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Panasonic TX-28MD4P Service Manual
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Panasonic TX-28MD4P Service Manual

Panasonic TX-28MD4P Service Manual

Euro4 chassis
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SPECIFICATIONS
(Information in brackets { } refers to model TX-25MD4P)
(Information in brackets [ ] refers to model TX-21MD4P)
Power Source:
Power Consumption:
Aerial Impedance:
Stand-by Power
Consumption:
Receiving System:
Receiving Channels:
VHF E2-E12
VHF A-H (ITALY)
VHF R3-R5
UHF E21-E69
CATV S1-S10 (M1-M10)
CATV S21-S41 (HYPERBAND)
Intermediate Frequency:
Video/Audio
Video
Audio
Colour
Terminals:
AUDIO MONITOR OUT
AV1 IN
AV1 OUT
220-240V AC, 50Hz
130W [115W]
75Ω unbalanced, Coaxial Type
1,8W
PAL B/G, H, D/K, PAL-525/60
SECAM B/G, D/K
M.NTSC
NTSC (AV only)
VHF H1-H2 (ITALY)
VHF R1-R2
VHF R6-R12
CATV (S01-S05)
CATV S11-S20 (U1-U10)
38,9MHz
33,4MHz, 33,16MHz
32,4MHz, 33,05MHz, 32,66MHz
34,47MHz (PAL)
34,5MHz, 34,65MHz (SECAM)
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
Colour Television
TX-28MD4P
TX-25MD4P
TX-21MD4P
EURO4 Chassis
AV2 IN
Video (21 pin)
Audio (21 pin)
S-Video IN
(21-pin)
AV2 OUT
Video (21 pin)
Audio (21 pin)
Selectable output (21 pin)
AV3 IN
Audio (RCAx2)
Video (RCAx1)
28,5kV ±1kV
High Voltage:
[28kV ±1kV]
Picture Tube:
A66ECF50X41
{A59ECF50X41
[A51ECQ51X01
Audio Output:
2 x 15W (Music Power)
8Ω Impedance
Headphones:
8Ω Impedance
3,5 mm
Accessories
supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height:
580 mm
Width:
666 mm
Depth:
472 mm
Net weight:
31kg
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.
ORDER No. SM-98033
1V p-p 75Ω
500mV rms 10kΩ
Y: 1V p-p 75Ω
C:0.3V p-p 75Ω
1Vp-p 75Ω
500mV rms 1kΩ
500mV rms 10kΩ
1V p-p 75Ω
{28,2kV ±1kV}
66cm
59cm}
51cm]
{531 mm}
[478 mm]
{601 mm}
[525 mm]
{439 mm}
[480 mm]
{25kg}
[22kg]

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Summary of Contents for Panasonic TX-28MD4P

  • Page 1 ORDER No. SM-98033 Colour Television TX-28MD4P TX-25MD4P TX-21MD4P EURO4 Chassis SPECIFICATIONS (Information in brackets { } refers to model TX-25MD4P) AV2 IN Video (21 pin) 1V p-p 75Ω (Information in brackets [ ] refers to model TX-21MD4P) Audio (21 pin) 500mV rms 10kΩ...

  • Page 2: Table Of Contents

    4M ohm and 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-28MD4P 28,5kV ± 1kV. infinite. TX-25MD4P 28,2kV ±...

  • Page 3: 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 4: 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 5: 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-21MD4P] Set the controls :- Confirm the following voltages. ± 0,25V ± 0,25V Brightness Minimum 12 ±...

  • Page 6: 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 7: 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 8: Block Diagrams

    VIDEO BLOCK DIAGRAM E - BOARD Y - BOARD TX-28MD4P TX-25MD4P Q906 Q908 COILS ONLY TX-28MD4P TX-25MD4P Q905 Q907 Q909 ONLY IC601 61 V IN 1 Q950 Q951 TUNER Q104 IC351 SVM OUT 34 VIDEO PROCESSOR B OUT 39 Q353...
  • Page 9 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 10 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 11 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 12: Parts Location

    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

    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 14 Cct Ref Parts Number Description Cct Ref Parts Number Description Q1052 BC847B TRANSISTOR D854 TVSRU2AMLFA5 DIODE Q1101 BC847B TRANSISTOR D855 FML22SLF610 DIODE D856 RU4AMLF-M1 DIODE Q1104 BC847B TRANSISTOR D857 MTZJT-775.1C DIODE Q1105 BC847B TRANSISTOR D858 MA165TA5 DIODE Q1106 BC847B TRANSISTOR D859 MA165TA5 DIODE...
  • Page 15 Cct Ref Parts Number Description Cct Ref Parts Number Description JA23 ERJ8GEY0R00 S.M.CARB .125W FILTERS R101 ERJ6GEY0R00 S.M.CARB 0.1W L804 ELF18N010A LINE FILTER R102 ERJ6GEYJ103 S.M.CARB 0.1W CRYSTALS R103 ERJ6GEYJ222 S.M.CARB 0.1W X601 4730007267 CRYSTAL R104 ERJ6GEYJ332 S.M.CARB 0.1W X1101 TSSA121 CRYSTAL R105...
  • Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description R451 ERJ6GEYJ223 S.M.CARB 0.1W R803 ERC12ZGK335D SOLID 0.5W 10% R452 ERJ6GEY0R00 S.M.CARB 0.1W R805 ERD25TJ473 CARBON 0.25W R453 ERJ6GEY0R00 S.M.CARB 0.1W R806 ERD25TJ100 CARBON 0.25W R454 ERJ6GEYJ752 S.M.CARB 0.1W R807 ERD25TJ332 CARBON 0.25W...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description R1125 ERJ6GEYJ472 S.M.CARB 0.1W R2305 ERJ6GEYJ102 S.M.CARB 0.1W R1126 ERJ6GEYJ101 S.M.CARB 0.1W R2306 ERJ6GEYJ103 S.M.CARB 0.1W R1127 ERJ6GEYJ101 S.M.CARB 0.1W R2308 ERJ6GEYJ104 S.M.CARB 0.1W 100K R1128 ERJ6GEYJ682 S.M.CARB 0.1W R2309 ERJ6GEYJ101 S.M.CARB 0.1W...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description 470µF C561 ECA1EHG102B ELECT CAPACITORS 100pF C562 ECKC2H101J CERAMIC 500V 10nF C102 ECUV1H103ZFX S.M. CAP 20µF C563 ECA2EHG220B ELECT 250V 100nF C103 ECJ2VF1H104Z ELECT 350V 20µF C564 ECEA2AU2R2 ELECT 100V 56pF C106 ECUV1H560JCX...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description 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 CERAMIC 500V C2121 ECA1CM100GB ELECT 100µF 100nF C854 ECA1EM102GB...
  • Page 20 EVQ23405R SWITCH TNP8EE009BL E P.C.B. S1204 EVQ23405R SWITCH TQF8E2694 MODEL LABEL S1205 EVQ23405R SWITCH TBM8E1728 PANASONIC BADGE TBX8E042-1 POWER BUTTON DIFFERENCES FOR MODEL TX-21MD4P TSX8E0028 POWER CORD TNP8EY012AA Y P.C.B. MECHANICAL PARTS MISCELLANEOUS COMPONENTS TKU8E00370 BACK COVER TPC8E4675 OUTER CARTON A51ECQ51X01 C.R.T.
  • Page 21 ELECT R920 ERQ14AJW390 FUSIBLE 0.25W 10µF C916 ECEA2CGE100 ELECT 160V R921 ERD25TJ471 CARBON 0.25W R922 ERD25TJ393 CARBON 0.25W DIFFERENCES FOR MODEL TX-28MD4P R923 ERD25TJ393 CARBON 0.25W R924 ERDS1FJ390 CARBON 0.5W MECHANICAL PARTS R925 ERJ6GEY0R00 S.M.CARB 0.1W R926 ERJ6GEY0R00 S.M.CARB 0.1W...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 4.7nF C904 ECUV1H472KBX S.M. CAP 470pF C906 ECUV1H471KBX S.M. CAP 150pF C908 ECUV1H151JCX S.M. CAP 4.7nF C909 ECKC2H472J CERAMIC 500V 4.7nF C910 ECKC2H472J CERAMIC 500V 150pF C911 ECUV1H151JCX S.M. CAP 10µF C912 ECEA2CU100...

  • Page 23: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-28MD4P / TX-25MD4P / TX-21MD4P (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 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...
  • Page 31 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...

This manual is also suitable for:

Tx-25md4pTx-21md4p

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