Table of Contents
Advertisement
Quick Links
TX-28/25EX4F 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
Advertisement
Table of Contents
Related Manuals for Panasonic TX-28EX4F
Summary of Contents for Panasonic TX-28EX4F
- 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 ORDER No. SM-98022 Colour Television TX-28EX4F TX-25EX4F EURO4 Chassis SPECIFICATIONS (Information in brackets { } refers to model TX-25EX4F) AV2 OUT Video (21 pin) 1V p-p 75Ω Power Source: 220-240V AC, 50Hz Audio (21 pin) 500mV rms 1kΩ Selectable Output (21 pin)
-
Page 4: Table Of Contents
CONTENTS SAFETY PRECAUTIONS................................2 SERVICE HINTS ..................................3 ADJUSTMENT PROCEDURE..............................4 ADJUSTMENT PROCEDURE AND SELF-CHECK ........................5 WAVEFORM PATTERN TABLE ...............................6 ALIGNMENT SETTINGS................................7 BLOCK DIAGRAMS ..................................8 PARTS LOCATION .................................12 REPLACEMENT PARTS LIST ..............................13 SCHEMATIC DIAGRAMS ...............................22 CONDUCTOR VIEWS................................26 SAFETY PRECAUTIONS GENERAL GUIDE LINES It is advisable to insert an isolation transformer in the The potential at any point should not exceed AC supply before servicing a hot chassis. -
Page 5: Service Hints
SERVICE HINTS How to remove the rear cover Remove the 12 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: 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 7: Adjustment Procedure And Self-Check
ADJUSTMENT PROCEDURE Item / Preparation Adjustments Set the +B voltage up as follows:- +B SET-UP Adjust R811 so that B2 shows 148V±1V. Receive a Greyscale signal. Confirm the following voltages. Set the controls :- ± 0,25V ± 0,25V 12 ± 0,5V 33 ±... -
Page 8: 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 9: 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 10: 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 11 AUDIO BLOCK DIAGRAM E - BOARD TUNER IC251 IC2101 AUDIO AUDIO OUTPUT PROCESSOR Q103 DACM_R 24 Q2102 Q252 X101 HEADPHONE DACM_L 25 L 11 Q2103 Q251 X102 SC3_IN_L 37 SC3_IN_R 38 Q101 44 MONO IN 1 R OUT SC1_OUT_R 30 2 R IN SC1_IN_R 42 49 ANA_IN2+...
- Page 12 CONTROL BLOCK DIAGRAM E - BOARD H - BOARD TUNER POS/NEG IC3401 L/L’ 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...
- Page 13 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 14: Parts Location
PARTS LOCATION NOTE: The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List. -
Page 15: Replacement Parts List
SPEAKER F802 19181-3.15 FUSE ENG29504G TUNER F8021 EYF52BC FUSE HOLDER EUR511200 REMOTE CONTROL F8022 EYF52BC FUSE HOLDER TBM8E1728 PANASONIC BADGE DIODES TBX8E061 POWER BUTTON TKP8E1222 REAR AV COVER D101 MA3020TX DIODE TKP8E1256 DOOR LID D102 MA3020TX DIODE TMX8E020 CHASSIS FRAME... - Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description D803 1SR124-4AT82 DIODE Q503 2SD2398-M2 TRANSISTOR D804 1SR124-4AT82 DIODE Q551 BU2508AXLB TRANSISTOR D805 TLP621GR-LF2 PHOTO COUPLER Q552 2SC1473-RN TRANSISTOR Q701 BC857B TRANSISTOR D806 1SR124-4AT82 DIODE D850 RU4BLF-L1 DIODE Q850 2SD1273PLB TRANSISTOR D851 MTZJT776.2B...
- Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description L604 TLTACT4R7K COIL JSE33 ERJ6GEY0R00 S.M.CARB 0.1W L606 TLTACT4R7K COIL JSE3 ERJ6GEY0R00 S.M.CARB 0.1W L607 ELJFC2R2KF COIL JSE26 ERJ6GEY0R00 S.M.CARB 0.1W L701 ELC10D822E COIL JSE25 ERJ6GEY0R00 S.M.CARB 0.1W L850 EXCELSA35T COIL JA52 ERJ6GEY0R00...
- Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description R266 ERD25TJ2R2 CARBON 0.25W R567 ERF7ZK1R0 WOUND 7W 10% R267 ERF7ZK4R7 WOUND 7W 10% R601 ERJ6GEYJ101 S.M.CARB 0.1W R271 ERJ6GEYJ103 S.M.CARB 0.1W R602 ERJ6GEYJ821 S.M.CARB 0.1W R272 ERF7ZK4R7 WOUND 7W 10% R603 ERJ8GEYJ103 S.M.CARB...
- Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R868 ERJ6GEYJ223 S.M.CARB 0.1W R1130 ERJ6GEYJ103 S.M.CARB 0.1W R869 ERJ6GEY0R00 S.M.CARB 0.1W R1131 ERJ6GEYJ103 S.M.CARB 0.1W R870 ERJ6GEYJ272 S.M.CARB 0.1W R1132 ERJ6GEYJ101 S.M.CARB 0.1W R871 ERJ6GEYJ153 S.M.CARB 0.1W R1133 ERJ6GEYJ273 S.M.CARB 0.1W R872...
- Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description 100nF C102 ECJ2VB1C104K ELECT 350V R2308 ERJ6GEYJ104 S.M.CARB 0.1W 100K 100nF R2309 ERJ6GEYJ101 S.M.CARB 0.1W C103 ECJ2VF1H104Z ELECT 350V R2310 ERJ6GEYJ471 S.M.CARB 0.1W C104 ECUV1H102JCX S.M. CAP 56pF R2311 ERJ6GEYJ102 S.M.CARB 0.1W C105...
- Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description 68nF 4.7nF C511 ECQM2683JZ FILM 250V C809 ECKC2H472J CERAMIC 500V 4.7nF C552 ECWH15H102J FILM 1500V C810 ECKC2H472J CERAMIC 500V 180µF C554 ECWF2H514J FILM 500V C811 ECOS2GG181NG ELECT 400V 10nF C555 ECWH15H103J FILM 1500V...
- Page 22 Cct Ref Parts Number Description Cct Ref Parts Number Description 100pF 470nF C1124 ECUV1H101JCX S.M. CAP C3020 ECJ3VB1C474K ELECT 3.5KV 100pF 2.2nF C1125 ECUV1H101JCX S.M. CAP C3021 ECUV1H222JCX S.M. CAP 100pF 2.2nF C1126 ECUV1H101JCX S.M. CAP C3022 ECUV1H222JCX S.M. CAP 220pF 2.2nF C1127...
- Page 23 Parts Number Description Cct Ref Parts Number Description R359 ERDS1TJ114 CARBON 0.5W 110K CAPACITORS 1.5nF C551 ECKC3D152J CERAMIC DIFFERENCES FOR MODEL TX-28EX4F MECHANICAL PARTS TKU8E00321-1 BACK COVER A66ECF50X41 C.R.T. TKY8E305 CABINET TLK8E05140 DEGAUSS COIL TNP8EE009AF E P.C.B. TQF8E2682 MODEL LABEL TSX8E0027...
-
Page 24: Schematic Diagrams
SCHEMATIC DIAGRAMS FOR MODELS TX-28EX4F / TX-25EX4F (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 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...