This simplified service manual is issued to add listed models to the main service manual order No. MTNC000417C1
(CT-27D10B). A set of unique schematics and a complete parts list are included in this simplified manual. Alignment
procedures, additional squematics, dissasembly procedures are available for 27” models in simplified order
No. MTNC010201A1 (CT-27D11E) and for 32” and 36” models in simplified order No. MTNC010305A1 (CT-32D11E)
Please file and use this simplified service manual together with simplified service manual order No. MTNC010201A1,simplified order No. MTNC010305A1 and main service manual, order No. MTNC000417C1.
“WARNING! This servicemanual is designed for experiencedrepair techniciansonly 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 manual by anyone else could result in serious injury or death.”
The service technician is requiredtoreadand follow the “Safety Precautions”and“Important Safety Notice” in this Manual.
®
Copyright2002by Matsushita Electric Corporation of
America. All rights reserved. Unauthorized copying
and distribution is a violation of law.
Important Safety Notice
Special components are used in this television set which are important for safety. These parts are identified on the
schematic diagram by the symboland printed in BOLD TYPE on the replacement part list. It is essential that
these critical parts are replaced with the manufacturer’s specified replacement part to prevent X-ray radiation,
shock, fire or other hazards. Do not modify the original design without the manufacturer’s permission.
Safety Precautions
General Guidelines
An Isolation Transformer should always be used
during the servicing of a receiver whose chassis is not
isolated from AC power line. Use a transformer of
adequate power rating as this protects the technician
from accidents resulting in personal injury from
electrical shocks. It will also protect the Receiver from
being damaged by accidental shorting that may occur
during servicing.
When servicing, observe the original lead dress,
especially in the high voltage circuit. Replace all
damaged parts (also parts that show signs of
overheating.)
Always Replace Protective Devices,suchas
fishpaper, isolation resistors and capacitors, and
shields after servicing theReceiver. Use only
manufacturer’s recommended rating for fuses, circuits
breakers, etc.
High potentials are present when this Receiver is
operating. Operation of the Receiver without the rear
cover introduces danger for electrical shock. Servicing
should not be performed by anyone who is not
thoroughly familiar with the necessary precautions
when servicing high-voltage equipment.
Extreme care should be practiced when Handling the
Picture Tube. Rough handling may cause it to implode
due to atmospheric pressure. (14.7 lbs per sq. in.). Do
not nick or scratch the glass or subject it to any undue
pressure. When handling, use safety goggles and
heavy gloves for protection. Discharge the picturetube by shorting the anode to chassis ground (not to
the cabinet or to other mounting hardware). When
discharging connect cold ground (i.e. dag ground lead)
to the anode with a well insulated wire or use a
grounding probe.
Avoid prolonged exposure at close range to unshielded
areas of the picture tube to prevent exposure to Xray radiation.
The Test Picture Tube used for servicing the chassis
at the bench should incorporate safety glass and
magnetic shielding. The safety glass provide shielding
for the tube viewing area against X-ray radiation as
well as implosion. The magnetic shield limits the X-ray
radiation around the bell of the picture tube in addition
to the restricting magnetic effects. When using a
picture tube test jig for service, ensure that the jig is
capableof handling40kV withoutcausingXray radiation.
Before returning a serviced receiver to the owner,
the service technician must thoroughly test the unit to
ensure that is completely safe to operate. Do not use a
line isolation transformer when testing.
Leakage Current Cold Check
Unplug the AC cord and connect a jumper between the
two plug prongs.
Measure the resistance between the jumpered AC plug
and expose metallic parts such as screwheads,
antenna terminals, control shafts, etc. If the exposed
metallic part has a return path to the chassis, the
reading should be between 240kΩ and 5.2MΩ. If the
exposed metallic part does not have a return path to
the chassis, the reading should be infinite.
Leakage Current Hot Check (Fig. 1)
Plug the AC cord directly into the AC outlet. Do not use
an isolation transformer during the check.
Connect a 1.5kΩ 10 watt resistor in parallel with a
0.15µF capacitor between an exposed metallic part
and ground. Use earth ground, for example a
water pipe.
Using a DVM with a 1000 ohms/volt sensitivity or
higher, measure the AC potential across the resistor.
Repeat the procedure and measure the voltage
present with all other exposed metallic parts.
Verify that any potential does not exceed 0.75 volt
RMS. A leakage current tester (such a Simpson Model
229, Sencore Model PR57 or equivalent) may be used
in the above procedure, in which case any current
measure must not exceed 0.5 milliamp. If any
measurement is out of the specified limits, there is a
possibility of a shock hazard and the Receiver must be
repaired and rechecked before it is returned to the
customer.
Figure 1. Hot Check Circuit
X-ray Radiation
WARNING: The potential source of X-ray radiat ion in the
TV set is in the High Voltagesection and the picture tube.
Note:It is important to use an accurate, calibrated
high voltage meter.
Set the brightness, pict ure, sharpness and color
controls to Minimum. Measure the High Voltage. For
27”modelsthehighvoltageshouldread
28.30kV ± 1.25kV, 32” models the high voltage should
read 29.25kV ± 1.25kV and for 36” models the high
voltage should read 31.50kV ± 1.25kV. If the upper
limit is out of tolerance, immediate service and
correction is required to insure safe operation and to
prevent the possibility of premature component failure.
Horizontal Oscillator Disable Circuit Test
This test must be performed as afinal check before the
Receiver is returned to the customer. See Horizontal
Oscillator Disable Circuit Procedure Check in this
manual.
Service Manual
-2-
About lead free solder (PbF)
component
Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and (Cu) although other types are available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For
service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be
used.
PCBs manufactured using lead free solder will have the PbF within a leaf Symbolstamped on the
back of PCB.
Caution
• Pb free solder has a higher melting point than standard solder. Typically the melting
point is 50 ~ 70 °F(30~40°C) higher. Please use a high temperature soldering iron
and set it to 700 ± 20 °F(370± 10 °C).
• Pb free solder will tend to splash when heated too high (about 1100 °For600°C).
If you must use Pb solder, please completely remove all of the Pb free solder on the
pins or solder area before applying Pb solder. If this is not practical, be sure to heat the
Pb free solder until it melts, before applying Pb solder.
• After applying PbF solder to double layered boards, please check the component side
for excess solder which may flow onto the opposite side. (see figure below)
component
remove all of the
excess solder
pin
slice view
solder
Suggested Pb free solder
There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu
(tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder
canalsobeused.
0.3mm X 100g
0.6mm X 100g1.0mm X 100g
-3-
Service Manual
Table of Contents
ImportantSafetyNotice...................2
SafetyPrecautions .................2
HorizontalOscillator Disable Circuit . . . . 2
About lead free solder (PbF) . . . . . . . ........3
ServiceNotes...........................5
ReceiversFeatureTable ..................7
BoardDescriptionTable ..................9
Locationofcontrols(remote).............10
PartsList..............................13
Description of Abbreviations Guide. . . . 32
FoldoutNotes..........................33
Schematics
A-Board
TNP2AH017AJ, TNP2AH017AK
TNP2AH017AL....................34
TNP2AH017BH, TNP 2AH017BK
TNP2AH017BL....................39
TNP2AH017BJ....................44
TNP2AH017CG, TNP2AH017CH . . . . . . 49
Service Manual
-4-
Service Notes
Note:These components are affixed with glue. Be careful not to break or damage any foil under the
component or at the pins of the ICs when removing. Usually applying heat to the component for a
short time while twisting with tweezers will break the component loose.
Leadless Chip Component
(surface mount)
Chip components must be replaced with identical chips
due to critical foil track spacing. There are no holes in
the board to mount standard transistors or diodes.
Some chips capacitor or resistor board solder pads
may have holes through the board, however the hole
diameter limits standard resistor replacement to 1/8
watt. Standard capacitor may also be limited for the
same reason. It is recommended that identical
components be used.
Chip resistor have a three digit numerical resistance
code - 1st and 2nd significant digits and a multiplier.
Example: 162 = 1600 or 1.6kΩ resistor, 0 = 0Ω (jumper).
Chip capacitors generally do not have the value
indicated on the capacitor. The color of the component
indicates the general range of the capacitance.
Chip transistors are identified by a two letter code. The
first letter indicates the type and the second letter, the
grade of transistor.
Chip diodes have a two letter identification code as per
the code chart and are a dual diode pack with either
common anode or common cathode. Check the parts
list for correct diode number.
Component Removal
1. Use solder wick to remove solder from component
end caps or terminal.
2. Without pulling up, carefully twist the component
with tweezers to break the adhesive.
3. Donotreuseremovedleadlessorchip
components since they are subject to stress
fracture during removal.
Chip Component Inst allation
1. Put a small amount of solder on the board
soldering pads.
2. Hold the chip component against the soldering
pads with tweezers or with a miniature alligator clip
and apply heat to the pad area with a 30 watt iron
until solder flows. Do not apply heat for more than
3 seconds.
Chip Components
How to Replace Flat-IC
- Required Tools -
•Soldering iron•De-solder braids
•Sharpen pliers (wire
cutters and long nose)
1. Cut the pins of the defective IC with the wire cutters
pliers, and remove it completely away from the
board. If the IC is glued to the board, apply hot air
to complete the removal. CAUTION- Do not pull or
twist the pliers, may damage the soldering pads in
the board.
Flat-IC
2. UsingtheSolderingIronandthelongnosepliers,
remove the IC pins that still attached to the board.
3. Using the De-solder braid and the Soldering Iron,
remove the solder from the board soldering pads.
4. Position the new Flat-IC in place (apply the pins of
the Flat-IC to the soldering pads where the pins
need to be soldered). Properly determine the
positions of the soldering pads and pins by
correctly aligning the polarity symbol. Start aligning
and soldering Pin No.1, then align and solder the
pin in the apposite corner of the IC, this will help to
align the rest of the pins.
Polarity
Symbol
•Magnifier
Soldering
Iron
De-Solder
Braid
Soldering
Iron
5. Solder all pins to the soldering pads using a fine
tipped soldering iron.
Solder
Soldering
Iron
6. Check with a magnifier for solder bridge between
the pins or for dry joint between pins and soldering
pads. To remove a solder bridge, use a de-solder
braid as shown in the figure below.
De-Solder
Braid
-5-
Solder
Bridge
Service Manual
Soldering
Iron
IMPORTANT: To protect against possible damage to
the solid state devices due to arcing or static discharge,
make certain that all ground wires and CRT DAG wire
are securely connected.
CAUTION: The power supply circuit is above earth
ground and the chassis cannot be polarized. Use an
isolation transformer when servicing the Receiver to
avoid damage to the test equipment or to the chassis.
Connect the test equipment to the proper ground ( ) or
() when servicing, or incorrect voltages will be
measured.
WARNING: This Receiver has been designed to meet
or exceed applicable safety and X-ray radiation
protection as specified by government agencies and
independent testing laboratories.
To maintain original product safety design standards
relative to X-ray radiation and shock and fire hazard,
parts indicated with the symbolon the schematic
must be replaced with identical parts. Order parts from
the manufacturer’s parts center using the parts
numbers shown in this service manual, or provide the
chassis number and the part reference number.
4. Turn the Receiver OFF. Connect a jumper across
IC803 pin 3 and pin 4. Apply +9V DC to cathode of
D001.
5. Reduce the AC supply voltage to approximately
45V. Connect the high voltage meter to the CRT
anode. (H.V. button).
Note:Use the Dag Ground (C10 on the CRT Board)
to connect the (-) lead of the meter.
6. Turn the receiver ON. Slowly increase the AC
supply voltage and verify that for 27” models the
high voltages does not exceed 37.1kV, 32” models
the high voltages does not exceed 37.5kV and for
36” models the high voltages does not exceed
41.2kV when horizontal just begins to pull out of
sync. If the high voltage is not within the specified
limit, the cause must be determined and corrected
before the Receiver is returned to the customer.
For optimum performance and reliability, all other parts
shouldbereplacedwithcomponentsof
identical specification.
Horizontal Oscillator Disable Circuit
This chassis employs a special circuit to protect
against excessive high voltage and beam current. If, for
any reason, the high voltage and beam current exceed
a predetermined level this protective circuit activates
and detunes the horizontal oscillator that limits the high
voltage. The over-voltage protection circuit is not
adjustable. However, if components indicated by the
symbolon the schematic in either the horizontal
sweep system or the over-voltage protection circuit
itself are changed, the operation of the circuit should be
checked using the following procedure:
Equipment needed to check the disabled circuit:
1. Voltmeter (0 - 200V scale)
2. High Voltage Meter (0- 50kV)
3. Variac or Isolation Transformer
Procedure:
1. Tune in a station to verify that the horizontal is
in sync.
2. Obtain a Monoscope pattern or a signal generator
crosshatch pattern
3. Connect the voltmeter (-) lead to TPD2 and the (+)
lead to TPD1 (junction of D555 anode, R556 &
R557). Set Bright level to (0) and Picture for a 1.8
volt reading on the voltmeter.
Service Manual
-6-
Receiver Feature Table
FEATURE\MODEL
ChassisRP341TP338QP338SP338
No. of channels181181181181
Menu languageEng/Span/FrEng/Span/FrEng/Span/FrEng/Span/Fr
Closed CaptionXX X X
V-Chip (USA/CANADA)XX X X
PIP--1T2T--75 Ω inputXX X X
Remote Model NumberEUR511514EUR511511EUR7613Z30EUR7613Z10
Picture tubeM80JUA061XM68LGL061XM68LGL061XM68LGL061X
Comb Filter3 Dig3 Dig3 Dig3Dig
HEC/VEC (X=BOTH)HECHECHECHEC
V/A norm (X=BOTH)XX X X
Color TempXX X X
MTS/SAP/DBXXX X X
BASS/BL/TRE ControlXX X X
AI So undXX X X
SurroundXX X X
Built-in audio power5W x 2 (10%)5W x 2 (10%)5W x 2 (10%)5W x 2 (10%)
No. of speakers222 2
A/V in (rear/front)2(2/0)3(2/1)3(2/1)3(2/1)
S-VHS Input (rear/front)1/01/01/01/0
Component Input
Specifications are subject to change without notice or obligation. Dimensions and weights are approximate.
-7-
Service Manual
Receiver Feature Table
FEATURE\MODEL
ChassisJP342KP342NP341TP341QP341
No. of channels181181181181181
Menu languageEng/Span/FrEng/Span/FrEng/Span/FrEng/Span/FrEng/Span/Fr
Closed CaptionXX X XX
V-Chip (USA/CANADA)XX X XX
PIP2T---2T---1T
75 Ω inputXX X XX
Remote Model NumberEUR7613Z30EUR7613Z10EUR7613Z30EUR7613Z10EUR511501
Picture tubeA90LLD361XA90LLD361XM80JUA061XM80JUA061XM80JUA061X
Comb Filter3 Dig3 Dig3 Dig3 Dig3 Dig
HEC/VEC (X=BOTH)HECHECHECHECHEC
V/A norm (X=BOTH)XX XXX
Color TempXX X XX
MTS/SAP/DBXXX XXX
BASS/BL/TRE ControlXX XXX
AI SoundXX XXX
SurroundXX XXX
Built-in audio power5W x 2 (10%)5W x 2 (10%)5W x 2 (10%)5W x 2 (10%)5W x 2 (10%)
No. of speakers22222
A/V in (rear/front)3(2/1)3(2/1)3(2/1)3(2/1)3(2/1)
S-VHS Input (rear/front)1/01/01/01/01/0
Component Input