Panasonic CT Z1425 Service Manual

ORDER NO. MTNC050310C3 B01

Service Manual

Color Television

Main Manual

Panasonic

Models

CT-Z1425

Chassis

TMC573

'CT-Z1425

This service manual is issued as a service guide for the model listed above. Included in this manual are a set of schematic, block diagrams, functional descriptions, alignment procedures, disassembly procedures and a complete parts list.

“WARNING! This Service Manual 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 Manual by anyone else could result in serious injury or death.”

The service technician is required to read and follow the “Safety Precautions” and “Important Safety Notice” in this Main Manual.

CONTENTS

CONTENTS .................................................................................................................................................

Important Safety Notice ............................................................................................................................

Service Notes.............................................................................................................................................

About lead free solder (PbF) ....................................................................................................................

GENERAL SPECIFICATIONS ...................................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP ............................................................................................................

2. NOTE FOR THE REMOVAL OF THE MAIN PCB............................................................................

SERVICE MODE LIST ................................................................................................................................

CONFIRMATION OF HOURS USED .........................................................................................................

WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................................

ELECTRICAL ADJUSTMENTS

1. BEFORE MAKING ELECTRICAL ADJUSTMENTS .........................................................................

2. BASIC ADJUSTMENTS ....................................................................................................................

3. PURITY AND CONVERGENCE ADJUSTMENTS ...........................................................................

4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)...................

BLOCK DIAGRAM......................................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN/CRT ..............................................................................................................................................

SCHEMATIC DIAGRAMS

MICON/CHROMA/TUNER .....................................................................................................................

TV POWER ............................................................................................................................................

DEFLECTION/CRT ................................................................................................................................

SOUND/AV .............................................................................................................................................

VOLTAGE LIST ..........................................................................................................................................

WAVEFORMS .............................................................................................................................................

MECHANICAL EXPLODED VIEW .............................................................................................................

MECHANICAL REPLACEMENT PARTS LIST .........................................................................................

ELECTRICAL REPLACEMENT PARTS LIST...........................................................................................

A1-1 A2-1 A2-2, A2-3 A2-4 A3-1~A3-5

B-1 B-1 C-1 C-1 C-1

D-1 D-1, D-2 D-3 D-4 E-1, E-2

F-1~F-4 G-1, G-2

G-3, G-4 G-5, G-6 G-7, G-8 H-1 I-1, I-2 J-1 K1-1 K2-1~K2-3

A1-1

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 symbol

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.

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, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. 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 picture tube 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 X-ray 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 capable of handling 50kV without causing X-ray 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.

and printed in BOLD TYPE on the replacement part list. It is essential that

Safety Precautions

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 240k 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 1.5k

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.

TO INSTRUMENT’S EXPOSED METAL PARTS

X-ray Radiation

WARNING: The potential source of X-ray radiation in

the TV set is in the High Voltage section and the picture

Note:

Set the brightness and picture controls to Minimum. Measure the High Voltage. The high voltage should be

24.5

immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.

It is important to use an accurate, calibrated high voltage meter.

± 1.0kV. If the upper limit is out of tolerance,

and 5.2M . If the exposed metallic

10 watt resistor in parallel with a

AC VOLTMETER

COLD WATER PIPE (GROUND)

0.15µF

1500 ,10 W

Figure 1.

Hot Check Circuit

A2-1

Service Notes

These components are affixed with glue. Be careful not to break or damage any foil under the

Note:

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 1.6k

resistor, 0 = 0 (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

Use solder wick to remove solder from component end

caps or terminal.

Without pulling up, carefully twist the component with tweezers to break the adhesive.

Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.

Chip Component Installation

1.2.Put a small amount of solder on the board soldering

pads. 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

TYPE

ANODES

TRANSISTOR

GRADE

COMMON CATHODE

SOLDER CAPS

CAPACITOR

1ST DIGIT

RESISTORMH DIODE

SOLDER CAPS

2ND DIGIT

MULTIPLIER =1600 = 1.6k

A2-2

How to Replace Flat-IC

- Required Tools -

Soldering iron De-solder braids Needle nose pliers Magnifier Wire cutters (sharp & small)

Cut the pins of a defective IC with wire cutters. Remove IC from board. If IC is glued to the board, heat the IC and release the IC. See Note above.

Flat IC

Using soldering iron and needle nose pliers remove the IC pins from the board.

Soldering Iron

Using de-soldering braid and soldering iron remove solder from affected are on board (pads).

De-soldering Braid

Soldering Iron

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). Determine the positions of the soldering pads and pins by correctly aligning the polarity symbol. Solder pin #1 first, align the IC.

Polarity symbol

Solder the pin opposite to pin #1. This will assist positioning the IC.

Solder all pins to the soldering pads using a fine tipped soldering iron.

Solder

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.

Solder Bridge

2nd solder

De-Solder Braid

1st solder

Soldering Iron

Soldering lron

Service Notes (Continued)

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 ( servicing, or incorrect voltages will be measured.

) or ( ) when

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 symbol

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.

For optimum performance and reliability, all other parts should be replaced with components of identical specification.

on the schematic

A2-3

About lead free solder (PbF)

component

A2-4

+ Cu(Copper).

There are several kinds of Pb free solder available for purchase. Although, this product can be used only Sn+Ag+Cu(tin, silver, copper) solder

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. TheLeadFreeSolderusedinourmanufacturingprocessanddiscussedbelowisSn(Tin)+Ag(Silver)

ThismodelusesPbFreesolderinit’smanufactureduetoenvironmentalconservationissues.

PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the front ofPCB.

Caution

• Pb free solder has a higher melting point than standard solder. Typically the melting pointis30~40°C higher.Pleaseuseahightemperaturesolderingiron andsetitto350± 5°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)

Suggested Pb free solder

0.3mm X 100g

remove all of the

excess solder

component

slice view

solder

0.6mm X 100g 1.0mm X 100g

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 13 inch / 335.4mmV

System CRT Type Normal

Deflection

Magnetic Field BV/BH +0.35G/0.18G Color System NTSC Speaker 1Speaker

Position Front

Size

Impedance 8 ohm Sound Output MAX

10%(Typical) NTSC3.58+4.43 /PAL60Hz No

G-2 Tuning Broadcasting System US System M

System Tuner and System 1Tuner

Receive CH Destination USA(W/ CATV)

Tuning System F-Synth

Input Impedance VHF/UHF 75 ohm

CH Coverage A - I, J - W, W+1 - W+84 Intermediate Picture(FP) 45.75MHz Frequency Sound(FS) 41.25MHz

FP-FS 4.50MHz Preset CH Stereo/Dual TV Sound Tuner Sound Muting Yes

G-3 Power Power Source AC 120V AC 60Hz

DC Power Consumption at AC

Stand by (at AC)

Per Year Protector Power Fuse Yes

G-4 Regulation Safety UL

Radiation FCC

X-Radiation DHHS

G-5 Temperature Operation 0oC ~ +40oC

Storage -20oC ~ +60oC

G-6 Operating Humidity Less than 80% RH

90 degree

1.5 2.5 Inch

1.0 W

0.8 W

2 - 69, 4A, A-5 - A-1,

No No

54 W at AC 120 V 60 Hz 3 W at AC 120 V 60 Hz

-- kWh/Year

A3-1

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

Display Menu Type Picture(Matsusita Type)

G-8 OSD Language English French Spanish

Picture Yes

Contrast(Picture) Yes

Brightness Yes

Color Yes

Tint Yes

Sharpness Yes

Normal Yes

Audio No

Bass No

Treble No

Balance No

BBE On/Off No

Stable Sound On/Off No

SET UP Yes

Language Yes

Mode Yes

Auto Program Yes

Manual Program Yes

CC Yes

Timer Yes Lock Yes Exit Yes

CH Label No

Favorite CH No

Color Stream DVD/DTV No

Control Level Yes

Sound Yes

Brightness Yes

Contrast(Picture) Yes

Color Yes

Tint Yes

Sharpness Yes

Tuning No

Bass No

Treble No

Balance No

Back Light No

Stereo,Audio Output,SAP No Video(Aux) Yes Color Stream No Channel(TV/Cable) Yes CH Label No Sound Mute Yes V-chip Rating Yes

G-9 Clock and Sleep Timer Max Time 120 Min

Timer Step

On/Off Timer Program(On Tim / Off Tim) Wake Up Timer Timer Back-up (at Power Off Mode) more than -- Min Sec

10 Min

A3-2

No No

GENERAL SPECIFICATIONS

G-10 Remote Unit RC-GP

Control Glow in Dark Remocon No

G-11 Features Auto Degauss Yes

Format KASEIKYO Custom Code Power Source Voltage(D.C) 3V

UM size x pcs UM-3(AA) x 2 pcs Total Keys Keys Power Yes

1 Yes

2 Yes

3 Yes

4 Yes

5 Yes

6 Yes

7 Yes

8 Yes

9 Yes

0 Yes

100 No

CH Up(UP) Yes

CH Down(DOWN) Yes

Volume Up(Right) Yes

Volume Down(Left) Yes

TV/Caption/Text No

CH1/CH2 No

TV/Video(TV/AV) Yes

CH RTN/CH ENT(Quick View) Yes

Sleep No

RE Call(Call) Yes

Reset No

Menu No

Enter No

Mute Yes

Action Yes

Exit No

MTS(Audio Select) No

Set + No

Set - No

Auto Shut Off Yes Canal+ No CATV Yes Anti-theft No Rental No Memory(Last CH) Yes Memory(Last Volume) Yes V-Chip Yes

Type BBE No Auto Search No CH Allocation No SAP No Just Clock Function No CH Label No VM Circuit No Full OSD No Premiere No Comb Filter No

Auto CH Memory Yes Hotel Lock No Closed Caption Yes Stable Sound No FBT Leak Test Protect Yes CH Lock No Video Lock No Game Timer No Power On Memory Yes Energy Star Yes Favorite CH No

08-00 h

20 Keys

USA,ORION Type

Lines

A3-3

GENERAL SPECIFICATIONS

G-12 Accessories Owner's Manual Language Spanish

Remote Control Unit Yes Rod Antenna Yes

Loop Antenna

U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Facility List Important Safety Instruction Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Battery Yes

AC Cord AV Cord (2Pin-1Pin) Registration Card (NDL Card) ESP Card PTB Sheet 300 ohm to 75 ohm Antenna Adapter

G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power No

Terminals Front Video Input

Rear Video Input(Rear1)

G-14 Set Size Approx. W x D x H (mm) G-15 Weight Net (Approx.) 9.5 kg

G-16 Carton Master Carton

Gift Box Yes

Drop Test

Container Stuffing

W/ Warranty

Poles 1Poles

Terminal

Terminal -

UM size x pcs UM3(AA) x 2

OEM Brand Yes

System Select No

Main Power SW No

Sub Power No

CH Up(UP) Yes

CH Down(DOWN) Yes

Volume Up(Right) Yes

Volume Down(Left) Yes

ACTION=Volume Up+Volume Down Yes

TV/CATV Selector No

Degauss No

Main Power SW No

Stand-by No

On Timer No

Audio Input

Other Terminal

Video Input(Rear2)

Audio Input(Rear1)

Audio Input(Rear2)

Video Output

Audio Output

Euro Scart

Color Stream

Diversity No

Ext Speaker No

DC Jack 12V(Center +) No

VHF/UHF Antenna Input

AC Outlet No

Gross (Approx.) 11.0kg

Content

Material

Dimensions W x D x H(mm)

Description of Origin

Material Double/White

Dimensions W x D x H(mm)

Design As per Buyer's

Description of Origin Yes

Height (cm) 62

RCA RCA x 1 Ear Phone

F Type

359.4 x 354 x 337

----

-- x -- x --

440 x 408 x 396

Natural Dropping At 1 Corner / 3 Edges / 6

725

No No No No No No No No No No No

No No No No No No

No No No No No No No No

( 20.9 lbs) ( 24.4lbs) No Sets /--

Surfaces

Sets/40' container

A3-4

+ 23 hidden pages