Panasonic PT51G44A - 51" PROJECTION TV Bedienungsanleitung

ORDER NO. MTC9903012Cl

Service

Manual

Color Video ProjectionSystem

Main Manual

(P3)

Models

Chassis

PT-51G44A AP815

PT-51G44CA AP815

PT-51G54A AP815

PT-51G54CA AP815

PT-61G54A BP815

PT-61G54CA BP815

Note:

Refer to Technical Guide

(P3)

for

functional descriptions and Block

Diagrams. (MTC9703689G1).

This Service manual is issued as a service guide for the modelsof the P3family listed above. Included in this manual

are a set of schematic, block diagrams, functional descriptions, alignment procedures,disassemblyprocedures,and a

complete parts list.

"WARNING!

ThisServiceManualisdesignedfor experienced repairtechniciansonly and isnotdesignedfor usebythe generalpublic.

It does not contain warnings or cautionsto advise non-technicalindividualsof potentialdangers in attemptingto service a product.

Productspoweredbyelectricity should be servicedor repairedonly byexperienced professionaltechnicians.

Any attemptto

serviceor repairthe productor products dealt with inthis Service Manualby anyone elsecould result in serious injury or death."

Panasonic,

1999

by MatsushitaElectric Corporationof

and distributionis a violationof law.

Important Safety Notice

...................

TintJColorAdjustment

..............

Audio Adjustment

.................

Safety Precautions

.................

2 MTS Circuit Adjustment

............

...............

ImportantSafetyTest

Service Adjustments

Service Notes

...........................

(Mechanical Controls)

................

2nd Tuner-VCO Adj

.............

2nd Tuner- RF-AGC Adj

.........

Receivers FeatureTable

..................

Boards Designations 8

FOLDOUTS

.....................

Location of Controls (Receiver)

.........

Receiver Front Control Panel 9

Location of Controls (Remote)

Disassembly for Service

.................

Front DecorativePanel Removal

.....

Screen FrameAssembly

............

BottomBack Cover

................

CRT Replacement

.................

ScreenAssemblies

................

Chassis Service Adjustment Procedures

...

Chassis Boards Layout

.............

B+ Voltages...................... 18

CRT Set Up

............................

Dynamic FocusAdjustment

.........

Focus: ElectricalAdj

................

Focus:Optical Lens Adj

.............

Centering Magnets Adj

..............

HorizontalSize Adjustment

..........

Digital Convergence

....................

....

Serviceman Mode (Electronic Controls) 26

EnteringServiceman Mode

..........

Toggle between Modes

.............

Exitingthe Serviceman Mode

........

Purity Check

.....................

Service Adjustments

(Electronic Controls)

.................

Schematics. Voltages

Waveforms

A-Board

Left Portion

..............

Sheet-1

Right Portion

............

.Sheet

.2A

B-Board

....................

Sheet-3A

C-Board

Sheet-26

....................

D-Board

K-Board

ske+A

....................

LR.Board

..................

LG-Board

..................

LBBoard

..................

R-Board

....................

Se&+5A

SBoard

....................-

XBoard

....................

-38

Y-Board

....................

-38

YC-Board

.................

-9reelldS

TBoard

....................

LAYOUTS

A-Board

...................

&Board

...................

C-Board

....................

Swa-28

D-Board

..........

........

-9PeC5A

K-Board

...................

zwx+5A

LR-Board

..................

-SreeclB

LG.Board

...................

SleeC1

LB-Board

...................

-16

R-Board

....................

SreetSA

S-Board

SreeCSA

....................

X-

Board

....................

-38

yard

....................

-3B

YC-Board

..................

sheet46

T-Board

....................

Sheei4

Sub.Adjustments

..................

VCJ Cut-OffAdjustments

...........

Sub-BrightnessAdjustment

..........

Sub.Contrast

.....................

CRT DC Bias

.....................

Red, Green

Blue Cutoff

...........

White BalanceAdj

.................

FEATURE

TABLE

Table

FeatureTable

Boards Designation

Location of Controls (Receiver)

POWER

(

VOLUME,

CHANNEL

ACTtON

TVNlDEO

. .

Figure

Locationof Controls Receiver

Quick ReferenceControl Operation

Power Button

Pressto turn OIV or OFF.

Volume Buttons

Press to adjust Sound Level, or to adjust Aud~oMenus, Video

Menus, and select operating features when menus are displayed

Channel Buttons

Press to select programmed channels. Press to highlight desired

features when menus are displayed. Also use to select Cable Converter box channels

after programming Remote Control infra-red codes (the TV/AUX/CABLE switch must

be set in CABLE position).

Action Button

Press to display Main Menu and access On Screen feature and

Adjustment Menus.

TVNideo Button

Pressto select TV or one of two Video Inputs,for the Main Picture

or the PIP frame (when PIPframe is displayed).

Locationof Controls(Remote)

Pressto turn ON and OFF.

second press resumessound.

Pressalso to access and delete

Closed Captiondisplay.

Componentfunction buttons

Pressto adjust TV sound level.

Usewith Channel buttonsto

navigate in menus.

Pressto switch to the previous

Componentfunction buttons.

DBSfunction buttons.

Programmablebuttonthat can

operate upto seven (7) functions at

once

Pressto select TV or Video input.

Pressto select channels.

Usewith volume buttonsto

navigate in menus.

DBSfunction buttons.

Pressto displayTime, status

of SleepTimer. Channel,

Mdeo

mode and Channel

Caption

(StabnIdentifier).

DVD

function buttons.

Press

numeric

keypadto select any

channel.

Figure

Location of Controls (Remote)

Locationof Controls (Remote)

Press to turn ONand OFF.

I I

Pressto mute sound.

A second press resumes sound.

Press also to access and delete

Closed Caption display.

Component function buttons

Press to adjust TV sound level.

Use with Channel buttons to

navigate in menus.

ress to switch to the previous

channel.

Programmable button that can

operate up to seven

(7)

functions at

once

Pressto select TV or Video input.

Pressto select channels.

Use with volume buttons to

navigate in menus.

Press to display Main Menuand

access or exit On Screen features

and Adjustment Menus.

Component function buttons.

Figu

Ire

Location of Controls

(Re

Pressto display Time, status

of Sleep Timer, Channel,

Video mode and Channel

Caption (Station Identifier).

-1

Press numeric keypad to select any

channel.

Disassembly

for

Service

Note:

Board ground wires may have to be disconnected to disassemblesome

boards.

All

ground wires must be

reconnectedusingjumper leads, if necessary, beforepower is appliedto Receiverfor

service.

Front Decorative Panel Removal

(See

Figure

8.)

The Front Decorative Panel is secured by velcro

strips. Grip the panel from the sides and pull

forwardto remove.

The Front Cover is secured by screws.

lecorative Panel

Figure 8. Panel Removal.

Screen Frame Assembly (See Figure

Removethe front decorativepanel. (see Figure8)

Remove

screws from the bottom edge of the

frame.

Unplug the keyboard cable from the bottom of the

screenframe.

Grasp the frame on the sides at the bottom. Pull

forward at bottom, push up frame then pull out top

edge.

Screen (See Figure

10)

Placeframe face down on soft surface.

Remove FrameChannel from top edge.

Removescreen brackets.

RemoveK-Board.

Screen FrameChann

Pull Forwardand

(4)Screws

KeyboardCable

Figure

Screen FrameAssembly.

a a

-.-

Screen Brackets

Velcro

Dot

--.

Rear

View

K-Board

LenticularScreen

..-~

~~~-.~.......~-.

FresnelScreen

Figure

10.

ScreenAssembly

Disassemblyfor Service (Cont.)

Disassembly

Speaker Units Replacement

1. Remove the front decorative panel located under

control panel. (see Figure 8)

2. Each Left and Right speaker is secured to the

cabinet with (4) screws for each bracket.

3. Disconnect the R

L speaker lead connectors

from the speaker units.

Bottom Back Cover (Figure

11)

1. Remove (8) hex screws around its perimeter

(marked with arrows).

Remove (3) screws from around the

terminal

board (marked with arrows).

Jacks

Main Chassis Block

(Figure

12)

1. Remove Front Decorative Panel and Front Cover.

(Figure 8)

2. Removethe Bottom Back Cover. (Figure 11

)

3. The main chassis Block is secured to the cabinet

by (4) screws (2 at front, behind the decorative

panel, 2 inside on bottom of optical frame).

4. Remove Wires (K1 connector and Speaker

connectors, A8

A9, on A-Board) and Pull out the

Main Chassis Block.

Figure 12. Chassis Removal

Figure 11. Back Covers Removal

Back Cover Asserrrbly (Figure

11)

1. The top back cover is secured with (6) screws

around its perimeter.

2. Lift bottom cover up and pull out at the bottom.

Be careful not to damage the mirror attached to the

underside of cover.

Disassemblyfor CRT Replacement

To facilitate CRT replacement, the complete CRT

mounting chassis does not need to be removed.

1. Remove the main chassis block from the cabinet

(Figure 12),

2. Removethe Optical bracket metal cover (rear side)

by removing (6) screws from back, (2) screws from

top, and (2) screws from each side. (Figure 13)

BACK VIEW Optical Bracket

Figure 13.CRT Replacement

-13-

Disassembly

for

Service

(Cont.)

Remove the defective CRT anode lead from the

high voltage distributor block that is mounted on X-RAYS SHIELD

the Flyback Transformer. Discharge to CRT 10. TO insure X-Rays radiation protection, the lens

chassis. must be mounted in place at all times when power

4. Unplug connectors from the B-Board. (See board is appliedto the receiver.

layout.) B9for Red, 810for Green, or I311 for Blue.

5. Unplug the defective CRT black Dag ground

connectorfrom the CRT Board.

6. Remove the CRT Board from the defective CRT

neck.

7. Remove (2) screws from the defective CRT

housing (Figure 14).**

CAUTION:

Do not remove the (4) CRT

lensscrews.

Release CRT anode lead from CRT chassis wire

clamp and all other wires from holders.

9. Loosen a screw that secured the DY and remove it

from the CRT neck.

Optical Bracket Cover

~i~ure14.CRT Replacement.

CAUTION:

Support the CRT Assembly

when looseningscrews.

CRT Replacement

RemoveCRT focus lens assembly (4 screws).

Wire the anode leadwire.

Figure 16.Wire Guide.

Install yoke with other CRT neck assemblies on

CRT neck in the same order and position as

removedfrom the defective CRT.

Press yoke against bell of CRT and tighten the

clampjust snug enough so it will not easily shift.

Assemble CRT focus lens assembly to new CRT

with (4) screws. Make sure focus lens adjustment

nut is in the same location as on other CRT focus

lens.

Figure 15. CRT Assembly.

2. Lay CRT face down on a soft cloth.

Note position of yoke with centering tabs and

removefrom defective CRT.

4. Remove CRT Dag ground from defective CRT.

Mount it on the replacementCRT exactly as it was

on the defective CRT.

Note:

Replacement CRT comes with

anode lead attached.

Figure 17. Order of Screwsduring Assembly.

Note:

Please assemble with screws in the order

shown and tighten with the same torque.

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