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Panasonic TX-28XD4A Service Manual
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Panasonic TX-28XD4A Service Manual

Panasonic TX-28XD4A Service Manual

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TX-28/25XD4A 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-28XD4A

  • 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 Y: 1V p-p 75Ω (21 pin) C: 0.3V p-p 75Ω AV2 OUT Video (21 pin) 1V p-p 75Ω Audio (21 pin) 500mV rms 1kΩ Selectable Output (21 pin) Panasonic CS ( U.K. ) Ltd. WILLOUGHBY ROAD, BRACKNELL, BERKS., RG12 8FT.
  • Page 4 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................................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 How to remove the rear cover Remove the 15 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 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 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 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 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 (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 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 E - BOARD TUNER IC251 IC2101 AUDIO AUDIO OUTPUT PROCESSOR DACM_R 24 Q2102 Q252 HEADPHONE DACM_L 25 L 11 Q2103 Q251 SC3_IN_L 37 SC3_IN_R 38 Q101 1 R OUT SC1_OUT_R 30 2 R IN SC1_IN_R 42 SC1_OUT_L 31 3 L OUT Q102 47 ANA_IN1+...
  • 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 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 NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List.
  • Page 16 TZS9EV274 GLIDE EAGG1216C2 SPEAKER UM-3DJ-2P BATTERY PACK ENG27506G TUNER VS-XD3/A VIDEO CABINET EUR511200 REMOTE CONTROL ZTUZAE550A ANODE LEAD TBM8E1728 PANASONIC BADGE RL801 TSE1885-1 RELAY TBX8E045 POWER BUTTON R802 232266296706 THERMISTOR TKP8E1169 SPEAKER NET S351 0330550049 CRT SOCKET TKP8E1180 DOOR LID...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description D456 MTZJT-775.6C DIODE D2303 MA723TA5 DIODE D457 MA165TA5 DIODE D2304 MA723TA5 DIODE D501 MA165TA5 DIODE D3101 MTZJT-778.2C DIODE D502 1SR124-4AT82 DIODE D3102 MTZJT-778.2C DIODE D511 MA4047 DIODE TRANSISTORS D551 ERD07-15L7 DIODE Q101 BC847B...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description T551 ZTFL94002A F.B.T. JA11 ERJ6GEY0R00 S.M.CARB 0.1W T801 ETS39AG1H7AD TRANSFORMER JA45 ERJ6GEY0R00 S.M.CARB 0.1W T802 ETP35KAN619U TRANSFORMER JA25 ERJ6GEY0R00 S.M.CARB 0.1W JA22 ERJ6GEY0R00 S.M.CARB 0.1W COILS ERJ6GEY0R00 S.M.CARB 0.1W L104 EXCELSA35T COIL JA16...
  • 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% R1104 ERJ6GEYJ331 S.M.CARB 0.1W R805 ERD25TJ473 CARBON 0.25W R1105 ERJ6GEYJ101 S.M.CARB 0.1W R806 ERD25TJ100 CARBON 0.25W R1106 ERJ6GEYJ104 S.M.CARB 0.1W 100K R807 ERD25TJ332 CARBON 0.25W R1107 ERJ6GEYJ104 S.M.CARB...
  • Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description R2105 ERJ6GEYJ101 S.M.CARB 0.1W R3108 ERJ6GEYJ153 S.M.CARB 0.1W R2106 ERJ6GEYJ101 S.M.CARB 0.1W R3402 ERJ6GEYJ750 S.M.CARB 0.1W R2107 ERJ6GEYJ101 S.M.CARB 0.1W R3403 ERJ6GEYJ101 S.M.CARB 0.1W R2108 ERJ6GEYJ101 S.M.CARB 0.1W R3404 ERJ6GEYJ242 S.M.CARB 0.1W R2109...
  • Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 1.5nF 270pF C360 ECKC3D152J CERAMIC C633 ECUV1H271JCX S.M. CAP 1.5nF 270pF C361 ECA1HMR47GB ELECT C634 ECUV1H271JCX S.M. CAP 470µF 18pF C363 ECA1VM471GB ELECT C635 ECUV1H180JCX S.M. CAP 10nF 270pF C364 ECJ2VF1H103Z ELECT 350V...
  • Page 23 Cct Ref Parts Number Description Cct Ref Parts Number Description 22pF 2.2nF C1103 ECUV1H220JCX S.M. CAP C3002 ECUV1H222JCX S.M. CAP 22pF 47µF C1104 ECUV1H220JCX S.M. CAP C3003 ECA1CM470GB ELECT 100pF 560pF C1105 ECUV1H101JCX S.M. CAP C3005 ECUV1H561JCX S.M. CAP 33nF 470nF C1108 ECJ2VB1H333K...
  • Page 24 Cct Ref Parts Number Description Cct Ref Parts Number Description TLK8E05138 DEGAUSS COIL TNP8EE009BC E P.C.B. TKP8E1192 LEFT PANEL TQF8E2671 MODEL LABEL TKP8E1194 RIGHT PANEL TKP8E1190 TOP PANEL MISCELLANEOUS COMPONENTS TPC8E4660-1 OUTER CARTON TPD8E631 TOP CUSHION TPD8E632 BOTTOM CUSHION I.C.s IC1103 XGL2-03GA EAROM *...
  • Page 25 NOTES...
  • Page 26 SCHEMATIC DIAGRAMS FOR MODELS TX-28XD4/A / TX-25XD4/A (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. Unit of resistance is OHM (Ω) (k=1,000, M=1,000,000) CAPACITORS All capacitors are ceramic 50V 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 NOTES...
  • Page 34 NOTES...

This manual is also suitable for:

Tx-25xd4aTx-28xd4/a