LG 50LN54 Series Service Manual page 33

DVB-S2 LNB Part Allegro
(Option:LNB)
R2706
close to TUNER
0
LNB_OUT
C2714 C2701 C2702
18pF 18pF 33pF
D2701
LNB LNB LNB
LNB
Close to Tuner
Surge protectioin
Caution!! need isolated GND
R2701
0
A_GND
Max 1.3A
+12V
+12V_LNB
LNB
L2701
BLM18PG121SN1D
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 © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2A
D2703
LNB
30V
C2704 C2705
C2703
0.01uF 10uF 10uF
50V 25V 25V
LNB LNB LNB
close to Boost pin(#1)
D2702
MBR230LSFT1G
30V
LNB D2704
C2712
LNB_SMAB34
0.1uF
R2702
40V
C2713 LNB 50V
2.2K
0.22uF
LNB
1W 25V
LNB
D2704-*1
LNB_SX34
40V
A_GND
A_GND
3A
+12V_LNB
D2705-*1
Max 1.3A
40V
LNB_SX34
3.5A
D2705
40V
LNB_SMAB34
C2708
10uF
25V
C2706
10uF LNB
25V
LNB
A_GND
A_GND
close to VIN pin(#15)
C2709
A_GND
0.1uF
50V
LNB
VCP VIN
1 15
THERMAL
LNB GND
2 21 14
NC_1 VREG
3 13
IC2701
TDI ISET
A8303SESTR-T
4 12
LNB
TDO TCAP C2710
5 11
Input trace widths should be sized to conduct at least 3A
Ouput trace widths should be sized to conduct at least 2A
LNB
R2703
36K
1/16W
1%
LNB
0.1uF
NC4_S7LRM
LNB
2012/06/19
27
LGE Internal Use Only