Panasonic TX-20LA5F Service Manual

Glp2n chassis
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Service Manual

SPECIFICATIONS

Power Source:
220-240V AC, 50/60Hz
Power Consumption:
74W
Stand-by Power
Consumption:
0,9W
Aerial Impedance:
75Ω unbalanced, Coaxial Type
Receiving System:
PAL-I, B/G, D/K,
SECAM B/G, D/K, L/L'
PAL-525/60 (AV only)
M.NTSC (AV only)
NTSC (AV only)
Receiving Channels:
VHF E2-E12
VHF A-H (ITALY)
VHF H1-H2 (ITALY)
UHF E21-E69
VHF R1-R2
VHF R6-R12
VHF R3-R5
CATV (S01-S05)
CATV S1-S10
CATV S11-S20 (U1-U10)
CATV S21-S41 (Hyperband)
Operating Conditions:
5°C ÷ 35°C
Temperature:
5% ÷ 90% RH (non-condensing)
Humidity:
Intermediate Frequency:
Video/Audio
Video
38,9MHz, 33,9MHz
Audio
33,4MHz (B/G),33,16MHz (A2)
33,05MHz (NICAM B/G, D/K, L)
32,4MHz (D/K),32,66MHz (CZ STEREO)
40,4MHz (L'), 39,75Mhz (L'NICAM)
Colour
34,47MHz (PAL)
34,5MHz, 34,65MHz (SECAM)
38,3MHz, 38,15MHz (SECAM L')
Terminals:
AV1 IN
Video (21 pin)
Audio (21 pin)
RGB (21 pin)
Colour LCD Television
AV1 OUT
AV2 IN
LCD screen:
Audio Output:
Headphones:
Accessories
supplied :
Dimensions:
Including TV stand
Height:
Width:
Depth:
TV set only
Height:
Width:
Depth:
Net weight:
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
1V p-p 75Ω
500mV rms 10kΩ
0,7V p-p 75Ω
ORDER No. PCZ0506069C2
TX-20LA5F
TX-20LA5P
GLP2N Chassis
Video (21 pin)
1V p-p 75Ω
Audio (21 pin)
500mV rms 1kΩ
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
L5EDD5L00005
640 x 480 VGA, 4:3
Visible Diagonal 508mm
2x3W RMS
4Ω impedance
3,5mm, 8Ω Impedance
Remote Control
2 x R6 (UM3) Batteries
505mm
498mm
260mm
450mm
498mm
93mm
7,5kg

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Table of Contents
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Summary of Contents for Panasonic TX-20LA5F

  • Page 1: Service Manual

    ORDER No. PCZ0506069C2 Service Manual Colour LCD Television TX-20LA5F TX-20LA5P GLP2N Chassis SPECIFICATIONS AV1 OUT Video (21 pin) 1V p-p 75Ω Power Source: 220-240V AC, 50/60Hz Audio (21 pin) 500mV rms 1kΩ Power Consumption: AV2 IN S-Video IN Y: 1V p-p 75Ω...
  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ................................. 2 GENERAL QUIDE LINES..............................2 TOUCH – CURRENT CHECK............................. 2 PREVENTION OF ELECTROSTATIC DISCHARGE (ESD) TO ELECTROSTATICALLY SENSITIVE (ES) DEVICES ... 3 ABOUT LEAD FREE SOLDER (PBF)............................4 SUGGESTED PB FREE SOLDER............................4 SERVICE HINTS ..................................5 SETTING INSPECTION................................
  • Page 3: Safety Precautions

    Measuring network for TOUCH CURRENTS COLD WATER PIPE (EARTH GROUND) =500µF =500Ω 10kΩ APPLIANCES =500Ω 0.022µF EXPOSED METAL PARTS Resistance values in ohms (Ω) Input resistance: ≥ 1MΩ Voltmetr or oscilloscope Input capacitance: ≤ 200pF (r.m.s. or peak reading) Frequency range: 15Hz to 1Mhz and d.c.respectively NOTE –...
  • Page 4: About Lead Free Solder (Pbf)

    ABOUT LEAD FREE SOLDER (PbF) Note: Lead is listed as (Pb) in the periodic table of elements. In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder. The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu). That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.
  • Page 5: Service Hints

    SERVICE HINTS HOW TO REMOVE THE BACK COVER Lay the main unit face down as shown in Fig.5. Fig.5 Remove the 4 fixing screws as shown in Fig.6. Remove the stand assembly. SCREWS Fig.6 Remove the 8 fixing screws as shown in Fig.7.
  • Page 6: Setting Inspection

    (-/v) button on the customer controls at the front the TV set. To exit Self Check, switch off the TV set at the power button. O.K. O.K. O.K. AVSW O.K. O.K. O.K. TX-20LA5F TX-20LA5P OPTION 1 OPTION 2 OPTION 3 OPTION 4 OPTION 5 OPTION 6 OPTION 7...
  • Page 7: Alignment Settings

    Display Ref. No. Description P.C.B. IC1101 EAROM A-Board IC1700 DISPLAY PROCESSOR AND SCALER A-Board IC1500 VIDEOSIGNAL PROCESSOR A-Board AVSW IC1500 AV SWITCH A-Board TNR001 TUNER B-Board IC2000 MULTISTANDART SOUND PROCESSOR A-Board DOLBY PROLOGIC PROCESSOR MPEG1 AUDIO PROCESSOR ALIGNMENT SETTINGS (The figures below are nominal and used for representative purposes only.) Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the remote control and press the down button (-/v) on the customer controls at the front of the TV, this will place the TV into the Service Mode 1.
  • Page 8: Block Diagrams

    JK2350 VIDEO IN VIDEO OUT R IN AV1CVBS G IN TXT CVBS AV1 V OUT B IN TVCVBS R EXT G EXT B EXT AV2 V L IN AV2 Y L OUT AD_656.0 ÷ AD_656.7 AV2 C R IN R OUT SPK L OUT AM IN SPK R OUT...
  • Page 9 SERVICE MAINS IN...
  • Page 10 FBL1 SLOW1...
  • Page 11: Parts Location

    PARTS LOCATION NOTE: The numbers on the exploded view below refer to the exploded view section of the Replacement Parts List.
  • Page 12: Replacement Parts List

    TL431AILPM VOLTAGE REF IC EUR7651010 REMOTE CONTROL IC860 C0DBAMA00015 STEP-UP DC CONVERTER L5EDD5L00006 LCD PANEL IC862 TA48L025FLF 2.5V REGULATOR TBMA148 PANASONIC BADGE IC866 C0DAAGH00003 3.3V SBY REGULATOR TBX0E80900 5-KEY BUTTON IC871 C0DBEZC00010 8V REGULATOR TBXA42902 POWER BUTTON IC881 XC6365D105MR 1.8V REGULATOR...
  • Page 13 Cct Ref Parts Number Description Cct Ref Parts Number Description D867 UDZSTE178.2B DIODE Q1502 BC857B TRANSISTOR D868 UDZSTE178.2B DIODE Q1503 BC857B TRANSISTOR D869 1SS355TE-17 DIODE Q1700 B1DHDC000028 TRANSISTOR D870 1SS355TE-17 DIODE Q1701 BC847B TRANSISTOR D871 1SS355TE-17 DIODE Q1702 BC847B TRANSISTOR D872 USF5G49TE16Q DIODE...
  • Page 14 Cct Ref Parts Number Description Cct Ref Parts Number Description 6K8 Ω X2000 5730007158 CRYSTAL R858 ERJ6ENF6801 S.M.CARB 0.1W 3K9 Ω RESISTORS R859 ERJ6ENF3901 .125W 1K Ω R860 ERJ6GEYJ102 S.M.CARB 0.1W 27K Ω C1101 ERJ3GEYJ273 0.1W 100K Ω R861 ERJ6GEYJ104 S.M.CARB 0.1W 0 Ω...
  • Page 15 Cct Ref Parts Number Description Cct Ref Parts Number Description 100 Ω 10K Ω R1126 ERJ3GEYJ101 0.1W R1215 ERJ3GEYJ103 0.1W 100 Ω 2K2 Ω R1127 ERJ3GEYJ101 0.1W R1220 ERJ3GEYJ222 0.1W 10K Ω 2K2 Ω R1128 ERJ3GEYJ103 0.1W R1228 ERJ3GEYJ222 0.1W 10K Ω...
  • Page 16 Cct Ref Parts Number Description Cct Ref Parts Number Description 0 Ω R1741 ERJ3GEY0R00 0.1W C101 ECJ2VB1H102K S.M.CAP 0 Ω R1742 ERJ3GEY0R00 0.1W C102 ECJ2FB1H104 S.M.CAP 100nF 10K Ω R1745 ERJ3GEYJ103 0.1W C106 ECA1HMR33GB ELECT 0.33µF 10K Ω R1748 ERJ3GEYJ103 0.1W C107 ECA1CM221GB...
  • Page 17 Cct Ref Parts Number Description Cct Ref Parts Number Description C882 EEUFC1E102 ELECT 1000µF C1522 ECJ2FB1H104 S.M.CAP 100nF C883 ECUV1H470JCX S.M. CAP 47pF C1523 ECA1CM100GB ELECT 10µF C884 ECUV1H683ZFX S.M. CAP 68nF C1524 ECJ2FB1H104 S.M.CAP 100nF C885 ECJ1VC1H101J S.M.CAP 100pF C1525 ECJ2FB1H104 S.M.CAP...
  • Page 18 Cct Ref Parts Number Description Cct Ref Parts Number Description C2000 ECJ1VC1H560J S.M.CAP 56pF SW1073 EVQPC105K SWITCH C2003 ECJ1VF1E104 S.M.CAP 100nF SW1074 EVQPC105K SWITCH C2004 ECJ1VF1E104 S.M.CAP 100nF DIFFERENCES FOR MODEL TX--20LA5F C2005 ECJ1VF1E104 S.M.CAP 100nF C2007 ECJ1VC1H470J S.M.CAP 47pF C2008 ECJ2VF1C334Z S.M.CAP...
  • Page 19: Schematic Diagrams

    SCHEMATIC DIAGRAMS FOR MODELS TX-20LA5F, TX-20LA5P (GLP2N 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 25: Conductor Views

    CONDUCTOR VIEWS FOR MODEL TX-20LA5F, TX-20LA5P A-BOARD TNP8EAL30 - top TRAN’S Q200 A1 D866 Q1100 C3 Q201 A2 D867 Q1101 B3 Q202 A2 D868 Q1102 B3 Q251 C2 D869 Q1103 C3 Q254 C2 D871 Q1104 C3 Q864 D5 D872 Q1105 B3...
  • Page 26 A-BOARD TNP8EAL30 - bottom TRAN’S Q1207 B3 Q1208 B3 Q860 Q891 DIODES D870 D873 D877 D883...
  • Page 27 P-BOARD TNP8EPL30 TRAN’S Q801 Q802 Q803 Q804 Q805 Q806 Q851 DIODES D801 D802 D803 D804 D805 D806 D807 D808 D809 D810 D811 D812 D813 D851 D852 D853 D855 IC’S IC801 IC802 IC803 IC850...
  • Page 28 V-BOARD TNP8EVL30 TRAN’S Q1060 Q1061 Q1062 DIODES D1051 D1060 IC’S RM1050 Z-BOARD TNP8EZL30 DIODES D2350...

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Tx-20la5p

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