55GA7800-CB (CHASSIS:LC37G) - LG TV Service Manual (repair manual). Page 41

THERMAL

THERMAL

THERMAL

THE    SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE    SYMBOL MARK OF THE SCHEMETIC.

1uF

C9817

10V

C9815

10uF

10V

R9811

3.9K

1%

R9810

4.3K

1%

+3.3V_FRC

C9818

560pF

50V

R9809
10K

+1.5V_FRC_DDR

IC9803

AP7173-SPG-13 HF(DIODES)

EAN41406705

3

VCC

2

PG

4

EN

1

IN

5

GND

6

SS

7

FB

8

OUT

9

[EP]

R9812

1K

1%

0.1uF

C9816

16V

C9806
1uF
10V

C9802
10uF
16V

C9804

100pF

50V

L9802

BLM18PG121SN1D

C9810

0.1uF
16V

IC9802

TPS54327DDAR

3

VREG5

2

VFB

4

SS

1

EN

5

GND

6

SW

7

VBST

8

VIN

9

[EP]GND

+12V

C9812
22uF
10V

POWER_ON/OFF2_2

R9806

10K

OPT

+12V

C9801
10uF
16V

R9807

10K

1%

R9805

10K

L9801

BLM18PG121SN1D

C9805
1uF
10V

IC9801

TPS54327DDAR

3

VREG5

2

VFB

4

SS

1

EN

5

GND

6

SW

7

VBST

8

VIN

9

[EP]GND

C9811
22uF
10V

C9809

0.1uF
16V

POWER_ON/OFF2_2

+1.26V_FRC

R9801
6.8K

1%

R9803
1K

1%

R

9

8

0

8

1

2

K

1

%

+3.3V_FRC

R9802
33K

1%

R9804

220

1%

C9813
22uF
10V

OPT

C9807
3300pF
50V

L9803
3.6uH

NR8040T3R6N

C9808
3300pF
50V

L9804
3.6uH

NR8040T3R6N

C9814
22uF
10V

OPT

+3.3V_FRC

R9813

10K

C9821
1uF
10V

R9814

330K
OPT

C9803

27pF

50V

C9819

10uF

16V

C9820

10uF

16V

URSA5 Power Block

LG1152

+1.5V_FRC

+1.5V of DDR&URSA5 uses same power line

Vout=0.6*(1+R1/R2)

TYPICAL 350mA

R2

R1

Vout=0.765*(1+R1/R2)

R2

3A

R1

Switching freq: 700K

R2

Vout=0.765*(1+R1/R2)

R1

3A

Switching freq: 700K

CORE +1.26V_FRC

TYPICAL 980mA

TYPICAL 300mA

+3.3V_FRC

2011. 10. 31