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Panasonic TC20LA5 - 20" LCD COLOR TV, Service Manual, Page: 5 / 40

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Panasonic TC20LA5 - 20

3 Location of Controls and Components

Board Name

Function

A-Board

Main (AV Switch, Audio, MCU, Grobal Core, AV connector )

R-Board

Remote Reciever

V-Board

Headphone, Speaker, LED

TA-Board

Tuner, MTS

Power Unit

Power (AC/DC), Switch
None serviceable.
Power Unit should be exchange for service.

5

TC-20LA5 / TC-20LE5

Summary of Contents for TC20LA5 - 20" LCD COLOR TV

Page 1: ...rage use 56 W Stand by condition 0 11 W Power off 0 10 W LCD 20 inch 510 mm 4 3 aspect ratio LCD panel Screen Size 16 06 408 0 mm W 12 05 306 0 mm H Channel Capability VHF 12 UHF 56 Cable 125 Sound Speaker 4 cm 2 pcs 16 W Headphones M3 3 5 mm Jack 1 FEATURES 3D Y C Digital Comb Filter CLOSED CAPTION V Chip Operating Conditions Temperature 41 F 95 F 5 C 35 C Humidity 5 90 RH non condensing ORDER NO...

Page 2: ...1 Schematic Diagram Notes 19 10 2 A Board 1 of 5 Schematic Diagram 20 10 3 A Board 2 of 5 Schematic Diagram 21 10 4 A Board 3 of 5 Schematic Diagram 22 10 5 A Board 4 of 5 Schematic Diagram 23 10 6 A Board 5 of 5 Schematic Diagram 24 10 7 R TA and V Board Diagram 25 11 Printed Circuit Views 27 11 1 A Board 27 11 2 R V and TA Board 30 12 Exploded View and Replacement Parts List 31 12 1 Exploded Vie...

Page 3: ...r servicing make the following leakage current checks to prevent the customer from being exposed to shock hazards 2 Warning 2 1 Prevention of Electro Static Discharge ESD to Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES device...

Page 4: ... Pb free solder as well although Pb solder may be used PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the back of PCB Caution Pb free solder has 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 w...

Page 5: ... Function A Board Main AV Switch Audio MCU Grobal Core AV connector R Board Remote Reciever V Board Headphone Speaker LED TA Board Tuner MTS Power Unit Power AC DC Switch None serviceable Power Unit should be exchange for service 5 TC 20LA5 TC 20LE5 ...

Page 6: ...g on models After entering the adjustment mode take note of the value in each item before starting adjustment Main item Sub item Remarks Sample Data MAIN Y GAIN Video level RF video component 5E B Y Video level RF video component C7 R Y Video level RF video component 50 SUB COLOR Sub color 23 TINT Sub tint 00 BACK L Sub Back light 152 BRIGHT Sub Bright 800 B Y G B Y Gain 3B R Y A R Y demodulation ...

Page 7: ...s caption data and some other user defined settings will be erased and return to factory setting 5 1 1 How to access 5 1 1 1 Access Produce TV reception screen and while pressing VOLUME button on the main unit press SLEEP button on the remote controller unit simultaneously 5 1 1 2 Exit When one of the buttons for channel selection etc is pressed the display returns to the normal screen 5 1 2 Scree...

Page 8: ... 5 Remove the stand metal 6 2 Removing the pedestal assembly TC 20LA5 only 1 Remove the 4 screws 2 Remove the pedestal assembly 6 3 Removing the rear cover 1 Remove the 2 screws 2 Remove the 8 screws 3 Remove the rear cover 6 4 Removing the control button assembly 1 Remove the 2 screws 2 Remove the control button assembly 6 Disassembly and Assembly Instructions 8 TC 20LA5 TC 20LE5 ...

Page 9: ...ler wire 3 Remove the chassis assembly 6 6 Removing the A Board TA Board and Power unit 1 Remove the 12 screws 2 Remove the A Board TA Board and Power unit 6 7 Removing the speaker and the pedestal bracket 1 Remove the 12 screws 2 Remove the pedestal bracket 3 Disconnect speaker terminal 4 Remove the speaker 9 TC 20LA5 TC 20LE5 ...

Page 10: ...el R Board and V Board 1 Remove the 4 screws 2 Remove the LCD Panel 3 Remove the 2screw 4 Remove the R Board and V Board 6 9 Removing the LCD mount metal 1 Remove the 4 screws 2 Remove the LCD mount metal 10 TC 20LA5 TC 20LE5 ...

Page 11: ...ead Wiring 1 Put a ferrite core to the A11 coupler wires then wrap a ferrite core with a felt See Fig 1 2 Put a ferrite core to the R1 V1 coupler wires then wrap a ferrite core with a felt See Fig 1 11 TC 20LA5 TC 20LE5 ...

Page 12: ...12 TC 20LA5 TC 20LE5 ...

Page 13: ...adjustment is not required normal select two color R GAIN or G GAIN or B GAIN but no use standard color 0xff objective of coordinate x0 y0 0 277 0 002 0 279 0 002 Standard color 1 2 RED GREEN BLUE x direction B GAIN 1 R GAIN 2 R GAIN 1 y direction G GAIN 2 B GAIN 1 G GAIN 2 When turn up R GAIN and G GAIN chromaticity coordinate get bigger When turn up B GAIN chromaticity coordinate get smaller Whe...

Page 14: ... jig 1 Select STEREO mode in the AUDIO Menu 2 Set Audio volume DAC to 40 3 Apply following RF signal at Antenna input VIDEO Flat field 30 modulation AUDIO 300Hz 30 modulation STEREO LEFT only 70dB 5dB 75 W OPEN P S 10dB Note After setting 30 modulation with PL SW and NR SW off turn PL SW and NR SW on 4 Adjust SEPAL data Low level separation until the amplitude 5 Apply following RF signal at Antenn...

Page 15: ...1 TREBLE AUDIO SCL AUDIO 16 5V S 11 PC91 9V S 41 R A2 BTL POWER SUPPLY UNIT 9 2 TV V 10 22V 6 PRESET Pr OUT 51 10V 2 5V M CONTROL L COMPONENT1 R 8 6dB AMP 11V S DET T91 25 5V GENE 6 VOL 5V S DET 5 32V S2 DET 9V S 11 9V S DET IC901 29 24 POWER SWITCH V Y 3 3V 52 AUDIO 1 14 16 BUFFER 2 IC903 17 A BOARD 17 COLD L TV_V 1 12V 7 PR V Y 8 6dB 2 CH SWITCH REG 5V HOT TEMP SENSOR 3 KEY SCAN 1 S CLOCK L OUT ...

Page 16: ...INV ON APWM 5V PANEL Q4019 Q4021 20 2 Q4014 Q4016 SYNC SEP R_ch HEADPHONE MUTE 13 OSD R MUTE I F1 IC4009 DET OSD YS 2 5V AD 5 5 A8 SKEW PIXEL CONV CORR HS VS S CLOCK2 RX0 L_ch INTERFACE R G B RX1 AUDIO OUT 7 SRQ RX0 STANDBY R 2 5V M AVR OSD 50 S DATA3 3 3V M Y C SEP V SCALE DEMODU SP_L CHROMA EEPROM 2 5V AD HP L 4 71 WP 7 RGB 4 RX2 R VOL ADJ H SCALE AVR SDA 8 Y GAMMA LEVEL SHIFT S DATA0 13 STBY 3 ...

Page 17: ..._L 14 3 2 15 4 2 8 1 4 1 5V Prog A2 3 12 5 3 9 13 9 4 9 20 FACTORY USED 1 4 S CLOCK3 9 20 11 5 15 12 3 4 7 10 16 8 2 17 6 18 13 14 19 1 A11 PANEL5V PANEL5V GND GND RX3 RX3 GND RXCLK RXCLK GND RX2 RX2 GND RX1 RX1 GND RX0 RX0 GND DCC GND REMOTE STBY3 3V LED_R STBY3 3V LED_G GND GND AFT_OUT SCL1 SDA1 TV R GND GND GND GND TV L 5V 30V GND GND GND GND GND TV_V 24V INV_GND INV_GND AI 24V PWM SETTING PDIM...

Page 18: ...TC 20LA5 TC 20LE5 18 ...

Page 19: ...10 Schematic Diagrams 10 1 Schematic Diagram Notes TC 20LA5 TC 20LE5 19 ...

Page 20: ... R3084 220 R3006 10k MAZ81000HL D051 C3017 10V 1u R3091 10k C3082 50V 1000p C3014 50V 0 01u R1130 0 C3004 6 3V 10u C3076 50V 0 1u R3023 1k R3037 220 C3018 10V 1u IC3001 AN15857A AN15857A 1 MUTE 2 CV 1 3 S2 3 4 L 1 5 R 1 6 SC 1 7 SDET 1 8 SY 1 9 L 2 10 CV 2 11 R 2 12 SC 2 13 SDET 2 14 SY 2 15 L 3 16 CV 3 17 R 3 18 SC 3 19 SDET 3 20 SY 3 21 L 4 22 R 4 23 AGC 24 CV 4 25 DDET 1 26 Y 1 27 L 5 28 U 1 29...

Page 21: ...MDO0 6 YUVHPO VP 7 YUVVPO HP 8 YUVO9 9 YUVO8 10 VDDI 11 VSS 12 VDDE 13 YUVO7 14 YUVO6 15 YUVO5 16 YUVO4 17 YUVO3 18 YUVO2 19 YUVO1 20 YUVO0 21 VDDI 22 VSS 23 VDDE 24 FRCLKIN 25 SCL 26 SDA 27 VPD 28 TMS 29 TDI 30 VDDI 31 VSS 32 VDDE 33 NRST 34 EXVPIN 35 EXHPIN 36 TDO 37 AVSAD12 38 AVDAD12 39 AVSAD11 40 AVDAD11 41 VRH1 42 VIN1 43 VRL1 44 AVSAD22 45 AVDAD22 46 AVSAD21 47 AVDAD21 48 VRH2 49 VIN2 50 VR...

Page 22: ... 3V C4234 16V 0 1u L4020 J0JGC0000021 C4233 16V 0 1u R4248 1k C4223 16V 0 1u R4329 2k JS4016 C1AB00001958 IC4014 1 SDA 2 SCL 3 FRCLKOUT 4 VDDE 5 VSS 6 YUVIN0 7 YUVIN1 8 YUVIN2 9 YUVIN3 10 YUVIN4 11 YUVIN5 12 YUVIN6 13 YUVIN7 14 YUVIN8 15 YUVIN9 16 YUVVIN 17 YUVHIN 18 VDDI 19 VSS 20 VDDE 21 YUVCLKIN 22 MDIN0 23 MDIN1 24 MDIN2 25 MDIN3 26 MDIN4 27 MDIN5 28 MDIN6 29 VDDI 30 MDIN7 31 MDIN8 32 MDIN9 33...

Page 23: ...0 JS901 0 R912 0 C916 16V 0 1u TP917 C941 50V 0 1u R900 33 C915 16V 220u R4295 1k C905 16V 470u D902 B0JANG000003 RK36LFC4 C943 50V 4700p 1 R928 39k SUB9V C914 10V 1u R930 0 R927 1k 1 JS903 0 C4285 50V 0 01u 1 R917 82k C939 6 3V 680u R952 5 6k L904 100u C929 330u 16V R4285 0 R4281 0 R4265 EXB38V101JV R4273 EXB38V101JV R4289 0 C4280 50V 0 1u C4277 50V 0 01u C4275 50V 0 01u R949 3 9k 1 R936 1k R4286...

Page 24: ...1022 10V 1u R1008 2 7k R1056 100 5 R1107 3 3k STBY3 3V R1098 4 7k R1125 22 C1076 6 3V 1u Q1008 UNR521100L C1031 16V 0 1u SUB5V R1030 2 7k Q1002 2SC584500L MAIN5V C1046 50V 0 01u R1035 430 C1010 10V 1u R1024 2 7k R1104 100 C1024 50V 12p R1110 2 7k C1048 10V 1u C1083 10V 1u R1141 100 R1065 1k R1059 100 C1006 10V 1u C1007 16V 0 022u R1099 100 R1040 47k C937 10V 1u R1126 22 R1005 47k R1123 10k R1047 1...

Page 25: ...0 1u TP021 TA2 1 2 3 4 5 6 7 8 9 C008 16V 0 1u C2208 3 3u 16V C2213 10V 2 2u R2201 22 R002 22 C2211 25V 10u TU001 ENG36A16GF NC 1 AGC_ADJ 2 B_ 5V 3 NC 4 NC 5 NC 6 BT 7 RF AGC 8 IF_OUT 9 SCL 10 SDA 11 AFT 12 AUDIO OUT 13 NC_ SIF OUT 14 BTL_ 30V 15 AGC_CONT 16 VIDEO_OUT 17 C2210 10V 1u C2209 50V 0 022u TP020 TA1 1 2 3 4 5 6 7 8 9 L001 47u TP012 TP011 R016 2 2k C002 16V 470u C027 16V 0 22u TP016 C220...

Page 26: ...TC 20LA5 TC 20LE5 26 ...

Page 27: ...C4124 R914 R1029 R916 R917 R918 R919 R1030 R1031 R1032 R1034 R1035 R921 R1036 R922 R1037 R923 R1038 C4134 R924 R1039 C4135 C2001 R4302 C2002 C4137 R4303 C2003 R927 C4138 R928 C2004 C1065 R929 C1066 C2006 C1067 R1040 C2008 R1041 JK3001 C2009 JK3002 Q2006 R1043 JK3003 Q2007 R1044 JK3004 R930 R1045 C4141 JK3005 Q2009 C4142 R1046 R1047 R1048 C4144 C2010 R1049 C4145 C2011 C2013 L4004 C2014 Q2010 L4005 ...

Page 28: ... 2 Q909 B 3 Q1001 E 4 Q1002 D 4 Q1003 D 4 Q1004 D 5 Q1005 C 5 Q1007 E 4 Q1008 E 5 Q1009 D 5 Q1010 D 5 Q1011 D 4 Q1012 E 5 Q1013 E 5 Q1014 D 4 Q1015 D 5 Q1017 E 5 Q2002 A 3 Q2003 A 4 Q2004 B 3 Q2005 B 2 Q2008 B 3 Q3001 G 2 Q3002 D 2 Q3003 D 3 Q3004 D 3 Q3006 H 3 Q3007 D 3 Q3008 G 2 Q3009 D 3 Q3010 D 2 Q3011 E 3 Q4014 G 1 Q4015 G 1 Q4016 G 1 Q4019 H 3 Q4020 H 2 Q4021 H 2 Q4024 A 4 Q4025 C 4 Q4027 C ...

Page 29: ...0 R904 R1019 R905 IC1011 C1042 IC1012 C4116 R906 C1043 IC1013 C1044 C4118 C1045 C4119 C1047 R1020 ZA4010 R1021 C1049 ZA4011 R1022 R1023 C4120 R910 C4121 R911 R1026 R912 C4123 C4127 C4128 C1055 C4129 C1058 C1059 TP002 R1033 C4132 C4133 R925 R4301 C1061 C4136 C1062 R926 C1063 C4139 Q2002 C2006 Q2003 Q2004 JK3001 R4115 Q2005 JK3002 R4116 JK3003 R4117 R4118 JK3004 C4140 Q2008 R4119 JK3005 C4143 R933 C...

Page 30: ...R NO C001 C002 C004 C005 C006 C008 C009 C026 C027 TA1 TA2 TU001 C2200 C2201 C2202 C2203 C2204 C2205 C2206 C2207 C2208 C2209 C2210 C2211 C2212 C2213 C2215 R2200 R2201 R2202 R2203 R2204 R2205 R2206 IC2201 Q001 L001 R001 R002 R004 R006 R007 R009 R010 R016 TNPA3589 1 TA PbF 1 9 1 9 SEE REVERSE FOR ORDER NO SDA SIF OUT B BT IFOUT SCL BTL VIDEO AGCCONT RF AGF AFT AGCADJ AUDIO 1 12 13 24 R BOARD FOIL SID...

Page 31: ...12 Exploded View and Replacement Parts List 12 1 Exploded View 31 TC 20LA5 TC 20LE5 ...

Page 32: ...12 2 Packing Exploded View 32 TC 20LA5 TC 20LE5 ...

Page 33: ...TMME190 CLAMPER 1 TC 20LA5 20 TMME237 CABLE CLAMPER 1 21 TPCB63104 PACKING CASE 1 TC 20LA5 21 TPCB80501 PACKING CASE 1 TC 20LE5 22 TPD2AA02301 CUSHION TOP 1 23 TPD2AA02401 CUSHION BOTTOM 1 TC 20LA5 23 TPD2AA02501 CUSHION BOTTOM 1 TC 20LE5 24 TPEH211 PROTECT COVER 1 25 TQBC2001 INSTRUCTION BOOK FRENCH 1 TC 20LA5 25 TQBC2002 INSTRUCTION BOOK ENG SPA 1 26 TTUA1144 REAR COVER 1 TC 20LA5 26 TTUA1145 RE...

Page 34: ...13 Electrical Parts List 13 1 Electrical Parts List Notes 34 TC 20LA5 TC 20LE5 ...

Page 35: ...PF J 50V 1 C1028 ECJ1XF1C104Z C 0 1UF Z 16V 1 C1029 EEEHP0J470P C 47PF J 6 3V 1 C1030 ECJ1VF1A105Z C 1UF Z 10V 1 C1031 ECJ1XF1C104Z C 0 1UF Z 16V 1 C1032 ECJ1XC1H101J C 100PF J 50V 1 Ref No Part No Part Name Description Pcs Remarks C1039 ECJ1XF1C104Z C 0 1UF Z 16V 1 C1040 4 1 ECJ1VF1A105Z C 1UF Z 10V 2 C1042 4 3 EEEHB1C100R C 10PF J 16V 2 C1046 ECJ1VF1H103Z C 0 01UF Z 50V 1 C1047 EEEHB1C100R C 10P...

Page 36: ...1C104K C 0 1UF K 16V 3 C4186 8 7 ECJ1VB1C104K C 0 1UF K 16V 2 C4190 ECJ1VB0J105K C 1UF K 16V 1 C4191 ECJ1VB1H103K C 0 01UF K 50V 1 C4193 ECJ1VB0J105K C 1UF K 16V 1 C4194 02 ECJ1VB1C104K C 0 1UF K 16V 9 Ref No Part No Part Name Description Pcs Remarks C4203 ECJ1VB0J105K C 1UF K 16V 1 C4204 ECJ1XC1H471J C 470PF J 50V 1 C4205 ECJ1VB1H103K C 0 01UF K 50V 1 C4206 0 7 ECJ1VB0J105K C 1UF K 16V 2 C4208 EC...

Page 37: ...RANSISTOR 2 Q4035 B1DHDC000021 TRANSISTOR 1 Q4036 UN5211 TRANSISTOR 1 R001 ERJ6GEYJ220 M 22 OHM J 1 10W 1 R1 TJS1A8090 PHONO PIN 3P 1 R002 ERJ6GEYJ220 M 22 OHM J 1 10W 1 R004 ERJ6GEY0R00 M 0 OHM 1 10W 1 R007 ERJ6GEYJ101 M 100 OHM J 1 10W 1 R009 10 ERJ6GEYJ471 M 470 OHM J 1 10W 2 R016 ERJ6GEYJ222 M 2 2KOHM J 1 10W 1 R052 ERJ3GEY0R00 M 0 OHM 1 16W 1 R055 ERJ8GEY0R00 M 0 OHM 1 8W 1 R057 58 ERJ3GEY0R0...

Page 38: ... 1 R2005 ERJ3GEYJ103 M 10KOHM J 1 16W 1 R2006 ERJ3GEYJ104 M 100KOHM J 1 16W 1 Ref No Part No Part Name Description Pcs Remarks R2008 ERJ3GEYJ222 M 2 2KOHM J 1 16W 1 R2009 ERJ3GEYJ104 M 100KOHM J 1 16W 1 R2010 ERJ3GEYJ105 M 1MOHM J 1 16W 1 R2011 ERJ3GEYJ102 M 1KOHM J 1 16W 1 R2012 ERJ12YJ560 M 56 OHM J 1 2W 1 R2013 1 4 ERJ12YJ1R5U M 1 5OHM J 1 2W 2 R2015 ERJ12YJ560 M 56 OHM J 1 2W 1 R2019 ERJ12YJ1R...

Page 39: ...13 D1HG5608A002 NETWORK RESISTER 1 R4215 1 6 ERJ3GEY0R00 M 0 OHM 1 16W 2 R4218 ERJ3GEYJ471 M 470 OHM J 1 16W 1 R4219 ERJ3GEYJ222 M 2 2KOHM J 1 16W 1 Ref No Part No Part Name Description Pcs Remarks R4220 2 1 ERJ3GEYJ220 M 22 OHM J 1 16W 2 R4222 ERJ3GEYJ820 M 82 OHM J 1 16W 1 R4223 2 4 D1HG5608A002 NETWORK RESISTER 2 R4225 2 6 ERJ3GEY0R00 M 0 OHM 1 16W 2 R4227 ERJ3GEYJ331 M 330 OHM J 1 16W 1 R4228 ...

Page 40: ...Ref No Part No Part Name Description Pcs Remarks ZA4010 K9ZZ00000424 CONNECTOR 1 40 TC 20LA5 TC 20LE5 ...

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