LG 77EG9700 Service Manual page 52

DVB-S2 LNB Part Allegro
(Option:LNB)
LNB_OUT
C6900 C6901
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 right reserved.
Only for training and service purposes
2A
D6902-*1
LNB_DIODE_TSC
30V
D6902
LNB_DIODE_ONSEMI
30V
C6903 C6905
0.01uF 10uF
50V 25V
LNB LNB
close to Boost pin(#1)
D6901-*1
SS23L
30V
LNB_DIODE_TSC
D6901
MBR230LSFT1G
30V
D6903
C6904
LNB_DIODE_ONSEMI
LNB_SMAB34
0.1uF
R6900
40V
LNB 50V
2.2K
D6900 1W
C6902
LNB LNB 0.22uF
LNB
25V D6903-*1
LNB_SX34
40V
A_GND
A_GND
3A
+12V
D6904-*1
Max 1.3A
40V
LNB_SX34
3.5A
D6904
40V
LNB_SMAB34
C6906 C6907
10uF 10uF
25V 25V
LNB LNB
A_GND
A_GND
A_GND
VCP VIN
1 15
THERMAL
LNB GND
2 14
21
NC_1 VREG
3 13
IC6900
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
C6909
10uF
25V
LNB
close to VIN pin(#15) Caution!! need isolated GND
R6904
0
C6910
0.1uF
50V
LNB
A_GND
LNB
R6903
39K
1/16W
C6912
1%
LNB
0.1uF
LNB
BSD-14Y-UD-069-HD
2013.12.17
69
LGE Internal Use Only