Panasonic TX-W28R4L Service Manual Download | Manualshive

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AUDIO BLOCK DIAGRAM

10

TUNER

Q101

Q102

AV2

AV1

SC3_IN_L 37

SC1_OUT_R 30

SC1_OUT_L 31

1 R OUT

3 L OUT

1 R OUT

3 L OUT

2 R IN

6 L IN

2 R IN

6 L IN

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

E - BOARD

Q2303

AV3

L

R

6 R

4 L

HEADPHONE

7 R

5 L

M4

1

M5

3

E16A M1

1

1

2

2

Q2102

Q2103

E17

M2

10

10

8

8

M - BOARD

2 L

3 R

Q2301

AUDIO

MONITOR

OUT

Q2304

Q2302

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Summary of Contents for TX-W28R4L

Page 1: ... PC to allow a number of diagnostic and control functions to be performed For more details contact your local Panasonic company BACK EXIT TX W28R4L 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 M Schematic H Schematic Y Schematic E PCB Y PCB M PCB Audio Power supply Control Video ...

Page 3: ... 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 1V p p 75Ω Audio 21 pin 500mV rms 1kΩ Selectable Output 21 pin AV3 IN S Video IN Y 1V p p 75Ω 4 pin C 0 3V p p 75Ω Audio RCAx2 500mV rms10kΩ Video RCAx1 1V p p 75Ω High Voltage 30 5kV 1kV Picture Tube A66ECF50X41 66cm Audio Output 2 x 20W Music Power 8Ω Impedance Headphones 8Ω Impedance 3...

Page 4: ...d metallic cabinet part 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 isolati...

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 M Board E Board Y Board Focus Screen H Board Fig 3 ...

Page 6: ...chassis toward you as shown in Fig 4 3 Release the respective wiring clips and rotate the chassis vertically through 90 anti clockwise 4 Locate the base of the chassis frame into the hole B shown in Fig 6 5 Clip the chassis frame onto the bead clamper as shown in Fig 5 6 After servicing replace the bead clamper and ensure all wiring is returned to its original position before returning the receive...

Page 7: ...switch the TV on 2 Enter 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 proc...

Page 8: ... TV set at the power button Self Check is also used to automatically check the bus lines and hexadecimal code of the TV set If the CCU ports have been checked and found to be incorrect or not located then will appear in place of O K For more in depth TV diagnostics use the LUCI interface as listed below Service Aids To aid in the service of our current chassis there are a number of Service Aids wh...

Page 9: ...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 10: ...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 11: ...HG OXH UHHQ 9LGHR Q 9 9LGHR 2XW G OUT 38 R OUT 37 G IN 46 R IN 45 Q354 VM COILS Q905 Q907 Q909 Q908 Q906 SVM OUT 34 E8 4 3 5 Y2 4 3 5 7 7 Q3001 G 38 B 39 Y BOARD E BOARD VIDEO PROCESSOR MICRO PROCESSOR H3 E61 1 1 H BOARD 9 AV3 M2 E17 6 6 Y C M BOARD Q305 Q303 Q301 3 2 1 7 8 9 IC351 Q306 Q304 Q302 Q950 Q951 RGB OUTPUT IC3401 8 3 VIDEO SWITCHING 6 4 4 M3 H2 4 4 8 8 2 2 6 6 Q3402 Q3201 Q3203 Q3204 Q3...

Page 12: ...IN 6 L IN 47 ANA_IN1 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 21 DACA_R 22 DACA_L E BOARD AUDIO PROCESSOR Q2303 AV3 L R 6 R 4 L HEADPHONE 7 R 5 L M4 1 M5 3 E16A M1 1 1 2 2 IC251 5 R R 7 2 L L 11 AUDIO OUTPUT Q2102 Q2103 E17 M2 10 10 8 8 M BOARD 2 L 3 R Q2301 AUDIO MONITOR OUT Q2304 Q2302 ...

Page 13: ...1106 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 IC2101 8 7 4 AUDIO PROCESSOR MICRO PROCESSOR VIDEO PROCESSOR EAROM M BOARD D1061 Q3401 IC1061 LED RECEIVER SCL M2 E17 5 5 M1 E16A 8 8 7 7 Q1051 Q1062 5 5 6 6 Q3205 Q3206 Q3201 Q3203 Q3204 LOCAL KEYS SWITCH ...

Page 14: ...14V 14V 27V 150V 29V 7V 15V 5V D867 Q852 Q854 Q855 1 D805 R805 R814 IC850 1 2 D862 R854 33V 16 M BOARD IC1104 2 RESET MICRO PROCESSOR AUDIO PROCESSOR VIDEO PROCESSOR EPROM EAROM RESET ERROR AMPLIFIER 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 M1 9 E16A 9 E1 4 1 E2 2 1 R802 DEGAUSS COIL Line Filter E62 1 H3 2 Q253 IC10...

Page 15: ...PARTS LOCATION 13 24 3 21 13 12 1 16 19 15 4 8 5 14 7 25 6 23 20 11 2 9 10 17 18 22 NOTE The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List ...

Page 16: ...K UM 3DJ 2P TV STAND VS WR4 ANODE LEAD ZTUZAE550A RELAY RL801 TSE1885 1 THERMISTOR R802 232266296706 C R T SOCKET S351 0330550049 INSTRUCTION BOOKS ENGLISH TQB8E2616 1 I C s AUDIO OUTPUT IC251 LA4282 R G B OUTPUT IC351 TDA6103Q N3 VERTICAL OUTPUT IC451 LA7845N VIDEO PRCESSOR IC601 VDP3120BPPB1 E W CORRECTION IC701 TEA2031A POWER SUPPLY IC801 STRF6654LF51 ERROR AMPLIFER IC850 SE140N 12V REGULATOR I...

Page 17: ... Q303 BC847B TRANSISTOR Q304 FMY4T148 TRANSISTOR Q305 BC847B TRANSISTOR Q306 FMY4T148 TRANSISTOR Q351 2SA1767 TRANSISTOR Q352 2SA1767 TRANSISTOR Q353 2SA1767 TRANSISTOR Q354 BC857B TRANSISTOR Q451 BC857B TRANSISTOR Q503 2SD2398 M2 TRANSISTOR Q551 BU2508AXLB TRANSISTOR Q552 2SC1473 RN TRANSISTOR Q701 BC857B TRANSISTOR Q850 2SD1273PLB TRANSISTOR Q851 BC857B TRANSISTOR Q852 2SC1383 S TRANSISTOR Q853 ...

Page 18: ... 0 S M CARB JA28 ERJ6GEY0R00 0 1W 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 JA36 ERJ6GEY0R00 0 1W 5 0 S M CARB JA37 ERJ6GEY0R00 0 1W 5 0 S M CARB JA38 ERJ6GEY0R00 0 1W 5 0 S M CARB JA3...

Page 19: ... 2K2 S M CARB R456 ERJ6GEYJ104 0 1W 5 100K S M CARB R457 ERJ6GEYJ223 0 1W 5 22K CARBON R458 ERD25TJ1R5 0 25W 5 1R5 S M CARB R459 ERJ6GEYJ101 0 1W 5 100 CARBON R460 ERDS1TJ331 0 5W 5 330 WOUND R461 ERW2PK1R2 2W 10 1R2 CARBON R463 ERD25TJ222 0 25W 5 2K2 S M CARB R464 ERJ6GEYJ182 0 1W 5 1K8 S M CARB R465 ERJ6GEYJ681 0 1W 5 680 S M CARB R502 ERJ6GEYJ511 0 1W 5 510 CARBON R506 ERD25TJ560 0 25W 5 56 MET...

Page 20: ... ERJ6GEYJ472 0 1W 5 4K7 S M CARB R1111 ERJ6GEYJ473 0 1W 5 47K S M CARB R1112 ERJ6GEYJ473 0 1W 5 47K S M CARB R1113 ERJ6GEYJ101 0 1W 5 100 S M CARB R1115 ERJ6GEYJ471 0 1W 5 470 S M CARB R1116 ERJ6GEYJ101 0 1W 5 100 S M CARB R1117 ERJ6GEYJ101 0 1W 5 100 S M CARB R1118 ERJ6GEYJ472 0 1W 5 4K7 S M CARB R1119 ERJ6GEYJ472 0 1W 5 4K7 S M CARB R1120 ERJ6GEYJ101 0 1W 5 100 S M CARB R1121 ERJ6GEYJ101 0 1W 5 ...

Page 21: ... 0 1W 5 22K S M CARB R3213 ERJ6GEYJ102 0 1W 5 1K S M CARB R3214 ERJ6GEYJ683 0 1W 5 68K S M CARB R3215 ERJ6GEYJ302 0 1W 5 3K S M CARB R3216 ERJ6GEYJ750 0 1W 5 75 S M CARB R3217 ERJ6GEYJ223 0 1W 5 22K S M CARB R3218 ERJ6GEYJ223 0 1W 5 22K S M CARB R3219 ERJ6GEYJ102 0 1W 5 1K S M CARB R3220 ERJ6GEYJ683 0 1W 5 68K S M CARB R3221 ERJ6GEYJ302 0 1W 5 3K S M CARB R3222 ERJ6GEYJ223 0 1W 5 22K S M CARB R322...

Page 22: ...KBX 50V 15nF S M CAP C611 ECUV1H153KBX 50V 15nF S M CAP C612 ECUV1H153KBX 50V 15nF S M CAP C613 ECUV1H153KBX 50V 15nF S M CAP C614 ECUV1H050CCX 50V 50pF S M CAP C615 ECUV1H050CCX 50V 50pF ELECT C616 ECA1HM101GB 50V 100µF S M CAP C617 ECUV1H223KBX 50V 22nF ELECT C618 ECA1CM221GB 16V 220µF ELECT C619 ECJ2VB1H473K 350V 47nF ELECT C620 ECA1HM101GB 50V 100µF ELECT C621 ECJ2VB1C104K 350V 100nF S M CAP C...

Page 23: ...DTX 50V 70pF S M CAP C2125 ECUV1H470JCX 50V 47pF S M CAP C2126 ECUV1H070DTX 50V 70pF S M CAP C2127 ECUV1H010CCX 50V 1pF S M CAP C2128 ECUV1H010CCX 50V 1pF ELECT C2129 ECA1CM102B 16V 1pF ELECT C2130 ECA1CM331B 16V 330µF S M CAP C2131 ECUV1H103ZFX 50V 10nF S M CAP C2132 ECUV1H103ZFX 50V 10nF S M CAP C2134 ECUV1H103ZFX 50V 10nF ELECT C2135 ECA1HM101GB 50V 100µF ELECT C2136 ECJ2VF1H104Z 350V 100nF ELE...

Page 24: ...50V 220nF S M CAP C3405 ECUV1H180JCX 50V 18pF S M CAP C3406 ECUV1H271JCX 50V 270pF S M CAP C3407 ECUV1H271JCX 50V 270pF ELECT C3408 ECA1HM101GB 50V 100µF ELECT C3601 ECA1HM101GB 50V 100µF S M CAP JSE28 ECUV1H104KBX 50V 100nF TERMINALS AND LINKS RCA HEADPHONE JACK JK2301 JPJ841101320 A V TERMINAL JK3201 TJB16656 SWITCHES SWITCH S802 ESB92S11B SWITCH S1251 EVQ23405R SWITCH S1252 EVQ23405R SWITCH S12...

Page 25: ... 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 of the...

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Page 30: ... 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 31: ...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 28 H G F E D C B A 1 2 3 4 5 6 7 8 9 ...

Page 32: ...013 TRANSISTORS Q1061 C2 Q1062 C2 Q3201 C8 Q3202 B9 Q3203 B8 Q3204 B9 Q3205 B9 Q3206 A9 Q3207 B10 Q3208 B9 Q3209 B10 DIODES D1061 C1 D3201 B4 D3202 B4 D3203 B3 IC S IC1601 D2 C B A 1 2 3 4 5 6 7 8 9 11 12 13 10 D 29 ...

Page 33: ...NOTES 30 ...

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