Panasonic TH-L24XM6G Schematic

ORDER NO. MTV1301136CE

LED TV

Model No. TH-L24XM6G

Chassis: KM23

Destination: INDONESIA

TABLE OF CONTENTS

	PAGE			PAGE
1	Safety Precautions-----------------------------------------------	3	5.1.7. Hotel Mode Adjustment----------------------------	11
	1.1. General Guidelines----------------------------------------	3	5.1.8. Hotel Mode--------------------------------------------	11
	1.1.1. Leakage Current Cold Check----------------------	3	6 Troubleshooting Guide ---------------------------------------	12
	1.1.2. Leakage Current Hot Check (See Figure		6.1. Check of the IIC bus lines------------------------------	12
	1.) ---------------------------------------------------------	3	6.1.1. How to access ---------------------------------------	12
2	Warning--------------------------------------------------------------	4	6.1.2. Exit ------------------------------------------------------	12
	2.1. Prevention of Electrostatic Discharge (ESD)		6.1.3. Screen Display---------------------------------------	12
	to Electrostatically Sensitive (ES) Devices----------	4	6.2. Power LED Blinking timing chart ---------------------	13
	2.2. About lead free solder (PbF)----------------------------	5	6.3. No Power---------------------------------------------------	13
3	Service Navigation -----------------------------------------------	6	7 Disassembly and Assembly Instructions---------------	14
	3.1. Service Hint -------------------------------------------------	6	7.1. LVDS and LED Assembly -----------------------------	14
4	Specifications -----------------------------------------------------	7	7.2. LCD Panel Fixing & Handling Method --------------	15
5	Service Mode ------------------------------------------------------	9	7.3. Installing Metal Chassis Frame-----------------------	16
	5.1. How to enter into Service Mode -----------------------	9	7.4. Small Part & Tightening Screw -----------------------	17
	5.1.1. Contents of adjustment mode ---------------------	9	7.5. Pedestal Assembly --------------------------------------	19
	5.1.2. How to exit----------------------------------------------	9	8 Measurements and Adjustments --------------------------	20
	5.1.3. Display of SOS History -----------------------------	10	8.1. Voltage chart of A-board -------------------------------	20
	5.1.4. POWER ON TIME/COUNT -----------------------	10	8.2. Voltage chart of P-board -------------------------------	20
	5.1.5. Exit-------------------------------------------------------	10	9 Block Diagram ---------------------------------------------------	21
	5.1.6. Self Check (Device) ---------------------------------	11	9.1. Main Block Diagram -------------------------------------	21

© Panasonic Corporation 2013.

TH-L24XM6G
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

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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

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TH-L24XM6G

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).

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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)

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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

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4 Specifications

Power Source Power Consumption

Power Rating Standby Condition

Display panel Panel

Visible screen size (diagonal) Number of pixels

Sound Speaker

Audio Output

Dimensions (W H D)

With Pedestal (mm) TV only (mm)

Mass (Net)

With Pedestal (kg) TV only (kg)

Aerial - Rear

Receiving Systems / Band name

Receiving Channels

VHF BAND

UHF BAND

CATV

Operating Conditions
Connection Terminals
AV1 IN	AUDIO L-R
	VIDEO
	COMPONENT
AV2 IN	AUDIO L-R
	VIDEO
AUDIO OUT	AUDIO L-R

TH-L24XM6G

	AC Single 220 - 240 V, 50 / 60 Hz
	41 W
	0.3 W
	TFT LCD Module with LED Backlight
	61 cm (24 inches)
	1,049,088 (1,366 (W) 768 (H))
	(100 mm 30 mm) 2 pcs, 8
	6 W (3 W + 3 W), 10% THD
	576 416 180
	576 351 59
	5.0
	4.5
	VHF / UHF
	17 SYSTEMS	FUNCTIONS
1	PAL B, G, H
2	PAL I
3	PAL D, K	Reception of broadcast transmissions and
4	SECAM B, G	Playback from Video Cassette Tape
5	SECAM D, K	Recorders

6SECAM K1

7NTSC M (NTSC 3.58 / 4.5 MHz)

8NTSC 4.43 / 5.5 MHz

9NTSC 4.43 / 6.0 MHz

10NTSC 4.43 / 6.5 MHz

	11	NTSC 3.58 / 5.5 MHz	Playback from Special VCR’s or DVD
	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
			Special VCR’s or DVD
	17	PAL 60 Hz / 6.5 MHz
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)
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)
S1 - S20		(OSCAR)
1 - 125		(USA CATV)
C13 - C49		(JAPAN)
S21 - S41		(HYPER)
Z1 - Z37		(CHINA)
5A, 9A		(AUST.)
		Temperature : 0 C - 40 C,
		Humidity : 20 % - 80 % RH (non-condensing)
		RCA PIN Type 2	0.5 V [rms]
		RCA PIN Type 1	1.0 V [p-p] (75 )
		Y	1.0 V [p-p] (including synchronization)
		PB/CB, PR/CR	±0.35 V [p-p]
		RCA PIN Type 2	0.5 V [rms]
		RCA PIN Type 1	1.0 V [p-p] (75 )
		RCA PIN Type 2	0.5 V [rms]

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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.

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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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TH-L24XM6G

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.

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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	Adjust maximum volume.
LEVEL	Range :
	0 to 100
Button Lock	Restrict the OSD.
	Selection :
	OFF/PATTERN1
	• OFF: No restriction
	• PATTERN1: restriction
Remote Lock	Select front key conditions.
	Selection :
	OFF/PATTERN1/ALL
	• OFF: altogether valid.
	• PATTERN1: only input key is valid.
	• ALL: altogether invalid.

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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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TH-L24XM6G

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.)

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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

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TH-L24XM6G

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.

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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TH-L24XM6G

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

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TH-L24XM6G

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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