Panasonic TH-L42U5D Manuale utente

©Panasonic Corporation 2012.

Unauthorized copying and distribution is a

violation of law.

ORDER NO.PAVCI1206036CE

LCD TV

Model No. TH-L42U5D

CONTENTS

1. Safety precautions .................................................................................................3

2. Alignment instructions and method of software upgrading.....................................5

3. Working principle analysis of the unit ...................................................................15

4. Specifications.......................................................................................................16

5. Block diagram ......................................................................................................17

6. Wiring diagram ...................................................................................................20

7. Troubleshooting guide..........................................................................................25

8. Exploded View .....................................................................................................29

9. Replacement Parts List........................................................................................31

10. Boards Layout....................................................................................................32

11. Disassembly and Assembly Instructions............................................................33

Attention:

This

service

manual

only

for

service

personnel

take

reference

with. Before servicing

please

read

the

following

points

carefully.

Safety

precautions

1. Instructions

sure

switch

off

the

power

supply

before

replacing

welding

any

components

inserting/plugging

connection

wire

Anti

static

measures

taken

(throughout

the

entire production

process!):

not

touch

here

and

there

hand

will;

sure

use

anti

static

electric

iron;

It’s

must

for

the

welder

wear

anti

static

gloves.

Please

refer

the

detailed

list

before

replacing

components

that

have

special

safety

requirements.

not

change

the

specs

and

type

will.

2. Points for attention in servicing of LCD

2.1

Screens

are

different

from

one

model

another

and

therefore

not

interchangeable.

sure

Use

the

screen

the

original

model

for

replacement.

2.2

The

operation

voltage

LCD

screen

high voltage

sure

take

proper

measures

protecting

yourself

and

the

machine

when

testing

the

system

the

course

normal

operation

right

after

the

power

switched

off.

Please

not

touch

the

circuit

the

metal

part

the

module

That

operation

mode.

Relevant

operation

possible

only

one

minute

after

the

power

is switched

off.

2.3

not

use

any

adapter

that

not

identical

with

the

set.

Otherwise

will

cause

fire

or damage

the

set.

2.4

Never

operate

the

set

any

installation

work

bad

environment

such

wet

bathroom,

laundry,

kitchen,

nearby

fire

source,

heating

equipment

and

devices

exposure

sunlight

etc.

Otherwise

bad

effect

will

result.

2.5

any

foreign

substance

such

water,

liquid,

metal

slices

other

matters

happens

fall

into the

module,

sure

cut

the

power

off

immediately

and

not

move

anything

the

module

lest

it should

cause

fire

electric

shock

due

contact

with

the

high

voltage

short

circuit.

2.6

Should

there

smoke,

abnormal

smell

sound

from

the

module,

please

shut

the

power

off

once.

Likewise,

the

screen

not

working

after

the

power

the

course

operation,

the

power

must

cut

off

immediately

and

operation

allowed

under

the

same

condition.

2.7

not

pull

out

plug

the

connection

wire

when

the

module

operation

just

after

the

power

off

because

this

case

relatively

high

voltage

still

remains

the

capacitor

the

driving

circuit.

Please

wait

least

one

minute

before

the

pulling

out

plugging

the

connection

wire.

2.8

When

operating

installing

LCD

please

don’t

subject

the

LCD

components

bending,

twisting or

extrusion,

collision

lest

mishap

should

result.

2.9

most

the

circuitry

LCD

set

composed

CMOS

integrated

circuits,

it’s

necessary to

pay

attention

anti

statics.

Before

servicing

LCD

make

sure

take

anti

static

measure

and

ensure

full

grounding

for

all

the

parts

that

have

grounded.

2.10

There

are

lots

connection

wires

between

parts

behind

the

LCD

screen.

When

servicing

moving

the

set

please

take

care

not

touch

scratch

them.

Once

they

are

damaged

the

screen

would

unable

work

and

way

get

repaired.

the

connection

wires,

connections

components

fixed

the

thermo tropic

glue

need

to disengage

when

service,

please

soak

the

thermo tropic

glue

into

the

alcohol

and

then

pull

them

out in

case

damage.

2.11

Special

care

must

taken

transporting

handling

it.

Exquisite

shock

vibration

may

lead

breakage

screen

glass

damage

driving

circuit.

Therefore

must

packed

strong

case

before

the

transportation

handling.

2.12

For

the

storage

make

sure

put

place

where

the

environment

can

controlled

prevent

the

temperature

and

humidity

from

exceeding

the

limits

specified

the

manual.

For

prolonged

storage,

necessary

house

anti-moisture

bag

and

put

them

altogether

one

place.

The

ambient

conditions

are

tabulated

follows:

Temperature

Scope

for

operation

~ + 35

Scope

for

storage

+ 60o

Humidity

Scope

for

operation

20%

Scope

for

storage

90%

2.13

Display

fixed

picture

for

long

time

may

result

appearance

picture

residue

the

screen,

commonly

called

“ghost

shadow”.

The

extent

the

residual

picture

varies

with

the maker

LCD

screen.

This

phenomenon

doesn’t

represent

failure.

This

“ghost

shadow”

may

remain

the

picture

for

period

time

(several

minutes).

But

when

operating

please

avoid

displaying still

picture

high

brightness

for

long

time.

3. Points for attention during installation

3.1

The

front

panel

LCD

screen

glass.

When

installing

please

make

sure

put

place.

3.2

For

service

installation

it’s

necessary

use

specified

screw

lest

should

damage

the

screen.

3.3

sure

take

anti

dust

measures.

Any

foreign

substance

that

happens

fall

down

between the

screen

and

the

glass

will

affect

the

receiving

and

viewing

effect

3.4

When

dismantling

mounting

the

protective

partition

plate

that

used

for

anti

vibration

and

insulation

please

take

care

keep

intactness

avoid

hidden

trouble.

3.5

sure

protect

the

cabinet

from

damage

scratch

during

service,

dismantling

mounting.

2. Alignment

instructions

(1) Test equipment

VG-859

(YPbPr, VGA, HDMI

signal

generator)

CA210

(white

balancer)

(2) Power test

Connect

main board,

power

board

and

board

according

the

wiring

diagram,

connect

the

power

and

press

power key (Remote controller or Keypad)

button

turn

the

TV.

a) Test

the

voltage

P802/power board ,

the

data

shown

table1:

Table1

voltage

data

P802

For 42”

P802 Pin1,2 Pin3,4 Pin5,6,7

Pin8,9 Pin10,11

Voltage GND 11.4V~12.6V GND 11.4V~12.6V 4.75V~5.25V

For 42”

Pin12 Pin13 Pin 14 Pin15 Pin16

On:2.5V-5.25V

Off: 0-0.5V

Normal:0V~0.5V

Abnormal :Open drain

On:2.5V-5.25V

Off: 0-0.5V Duty 20%~100% NC

(3) Alignment flow-chart

The

alignment

flow-chart

shown

fig-1

Check if DDC, HDCP KEY, FLASH are written

Combined test for general assembly

White balance adjustment

Connect to the center signal source and check each

Function of TV (station leaking, analog control, etc.)

Check the output of earphone and speaker.

Input AV signal and check the function

Input HD signal and check the function of YPbPr

Input VGA signal and check if the display is normal, check

the function (analog control), horizontal/vertical center, etc.

Input USB signal and check if the display is normal, check

the function (analog control), horizontal/vertical center, etc.

Input HDMI signal and check if the display is normal, check

the function (analog control), horizontal/vertical center, etc.

Preset ex-factory

Check the accessories and packing

Fig-1

adjustment

flow-chart

(4) Adjustment instruction

At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode .

During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode.

4-1. Source Calibration

4-1.1. Set the signal generator to input sources Component on LCD-TV;

Signal Format : 720P@60Hz Component 100%Color Bar

Instrument (Recommend) : Astro VG-859 / timing PG2 940

Signal analog level

4-1.2. Entering factory Mode: Press up or down key of remote control to select “Auto Calibration”, Press 「OK」

key to enter the item.

-> Source calibration performed automatically, and “OK” info. will pop up after finished.

Repeat step 2 to do VGA input sources,

Signal Format : VGA 1024x768@60Hz

Instrument (Recommend) : Astro VG-859 / timing PG2 963

4-2. Color Temperature Adjustment & Check

4-2.1. Set below items

4-2.3. Adjustment color temperature are min. / typ. / max.

1. Fixed the G Gain and G Offset, adjusts the R Gain, B Gain, R offset, B offset.

4-2.4. Exit Factory Mode:

After finish adjusting color temperature then press [MENU] or [RETURN] to back factory mode.

Press [EXIT] to exit factory mode.

4-2.2. Press up or down key of remote control to select “Cool”, Press 「ENTER」 key to enter the item.

RGAIN, GGAIN, BGAIN, ROFFSET, GOFFSET, BOFFSET, drive values are set for Warm, Normal,

and Cool independently.

2. If R Gain、B Gain and R offset、B offset value are larger the specification, duly change in G Gain or G

Offset at a time , after follow adjustment step 1.

(5) Items of Factory menu

At any input source press the Mute(keep pressing) of Remote control and “Menu” (key pad) to enter factory mode .

During Factory menu, if “EXIT” key of Remote control is pushed, system will exit factory mode.

Press the up and down key to move high light item from Color Temperature -> Shipping -> NV Clear-> Full Power

-> Auto Calibration -> RF Burn In -> Debug ->Reset -> SoftWare Update(USB) ->Panel Gamma Control.

The NVRAM Clear and Reset to Default items will have a dialog “yes or no” to confirm the action.

Press “Enter” key to select high light item function. (Press left and right to adjust value)

1) Factory Color Temp data edit

Press up or down key to select high light item function

Press enter key to enter the item.

-Color temp default preset No (Warm, Medium, Cool).

-R, G, B data for each preset

Press “Up” or “Down” key to select “R”, “G”, “B” item

Press “Left” or “Right” key to set the “R”, “G”, “B” value

Press “MENU” or “EXIT” item to exit to factory mode

2) Shipping

Select the shipping area to “India” then do "Factory Reset "

After the actions are done, plug out the AC power.

3) NV CLEAR

Initializes TV setting to default values

- Reset settings: Gamma table, Channel table, Model table (H/V Position, Clock, Phase), Source

dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), OSD

( Picture , Sound , Setup).

This item will have a dialog “yes or no” to confirm the action.

4) Full power

This is for power consumption test.

To measure the maximum power consumption of TV set, we adjust the value of following items to

maximum.

- Video:

Contrast maximum value, Brightness maximum value, Backlight maximum value.

- Audio: Volume maximum value, Bass default value, Treble default value.

Select on/off by left/right key and press Enter key to turn on/off the Full power function.

5) Auto Calibration

Source Calibration (gain/offset) must be adjusted by specific pattern, for VGA, Composite and

Component input source.

This item will have a result dialog “OK” or “NG”.

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