LG 55UB820T Service Manual page 40

DVB-S2 LNB Part Allegro
(Option:LNB)
LNB_OUT
C1800 C1801
18pF 33pF
LNB LNB
Close to Tuner
Surge protectioin
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright © 2014 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2A
D1802-*1
SS23L
30V
DIODE_SS23L
D1802
DIODE_ONSEMI
30V
C1803 C1805
0.01uF 10uF
50V 25V
LNB LNB
close to Boost pin(#1)
30V
SS23L
D1801-*1
DIODE_SS23L
D1801
MBR230LSFT1G
30V
D1803
C1804
DIODE_ONSEMI
LNB_SMAB34
0.1uF
R1800
40V
50V
LNB
2.2K
D1800 1W
C1802
LNB LNB 0.22uF
LNB
25V D1803-*1
LNB_SX34
40V
A_GND
A_GND
3A
+12V
D1804-*1
Max 1.3A
40V
LNB_SX34
3.5A
D1804
40V
LNB_SMAB34
C1806 C1807
10uF 10uF
25V 25V
LNB LNB
A_GND
A_GND
A_GND
VCP VIN
1 15
THERMAL
LNB GND
2 14
21
NC_1 EAN62653701 VREG
3 13
IC1800
TDI A8303SESTR-T ISET
4 12
LNB
TDO TCAP
5 11
Input trace widths should be sized to conduct at least 3A
Ouput trace widths should be sized to conduct at least 2A
C1809
10uF
25V
LNB
close to VIN pin(#15) Caution!! need isolated GND
R1804
C1810
0
0.1uF
50V
LNB
A_GND
LNB
R1803
39K
1/16W
C1812
1%
LNB
0.1uF
UB83
LNB
2013-10-28
18
LGE Internal Use Only