Panasonic TX-25MDT4F, Service Manual

Page 1: ...C to allow a number of diagnostic and control functions to be performed For more details contact your local Panasonic company BACK EXIT TX 28 25MDT4F Service Manual Safety Specifications Block Diagrams Schematic Diagrams PCB Views Self Check Service Information Parts List Service Hints Disassembly Location of Controls Waveforms Mechanical View Adjustments ...

Page 2: ...BACK BACK BACK E Schematic H Schematic Y Schematic E PCB Y PCB Audio Power supply Control Video ...

Page 3: ...2 500mV rms 1kΩ AV1 IN Video 21 pin 1V p p 75Ω Audio 21 pin 500mV rms 10kΩ RGB 21 pin AV1 OUT Video 21 pin 1V p p 75Ω Audio 21 pin 500mV rms 1kΩ AV2 IN Video 21 pin 1V p p 75Ω Audio 21 pin 500mV rms 10kΩ S Video IN Y 1V p p 75Ω 21 pin C 0 3V p p 75Ω AV2 OUT Video 21 pin 1Vp p 75Ω Audio 21 pin 500mV rms 1kΩ Selectable output 21 pin AV3 IN Audio RCAx2 500mV rms 10kΩ Video RCAx1 1V p p 75Ω High Volta...

Page 4: ... on the receiver such as screw heads aerials connectors control shafts etc When the exposed metallic part has a return path to the chassis the reading should be between 4M ohm and 20M ohm When the exposed metal does not have a return path to the chassis the reading must be infinite LEAKAGE CURRENT HOT CHECK 1 Plug the AC cord directly into the AC outlet Do not use an isolation transformer for this...

Page 5: ...SERVICE HINTS How to remove the rear cover 1 Remove the 9 screws as shown in Fig 2 LOCATION OF CONTROLS 3 SCREWS Fig 2 E BOARD Y BOARD FOCUS SCREEN H BOARD Fig 3 ...

Page 6: ...ch the TV on 2 Go into Service Mode as explained above The screen will show 3 Press the BLUE button on the remote control The screen will show 4 Press the STR button on the TV The screen will show 5 All the tuning information stored inside the TV will now be transferred to the Memory Pack This process will take 2 3 minutes to complete and when finished the screen will show Memory Pack to TV proces...

Page 7: ...trols at the front of the set at the same time pressing the STATUS button on the remote control and the screen will show If the CCU ports have been checked and found to be incorrect or not located then will appear in place of O K Service Aids To aid in the service of our current chassis there are a number of Service Aids which have been made available LUCI interface kit Linked Utility Computer Int...

Page 8: ...275mV 64µS 64µS 3V H Out IC601 Pin 50 Vert Out IC601 Pin 31 20mS 0 7V 13µS 3 7V SCL IC1201 Pin 3 R Out E8 Pin 5 64µS 4 6V HFLB IC601 Pin 13 64µS 6 2V R Out IC601 Pin 37 64µS 275mV G Out IC601 Pin 38 275mV 64µS Vert Drive IC451 Pin 2 20mS 57V HFLB IC701 Pin 8 64µS 1 5V G Out E8 Pin 3 64µS 4 4V SVM Out IC601 Pin 34 88mV 64µS H Out IC701 Pin 5 30mV 64µS ...

Page 9: ...al Linearity V Lin 006 Optimum setting Vertical Symmetry V Sym 002 Optimum setting DVCO DVCO 005 Receive a PAL Colour Bar Pattern For DVCO alignment press Blue button wait until the colours are changing slowly and press STR Cut off DC Cut off 0171 Ug2 Test Ug2 055 O K To adjust Cutoff connect an oscilloscope to the blue cathode adjust cutoff value using the Yellow and Blue buttons until the black ...

Page 10: ... OUT 39 Q305 Q303 Q301 E8 4 3 5 Q353 Q352 Q351 CRT 3 2 1 7 8 9 Y2 4 3 5 IC351 TUNER Q104 5HG OXH UHHQ 9LGHR Q 9 9LGHR 2XW G OUT 38 R OUT 37 G IN 46 R IN 45 Q306 Q304 Q302 Q354 7 7 VM COILS Q905 Q907 Q909 Q908 Q906 SVM OUT 34 Q950 Q951 Q3001 G 38 B 39 Y BOARD E BOARD RGB OUTPUT VIDEO PROCESSOR MICRO PROCESSOR H3 E61 E15 1 6 8 H1 1 6 8 H BOARD 8 IC3401 Q3402 8 6 3 VIDEO SWITCHING ...

Page 11: ...3 L OUT 1 R OUT 3 L OUT 2 R IN 6 L IN 2 R IN 6 L IN 47 ANA_IN1 44 MONO IN DACM_L 25 SC3_IN_R 38 SC1_IN_R 42 SC1_IN_L 41 SC2_OUT_R 27 SC2_OUT_L 28 SC2_IN_R 40 SC2_IN_L 39 Q252 Q251 2 L L 11 4 L HEADPHONE 7 R 5 L E6 1 E7 3 Q2304 Q2302 21 DACA_R 22 DACA_L E BOARD AUDIO PROCESSOR AUDIO OUTPUT AUDIO MONITOR OUT Q2303 Q2301 Q103 49 ANA_IN2 X101 X102 9 ...

Page 12: ...ITCH MATRIX 60 Q854 52 Q853 74 IC1051 Q1052 81 AV2 8 10 AV1 8 10 12 Q856 75 Q851 Q1106 Q1105 Q1107 Q1104 51 72 73 AV LINK SLOW 2 SLOW 1 SCL 1 SDA 1 59 58 Q3006 Q3007 55 VPROT KEYSCAN ON OFF R C L E D PROT 1 SLOW 2 OUT IN SLOW 1 SERVICE SCL SDA H BOARD E BOARD VIDEO SWITCHING AUDIO PROCESSOR MICRO PROCESSOR VIDEO PROCESSOR EAROM REMOTE CONTROL RECEIVER Q1051 D1051 L L L L POS NEG 82 83 POS NEG Q340...

Page 13: ... P2 P1 S5 S2 S7 10 9 6 8 5 6 2 6 3 1 6 12V 200V 33V 14V 14V 27V 150V 29V 7V 15V 5V D867 Q852 Q854 Q855 1 D805 R805 R814 IC850 1 2 D862 R854 33V 16 RESET MICRO PROCESSOR AUDIO PROCESSOR VIDEO PROCESSOR EPROM EAROM RESET REG REG REG IC3401 7 VIDEO SWITCHING EW CORRECTION POWER SUPPLY RGB OUTPUT V OUTPUT AUDIO OUTPUT D801 E BOARD Y BOARD E3 2 Y3 2 E1 4 1 E2 2 1 R802 DEGAUSS COIL Line Filter E62 1 H3 ...

Page 14: ...PARTS LOCATION 12 NOTE The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List 18 8 14 10 12 13 17 4 5 9 3 16 11 15 6 1 7 2 ...

Page 15: ...TRF6654LF51 ERROR AMPLIFER IC850 SE140N 12V REGULATOR IC851 L78M12MRB 5V REGULATOR IC852 L78M05MRB 8V REGULATOR IC853 AN78L08TA MICRO PROCESSOR IC1101 SDA5450C48 EPROM IC1102 27C2001 F17 DIODE IC1104 MN1381 R TA DIODE IC1105 MN1381 T TA AUDIO PROCESSOR IC2101 MSP3410DPOB4 AV SWITCHING IC3401 TEA2114 FUSES FUSE F802 19181 3 15 FUSE HOLDER F8021 EYF52BC FUSE HOLDER F8022 EYF52BC DIODES DIODE D251 MA...

Page 16: ...Q701 BC857B TRANSISTOR Q850 2SD1273PLB TRANSISTOR Q851 BC857B TRANSISTOR Q852 2SC1383 S TRANSISTOR Q853 BC847B TRANSISTOR Q854 BC847B TRANSISTOR Q855 BC847B TRANSISTOR Q856 BC847B TRANSISTOR Q857 2SA1018QTA TRANSISTOR Q905 BC847B TRANSISTOR Q906 BC847B TRANSISTOR Q907 BC857B TRANSISTOR Q908 2SA1535ARLB TRANSISTOR Q909 2SC3944ARLB TRANSISTOR Q950 BC847B TRANSISTOR Q951 FMY4T148 TRANSISTOR Q1051 BC8...

Page 17: ...R00 125W 5 0 S M CARB JA1 ERJ8GEY0R00 125W 5 0 S M CARB JA46 ERJ8GEY0R00 125W 5 0 S M CARB JA29 ERJ8GEY0R00 125W 5 0 S M CARB JA30 ERJ8GEY0R00 125W 5 0 S M CARB JA31 ERJ8GEY0R00 125W 5 0 S M CARB JA32 ERJ8GEY0R00 125W 5 0 S M CARB JA33 ERJ8GEY0R00 125W 5 0 S M CARB JA34 ERJ8GEY0R00 125W 5 0 S M CARB JA35 ERJ8GEY0R00 125W 5 0 S M CARB JA59 ERJ8GEY0R00 125W 5 0 S M CARB JA56 ERJ8GEY0R00 125W 5 0 S M...

Page 18: ...ARB R608 ERJ6GEYJ271 0 1W 5 270 S M CARB R609 ERJ6GEYJ122 0 1W 5 1K2 S M CARB R610 ERJ6GEY0R00 0 1W 5 0 S M CARB R611 ERJ6GEYJ103 0 1W 5 10K S M CARB R612 ERJ6GEYJ101 0 1W 5 100 S M CARB R613 ERJ6GEYJ152 0 1W 5 1K5 S M CARB R622 ERJ6GEY0R00 0 1W 5 0 S M CARB R636 ERJ6GEYJ750 0 1W 5 75 S M CARB R645 ERJ6GEYJ103 0 1W 5 10K S M CARB R647 ERJ6GEYJ472 0 1W 5 4K7 S M CARB R648 ERJ6GEYJ152 0 1W 5 1K5 S M...

Page 19: ... CARB R1151 ERJ6GEYJ101 0 1W 5 100 S M CARB R1152 ERJ6GEYJ101 0 1W 5 100 S M CARB R1156 ERJ6GEYJ101 0 1W 5 100 S M CARB R1157 ERJ6GEYJ103 0 1W 5 10K S M CARB R1158 ERJ6GEYJ101 0 1W 5 100 S M CARB R1159 ERJ6GEY0R00 0 1W 5 0 S M CARB R1160 ERJ6GEYJ223 0 1W 5 22K S M CARB R1161 ERJ6GEYJ103 0 1W 5 10K S M CARB R1162 ERJ6GEYJ222 0 1W 5 2K2 S M CARB R1163 ERJ6GEYJ222 0 1W 5 2K2 S M CARB R1164 ERJ6GEYJ33...

Page 20: ... ECUV1H100DCX 50V 10pF ELECT C251 ECA1EM330B 25V 33µF S M CAP C252 ECUV1H223KBX 50V 22nF ELECT C253 ECA1HM4R7GB 50V 4 7µF FILM C254 ECQM1H334J 50V 330nF ELECT C255 ECA1EM101GB 25V 100µF S M CAP C256 ECUV1H223KBX 50V 22nF ELECT C257 ECA1HM4R7GB 50V 4 7µF ELECT C258 ECA1EM330B 25V 33µF FILM C259 ECQM1H334J 50V 330nF ELECT C260 ECA1VM102GB 35V 1nF ELECT C261 ECA1VM102GB 35V 1nF FILM C262 ECQV1H124JZ ...

Page 21: ...ECT C869 ECA1EM101GB 25V 100µF ELECT C870 ECA1EM471GB 25V 470µF ELECT C871 ECA1CM102B 16V 470µF ELECT C872 ECA1CM471GB 16V 470µF ELECT C873 ECA1CM100GB 16V 10µF ELECT C875 ECA2CM4R7B 160V 10µF ELECT C876 ECA1HHG101B 50V 100µF ELECT C902 ECA1VM101GB 35V 100µF S M CAP C903 ECUV1H472KBX 50V 4 7nF S M CAP C904 ECUV1H472KBX 50V 4 7nF S M CAP C906 ECUV1H471KBX 50V 470pF S M CAP C908 ECUV1H151JCX 50V 150...

Page 22: ...H271JCX 50V 270pF S M CAP C3034 ECUV1H271JCX 50V 270pF S M CAP C3035 ECUV1H271JCX 50V 270pF S M CAP C3101 ECUV1H104KBX 50V 270pF S M CAP C3102 ECUV1H104KBX 50V 270pF S M CAP C3103 ECUV1H561JCX 50V 560pF S M CAP C3104 ECUV1H561JCX 50V 560pF S M CAP C3105 ECUV1H561JCX 50V 560pF S M CAP C3106 ECUV1H561JCX 50V 560pF ELECT C3107 ECA1HM470GB 50V 47µF ELECT C3108 ECA1HM470GB 50V 47µF S M CAP C3111 ECUV1H...

Page 23: ...21 NOTES ...

Page 24: ...rinting and are subject to change without notice REMARKS a Do not touch the hot part or the hot and cold parts at the same time as you are liable to a shock hazard b Do not short circuit the hot and cold circuits as electrical components may be damaged c Do not connect an instrument such as an oscilloscope to the hot and cold circuits simultaneously as this may cause fuse failure Connect the earth...

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Page 28: ... Q856 F9 D865 I9 IC1104 C9 Q855 J5 D864 I10 IC1103 F8 Q854 B4 D863 G9 IC1102 D10 Q853 B4 D862 N10 IC1101 D8 Q852 B5 D861 J9 IC1051 A10 Q850 F5 D860 I10 IC852 I10 Q701 J5 D859 H5 IC851 G5 Q552 N3 D858 E5 IC850 H4 Q551 K1 D857 E5 IC801 G2 Q503 I2 D855 F4 IC701 K5 Q451 F8 D854 G4 IC601 L7 Q394 K9 D853 H3 IC451 L5 Q305 K9 D852 I4 IC251 D6 Q303 K9 D851 I4 TP S Q302 J9 D850 H4 TPE14 M5 Q301 K9 D806 G2 T...

Page 29: ...4 A7 Q353 G6 Q352 F6 Q351 F6 DIODES D906 F1 D905 G4 D904 D3 D902 G4 D901 G3 D364 C9 D363 C8 D362 B9 D361 B7 D360 D8 D359 G6 D358 E7 D357 F7 D356 G7 D355 F7 D354 G7 TEST POINTS TPY6 B8 TPY5 D5 TPY4 E5 TPY3 F6 TPY2 E7 TPY1 G6 IC S IC351 E8 26 H G F E D C B A 1 2 3 4 5 6 7 8 9 ...