Panasonic TX-28PK25 Service Manual
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Panasonic TX-28PK25 Service Manual

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SPECIFICATIONS
Power Source:
Power Consumption:
Stand-by Power
Consumption:
Aerial Impedance:
Receiving System:
Receiving Channels:
Intermediate Frequency:
Video/Audio
Video
Audio
Colour
Video/Audio Terminals:
AUDIO MONITOR OUT
AV1 IN
AV1 OUT
AV2 IN
AV2 OUT
All manuals and user guides at all-guides.com
220-240V a.c., 50Hz
128W
1.4W
75Ω unbalanced, Coaxial Type
PAL-I , PAL-525/60 UHF
M.NTSC
NTSC (AV only)
UHF E21-E69
39.5MHz
33.5MHz
32.95MHz (NICAM)
35.07MHz (PAL)
Audio (RCAx2) 500mV rms 1kΩ
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 10kΩ
RGB (21 pin)
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 1kΩ
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 10kΩ
S-Video IN
Y: 1V p-p 75Ω
(21-pin)
C:0,3V p-p 75Ω
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 1kΩ
Selectable output (21 pin)
Colour Television
TX-28PK25
EURO-4H Chassis
AV3 IN
S-Video IN
(4-pin)
Audio (RCAx2)
Video (RCAx1)
AV4 IN
Video (21 pin)
Audio (21 pin)
S-Video IN
(21-pin)
RGB (21 pin)
AV4 OUT
Video (21 pin)
Audio (21 pin)
30.5kV ± 1kV
High Voltage:
Picture Tube:
W66EKT10X71 66cm
Audio Output:
2 x 15W (Music Power)
8Ω Impedance
Headphones:
8Ω Impedance
3.5mm
Accessories
supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height:
503mm
Width:
720mm
Depth:
527mm
Net weight:
43kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
NOTE: This Service Manual should be used in conjunction with
the EURO-4H Technical guide.
ORDER No. SM-01023
Y: 1V p-p 75Ω
C: 0,3V p-p 75Ω
500mV rms 10kΩ
1V p-p 75Ω
1V p-p 75Ω
500mV rms 10kΩ
Y: 1V p-p 75Ω
C: 0.3V p-p 75Ω
1V p-p 75Ω
500mV rms 1kΩ

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Summary of Contents for Panasonic TX-28PK25

  • Page 1 All manuals and user guides at all-guides.com ORDER No. SM-01023 Colour Television TX-28PK25 EURO-4H Chassis SPECIFICATIONS Power Source: 220-240V a.c., 50Hz AV3 IN S-Video IN Y: 1V p-p 75Ω (4-pin) C: 0,3V p-p 75Ω Power Consumption: 128W Audio (RCAx2) 500mV rms 10kΩ...
  • Page 2 3. Connect the ferrite bead supplied between the earth pad of JK2301and the audio earth of AV1 (Pin 4). Safety Notice ! : The ferrite bead must be glued in place CHIP JUMPER C2303 JK2301 AV1 (PIN 4) Panasonic Document No:QUA0011 ISSUE:2...

  • Page 3: Table Of Contents

    All manuals and user guides at all-guides.com CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 ADJUSTMENT PROCEDURE AND FACTORY SETTINGS .....................4 WAVEFORM PATTERN TABLE ...............................5 ALIGNMENT SETTINGS................................6 BLOCK DIAGRAMS ..................................7 PARTS LOCATION .................................11 REPLACEMENT PARTS LIST ..............................12 SCHEMATIC DIAGRAMS ...............................24 CONDUCTOR VIEWS................................31 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the...

  • Page 4: Service Hints

    All manuals and user guides at all-guides.com SERVICE HINTS How to remove the rear cover 1. Remove the 10 screws as shown in Fig.2. SCREWS SCREWS Fig.2. Abb.2. Fig. 2. LOCATION OF CONTROLS P-Board Y-Board M-Board M-Board D-Board Z-Board E-Board P-Board F-Board Focus...

  • Page 5: Adjustment Procedure And Factory Settings

    All manuals and user guides at all-guides.com ADJUSTMENT PROCEDURE Item / Preparation Adjustments Set the +B voltage up as follows:- +B SET-UP Adjust R811 so that B2 shows 148V±1V. Receive a Greyscale signal. Confirm the following voltages. Set the controls :- ±...

  • Page 6: Waveform Pattern Table

    All manuals and user guides at all-guides.com WAVEFORM PATTERN TABLE Vert Drive VFLB Vert Out IC451 Pin 2 IC451 Pin 3 IC601 Pin 31 20mS 20mS 20mS H - Out H - Out H - Pulse IC601 Pin 50 IC701 Pin 5 Base Q503 64µS 64µS...

  • Page 7: Alignment Settings

    All manuals and user guides at all-guides.com ALIGNMENT SETTINGS (The figures below are nominal and used for representative purposes only.) Set the Bass to maximum position, set the Treble to minimum position, press the volume 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.

  • Page 8: Block Diagrams

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  • Page 12: Parts Location

    All manuals and user guides at all-guides.com PARTS LOCATION NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List.

  • Page 13: Replacement Parts List

    SPEAKER IC251 LA4282 AUDIO OUTPUT ENG27514G TUNER IC351 TDA6111Q-N4 RGB OUTPUT EUR511211 REMOTE CONTROL IC361 TDA6111Q-N4 RGB OUTPUT TBM8E2246 PANASONIC BADGE IC371 TDA6111Q-N4 RGB OUTPUT TBX8E068 POWER BUTTON IC381 TL431CLPM REGULATOR TKP8E1316 DOOR LID IC451 LA7845N VERTICAL OUTPUT TKU8E00470-1 BACK COVER...
  • Page 14 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description D502 1SR124-4AT82 DIODE D1105 MA165TA5 DIODE D511 MTZJ4.7C DIODE D1131 MTZJT-775.6C DIODE D553 1SR124-4AT82 DIODE D2101 MA723TA5 DIODE D554 1SR124-4AT82 DIODE D2102 MA723TA5 DIODE D556 MA165TA5...
  • Page 15 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description Q1511 BC857B TRANSISTOR L1502 ELESN2R2KA COIL Q1512 BC847B TRANSISTOR L1503 ELESN2R2KA COIL Q1513 BC847B TRANSISTOR L1504 ELESN2R2KA COIL Q1514 BC847B TRANSISTOR L1505 ELESN100KA COIL Q1515 BC847B...
  • Page 16 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description JA18 ERJ8GEY0R00 S.M.CARB .125W R259 ERJ6GEYJ180 S.M.CARB 0.1W JA19 ERJ6GEY0R00 S.M.CARB 0.1W R260 ERJ6GEYJ103 S.M.CARB 0.1W JA19 ERJ8GEY0R00 S.M.CARB .125W R261 ERJ6GEYJ471 S.M.CARB 0.1W JA20 ERJ6GEY0R00...
  • Page 17 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description R572 ERJ6GEYJ102 S.M.CARB 0.1W R869 ERJ6GEY0R00 S.M.CARB 0.1W R573 ERJ6GEYJ101 S.M.CARB 0.1W R870 ERJ6GEYJ272 S.M.CARB 0.1W R581 ERQ2CJP821 METAL R871 ERJ6GEYJ153 S.M.CARB 0.1W R583 ERG3FJ331 METAL...
  • Page 18 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description R1130 ERJ6GEYJ103 S.M.CARB 0.1W R1532 ERJ6GEYJ391 S.M.CARB 0.1W R1131 ERJ6GEYJ103 S.M.CARB 0.1W R1533 ERJ6GEYJ122 S.M.CARB 0.1W R1132 ERJ6GEYJ101 S.M.CARB 0.1W R1534 ERJ6GEYJ102 S.M.CARB 0.1W R1133 ERJ6GEYJ272...
  • Page 19 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description R2116 ERJ6GEYJ101 S.M.CARB 0.1W R3015 ERJ6GEYJ101 S.M.CARB 0.1W R2117 ERJ6GEYJ101 S.M.CARB 0.1W R3016 ERJ6GEYJ153 S.M.CARB 0.1W R2118 ERJ6GEYJ822 S.M.CARB 0.1W R3017 ERJ6GEYJ101 S.M.CARB 0.1W R2119 ERJ6GEYJ101...
  • Page 20 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description 470pF C109 ECUV1H102JCX S.M. CAP C557 ECKC2H471J CERAMIC 500V 10nF 470µF C110 ECJ2VF1H103Z CERAMIC C558 ECA1HHG471E ELECT 0.33µF 1000µF C111 ECA1HMR33GB ELECT C561 ECA1EHG102B ELECT 10nF...
  • Page 21 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description 100µF 10nF C869 ECA1EM101GB ELECT C1521 ECJ2VB1H103K CERAMIC 470µF 10µF C870 ECA1EM471GB ELECT C1522 ECEA1CKA100 ELECT 3300µF 10µF C871 ECEA1CU332 ELECT C1524 ECEA1CKA100 ELECT 470µF 10nF...
  • Page 22 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description 1.5nF 100nF C1613 ECJ2VB1H152K ELECT C2212 ECJ2VB1C104K CERAMIC 47nF 47nF C1614 ECJ2VB1H473K CERAMIC C2213 ECJ2YB1H473K CERAMIC 220nF 10nF C1615 ECJ2VB1C224K CERAMIC C2215 ECUV1H103KBX S.M.
  • Page 23 All manuals and user guides at all-guides.com Cct Ref Parts Number Description Cct Ref Parts Number Description 10nF C3213 ECUV1H103KBX S.M. CAP 100nF C3214 ECJ2VB1C104K CERAMIC 10nF C3215 ECUV1H103KBX S.M. CAP 33pF C3216 ECA1CM330GB ELECT 100nF C3217 ECJ2VB1C104K CERAMIC 220µF C3221 ECA1CM221GB ELECT...
  • Page 24 All manuals and user guides at all-guides.com NOTES...

  • Page 25: Schematic Diagrams

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  • Page 32: Conductor Views

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  • Page 34 All manuals and user guides at all-guides.com E– BOARD - TNP8EE016 DIODES D861 D251 D862 D253 D863 D254 D864 D453 D865 D454 D866 D456 D867 D457 D868 D458 D869 D501 D871 D502 D873 D511 D874 D553 D875 D554 D890 D555 D891 D556 D1101 B2...
  • Page 35 All manuals and user guides at all-guides.com Y – BOARD - TNP8EY018 TRAN’S Q351 Q361 Q371 Q905 Q906 Q907 Q908 Q909 Q3351 A2 Q3352 A2 DIODES D351 D352 D361 D362 D371 D372 D373 D374 D375 D376 D377 D378 D387 D901 D902 D903 D910...
  • Page 36 All manuals and user guides at all-guides.com D – BOARD - TNP8ED002 DIODES D802 D807 D808...
  • Page 37 All manuals and user guides at all-guides.com M – BOARD - TNP8EM021 TRANSISTORS Q1061 Q1062 Q3201 Q3202 Q3203 Q3204 Q3205 Q3206 Q3207 Q3208 Q3209 Q1900 DIODES D1061 D3201 D3202 D3203 D1900 IC’S IC1061 IC1900 IC1901...
  • Page 38 All manuals and user guides at all-guides.com Z – BOARD - TNP8EZ003 TRAN’S Q2201 Q2202 Q2203 IC’S IC2201 IC2221 IC2302...
  • Page 39 All manuals and user guides at all-guides.com F – BOARD - TNP8EF008 TRANSISTORS Q1510 D3 Q1502 C2 Q1511 D2 Q1503 C3 Q1512 D3 Q1504 C3 Q1513 D3 I.C.’s Q1505 E2 Q1506 E3 IC1502 B5 Q1507 E3 IC1503 D5 Q1508 D2 IC1504 D4 Q1509 D3...
  • Page 40 All manuals and user guides at all-guides.com P – BOARD - TNP8EP019 DIODES D3917 C2 D3901 C2 D3920 A1 D3907 B1 D3921 A1 I.C.’s D3908 B1 D3909 B1 IC3901 C1 D3910 B2 IC3902 A1 D3911 B2 TRANSISTORS D3912 B1 Q3905 B1 D3915 C2 Q3906 B1...

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