LG 37LV470S Service Manual page 24

DVB-S2 LNB Part Allegro
(Option:LNB)
D2301
LNB SMAB34
2A
40V
C2307 C2302
0.01uF 1uF
50V 50V
LNB LNB
close to Boost pin(#1)
D2302
US1M(suzhou)
LNB_OUT
1000V
LNB
C2301
0.22uF
25V
A_GND
LNB_TX
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 © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
D2304
SMAB34
3A
40V
LNB
+12V_LNB
C2324 C2305
68uF 68uF
35V 35V
LNB
LNB LNB
L2301
33UH
SP-7850_33
2.4A
DCDC_GND
DCDC_GND
D2303
C2303
SMAB34
0.1uF
40V
50V
LNB LNB
A_GND
A_GND
BOOST NC_8
1 21
THERMAL
C2304 0.1uF
VCP NC_7
2 29 20
LNB
C2306 22000pF TCAP BFC
3 19
IC2301
LNB
NC_1 NC_6
4 18
A8290SETTR-T
TDO LNB NC_5
5 17
A_GND
EXTM NC_4
6 16
TDI NC_3
7 15
R2304
4.7K
LNB
A_GND
C2312
C2311
0.1uF
10uF
50V
25V
close to VIN pin(#25)
LNB LNB
DCDC_GND
A_GND
A_GND
R2313
0
LNB_GND
+3.3V_Normal
DCDC_GND
A_GND
Max 1.3A
+12V_LNB
+12V
L2302
BLM18PG121SN1D
LNB
DCDC_GND and A_GND are connected
DCDC_GND and A_GND are connected in pin#27
PCB_GND and A_GND are connected
Input trace widths should be sized to conduct at least 3A
Ouput trace widths should be sized to conduct at least 2A
R2314
0
LNB_GND
A_GND
BCM35230
LNB
2010.11.02
23 57
LGE Internal Use Only