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Panasonic TH-42LF20W Service Manual
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Panasonic TH-42LF20W Service Manual

Panasonic TH-42LF20W Service Manual

Full hd lcd display
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TABLE OF CONTENTS

1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
1.2. Touch-Current Check ------------------------------------- 3
2 Warning -------------------------------------------------------------- 4
2.2. About lead free solder (PbF)---------------------------- 5
3 Service Navigation ----------------------------------------------- 6
3.1. Applicable signals ----------------------------------------- 6
4 Specifications ----------------------------------------------------- 8
5 Operating Instructions------------------------------------------ 9
6 Service Mode -----------------------------------------------------11
6.1. Service Menu Function (1) ----------------------------- 11
6.2. Service Menu Function (2) -----------------------------12
6.3. Service Mode Function (1) -----------------------------13
6.4. Service Mode Function (2) -----------------------------14
7 Troubleshooting Guide ----------------------------------------15
8.1. Flowchart for disassembly------------------------------16
Model No.
Model No.
PAGE
8.2. Preparations----------------------------------------------- 17
8.3. Pedestal (option) removal------------------------------ 17
8.4. Rear cover removal-------------------------------------- 17
board -------------------------------------------------------- 18
8.8. Cabinet back removal (42 type) ---------------------- 20
8.9. Cabinet back removal (47 type) ---------------------- 20
board connected ----------------------------------------- 20
8.12. Key SW board replacement --------------------------- 20
8.13. Connector board removal ------------------------------ 21
8.14. LCD panel replacement -------------------------------- 21
8.16. Cabinet front replacement ----------------------------- 22
8.17. Cabinet back replacement ----------------------------- 23
9 Block Diagram --------------------------------------------------- 27
© Panasonic Corporation 2010
Unauthorized copying and distribution is a violation
of law.
Order Number ITD1009084CE
FULL HD LCD Display
TH-42LF20W
TH-47LF20W
PAGE

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Summary of Contents for Panasonic TH-42LF20W

  • Page 1: Table Of Contents

    8.16. Cabinet front replacement ----------------------------- 22 8 Disassembly and Assembly Instructions ---------------16 8.17. Cabinet back replacement ----------------------------- 23 8.1. Flowchart for disassembly------------------------------16 9 Block Diagram --------------------------------------------------- 27 © Panasonic Corporation 2010 Unauthorized copying and distribution is a violation of law.
  • Page 2 TH-42LF20W / TH-47LF20W 9.1. Block (1 of 2) Diagram ---------------------------------- 27 9.2. Block (2 of 2) Diagram ---------------------------------- 28 10 Wiring Connection Diagram --------------------------------- 29 10.1. Wiring Connection Diagram (1)----------------------- 29 10.2. Wiring Connection Diagram (2)----------------------- 31 10.3. Wiring Connection Diagram (3)----------------------- 32 10.4.

  • Page 3: Safety Precautions

    TH-42LF20W / TH-47LF20W 1 Safety Precautions 1.1. General Guidelines 1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials. 2. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the wires have been broken or disconnected, do not attempt to repair or re-wire the units.

  • Page 4: Warning

    TH-42LF20W / TH-47LF20W 2 Warning 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensi- tive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec- trostatically 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)

    TH-42LF20W / TH-47LF20W 2.2. 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: Service Navigation

    TH-42LF20W / TH-47LF20W 3 Service Navigation 3.1. Applicable signals...
  • Page 7 TH-42LF20W / TH-47LF20W...

  • Page 8: Specifications

    TH-42LF20W / TH-47LF20W 4 Specifications Power Source 220 - 240 V AC, 50/60Hz Power Consumption Power on 240 W (42 inch) 290 W (47 inch) Stand-by condition 0.2 W (42 inch) 0.2 W (47 inch) Power off condition 0.2 W (42 inch) 0.2 W (47 inch)

  • Page 9: Operating Instructions

    TH-42LF20W / TH-47LF20W 5 Operating Instructions...
  • Page 10 TH-42LF20W / TH-47LF20W...

  • Page 11: Service Mode

    TH-42LF20W / TH-47LF20W 6 Service Mode 6.1. Service Menu Function (1)

  • Page 12: Service Menu Function (2)

    TH-42LF20W / TH-47LF20W 6.2. Service Menu Function (2)

  • Page 13: Service Mode Function (1)

    TH-42LF20W / TH-47LF20W 6.3. Service Mode Function (1)

  • Page 14: Service Mode Function (2)

    TH-42LF20W / TH-47LF20W 6.4. Service Mode Function (2)

  • Page 15: Troubleshooting Guide

    TH-42LF20W / TH-47LF20W 7 Troubleshooting Guide...

  • Page 16: Disassembly And Assembly Instructions

    TH-42LF20W / TH-47LF20W 8 Disassembly and Assembly Instructions 8.1. Flowchart for disassembly...

  • Page 17: Preparations

    TH-42LF20W / TH-47LF20W 8.2. Preparations 8.4. Rear cover removal To avoid damaging the LCD panel, lay out a soft cloth or towel First remove the 10 screws on the rear cover, and then remove and lay down the unit so the front side is facing down.

  • Page 18: Replacement Method For Main Board And Jack Board

    TH-42LF20W / TH-47LF20W 8.5. Replacement method for main board and jack board 1. The terminal section is screwed in from the outside, so remove the screws as shown in the illustration. 2. Remove 1 screw on the jack board that screws in the earth terminal which comes off from the left side of the main board.

  • Page 19: Replacement Method For Power Board

    TH-42LF20W / TH-47LF20W 8.6. Replacement method for 8.7. Replacement method for AC Power board cord bracket 1. Remove the couplers that are connected to the Power 1. Remove the K601 connector for the AC cord bracket from board. the Power board.

  • Page 20: Cabinet Back Removal (42 Type)

    TH-42LF20W / TH-47LF20W 8.8. Cabinet back removal (42 type) 8.10. When removing the cabinet back with the board connected Precautions when removing and installing • Be careful not to strip the screw's thread, etc., as the screws 1. Remove the following board couplers.

  • Page 21: Connector Board Removal

    TH-42LF20W / TH-47LF20W 8.13. Connector board removal 3. While widening the mounting that connects the cabinet front and the LCD panel, remove the cabinet front from 1. Peel off the tape halfway that affixes the FFC cable and the LCD panel. When lifting up the LCD panel, hold the lead wire for the connector board to the rear side of the mounting component.

  • Page 22: Replacement Method For Rc+Led Board

    • The parts that are necessary for replacement (spacer sheet, 1. Slide the 2 fittings on the inside of the cabinet front toward Panasonic badge, etc.) are not included. They are supplied the outside and remove. as replacement parts. Replace them at the same time as the 2.

  • Page 23: Cabinet Back Replacement

    TH-42LF20W / TH-47LF20W 8.17. Cabinet back replacement 4. Install the RC+LED board onto the cabinet front. 5. Slide the mounting on and install it onto the cabinet front. Precautions when replacing 6. Affix the spacer sheet onto the mounting. • The parts that are necessary for replacement (DEC button, DEC AV, etc.) are not included.
  • Page 24 TH-42LF20W / TH-47LF20W 4. (42 type only) Remove the screws shown in the illustra- tape) tion, and then remove the Power board holder fitting. (SCR S-TPG BRZ+FLG 3.0X8.0 V) Caution • Affix the tape so the lead wire is sealed tightly onto the cabinet back.
  • Page 25 TH-42LF20W / TH-47LF20W When replacing the cabinet back, secure the lead wires for the speaker and main board to the cabinet back with replacement tape.
  • Page 26 TH-42LF20W / TH-47LF20W...

  • Page 27: Block Diagram

    TH-42LF20W / TH-47LF20W Block Diagram 9.1. Block (1 of 2) Diagram COLD POWER BOARD KIV1 MAIN BOARD D650 3.3V_I/O KLVP 24VP LCD PANEL Q4001 DCR_VBR PWM1 412V DCR_IN Q602 24VP 400/3A OPC_EN OPC_EN PEL-TEST T6011 MAIN CHIP Q604 IC633 Q604 3.3V_I/O...

  • Page 28: Block (2 Of 2) Diagram

    TH-42LF20W / TH-47LF20W 9.2. Block (2 of 2) Diagram SP-R SP-L DDR SDRAM 5VSTB MCU_5V IC2005 IC5500 MAIN BOARD IC2008 IC5501 KSPR KSPL RXD0 TXD1 IC2007 Q7206 Main Chip MCU_5V 12V_PWR IC7200 IC2006 UART-SW TXD0 IC2009 RXD1 AV1_Y 3.3VSTB MUTE...

  • Page 29: Wiring Connection Diagram

    TH-42LF20W / TH-47LF20W 10 Wiring Connection Diagram 10.1. Wiring Connection Diagram (1)
  • Page 30 TH-42LF20W / TH-47LF20W...

  • Page 31: Wiring Connection Diagram (2)

    TH-42LF20W / TH-47LF20W 10.2. Wiring Connection Diagram (2)

  • Page 32: Wiring Connection Diagram (3)

    TH-42LF20W / TH-47LF20W 10.3. Wiring Connection Diagram (3)

  • Page 33: Wiring Connection Diagram (4)

    TH-42LF20W / TH-47LF20W 10.4. Wiring Connection Diagram (4)

  • Page 34: Exploded View And Replacement Parts List

    TH-42LF20W / TH-47LF20W 11 Exploded View and Replacement Parts List 11.1. Exploded View and Mechanical Replacement Parts List 11.1.1. Exploded View 11.1.1.1. Cabinet front (1)
  • Page 35 TH-42LF20W / TH-47LF20W 11.1.1.2. Cabinet front (2)
  • Page 36 TH-42LF20W / TH-47LF20W 11.1.1.3. Lid back...
  • Page 37 TH-42LF20W / TH-47LF20W 11.1.1.4. Screws for Cabinet back (42”)
  • Page 38 TH-42LF20W / TH-47LF20W 11.1.1.5. Screws for Cabinet back (47”)
  • Page 39 TH-42LF20W / TH-47LF20W 11.1.1.6. Cabinet back (42”)
  • Page 40 TH-42LF20W / TH-47LF20W 11.1.1.7. Cabinet back (47”)
  • Page 41 TH-42LF20W / TH-47LF20W 11.1.1.8. Inside of Cabinet back...
  • Page 42 TH-42LF20W / TH-47LF20W 11.1.1.9. Screws for board (42”)
  • Page 43 TH-42LF20W / TH-47LF20W 11.1.1.10. Screws for board (47”)
  • Page 44 TH-42LF20W / TH-47LF20W 11.1.1.11. Screws for board holder (42”)
  • Page 45 TH-42LF20W / TH-47LF20W 11.1.1.12. Screws for board holder (47”)
  • Page 46 TH-42LF20W / TH-47LF20W 11.1.1.13. Gasket around the AC inlet and Main board...
  • Page 47 TH-42LF20W / TH-47LF20W 11.1.1.14. Wire, Panel mounting bracket...
  • Page 48 TH-42LF20W / TH-47LF20W 11.1.1.15. Packing, Accessories (42”)
  • Page 49 TH-42LF20W / TH-47LF20W 11.1.1.16. Packing, Accessories (47”)
  • Page 50 TH-42LF20W / TH-47LF20W 11.2. Mechanical Replacement Parts List (42 inch) Safety Ref. Part No. Part Name & Remarks Description Safety Ref. Part No. Part Name & Remarks T6103526478 INST MANUAL Description (RUSSIAN) T6103504117 CABINET FRONT T6103526492 INST MANUAL TBMA162 PANASONIC BADGE...

  • Page 51: Mechanical Replacement Parts List (42 Inch)

    TH-42LF20W / TH-47LF20W 11.3. Mechanical Replacement Parts List (47 inch) Safety Ref. Part No. Part Name & Remarks Description Safety Ref. Part No. Part Name & Remarks TZ6103504209 MTG PANEL TOP L Description TZ6103504216 MTG PANEL TOP R T6103504100 CABINET FRONT...

  • Page 52: Mechanical Replacement Parts List (47 Inch)

    TH-42LF20W / TH-47LF20W 11.4. Electrical Replacement Boards list (42 inch) Note: All boards are Non serviceable. Safety Ref. Part No. Part Name & Remarks Description T6103500829 CIRCUIT BOARD- RC+LED T6103500836 CIRCUIT BOARD- KEY SW T6103499710 CIRCUIT BOARD- POWER T6103528410 CIRCUIT BOARD-...

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Th-47lf20w

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