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Panasonic TX-20LB5F/G Service Manual
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Panasonic TX-20LB5F/G Service Manual

Sl-120pp chassis
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Service Manual
Power Source
AC 100-240V, 50/60Hz TV set DC 15V, 4.67A Max.
Power Consumption
Average use: 50W
Standby condition: 2.5W
LCD
VGA (640 × 480 pixels)
4:3 aspect ratio LCD panel
Screen Size
408 mm(W) × 306 mm(H)
Sound
Speaker
9 cm × 5cm, 2pcs, 4Ω
Audio Output
4W (2W + 2W), 20% THD
Headphones
M3 (3.5 mm) Jack x 1
Receiving Systems/ Band name
VHF BAND I: CH2-CH4
BAND II: CH5-CH12
UHF HYPER BAND :SI'-S3', S1-S20
BAND IV, V : CH21-CH68
PAL-B/G, D/K, SECAM-L/L', NTSC(AV input only)
Aerial-Rear
UHF/VHF
TX-20LB5F/G
TX-20LB5P/G
SL-120PP Chassis
Operating Conditions
Temperature: -10°C ~ 40°C
Humidity: 0% ~ 90% RH (non-condensing)
Connection Terminals
AV1 (Scart connecter)
21 Pin terminal (Audio/Video in, Audio/Video out,
RGB in)
AV2
VIDEO
RCA PIN Type × 1
S-VIDEO
Mini DIN 4-pin
AUDIO L-R
RCA PIN Type × 2
Dimensions (W x H x D)
Including TV Stand
608mm(W) × 215mm(D) × 457.5mm(H)
TV Set Only
608mm(W) × 73,7mm(D) × 403mm(H)
Weight
10.1kg Net
Note:
Design and Specifications are subject to change without
notice.
Weight and Dimensions shown are approximate.
© 2006 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
ORDER NO. PCZ0602001CE
LCD TV

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Summary of Contents for Panasonic TX-20LB5F/G

  • Page 1 ORDER NO. PCZ0602001CE Service Manual LCD TV TX-20LB5F/G TX-20LB5P/G SL-120PP Chassis Operating Conditions Power Source Temperature: -10°C ~ 40°C AC 100-240V, 50/60Hz TV set DC 15V, 4.67A Max. Humidity: 0% ~ 90% RH (non-condensing) Power Consumption Connection Terminals Average use: 50W Standby condition: 2.5W...

  • Page 2: Table Of Contents

    TX-20LB5F/G TX-20LB5P/G CONTENTS Page Page 1. Safety Precautions ----------------------------------------------- 3 8 Service Mode Function ----------------------------------------13 1.1. General Guidelines -------------------------------------- 3 8.1. How to enter SERVICE 1 ------------------------------13 1.2. Touch-Current Check ------------------------------------ 3 8.2. How to enter SERVICE 2 ------------------------------13 2. Prevention of Electro Static Discharge (ESD) to 8.3.

  • Page 3: Safety Precautions

    TX-20LB5F/G TX-20LB5P/G 1 Safety Precautions 1.1. General Guidelines 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

  • Page 4: Prevention Of Electro Static Discharge (Esd) To Electrostatically Sensitive (Es) Devices

    TX-20LB5F/G TX-20LB5P/G 2 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 devices are integrated circuits and some field-effect transistors and semiconductor „chip”...

  • Page 5: About Lead Free Solder (Pbf)

    TX-20LB5F/G TX-20LB5P/G 3 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).

  • Page 6: Self Check

    TX-20LB5F/G TX-20LB5P/G 4 Self Check 1. Self-Check is used to automatically check the bus lines and hexadecimal code of the TV set. 2. To get into the Self -Check mode press the Down ( ) button on the TV set, at the same time pressing the Recall ( button on the remote control, and the screen will show when the self Check is finished:...

  • Page 7: Chasis Board Layout

    TX-20LB5F/G TX-20LB5P/G 5. Chassis Board Layout TTL ASSY INVERTER AV ASSY MAIN ASSY LED ASSY CTRL ASSY Board Name Function MAIN ASSY Main Board CTRL ASSY Power Switch, Select Switch AV ASSY AV, Headphone LED ASSY Remote Receiver, LED, Speaker(R) connection...

  • Page 8: Before Servicing

    TX-20LB5F/G TX-20LB5P/G 6. Before servicing 6.1. Wire dressing Check a wire dressing is same as illustrated below; 4850712S01 4859004560 P502-INVERTER Coupler Wire P902-LCD PANEL FFC Cable 4850703S50 P601-Speaker(L) Coupler Wire 4850712N12 PA09-PA09A Coupler Wire P601 P902 P502 PA09A P504 PA09...

  • Page 9: Disassembly For Service

    TX-20LB5F/G TX-20LB5P/G 7. Disassembly for service 7.2. Back cover 1. Remove stand ass’y (see 7.1.) 2. Remove the fixing screws (4pcs 7.1 Stand Ass’y 1. Lay down the main unit so that the back cover faces 3. Remove the Back cover as pushing clips as illustrated upward.

  • Page 10: Ctrl Ass

    TX-20LB5F/G TX-20LB5P/G 7.3. CTRL Ass’y 7.4. LED Ass’y 1. Remove the back cover (see. 7.2.) 1. Remove the back cover (see. 7.2.) 2. Remove the fixing screw (1pcs 2. Remove the tapes (2pcs 3. Remove the CTRL Ass’y with cable 3.

  • Page 11: Av Ass

    TX-20LB5F/G TX-20LB5P/G 7.5. AV Ass’y 7.6. INVERTER 1. Remove the back cover (see. 7.2.) 1. Remove the back cover (see. 7.2.) 2. Remove tie cable(1pcs ) and unlock the clamp wire 2. Disconnect the coupler(connector P502A) (1pcs ) to free the cable.

  • Page 12: Main Ass

    TX-20LB5F/G TX-20LB5P/G 7.9. Main Ass’y 7.10. Panel LCD 1. Remove the back cover (see. 7.2.) 1. Remove the back cover (see. 7.2.) 2. Remove the LED Ass’y, CTRL Ass’y 2. Remove the TTL Ass’y (see 7.7.) (see 7.3., 7.4.) 3. Disconnect the backlight interface connectors which 3.

  • Page 13: Service Mode Function

    TX-20LB5F/G TX-20LB5P/G 8. Service Mode Function MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can be adjusted by remote control in Service Mode. 8.1. How to enter SERVICE Simultaneously press MUTE button ( ) on remote control and program DOWN button ( ) on the TV set.

  • Page 14: Option Description

    TX-20LB5F/G TX-20LB5P/G 8.3. Option Description There are two option bytes available (16 bits in all). These option bits are available from FACTORY and SERVICE mode. First find the OPTION1 or OPTION2 control, and then use the UP/DOWN and PLUS/MINUS keys on the relevant remote keypad to control the bits.
  • Page 15 TX-20LB5F/G TX-20LB5P/G...

  • Page 16: Conduct Views

    TX-20LB5F/G TX-20LB5P/G 9. Conduct Views 9.1. FOIL SIDE...
  • Page 17 TX-20LB5F/G TX-20LB5P/G...

  • Page 18: Component Side

    TX-20LB5F/G TX-20LB5P/G 9.2. COMPONENT SIDE Part Location TRANSISTOR CRYSTAL QUARTZ I402 Q120 X201 I403 Q506 X501 I501 D3,E3 Q508 I502 Q602 I503 D4,F4 Q701 I504 Q702 I508 Q802 I601 G5,H5 Q803 I603 Q804 I801 Q805 I802 Q813 I803 Q814 FILTER SAW...
  • Page 19 TX-20LB5F/G TX-20LB5P/G...

  • Page 20: Block And Schematic Diagrams

    TX-20LB5F/G TX-20LB5P/G 10. Block and Schematic Diagrams 10.1. Schematic Diagram Notes...

  • Page 21: Block Diagram

    TX-20LB5F/G TX-20LB5P/G 10.2. Block Diagram...

  • Page 22: Schematic Diagram

    TX-20LB5F/G TX-20LB5P/G 10.3. Schematic Diagram...
  • Page 23 TX-20LB5F/G TX-20LB5P/G...
  • Page 24 TX-20LB5F/G TX-20LB5P/G...
  • Page 25 TX-20LB5F/G TX-20LB5P/G...
  • Page 26 TX-20LB5F/G TX-20LB5P/G...
  • Page 27 TX-20LB5F/G TX-20LB5P/G...

  • Page 28: Parts Location & Replacement Parts List

    TX-20LB5P/G 11 Parts Location & Replacement Parts List 11.1. Different parts List Ref. Part No. Part Name & Description Q’ty Remark DIFFERENCES FOR MODEL TX-20LB5F/G Part Location View 4855421600 S/PLATE TX-20LB5F/G (WEST) see „Note” TQB0E0289 MANUAL GERMAN, DUTCH, ITALIAN, FRENCH, SPANISH 1...

  • Page 29: Exploded View

    TX-20LB5F/G TX-20LB5P/G 11.2. Exploded View 9 10 15 14 18 19 Ref. Part No. Part Name & Description Q’ty Remark 4855624700 MARK BRAND PANA LCD 17INCH 4852088414 MASK FRONT 20D6 FR HIPS GY (HALOGEN FREE) 4857743900 CUSION PANEL PVC 300 X 10 T=1.0 PVC 400 X 10 T=1.0...

  • Page 30: Stand Assy Exploded View

    TX-20LB5F/G TX-20LB5P/G 11.3. Stand Assy Exploded View < STEP 4 > < STEP 1 > < STEP 2 > < STEP 5 > < STEP 3 > < STEP 6 > Ref. Part No. Part Name & Description Q’ty Remark...

  • Page 31: Packing Exploded Views

    TX-20LB5F/G TX-20LB5P/G 11.4. Packing Exploded Views Ref. Part No. Part Name & Description Q’ty Remark Stand Assy DMP5012200 PANASONIC TX-20LB5 485819AT01DN PAD DOWN EPS 20D4 4858215701 BAG P.E. 1000X950 (U.K) LAMINATED DMP5012300 BOX ACCESSORY DLP-20D4LHS 4858213801 BAG INSTRUCTION L. D. P. E. T0. 05X250X400...

  • Page 32: Electrical Replacement Parts List

    TX-20LB5F/G TX-20LB5P/G 11.5. Electrical Replacement Parts List Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark C272 HCQK220JBA C CHIP CERA 50V CH 22PF J 1608 P501 4850708S02 CONNECTOR...
  • Page 33 TX-20LB5F/G TX-20LB5P/G Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark C560 HCBH224KBA C CHIP CERA 25V X7R 0.22MF K 1608 C706 CEXF1C101A C ELECTRO 16V RSM 100MF (6.3X7) TP...
  • Page 34 TX-20LB5F/G TX-20LB5P/G Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark CA32 HCQK270JBA C CHIP CERA 50V CH 27PF J 1608 I811 1A1117EA-D IC CHIP REGULATOR AP1117EA ADJ 2% SOT-223...
  • Page 35 TX-20LB5F/G TX-20LB5P/G Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark LA33 5PXF1B471M FILTER EMI CFI 06 B 1H 470PF R212 HRFT470JBA R CHIP 1/10W 47 OHM J 1608...
  • Page 36 TX-20LB5F/G TX-20LB5P/G Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark R553 HRFT103JBA R CHIP 1/10W 10K OHM J 1608 R644 HRFT479JBA R CHIP 1/10W 4.7 OHM J 1608...
  • Page 37 TX-20LB5F/G TX-20LB5P/G Ref. No. Part No. Part Name & Description Q’ty Remark Ref. No. Part No. Part Name & Description Q’ty Remark R932 HRFT101JBA R CHIP 1/10W 100 OHM J 1608 SW703 5S50101Z90 SW TACT SKHV10910A R933 HRFT101JBA R CHIP...

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