42LW5500-ZE, 42LW550T-ZE, 42LW550W-ZE, 42LW551C-ZE, 42LW5590-ZE (CHASSIS:LD12C) - LG TV Service Manual (repair manual). Page 38

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.

R2302

33

LNB

LNB_TX

L2301

33UH

SP-7850_33

LNB

C2324

68uF

35V

LNB

C2303
0.1uF
50V

LNB

R2303

0

LNB

+3.3V_Normal

C2304 0.1uF

LNB

SCL1_3.3V

C2305

68uF

35V

LNB

D2301

40V

SMAB34

LNB

C2310

27pF

OPT

DCDC_GND

L2302

BLM18PG121SN1D

LNB

A_GND

LNB_OUT

C2308

0.22uF

LNB

+12V

+12V_LNB

D2304

40V

SMAB34

LNB

A_GND

DCDC_GND

C2312
0.1uF
50V

LNB

A_GND

A_GND

A_GND

D2303

40V

SMAB34

LNB

R2314

0

LNB

C2309

27pF

OPT

DCDC_GND

R2313

0

LNB

+12V_LNB

A_GND

A_GND

A_GND

C2311
10uF
25V

LNB

R2301

33

LNB

C2307

0.01uF

50V

LNB

SDA1_3.3V

C2302

1uF
50V

LNB

LNB_INT

R2304

4.7K

LNB

DCDC_GND

A_GND

C2306

22000pF

LNB

C2301

0.22uF

25V

IC2301

A8290SETTR-T

LNB

1

BOOST

3

TCAP

7

TDI

9

VREG

10

SDA

11

ADD

12

SCL

13

NC_2

14

IRQ

15

NC_3

16

NC_4

17

NC_5

18

NC_6

19

BFC

20

NC_7

21

NC_8

22

BFO

23

NC_9

24

BFI

25

VIN

26

LX

27

GNDLX

28

LNB

5

TDO

8

GND

6

EXTM

4

NC_1

2

VCP

29

[EP]

D2302

1000V

US1M(suzhou)

LNB

DCDC_GND and A_GND are connected in pin#27

LNB

Input trace widths should be sized to conduct at least 3A

close to Boost pin(#1)

57

DVB-S2 LNB Part Allegro

23

close to VIN pin(#25)

2A

DCDC_GND and A_GND are connected

3A

Ouput trace widths should be sized to conduct at least 2A

BCM35230

2.4A

Max 1.3A

(Option:LNB)

PCB_GND and A_GND are connected

2010.11.02