Panasonic TH-50LFE7U Servise Manual
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Panasonic TH-50LFE7U Servise Manual

Panasonic TH-50LFE7U Servise Manual

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FULL HD LCD Display
TH-50LFE7U
Model No.
TH-50LFE7W
TH-50LFE7E
LA55 Chassis
© Panasonic Corporation 2014
Unauthorized copying and distribution is a violation
of law.
ORDER NO.VED1406521CE
D06

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Summary of Contents for Panasonic TH-50LFE7U

  • Page 1 ORDER NO.VED1406521CE FULL HD LCD Display TH-50LFE7U Model No. TH-50LFE7W TH-50LFE7E LA55 Chassis © Panasonic Corporation 2014 Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions -----------------------------------------------3 1.1. General Guidelines ----------------------------------------3 1.2. Touch-Current Check (for TH-50LFE7U)-------------3 1.3. Touch-Current Check (for TH-50LFE7W/TH- 50LFE7E) ----------------------------------------------------4 2 Warning --------------------------------------------------------------5 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensitive (ES) Devices ----------5 2.2.

  • Page 3: Safety Precautions

    6. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards. 1.2. Touch-Current Check (for TH-50LFE7U) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

  • Page 4: Touch-Current Check (For Th-50Lfe7W/Th-50Lfe7E)

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 1.3. Touch-Current Check (for TH-50LFE7W/TH-50LFE7E) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1.

  • Page 5: Warning

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 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 6: About Lead Free Solder (Pbf)

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 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 7: Service Navigation

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 3 Service Navigation 3.1. Service Hint Board Name Function P-Board Power supply Non serviceable. P-Board should be exchanged for service. A-Board Digital core signal processor Non serviceable. A-Board should be exchanged for service. GK-Board Key, Power SW Non serviceable.

  • Page 8: Specifications

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 4 Specifications Power Source (U) 110 - 127 V AC, 50/60Hz Power Source (W, E) 220 - 240 V AC, 50/60Hz Power Consumption Rated Power Consumption 95 W Stand-by condition 0.5 W Power off condition 0.4 W Sound 25 mm  90 mm  2 pcs...

  • Page 9: Service Mode

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 5 Service Mode 5.1. CAT (Computer Aided Test) mode How to access the CAT mode. Method A Main unit + remote control operation Press and hold the button on the rear side of the unit and press the RECALL button on the remote control 3 times quickly within 2 second, this will place the unit into the CAT mode.
  • Page 10 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 5.1.2. CD mode Select the CD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button on the remote control more than 3 seconds. Memory data change To exit the CD mode, press the R button on the remote control.
  • Page 11 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 5.1.3. SD mode Select the SD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on the remote control. To exit the SD mode, press the R button on the remote control.
  • Page 12 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 5.1.5. NW mode Note : To use the network function, set each "Network Setup" setting and make sure to set the "Control I/F Select" to "LAN". Select the NW mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on the remote control.

  • Page 13: Iic Mode Structure (Following Items Value Is Sample Data)

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 5.2. IIC mode structure (following items value is sample data)

  • Page 14: Troubleshooting Guide

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 6 Troubleshooting Guide 6.1. Self Check 6.1.1. Display Indication 1. Self-check is used to automatically check the bus line controlled circuit of the LCD display. 2. To get into the Self-check mode, press the volume down button on the rear side of the unit, at the same time pressing the OFF-TIMER button on the remote control, and the screen will show.
  • Page 15 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 6.1.3. LCD Panel test mode...
  • Page 16 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E...

  • Page 17: No Power

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 6.2. No Power First check point There are following 3 states of No Power indication by power LED. 1. No lit. 2. Green is lit then turns red blinking a few seconds later. 3. Only red is lit. 6.3.

  • Page 18: Disassembly And Assembly Instructions

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 7 Disassembly and Assembly Instructions 7.1. PCB Layout 7.2. Preparation 7.3. About disassembly replacement Please spread soft cloth etc. not to damage a screen and please turn the front of a main part down and lay it down Cautions when replacing each component •...

  • Page 19: Backcover Comp Removal

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 7.4. Backcover Comp removal 2. Remove the screws, and then remove the A-Board from the Terminal Metal. 1. Remove the screws, and then remove the Backcover Comp. 7.5. A-Board replacement 1. Disconnect the connectors and remove the screws.
  • Page 20 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E Caution when replacing A-Board • Gaskets are included with the A-Board for repair. Please stick the gaskets on the position of the following fig- ure when replacing the A-Board.
  • Page 21 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E Caution when replacing the Treminal Metal • Felts are included with the Terminal Metal for repair. Please stick the Felts on the position of the following figure when replacing the Terminal Metal. Caution after replacing the A-Board • Since the electronic switch is adopted as a power switch of main unit, how the rise of the power of the initial state is dif- ferent from the case of a mechanical switch in the past.

  • Page 22: P-Board Replacement

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 7.6. P-Board replacement 7.7. GK-Board Button Bracket replacement 1. Disconnect the connectors and remove the screws, and then remove the P-Board. 1. Disconnect the connector and remove the screw, and then remove the GK-Board and Key Button Bracket. Caution when replacing the P-Board •...

  • Page 23: Speaker Unit (L) (R) Replacement

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 7.8. Speaker Unit (L) (R) replace- 7.9. K-Board, LED Panel and LED ment Panel Case replacement 1. Push the speaker terminal hook, and pull out the speaker 1. Remove the LED Panel Block. lead. 2. Disconnect the connector, and remove the K-Board, LED Panel and LED Panel Case.

  • Page 24: Lcd Panel Assy Replacement

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 7.10. LCD Panel Assy replacement 5. Disconnect the connectors and remove the screws, and then remove the P-Board. Caution about the sticking parts of LCD Panel Assy • The sticking parts for LCD Panel Assy are enclosed. When replacing the LCD Panel, please replace the sticking parts simultaneously.
  • Page 25 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E About the wire arrangement after replacing the LCD Panel Caution about the sticking parts of LCD Panel Assy • Please refer to the “9. Wiring Connection Diagram”. • Please remove the Barrier P PCB from the old LCD Panel...
  • Page 26 TH-50LFE7U/TH-50LFE7W/TH-50LFE7E • Please stick the tapes according to the sticking position of the LCD Panel Assy for repair after connecting the LVDS Cable. * Attachment specifications are subject to change without notice and parts may remain. * Please stick on the same place as before.

  • Page 27: Block Diagram

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 8 Block Diagram 8.1. Diagram Notes...

  • Page 28: Main Block Diagram

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 8.2. Main Block Diagram DIGITAL CORE SIGNAL PROCESSOR PWR15V MAIN CPU R_+/- SERIAL AUDIO SIGNAL SPEAKER(R) AUDIO DSP/AMP L_+/- SOS DET SPEAKER(L) LAN DATA CONTROL D3.3V +3.3V LAN TERMINAL D1.2V +1.2V MII DATA ROUT RXD/TXD_LAN AUDIO AUDIO OUT AUDIO...

  • Page 29: Block (1 Of 2) Diagram

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 8.3. Block (1 of 2) Diagram JK3503 JK4002 JK4004 JK5301 RS232C IN DIGITAL SIGNAL PROCESSOR DVI-D IN HDMI IN1 HDMI IN2 (SERIAL IN) NETWORK IC2701 IC2704 CONTROLLER LAN CONTROL Q2705 Q2704 PWM5V HWCTRL JK2701 IC4703 TXD0 DATA RXD_LAN RS232C...

  • Page 30: Block (2 Of 2) Diagram

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 8.4. Block (2 of 2) Diagram JK3505 JK4001 PC/DVI PC IN AUDIO IN DIGITAL SIGNAL PROCESSOR PWR15V IC5106 VGA_5V X4004 R(+) IC4702 19.6608MHz SPEAKER_R R(-) IC4501 VGA_SCL MAIN CPU AUDIO SP_MUTE L(-) EEPROM VGA_SDA L(+) SPEAKER_L SERIAL AUDIO SIGNAL...

  • Page 31: Wiring Connection Diagram

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 9 Wiring Connection Diagram...

  • Page 32: Exploded View And Replacement Parts List

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 10 Exploded View and Replacement Parts List 10.1. Exploded View...

  • Page 33: Packing And Accessories

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 10.2. Packing and Accessories...

  • Page 34: Parts List

    TH-50LFE7U/TH-50LFE7W/TH-50LFE7E 10.3. Parts List Safety Ref. No. Part No. Part Name & Description Remarks TBX5ZA03301 KEY BUTTON BRACKET TKK5ZC50501A LED PANEL TKP5ZA41701 LED PANEL CASE TKP5ZA41401 SP BRACKET TMM23417 SPACER TMME399 SPACER (P2) TQF0AA122 MODEL NUMBER LABEL VUM50TERKIT TERMINAL METAL Incl.

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