LG 55LM8600 Service Manual page 45

DVB-S2 LNB Part Allegro
(Option:LNB)
LNB_OUT
C6915 C6916 C6913
18pF 18pF 33pF
LNB
OPT
Close to Tuner
Surge protectioin
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.
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
D6901-*1
LNB_SX34
40V
D6901
LNB_SMAB34
2A
40V
C6901
0.01uF
50V
LNB
C6914 R6906
33pF 2.2K
D6904
1W D6900
LNB
OPT
LNB
LNB MBR230LSFT1G
30V
LNB
C6900
0.22uF
LNB
25V
A_GND
D6903-*1
40V
LNB_SX34
D6903
3A
40V
LNB_SMAB34
C6902 C6912 C6906
1uF
68uF 68uF
50V 35V 35V
LNB
LNB
LNB LNB
L6900
33UH
SP-7850_33
close to Boost pin(#1)
2.4A
DCDC_GND
DCDC_GND
D6902
C6904
LNB_SMAB34
0.1uF
40V
LNB 50V
D6902-*1
LNB_SX34
A_GND 40V
A_GND
BOOST
1
THERMAL
C6903 0.1uF
VCP
2 29
LNB
C6905 22000pF TCAP
3
IC6900
LNB
NC_1
4
A8290SETTR-T
TDO LNB
5
A_GND
EXTM
6
LNB_TX
TDI
7
A_GND
A_GND
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
+12V_LNB
C6911
C6910
0.1uF
10uF
50V
25V close to VIN pin(#25)
LNB
LNB
DCDC_GND
A_GND
NC_8
21
NC_7
20
BFC
19
NC_6
18
NC_5
17 A_GND
NC_4
16
NC_3
15
+3.3V_NORMAL
R6903
4.7K
LNB
LNB
R6904 R6905
0 0
DCDC_GND
A_GND A_GND
Max 1.3A
+12V_LNB
+12V
L6901
BLM18PG121SN1D
C6917 LNB C6918
0.1uF 0.1uF
50V 50V
LNB
LNB
2011.11.21
69
LGE Internal Use Only