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TX-28/25MDT4F 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
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Table of Contents
Related Manuals for Panasonic TX-28MDT4F
Summary of Contents for Panasonic TX-28MDT4F
- 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 Y - Schematic BACK BACK...
- Page 3 ORDER No. SM-98035 Colour Television TX-28MDT4F TX-25MDT4F EURO4 Chassis SPECIFICATIONS (Information in brackets { } refers to model TX-25MDT4F) AV2 IN Video (21 pin) 1V p-p 75Ω Power Source: 220-240V AC, 50Hz Audio (21 pin) 500mV rms 10kΩ S-Video IN Y: 1V p-p 75Ω...
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Page 4: 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-28MDT4F 28,5kV ± 1kV. infinite. TX-25MDT4F 28,2kV ±... -
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 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 +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 12 ± 0,5V 33 ±... -
Page 8: Waveform Pattern Table
WAVEFORM PATTERN TABLE Vert Drive VFLB Vert Out IC451 Pin 2 IC451 Pin 3 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 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 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...
- 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...
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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
FUSE HOLDER MECHANICAL PARTS DIODES EASG12D531P2 SPEAKER ENG29504G TUNER D251 MA2180TP DIODE EUR511200 REMOTE CONTROL D253 MA700TA5 DIODE TBM8E1728 PANASONIC BADGE D254 MA700TA5 DIODE TKP8E1177 DOOR LID D354 1SR124-4AT82 DIODE TMX8E023 CHASSIS FRAME D355 1SR124-4AT82 DIODE TNP8EH002AA H P.C.B. D356... - Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description D852 MA165TA5 DIODE Q855 BC847B TRANSISTOR D853 MA2180BLFS DIODE Q856 BC847B TRANSISTOR D854 TVSRU2AMLFA5 DIODE Q857 2SA1018QTA TRANSISTOR Q905 BC847B TRANSISTOR D855 FML22SLF610 DIODE D856 RU4AMLF-M1 DIODE Q906 BC847B TRANSISTOR D857 MTZJT-775.1C DIODE...
- Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description L2103 EXCELSA35T COIL JA21 ERJ8GEY0R00 S.M.CARB .125W L2104 TLTACT4R7K COIL JA23 ERJ8GEY0R00 S.M.CARB .125W L3001 ELEMV1R5MA COIL ERJ8GEY0R00 S.M.CARB .125W L3002 ELEMV1R5MA COIL JA46 ERJ8GEY0R00 S.M.CARB .125W L3003 ELEMV1R5MA COIL JA29 ERJ8GEY0R00 S.M.CARB...
- Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description R312 ERJ6GEYJ331 S.M.CARB 0.1W R612 ERJ6GEYJ101 S.M.CARB 0.1W R351 ERJ6GEYJ302 S.M.CARB 0.1W R613 ERJ6GEYJ152 S.M.CARB 0.1W R352 ERJ6GEYJ302 S.M.CARB 0.1W R622 ERJ6GEY0R00 S.M.CARB 0.1W R353 ERJ6GEYJ302 S.M.CARB 0.1W R636 ERJ6GEYJ750 S.M.CARB 0.1W R354...
- Page 19 Cct Ref Parts Number Description Cct Ref Parts Number Description R915 ERJ6GEYJ152 S.M.CARB 0.1W R1157 ERJ6GEYJ103 S.M.CARB 0.1W R916 ERJ6GEYJ391 S.M.CARB 0.1W R1158 ERJ6GEYJ101 S.M.CARB 0.1W R919 ERQ14AJW390 FUSIBLE 0.25W R1159 ERJ6GEY0R00 S.M.CARB 0.1W R920 ERQ14AJW390 FUSIBLE 0.25W R1160 ERJ6GEYJ223 S.M.CARB 0.1W R921...
- Page 20 Cct Ref Parts Number Description Cct Ref Parts Number Description 4.7µF R3016 ERJ6GEYJ153 S.M.CARB 0.1W C257 ECA1HM4R7GB ELECT 33µF R3017 ERJ6GEYJ101 S.M.CARB 0.1W C258 ECA1EM330B ELECT 330nF R3018 ERJ6GEYJ471 S.M.CARB 0.1W C259 ECQM1H334J FILM R3019 ERJ6GEYJ101 S.M.CARB 0.1W C260 ECA1VM102GB ELECT R3020 ERJ6GEYJ153...
- Page 21 Cct Ref Parts Number Description Cct Ref Parts Number Description 15nF 470µF C611 ECUV1H153KBX S.M. CAP C872 ECA1CM471GB ELECT 15nF 10µF C612 ECUV1H153KBX S.M. CAP C873 ECA1CM100GB ELECT 15nF 10µF C613 ECUV1H153KBX S.M. CAP C875 ECA2CM4R7B ELECT 160V 50pF 100µF C614 ECUV1H050CCX S.M.
- Page 22 C3017 ECA1CM470GB ELECT 1.5nF C551 ECKC3D152J CERAMIC 560pF C3019 ECUV1H561JCX S.M. CAP 470nF C3020 ECJ3VB1C474K ELECT 3.5KV DIFFERENCES FOR MODEL TX-28MDT4F 2.2nF C3021 ECUV1H222JCX S.M. CAP 2.2nF C3022 ECUV1H222JCX S.M. CAP 2.2nF MECHANICAL PARTS C3023 ECUV1H222JCX S.M. CAP 47µF C3024...
- Page 23 NOTES...
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Page 24: Schematic Diagrams
SCHEMATIC DIAGRAMS FOR MODELS TX-28MDT4F / TX-25MDT4F (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 28: 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 29 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...