Panasonic TX-W28R4 Service Manual
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Panasonic TX-W28R4 Service Manual

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TX-W28R4 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-W28R4

  • Page 1 TX-W28R4 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: Specifications

    Y: 1V p-p 75 (21 pin) C: 0.3V p-p 75 AV2 OUT Video (21 pin) 1V p-p 75 Audio (21 pin) 500mV rms 1k Selectable Output (21 pin) Panasonic CS ( U.K. ) Ltd. WILLOUGHBY ROAD, BRACKNELL, BERKS., RG12 8FT.

  • 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 ...............................23 CONDUCTOR VIEWS................................28 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: How To Move The Chassis Into 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 64 S 64 S 64 S HFLB HFLB...

  • 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

    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

    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

    PUSH PLATE EAGG1218J2 SPEAKER TZS9EV294 BOTTOM PLATE ENG27506G TUNER TZS9EV295 TOP HINGE EUR511210 REMOTE CONTROL TZS9EV296 SHELF PIN TBM8E1728 PANASONIC BADGE UM-3DJ-2P BATTERY PACK TBX8E049 POWER BUTTON ZTUZAE550A ANODE LEAD THT1062 CRT FIXING SCREW RL801 TSE1885-1 RELAY TKK8E026 SPEAKER REFLECTOR...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description D551 ERD07-15L7 DIODE Q105 BC847B TRANSISTOR Q251 2SD1328STX TRANSISTOR D552 RU3LFA1 DIODE D553 1SR124-4AT82 DIODE Q252 2SD1328STX TRANSISTOR Q253 BC847B TRANSISTOR D554 1SR124-4AT82 DIODE D556 MA165TA5 DIODE Q254 BC847B TRANSISTOR D557 EU02 DIODE...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description T801 ETS42AE226AD TRANSFORMER JA15 ERJ6GEY0R00 S.M.CARB 0.1W T802 ETP35KAN619U TRANSFORMER JA26 ERJ6GEY0R00 S.M.CARB 0.1W JA22 ERJ6GEY0R00 S.M.CARB 0.1W COILS JA40 ERJ6GEY0R00 S.M.CARB 0.1W J164 TLT331K991R COIL JA39 ERJ6GEY0R00 S.M.CARB 0.1W L104 EXCELSA35T COIL...
  • Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R116 ERJ6GEYJ562 S.M.CARB 0.1W R453 ERJ6GEY0R00 S.M.CARB 0.1W R117 ERJ6GEYJ222 S.M.CARB 0.1W R454 ERJ6GEYJ752 S.M.CARB 0.1W R118 ERJ6GEYJ102 S.M.CARB 0.1W R455 ERJ6GEYJ222 S.M.CARB 0.1W R121 ERJ6GEYJ471 S.M.CARB 0.1W R456 ERJ6GEYJ104 S.M.CARB 0.1W 100K...
  • Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description R803 ERC12ZGK335D SOLID 0.5W 10% R1105 ERJ6GEYJ101 S.M.CARB 0.1W R805 ERD25TJ473 CARBON 0.25W R1106 ERJ6GEYJ104 S.M.CARB 0.1W 100K R806 ERD25TJ100 CARBON 0.25W R1107 ERJ6GEYJ104 S.M.CARB 0.1W 100K R807 ERD25TJ332 CARBON 0.25W R1108 ERJ6GEYJ102...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description R2106 ERJ6GEYJ101 S.M.CARB 0.1W R3219 ERJ6GEYJ102 S.M.CARB 0.1W R2107 ERJ6GEYJ101 S.M.CARB 0.1W R3220 ERJ6GEYJ683 S.M.CARB 0.1W R2108 ERJ6GEYJ101 S.M.CARB 0.1W R3221 ERJ6GEYJ302 S.M.CARB 0.1W R2109 ERJ6GEYJ183 S.M.CARB 0.1W R3222 ERJ6GEYJ223 S.M.CARB 0.1W R2110...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 50pF C265 ECQM1H184J FILM C615 ECUV1H050CCX S.M. CAP 100µF C616 ECA1HM101GB ELECT C266 ECA1HMR22GB ELECT 100nF 22nF C267 ECJ2VB1H104K ELECT 350V C617 ECUV1H223KBX S.M. CAP 100nF 220µF C268 ECJ2VB1H104K ELECT 350V C618 ECA1CM221GB...
  • Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description 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. CAP 470pF 10nF C906 ECUV1H471KBX S.M.
  • Page 24 Cct Ref Parts Number Description Cct Ref Parts Number Description 220nF C3404 ECQM1H224J FILM 18pF C3405 ECUV1H180JCX S.M. CAP 270pF C3406 ECUV1H271JCX S.M. CAP 270pF C3407 ECUV1H271JCX S.M. CAP 100µF C3408 ECA1HM101GB ELECT 100µF C3601 ECA1HM101GB ELECT 100nF JSE28 ECUV1H104KBX S.M.

  • Page 25: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODEL TX-W28R4 (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

    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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