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TX-28/25LD4P Service Manual
Safety
Specifications
Parts List
Service
Information
Adjustments
Self Check
Service Hints
Mechanical
View
Disassembly
Location of
Controls
Waveforms
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
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Summary of Contents for Panasonic TX-28LD4P
- Page 1 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 E - Schematic H - Schematic E - PCB Y - PCB N - Schematic Y - Schematic BACK BACK...
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Page 3: Specifications
ORDER No. SM-98032 Colour Television TX-28LD4P TX-25LD4P EURO4 Chassis SPECIFICATIONS (Information in brackets { } refers to model TX-25LD4P) AV2 IN Video (21 pin) 1V p-p 75Ω Power Source: 220-240V AC, 50Hz Audio (21 pin) 500mV rms 10kΩ S-Video IN Y: 1V p-p 75Ω... -
Page 4: Table Of Contents
CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 ADJUSTMENT PROCEDURE..............................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 ...............................22 CONDUCTOR VIEWS................................26 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the The potential at any point should not exceed AC supply before servicing a hot chassis. -
Page 5: Service Hints
SERVICE HINTS HOW TO REMOVE THE REAR COVER Remove the 12 screws as shown in Fig.2. SCREWS Fig.2. LOCATION OF CONTROLS Focus N - Board Screen E - Board H - Board Y - Board Fig.3. -
Page 6: Adjustment Procedure
ADJUSTMENT PROCEDURE The remote control is used for entering and storing adjustments, with the exception of Cut-off adjustments, which must always be done prior to service adjustment. Perform adjustments in accordance with screen display. The display on the screen also specifies the software version as well as the approx. setting values. The adjustment sequence for the service mode is indicated below. -
Page 7: Adjustment Procedure And Self-Check
ADJUSTMENT PROCEDURE Item / Preparation Adjustments +B SET-UP Set the +B voltage up as follows:- Adjust R811 so that B2 shows 148V±1V Receive a Greyscale signal. Confirm the following voltages. Set the controls :- ± 0,25V ± 0,25V 12 ± 0,5V 33 ±... -
Page 8: Waveform Pattern Table
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 64µS HFLB HFLB Video Out... -
Page 9: Alignment Settings
ALIGNMENT SETTINGS (The figures below are nominal and used for representative purposes only.) Alignment Function Settings / Special features H-Pos Horizontal Position Optimum setting. V-Pos Vertical Position Optimum setting. H-Amp Horizontal Amplitude Optimum setting. V-Amp Vert. Amplitude Optimum setting. E/W-Amp1 EW-amplitude Optimum setting. -
Page 10: Block Diagrams
VIDEO BLOCK DIAGRAM Y - BOARD E - BOARD Q906 Q908 COILS Q905 Q907 Q909 IC601 61 V IN 1 Q950 Q951 TUNER Q104 IC351 SVM OUT 34 VIDEO PROCESSOR B OUT 39 Q353 Q305 Q306 43 B IN Q105 OUTPUT 42 G IN G OUT 38... -
Page 11: Audio Block Diagram
AUDIO BLOCK DIAGRAM E - BOARD TUNER IC251 IC2101 AUDIO AUDIO OUTPUT PROCESSOR Q103 DACM_R 24 Q2102 Q252 HEADPHONE DACM_L 25 L 11 Q2103 Q251 SC3_IN_L 37 SC3_IN_R 38 Q101 44 MONO IN 1 R OUT SC1_OUT_R 30 2 R IN SC1_IN_R 42 49 ANA_IN2+ SC1_OUT_L 31... - Page 12 CONTROL BLOCK DIAGRAM E - BOARD H - BOARD TUNER IC3401 VIDEO IC2101 SWITCHING AUDIO Q3401 IC601 SDA 1 PROCESSOR VIDEO PROCESSOR SCL 1 SERVICE / TEST SDA 1 SCL 1 SDA 2 SCL 2 VPROT Q451 LOCAL KEYSCAN KEYS SWITCH IC1101 IC1103...
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Page 13: Power Supply Block Diagram
POWER SUPPLY BLOCK DIAGRAM E - BOARD 5V SBY Q852 D867 Q855 Q253 D868 Q853 Q854 IC251 Y - BOARD AUDIO D862 T802 RL801 OUTPUT R854 IC351 T801 D801 Line Filter T551 OUTPUT 150V 200V D850 R802 Q850 DEGAUSS COIL -14V IC451 TUNER... -
Page 14: Parts Location
PARTS LOCATION NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List. -
Page 15: Replacement Parts List
AUDIO PROCESSOR EASG15S505A2 SPEAKER IC3401 TEA2114 AV SWITCHING ENG27507G TUNER FUSES EUR511200 REMOTE CONTROL F802 19181-3.15 FUSE TBM8E1728 PANASONIC BADGE F8021 EYF52BC FUSE HOLDER TBX8E050 POWER BUTTON F8022 EYF52BC FUSE HOLDER TKP8E1222 REAR AV COVER DIODES TKP8E1223 DOOR LID TMX8E020... - Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description D803 1SR124-4AT82 DIODE Q503 2SD2398-M2 TRANSISTOR D804 1SR124-4AT82 DIODE Q551 BU2508AXLB TRANSISTOR D805 TLP621GR-LF2 PHOTO COUPLER Q552 2SC1473-RN TRANSISTOR Q701 BC857B TRANSISTOR D806 1SR124-4AT82 DIODE D850 RU4BLF-L1 DIODE Q850 2SD1273PLB TRANSISTOR D851 MTZJT776.2B...
- Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description L853 EXCELSA35T COIL JA58 ERJ6GEY0R00 S.M.CARB 0.1W L854 EXCELSA35T COIL JA57 ERJ6GEY0R00 S.M.CARB 0.1W L855 EXCELSA35T COIL JSE4 ERJ6GEY0R00 S.M.CARB 0.1W L856 EXCELSA39V COIL JA55 ERJ6GEY0R00 S.M.CARB 0.1W L901 EXCELSA24T COIL JSE5 ERJ6GEY0R00...
- Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description R301 ERJ6GEYJ391 S.M.CARB 0.1W R601 ERJ6GEYJ101 S.M.CARB 0.1W R302 ERJ6GEYJ102 S.M.CARB 0.1W R602 ERJ6GEYJ821 S.M.CARB 0.1W R303 ERJ6GEYJ750 S.M.CARB 0.1W R603 ERJ8GEYJ103 S.M.CARB .125W R304 ERJ6GEYJ331 S.M.CARB 0.1W R604 ERJ6GEYJ101 S.M.CARB 0.1W R305...
- Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R870 ERJ6GEYJ272 S.M.CARB 0.1W R1133 ERJ6GEYJ273 S.M.CARB 0.1W R871 ERJ6GEYJ153 S.M.CARB 0.1W R1136 ERJ6GEYJ823 S.M.CARB 0.1W R872 ERG1SJ183 METAL R1137 ERJ6GEY0R00 S.M.CARB 0.1W R873 ERG1SJ223 METAL R1138 ERJ6GEYJ474 S.M.CARB 0.1W 470K R874 ERD25TJ104...
- Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description 10nF R3002 ERJ6GEYJ471 S.M.CARB 0.1W C111 ECA1HMR33GB ELECT 10nF R3003 ERJ6GEYJ101 S.M.CARB 0.1W C117 ECUV1H103ZFX S.M. CAP 100nF R3004 ERJ6GEYJ153 S.M.CARB 0.1W C118 ECJ2VF1H104Z ELECT 350V 220µF R3005 ERJ6GEYJ101 S.M.CARB 0.1W C119 ECA1CM221GB...
- Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description 20µF 470pF C564 ECEA2AU2R2 ELECT 100V C853 ECKC2H471J CERAMIC 500V 20µF 100µF C565 ECQP1H273J FILM 100V C854 ECA1EM102GB ELECT 470pF 470pF C566 ECKC2H471J CERAMIC 500V C855 ECKC2H471J CERAMIC 500V 470pF 470pF C567 ECA1EHG102B...
- Page 22 C3017 ECA1CM470GB ELECT 1.5nF C551 ECKC3D152J CERAMIC 560pF C3019 ECUV1H561JCX S.M. CAP 470nF C3020 ECJ3VB1C474K ELECT 3.5KV DIFFERENCES FOR MODEL TX-28LD4P 2.2nF C3021 ECUV1H222JCX S.M. CAP 2.2nF C3022 ECUV1H222JCX S.M. CAP 2.2nF MECHANICAL PARTS C3023 ECUV1H222JCX S.M. CAP 47µF C3024...
- Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description TNP8EY012AF Y P.C.B. MISCELLANEOUS COMPONENTS TPC8E4659 OUTER CARTON TPD8E655 TOP CUSHION TPD8E656 BOTTOM CUSHION I.C.s IC1103 XGL2-01AP EAROM * CAPACITORS 1.2nF C551 ECKC3D122J CERAMIC...
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Page 24: Schematic Diagrams
SCHEMATIC DIAGRAMS FOR MODELS TX-28LD4P / TX-25LD4P (EURO-4 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 29 CONDUCTOR VIEWS E - BOARD TNP8EE009 TRAN’S DIODES D558 Q3601 L8 D3103 B7 D557 Q3007 M9 D3101 B7 D556 Q3001 N8 D3102 B7 D555 Q3006 N10 D2161 G9 D554 Q2304 I7 D2105 G10 D553 Q2303 M6 D2104 F9 D552 Q2301 I7 D2103 G10 D551 Q2103 I8...
- Page 30 Y - BOARD TNP8EY012 TRANSISTORS Q909 Q908 Q907 Q906 Q905 Q354 Q353 Q352 Q351 DIODES D906 D905 D904 D902 D901 D364 D363 D362 D361 D360 D359 D358 D357 D356 D355 D354 TEST POINTS TPY6 B8 TPY5 D5 TPY4 E5 TPY3 F6 TPY2 E7 TPY1 G6 IC’S...
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