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Panasonic TH-42LF20U Service Manual
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Panasonic TH-42LF20U Service Manual

Full hd lcd display
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TABLE OF CONTENTS

1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 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
8.2. Preparations -----------------------------------------------17
All manuals and user guides at all-guides.com
PAGE
FULL HD LCD Display
TH-42LF20U
Model No.
TH-47LF20U
Model No.
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 --------------------------------------------------- 25
9.1. Block (1 of 2) Diagram ---------------------------------- 25
© Panasonic Corporation 2010
Unauthorized copying and distribution is a violation
of law.
Order Number MTNC100773CE
PAGE

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Summary of Contents for Panasonic TH-42LF20U

  • Page 1: Table Of Contents

    8 Disassembly and Assembly Instructions ---------------16 8.17. Cabinet back replacement ----------------------------- 23 8.1. Flowchart for disassembly------------------------------16 9 Block Diagram --------------------------------------------------- 25 8.2. Preparations -----------------------------------------------17 9.1. Block (1 of 2) Diagram ---------------------------------- 25 © Panasonic Corporation 2010 Unauthorized copying and distribution is a violation of law.
  • Page 2 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 9.2. Block (2 of 2) Diagram ---------------------------------- 26 10 Wiring Connection Diagram --------------------------------- 27 10.1. Wiring Connection Diagram (1)----------------------- 27 10.2. Wiring Connection Diagram (2)----------------------- 29 10.3. Wiring Connection Diagram (3)----------------------- 30 10.4.

  • Page 3: Safety Precautions

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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.

  • Page 5: About Lead Free Solder (Pbf)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 3 Service Navigation 3.1. Applicable signals...
  • Page 7 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U...

  • Page 8: Specifications

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 4 Specifications Power Source 110 - 127 V AC, 50/60Hz Power Consumption Rated Power Consumption 250 W (42 inch) 300 W (47 inch) On mode Average 200 W (42 inch) 255 W (47 inch) Power Consumption* Stand-by condition...

  • Page 9: Operating Instructions

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 5 Operating Instructions...
  • Page 10 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U...

  • Page 11: Service Mode

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 6 Service Mode 6.1. Service Menu Function (1)

  • Page 12: Service Menu Function (2)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 6.2. Service Menu Function (2)

  • Page 13: Service Mode Function (1)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 6.3. Service Mode Function (1)

  • Page 14: Service Mode Function (2)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 6.4. Service Mode Function (2)

  • Page 15: Troubleshooting Guide

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 7 Troubleshooting Guide...

  • Page 16: Disassembly And Assembly Instructions

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 8 Disassembly and Assembly Instructions 8.1. Flowchart for disassembly...

  • Page 17: Preparations

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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.

  • Page 20: Cabinet Back Removal (42 Type)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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.

  • Page 21: Connector Board Removal

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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.

  • Page 22: Replacement Method For Rc+Led Board

    The gasket is affixed to the shield RC. When replacing, also replace the gasket. 3. Affix the Panasonic badge and label to the replacement cabinet front before hand. 4. The spacer sheet and the gasket are affixed to the fittings that hold down the RC+LED board.

  • Page 23: Cabinet Back Replacement

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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. •...
  • Page 24 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 4. (42 type only) Remove the screws shown in the illustra- with replacement tape. The circle mark in the picture tion, and then remove the Power board holder fitting. below shows where to affix the tape. (Adehesive cloth (SCR S-TPG BRZ+FLG 3.0X8.0 V) tape) Caution...

  • Page 25: Block Diagram

    All manuals and user guides at all-guides.com TH-42LF20U / TH-47LF20U Block Diagram 9.1. Block (1 of 2) Diagram COLD POWER BOARD KIV1 MAIN BOARD D650 3.3V_I/O KLVP 24VP Q4001 LCD PANEL PWM1 DCR_VBR 412V DCR_IN Q602 24VP 400/3A OPC_EN OPC_EN...

  • Page 26: Block (2 Of 2) Diagram

    All manuals and user guides at all-guides.com TH-42LF20U / TH-47LF20U 9.2. Block (2 of 2) Diagram SP-R SP-L DDR SDRAM 5VSTB MCU_5V IC2005 MAIN BOARD IC5500 IC2008 IC5501 KSPR KSPL RXD0 TXD1 IC2007 Q7206 Main Chip MCU_5V 12V_PWR IC7200 IC2006...

  • Page 27: Wiring Connection Diagram

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 10 Wiring Connection Diagram 10.1. Wiring Connection Diagram (1)
  • Page 28 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U...

  • Page 29: Wiring Connection Diagram (2)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 10.2. Wiring Connection Diagram (2)

  • Page 30: Wiring Connection Diagram (3)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 10.3. Wiring Connection Diagram (3)

  • Page 31: Wiring Connection Diagram (4)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 10.4. Wiring Connection Diagram (4)

  • Page 32: Exploded View And Replacement Parts List

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 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 33 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.2. Cabinet front (2)
  • Page 34 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.3. Lid back...
  • Page 35 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.4. Cabinet back (42”)
  • Page 36 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.5. Cabinet back (47”)
  • Page 37 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.6. Inside of Cabinet back...
  • Page 38 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.7. Screws for board (42”)
  • Page 39 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.8. Screws for board (47”)
  • Page 40 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.9. Screws for board holder (42”)
  • Page 41 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.10. Screws for board holder (47”)
  • Page 42 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.11. Gasket around the AC inlet and Main board...
  • Page 43 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.12. Wire, Panel mounting bracket...
  • Page 44 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.13. Packing, Accessories (42”)
  • Page 45 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.14. Packing, Accessories (47”)
  • Page 46 All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.1.1.15. Packing, Accessories...

  • Page 47: Mechanical Replacement Parts List (42 Inch)

    T6103520490 CABLE (K38H- PAVCA Description JK39H) T6103504117 CABINET FRONT- PAVCA T6103511528 CABLE (K72E- PAVCA N9AB K10E) TBMA162 PANASONIC BADGE T9103216158 CABLE (K16C- PAVCA TXFKP12XSER SPACER SHEET- PAVCA K6C) N9AB T6103511498 CABLE (K72D- PAVCA TXFKP16XSER MTG C/F & C/B PAVCA K10D)

  • Page 48: Mechanical Replacement Parts List (47 Inch)

    T6103520490 CABLE (K38H- PAVCA Description JK39H) T6103504100 CABINET FRONT- PAVCA T6103511528 CABLE (K72E- PAVCA N9BB K10E) TBMA162 PANASONIC BADGE T9103216158 CABLE (K16C- PAVCA TXFKP12XSER SPACER SHEET- PAVCA K6C) N9AB T6103511498 CABLE (K72D- PAVCA TXFKP14XSER MTG C/F & C/B PAVCA K10D)

  • Page 49: Electrical Replacement Boards List (42 Inch)

    All manuals and user guides at all-guides.com TC-42LF20U / TC-47LF20U 11.4. Electrical Replacement Boards list (42 inch) Note: All boards are Non serviceable. Safety Ref. Part No. Part Name & Remarks Description T6103500829 ASSY, PWB, PAVCA RC+LED N9AA T6103500836 ASSY, PWB, KEY PAVCA SW N9AA T6103499710 ASSY, PWB,...

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