Panasonic TX-W28R4L Service Manual
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Panasonic TX-W28R4L Service Manual

Euro4 chassis
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TX-W28R4L 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

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Summary of Contents for Panasonic TX-W28R4L

  • Page 1 TX-W28R4L Service Manual Safety Service Support Specifications Service and repair of Block Diagrams this product is Parts List supported by Panasonic's LUCI Service interface. Information This interface provides a Adjustments link between the TV and a standard PC to allow a...
  • Page 2 Audio Control Power supply Video BACK E - PCB M - PCB E - Schematic H - Schematic Y - PCB M - Schematic Y - Schematic BACK BACK...
  • Page 3 ORDER No. SM-98061 Colour Television TX-W28R4L EURO4 Chassis SPECIFICATIONS AV3 IN S-Video IN Y: 1V p-p 75Ω Power Source: 220-240V AC, 50Hz (4-pin) C: 0,3V p-p 75Ω Audio (RCAx2) 500mV rms10kΩ Power Consumption: 100W Video (RCAx1) 1V p-p 75Ω Aerial Impedance: 75Ω...

  • Page 4: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 SERVICE POSITION.................................4 ADJUSTMENT PROCEDURE..............................5 ADJUSTMENT PROCEDURE AND SELF-CHECK ........................6 WAVEFORM PATTERN TABLE ...............................7 ALIGNMENT SETTINGS................................8 BLOCK DIAGRAMS ..................................9 PARTS LOCATION .................................13 REPLACEMENT PARTS LIST ..............................14 SCHEMATIC DIAGRAMS ...............................24 CONDUCTOR VIEWS................................27 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the Reverse the AC plug at the outlet and repeat each of AC supply before servicing a hot chassis.

  • 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 M - Board Screen H - Board E - 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 screw, using back cover screw, into top right-hand cabinet rib (A), shown in Fig.4. 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 vertically 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. Receive a Greyscale signal. Confirm the following voltages. Set the controls :- ± 0,25V ± 0,25V Brightness Minimum 12 ±...

  • Page 9: Waveform Pattern Table

    WAVEFORM PATTERN TABLE Vert Drive Vert Out VFLB IC451 Pin 2 IC601 Pin 31 IC451 Pin 3 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 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 12 AUDIO BLOCK DIAGRAM M - BOARD E - BOARD TUNER IC251 IC2101 E16A M1 AUDIO AUDIO OUTPUT PROCESSOR Q101 DACM_R 24 Q2102 Q252 Q102 47 ANA_IN1+ HEADPHONE DACM_L 25 Q2103 L 11 Q251 SC3_IN_L 37 SC3_IN_R 38 1 R OUT SC1_OUT_R 30 SC1_IN_R 42 2 R IN...
  • Page 13 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 M - BOARD SDA 2 M2 E17 SCL 2 VPROT Q451 LOCAL...
  • Page 14 POWER SUPPLY BLOCK DIAGRAM E - BOARD 5V SBY Q852 D867 Q855 Q254 Q253 D868 Q853 Q854 IC251 Y - BOARD AUDIO D862 T802 RL801 OUTPUT R854 IC351 T801 D801 Line Filter T551 OUTPUT 150V 200V D850 R802 DEGAUSS Q850 COIL -14V IC451...

  • 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

    IC850 SE140N ERROR AMPLIFER ENG27508G TUNER IC851 L78M12MRB 12V REGULATOR EUR511210 REMOTE CONTROL IC853 AN78L08TA 8V REGULATOR TBM8E1728 PANASONIC BADGE IC1061 RPM-637CBRS1 LED RECEIVER TBX8E049 POWER BUTTON IC1101 SDA5450C48 MICRO PROCESSOR THT1062 CRT FIXING SCREW IC1102 27C2001-F20 EPROM * TKK8E026...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description D615 STZ6.2NT146 DIODE Q351 2SA1767 TRANSISTOR D616 STZ6.2NT146 DIODE Q352 2SA1767 TRANSISTOR D701 MA165TA5 DIODE Q353 2SA1767 TRANSISTOR D702 MTZJT-775.6C DIODE Q354 BC857B TRANSISTOR D704 MA29TA5 DIODE Q451 BC857B TRANSISTOR D705 MTZJT-775.6B DIODE...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description L451 EXCELSA35T COIL JA17 ERJ6GEY0R00 S.M.CARB 0.1W L501 EXCELSA35T COIL JA21 ERJ8GEY0R00 S.M.CARB .125W L552 ELH5L6110 COIL JA22 ERJ6GEY0R00 S.M.CARB 0.1W L553 ELC08D682E COIL JA23 ERJ8GEY0R00 S.M.CARB .125W L554 ELC18B102L COIL JA25 ERJ6GEY0R00...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R254 ERJ6GEYJ221 S.M.CARB 0.1W R460 ERDS1TJ331 CARBON 0.5W R255 ERJ6GEYJ103 S.M.CARB 0.1W R461 ERW2PK1R2 WOUND 2W 10% R256 ERJ6GEYJ471 S.M.CARB 0.1W R463 ERD25TJ222 CARBON 0.25W R257 ERJ6GEYJ220 S.M.CARB 0.1W R464 ERJ6GEYJ182 S.M.CARB 0.1W...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description R812 ERD75TAJ825 CARBON 0.75W R1112 ERJ6GEYJ473 S.M.CARB 0.1W R813 ERF7ZK2R7 WOUND 7W 20% R1113 ERJ6GEYJ101 S.M.CARB 0.1W R814 ERD25TJ473 CARBON 0.25W R1115 ERJ6GEYJ471 S.M.CARB 0.1W R815 ERD25TJ222 CARBON 0.25W R1116 ERJ6GEYJ101 S.M.CARB 0.1W...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description R2113 ERJ6GEYJ562 S.M.CARB 0.1W R3218 ERJ6GEYJ223 S.M.CARB 0.1W R2114 ERJ6GEYJ101 S.M.CARB 0.1W R3219 ERJ6GEYJ102 S.M.CARB 0.1W R2115 ERJ6GEYJ222 S.M.CARB 0.1W R3220 ERJ6GEYJ683 S.M.CARB 0.1W R2116 ERJ6GEYJ101 S.M.CARB 0.1W R3221 ERJ6GEYJ302 S.M.CARB 0.1W R2117...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 1µF 50pF C264 ECA1HHG222E ELECT C614 ECUV1H050CCX S.M. CAP 1µF 50pF C265 ECA1HM010GB ELECT C615 ECUV1H050CCX S.M. CAP 1µF 100µF C266 ECA1HM010GB ELECT C616 ECA1HM101GB ELECT 100nF 22nF C267 ECJ2VB1H104K ELECT 350V C617...
  • Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description 470pF C876 ECA1AHG471E ELECT C2128 ECUV1H010CCX S.M. CAP 100µF C902 ECA1VM101GB ELECT C2129 ECA1CM102B ELECT 4.7nF 330µF C903 ECUV1H472KBX S.M. CAP C2130 ECA1CM331B ELECT 4.7nF 10nF C904 ECUV1H472KBX S.M. CAP C2131 ECUV1H103ZFX S.M.
  • Page 24 Cct Ref Parts Number Description Cct Ref Parts Number Description 100nF C3217 ECJ2VB1C104K ELECT 350V 4R7µF C3221 ECA1HM4R7 ELECT 220nF C3401 ECQM1H224J FILM 100pF C3402 ECUV1H101JCX S.M. CAP 100µF C3403 ECA1HM101GB ELECT 220nF C3404 ECQM1H224J FILM 18pF C3405 ECUV1H180JCX S.M. CAP 270pF C3406 ECUV1H271JCX...

  • Page 25: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODEL TX-W28R4L (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 30 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 31 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 32 M - BOARD TNP8EM013 TRANSISTORS Q1061 Q1062 Q3201 Q3202 Q3203 Q3204 Q3205 Q3206 Q3207 Q3208 Q3209 DIODES D1061 D3201 D3202 D3203 IC’S IC1601...
  • Page 33 NOTES...

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