Panasonic TH-L24XM6G Schematic

ORDER NO. MTV1301136CE

LED TV

Model No. TH-L24XM6G

Chassis: KM23

Destination: INDONESIA

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

5.1.3. Display of SOS History -----------------------------10

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

5.1.5. Exit-------------------------------------------------------10

5.1.6. Self Check (Device) --------------------------------- 11

PAG E PAG E

5.1.7. Hotel Mode Adjustment ---------------------------- 11

5.1.8. 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. LVDS and LED Assembly ----------------------------- 14

7.2. LCD Panel Fixing & Handling Method -------------- 15

7.3. Installing Metal Chassis Frame----------------------- 16

7.4. Small Part & Tightening Screw ----------------------- 17

7.5. Pedestal Assembly -------------------------------------- 19

8 Measurements and Adjustments -------------------------- 20

8.1. Voltage chart of A-board ------------------------------- 20

8.2. Voltage chart of P-board ------------------------------- 20

9 Block Diagram --------------------------------------------------- 21

9.1. Main Block Diagram ------------------------------------- 21

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10 Wiring Connection Diagram --------------------------------- 22

10.1. Wire Dressing --------------------------------------------- 22

11 Schematic Diagram--------------------------------------------- 23 12 Printed Circuit Board ------------------------------------------ 36 13 Exploded View and Replacement Parts List -----------41

13.1. Exploded View and Mechanical Replacement Parts List --------------------------------------------------- 41

TH-L24XM6G

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

0.15F 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-L24XM6G

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-L24XM6G

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-L24XM6G

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

4 Specifications

Power Source AC Single 220 - 240 V, 50 / 60 Hz Power Consumption

Power Rating 41 W Standby Condition 0.3 W

Display panel

Panel TFT LCD Module with LED Backlight Visible screen size (diagonal) 61 cm (24 inches) Number of pixels 1,049,088 (1,366 (W)  768 (H))

Sound

Speaker (100 mm  30 mm)  2 pcs, 8  Audio Output 6 W (3 W + 3 W), 10% THD

Dimensions (W  H  D)

With Pedestal (mm) 576  416  180 TV only (mm) 576  351  59

Mass (Net)

With Pedestal (kg) 5.0

TV only (kg) 4.5 Aerial - Rear VHF / UHF Receiving Systems / Band name 17 SYSTEMS FUNCTIONS

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

NTSC M (NTSC 3.58 / 4.5 MHz) 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 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.)

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 ) COMPONENT Y 1.0 V [p-p] (including synchronization)

, PR/C

B/CB

AV2 IN AUDIO L-R RCA PIN Type  2 0.5 V [rms]

VIDEO RCA PIN Type  1 1.0 V [p-p] (75 )

AUDIO OUT AUDIO L-R RCA PIN Type  2 0.5 V [rms]

Reception of broadcast transmissions and

Playback from Video Cassette Tape

Recorders

Playback from Special VCR’s or DVD

Playback from Special Disc Players and

Special VCR’s or DVD

±0.35 V [p-p]

TH-L24XM6G

HDMI AV IN TYPE A Connectors  2 USB

USB 2.0 TYPE A Connectors

 1 DC 5 V, Max. 500 mA

Note

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

TH-L24XM6G

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

WB-ADJ R-GAIN 8D

G-GAIN AE

B-GAIN FF

R-CENT 6C

G-RENT 80

B-CENT A0

OPTION Boot ROM

STBY-SET 00

EMERGENCY ON

CLK MODE 00

CLOCK FC7

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.

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5.1.3. 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].

5.1.4. 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.

5.1.5. Exit

1. Disconnect the AC cord from wall outlet.

TH-L24XM6G

5.1.6. Self Check (Device)

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.

NOTE: After self check, the following process need to follow. TVA and QC.

5.1.7. 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.

5.1.8. 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

Initial 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.

Initial POS 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.

Initial VOL Level Adjust the volume when each time power is

switched on. Range : 0 to 100

Maximum VOL LEVEL

Button Lock Restrict the OSD.

Remote Lock Select front key conditions.

Adjust maximum volume. Range : 0 to 100

Selection : OFF/PATTERN1

• OFF: No restriction

• PATTERN1: restriction

Selection : OFF/PATTERN1/ALL

• OFF: altogether valid.

• PATTERN1: only input key is valid.

• ALL: altogether invalid.

TH-L24XM6G

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

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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 RTD_POWER_SOS PNL 12V power down 3

3 RTD_SOUND_SOS SOS from audio AMP 9

4 OVP OVP from Power Board 12

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-L24XM6G

7 Disassembly and Assembly Instructions

7.1. LVDS and LED Assembly

1. Fix LCD PANEL, LED PANEL ( with board & wire ) to CABINET COMPLETE ASSY.

2. Fix LVDS CABLE and PET TAPE to LCD PANEL. < Caution Point > Need to do iron blow at LVDS connector and panel before insert. And make sure connector did not slanting.

No Description Qty UOM Remarks

01 CABINET COMPLETE ASSY 1 PC

02 LED PANEL 1 PC

03 LCD PANEL 1 PC

04 LVDS CABLE 1 PC

05 PET TAPE 0.28 MT 4  70mm

06 PET TAPE 0.10 MT 1  100mm

7.2. LCD Panel Fixing & Handling Method

1. Place down the cabinet as shown below.

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

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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.

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7.3. Installing Metal Chassis Frame

1. Fixing Metal CH Frame to LCD Panel.

2. Fixing screw to LCD Panel & Metal CH Frame at left bottom side.

3. Stick Barrier P (Peel off the separator) to Metal CH Frame.

4. Stick Felt & Sponge to Metal CH Frame.

No Description Qty UOM Remarks

01 METAL CH FRAME 1 PC

02 BARRIER P-PCB 1 PC

03 SCREW(LCD1) 1 PC 3 ± 1Kgf.cm

04 FELT 4 PC

05 SPONGE 2 PC

7.4. Small Part & Tightening Screw

1. Insert P-print and A-print to Metal CH Frame.

2. Fixing small mechanical part to set (cabinet & metal ch.frame).

3. Fixing Key Indi Sheet to Key Button Bracket and slot at P-print board.

4. Screw them by screw.

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