Panasonic Viera TH-32A400G Guida rapida

Panasonic Corporation 2014

Unauthorized copying and distribution is

a violation of law.

Hints for Board Repair

( 32inch, 1 board model )

Order No. ITD1412904GE

Model No.

Ver. 1.0

TH-32A400G/K/T/X/V

TH-32A405D

TH-32A408K

TH-32A409K

TH-32A410D/G/K/M/X/V

IC8001 RTD2644

Video

I/F

Digital Video

Processor

Resize MIX

I/P conv.

Pixel conv.

AI Gamma

OSD

AMP

IC4900

(V)

(Y Pb Pr)

A12

Demod

SPI

ROM

IC8901

A10

USB

HDMI

Audio

I/F

Signal Flow

(TNP4G573**)

Component

Video

A21

LED/

Remote

(K Board)

DEMOD

IC6750

Antenna

EEPROM

IC8902

(IF)

Troubleshoot of Picture Problem

<LCD Panel Test Mode> :

When abnormal picture is displayed, troubleshoot by the test pattern in LCD module.

If the picture is no problem, A board must be defective.

If the picture is also abnormal, LCD panel module must be defective.

How to enter :

While pressing "volume(-)" button of the TV unit,

press "option" button of the remote control 3 times within 2 seconds.

How to exit :

Disconnect AC plug

IC8001

(RTK2644)

Resize

IP conv.

LCD Panel

LCD Panel Module

T-CON

Test

Pattern

#) The test pattern is created by the circuit

in LCD Panel Module(T-CON board).

Yes

Is the picture of all

Input Source NG ?

Check by LCD

Panel Test Mode

Check the input circuit / IC8001

LCD Panel

IC 8001

LCD Panel

Module

(LED

Backlight)

Power Supply Part

IC7503

IC7301

Start

Vcc 5

T7301

Q7301

D7303

R7342

-44

16V

PC7301

feedback 10

STB5.3V

IC7501

VCC

DRV

Q7510

P16.3V

SUB-ON

VCC

Q7502

D7507

C7502

D7502

C7512

LED

Drive

IC7800

BL-ON(Hi=enable)

Q7801

L7806/07

Anode

Cathode

Vcc

Panel-PWM

Q7803

Panel-PWM

Bright

Dark

Lighting Period OFF

D7102

Rectifier

14 BL-SOS

(1 blink)

SUB3.3V

Power Supply Distribution (1/2)

(TNP4G573**)

L7502

D7317

C7513

CF7101

F7101

OFF/STB=38V

ON= 71V

1st

2nd

3rd

6th

7th

13th

14th

15th

(2nd)

1-3 5-8

D7800

C7817

38V

IC7301 automatically starts working after AC plug in. (always working from to )

IC7800 starts working after input Vcc and BL-ON/Panel-PWM signal.

4th1st

14th

VLED

The power on sequence is describe by the number of the symbol. ( - )

1st 15th

2nd

Signal Processing Part

RTD2644

IC8001

A10

P16.3V

LED

Remote

DCDCEN

X8301

Power Supply Distribution (2/2)

SUB3.3V

Power

_SW

PANEL12V_ON

P16.3V

TUNER

IC6750

8 21

X6750

3.3V

IC8708

STB5.3V/STB5V

V33A/V33HDMI/V33POR

SUB5V

IC8702 L8702

DCDCEN2

SUB3.3V

3.3V

IC8711

TNR3.3V/SITU_3.3V

3.3V

IC8709

TNR1.8V/SITU_1.8V

1.8V

IC8705

DDR1.8V/DDRV

1.8V

IC8707

SPI

IC8901

EEPROM

IC8902

(TNP4G573**)

STB3.3V/STB_M3.3V/V33AMAIN/ETN_3V3/V33IO/V33LVDS

USB_Pwr

IC5602

JK8601

USB

1 6

AMP

IC4900

A21 To LCD

Module

(T-CON)

27-30

12V

IC8300

PNL12V

L8300

PANEL12V_ON

VCCK1.1V/V11CORE

1.1V

IC8700 L8700

Tr x2

Q8002

KEY3

122

SUB-ON

110

BL-ON / Panel-PWM

STBRST

131

BL-SOS (1 blink)

3rd

4th

6th

7th 8th

9th

11th

13th

12th

10th

Remote

5th

All OK

No or

Low voltage

No Power/No Operation

< symptom >

No signal = IC8001

No P16.3V = Q7502/D7502

Troubleshoot of Power On Problem (1/2)

Check output voltage of

STB5V, STB3.3V

Check TV_SUB_ON signal (=High)

and voltage P16.3V line

Power IC of Defective line

Check short circuit of each power line

SUB5V,SUB3.3V,DDR1.8V,VCCK1.1V

(PNL12V,TNR3.3V,TNR1.8V)

F7101/CF7101

Q7301/IC7301/D7317,

D7502/IC7503

IC7503/IC8708

(check short circuit of STB power line)

Check input voltage of

IC7503 (16V) and

Check VLED voltage (38V)

at P2-3pin

If all output voltages are OK,

IC8001

Check by power on sequence ( from to )

1st 13th

3rd 4th 2nd

6th 7th

8th 9th

SOS 1 blink

Q7801,7803

(IC7800)

Shorted

< symptom >

Troubleshoot of Power On Problem (2/2)

Check short circuit of

Q7801,7803

Voltage Check of VLED

Just before shutdown

(rise up from 38V to 71V)

IC7800

Keep 0V

Rise up

(Not 0V)

Voltage Check of PWM

Signal input (pin4) of C7800

Just before shutdown

IC8001

(71V)

(38V or lower)

LCD Panel

Parts Change Note

1. Add zener diode (DZ2J068M0L) to pad of C8759 (no use)

POLARITY MARKING

2. Add surge absorber (D4EDY5R5A038) to pad of C8782 (no use)

3. Add surge absorber (D4EDY5R5A038) to pad of C8707 (no use)

Parts Location

Q7502

IC7301

F7101

CF7101

Q7301

D7507

D7102

D7502

IC7503(STB5V)

IC7800

Q7801

Q7803

Q7510

D7800

A10

IC8708 (STB3.3V)

L8700 (Left side=VCCJ1.1V)

L8702 (Left side=SUB5V)

L8300 (Left side=PNL12V)

A21

IC8707 (DDR1.8V)

IC8711 (SUB3.3V)

IC8705 (TNR1.8V)

IC8709 (TNR3.3V)

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