection (Upper) SS3 TNPA2537 Sustain Connection (Lower) SU TNPA2583 Scan Connection (Upper) V1 TNPA2621 Front SW. & Remote Receiver Z TNPA2590 Audio out

Video Signal Path Explanation

HY/HZ Board

Figure 13

The "HY/ HZ" board is equipped with one Component input, one Composite input and one S-Video input. The Composite and S-Video inputs are applied to a switching circuit, which is controlled by the system control IC, located on the D1Board. The switch select command is sent via the SCL3 and SDA3 lines. After signal selection the composite or S-Video signals are amplified, buffered, and applied to a 3D comb filter inside IC3803. The 3D Comb filter converts the Composite input signals to Y, Pb, and Pr component signals. The output of IC3804 is applied to the D1 Board via pins 1, 3, and 5 of the connector H2/D2.

Individual amplifiers buffered the Component input signals that are then applied to the D1-Board via pins 15, 17, and 19 of the connector H2/D2. Vertical and Horizontal Sync signals are also amplified on this board before they are applied to the D1 Board.

HX Board

Figure 14

PC RGB Signals are input to the HX Board. The RGB signals as well as the vertical and horizontal sync signals are amplified by a series of transistor amplifiers. The RS232C communications bus line is also connected on this board. The RS-232C connection is provided so that operation changes can be made via PC. An example of an application of this port would be remote turn on of the unit for a kiosk or similar display.

The outputs of the HX board are applied to the D1 board via connector HX1/D3.

D1 Board

Figure 15

After the input signals are amplified by the HY/HZ and HX boards the desired signal is selected. The microprocessor sends the command via the IIC bus to the input select switch (IC3001). The video switch selects from one of the three inputs. The component video signal output from the video switch is amplified and converted to digital. An optional Digital Visual Interface (DVI) input bypasses the A/D process as DVI information is already in the digital format.

Concurrently, the desired sync signals are selected and applied to the Sync Processor. NTSC and Component sync signals are stripped from the Green video component while the PC sync is applied directly. The Sync Processor combines the On-Screen Display Sync signal with the input sync and converts them to match the video format.

The corresponding audio signal is selected by an Audio switch and applied to the Z board for further amplification

DVI Interface

Figure 16

An optional Digital Visual Interface (DVI) module connection is provided on this generation Plasma Display Panels. The DVI interface allows direct digital transfer from a display device to the panel. A VGA or component video signal requires a conversion from the digital to analog and then conversion back to digital prior to input to

the Format converter see Figure 17. The double conversion can introduce distortion to the signal.

Figure 17

Figure 18 shows an example of the DVI interface. It permits direct connection of the digital video signal to the Format converter. This bypasses the D/A and A/D process providing the better quality picture.

Installation of the DVI interface requires removal of the HY/HZ Board and replacing it with an optional DVI interface board.

Figure 18

Sync Process

Figure 19

The vertical and horizontal sync signal paths are slightly different depending on the Source signal.

RGB/PC Input Mode Sync

The vertical and horizontal sync signals generated by the input device are applied to connector D3 or D2 to a Sync switch (IC3002). IC3002 outputs the vertical and horizontal sync signals. The signals are inverted by IC8002 and then applied to a sync processor (IC9451). IC9451 mixes the image sync signal with the OSD sync signal prior to output to the format converter (IC9200).

Composite/ Component Video Input mode Sync

The video signals are applied to an input switch (IC3001). The output signal is separated into Y, Pb and Pr with Sync on green signal. The Sync on green signal is applied to a sync separator (IC8001). IC8001 outputs the Vertical and Horizontal sync signals. From that point on the sync path is the same as the RGB/PC input mode.

The A/D converter (IC9007) shapes the analog sync signal to clean digital pulses prior to input to the format converter.

D1 Board

Figure 20

D1-board consists of the Analog and Digital signal process. It also contains the Discharge control and Microprocessor control block. Supply voltages of 13.5V, 5V, Standby 5V, 3.3V, and 1.8 V operate the D1-board. The input RGB video signals are at 0.7Vp-p. Video signals in the form of parallel data and the control signals for the data drive circuit are output.

D1 Main ICs Operation

IC3001 Video Switch

The user selects the desired video input using the front panel button or the remote control. The microprocessor reads this data and sends out a command via the IIC bus line. The IIC data is read by IC3001 and the video input is chosen.

IC9007 A/D Converter

This integrated circuit converts the RGB analog signals to eight bit parallel data.

IC9200 Format Converter

The digital video data is converted to progressive scan and mixed with the OSD data. Other adjustments such as white balance, contrast and color are also corrected here. The two channels of data are output to the D2 board for the subfield drive circuit.

D2 Board

Figure 21

The D2 board provides the scan, sustain and data drive signals. The scan pulses are output to the SC board. The sustain pulses are output to the SS board. The data drive signals are output to the C1, C2, C3 and C4 boards. The C1 board drives the Upper right portion of the panel; the C2 board drives the upper left portion. The C3 and C4 boards drive the lower right and left portions of the panel respectively.

D2 Board details

Figure 22

The Plasma AI (Adaptive brightness Intensifier) circuits analyze the video program level for the distribution of dark and bright components. The upper and lower eight bit video signals are memorized into two Plasma AI processors IC9651 and IC9601. The Plasma AI circuits converts the 8 bit signal data to 10 bit signal data. The Flash memories contain the algorithms for the AI circuit. Two AI processors are used to speed up the scanning process and control the number of sustain periods. This increases the brightness and improves the contrast ratio.

SC Board Explanation

Figure 23

Figure 24

The SC Board consists of buffers and drivers used to generate the scan signals to the panel. The buffers provide isolation between the D2 board and the drivers. Connector SC20 provides the drive signals (140V, 100V and 18V). Connector SC21 provides trigger signals to switch the FET transistors. The D2 board switches the FETs on and off to create the distinctive scan signal. Each trigger signal switches a drive FET creating a portion of the waveform. For example, applying the CPH signal to the 140V FET creates the peak portion of the waveform, see figure 23.

Figure 25

After the scan waveform is developed on the SC Board, it is applied to the SU and SD boards for de-multiplexing. The signal is input to a series of shift registers inside the PDP scan driver IC. Figure 25 shows an example of the demultiplexing circuit. There are six driver ICs on the SU board and six on the SD board.

SS Board Explanation

Figure 26

After the video signal is processed on the D2 board, the sustain and erase pulses are output to the SS board. The erase pulse is output at the beginning of each scan period. The pulse is applied to the SS2 and SS3 boards to remove the previous charge for the upper and lower sections of the display panel. The sustain pulses are also developed on the D2 board and are applied after the scan periods.

Figure 27

Figure 28

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