Panasonic TX-L42E5E Service Manual and Repair Guide

© Panasonic Corporation 2012. Unauthorized copying and distribution is a violation of law. ORDER NO. MTV1203016CE LCD HDTV Model No. TC-L42E5 Chassis: LA35 Destination: USA TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions ----------------------------------------------- 3 1.1. General Guidelines---------------------------------------- 3 1.1.1. Leakage Current Cold Check---------------------- 3 1.1.2. Leakage Current Hot Check (See Figure 1.) --------------------------------------------------------- 3 2 Warning -------------------------------------------------------------- 4 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensitive (ES) Devices---------- 4 2.2. About lead free solder (PbF)---------------------------- 5 3 Service Navigation ----------------------------------------------- 6 3.1. Service Hint ------------------------------------------------- 6 4 Specifications ----------------------------------------------------- 7 5 Service Mode ------------------------------------------------------ 8 5.1. How to enter into Service Mode ----------------------- 8 5.1.1. Contents of adjustment mode --------------------- 8 5.1.2. How to exit---------------------------------------------- 8 5.2. SRV-TOOL -------------------------------------------------- 9 5.2.1. How to access ----------------------------------------- 9 5.2.2. Display of SOS History ------------------------------ 9 5.2.3. POWER ON TIME/COUNT ------------------------ 9 5.2.4. Exit --------------------------------------------------------9 5.2.5. Self Check Mode ------------------------------------ 10 5.2.6. Hotel Mode Adjustment---------------------------- 10 5.2.7. Hotel Mode-------------------------------------------- 10 6 Troubleshooting Guide --------------------------------------- 11 6.1. Check of the IIC bus lines------------------------------ 11 6.1.1. How to access --------------------------------------- 11 6.1.2. Exit ------------------------------------------------------ 11 6.1.3. Screen display --------------------------------------- 11 6.2. Power LED Blinking timing chart --------------------- 12 6.3. No Power--------------------------------------------------- 12 7 Disassembly and Assembly Instructions--------------- 13 7.1. Control Panel Preparation ----------------------------- 13 7.2. Control Panel Assembly-------------------------------- 14 7.3. Speaker Assembly--------------------------------------- 15 7.4. Panel Assembly ------------------------------------------ 16 7.5. LCD Panel Fixing & Handling Method -------------- 17 7.6. Placing Black Tape -------------------------------------- 18 7.7. LED Panel Assembly------------------------------------ 19 7.8. Screwing up Brackets----------------------------------- 20

TC-L42E5 2 7.9. Plate Metal Part Assembly----------------------------- 21 7.10. LVDS Cable Assembly---------------------------------- 22 7.11. Fitting the Barrier----------------------------------------- 23 7.12. Plate A Assembly ---------------------------------------- 24 7.13. Plate P Assembly ---------------------------------------- 25 7.14. Assembling the Metal AV Bracket Side------------- 26 7.15. Assembling the Metal AV Bracket BTM ------------ 27 7.16. Fitting The Shading-------------------------------------- 28 7.17. Bottom Cover Assembly-------------------------------- 29 7.18. Back Cover Preparation -------------------------------- 30 7.19. Screwing up the Back Cover -------------------------- 31 8 Measurements and Adjustments -------------------------- 32 8.1. Voltage chart of A-board-------------------------------- 32 8.2. Voltage chart of P-board-------------------------------- 32 9 Block Diagram --------------------------------------------------- 33 9.1. Main Block Diagram ------------------------------------- 33 9.2. Detailed Block Diagram (1/2)-------------------------- 34 9.3. Detailed Block Diagram (2/2)-------------------------- 35 10 Wiring Connection Diagram --------------------------------- 36 10.1. Cable Alignment ------------------------------------------ 36 11 Schematic Diagram--------------------------------------------- 37 11.1. Schematic Diagram Notes ----------------------------- 37 11.2. A-Board (1/17) Schematic Diagram ----------------- 38 11.3. A-Board (2/17) Schematic Diagram ----------------- 39 11.4. A-Board (3/17) Schematic Diagram ----------------- 40 11.5. A-Board (4/17) Schematic Diagram ----------------- 41 11.6. A-Board (5/17) Schematic Diagram ----------------- 42 11.7. A-Board (6/17) Schematic Diagram ----------------- 43 11.8. A-Board (7/17) Schematic Diagram ----------------- 44 11.9. A-Board (8/17) Schematic Diagram ----------------- 45 11.10. A-Board (9/17) Schematic Diagram ----------------- 46 11.11. A-Board (10/17) Schematic Diagram ---------------47 11.12. A-Board (11/17) Schematic Diagram---------------- 48 11.13. A-Board (12/17) Schematic Diagram --------------- 49 11.14. A-Board (13/17) Schematic Diagram --------------- 50 11.15. A-Board (14/17) Schematic Diagram --------------- 51 11.16. A-Board (15/17) Schematic Diagram --------------- 52 11.17. A-Board (16/17) Schematic Diagram --------------- 53 11.18. A-Board (17/17) Schematic Diagram --------------- 54 11.19. GK-Board Schematic Diagram ----------------------- 55 11.20. K-Board Schematic Diagram-------------------------- 56 11.21. P-Board Schematic Diagram-------------------------- 57 12 Printed Circuit Board ------------------------------------------ 58 12.1. A-BOARD -------------------------------------------------- 58 12.2. K-BOARD -------------------------------------------------- 60 12.3. P-BOARD -------------------------------------------------- 61 13 Exploded View and Replacement Parts List ----------- 63 13.1. Exploded View and Mechanical Replacement Parts List --------------------------------------------------- 63 13.2. Electrical Replacement Parts List-------------------- 63 13.2.1. Replacement Parts List Notes ------------------- 63 13.2.2. Electrical Replacement Parts List --------------- 64

TC-L42E5 3 1 Safety Precautions 1.1. General Guidelines 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed. 3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards. 4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials. 5. 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. Replace the entire wiring unit instead. 6. When conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or unplug them straight out. 1.1.1. Leakage Current Cold Check 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be 100 Mohm and over. When the exposed metal does not have a return path to the chassis, the reading must be . 1.1.2. Leakage Current Hot Check (See Figure 1.) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 1.5kohm, 10 watts resistor, in parallel with a 0.15μF capacitors, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer. Figure 1

TC-L42E5 4 2 Warning 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor [chip] components. The following techniques should be used to help reduce the incidence of component damage caused by electrostatic discharge (ESD). 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as [anti-static (ESD protected)] can generate electrical charge sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise ham less motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

TC-L42E5 5 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. This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d suggest the use of Pb free solder as well, although Pb solder may be used. PCBs manufactured using lead free solder will have the PbF within a leaf Symbol PbF stamped on the back of PCB. Caution • Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F (30~40 °C) higher. Please use a high temperature soldering iron and set it to 700 ± 20 °F (370 ± 10 °C). • Pb free solder will tend to splash when heated too high (about 1100 °F or 600 °C). If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder. • After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto the opposite side. (see figure below)

TC-L42E5 6 3 Service Navigation 3.1. Service Hint Board Name Main Device Remarks A BOARD TUN, OFDM, ADV, LD4, STBY EEP Repairable P BOARD Power Supply Repairable GK BOARD Function SW for LGD panel Repairable K BOARD LED/RM/CATS Repairable

TC-L42E5 7 4 Specifications Note • Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate. Power Source AC 110-127 V, 60 Hz Power Consumption Rated Power Consumption 85 W Standby condition 0.1 W Display panel Aspect Ratio 16:9 Visible screen size 42” class (42 inches measured diagonally) Number of pixels 2,073,600 (1,920 (W) × 1,080 (H)) [5,760 × 1,080 dots] Sound Speaker 1-way 2 bottom SP System Audio Output 20 W [10 W + 10 W], (10% THD) PC signals VGA, WVGA, SVGA, XGA, WXGA, SXGA Horizontal scanning frequency 31 - 64 kHz Vertical scanning frequency 59 - 61 Hz Channel Capability-ATSC/NTSC (Digital/Analog) VHF/ UHF: 2 - 69, CATV: 1 - 135 Operating Conditions Temperature : 32°F - 95°F (0°C - 35°C) Humidity : 20 % - 80 % RH (non-condensing) Connection Terminals VIDEO IN VIDEO: RCA PIN Type × 1 1.0V [p-p] (75 Ω) AUDIO L - R RCA PIN Type × 2 0.5V [rms] COMPONENT IN Y: 1.0 V [p-p] (including synchronization) P B , P R : ± 0.35 V [p-p] AUDIO L - R: RCA PIN Type × 2 0.5 V [rms] HDMI 1-4 TYPE A Connector × 4 • This TV supports ‘HDAVI Control 5’ function. USB USB 2.0 Type A connector × 2 (DC5V MAX500mA) LAN (for IPTV) RJ45 (10BASE-T/100BASE-TX) PC D-SUB 15 PIN: R, G, B / 0.7 V [p-p] (75 Ω) HD, VD / 1.0-5.0 V [p-p] (high impedance) Card slot SD CARD slot × 1 DIGITAL AUDIO OUT PCM / Dolby Digital, Fiber Optic FEATURES 3D Y/C FILTER CLOSED CAPTION V-Chip EASY IPTV Vesa compatible VIERA IMAGE VIEWER Media player HDAVI Control 5 Dimensions (W x H x D) Including TV Stand 39.3” × 25.6” × 9.8” (997 mm × 650 mm × 247 mm) TV Set only 39.3” × 23.8” × 2.1” (997 mm × 604 mm × 52 mm) Mass Including TV stand 37.5lb. (17 kg) NET TV Set only 30.9 lb. (14 kg) NET

TC-L42E5 8 5 Service Mode 5.1. How to enter into Service Mode While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds. 5.1.1. Contents of adjustment mode • Value is shown as a hexadecimal number. • Preset value differs depending on models. • After entering the adjustment mode, take note of the value in each item before starting adjustment. 5.1.2. How to exit Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control. Main item Sub item Sample Data ADJUST CONTRAST 000 COLOR 59 TINT FE SUB-BRT 800 BACKLGT 20D B-Y-G 40 R-Y-A 0 VCOM 189 WB-ADJ R-GAIN 75 G-GAIN 80 B-GAIN 65 R-CENT 80 G-CENT 80 B-CENT 9B OPTION Boot ROM STBY-SET 00 EMERGENCY ON CLK MODE 00 CLOCK FC7 EDID-CLK HIGH SRV-TOOL 00

TC-L42E5 9 5.2. SRV-TOOL 5.2.1. How to access 1. Select [SRV-TOOL] in Service Mode. 2. Press [OK] button on the remote control. 5.2.2. Display of SOS History SOS History (Number of LED blinking ) indication. From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment. This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory shipment setting]. 5.2.3. POWER ON TIME/COUNT Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3sec. Time : Cumulative power on time, indicated hour : minute by decimal Count : Number of ON times by decimal Note : This indication will not be cleared by either of the self-checks or any other command. 5.2.4. Exit 1. Disconnect the AC cord from wall outlet.

TC-L42E5 10 5.2.5. Self Check Mode 1. Press the ‘MENU’ button (on the remote control) and the ‘VOL DOWN’ button on the LCD panel. 2. Press ON/OFF button on the panel to Exit. 5.2.6. Hotel Mode Adjustment 1. Press the ‘VOLUME DOWN’ button on the TV panel and simultaneously press the INPUT button on the remote control 3 times to enter Hotel Mode. 2. Set Hotel mode ‘on/off’, then press ‘EXIT’ to come out. 5.2.7. Hotel Mode 1. Purpose Restrict a function for hotels. 2. Access command to the Hotel mode setup menu. In order to display the Hotel mode setup menu, please enter the following command (within 2 second). [TV] : Vol [Down] + [REMOTE] : INPUT (3 times). Then, the Hotel mode setup menu is displayed. 3. To exit the Hotel mode setup menu Disconnect AC power cord from wall outlet. 4. Explain the Hotel mode setup menu Item Function Mode Select hotel mode off/on Input Select input signal modes. Set the input, when each time power is switched on. Selection : -/RF/HDMI1/HDMI2/HDMI3/Component/ Video/PC • Off: give priority to a last memory. Channel Select channel when input signal is RF. Set the channel, each time power is switched on. Selection : Any channel number or [-]. [-] means the channel when turns off. Volume Adjust the volume when each time power is switched on. Range : 0 to 100 Vol. Max Adjust maximum volume. Range : 0 to 100 OSD Ctrl Restrict the OSD. Selection : OFF/PATTERN1 • OFF: No restriction • PATTERN1: restriction FP Ctrl Select front key conditions. Selection : OFF/PATTERN1/ALL • OFF: altogether valid. • PATTERN1: only input key is valid. • ALL: altogether invalid. Pow Ctrl Select POWER-ON/OFF condition when AC power cord is disconnected and then connected. OFF: The same condition when AC power cord is disconnected. ON: Forced power ON condition.

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Panasonic TX-L42E5E Service Manual and Repair Guide

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