Panasonic TH-42LF20U Service Manual
  1. Manuals
  2. Brands
  3. Panasonic Manuals
  4. Monitor
  5. TH42LF20U - 42" HD LCD TV
  6. Service manual
Panasonic TH-42LF20U Service Manual

Panasonic TH-42LF20U Service Manual

Hide thumbs Also See for TH-42LF20U:
Table of Contents

Advertisement

Quick Links

Download this manual

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
Model No.
Model No.
PAGE
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
FULL HD LCD Display
TH-42LF20U
TH-47LF20U
PAGE

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the TH-42LF20U and is the answer not in the manual?

Questions and answers

Related Manuals for Panasonic TH-42LF20U

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 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. Wiring Connection Diagram (4)----------------------- 31 11 Exploded View and Replacement Parts List ----------- 32 11.1.

  • Page 3: Safety Precautions

    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

    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. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip”...

  • Page 5: About Lead Free Solder (Pbf)

    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). That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.

  • Page 6: Service Navigation

    TC-42LF20U / TC-47LF20U 3 Service Navigation 3.1. Applicable signals...
  • Page 7 TC-42LF20U / TC-47LF20U...

  • Page 8: Specifications

    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 0.1 W (42 inch) 0.1 W (47 inch) LCD Display panel...

  • Page 9: Operating Instructions

    TC-42LF20U / TC-47LF20U 5 Operating Instructions...
  • Page 10 TC-42LF20U / TC-47LF20U...

  • Page 11: Service Mode

    TC-42LF20U / TC-47LF20U 6 Service Mode 6.1. Service Menu Function (1)

  • Page 12: Service Menu Function (2)

    TC-42LF20U / TC-47LF20U 6.2. Service Menu Function (2)

  • Page 13: Service Mode Function (1)

    TC-42LF20U / TC-47LF20U 6.3. Service Mode Function (1)

  • Page 14: Service Mode Function (2)

    TC-42LF20U / TC-47LF20U 6.4. Service Mode Function (2)

  • Page 15: Troubleshooting Guide

    TC-42LF20U / TC-47LF20U 7 Troubleshooting Guide...

  • Page 16: Disassembly And Assembly Instructions

    TC-42LF20U / TC-47LF20U 8 Disassembly and Assembly Instructions 8.1. Flowchart for disassembly...

  • Page 17: Preparations

    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. the rear cover.

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

    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

    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. the Power board. Couplers on the Power board: K601, KIV2, KIV1, K6C, 2.

  • Page 20: Cabinet Back Removal (42 Type)

    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. Remove the following board couplers. that screw into the cabinet back's periphery impact the out- Jack board: K39H ward appearance.

  • Page 21: Connector Board Removal

    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. 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 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

    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. • The parts that are necessary for replacement (DEC button, DEC AV, etc.) are not included.
  • Page 24 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

    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 PEL-TEST T6011 MAIN CHIP Q604 IC633 Q604 3.3V_I/O...

  • Page 26: Block (2 Of 2) Diagram

    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 KSPR KSPL IC5501 RXD0 TXD1 IC2007 Q7206 Main Chip MCU_5V 12V_PWR IC7200 IC2006 UART-SW TXD0 RXD1 IC2009 AV1_Y 3.3VSTB MUTE...

  • Page 27: Wiring Connection Diagram

    TC-42LF20U / TC-47LF20U 10 Wiring Connection Diagram 10.1. Wiring Connection Diagram (1)
  • Page 28 TC-42LF20U / TC-47LF20U...

  • Page 29: Wiring Connection Diagram (2)

    TC-42LF20U / TC-47LF20U 10.2. Wiring Connection Diagram (2)

  • Page 30: Wiring Connection Diagram (3)

    TC-42LF20U / TC-47LF20U 10.3. Wiring Connection Diagram (3)

  • Page 31: Wiring Connection Diagram (4)

    TC-42LF20U / TC-47LF20U 10.4. Wiring Connection Diagram (4)

  • Page 32: Exploded View And Replacement Parts List

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

    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, PAVCA POWER N9AA T6103514697 ASSY, PWB, MAIN...

This manual is also suitable for:

Th-47lf20u

Table of Contents