Panasonic TH-42PX500UA, Service Manual

5.2. P-Board Block Diagram

-

+

-

+

+

+

D510

D509

X501
4NHz

Q527

D534

D536

R661

1

2

3

D545

D544

D542

D521

VR352

1

2

3

D535

PR509

D532

D531

D530

D568

Q409

Q408

Q413

Q412

D417

D420

D419

C467

D404

D462

D511

PR501

D444

D401

D505

D555

D563

R544

D567

PR503

R671

VR351

C555

C446

R443

1

2

3

L506

D529

D528

1

2

IC408

4

2

1

3

1

3

4

2

1

3

4

2

IC404

IC403

3

9

8

14

4

2

16

10

T401

5

8

7

6

VCC

MOS

DRIVE

CURR

DET

CURR
COMP

2

1

3

4

Q407

Q420

Q404
Q406
R406
D415

IC406

POWER

FACTOR

CORRECTOR

5

4

9

2

10

6

T402

Q535

8

6

10

7

9

2

3

4

1

15

19

24

18

22

23

16

17

21

20

VDD

VSS

XIN

XOUT

RESET

STB PS

PFC DET

F STB PC
ON/OFF

DISCHARGE

ECO ON/OFF

F STB ON/OFF

V LOW DET

AC P DET

TV ON/OFF

VSUS DET

STB ON/OFF

PS SOS

PFC ON/OFF

V LOW ON/OFF

IC501

1

3

IC502

RESET

1

5

2

4

6

3

T407

9

8

11

3

15

2

6

4

1

IC512

1

4

Vda

P12

+15V

+12V

TO

1

2

6

PB5

P5

+12V

+12Vs

4

+15V

+12Vs

7

+12Vs

8

1

+15V

2

+15V

P23

TO
SC23

9

+5V

TO

STB5V

7

P25

D25

+5V

10

Q421

POWER MCU

COLD

COLD

HOT

10

STB_PS

4

1

5

3

IC402

Q422

7

8

STB12V

DC15V(V15)

DC12V(V12)

Q509

PB30

+15V

FAN SOS

5

4

3

P30

+5V

TO

FAN CONT

1

14

FAN SOS

Q550

Q557

2

3

1

16

17

15

18

12V

2

12V

3

1

FAN CONT

Q552

3

HOT

P

POWER SUPPLY

4

Vda

Q508

13

14

PR601

9

6

5

4

3

5

ZCD

7

GD

8

VCC

1

3

VFF

4

CS

INV

Q507
Q506

IC509

13

14

12

MAIN RELAY

RUSH RELAY

VSUS

ON/OFF

ALL OFF

11

Q561

Q559

13

F STBY ON

IC507

1

5

REG

Q544

ALL OFF

PS SOS

PANEL MAIN ON

ECO_ON

Q567

Q518

Q519

F STB 14V

2

1

3

F STB 14V

F STB 14V

P10

TO

PA10

12

16

15

13

2

4

6

IC520

5

PR401

PR402

Q401

4

7

8

5

3

2

1

Q435

Q423

R903-R906
R928-R931
Q424,Q434.Q436

L405

L404

F401

F402

1

4

NEUTRAL

RL402

RL403

R455,R474
R479,R481
R483,R488
Q430,Q432

Q433,Q441

Q417

IC407

Q438

Q431
Q439

Q440

4

2

4

2

IC409

3

1

1

3

3

14

13

10

18

9

6

15

16

SS12

TO

T601

REG

IC504

2

1

T410

T404

D539

LIVE

P9

2

ERROR DET

POWER

DC POWER 

ERROR DET

COMPARATOR(PFC DET)

+5V REG

COLD

HOT

AC CORD

TO

PFC DET

STB5V DET

ALLOFF SW

EXT

Isen

VIN

CE/SS

CLK

FB

VSS

VlOW DET

VlOW DET

MAIN ON/OFF

RUSH ON/OFF

INV.

Vlow

Vlow POWER CIRCUIT

Vsus POWER CURCIUT

INV.

INV.

OSC

OSC

F STB 14V

D418

R464

R472

R473

R465

R496

R495

R494

Q418

R497

(350V

40V)

PFC OUT

IC411

1

4

COMPARATOR(AC IN)

5

3

Q4O3

L403

Q503

Q501

Q502

Q551

Q505

R622

R648

R636

R626

R656

ERROR DET(Vsus)

IC506

1

3

REG

ERROR DET

IC503

1

2

REG

SW

Q553

Q554

SW

SW

Q560

Q564

Q558

Q562

INV

SW

Q565

ON:L

STB
OVER
VOLTAGE
PROTECTION
(8V

2V)

Q414

Q415

CONTROL

AC IN

(66.5V

3V)

DETECTION

Q511

Q512

H:ON

Q538

STB 5V ON

Q537

SW

2

Vda

73V

D569

D570

D571

R670

Q510,Q516

Q541

R650

R649

5V OUT
DETECTION

COUPLER

PHOTO

IC412

COUPLER

PHOTO

CONTROL

D579

R579

D549

R666

D551

R545

(16V

2V)

3

4

1

2

IC505

IC401

COUPLER

PHOTO
COUPLER

DC-DC

CONVERTER

Csus

Q530
Q525

R533

(3V

1.0V)

178V

(1.7A)

R627

Vsus

R526

R527

H:ON

Vdat OVER VOLTAGE
DETECTION(100V

25V)

VSUS OUT
DETECTION
(60V

40V)

OVER
VOLTAGE
PROTECTION
(490V

80V)

COUPLER

PHOTO

COUPLER

PHOTO

PHOTO

OVER
VOLTAGE
DETECTION
(490V

80V)

(Vda)

DETECTION

12V OVER
VOLTAGE

(16V

2V)

PROTECTION

INV.

COUPLER

PHOTO

SC2

TO

Vsus

1

2

TO

2

Vsus

P11

P2

Vsus

Vsus

SS11

3

SW

Q536

PFC

D427

D428

R444

R475

R441

R442

D435 D467

D441

1

R921

D552

Q517

Q520

R620

R589

R590

R621

R534

D574

D588

D572

OSC

OSC

Vda 70V

Vsus 188V(0.6A)

395V

395V

TH-42PX50U, TH-42PX500U
P-Board Block Diagram

TH-42PX50U, TH-42PX500U
P-Board Block Diagram

TH-42PX50U / TH-42PX500U

14