Panasonic TH-42A410T Schematic

ORDER NO. MTV1401167CE

Model No. TH-42A410T

Chassis: KM25

Destination: THAILAND

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 ------------------------------------------------------ 8

5.1. How to enter into Service Mode ----------------------- 8

5.1.1. Purpose ------------------------------------------------- 8

5.1.2. Key command ----------------------------------------- 8

5.1.3. How to exit---------------------------------------------- 8

5.1.4. Contents of adjustment mode --------------------- 8

5.1.5. Display of SOS History ------------------------------ 9

5.1.6. Exit-------------------------------------------------------- 9

PAG E PAG E

5.1.7. Hotel Mode----------------------------------------------9

6 Troubleshooting Guide --------------------------------------- 10

6.1. Check of the IIC bus lines------------------------------ 10

6.1.1. How to access --------------------------------------- 10

6.1.2. Self-check indication only ------------------------- 10

6.1.3. Self-check indication and forced to factory shipment setting ------------------------------------- 10

6.1.4. Exit ------------------------------------------------------ 10

6.1.5. Screen display --------------------------------------- 10

6.2. Power LED Blinking timing chart --------------------- 11

6.3. Method of detecting SOS ------------------------------ 11

6.4. LCD Panel test mode ----------------------------------- 12

6.5. No Power--------------------------------------------------- 12

7 Disassembly and Assembly Instructions--------------- 13

7.1. Speaker Fixing and Assembly ----------------------- 13

7.2. LCD Panel Fixing & Handling Method -------------- 14

7.3. Metal MTG Fixing --------------------------------------- 15

7.4. Key Button Assembly ----------------------------------- 16

7.5. Pedestal Assembly -------------------------------------- 17

7.6. Back Cover - Label & Screw -------------------------- 18

TH-42A410T

8 Measurements and Adjustments -------------------------- 19

8.1. Voltage chart of A-board-------------------------------- 19

8.2. Voltage chart of P-board-------------------------------- 19

9 Block Diagram --------------------------------------------------- 20

9.1. Main Block Diagram ------------------------------------- 20

10 Wiring Connection Diagram --------------------------------- 21

10.1. Wire Dressing 1------------------------------------------- 21

10.2. Wire Dressing 2------------------------------------------- 22

11 Schematic Diagram--------------------------------------------- 23 12 Printed Circuit Board ------------------------------------------ 41 13 Exploded View and Replacement Parts List -----------48

TH-42A410T

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-42A410T

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-42A410T

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-42A410T

3 Service Navigation

3.1. Service Hint

Board Name Main Device Remarks

A BOARD TUN, EEP, SPI, MTK IC Repairable

P BOARD Power Supply, Power switch, Keyscan Repairable

K BOARD Remote, LED,Luminence Sensor Repairable

GK BOARD Power Switch, Keyscan Repairable

LD BOARD LED driver Repairable

4 Specifications

Power source AC 220 - 240 V, 50/60 Hz Power consumption

(Rated power) 89 W

Display panel

Panel LCD panel (LED backlight) Visible screen size (diagonal) 106 cm Display resolution 1,920 (W)  1,080 (H)

Dimensions (W  H  D)

963 mm  610 mm  247 mm (With Pedestal) 963 mm  566 mm  69 mm (TV only)

Mass

Connection terminals

AV IN (COMPONENT / VIDEO) VIDEO RCA PIN Type  1, 1.0 V[p-p] (75 )

HDMI 1 / 2 input TYPE A Connectors USB USB 2.0 TYPE A Connectors

DIGITAL AUDIO OUT PCM / Dolby Digital / DTS, Fibre optic

Sound

Audio output 20 W (10 W + 10 W)

Receiving systems / Band name 17 SYSTEMS FUNCTION

Receiving channels (Analogue TV)

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

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

CATV S1 - S20 (OSCAR)

Aerial input VHF / UHF Operating conditions Temperature : 0°C - 40°C

Note

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

10.0 (With Pedestal)

8.5 (TV only)

AUDIO L - R RCA PIN Type  2, 0.5 V[rms] Y 1.0 V[p-p] (including synchronisation) P

, P

DC 5 V, Max. 500 mA

Digital TV 7 MHz VHF / 8 MHz UHF free-to-air TV broadcast reception

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

1 - 125 (USA CATV)

C13 - C49 (JAPAN)

S21 - S41 (HYPER)

Z1 - Z37 (CHINA)

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

±0.35 V[p-p]

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

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)

5A, 9A (AUST.)

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

TH-42A410T

5 Service Mode

5.1. How to enter into Service Mode

5.1.1. Purpose

After exchange parts, check and adjust the contents of adjustment mode. While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.

5.1.2. Key command

[1] button...Main items Selection in forward direction [2] button...Main items Selection in reverse direction [3] button...Sub items Selection in forward direction [4] button...Sub items Selection in reverse direction [VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )

5.1.3. How to exit

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.

5.1.4. 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 H POS

H AMP

V POS

V AMP

V COM

WB-ADJ R-GAIN 8D

G-GAIN AE

B-GAIN FF

R-CENT 6C

G-RENT 80

B-CENT A0

OPTION Boot upgrade NO

STBY-SET 00

EMERGENCY ON

CLK MODE 00

CLOCK FC7

Y/C DELAY DYNAMIC

OPT 1 00000000

OPT 2 11100110

OPT 3 00001001

OPT 4 00000000

EDID-CLK HIGH

TH-42A410T

5.1.5. 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].

5.1.6. Exit

1. Disconnect the AC cord from wall outlet.

5.1.7. 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: While pressing [VOLUME (-)] button of the main unit, press [AV] button of the remote control three times within 2 seconds.

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

Hotel Mode Select hotel mode On/Off

Initial INPUT Select input signal modes.

Set the input, when each time power is switched on. Selection : Off,Analogue,DVB-C,DVB-T,AV1,AV2,HDMI1, HDMI2

• Off: give priority to a last memory. However, Euro model is compulsorily set to TV.

Initial POS Select programme number.

Selection : Off/0 to 99

• Off: give priority to a last memory.

Initial VOL LEVEL Adjust the volume when each time power is switched

on. Selection Range : Off/0 to 100

• Off: give priority to a last memory.

Maximum Vol Level Adjust maximum volume.

Range : 0 to 100

Button Lock Select local key conditions.

Selection : Off/SETUP/MENU/ALL

• OFF: altogether valid

• SETUP: only F-key is invalid

(Tuning guide (menu) can not be selected.)

• MENU: only F-key is invalid (only Volume/Mute can be selected.)

• ALL: altogether invalid.

Remote Lock Select remote control key conditions.

Selection : Off/SETUP/MENU

• OFF: altogether valid.

• SETUP: only Setup menu is invalid.

• MENU: Picture/Sound/Setup menu are invalid.

Hotel Mode USB Basically after user already setup the hotel mode

according to their criteria, what they need to do is

• insert USB (while in hotel mode)

• choose ‘Copy TV to USB’ to copy the setting into the USB (a file will be created to store the hotel mode setting in the USB)

• switch ‘OFF’ the unit

• pull out USB from unit

To copy the hotel mode setting from USB.

• enter hotel mode

•insert USB

• choose ‘Copy USB to TV’

• follow instruction as shown on the units

• once finish, switch ‘OFF; the unit

• pull out USB from unit

Private Information Select private information for VIERA Cast is Keep or

Reset if Hotel mode is set to [On] when TV power on Selection : Keep/Reset

• Keep: private information for VIERA Cast is keep

• Reset: private information for VIERA Cast is reset

TH-42A410T

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

6.1.2. 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.

6.1.3. 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.

6.1.4. Exit

Disconnect the AC cord from wall outlet.

6.1.5. 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 TV_SOS TCON power down 3

3 SOUND_SOS SOS from audio AMP 9

6.3. Method of detecting SOS

1. BL_SOS Detection beginning after one second pass from ‘BL_ON’=ON

TH-42A410T

2. TV_SOS Detection beginning after one second pass from ‘AMP_SHUTDOWN’=ON

3. SOUND_SOS Detection beginning ‘AMP_SHUTDOWN’=ON

TH-42A410T

6.4. LCD Panel test mode

Purpose:

To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.

How to Enter:

While pressing [VOLUME ( - )] button of the main unit, press [OPTION] button of the remote control three times within 2 seconds.

How to Exit:

Disconnect AC plug from wall outlet.

How to confirm:

If the abnormal picture is displayed, go into LCD Panel test mode to display the several test patterns. And then, judge by the following method. Still abnormal picture is displayed: The cause must be in LCD Panel. Normal picture is displayed: The cause must be in A board.

Remarks:

The test pattern is created by the circuit in LCD Panel. In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal. If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.

6.5. 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.)

7 Disassembly and Assembly Instructions

7.1. Speaker Fixing and Assembly

1. Fix speaker bracket at panel and screw.

2. Stick sponge at speaker and slot at speaker bracket.

TH-42A410T

NO QTY UOM DESCRIPTION REMARK

01 2 PC SPEAKER UNIT

02 4 PC SCREW (A3/P5/VESA4/MTL4/LBRD4/SP4) 06 ± 1 Kgf.cm

03 4 PC SP BRACKET

04 4 PC SP. SPONGE

TH-42A410T

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.

7.3. Metal MTG Fixing

Fix metal and bottom panel into panel and screw.

TH-42A410T

NO QTY UOM DESCRIPTION REMARK

01 4 PC VESA METAL

02 2 PC BOTTOM METAL

03 7 PC SCREW (BC3/VESA4) 06 ± 1 Kgf.cm

TH-42A410T

7.4. Key Button Assembly

NO PART NO QTY UOM DESCRIPTION

01 TBX5ZA03301 1 PC KEY BUTTON BRACKET

02 TZLP42410KA 1 PC LCM ASSY

7.5. Pedestal Assembly

Fix pedestal follow below, need screw first before stick rubber foot.

TH-42A410T

NO QTY UOM DESCRIPTION REMARK

01 1 PC NECK BASE L

02 1 PC NECK BASE R

03 1 PC METAL FRAME

04 1 PC BASE COVER

05 6 PC RUBBER FOOT

06 1 PC RUBBER FOOT

07 1 PC BAG (PEDESTAL)

08 4 PC M4  12 FLAT HEADSCREW 18 ± 2 Kgf.cm

09 4 PC M4  10_FLAT_HEAD_SCREW(BLACK) 08 ± 2 Kgf.cm

TH-42A410T

7.6. Back Cover - Label & Screw

1. Fix back cover and screw.

2. Stick side button label and serial number label.

NO PART NO QTY UOM DESCRIPTION REMARK

01 TBM4GU3151 1 PC SIDE_BUTTON_LABEL

02 THEC1509 7 PC SCREW (BC3/VESA4) 06 ± 1 Kgf.cm

03 THTD037J 17 PC SCREW (BC9/AV3/CRTL1/SP4) 06 ± 1 Kgf.cm

8 Measurements and Adjustments

8.1. Voltage chart of A-board

Set A-Board to a dummy set and check the satisfaction with the specified voltage as following table.

Power Supply Name Measurement Point Specification (V) Remark

SUB1.2V TP8004 1.14 - 1.26 -

SUB3.3V TP8003 3.19 - 3.46 -

SUB5V TP8002 4.92 - 5.25 -

STB5V TP8009 5.3 ± 0.3 -

PNL12V TP4300 11.5 - 12.5 -

8.2. Voltage chart of P-board

Set P-Board to a dummy load and check the satisfaction with the specified voltage as following table.

TH-42A410T

Output Test Point

24V TP7407 <1V 32 ± 1.6V

16V TP7410 <1V 15.7 ± 0.8V

5VS TP7501 5.2 ± 0.2V 5.2 ± 0.2V

PFC TP7201 or TP7202 <340V 390V ± 15V

Step 1 Supply AC 100V/230 to JK7101 connector in the P-Board. Main power button is OFF.

Step 2 TV_SUB_ON P2 connector - pin 8 (TP7416) DC2.5V ON.

Supply DC 2.5V to TV_SUB_ON P2 connector - pin 8 (TP7416), displayed as SWITCH.

NOTE : GND REFERENCE TP7413/TP7414/TP7415/TP7515/TP7516/TP7517 (COLD SIDE)

Step 1 Step 2

Specification

TH-42A410T

Debug

UART

RST

STB5V

24M

1.8/3.3V

RST

PANEL

15V

I2S

HDMI 1

TUNER

HDMI 2 (w/ ARC)

MT5561

DDR2 1G

VIDEO/COMPONENT (automatic detection )

AUDIO

Silicon Lab

Low IF

SUB3.3V

SPI

64/128Mb

Sub3.3V

EEP_WP

EEPROM

64kbit

SLV[A4]

On-board

USB Slot

High-side

switch

USB (side) JK8601

Audio AMP

I2S AMP

RMT/KEY

LED

32” 10W x 2 39”㨪

10W x 2

*&(*&

LVDS

HD : (DATA 4pairs / CLK 1pair)

single8bit

FHD: (DATA 4pairs / CLK 1pair)

dual8bit

Op Amp

IIC

HK/S/A/US/MEX

On board (Si2157 )

YAMAHA (same as MT5307project)

VIDEO

AUDIO

AV2(side) JK3002(Prep)

Audio out JK3000(Prep.)

AV1 JK3100

(HDMI analog audio in)

HDMI1 JK4701

HDMI2 JK4702

CEC

”

Opt. D3051

Demod.

T2/ISDB/DTMB

FOR US/MEX Use MT5560

Chile/Peru

CAN Tuner

AV2 – HK/CHINA only

Audio Out – HK/CHINA only

9 Block Diagram

9.1. Main Block Diagram

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