Panasonic TX-28MD4 Service Manual
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Panasonic TX-28MD4 Service Manual

Panasonic TX-28MD4 Service Manual

Euro4 chassis
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TX-28/25/21MD4 Service Manual
Safety
Specifications
Parts List
Service
Information
Adjustments
Self Check
Service Hints
Mechanical
View
Disassembly
Location of
Controls
Waveforms
Supplementary Information
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-28MD4

  • 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 Supplementary Information...
  • Page 2 Audio Control Power supply Video BACK E - Schematics H - Schematic E - PCB Y - PCBs Y - Schematics BACK BACK...
  • Page 3 Specifications are subject to change without notice. Weights and dimensions shown are approximate. NOTE: This Service Manual should be used in conjunction with the EURO4 Technical guide. Panasonic CS ( U.K. ) Ltd. WILLOUGHBY ROAD, BRACKNELL, BERKS., RG12 8FT. 3DQDVRQLF...

  • Page 4: Table Of Contents

    Set the brightness to minimum. 20M ohm. When the exposed metal does not have a Measure the high voltage. The meter should indicate. return path to the chassis, the reading must be TX-28MD4 28,5kV ± 1kV. infinite. TX-25MD4 28,2kV ±...

  • Page 5: Service Hints

    SERVICE HINTS How to remove the rear cover Remove the 9 screws as shown in Fig.2. SCREWS Fig.2. LOCATION OF CONTROLS FOCUS SCREEN E-BOARD H-BOARD Y-BOARD Fig.3.

  • Page 6: Service Position

    HOW TO MOVE THE CHASSIS INTO SERVICE POSITION Remove the bead clamper from the mains lead and attach to the degauss coil, shown in Fig.5. Hold and lift the rear of the E-PCB chassis and gently pull the chassis toward you, as shown in Fig.4. Release the respective wiring clips and rotate the chassis horizontally through 90°, anti-clockwise.

  • Page 7: 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 8: 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 [130V±1V Receive a Greyscale signal. TX-21MD4] Set the controls :- Confirm the following voltages. ± 0,25V ± 0,25V Brightness Minimum 12 ±...

  • Page 9: Waveform Pattern Table

    WAVEFORM PATTERN TABLE VFLB Vert Drive Vert Out IC451 Pin 3 IC451 Pin 2 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 10: 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 11: Block Diagrams

    VIDEO BLOCK DIAGRAM E - BOARD Y - BOARD TX-28MD4 TX-25MD4 Q906 Q908 COILS ONLY TX-28MD4 TX-25MD4 Q905 Q907 Q909 ONLY IC601 61 V IN 1 Q950 Q951 TUNER Q104 IC351 SVM OUT 34 VIDEO PROCESSOR B OUT 39 Q353...
  • Page 12 AUDIO BLOCK DIAGRAM E - BOARD TUNER IC251 IC2101 AUDIO AUDIO OUTPUT PROCESSOR DACM_R 24 Q2102 Q252 HEADPHONE DACM_L 25 Q2103 L 11 Q251 SC3_IN_L 37 SC3_IN_R 38 Q101 1 R OUT SC1_OUT_R 30 2 R IN SC1_IN_R 42 3 L OUT SC1_OUT_L 31 Q102 47 ANA_IN1+...
  • Page 13 CONTROL BLOCK DIAGRAM E - BOARD H - BOARD TUNER IC3401 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 IC1101 IC1103...
  • Page 14 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 15: Parts Location

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

  • Page 16: Replacement Parts List

    REPLACEMENT PARTS LIST Important Safety Notice Components Identified by mark have special characteristics important for safety. * When replacing any of these components, use only manufacturers specified parts. In case of ordering these spare parts, please always add the complete Model-Type number to your order.
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description Q1104 BC847B TRANSISTOR D854 TVSRU2AMLFA5 DIODE Q1105 BC847B TRANSISTOR D855 FML22SLF610 DIODE D856 RU4AMLF-M1 DIODE Q1106 BC847B TRANSISTOR D857 MTZJT-775.1C DIODE Q1107 BC847B TRANSISTOR D858 MA165TA5 DIODE Q1108 BC847B TRANSISTOR D859 MA165TA5 DIODE...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description R104 ERJ6GEYJ332 S.M.CARB 0.1W CRYSTALS R105 ERJ6GEYJ101 S.M.CARB 0.1W X601 4730007267 CRYSTAL R106 ERJ6GEYJ681 S.M.CARB 0.1W X1101 TSSA121 CRYSTAL R107 ERJ6GEYJ102 S.M.CARB 0.1W X2101 4730007158 CRYSTAL R111 ERJ6GEY0R00 S.M.CARB 0.1W RESISTORS R112 ERJ6GEYJ101...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R453 ERJ6GEY0R00 S.M.CARB 0.1W R806 ERD25TJ100 CARBON 0.25W R454 ERJ6GEYJ752 S.M.CARB 0.1W R807 ERD25TJ332 CARBON 0.25W R455 ERJ6GEYJ222 S.M.CARB 0.1W R809 ERD25TJ681 CARBON 0.25W R456 ERJ6GEYJ104 S.M.CARB 0.1W 100K R810 ERW2PKR33 WOUND 2W 20%...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description R1127 ERJ6GEYJ101 S.M.CARB 0.1W R2305 ERJ6GEYJ102 S.M.CARB 0.1W R1128 ERJ6GEYJ682 S.M.CARB 0.1W R2306 ERJ6GEYJ103 S.M.CARB 0.1W R1129 ERJ6GEYJ682 S.M.CARB 0.1W R2308 ERJ6GEYJ104 S.M.CARB 0.1W 100K R1130 ERJ6GEYJ103 S.M.CARB 0.1W R2309 ERJ6GEYJ101 S.M.CARB 0.1W...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description 470µF C560 ECA2GHG2R2B ELECT 400V CAPACITORS 470µF C561 ECA1EHG102B ELECT 10nF C102 ECUV1H103ZFX S.M. CAP 100pF C562 ECKC2H101J CERAMIC 500V 100nF C103 ECJ2VF1H104Z ELECT 350V 20µF C563 ECA2EHG220B ELECT 250V 56pF C106 ECUV1H560JCX...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 470pF 220pF C850 ECKC3D471JB CERAMIC C2118 ECUV1H221JCX S.M. CAP 220µF 220pF C851 ECA2CM221E ELECT 160V C2119 ECUV1H221JCX S.M. CAP 100µF 220pF C852 ECA2CHG101E ELECT 160V C2120 ECUV1H221JCX S.M. CAP 470pF 10µF C853 ECKC2H471J...
  • Page 23 100µF JSE28 ECUV1H104KBX S.M. CAP TNP8EE009AL E P.C.B. TERMINALS AND LINKS TQF8E2595 MODEL LABEL JK2301 JPJ841101320 RCA / HEADPHONE JACK TBM8E1728 PANASONIC BADGE JK3101 TJB16673 A.V. TERMINAL TBX8E042-1 POWER BUTTON SWITCHES TNP8EY012AD Y P.C.B. S801 ESB92S11B SWITCH MISCELLANEOUS COMPONENTS S1201...
  • Page 24 R923 ERD25TJ393 CARBON 0.25W 10µF C916 ECEA2CGE100 ELECT 160V R924 ERDS1FJ390 CARBON 0.5W R925 ERJ6GEY0R00 S.M.CARB 0.1W DIFFERENCES FOR MODEL TX-28MD4 R926 ERJ6GEY0R00 S.M.CARB 0.1W R927 ERD25TJ471 CARBON 0.25W MECHANICAL PARTS R928 ERD25TJ5R6 CARBON 0.25W TKU8E00350 BACK COVER R929 ERDS1FJ471 CARBON 0.5W...

  • Page 25: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-28MD4 / TX-25MD4 / TX-21MD4 (EURO-4 CHASSIS) IMPORTANT SAFETY NOTICE Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturers' specified parts. NOTE RESISTOR All resistors are carbon ¼W resistor, unless marked otherwise.
  • Page 31 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 32 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...
  • Page 33 Y - BOARD TNP8EY013 DIODES D354 D355 D356 D357 D358 D359 D360 D361 D362 D363 D364 TEST POINTS TPY1 TPY2 TPY3 TPY4 TPY5 TPY6 TRANSISTORS Q351 Q352 Q353 Q354 I.C.’S IC351...
  • Page 34 NOTES...
  • Page 35 ORDER No. SM-98051 Colour Television TX-28MD4 TX-25MD4 TX-21MD4 Additional information for Self-Check feature (Information in brackets {} refers to the TX-21MD4) FACTORY SETTINGS To return customer settings to factory settings and clear owner ID of all information input by the customer, enter Self-Check mode.
  • Page 36 This datasheet has been downloaded from: www.DatasheetCatalog.com Datasheets for electronic components.

This manual is also suitable for:

Tx-25md4Tx-21md4

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