Panasonic PT51G44A - 51" PROJECTION TV User manual

ORDER NO. MTC9903012Cl
82
Service Manual
7
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,
Copyright 1999 by MatsushitaElectric Corporationof
America. All rights reserved. Unauthorized copying
and distributionis a violationof law.

Important Safety Notice ................... 2 TintJColorAdjustment .............. 29
Audio Adjustment ................. 30
Safety Precautions ................. 2 MTS Circuit Adjustment
............ 30
...............
ImportantSafetyTest 3
Service Adjustments
Service Notes
........................... 5
(Mechanical Controls) ................ 31
2nd Tuner-VCO Adj .............
2nd Tuner- RF-AGC Adj .........
Receivers FeatureTable .................. 7
Boards Designations 8
FOLDOUTS i
.....................
Location of Controls (Receiver)
......... Receiver Front Control Panel 9
Location of Controls (Remote)
Disassembly for Service
................. 12
Front DecorativePanel Removal ..... 12
Screen FrameAssembly
............ 12
BottomBack Cover
................ 13
CRT Replacement
................. 14
ScreenAssemblies
................ 16
Chassis Service Adjustment Procedures ... 17
Chassis Boards Layout ............. 17
B+ Voltages...................... 18
CRT Set Up ............................ 19
Dynamic FocusAdjustment ......... 19
Focus: ElectricalAdj
................ 19
Focus:Optical Lens Adj
............. 19
Centering Magnets Adj
.............. 20
HorizontalSize Adjustment
.......... 20
Digital Convergence .................... 21
....
Serviceman Mode (Electronic Controls) 26
EnteringServiceman Mode .......... 26
Toggle between Modes
............. 26
Exitingthe Serviceman Mode
........ 26
Purity Check
..................... 27
Service Adjustments
(Electronic Controls)
................. 28
Schematics. Voltages
& Waveforms
a,
A-Board j! 1
Left Portion .............. Sheet-1 A
Right Portion ............ .Sheet .2A
B-Board .................... Sheet-3A
C-Board Sheet-26
I!
....................
.................... D-Board
K-Board
ske+A
-:
....................
LR.Board .................. B
LG-Board .................. B
LBBoard .................. .- 16
R-Board .................... Se&+5A
SBoard ....................-
XBoard .................... -38
Y-Board .................... -38
YC-Board ................. -9reelldS
TBoard ....................
LAYOUTS
e -
A-Board ................... .-
&Board ................... --
C-Board .................... Swa-28
D-Board .......... : ........ -9PeC5A
K-Board ................... zwx+5A
LR-Board .................. -SreeclB
LG.Board ................... SleeC1 B
LB-Board ................... -16
R-Board .................... SreetSA
S-Board
SreeCSA
e-
....................
X- Board .................... -38
yard .................... -3B
YC-Board .................. sheet46
T-Board .................... Sheei4
Sub.Adjustments .................. 28
VCJ Cut-OffAdjustments
........... 28
Sub-BrightnessAdjustment
.......... 28
Sub.Contrast ..................... 28
CRT DC Bias
..................... 29
Red, Green
& Blue Cutoff ........... 29
White BalanceAdj ................. 29

FEATURE TABLE
Table 1 : FeatureTable

Boards Designation

Location of Controls (Receiver)
POWER ( VOLUME, 'l CHANNEL A ACTtON TVNlDEO
e I FC . I I. . I 9- . .. . , ,, . + +
. . I
Figure 5. 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)
11 Pressto turn ON and OFF. 11
A second press resumessound.
Pressalso to access and delete
Closed Captiondisplay.
1) Componentfunction buttons (1
Pressto adjust TV sound level.
Usewith Channel buttonsto
navigate in menus.
Pressto switch to the previous
1 I Componentfunction buttons. / 1
DBSfunction buttons.
Programmablebuttonthat can
operate upto seven (7) functions at
once
11 Pressto select TV or Video input. I
Pressto select channels.
Usewith volume buttonsto
navigate in menus.
II
DBSfunction buttons.
I I
11
Pressto displayTime, status
of SleepTimer. Channel,
Mdeo mode and Channel
Caption (StabnIdentifier).
!I DVD function buttons.
1-
i 1 Press numeric keypadto select any
channel.
I
Figure 6. Location of Controls (Remote)

I
Locationof Controls (Remote)
I I Press to turn ONand OFF. I I
Pressto mute sound.
A second press resumes sound.
Press also to access and delete
I Closed Caption display.
11 Component function buttons )I
Press to adjust TV sound level.
Use with Channel buttons to
navigate in menus.
II
ress to switch to the previous
channel.
11
Programmable button that can
operate up to seven
(7) functions at
once
I( Pressto select TV or Video input. 11
Pressto select channels.
I
Use with volume buttons to
navigate in menus.
Press to display Main Menuand
1
access or exit On Screen features
and Adjustment Menus.
I Component function buttons.
U
Figu Ire
! 7. 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.)
1. The Front Decorative Panel is secured by velcro
strips. Grip the panel from the sides and pull
forwardto remove.
2. The Front Cover is secured by screws.
VJ lecorative Panel
Figure 8. Panel Removal.
Screen Frame Assembly (See Figure 9)
1. Removethe front decorativepanel. (see Figure8)
2. Remove 4 screws from the bottom edge of the
frame.
3. Unplug the keyboard cable from the bottom of the
screenframe.
4. 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)
1. Placeframe face down on soft surface.
2. Remove FrameChannel from top edge.
3. Removescreen brackets.
4. RemoveK-Board.
Screen FrameChann #@
I
\
Pull Forwardand Up
4
f e& (4)Screws
KeyboardCable
I I
Figure 9. Screen FrameAssembly.
a a 4
6 1 1 fS
-
k- -.- 4
Screen Brackets Velcro
Velcro Dot Dot
',
." r
B b
- ..
. --.
-
L I
I
!
- - -
I ,-
-
Rear View ' K-Board '1
b \<
- LenticularScreen
..-~ ~~~-.~.......~-.
FresnelScreen
Figure 10. ScreenAssembly

Disassemblyfor Service (Cont.)
Disassembly of 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.
6
Bottom Back Cover (Figure 11)
\
1. Remove (8) hex screws around its perimeter
(marked with arrows).
2. Remove (3) screws from around the AN terminal
board (marked with arrows).
AN 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.
I
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.
/ 3. Be careful not to damage the mirror attached to the
I
underside of cover.
I 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
/I
Figure 13.CRT Replacement
-13-

Disassembly for Service (Cont.)
3. Remove the defective CRT anode lead from the
high voltage distributor block that is mounted on X-RAYS SHIELD
A
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.
8. 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
1. RemoveCRT focus lens assembly (4 screws). 5. Wire the anode leadwire.
Figure 16.Wire Guide.
6. Install yoke with other CRT neck assemblies on
CRT neck in the same order and position as
removedfrom the defective CRT.
7. Press yoke against bell of CRT and tighten the
clampjust snug enough so it will not easily shift.
8. 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.
3. 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 H. V.
anode lead attached.
Figure 17. Order of Screwsduring Assembly.
C
Note: Please assemble with screws in the order
shown and tighten with the same torque.