Panasonic TX-28XD90P Service Manual
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Panasonic TX-28XD90P Service Manual

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TX-28/25XD90P
Safety
Specifications
Parts List
Service
Information
Adjustments
Self Check
Service Hints
Mechanical
View
Disassembly
Location of
Controls
Waveforms

Service Manual

/A/B
Block Diagrams
Schematic Diagrams
PCB Views
Service Support
Service and repair of
this product is
supported by
Panasonic's LUCI
interface.
This interface provides a
link between the TV and
a standard PC to allow a
number of diagnostic
and control functions to
be performed.
For more details contact
your local Panasonic
company.
EXIT
BACK

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Summary of Contents for Panasonic TX-28XD90P

  • Page 1: Service Manual

    PC to allow a Schematic Diagrams Self Check number of diagnostic and control functions to Service Hints be performed. Mechanical For more details contact View your local Panasonic company. Disassembly PCB Views Location of Controls EXIT BACK Waveforms...
  • Page 2 Audio Control Power supply Video BACK D - PCB E - PCB D - Schematic E - Schematic F - PCBs H - PCB F - Schematic H - Schematic M - PCB Y - PCB M - Schematic Y - Schematic BACK BACK...

  • Page 3: Colour Television

    ORDER No. SM-98086 Colour Television TX-28XD90P /A /B TX-25XD90P /A /B EURO - 5 Chassis SPECIFICATIONS (Information in brackets { } refer to TX-25XD90P /A /B) AV2 IN Video (21 pin) 1V p-p 75Ω Power Source: 220-240V AC, 50Hz Audio (21 pin) 500mV rms 10kΩ...

  • Page 4: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 SERVICE POSITION.................................4 ADJUSTMENT PROCEDURE AND SELF-CHECK ........................5 WAVEFORM PATTERN TABLE ...............................6 ALIGNMENT SETTINGS................................7 BLOCK DIAGRAMS ..................................8 PARTS LOCATION .................................12 REPLACEMENT PARTS LIST ..............................13 SCHEMATIC DIAGRAMS ...............................28 CONDUCTOR VIEWS................................34 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the The potential at any point should not exceed a.c.

  • Page 5: Service Hints

    SERVICE HINTS How to remove the rear cover 1. Remove the 11 screws as shown in Fig.2. Screws Fig.2. LOCATION OF CONTROLS Y Board Focus Screen E Board D Board M Board F Board H Board Fig.3.

  • Page 6: Service Position

    HOW TO MOVE THE CHASSIS INTO SERVICE POSITION 1. Hold and lift the rear of the chassis and gently pull the chassis toward you, as shown in Fig.4. 2. Release the respective wiring clips and rotate the chassis vertically through 90°, clockwise. 3.

  • Page 7: Adjustment Procedure

    ADJUSTMENT PROCEDURE Item / Preparation Adjustments +B SET-UP 1. Confirm the following voltages. D-Board E-Board Receive a Greyscale signal. PIN5 147V ± 3V E19-PIN8 ± 0,5V Set the controls :- PIN5 5V ± 0,3V IC3801-PIN3 9V ± 0,5V Brightness Minimum PIN1 40V ±...

  • Page 8: Waveform Pattern Table

    WAVEFORM PATTERN TABLE NOTE: All waveforms have been taken using a standard colour bar pattern. Vert Drive VFLB Vert Out IC451 Pin 2 IC451 Pin 5 IC601 Pin 1 8.6ms 8.6ms H - Out HFLB Video In IC601 Pin 8 IC601 Pin 13 IC1101 Pin 68 64µs...

  • Page 9: Alignment Settings

    ALIGNMENT SETTINGS: (The figures below are nominal and used for representative purposes only.) 1. Set the Bass to maximum position, set the Treble to minimum position, press the down button (- / v) on the customer controls at the front of the TV and at the same time press the INDEX button on the remote control, this will place the TV into the Service Mode.
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  • Page 14: Parts Location

    PARTS LOCATION NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List.
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  • Page 29 NOTES...

  • Page 30: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-28XD90P /A /B TX-25XD90P /A /B (EURO - 5 CHASSIS) IMPORTANT SAFETY NOTICE Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturer's specified parts. NOTE RESISTOR All resistors are carbon ¼W resistor, unless marked otherwise.

  • Page 37: Conductor Views

    CONDUCTOR VIEWS E - BOARD TNPH0176 TRAN’S DIODE’S Q101 D001 D2364 A6 Q103 D002 D3005 B1 Q104 D252 D3006 B2 Q251 D253 D3008 B4 Q252 D254 D3009 A3 Q253 D255 D3010 A3 Q254 D256 D3011 B1 Q281 D281 D3803 A5 Q282 D282 D3804 A5...
  • Page 38 Y - BOARD TNPA1353 TRAN’S Q901 Q902 Q903 Q904 Q906 Q908 Q909 Q3351 A2 Q3352 A2 DIODE’S D351 D352 D361 D362 D371 D372 D373 D374 D375 D387 D901 D902 D903 D910 D911 D3351 A2 D3352 A3 D3353 A1 D3354 C3 T.P.’S TPY1 TPY2...
  • Page 39 D - BOARD TNPA1014 DIODE’S TRAN’S D503 Q502 D504 Q552 D505 Q553 D551 Q554 D556 Q701 D559 Q801 D560 Q803 D561 Q804 D563 Q845 D565 Q846 D566 Q847 D571 Q848 D575 Q849 D701 Q850 D803 Q852 D807 Q853 D808 Q854 D809 D810 I.C.’S...
  • Page 40 H - BOARD TNPA1047 TRAN’S Q2401 A2 Q2407 A3 Q2408 A3 Q2409 A3 Q2410 A3 Q2411 A3 Q2412 A3 Q3401 B1 Q3402 C1 Q3403 B1 Q3404 C1 Q3405 C3 Q3406 C3 DIODE’S D2401 A2 D2403 A3 D2404 A3 D2405 A3 D2406 A3 D2407 A3 D2408 A3...
  • Page 41 F - BOARD TNPA1068 TRAN’S Q1663 B2 Q1664 B2 Q1665 B2 Q1666 C1 Q1667 C1 I.C.’S IC1502 B3 IC1503 C3 IC1504 D1 IC1505 D2 IC1506 C2 IC1509 C1 IC1510 C1...
  • Page 42 F - BOARD TNPA1068 TRAN’S Q1501 D3 Q1502 C3 Q1503 B2 Q1504 C1 Q1505 C1 Q1506 C1 Q1507 C1 Q1508 C1 Q1509 C1 Q1510 D1 Q1511 D1 Q1519 D1 Q1660 C2 Q1661 C2 Q1662 C2 I.C.’S IC1507 B2...
  • Page 43 M - BOARD TNP8EM015 TRAN’S Q1011 A1 Q1012 A2 DIODE’S D1011 A1 I.C.’S IC1011 A1...

This manual is also suitable for:

Tx-25xd90pTx-28xd90p/aTx-25xd90p/aTx-25xd90p/b

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