Panasonic TH-L42ET5D Service manual

ORDER NO. PAVCI1204028CE

Model No. TH-L42ET5D

Chassis: LA35

Destination:INDIA

LED TV

TABLE OF CONTENTS

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 ------------------------------------------------------ 9

5.1. How to enter into Service Mode ----------------------- 9

5.1.1. Contents of adjustment mode --------------------- 9

5.1.2. How to exit---------------------------------------------- 9

5.2. SRV-TOOL -------------------------------------------------10

5.2.1. How to access ----------------------------------------10

5.2.2. Display of SOS History -----------------------------10

5.2.3. POWER ON TIME/COUNT -----------------------10

PAG E PAG E

5.2.4. Exit ------------------------------------------------------ 10

5.2.5. Self Check Mode ------------------------------------ 11

5.2.6. Hotel Mode Adjustment ---------------------------- 11

5.2.7. Hotel Mode-------------------------------------------- 11

6 Troubleshooting Guide --------------------------------------- 12

6.1. Check of the IIC bus lines------------------------------ 12

6.1.1. How to access --------------------------------------- 12

6.1.2. Exit ------------------------------------------------------ 12

6.1.3. Screen display --------------------------------------- 12

6.2. Power LED Blinking timing chart --------------------- 13

6.3. No Power--------------------------------------------------- 13

7 Disassembly and Assembly Instructions--------------- 14

7.1. Control Button Fixing------------------------------------ 14

7.2. SP Bracket & Metal Bottom --------------------------- 16

7.3. LVDS & Metal Part Assembly------------------------- 17

7.4. LCD Panel Fixing & Handling Method -------------- 18

7.5. LED Panel and Bracket Assembly------------------- 19

7.6. Screw Fixing----------------------------------------------- 20

7.7. Bracket Assembly 1 ------------------------------------- 21

7.8. Bracket Assembly 2 ------------------------------------- 22

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7.9. Fixing Gasket---------------------------------------------- 24

7.10. LVDS FFC / BTM Cover Fixing 1---------------------25

7.11. LVDS FFC / BTM Cover Fixing 2--------------------- 26

7.12. LVDS FFC / BTM Cover Fixing 3---------------------27

7.13. LVDS FFC / BTM Cover Fixing 4---------------------28

7.14. Back Cover Assembly----------------------------------- 29

8 Measurements and Adjustments -------------------------- 30

8.1. Voltage chart of A-board-------------------------------- 30

8.2. Voltage chart of P-board-------------------------------- 30

9 Block Diagram --------------------------------------------------- 31

9.1. Main Block Diagram ------------------------------------- 31

9.2. Detailed Block Diagram (1/2)-------------------------- 32

9.3. Detailed Block Diagram (2/2)-------------------------- 33

10 Wiring Connection Diagram --------------------------------- 34

10.1. Wire Dressing --------------------------------------------- 34

11 Schematic Diagram--------------------------------------------- 35

11.1. Schematic Diagram Notes ----------------------------- 35

11.2. A-Board (1/17) Schematic Diagram ----------------- 36

11.3. A-Board (2/17) Schematic Diagram ----------------- 37

11.4. A-Board (3/17) Schematic Diagram ----------------- 38

11.5. A-Board (4/17) Schematic Diagram ----------------- 39

11.6. A-Board (5/17) Schematic Diagram ----------------- 40

11.7. A-Board (6/17) Schematic Diagram ----------------- 41

11.8. A-Board (7/17) Schematic Diagram ----------------- 42

11.9. A-Board (8/17) Schematic Diagram ----------------- 43

11.10. A-Board (9/17) Schematic Diagram ----------------- 44

11.11. A-Board (10/17) Schematic Diagram --------------- 45

11.12. A-Board (11/17) Schematic Diagram---------------- 46

11.13. A-Board (12/17) Schematic Diagram --------------- 47

11.14. A-Board (13/17) Schematic Diagram --------------- 48

11.15. A-Board (14/17) Schematic Diagram --------------- 49

11.16. A-Board (15/17) Schematic Diagram --------------- 50

11.17. A-Board (16/17) Schematic Diagram --------------- 51

11.18. A-Board (17/17) Schematic Diagram --------------- 52

11.19. GK-Board Schematic Diagram ----------------------- 53

11.20. K-Board Schematic Diagram -------------------------- 54

11.21. P-Board Schematic Diagram -------------------------- 55

12 Printed Circuit Board ------------------------------------------ 56

12.1. A-BOARD -------------------------------------------------- 56

12.2. K-BOARD -------------------------------------------------- 58

12.3. P-BOARD -------------------------------------------------- 59

13 Exploded View and Replacement Parts List -----------61

13.1. Exploded View and Mechanical Replacement Parts List --------------------------------------------------- 61

13.2. Electrical Replacement Parts List -------------------- 61

13.2.1. Replacement Parts List Notes ------------------- 61

13.2.2. Electrical Replacement Parts List ---------------62

TH-L42ET5D

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

TH-L42ET5D

2Warning

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).

TH-L42ET5D

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)

TH-L42ET5D

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

K BOARD LED/RM/CATS Repairable

GK BOARD Function SW for LGD panel Repairable

4 Specifications

Power Source AC 110 - 240 V, 50 / 60 Hz Power Consumption

Power Rating 113 W Standby Condition 0.2 W

Display panel

Panel system IPS LED backlight Liquid Crystal Display Visible screen size (diagonal) 107 cm / 42 inches Number of pixels 2,073,600 (1,920 (W) × 1,080 (H))

Dimensions (W × H × D) 997 mm × 650 mm × 247 mm (With Pedestal)

997 mm × 604 mm × 52 mm (TV only)

Mass 17.0 kg Net (With Pedestal)

14.0 kg Net (TV only)

Sound

Speaker (75 mm × 22 mm) × 2, 8 Ω Audio Output 20 W (10 W + 10 W) Headphones M3 (3.5 mm) stereo mini Jack × 1

Receiving Systems / Band name 17 SYSTEMS FUNCTIONS

1 PAL B, G, H 2 PAL I 3 PAL D, K 4 SECAM B, G 5 SECAM D, K 6 SECAM K1 7

NTSC M (NTSC 3.58 / 4.5MHz)

8 NTSC 4.43 / 5.5 MHz

9 NTSC 4.43 / 6.0 MHz 10 NTSC 4.43 / 6.5 MHz 11 NTSC 3.58 / 5.5 MHz 12 NTSC 3.58 / 6.0 MHz 13 NTSC 3.58 / 6.5 MHz 14 SECAM I 15 PAL 60 Hz / 5.5 MHz Playback from Special Disc Players and 16 PAL 60 Hz / 6.0 MHz 17 PAL 60 Hz / 6.5 MHz

Receiving Channels

VHF BAND 2 - 12 (PAL / SECAM B, K1)

0 - 12 (PAL B AUST.)

1 - 9 (PAL B N.Z.) 1 - 12 (PAL / SECAM D) 1 - 12 (NTSC M JAPAN) 2 - 13 (NTSC M USA)

UHF BAND 21 - 69 (PAL G, H, I / SECAM G, K, K1)

28 - 69 (PAL B AUST.) 13 - 57 (PAL D, K) 13 - 62 (NTSC M JAPAN) 14 - 69 (NTSC M USA)

CATV S1 - S20 (OSCAR)

1 - 125 (USA CATV)

C13 - C49 (JAPAN)

S21 - S41 (HYPER)

Z1 - Z37 (CHINA)

5A, 9A (AUST.)

Aerial - Rear VHF / UHF Operating Conditions Temperature : 0°C - 40°C

Humidity : 20 % - 80 % RH (non-condensing)

Connection Terminals

AV1 IN AUDIO L-R RCA PIN Type × 2 0.5 V [rms]

VIDEO RCA PIN Type × 1 1.0 V [p-p] (75 Ω) AUDIO OUT AUDIO L-R RCA PIN Type × 2 0.5 V [rms] (high impedance) AV2 IN AUDIO L-R RCA PIN Type × 2 0.5 V [rms]

COMPONENT Y 1.0 V [p-p] (including synchronisation)

, PR/C

B/CB

VIDEO RCA PIN Type × 1 1.0 V [p-p] (75 Ω)

Reception of broadcast transmission and

playback from video cassette tape recorders.

Playback from special VCR’s or DVD.

Special VCR’s or DVD.

±0.35 V[p-p]

TH-L42ET5D

HDMI 1 / 2 / 3 / 4 input TYPE A Connectors

• This TV supports ‘HDAVI Control 5’ function.

Card Slot SD Card slot × 1 ETHERNET 10BASE-T / 100BASE-TX USB 1 / 2 / 3 DIGITAL AUDIO OUT PCM / Dolby Digital / DTS, Fibre optic

Built-in wireless LAN

Standard compliance and Frequency range*

Security WPA2-PSK (TKIP/AES) WPA-PSK (TKIP/AES) WEP (64 bit/128 bit)

HIGH-DENSITY D-SUB 15 PIN R, G, B: 0.7 V[p-p] (75 Ω) HD, VD: TTL LEVEL 2.0-5.0 V [p-p] (high impedance)

• Applicable input signals:

VGA, SVGA, WVGA, XGA, SXGA, WXGA

USB 2.0 TYPE A Connectors

IEEE802.11a/n

5.15 GHz - 5.35 GHz, 5.47 GHz - 5.85 GHz IEEE802.11b/g/n

2.40 GHz - 2.4835 GHz

DC 5 V, Max. 500 mA

* The frequency and channel differ depending on the country.

3D Eyewear

Dimensions (W × H × D) 149.0 mm × 44.0 mm × 171.0 mm Mass Approx. 18 g Lens type Circularly-polarised filter Usage temperature range 0 °C - 40 °C Materials Main body: Resin

Lens section: Resin

Note

• Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.

TH-L42ET5D

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.

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

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.

TH-L42ET5D

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.

TH-L42ET5D

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.

TH-L42ET5D

6 Troubleshooting Guide

Use the self-check function to test the unit.

1. Checking the IIC bus lines

2. Power LED Blinking timing

6.1. Check of the IIC bus lines

6.1.1. How to access

Self-check indication only: Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control for more than 3 seconds. Self-check indication and forced to factory shipment setting: Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for more than 3 seconds.

6.1.2. Exit

Disconnect the AC cord from wall outlet.

6.1.3. Screen display

6.2. Power LED Blinking timing chart

1. Subject Information of LED Flashing timing chart.

2. Contents When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, the defective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:

Priority Name Factor R_LED Blink

1 BL_SOS SOS from PANEL inverter 1

2 POWER_SOS SOS from POWER Curcuit 3

3 SOUND_SOS SOS from audio AMP 9

6.3. No Power

First check point There are following 2 states of No Power indication by power LED.

1. No lit

2. Red is lit then turns red blinking a few seconds later. (See 6.2.)

TH-L42ET5D

7 Disassembly and Assembly Instructions

7.1. Control Button Fixing

Fixing all screw at panel, bracket and metal part.

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7.2. SP Bracket & Metal Bottom

1. Put the speaker bracket by inserting pins into the holes of the panel.

2. Insert the speakers on the speaker brackets.

7.3. LVDS & Metal Part Assembly

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7.4. LCD Panel Fixing & Handling Method

1. Place down the cabinet as shown below.

2. Fix LCD panel into the cabinet by taking below precautions.

Other general precautions

1. Do not press panel surface to avoid blue spot on the panel display.

2. Do not use hard cloth or rub the surface too hard. This may cause scratches on the surface.

3. Take care not to subject the TV’s surface to water or detergent. Any liquid (including pets urine) if enters the product could lead to TV failure.

4. Take care not to subject the surface to insect repellent, solvent, thiner or other voiltile substances. This may degrade surface quality or cause peeling of the paint.

5. The surface of the display panel is specially treated and may be easily damaged. Take care not to tap or scratch with your fingernail or other hard objects.