LG 50PM4700 Service Manual page 24

DVB-S2 LNB Part_Allegro
LNB_OUT
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 © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
S
D1201
D1203
SMAB34
SMAB34 S
40V 40V
2A
S S S
S
C1201 C1202 C1208
C1203
1uF 68uF 0.01uF
68uF
50V 35V 35V 50V
close to Boost pin(#1)
DCDC_GND
DCDC_GND
D1200
MBR230LSFT1G
S
30V
D1202
C1204
S SMAB34
0.1uF 40V
C1200
50V
0.22uF
S
25V
A_GND
A_GND
A_GND
BOOST
1
THERMAL
C1205
VCP
2 29
0.1uF C1207
TCAP
3
22000pF
NC_1
4
A8290SETTR-T
TDO
5
A_GND
EXTM
6
LNB_TX
TDI
7
R1200 R1201
0 S 0 S
A_GND DCDC_GND
A_GND A_GND
3A
+12V_LNB
L1200
S
33UH
SP-7850_33 C1212 C1213
10uF 0.1uF
2.4A
50V
S
16V
close to VIN pin(#25)
DCDC_GND
A_GND
DCDC_GND and A_GND are connected
DCDC_GND and A_GND are connected in pin#27
PCB_GND and A_GND are connected
NC_8
21
NC_7
20
BFC
19
IC1200
NC_6
18
S NC_5
17 A_GND
NC_4
16
NC_3
15
+3.3V_MULTI
S
R1205
4.7K
OPT
LGE Internal Use Only