LG Electronics 32LM640S/640T-ZA OptionLNB, DVB-S2 LNB Part Allegro, PCBGND and AGND are connected

DVB-S2 LNB Part Allegro

(Option:LNB)

D6901-*1

LNB_SX34	D6903-*1
40V	40V
	LNB_SX34
D6901	D6903
LNB_SMAB34

DCDC_GND and A_GND are connected

DCDC_GND and A_GND are connected in pin#27

PCB_GND and A_GND are connected

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

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

LNB_OUT

C6915	C6916	C6913	C6914
18pF	18pF	33pF	33pF	D6904

2A

R6906

2.2K

40V					40V
					LNB_SMAB34
C6901		C6902	C6912	C6906
0.01uF		1uF	68uF	68uF
50V		50V	35V	35V
LNB		LNB	LNB	LNB
	close to		Boost pin(#1)
				DCDC_GND
					DCDC_GND

3A

+12V_LNB
LNB
L6900
33UH		C6911
SP-7850_33	C6910
2.4A	10uF	0.1uF
		50V	close to VIN pin(#25)
	25V
	LNB	LNB

OPT	LNB	OPT	LNB	LNB
	Close	to Tuner
	Surge	protectioin

1WD6900

LNB MBR230LSFT1G

30V LNB

C6900

0.22uF

LNB 25V

	C6904		D6902
	0.1uF		LNB_SMAB34
			40V
LNB	50V
		D6902-*1
	A_GND	LNB_SX34		[EP]		GNDLX
			40V		LNB
			A_GND

DCDC_GND

LX VIN BFI NC 9 BFO

A_GND

A_GND

				BOOST		28	27	26	25	24	23	22
						1
C6903 0.1uF					VCP	THERMAL
						2	29
LNB		C6905 22000pF TCAP				3
								IC6900
			LNB		NC_1	4
							A8290SETTR-T
					TDO
	A_GND					5			LNB

EXTM 6

LNB_TX

	TDI	7
		8	9	10		11		12	13	14
A_GND		GND	VREG	SDA		ADD		SCL	NC 2	IRQ
				33				33
					LNB				C6909 LNB
			C69070.22uF	R6900			OPT	R6901		OPT
				LNB	C690827pF
									27pF

A_GND

I2C SDA4 I2C SCL4

21NC_8

20NC_7

19BFC

18 NC_6

17 NC_5 A_GND

16NC_4

15NC_3

+3.3V_NORMAL

R6903

4.7K LNB

R6904	R6905
0	0
A_GND	DCDC_GND
	A_GND

Max 1.3A

+12V+12V_LNB

L6901

BLM18PG121SN1D

C6917	LNB	C6918
0.1uF		0.1uF
50V		50V
LNB		LNB

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.

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Only for training and service purposes

LNB 2011.11.21

69

LGE Internal Use Only