Panasonic TX-20LA80F, Service Manual

Page 1: ...MHz D K 32 66MHz CZ STEREO 40 4MHz L 39 75MHz L NICAM 32 35MHz 32 9MHz NICAM Colour 34 47MHz PAL 34 5MHz 34 65MHz SECAM 38 3MHz 38 15MHz SECAM L Terminals AV1 IN Video 21 pin 1V p p 75Ω Audio 21 pin 500mV rms 10kΩ RGB 21 pin 0 7V p p 75Ω AV1 OUT Video 21 pin 1V p p 75Ω Audio 21 pin 500mV rms 1kΩ AV2 IN S Video IN Y 1V p p 75Ω 4 pin C 0 3V p p 75Ω Audio RCAx2 500mV rms 10kΩ Video RCAx1 1V p p 75Ω A...

Page 2: ... DEVICES 4 ABOUT LEAD FREE SOLDER PBF 5 SUGGESTED PB FREE SOLDER 5 SERVICE HINTS 6 CHASSIS BOARD LAYOUT 7 SETTING INSPECTION 7 SELF CHECK 8 ADJUSTMENT METHOD 9 BLOCK DIAGRAMS 10 PARTS LOCATION 13 REPLACEMENT PARTS LIST 14 SCHEMATIC DIAGRAMS 21 A BOARD SCHEMATIC DIAGRAM 22 P BOARD SCHEMATIC DIAGRAM 23 V BOARD SCHEMATIC DIAGRAM 24 CONDUCTOR VIEWS 25 2 ...

Page 3: ...lic part and measure the voltage at each point 5 Reserve the AC plug in the AC outlet and repeat each of the above measure 6 The potential at any point TOUCH CURRENT expressed as voltage U1 and U2 does not exceed the following values For a c U1 35 V peak and U2 0 35 V peak For d c U1 1 0 V Note The limit value of U2 0 35 V peak for a c and U1 1 0 V for d c correspond to the values 0 7 mA peak a c ...

Page 4: ...d can generate electrical charge sufficient to damage ES devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ES devices 6 Do not remove a replacement ES device from its protective package until immediately before you are ready to install it Most replacement ES devices are packaged with leads electrically shorted together by conductive foam alum...

Page 5: ... a higher melting point than standard solder Typically the melting point is 50 70 F 30 40 C higher Please use a high temperature soldering iron and set it to 700 20 F 370 10 C Pb free solder will tend to splash when heated too high about 1100 F or 600 C If you must use Pb solder please completely remove all of the Pb free solder on the pins or solder area before applying Pb solder If this is not p...

Page 6: ... Pedestal assembly Lay the main unit face down see Fig 5 Remove the 4 fixing screws and the pedestal assembly see Fig 6 How to remove the backcover Remove the 10 fixing screws see Fig 7 Fig 5 Fig 6 SCREWS SCREWS Fig 7 6 SCREWS SCREWS ...

Page 7: ...onfirm the following voltages A board Normal mode Test point Position Voltage Description TP025 C888 5V 0 25V 5V TP024 C891 8 2V 0 5V 8V TP031 R874 30V 2V 30V Standby mode TP029 C868 pin 3 3V 0 2V STBY3 3V TP030 C864 pin 1 8 0 15 STBY1 8V TP025 C888 2V 5V P board Normal mode TP842 Q843 23 8V 1V 24V switched TP840 Connector P2 pin12 9 8V 1 12V TP3802 IC3802 pin1 15V 1V 15V TP3800 IC3801 pin4 4 3V 0...

Page 8: ...0 OPTION 3 A0 OPTION 4 11 OPTION 5 00 OPTION 6 05 OPTION 7 DD OPTION 8 D2 OPTION 9 00 OPTION 10 20 OPTION 11 11 OPTION 12 00 OPTION 13 08 CHECK AD E2 O K VCTP O K TUN O K Chassis 22 Model 01 Size 20 VCTP B3 Self Check Complete Panasonic GLP21L TX 20LA80F TX 20LA80FS Display Ref No Description P C B E2 IC1120 EAROM A Board VCTP IC1501 AUDIO VIDEO TEXT PROCESSOR A Board TUN TU001 TUNER A Board If th...

Page 9: ... press Blue button wait until the figure colour is changed from red to black colour Press the OK DVCO DVCO 63 Receive a 80 white level Philips Pattern via aerial input For DVCO alignment press Blue button wait until the figure colour is changed from red to black colour Press the OK Highlight Lowlight For correct setting see White Balance Adjustment Sub Brightness Sub Brightness 5 Optimum setting W...

Page 10: ... L OUT 10 AV1 L IN 179 AV1 BLUE IN AV1 GREEN IN 180 AV1 RED C IN 181 AV1 CVBS IN 190 AV1 CVBS OUT 195 R L V L R Y C 13 AV3 R IN AV3 L IN 14 AV3 CVBS IN 182 188 AV3 Y IN AV3 C IN 187 IC 251 AUDIO AMP SPK L SPK R 28 27 2 4 A5 R L SPK OUT R 8 9 SPK OUT L SPKR R 11 12 SPK OUT R SPK OUT L SPKR L 4 1 2 3 IC 1120 EEPROM 168 7 WR EN VCT6753G AUDIO VIDEO TEXT PROCESSOR A BOARD B BUS G BUS R BUS TO LCD PANE...

Page 11: ... P2 16 18 20 1 2 2 90 162 PWM OUT INVERTER OFF INV PSU ON KEYSCAN Q1100 LEVEL SHIFTER SERVICE CONNECTOR IC 1120 EEPROM SCL3V3 AUDIO MUTE AUDIO MUTE KEYSCAN NOT STBY Q841 NOT STBY Q842 Q843 INV PSU ON INVERTER 205 ON LED IR 208 STBY LED V2 2 1 3 D1051 G R RM1050 REMOTE IR P BOARD V BOARD PROTECTION 7 IC 251 AUD AMP 83 6 5 7 WR EN SDA 3V3 84 SDA3V3 A BOARD 201 SDA INT 168 2 205 BUS REQUEST Q952 INVE...

Page 12: ... 3 3V IC862 STBY3 3V IC861 STBY1 8V VSUPDIG 1 8V VSUPFE 1 8V LCF S LCF VSUPAU 8V IC1501 33 36 45 75 77 86 96 114 124 133 150 164 169 185 170 192 197 VSUPSIF 5V VSUPDIG 3 3V VSUPDRI 3 3V VSUPCOM 3 3V VSUPIO1 3 3V VSUPDIG 1 8V VSUPLVDS 3 3V VSUPDAC 3 3V VSUPFE 1 8V VSUPFE 3 3V VSUPVO 3 3V VSUPIO3 3 3V AUDIO VIDEO PROCESSOR IC251 AUDIO AMP 5V AUD9V_16V TUNER TU001 30V 5V IC1120 EEPROM 7 5 8 STBY3 3V ...

Page 13: ...Parts Location NOTE The numbers on the exploded view below refer to the exploded view section of the Replacement Parts List 13 5 10 19 9 16 11 8 15 4 3 17 18 7 2 12 1 13 4 14 6 ...

Page 14: ...A METAL TKZX5181 1 TAB RELEASE CABLE TMM8E18048 PAD FOR REMOTE CONTROL TPD0E9100 SCREW XTB3 10JFJK SCREW XTB4 10JFJ SCREW XTB4 15JFJK SCREW XTB4 18JFJK SCREW XTS3 8JFJ SCREW XTW3 10TFJ BOTTOM CUSHION BOTCUS TPD0E0164 CARTON CARTON TPC0E51700 FERRITE CORE FC1 J0KG00000054 FERRITE CORE FC2 J0KG00000100 TOP CUSHION TOPCUS TPD0E0163 INSTRUCTION BOOKS GERMAN TQB0E0682A DUTCH TQB0E0682B ITALIAN TQB0E068...

Page 15: ...CCK000005 DIODE D3845 B0ACCK000005 DIODE D3863 MAZ80620ML ZENER DIODE D3864 MAZ80820HL DIODE D3865 B0ACCK000005 DIODE D3866 B0ACCK000005 DIODE D3867 B0ACCK000005 TRANSISTORS TRANSISTOR Q122 BC847B TRANSISTOR Q123 BC847B TRANSISTOR Q250 BC847B TRANSISTOR Q251 B1ADCE000023 TRANSISTOR Q253 B1ADCE000023 TRANSISTOR Q254 B1ADCE000023 TRANSISTOR Q255 B1ADCE000023 TRANSISTOR Q256 BC847B TRANSISTOR Q257 BC...

Page 16: ...EYJ103 0 1W 5 10K Ω SMD R261 ERJ8GEYJ332V 0 25W 5 3K3 Ω SMD R262 ERJ3GEYJ102 0 1W 5 1K Ω SMD R263 ERJ3GEYJ562 0 1W 5 5K6 Ω S M CARB R264 ERJ6GEYJ472 0 1W 5 4K7 Ω SMD R275 ERJ3GEYJ103 0 1W 5 10K Ω SMD R276 ERJ3GEYJ103 0 1W 5 10K Ω SMD R279 ERJ3GEYJ272 0 1W 5 2K7 Ω SMD R280 ERJ3GEYJ272 0 1W 5 2K7 Ω SMD R281 ERJ3GEYJ331 0 1W 5 330 Ω SMD R282 ERJ3GEYJ103 0 1W 5 10K Ω SMD R283 ERJ3GEYJ331 0 1W 5 330 Ω ...

Page 17: ... R1538 ERJ3GEYJ103 0 1W 5 10K Ω SMD R1539 ERJ3GEYJ103 0 1W 5 10K Ω SMD R1542 ERJ3GEYJ472 0 1W 5 4K7 Ω SMD R1544 ERJ3GEYJ103 0 1W 5 10K Ω SMD R1545 ERJ3GEYJ220 0 1W 5 22 Ω SMD R1546 ERJ3GEYJ220 0 1W 5 22 Ω SMD R1548 ERJ3GEYJ101 0 1W 5 100 Ω SMD R1551 ERJ3GEYJ101 0 1W 5 100 Ω SMD R1555 ERJ3GEYJ151 0 1W 5 150 Ω SMD R1557 ERJ3GEYJ151 0 1W 5 150 Ω SMD R1558 ERJ3GEYJ101 0 1W 5 100 Ω SMD R1559 ERJ3GEYJ10...

Page 18: ...1502V 0 1W 1 15K Ω SMD R3871 ERJ3EKF1502V 0 1W 1 15K Ω SMD R3872 ERJ3EKF1502V 0 1W 1 15K Ω SMD R3873 ERJ3EKF1502V 0 1W 1 15K Ω SMD R3874 ERJ3EKF6801V 0 1W 1 6K8 Ω S M CARB R3876 ERJ6GEYJ103 0 1W 5 10K Ω SMD R3877 ERJ3GEYJ333V 0 1W 5 33K Ω S M CARB R3880 ERJ6GEYJ103 0 1W 5 10K Ω S M CARB R3881 ERJ6GEYJ823 0 1W 5 82K Ω SMD R3882 ERJ3GEYJ103 0 1W 5 10K Ω S M CARB R3884 ERJ3GEYJ153V 0 1W 5 15K Ω S M C...

Page 19: ...CAP C1526 ECJ1VB1H104 50V 100nF S M CAP C1527 ECJ1VB1H103 50V 10nF S M CAP C1528 ECJ1VB1H103 50V 10nF S M CAP C1529 ECJ1VB1H104 50V 100nF S M CAP C1530 ECJ1VB1H103 50V 10nF S M CAP C1531 ECJ1VC1H100D 50V 10pF S M CAP C1532 ECJ2VB1C104K 16V 100nF S M CAP C1533 ECJ1VB1C563K 16V 56nF S M CAP C1534 ECJ2FB0J106M 6 3V 10µF S M CAP C1535 ECJ1VC1H330J 50V 33pF S M CAP C1536 ECJ1VB1H103 50V 10nF S M CAP C1...

Page 20: ...100DGE 6KV 10pF S M CAP C3844 ECJ2VB1H472K 50V 4 7nF CERAMIC C3845 ECCN3J100DGE 6KV 10pF S M CAP C3846 ECJ2VB1H472K 50V 4 7nF S M CAP C3848 ECJ2VB1H472K 50V 4 7nF S M CAP C3849 ECJ2VB1H472K 50V 4 7nF S M CAP C3850 ECJ2VB1H472K 50V 4 7nF S M CAP C3851 ECJ2VB1H472K 50V 4 7nF S M CAP C3852 ECJ2VB1H472K 50V 4 7nF S M CAP C3853 ECJ2VB1H472K 50V 4 7nF S M CAP C3854 ECJ2FB1H104 50V 100nF S M CAP C3855 EC...

Page 21: ... 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 instruments to ...

Page 22: ...TE 17 JSA090 0 GND L253 J0JJC0000015 CL1562 C277 16V 47u R1527 75 Q123 BC847B CSP GND C1546 0 47u 16V C1541 10u 16V C265 16V 0 22u C1502 0 1u 50V ECJ1VB1H104K CSP R125 10k GND R255 2 2 GND C882 0 1u 50V GND R3894 47k GND R904 0 GND D3866 B0ACCK000005 C1534 10u 6 3V GND R283 330 R1565 EXB28V560JX C1506 10u 6 3V GND JSA268 0 R882 10k C1538 50V 0 01u De coupling pin 77 GND GND GND D252 1N4148WS L1523...

Page 23: ...17 TRAFFO TP3801 D3836 1SS355TE 17 TRAFFO R3866 10k D849 SD83304TE12R R3834 4 7k C3802 2 16V R806 1 5k 1 R3814 10k R3831 10k R3835 47k C3849 4700p 50V 1 25X2 0 SW1074 EVQPC105K Q844 BC847B C847 0 082u 25V Q3806 IMZ2A R816 2 2 5W D3837 1SS355TE 17 R817 10k 2 0 x 1 25 R3870 15k 1 C3831 10u 10V R3871 15k 1 C3854 0 1u 50V D842 B0ACCK000005 1SS355TE 17 R3853 100k R3828 1k R3848 1M R3802 47k R1070 6 8k ...

Page 24: ... 1 2 3 RM1050 PNA4701M05TV C1054 27p 50V R1057 22 2 0 x 1 25 C1052 6 3V 10u V2 1 2 3 4 5 GND R1056 22 GND GND R1055 10k D1062 MAZ80820ML R1058 470 1 4W ERDS2TJ471T GREEN RED STBY_LED ON_LED IR GND 3 3VSTBY TO A8 VCC GND VOUT I V BOARD TNP0EV008 24 ...

Page 25: ...4 D3 Q257 C2 D3865 D3 Q873 D1 D3866 D3 Q952 D3 D3867 D3 Q1100 B4 Q1217 C3 IC S Q1700 D3 IC251 D4 Q1701 D3 IC861 C1 Q3205 A2 IC862 D1 Q3860 D3 IC881 D1 Q3861 D3 IC1120 B2 Q3862 D3 IC1500 2C IC1501 2C DIODE S D251 D4 TP S D252 D4 TP022 2D D254 D4 TP021 3D D866 D1 TP031 3C Conductor Views A BOARD TNP0EA008 top 1 2 3 4 A B C D 25 ...

Page 26: ...72 D1 D1700 D3 Q881 D1 Q882 D1 TP S Q883 D2 TP005 C1 Q890 D3 TP017 C1 Q1212 A4 TP019 D1 Q3202 A2 TP020 D1 TP023 C1 DIODE S TP024 D2 D250 D4 TP025 D2 D872 D1 TP029 C1 D878 D1 TP030 C1 D879 D1 TP801 B3 D890 D2 1 2 3 4 A B C D A BOARD TNP0EA008 bottom 26 ...

Page 27: ... D2 D3829 B2 Q3805 B3 D849 D4 D3830 B2 Q3806 A4 D3800 B3 D3831 B1 Q3807 A3 D3801 B6 D3832 B1 Q3808 A2 D3802 B3 D3833 B1 Q3809 A3 D3803 A4 D3834 B5 D3804 A3 D3835 B5 TP S D3805 B6 D3836 B5 TP840 D4 D3806 B6 D3837 B5 TP841 D4 D3807 B6 D3838 B5 TP842 C2 D3808 B6 D3839 B5 TP843 D2 D3809 B5 D3840 B2 TP844 D3 D3810 B5 D3841 B2 TP845 D3 D3811 B2 D3842 B2 TP846 D3 D3812 B2 D3843 B1 TP3800 A3 D3813 B2 D384...

Page 28: ...1 2 A DIODE S D1051 A2 D1062 A2 IC S RM1050 A2 V BOARD TNP0EV008 top 28 ...