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Panasonic TH-L42U5D Service Manual
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Panasonic TH-L42U5D Service Manual

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ORDER NO.PAVCI1206036CE
LCD TV
TH-L42U5D
Model No.
©Panasonic Corporation 2012.
Unauthorized copying and distribution is a
violation of law.

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Summary of Contents for Panasonic TH-L42U5D

  • Page 1 ORDER NO.PAVCI1206036CE LCD TV TH-L42U5D Model No. ©Panasonic Corporation 2012. Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    CONTENTS 1. Safety precautions ....................3 2. Alignment instructions and method of software upgrading........5 3. Working principle analysis of the unit ..............15 4. Specifications.......................16 5. Block diagram ......................17 6. Wiring diagram ....................20 7. Troubleshooting guide..................25 8. Exploded View .....................29 9.

  • Page 3: Safety Precautions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
  • Page 4 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling. 2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual.
  • Page 5 2. Alignment instructions (1) Test equipment VG-859 (YPbPr, VGA, HDMI signal generator) CA210 (white balancer) (2) Power test Connect main board, power board and IR board according the wiring diagram, connect the power and press power key (Remote controller or Keypad) button to turn on the TV. a) Test the pin voltage of P802/power board , the data is shown in table1: Table1 voltage data of P802 For 42”...
  • Page 6 (3) Alignment flow-chart The alignment flow-chart is shown as fig-1 Check if DDC, HDCP KEY, FLASH are written Combined test for general assembly White balance adjustment Connect to the center signal source and check each Function of TV (station leaking, analog control, etc.) Check the output of earphone and speaker.
  • Page 7 (4) Adjustment instruction At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode . During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode. 4-1. Source Calibration 4-1.1.
  • Page 8 Entering factory Mode: Press up or down key of remote control to select “Auto Calibration”, Press 「OK」 4-1.2. key to enter the item. -> Source calibration performed automatically, and “OK” info. will pop up after finished. Repeat step 2 to do VGA input sources, Signal Format : VGA 1024x768@60Hz Instrument (Recommend) : Astro VG-859 / timing PG2 963...
  • Page 9 4-2. Color Temperature Adjustment & Check 4-2.1. Set below items 4-2.2. Press up or down key of remote control to select “Cool”, Press 「ENTER」 key to enter the item. RGAIN, GGAIN, BGAIN, ROFFSET, GOFFSET, BOFFSET, drive values are set for Warm, Normal, and Cool independently.
  • Page 10 (5) Items of Factory menu At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode . During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode. Press the up and down key to move high light item from Color Temperature ->...
  • Page 11 6) RF Burn In Use “snow” pattern for burn in. Selected items are “On” and “Off”. While turn on burn in mode, firmware will automatically turn off “Auto power off” function. If there is no power supply suddenly, firmware will re-enter burn in mode automatically when power supplied.
  • Page 12 (6) Performance check 6-1 TV function Connect RF signal, select “auto tuning” to search the channels and mark sure the picture and sound are normally presented after finished. 6-2 AV terminals Input Video signal, make sure the picture and sound are normally presented. 6-3 YPbPr terminal Input YUV signal (VG859 signal generator), listed in table4 and make sure the picture and sound are normally presented.
  • Page 13 6-4 VGA terminal Input VGA signal (VG859 signal generator), listed in table5 and check the display and sound. You can select Menu > Setup > PC setup > Auto Adjust to correct the picture deviation if needed. Table5 VGA signal format SYNC PIXEL SYNC...
  • Page 14 WXGA 60Hz 47.712 1792 Positive 85.5 1360 1360x768 60.015 Positive 59.94Hz 720x480i 15.734 1716 Negative 1440 59.94 525 Negative 59.94Hz 720x480P 31.469 858 Negative 59.94 525 Negative 50Hz 1440x576i 15.625 1716 Negative 1440 525 Negative 50Hz 1440x576P 31.25 858 Negative 525 Negative 60Hz 1280x720P 1650...

  • Page 15: Working Principle Analysis Of The Unit

    Working principle analysis of the unit 1. Tuner signals flow: Antenna signal will be send to tuner SUT-RE216TN, t h e n T u n e r w i l l p r o v i d e t h e L o w I F s i g n a l t o S c a l e r a n d demodulated by it.

  • Page 17: Block Diagram

    SPB42S 42” Block Diagram...
  • Page 18 SPB42S Block Diagram 4-1 Power Block Diagram SPB42S: FSP power board:...
  • Page 20 SPB42S 42-inch Wiring Diagram BLOCK...
  • Page 21 II. Wiring Connection AUO panel Main board to Panel Main board to Speaker SPB42S SPB42S DC02L00270I DC02V03460I 480 mm L:580 & R:955 mm Panel side Main board CN17 Main board CN3 Speaker FI-RE51S-HF LVDS cable A2006WV0-2X40P JWT A2001WV2-4P Color Right 1 NC 1 SPK_OUTR+ P5 Speaker -...
  • Page 22 16 CH1_2- WHITE 23 LVDS_D2O_N 3 LED_R 3 LED_R 17 CH1_2+ GREEN 24 LVDS_D2O_P 4 GND Orange 4 GND 18 GND BLACK 1 GND 5 IRR Green 5 IRR 19 CH1_CLK- WHITE 21 LVDS_CO_N 6 VCC5_0_STB Yellow 6 VCC5_0_STB 20 CH1_CLK+ YELLOW 22 LVDS_CO_P 21 GND...
  • Page 23 41 NC 42 GND BLACK 43 GND BLACK 44 GND BLACK 45 GND BLACK 46 GND BLACK 47 NC 48 Vdd 37 LVDS_PWR 49 Vdd 38 LVDS_PWR 50 Vdd 39 LVDS_PWR 51 Vdd 40 LVDS_PWR...

  • Page 24: Wiring Diagram

    III. Wiring Connection(POWER)
  • Page 25 Trouble shooting 1. Fault clearance Before calling your dealer or service center for assistance, check the matters below once again. (1) Make sure you have connected LCD TV to your equipment as described in the section “ CONNECTING LCD TV”. (2) Check cable connection.

  • Page 26: Troubleshooting Guide

    2. Troubleshooting guide The flow chart shown below will help you to troubleshoot your Televison set with it doesn’t display normally. Each procedure offers a simple way to check for system errors. Before starting, ensure that there is a signal in and that the Televison is turned on. 2-1 Power LED no light Power LED no Light...
  • Page 27 2-2 Has audio but no video out...
  • Page 28 Has video but no audio out Has image but no sound Make sure the Un-Mute by Mute function is Remote Controller Make sure the input source works Change source normally Speaker wire Re-connect the wire connects stoutly Check 12V at Pin 3 / 4 Check 12V at of P802 of Power Board Pin 3 /4 of CN1...

  • Page 29: Exploded View

    APPENDIX-B: SPB42 Exploded View 33 28...
  • Page 30 APPENDIX-B: SPC42 Exploded View...

  • Page 31: Replacement Parts List

    PST-12 (GIN LIAN) TZZ00000079A MYLAR AL TAPE TZZ00000082A SCREW TZZ00000083A SCREW+LOCK WASHER(8) TZZ00000089A TAPPING SCREW TZZ00000110A SCREW(NL) TZZ00000139A REMO CTRL AAA LCD MODU OWNER'S MANUAL EPS FOAM (T-L) EPS FOAM (T-R) EPS FOAM (B-L) EPS FOAM (B-R) EPS FOAM (B-M) CARTON-TH-L42U5D...

  • Page 32: Boards Layout

    10. Boards Layout Ref No. Board Name Function Remrks PCBA IR/B Remote Receiver, LED All boards are non servicable FIRMWARE M/B Main Board, Audio & Video Signal Processing and should be exchanged for PWR MODU Power (AD/DC), DC-DC service KEY PLATE ASSY Control Button...

  • Page 33: Disassembly And Assembly Instructions

    11 Disassembly and Assembly Instructions 11.1. Stand 1. Lay down the unit so that the rear cover faces upward. 2. Remove the 4 screws. 3. Remove the stand 11.2. Rear cover 1. Remove the total 19 screws. 2. Remove the rear cover.
  • Page 34 11.3. Remove AC cord 1. Remove the bushing of the AC cord from the AC cord bracket. 2. Disconnect the connector (P1) of AC cord. 11.4. P-Board 1. Remove the 6 screws. 2. Disconnect the connectors (P2, P3). 3. Remove the P-Board.
  • Page 35 11.5. M-Board 1. Remove the 3 screws. 2. Disconnect the connectors (P1, P2, P3, P4). 3. Remove the M-Board. 4. Remove the PCB-support. 11.6. Speaker unit 1. Remove the 2 screws. 2. Remove the speaker units.
  • Page 36 11.7. IR-Board 1. Remove the 1 screw. 2. Remove the IR-Board. 11.8. Metal parts I 1. Remove the 11 screws. 2. Remove the metal parts (m1,m2, m3,m4,m5,m6,m7).
  • Page 37 11.9. Metal parts II 1. Remove the 1 screw. 2. Remove the metal part (m8). 11.10. Metal parts III 1. Remove the 1 screw. 2. Remove the metal part (m9).
  • Page 38 11.11. Key plate 1. Remove the 2 screws. 2. Remove the key plate. 11.12. LCD Panel 1. Remove the LCD panel.

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