LG 28LN45 Series Service Manual page 32

DVB-S2 LNB Part Allegro
R2706
close to TUNER
0
LNB_OUT
C2714 C2701 C2702
18pF 18pF 33pF
D2701
Close to Tuner
Surge protectioin
Caution!! need isolated GND
R2701
0
A_GND
Max 1.3A
+12V_Normal
+12V_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
30V
C2703 C2704 C2705
0.01uF 10uF 10uF
50V 25V 25V
close to Boost pin(#1)
D2702
MBR230LSFT1G
30V
D2704
C2712
LNB_SMAB34
0.1uF
R2702
C2713 50V 40V
2.2K
0.22uF
1W 25V
D2704-*1
(OPT)LNB_SX34
40V
A_GND
A_GND
3A
+12V_LNB
D2705-*1
Max 1.3A
40V
(OPT)LNB_SX34
3.5A
SMAB34 D2705
40V
LNB_SMAB34
C2708
10uF
25V
C2706
10uF
25V
A_GND
A_GND
close to VIN pin(#15)
C2709
A_GND
0.1uF
50V
VCP VIN
1 15
THERMAL
LNB GND
2 21 14
NC_1 VREG
3 13
IC2701
TDI A8303SESTR-T ISET
4 12
TDO TCAP C2710
5 11
0.1uF
Input trace widths should be sized to conduct at least 3A
Ouput trace widths should be sized to conduct at least 2A
R2703
36K
1/16W
1%
NC4_S7LRM
LNB
EAX65303801
2013.1.14
27 13
LGE Internal Use Only