Panasonic TX-28LDM4F Service Manual
  1. Manuals
  2. Brands
  3. Panasonic Manuals
  4. TV
  5. TX-28LDM4F
  6. Service manual

Panasonic TX-28LDM4F Service Manual

Hide thumbs Also See for TX-28LDM4F:
Table of Contents

Advertisement

Quick Links

Download this manual
TX-28/25LDM4F 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
BACK

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the TX-28LDM4F and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Panasonic TX-28LDM4F

Summary of Contents for Panasonic TX-28LDM4F

  • 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...
  • Page 3 ORDER No. SM-98020 Colour Television TX-28LDM4F TX-25LDM4F EURO4 Chassis SPECIFICATIONS (Information in brackets { } refers to model TX-25LDM4F) 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 E - BOARD TUNER IC251 IC2101 AUDIO AUDIO OUTPUT PROCESSOR Q103 DACM_R 24 Q2102 Q252 X101 HEADPHONE DACM_L 25 L 11 Q2103 Q251 X102 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+...
  • Page 12 CONTROL BLOCK DIAGRAM E - BOARD H - BOARD TUNER POS/NEG IC3401 L/L’ VIDEO IC2101 SWITCHING AUDIO IC601 Q3401 SDA 1 PROCESSOR VIDEO PROCESSOR SCL 1 SERVICE / TEST SDA 1 SCL 1 SDA 2 SCL 2 VPROT Q451 LOCAL KEYSCAN KEYS SWITCH...
  • Page 13 POWER SUPPLY BLOCK DIAGRAM E - BOARD 5V SBY Q852 D867 Q855 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 V-OUTPUT...

  • 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

    19181-3.15 FUSE EASG15S505A2 SPEAKER F8021 EYF52BC FUSE HOLDER ENG29504G TUNER F8022 EYF52BC FUSE HOLDER EUR511200 REMOTE CONTROL DIODES TBM8E1728 PANASONIC BADGE TBX8E060 POWER BUTTON D101 MA3020TX DIODE TKP8E1222 REAR AV COVER D102 MA3020TX DIODE TKP8E1255 DOOR LID D251 MA2180TP DIODE...
  • Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description D804 1SR124-4AT82 DIODE Q451 BC857B TRANSISTOR D805 TLP621GR-LF2 PHOTO COUPLER Q503 2SD2398-M2 TRANSISTOR Q551 BU2508AXLB TRANSISTOR D806 1SR124-4AT82 DIODE D850 RU4BLF-L1 DIODE Q552 2SC1473-RN TRANSISTOR D851 MTZJT776.2B DIODE Q701 BC857B TRANSISTOR Q850 2SD1273PLB...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description L603 TLTACT4R7K COIL JSE12 ERJ6GEY0R00 S.M.CARB 0.1W L604 TLTACT4R7K COIL JA25 ERJ6GEY0R00 S.M.CARB 0.1W L606 TLTACT4R7K COIL ERJ6GEY0R00 S.M.CARB 0.1W L607 ELJFC2R2KF COIL JA28 ERJ6GEY0R00 S.M.CARB 0.1W L701 ELC10D822E COIL JA12 ERJ6GEY0R00 S.M.CARB...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description R263 ERJ6GEYJ473 S.M.CARB 0.1W R555 ERQ12HKR33 METAL 0.5W R264 ERJ6GEYJ103 S.M.CARB 0.1W R558 ERDS1TJ124 CARBON 0.5W 120K R265 ERD25TJ2R2 CARBON 0.25W R559 ERQ12HKR33 METAL 0.5W R266 ERD25TJ2R2 CARBON 0.25W R560 ERJ6GEYJ274 S.M.CARB 0.1W...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R859 ERJ6GEYJ753 S.M.CARB 0.1W R1121 ERJ6GEYJ101 S.M.CARB 0.1W R860 ERQ1CJP2R2 FUSIBLE 1W 10% R1122 ERD25TJ103 CARBON 0.25W R861 ERD25TJ221 CARBON 0.25W R1123 ERJ6GEYJ101 S.M.CARB 0.1W R862 ERD25TJ272 CARBON 0.25W R1125 ERJ6GEYJ472 S.M.CARB 0.1W...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description R2118 ERJ6GEYJ222 S.M.CARB 0.1W R3605 ERJ6GEYJ101 S.M.CARB 0.1W R2119 ERJ6GEYJ101 S.M.CARB 0.1W R3606 ERJ6GEYJ101 S.M.CARB 0.1W R2120 ERJ6GEYJ222 S.M.CARB 0.1W R3607 ERJ6GEYJ472 S.M.CARB 0.1W R2302 ERJ6GEYJ104 S.M.CARB 0.1W 100K R3608 ERJ6GEYJ752 S.M.CARB 0.1W...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description 10µF 10nF C455 ECA1HM100GB ELECT C702 ECUV1H103KBX S.M. CAP 220µF 10µF C703 ECEA1HGE100 ELECT C456 ECA1HHG221B ELECT 2.2nF 22nF C458 ECQB1222JF3 FILM 100V C704 ECQB1H223K FILM 2.2nF 2.2nF C459 222236516154 FILM 160V C705...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 470nF 47µF C1115 ECJ3VB1C474K ELECT 3.5KV C3010 ECA1CM470GB ELECT 4.7nF 560pF C1116 ECUV1H472KBX S.M. CAP C3012 ECUV1H561JCX S.M. CAP 100nF 470nF C1117 ECJ2VF1H104Z ELECT 350V C3013 ECJ3VB1C474K ELECT 3.5KV 10nF 2.2nF C1118 ECUV1H103KBX...
  • Page 23 OUTER CARTON TPD8E657 TOP CUSHION TPD8E658 BOTTOM CUSHION I.C.s IC1103 XGL2-04F EAROM * CAPACITORS 1.5nF C551 ECKC3D152J CERAMIC DIFFERENCES FOR MODEL TX-28LDM4F MECHANICAL PARTS TKU8E00320 BACK COVER A66ECF50X41 C.R.T. TKY8E304 CABINET TLK8E05140 DEGAUSS COIL TNP8EE009CF E P.C.B. TQF8E2680 MODEL LABEL...

  • Page 24: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-28LDM4F / TX-25LDM4F (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...

This manual is also suitable for:

Tx-25ldm4f

Table of Contents