LG 42GA6400-UD Service Manual page 41

DVB-S2 LNB Part Allegro
(Option:LNB)
LNB_OUT
C6900 C6901
18pF 33pF
D6900
LNB LNB
LNB
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 ⓒ 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2A
D6902
LNB
30V
C6903 C6905 C6906
0.01uF 10uF 10uF
50V 25V 25V
LNB LNB LNB
close to Boost pin(#1)
A_GND
D6901
MBR230LSFT1G
30V
D6903
C6904
LNB
LNB_SMAB34
0.1uF
R6900
40V
LNB 50V
2.2K
1W
C6902
LNB 0.22uF
LNB D6903-*1
25V
LNB_SX34
40V
A_GND
A_GND
3A
+12V
D6904-*1
Max 1.3A
40V
LNB_SX34
2.4A
D6904
SIGN1100135
40V
LNB_SMAB34
C6909
10uF
C6907 25V
10uF
LNB
25V
LNB
A_GND
A_GND
close to VIN pin(#15)
C6910
0.1uF
50V
LNB
VCP VIN
1 15
THERMAL
LNB GND
2 14
21
NC_1 VREG
3 13
IC6900
TDI ISET
A8303SESTR-T
4 12
DEV_LNB_A8303
SIGN1100142
TDO TCAP C6912
5 11
LNB
0.1uF
SIGN1100137
Input trace widths should be sized to conduct at least 3A
Ouput trace widths should be sized to conduct at least 2A
Caution!! need isolated GND
R6904
0
A_GND
LNB
R6903
36K
1/16W
1%
LNB
2011.11.21
69
LGE Internal Use Only